IC CHIP-MOUNTING DEVICE AND IC CHIP-MOUNTING METHOD

Abstract

The present invention is an IC chip mounting apparatus for mounting an IC chip at a reference position of an inlay antenna while conveying the antenna, the IC chip mounting apparatus including: a nozzle configured to suck an IC chip when located at a first position and to place the IC chip at the reference position of the antenna when located at a second position; a nozzle attachment to which the nozzle is attached; an image acquisition unit configured to acquire an image of the IC chip sucked by the nozzle; and a correction amount determination unit configured to determine correction amounts for the IC chip sucked by the nozzle, based on the image acquired by the image acquisition unit. The correction amounts includes a first correction amount for correcting an angle of the nozzle around the axis, a second correction amount for correcting a position of the antenna in a conveying direction of the antenna, and a third correction amount for correcting the position of the antenna in a width direction.

Description

FIELD

The present invention relates to an IC chip mounting apparatus and an IC chip mounting method.

BACKGROUND

With the spread of RFID tags, production of sheet-shaped inlays having an antenna and an IC chip electrically connected to the antenna is increasing. Manufacturing of an inlay involves a process of placing a supplied IC chip on an antenna that is formed on a base material. The IC chip is placed at a predetermined reference position on an antenna, which is a reference for mounting the IC chip. In order to place the IC chip accurately at the reference position on an antenna in the process, it is known to correct a position of the IC chip (for example, Japanese Unexamined Patent Application Publication No. 2008-123406).

Japanese Unexamined Patent Application Publication No. 2008-123406 discloses a mounting apparatus comprised of a stage in which a synchronization roller, which sucks and holds an IC chip, is moved from front to back and from side to side, with respect to a film base plate.

BRIEF SUMMARY

Technical Problem

However, the mounting apparatus disclosed in Japanese Unexamined Patent Application Publication No. 2008-123406 merely moves the synchronization roller from front to back and from side to side (namely, X-axis and Y-axis), and thus the mounting apparatus has a limitation to place an IC chip on the antenna even more accurately.

In view of this, an object of one aspect of the present invention is to improve accuracy in a position on which an IC chip is mounted, when an IC chip is mounted in an inlay manufacturing process.

Solution to Problem

An embodiment of the present invention is an IC chip mounting apparatus for mounting an IC chip at a reference position of an inlay antenna while conveying the antenna, the IC chip mounting apparatus including: a nozzle configured to suck an IC chip when located at a first position and to place the IC chip at the reference position of the antenna when located at a second position; a nozzle attachment to which the nozzle is attached; a first rotating unit configured to rotate the nozzle around an axis; a second rotating unit configured to rotate the nozzle attachment so that the nozzle moves from the first position to the second position; a moving machine configured to move the nozzle; an image acquisition unit configured to acquire an image of the IC chip sucked by the nozzle, when the nozzle is located at a position between the first position and the second position; and a correction amount determination unit configured to determine correction amounts for the IC chip sucked by the nozzle, based on the image acquired by the image acquisition unit. The correction amounts includes: a first correction amount for correcting an angle of the nozzle around the axis, a second correction amount for correcting a position of the antenna in a conveying direction of the antenna, and a third correction amount for correcting the position of the antenna in a width direction. The first rotating unit is configured to rotate the nozzle around the axis based on the first correction amount. The second rotating unit is configured to rotate the nozzle attachment, with an angular velocity adjusted based on the second correction amount. The moving machine is configured to move the nozzle in the width direction orthogonal to the conveying direction of the antenna, based on the third correction amount.

Advantageous Effects

An embodiment of the present invention improves accuracy in a position on which an IC chip is mounted, when an IC chip is mounted in an inlay manufacturing process.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 shows a plane view of an antenna of an embodiment and partially enlarged views of the antenna before and after an IC chip is mounted.

FIG. 2 shows an antenna sheet and a roll of the antenna sheet.

FIG. 3 shows an area corresponding to an IC chip placement process of an IC chip mounting apparatus of an embodiment.

FIG. 4 shows a chip-containing tape and an enlarged sectional view thereof.

FIG. 5 is a side view of a rotary mounter of the IC chip mounting apparatus of the embodiment.

FIG. 6A is a plan view of a nozzle unit included in the rotary mounter.

FIG. 6B is a side view of a nozzle unit included in the rotary mounter.

FIG. 7 schematically illustrates a relation between the rotary mounter and the antenna sheet.

FIG. 8 is a perspective view showing separation of the chip-containing tape by a separation roller.

FIG. 9 illustrates movement of supplying an IC chip to a nozzle unit from the chip-containing tape.

FIG. 10 is a front view of a moving machine in a width direction of the rotary mounter.

FIG. 11 is a functional block diagram of a controller for controlling the rotary mounter.

FIG. 12 shows an example of an image captured by an image capture device.

FIG. 13 shows examples of an IC chip sucked by a nozzle before and after the nozzle is rotated.

FIG. 14 shows an area corresponding to a curing process of the IC chip mounting apparatus of the embodiment.

FIG. 15 shows a part of a press unit and an ultraviolet irradiator as seen from the arrow “J” in FIG. 14.

FIG. 16 shows a method of conveying the antenna sheet of an embodiment.

FIG. 17 illustrates the IC chip placement process of an embodiment.

FIG. 18 illustrates the curing process of an embodiment.

FIG. 19 shows a configuration example of an ultraviolet curing unit in FIG. 18.

FIG. 20 illustrates the curing process of an embodiment.

DETAILED DESCRIPTION

The present invention is related to Japanese Patent Application Nos. 2019-235370 and 2020-216369 respectively filed with the Japan Patent Office on Dec. 26, 2019 and on Dec. 25, 2020, the entire contents of which are incorporated into this specification by reference.

Hereinafter, an IC chip mounting apparatus and an IC chip mounting method according to an embodiment will be described with reference to drawings.

An IC chip mounting apparatus 1 according to the embodiment is an apparatus for mounting an IC chip on a thin film antenna in manufacturing a contactless communication inlay, such as an RFID inlay.

FIG. 1 shows an exemplary antenna AN having a predetermined antenna pattern, but there is no intention to limit the antenna pattern thereto. FIG. 1 also shows enlarged views of an “E” part before and after an IC chip “C” is mounted on the antenna AN. In this example, an IC chip “C” is mounted at a predetermined reference position Pref that is determined in advance based on the antenna pattern. The IC chip “C” has such a very small size as several hundreds of micrometers in length and width dimensions, and this very small IC chip “C” is required to be mounted exactly at the reference position Pref

Mounting the IC chip “C” on the antenna AN involves an IC chip placement process and a curing process. In the IC chip placement process, an adhesive is applied to the reference position Pref of the antenna AN, and the IC chip “C” is placed on the adhesive. In the curing process, the adhesive is cured to strongly connect the antenna AN and the IC chip “C”.

In the IC chip placement process (described later), a roll PR of a strip antenna sheet AS (an example of an antenna continuous body), as shown in FIG. 2, is set. The antenna sheet AS includes a plurality of antennas AN formed on a base material BM with constant pitches. The antenna sheet AS is continuously pulled out of the roll PR and is provided to a line of the IC chip placement process.

Examples of the material that can be used for the base material BM include, but not specifically limited to, paper base materials such as fine paper, coated paper, and art paper, synthetic resin films made of polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), or polystyrene (PS), sheets made of a plurality of these synthetic resins, and composite sheets of a synthetic resin film and paper.

The antenna AN is formed, for example, by attaching a metal foil to a base material BM or by screen-printing or vapor-depositing a conductive material into a predetermined pattern on a base material BM.

In the following description, an XYZ coordinate system is defined as shown in FIG. 2. The following describes a front view as a YZ-plane view, a plane view as an XY-plane view, and a side view as an XZ-plane view in referring to the drawings of components set in each process.

The X-direction is a direction of conveying the antenna sheet AS, which is pulled out of the roll PR, in each process described below, and it is also called a “conveying direction D1” as appropriate. In addition, the Y-direction is a width direction of the antenna sheet AS and is also called a “width direction D2” as appropriate. The Z-direction is a direction orthogonal to the antenna sheet AS.

(1) IC Chip Placement Process

Hereinafter, the IC chip placement process will be described with reference to FIGS. 3 to 10. FIG. 3 shows an area corresponding to the IC chip placement process of the IC chip mounting apparatus 1 of this embodiment. FIG. 4 shows a plane view of a chip-containing tape CT and an enlarged view of an A-A section thereof.

In the IC chip placement process, the IC chip mounting apparatus 1 accurately places a very small IC chip at the reference position Pref (refer to FIG. 1) of each antenna AN on the antenna sheet AS.

As shown in FIG. 3, the IC chip mounting apparatus 1 includes a conveyor 81, a dispenser 2, a rotary mounter 3, an ultraviolet irradiator 41, image capture devices CA1 to CA3, a tape feeder 71, a tape body winding reel 72, a film winding reel 73, and a separation roller 74, in the IC chip placement process.

The conveyor 81 (an example of a conveyor) conveys the antenna sheet AS that is pulled out of the roll PR (refer to FIG. 2) to the downstream of the process at a predetermined conveying speed. An upper surface of the conveyor 81 corresponds to a conveying surface.

The dispenser 2 ejects a fixed amount of anisotropic conductive paste (ACP; hereinafter simply called “conductive paste”) to the reference position Pref of each antenna AN that is conveyed. This conductive paste is an example of an ultraviolet light curable adhesive. The dispenser 2 is configured so that the ejection position can be adjusted in the width direction, in order to accurately determine the ejection position relative to the reference position Pref of each antenna AN.

The image capture device CA1 is provided upstream of the dispenser 2 and captures an image of a part in the vicinity of the reference position Pref of each antenna AN, in order to determine the position to be applied with the conductive paste. The image capture device CA2 is provided downstream of the dispenser 2 and captures an image of a part in the vicinity of the reference position Pref of each antenna AN, in order to inspect whether the conductive paste is applied to each antenna AN and to inspect whether the conductive paste is applied exactly to a region including the reference position Pref.

The rotary mounter 3 is a chip mounter that places an IC chip on the conductive paste that is applied to each antenna AN, and it rotates in a counterclockwise direction in FIG. 3. The rotary mounter 3 is mounted to and suspended by a suspension plate 86. The suspension plate 86 is supported by a support stand 85, while movable in the Y-direction. Thereby, the rotary mounter 3 is suspended from above by the support stand 85, and moveable in the Y-direction.

As described later, the rotary mounter 3 sucks an IC chip from the chip-containing tape and places (mounts) the sucked IC chip by releasing it to the reference position Pref of each antenna AN on the antenna sheet AS. Meanwhile, in order to place the IC chip exactly at the reference position Pref of the antenna AN, the position and the direction of the sucked IC chip are corrected. The image capture device CA3 images the IC chip in the state of being sucked by a nozzle (described later), in order to perform a correction process of correcting the position and the direction of the IC chip in preparation for mounting it on the antenna AN.

The tape feeder 71 is configured to be loaded with a wound chip-containing tape that contains IC chips and to cause the chip-containing tape to be pulled out sequentially at a speed synchronized with the rotary mounter 3, in the arrow directions in FIG. 3.

Herein, an example of the chip-containing tape will be described with reference to FIG. 4.

As shown in FIG. 4, the chip-containing tape CT includes a tape body “T” and a cover film CF. Recesses Td for containing IC chips “C” are formed at fixed intervals in the tape body “T”. The cover film CF is attached to the tape body “T” so as to cover the recesses Td. The recesses Td are formed, for example, by embossing the tape body “T”. The IC chip “C” is contained in each recess Td along the extending direction of the chip-containing tape CT. The chip-containing tape CT has fitting holes H that are formed at fixed intervals in the extending direction. These fitting holes H are provided in order to accurately perform positioning relative to a circumferential surface of the separation roller 74. The fitting holes H are fitted to protrusions 74p (described later), which are provided to the separation roller 74, while the chip-containing tape CT is conveyed by the separation roller 74.

As shown in FIG. 4, a suction hole Ts is formed between a bottom surface of the recess Td and a back surface (surface on a side opposite to the surface attached with the cover film CF) of the tape body “T”. The suction hole Ts is provided so as to make the separation roller 74 suck an IC chip “C”, in order to prevent the IC chip “C” from falling out of the recess Td when the cover film CF is peeled off.

With reference to FIG. 3 again, the chip-containing tape CT is fed from the tape feeder 71 via one or a plurality of auxiliary rollers, and the cover film CF is peeled off from the chip-containing tape CT to be separated from the tape body “T” at the separation roller 74. The IC chip “C” is exposed upon peeling off the cover film CF and is sequentially sucked by each nozzle that is provided to the rotary mounter 3.

After the chip-containing tape CT is separated into the tape body “T” and the cover film CF by the separation roller 74, the tape body “T” is wound by the tape body winding reel 72 via one or a plurality of auxiliary rollers, whereas the cover film CF is wound by the film winding reel 73 via one or a plurality of auxiliary rollers.

Next, the rotary mounter 3 will be described with reference to FIGS. 5 to 7.

FIG. 5 is a side view of the rotary mounter 3 of the IC chip mounting apparatus 1 of this embodiment. FIG. 6A is a plane view of a nozzle unit mounted on the rotary mounter 3. FIG. 6B is a side view of nozzle units 30. FIG. 7 schematically illustrates a relation between the rotary mounter 3 and the antenna sheet AS.

As shown in FIG. 5, a plurality of nozzle units (twelve units in the example of the drawing) 30-1 to 30-12 are arranged radially from a rotary head 3H (an example of a nozzle attachment) in the rotary mounter 3. The following collectively describes the nozzle units 30-1 to 30-12 as “nozzle units 30” when referring to matters that are common therebetween.

Although not illustrated in detail, the rotary head 3H is connected to a rotary drive motor, a vacuum pump, and a blower. The rotary drive motor rotates the nozzle units 30-1 to 30-12 in a counterclockwise direction in FIG. 5. The vacuum pump causes the nozzle unit 30 to suck an IC chip. The blower causes the nozzle unit 30 to release the IC chip.

Referring to FIG. 6, provided are a nozzle 32, a sleeve 33, a solenoid valve 35, and a cylinder drive motor M30. The nozzle 32 is provided at a tip of the nozzle unit 30 and connected to the cylinder drive motor M30 in the sleeve 33. The cylinder drive motor M30 (an example of a first rotating unit) is a motor (e.g., a stepping motor) that rotates the nozzle 32 around an axis thereof. A path that can be communicated with an suction tube 36 and an exhaust tube 37 is formed in the nozzle 32.

The suction tube 36 and the exhaust tube 37 are coupled with the sleeve 33. The suction tube 36 is connected to a vacuum pump (not illustrated), while the exhaust tube 37 is connected to a blower (not illustrated).

The solenoid valve 35 may be a three-port valve, for example, that is configured to, in response to current-applying condition, either open a path between a path 34 of the nozzle 32 and the suction tube 36, thereby closing the exhaust tube 37, or open a path between the path 34 of the nozzle 32 and the exhaust tube 37, thereby closing the suction tube 36. The solenoid valve 35 is configured to perform either a suction operation for sucking by the nozzle 32 through the suction tube 36, or an exhaust operation for exhausting air from the nozzle 32 through the exhaust tube 37.

Referring to FIG. 7, the rotary head 3H is rotated by a rotation drive motor (not illustrated). Thereby, a circumferential positon of each nozzle unit in the rotary head 3H is sequentially changed. That is, a nozzle unit 30 moves on a surface orthogonal to the conveying surface along a circular track, in response to rotation of the rotary head 3H, and as such, the nozzle unit 30 is sequentially located at each of twelve circumferential positions PA to PL in the rotary head 3H. The positions PA to PL are arranged from the position PA to the position PL in a counter-clockwise direction.

Herein, the position PA (an example of a first position) is a position where the nozzle unit 30 sucks a new IC chip “C” from the chip-containing tape CT. The position PE is a position where the image capture device CA3 images the IC chip “C” in the state of being sucked by the nozzle of the nozzle unit 30.

The position PK (an example of a second position) is a position where the sucked IC chip “C” is released on the conductive paste applied to the antenna AN of the antenna sheet AS that is conveyed. The moving direction of the top of the nozzle matches the conveying direction D1 of the antenna sheet AS at the position PK. The nozzle unit 30 discharges air from the nozzle to release the IC chip “C” at the position PK.

The nozzle unit 30 does not suck the IC chip “C” at the position PL, as it has released the IC chip “C” at the position PK. In order to remove dust that may adhere to the nozzle, air may be jetted out from the nozzle at the position PL. FIG. 6 shows an example of disposing a dust collection tray TR for collecting dust that may be detached from the nozzle, at the position PL.

In an example, the following movement is repeated. In FIG. 7, the nozzle unit 30-1 at the position PA sucks a new IC chip “C” thereat and rotates in the counterclockwise direction while sucking the IC chip “C”, and it then releases the IC chip “C” upon reaching the position PK and returns to the position PA to suck a new IC chip “C” again. Such an IC chip mounting method enables continuously placing the IC chip on each antenna AN without stopping conveyance of the antenna sheet AS, resulting in high productivity.

The angular velocity of the rotary head 3H and the conveying speed of the antenna sheet AS are set or controlled so that the nozzle unit 30, which sequentially reaches the position PK, will release the IC chip “C” to the reference position Pref of each antenna AN of the antenna sheet AS, which is conveyed from the upstream side. In order to accurately place the IC chip “C”, it is preferable to provide a section where the speed of the top of the nozzle unit 30 is equal to the conveying speed of the antenna sheet AS, in proximity to the position PK.

Note that this embodiment shows an example of arranging twelve nozzle units 30 to the rotary head 3H, but the number of the nozzle units 30 is not limited thereto. The number of the nozzle units 30 that are arranged to the rotary head 3H can be set to any number.

Next, movement of the nozzle unit 30 sucking the IC chip “C” will be described with reference to FIGS. 8 and 9.

FIG. 8 is a perspective view showing separation of the chip-containing tape CT by the separation roller 74. FIG. 9 is a side view of the vicinity of the separation roller 74, illustrating movement of supplying the IC chip “C” to the nozzle unit 30 from the chip-containing tape CT. In order to show the state of the chip-containing tape CT, only the chip-containing tape CT is illustrated in cross-section in FIG. 9.

As shown in FIG. 8, the chip-containing tape CT, which is supplied from the tape feeder 71, is conveyed while its position in the width direction is determined by inserting the protrusions 74p of the separation roller 74 into the fitting holes H of the chip-containing tape CT. At this time, the cover film CF is peeled off from the chip-containing tape CT by a split member 75 and is sent to the film winding reel 73. On the other hand, the tape body “T” of the chip-containing tape CT is sent to the tape body winding reel 72.

As shown in FIG. 9, the IC chip “C” that is exposed due to peeling off of the cover film CF is immediately sucked by the nozzle unit 30. The separation roller 74 is provided with a suction path (not shown) for sucking the IC chip “C” toward the rotation center of the separation roller 74, so that the IC chip “C” will not fall out during a short period from a time when the IC chip “C” is exposed until it is sucked by the nozzle unit 30. The IC chip “C” is sucked through this suction path and the suction hole Ts (refer to FIG. 4) provided to the tape body “T”.

A moving machine 8 will be now described with reference to FIG. 10. The moving machine 8 is configured to move the rotary head 3H in the width direction D2. FIG. 10 is a front view of the moving machine 8.

The moving machine 8 is provided to be able to correct a position of the IC chip “C”, which has been sucked by the nozzle unit 30, in the width direction D2. As illustrated in FIG. 10, the moving machine 8 is comprised of a bearing 76, a shaft 77, a suspension plate 86, a guide plate 87, a slider 88, and a width-direction drive motor M32.

The bearing 76, the shaft 77, and the width-direction drive motor M32 are provided on the support stand 85. The shaft 77 is a bar-shaped member having a threaded part, and rotationally driven by the width-direction drive motor M32. The shaft 77 is rotatably supported by the bearings 76 (at two locations) fixed on an upper surface of the support stand 85.

The rotary head 3H is attached to the suspension plate 86. A threaded hole (not illustrated) is formed at a top edge portion of the suspension plate 86. The hole is fit to the threaded part of the shaft 77. Thus, in response to rotation of the shaft 7, the suspension plate 86 and the rotary head 3H, which is attached to the suspension plate 86, are movable in the width direction D2. An upper portion of the support stand 85 and the guide plate 87 include hollow parts formed in a movable range of the suspension plate 86 in the width direction D2. The slider 88 is attached to the suspension plate 86, and slides on an upper surface of the guide plate 87, in accordance with movement of the suspension plate 86 in the width direction D2.

With the arrangement described above, the moving machine 8 enables the rotary head 3H to move in the width direction D2, in response to rotational drive by the width-direction drive motor M32.

In the present embodiment, the moving machine 8 moves the rotary head 3H in the width direction D2, thereby moving the nozzle unit 30 attached to the rotary head 3H in the width direction D2; however, other moving machine may be applied. For example, a moving machine may be applied that is able to individually translate, in the width direction D2, each nozzle unit 30 of the rotary head internally, without the rotary head moved in the width direction D2.

With reference to FIG. 3 again, the ultraviolet irradiator 41 is provided in the vicinity of the position (position PK in FIG. 7) where the IC chip is released to the antenna AN from the nozzle unit 30 of the rotary mounter 3.

The ultraviolet irradiator 41 emits ultraviolet light to the conductive paste on the antenna AN that is conveyed. The purpose of emission of ultraviolet light by the ultraviolet irradiator 41 is to adjust viscosity of the conductive paste on the antenna AN, which is different from the purpose of emission of ultraviolet light performed in a curing process (described later) following the IC chip placement process. From this point of view, an integrated light amount of ultraviolet light applied to the conductive paste by the ultraviolet irradiator 41 is preferably less than that of ultraviolet light applied to the conductive paste in the subsequent curing process. An integrated light amount of ultraviolet light is represented by a product of light intensity and irradiation time duration. Thus, adjustment of either light intensity or irradiation time duration enables adjustment of the integrated light amount.

In the IC chip mounting apparatus 1 of the present embodiment, the dispenser 2 may apply a thermosetting adhesive such as epoxy resin to the antenna AN, and a thermosetting machine may be applied in replacement of the ultraviolet irradiator 41.

In FIG. 3, the ultraviolet irradiator 41 is disposed to irradiate the adhesive with ultraviolet light after the IC chip has been located; however, other irradiation methods may be applied. For example, the ultraviolet irradiator 41 may be disposed so as to irradiate the adhesive with ultraviolet light before the IC chip is located, and may be disposed so as to irradiate the adhesive with ultraviolet light concurrently with the IC chip being located.

In case in which the adhesive is irradiated with ultraviolet light after the IC chip has been located, the IC chip is unlikely to shift or tilt after the IC chip has been located, as viscosity of the conductive paste decreases. In case in which the adhesive is irradiated with ultraviolet light before the IC chip is located or concurrently with the IC chip being located, the IC chip is located on the conductive paste with low viscosity. As the IC chip is unlikely to move after having been located on the conductive paste, the IC chip is unlikely to shift or tilt.

In any case, irradiation of ultraviolet light in the vicinity of a place where the IC chip is located, prevents a situation that the IC chip is unstable on the conductive paste due to viscosity of the conductive paste. That is, irradiation of the ultraviolet irradiator 41 has advantage that mounting accuracy of the IC chip is improved.

Next, a control of a control unit 100 for controlling the rotary mounter 3 will be described with reference to FIGS. 11 to 13. FIG. 11 is a functional block diagram of the control unit 100. FIG. 12 illustrates an exemplary image captured by the image capture device CA1. FIG. 13 illustrates exemplary IC chips sucked by the nozzle 32 before and after the nozzle 32 is rotated. FIG. 13 shows an exemplary image captured by the image capture device CA3 in a condition before the nozzle 32 is rotated. FIG. 13, in a condition after the nozzle 32 is rotated, includes an XYZ-axis when the nozzle is at the position PK (see FIG. 7).

The control unit 100 is implemented on a circuit board (not illustrated), and connected to the image capture devices CA1 to CA3, the dispenser 2, the cylinder drive motor M30, a rotational drive motor M31, the width-direction drive motor M32, the solenoid valve 35, and the ultraviolet irradiator 41. The rotational drive motor M31 (an example of a second rotating unit) is a drive means for rotating the nozzle units 30-1 to 30-12 in the nozzle head 3H.

The control unit 100 is comprised of a microcomputer, memories (a random access memory (RAM) and a read only memory (ROM)), a storage, and drive circuits. The microcomputer reads out a program stored in the memory to function as each of an ejection position adjusting unit 101, an IC chip correction unit 102, a valve control unit 103, and a curing unit 104.

The ejection position adjusting unit 101 includes a function for determining an ejection position of the conductive paste based on an image captured by the image capture device CA1, and for adjusting an ejection time when the conductive paste is ejected and a positon of the dispenser 2 in the width direction D2. A determination method of a positon where the conductive paste is ejected, will be described with reference to FIG. 12.

As exemplified by FIG. 12, an image captured by the image capture device CA1 is one in the vicinity of the reference position Pref of the antenna AN.

The ejection position adjusting unit 101 identifies the reference position Pref from geometric characters in the image. More specifically, the ejection position adjusting unit 101 analyzes a shape of the antenna AN in the image of FIG. 12 to determine reference lines L1, L2 parallel to each other in the X-direction and reference lines L3, L4 parallel to each other in the Y-direction. The ejection position adjusting unit 101 then identifies the reference position Pref as an intersecting point between a centerline of the reference lines L1, L2 and a centerline of the reference lines L3, L4.

A point Pj 1 in the image of FIG. 12, which is a target position for the reference position Pref in the image, is predetermined based on a result of calibration performed with an image captured by the image capture device CA1 and a drop position of the conductive paste by the dispenser 2. That is, an ejection time of the dispenser 2 and a positon of the dispenser 2 in the width direction D2 are adjusted so that the reference position Pref identified in the image matches the target position Pj 1, which allows the conductive paste to be applied on the actual reference position of the antenna AN.

In the example of FIG. 12, the reference position Pref identified in the image needs to be adjusted by “x1” in the X-direction and by y1 in the Y-direction, in order to match the target position Pj 1. Specifically, an ejection time of the dispenser 2 is determined based on “x1” in consideration of speed for conveying the antenna AN, and the dispenser 2 is translated based on y1 in the width direction D2. That is, the ejection position adjusting unit 101 transmits a control signal to the dispenser 2 for instructing the an ejection time and translational displacement in the width direction D2, and the dispenser 2 then perform an ejection operation based on the control signal.

An image captured by the image capture device CA2 is similar to one in FIG. 12, except that the conductive paste is applied.

The IC chip correction unit 102 includes a function for correcting a position of the IC chip sucked by the nozzle 32. The correction method of the position of the IC chip will be described with reference to FIGS. 12 and 13.

As illustrated in FIG. 13 in a condition before the nozzle 32 is rotated, the image captured by the image capture device CA3 (an example of an image acquisition unit) includes a nozzle end 32e and an IC chip sucked by the nozzle end 32e. A point Pc1 is a central position of the IC chip before the nozzle is rotated. A Pj2 in the image of FIG. 13 is a target position for the central position of the IC chip. The Pj2 is set so as to match the target position Pj 1 in FIG. 12. That is, the central position of the IC chip is caused to match the target position Pj 1, which allows the IC chip “C” to be placed at the reference position of the antenna AN that is actually conveyed.

A rotational center Prc around the axis of the nozzle 32 is unlikely to be a theoretical axial center of each nozzle due to attachment variation etc. of the nozzle units 30-1 to 30-12. The rotational center Prc may be different for each nozzle unit, and is determined based on measurement data which is obtained beforehand.

First, the central position Pci of the IC chip “C” in the image is rotated about the rotational center Prc of the nozzle 32, and a rotation amount is then determined when a reference line of the IC chip “C” (for example, a reference side Sc of the IC chip “C” in FIG. 13) becomes parallel to the Y-direction.

In the example of FIG. 13 in a condition after the nozzle 32 is rotated, the IC chip “C” in the captured image is rotated about the rotational center Prc so that the reference side Sc of the IC chip “C” becomes parallel to the Y-direction. A rotation angle is then determined as a correction amount in a rotational direction of the IC chip “C” (an example of a first correction amount). Here, a central position of the IC chip “C” after being moved is defined as a point Pc2. Then, “x2” and “x3” are determined so that the point Pc2 matches the target position Pj2. “x2” is a correction amount x2 in the X-direction (an example of a second correction amount). “x3” is a correction amount y2 in the Y-direction (an example of a third correction amount).

The IC chip correction unit 102 transmits a control signal to the cylinder drive motor M30. The control signal corresponds to the correction amount in the rotational direction about the axis of the nozzle 32. The nozzle 32 is then rotated about the axis thereof, while moved from the position PE where the image of the nozzle 32 is captured by the image capture device CA3, to the position PK where the IC chip is released.

The IC chip correction unit 102 transmits a control signal to the rotational drive motor M31. The control signal corresponds to the correction amount x2 in the X-direction. An angular velocity of the rotary head 3H is then adjusted. The IC chip correction unit 102 transmits a control signal to the width-direction drive motor M32. The control signal corresponds to the correction amount y2 in the Y-direction. A position of the rotary head 3H in the width direction D2 is then adjusted. As the position of the rotary head 3H in the width direction D2 is adjusted, the position of the nozzle 32 in the width direction D2 is also adjusted.

In the IC chip mounting apparatus 1 of the present embodiment, the IC chip correction unit 102 performs corrections for positions of the IC chip in the X-direction, the Y-direction, and orientation of the IC chip in a plane orthogonal to the axis of the nozzle. Thereby, the IC chip mounting apparatus 1 exerts a beneficial effect that mounting accuracy of the IC chip to the antenna is very high.

The valve control unit 103 controls each solenoid valve 35 of the twelve nozzle units 30-1 to 30-12 of the rotary mounter 3, so that each nozzle unit 30 either sucks or discharges air, depending on a position of each nozzle unit 30. More specifically, the valve control unit 103 controls the solenoid valve 35, so that the nozzle unit 30 sucks when located at any position of the positions PA to PJ (see FIG. 7) while the nozzle unit 30 discharges air when located at the position PK or the position PL.

The curing unit 104 transmits a drive signal to the ultraviolet irradiator 41, so that the ultraviolet irradiator 41 emits ultraviolet light to each antenna AN that is conveyed, with predetermined integrated light amount.

(2) Curing Process

Next, the curing process will be described with reference to FIGS. 14 and 15.

The curing process involves curing the conductive paste, which is applied to each antenna and undergoes the IC chip placement process, whereby the physical connection between the antenna and the IC chip is strengthened, and the electrical conduction between the antenna and the IC chip is reliably made.

FIG. 14 shows an area corresponding to the curing process of the IC chip mounting apparatus 1 of this embodiment. FIG. 15 shows a part of a press unit 6 and ultraviolet irradiators 42 as seen from the arrow “J” in FIG. 14.

As shown in FIG. 14, the IC chip mounting apparatus 1 includes a conveyor 82, a curing device 4, and an image capture device CA4, in the curing process.

The conveyor 82 conveys the antenna sheet AS that is conveyed from the upstream IC chip placement process to a downstream side at a predetermined conveying speed.

The image capture device CA4 is disposed above the antenna sheet AS on the most upstream of the curing process (that is, the most downstream of the IC chip placement process) and captures an image of each antenna AN that is conveyed from the IC chip placement process. The image capture device CA4 is provided in order to inspect whether the IC chip is placed at an appropriate position in the IC chip placement process.

As illustrated in FIG. 14, the curing machine 4 is comprised of one or plural press units 6 and an ultraviolet irradiator 42.

The press unit 6 rises or falls in a direction orthogonal to the conveying surface. The press unit 6 presses the IC chip located on the conductive paste on the antenna AN, while each antenna AN is irradiated with ultraviolet light. A quantity of the press unit 6 is not limited, and may be determined from aspects of productivity and cost.

The ultraviolet irradiator 42 is disposed along the conveying direction D1. Thus, the ultraviolet irradiator 42 is also able to emit ultraviolet light simultaneously to the multiple antennas AN on the antenna sheet AS.

Referring to FIG. 15, it is shown that the ultraviolet irradiator 42 irradiates each antenna AN with ultraviolet light. As illustrated in FIG. 15, the press unit 6 has a shaft 63, a tip of which is attached to a pressing part 61. A lateral face of the pressing part 61 of the press unit 6 (that is, a face in the side on which the ultraviolet irradiator 42 is disposed) is open. A glass plate 61p, which is a pressing surface of the pressing part 61, is made of glass through which ultraviolet light passes.

The ultraviolet irradiator 42 has a light source 42e such as a light emitting diode (LED). The light source 42e is configured to emit ultraviolet light to the antenna AN from a direction slanted off the conveying surface.

Ultraviolet light irradiation is performed while the IC chip on the conductive paste, which is applied to each antenna AN, is pressed. Thereby, the conductive paste is cured to strengthen physical connection between the antenna and the IC chip, and electrical connection between the antenna and the IC chip is ensured.

As aforementioned, a belt-shaped antenna sheet is on a manufacturing line. The belt-shaped antenna sheet has plural antennas, each of which is formed on a base material with a constant pitch. The IC chip is mounted on each antenna through the IC chip placement process and the curing process. The IC chip mounting apparatus 1 of the present embodiment applies an adhesive to the reference position of the antenna and places an IC chip on the adhesive in the IC chip placement process. The IC chip mounting apparatus 1 then cures the adhesive in the curing process to strengthen connection between the antenna and the IC chip. In the present embodiment particularly, corrections are performed in the IC chip placement process, with respect to positions of the IC chip in the X-direction, the Y-direction, and orientation of the IC chip in the plane orthogonal to the axis of the nozzle that sucks the IC chip. Therefore, mounting accuracy of the IC chip in mounting the IC chip to the antenna can be improved.

Although an embodiment of the IC chip mounting apparatus and the IC chip mounting method is described above, the present invention should not be limited to the foregoing embodiment. In addition, the embodiment described above may be variously modified and altered within the scope not departing from the gist of the present invention.

In an example, although the antenna sheet AS is conveyed on the conveyor 81 in one direction in the IC chip placement process in the embodiment shown in FIG. 3, the conveying method is not limited thereto.

In an embodiment, as shown in FIG. 16, the antenna sheet AS may be conveyed by suction drums 92 and 94 and a plurality of conveying rollers (e.g., conveying rollers 91, 93, and 95 in FIG. 17) in the IC chip placement process. In FIG. 16, the dispenser 2 ejects the conductive paste to the reference position of the antenna AN of the antenna sheet AS, at the highest position of the suction drum 92. In addition, the IC chip is placed on the conductive paste at the highest position of the suction drum 94. In this case, at least the suction drums 92 and 94 are preferably suction rollers that suck the back surface of the antenna sheet AS. This structure prevents dislocation of the antenna sheet AS (in particular, in the longitudinal direction), whereby ejection of the conductive paste as well as placement of the IC chip is performed with high accuracy.

In an embodiment, instead of releasing the IC chip on the conductive paste applied to the antenna AN on the conveyed antenna sheet AS, the IC chip may be placed by pressing it to the conductive paste.

FIG. 17 shows movement of the rotary mounter 3 in time series in the case of placing the IC chip by pressing it to the conductive paste. In an embodiment, nozzle units 30 of the rotary mounter 3 are configured to move in respective radial directions (diameter directions) by a built-in drive device.

The state ST1 is a state in which the nozzle unit 30 sucks the IC chip “C”. Placement of the sucked IC chip “C” is performed in the state ST2. That is, the nozzle unit 30 is moved toward the reference position (that is, in the lower direction which is the Z-direction in FIG. 2) in such a manner as to extend in the radial direction (diameter direction). The IC chip “C” is then placed on the conductive paste by pressing it to the conductive paste applied to the antenna AN. After the IC chip “C” is placed, the suction is released, and the nozzle unit 30 is returned to the position in the state ST1. For example, the movement from the state ST1 to the state ST3 is performed at the time the nozzle unit 30 reaches the position PK (refer to FIG. 7), whereby the IC chip “C” is placed on the conductive paste applied on the antenna AN.

A curing process of an embodiment is shown in FIG. 18. FIG. 18 shows a curing device 4A that is used in the curing process of an embodiment. The curing device 4A includes a plurality of ultraviolet curing units 43 that are detachably mounted to a mounting board 44. A plurality of mounting boards 44 that have different mounting positions are prepared in accordance with the interval of adjacent antennas AN of the antenna sheet AS. Under these conditions, the mounting boards 44 are switched in response to the interval, whereby various antenna sheets AS can be used in the curing device 4A.

A support shaft 45 supports and moves the mounting board 44 up and down. The antenna sheet AS that is conveyed from the IC chip placement process is sent to the curing process via conveying rollers 96 to 98. The conveying roller 97 is moved up and down by a drive device (not shown).

An example of the structure of the ultraviolet curing unit 43 is shown in FIG. 19. As shown in FIG. 19, the ultraviolet curing unit 43 contains a light source 432 (e.g., an LED light source) for emitting ultraviolet light, in a housing 431. The light source 432 is powered via a cable 436 (not shown in FIG. 18) that is provided from the outside of the ultraviolet curing unit 43. A condensing lens for condensing ultraviolet light that is emitted by the light source 432 may be provided in the housing 431. A holding plate 434 is coupled to the housing 431 and holds a glass plate 435. The ultraviolet light that is emitted from the light source 432 illuminates and cures the conductive paste applied to each antenna AN.

With reference to FIG. 18 again, the conveying state is a state in which the antenna sheet AS is conveyed from the IC chip placement process. The conveyance of the antenna sheet AS is stopped at the time the antennas AN applied with uncured conductive paste come immediately under the ultraviolet curing units 43. Then, in the state (resting state) in which the conveyance of the antenna sheet AS is rested, the ultraviolet curing units 43 are lowered, and they emit ultraviolet light to cure the conductive paste while pressing the antennas AN with the glass plates 435.

The antenna sheet AS is conveyed from the IC chip placement process during the resting state, and therefore, the conveying roller 97 is lowered by its own weight and absorbs the conveyed antenna sheet AS between the conveying rollers 96 and 98 while ultraviolet light is emitted. After emission of ultraviolet light is finished, the antennas AN, number of which corresponds to the number of the ultraviolet curing units 43, are quickly conveyed to a downstream side, and instead, uncured antennas AN are then stopped at the positions immediately under the ultraviolet curing units 43. That is, in the curing process of an embodiment, the conveying state and the resting state (ultraviolet light emission state) of the antenna sheet AS are repeated. In quickly conveying the antennas AN, the conveying roller 97 is raised by tension applied to the antenna sheet AS.

The curing process of an embodiment may use a thermosetting device. That is, in the case of applying a thermosetting adhesive, such as an epoxy resin, by the dispenser 2, the adhesive is cured by a thermosetting treatment in the curing process.

FIG. 20 shows a curing device 4B configured so that the conveying state and the resting state of the antenna sheet AS will be repeated as in the case in FIG. 18. The curing device 4B is different from the curing device 4A in having a plurality of thermosetting units 46. A heat source that is operated by power supplied via a cable (not shown) is disposed to each thermosetting unit 46. While the antenna sheet AS is in the resting state, the support shaft 45 is driven so as to move down, and each thermosetting unit 46 heats and cures the adhesive while pressing the corresponding antenna AN. After heating is completed, the support shaft 45 is driven so as to move up, and the antenna sheet AS is conveyed.

In the case of curing the conductive paste with ultraviolet light in FIG. 18, instead of the ultraviolet curing unit 43 containing the light source, a press unit for pressing the antenna AN via a glass plate may be used. In addition, an ultraviolet irradiator may also be provided in such a manner as to emit ultraviolet light from an outside in the width direction or an oblique upper side to the conductive paste on the antenna AN that is pressed in the resting state.

In an embodiment, in order to not make the antenna sheet AS in the resting state during emission of ultraviolet light, the plurality of the ultraviolet curing units 43 may be circulated in a manner linked to the advance speed of the antenna sheet AS, and ultraviolet light may be emitted by the internal light source while the antenna AN is pressed.

Similarly, in an embodiment, in thermally curing the conductive paste, the plurality of the thermosetting units 46 may be circulated in a manner linked to the advance speed of the antenna sheet AS, and the antenna AN may be heated while being pressed.

Claims

1. An IC chip mounting apparatus for mounting an IC chip at a reference position of an inlay antenna while conveying the antenna, the IC chip mounting apparatus comprising: a nozzle configured to suck an IC chip when located at a first position and to place the IC chip at the reference position of the antenna when located at a second position;a nozzle attachment to which the nozzle is attached;a first rotating unit configured to rotate the nozzle around an axis;a second rotating unit configured to rotate the nozzle attachment so that the nozzle moves from the first position to the second position;a moving machine configured to move the nozzle;an image acquisition unit configured to acquire an image of the IC chip sucked by the nozzle, when the nozzle is located at a position between the first position and the second position; anda processor configured to determine correction amounts for the IC chip sucked by the nozzle, based on the image acquired by the image acquisition unit, the correction amounts including a first correction amount for correcting an angle of the nozzle around the axis,a second correction amount for correcting a position of the antenna in a conveying direction of the antenna, anda third correction amount for correcting the position of the antenna in a width direction,wherein the first rotating unit is configured to rotate the nozzle around the axis based on the first correction amount,wherein the second rotating unit is configured to rotate the nozzle attachment, with an angular velocity adjusted based on the second correction amount, andwherein the moving machine is configured to move the nozzle in the width direction orthogonal to the conveying direction of the antenna, based on the third correction amount.

2. The IC chip mounting apparatus according to claim 1, further comprising a conveyor configured to convey an antenna continuous body on which a plurality of the antennas are continuously formed, on a conveying surface, wherein the second rotating unit is configured to rotate the nozzle attachment, such that the nozzle moves, on a surface orthogonal to the conveying surface, along a circular track, and a moving direction of the nozzle at the second position matches the conveying direction of the antenna continuous body.

3. The IC chip mounting apparatus according to claim 1, wherein a plurality of the nozzle is attached to the nozzle attachment, andwherein the second rotating unit rotates the nozzle attachment, whereby each nozzle sequentially moves from the first position to the second position to place the IC chip at the reference position of each antenna of the antenna continuous body.

4. The IC chip mounting apparatus according to claim 1, wherein a plurality of the nozzle is attached to the nozzle attachment,wherein the processor is configured to determine the correction amount for each nozzle, andwherein the first rotating unit is configured to rotate each nozzle around the corresponding axis based on the first correction amount determined for the corresponding nozzle.

5. The IC chip mounting apparatus according to claim 1, wherein the moving machine is configured to move the nozzle attachment in the width direction, thereby moving the nozzle in the width direction.

6. The IC chip mounting apparatus according to claim 1, wherein the nozzle attachment is suspended by a support stand.

7. The IC chip mounting apparatus according to claim 1, wherein the nozzle is configured to release the IC chip toward the reference position of the antenna to place the IC chip thereon.

8. The IC chip mounting apparatus according to claim 1, wherein the moving machine is configured to move the nozzle while the nozzle sucks the IC chip, to place the nozzle close to the antenna, andwherein the processor is further configured to control the nozzle to stop sucking the IC chip when the nozzle is at the reference position, thereby placing the IC chip at the reference position of the antenna.

9. An IC chip mounting method for mounting an IC chip at a reference position of an inlay antenna while conveying the antenna, the IC chip mounting method comprising: sucking, by a nozzle, an IC chip when the nozzle located at a first position, the nozzle being attached to a nozzle attachment;rotating the nozzle attachment so that the nozzle moves from the first position to a second position;acquiring an image of the IC chip sucked by the nozzle, when the nozzle is located at a position between the first position and the second position;determining correction amounts for the IC chip sucked by the nozzle, based on the acquired image, the correction amounts includinga first correction amount for correcting an angle of the nozzle around an axis,a second correction amount for correcting a position of the antenna in a conveying direction of the antenna, anda third correction amount for correcting the position of the antenna in a width direction orthogonal to the conveying direction,rotating the nozzle around the axis based on the first correction amount;rotating the nozzle attachment, with an angular velocity adjusted based on the second correction amount;moving the nozzle in the width direction based on the third correction amount;placing the IC chip sucked by the nozzle, at the reference position of the antenna, when the nozzle is located at the second position.

10. The IC chip mounting method according to claim 9, further comprising: conveying an antenna continuous body on which a plurality of the antennas are continuously formed, on a conveying surface, androtating the nozzle attachment, such that the nozzle moves, on a surface orthogonal to the conveying surface, along a circular track, and a moving direction of the nozzle at the second position matches the conveying direction of the antenna continuous body.

11. The IC chip mounting method according to claim 9, wherein a plurality of the nozzle is attached to the nozzle attachment, the method further comprising: rotating the nozzle attachment, whereby each nozzle sequentially moves from the first position to the second position; andplacing the IC chip at the reference position of each antenna of the antenna continuous body.

12. The IC chip mounting method according to claim 9, wherein a plurality of the nozzle is attached to the nozzle attachment, the method further comprising:determining the correction amount for each nozzle; androtating each nozzle around the corresponding axis based on the first correction amount determined for the corresponding nozzle.

13. The IC chip mounting method according to claim 9, wherein the moving the nozzle in the width direction is performed by moving the nozzle attachment in the width direction.

14. The IC chip mounting method according to claim 9, wherein the placing the IC chip at the reference position of the antenna is performed by the nozzle releasing the IC chip toward the reference position of the antenna.

15. The IC chip mounting method according to claim 9, wherein the placing the IC chip at the reference position of the antenna is performed by moving the nozzle while the nozzle sucks the IC chip, thereby placing the nozzle close to the antenna, and by the nozzle being controlled to stop sucking the IC chip when the nozzle is at the reference position.