The present invention relates to a contactless information, medium including an. IC chip and a coil antenna, a bobbin member for the contactless information medium, a body member for the contactless information medium, and a method for producing the contactless information medium. In the contactless information medium, the coil antenna is wound around the bobbin member for the contactless information medium. The body member for the contactless information medium forms a part of a body of the contactless information, medium.
Recently, a contactless information medium including an IC chip and an antenna has been widely used in various fields, such as distribution, traffic, finance, entertainment, and amusement. For example, a coin-shaped contactless information medium is used as a token in a transportation facility, or used instead of a coin in an amusement facility (for example, see Patent Literatures 1 to 3). When a contactless information medium is used instead of a token or a coin, a value check and an authenticity determination thereof can be instantly performed by contactless communication with the contactless information medium.
The coin-shaped contactless information medium can be produced, for example, by arranging an IC chip and a coil, antenna into a plate-shaped body member which forms a part of the coin shape, and by covering these built-in components by injection molding. Also, when the weight like a real coin is required for the coin-shaped contactless information medium, a body of the coin-shaped contactless information medium may be formed from a material having high specific gravity, for example, as disclosed in Patent Literatures 1 to 3. Among these documents, in Patent Literature 3, a body of an IC card is formed from a material which includes metal having predetermined specific gravity and specific resistance in order to weight the IC card and to prevent the body of the card from interfering with communication between a built-in IC module and an external device.
On the other hand, Patent Literature 4 discloses a technique related to a coil antenna which performs communication between an IC chip and an external communication device. This coil antenna includes a winding pattern, which is spread into a part or a whole part of a main arrangement pattern forming a loop and which has a winding shape adequately smaller than that of the main arrangement pattern.
Patent Literature 1: Japanese Patent Application Laid-open No. 2002-7989
Patent Literature 2: Japanese Patent Application Laid-open No. 2002-312745
Patent Literature 3: Japanese Patent Application Laid-open No. 2002-7991
Patent Literature 4: Japanese Patent Application Laid-open No. 2009-147560
Incidentally, in an amusement facility, a plurality of (for example, ten or more) coins used for a game and the like may be piled up when used. Thus, when a contactless information medium is used instead of the coin, there is a request to use the contactless information medium in a similar manner. However, when the plurality of contactless information media is piled us, electromagnetic mutual interference occurs. Thus, communication between each of the contactless information media and an external communication device is difficult when the plurality of contactless information media is piled up.
To solve such a problem, it is considered to apply a coil antenna, which includes a small winding pattern and is disclosed in Patent Literature 4, to a conventional contactless information medium. However, production steps become difficult and cumbersome when the coil antenna is applied to a coin-shaped contactless information medium.
First, it is difficult to form a winding pattern with an air core in a step of manufacturing the coil antenna. To form the winding pattern with an air core, special equipment is necessary and a general coil, winding machine cannot be used. Therefore, the production steps become cumbersome and manufacturing costs increase.
In addition, there is a step of attaching an air core coil to one surface of a two-sided adhesive film and attaching the other surface to a body member. In this step, it is not allowed to touch the adhesive surfaces and to make a mistake in attaching. Thus, the step requires an operation by a human hand.
Moreover, in a step of sealing an IC chip and the coil, antenna and forming the coin-shaped outer shape, the film may be melted by heat and pressure during injection molding and the pattern of the coil antenna may be destroyed. In this case, it becomes difficult to secure performance of the contactless information medium to communicate even when the plurality of contactless information media is piled up. It is time-consuming to obtain the stable performance, because it is necessary, for example, to attach a heat-resistant film to protect the pattern of the coil antenna.
In the view of the foregoing, the present invention has been made to provide a contactless information medium, a bobbin member for the contactless information medium, a body member for the contactless information medium, and a method for producing the contactless information medium. The contactless information medium can be easily produced, and when the plurality of contactless information media is piled up, each of the contactless information media can communicate with a communication device. In such a contactless information medium, a coil antenna is wound around the bobbin member for the contactless information medium. The body member for the contactless information medium forms a part of a body of the contactless information medium.
To solve the problem described above and achieve the object, a contactless information medium according to the present invention includes: a body forming an outer shape of the contactless information medium; an IC chip housed in the body; a coil antenna which is formed of a string of conductive wire, both ends of the conductive wire being connected to the IC chip, and which includes a main arrangement pattern provided along a closed curve and a plurality of sub-arrangement patterns, each of which has a smaller diameter than the main arrangement pattern; and a plurality of bobbins provided in the body and arranged along the closed curve, the string of conductive wire being wound around the plurality of bobbins along the closed curve to form the main arrangement pattern, the string of conductive wire being wound around each of the bobbins to form the sub-arrangement patterns.
The above-described contactless information medium further includes an auxiliary bobbin which is arranged along the closed curve and makes the string of conductive wire, which forms the main arrangement pattern, jut out to a side of an outer periphery.
In the above-described contactless information medium, the body includes: a first member which forms a part of the body; and a second member which forms a part of the body and seals, with the first member, the plurality of bobbins, the IC chip, and the coil antenna, and the plurality of bobbins is connected to each of by a fixation member, which fixes the plurality of bobbins, and housed between the first member and the second member.
The above-described contactless information medium further includes a metal member arranged on a side of an outer periphery of the fixation member, the fixation member is arranged on a surface, located on an inner side of the contactless information medium, of the first member, with the plurality of bobbins facing a side of the second member, and the metal member is sealed inside the first member.
The above-described contactless information medium further includes a metal member arranged on a side of an outer periphery of the fixation member and sealed inside the second member.
In the above-described contactless information medium, the body includes: a first member which forms a part of the body; and a second member which forms a part of the body and seals, with the first member, the plurality of bobbins, the IC chip, and the coil antenna, and the plurality of bobbins is provided on a surface, located on an inner side of the contactless information medium, of either the first member or the second member.
The above-described contactless information medium further includes a metal member arranged on a side of an outer periphery of the plurality of bobbins, wherein the plurality of bobbins is provided on a surface, located on an inner side of the contactless information medium, of the first member, and the metal member is sealed inside the first member.
The above-described contactless information medium further includes a metal member arranged on a side of an outer periphery of the plurality of bobbins, the plurality of bobbins is provided on a surface, located on an inner side of the contactless information medium, of the first member, and the metal member is sealed by the first member and the second member.
The above-described contactless information medium further includes a metal member arranged on a side of an outer periphery of the plurality of bobbins, the plurality of bobbins is provided on a surface, located on an inner side of the contactless information medium, of the first member, and the metal member is sealed by the second member and a third member which is different from the first member.
In the above-described contactless information medium, the body is coin-shaped.
A bobbin member for a contactless information medium according to the present invention, around which bobbin member a conductive wire is wound to form a predetermined pattern of a coil antenna in the contactless information medium, includes: a plurality of bobbins arranged along a closed curve; and a fixation member which connects the plurality of bobbins to each other.
A body member for a contactless information medium according to the present invention, which body member forms a part of a body of the contactless information medium, includes: a plurality of bobbins arranged along a closed curve on a surface on an inner side of the contactless information medium.
A method for producing a contactless information medium according to the present invention includes: an arranging step of arranging a unit, which includes an IC chip and an antenna connected to the IC chip, into a mold for injection molding, with a first surface of the unit facing a bottom face of the mold; and a molding step of performing molding by injecting a resin material into the mold to cover a second surface of the unit, the second surface opposing the first surface.
The above-described method for producing a contactless information medium further includes a second arranging step of releasing a molded piece, which has been manufactured in the molding step, from the mold and arranging the molded piece into a second mold for injection molding different from the mold, with the second surface facing a bottom face of the second mold; and a secondary molding step of performing secondary molding by injecting a resin material into the second mold to cover the first surface of the unit.
In the above-described method for producing a contactless information medium, the antenna is formed of a string of conductive wire, both ends of the conductive wire being connected to the IC chip, and includes a main arrangement pattern provided along a closed curve and a plurality of sub-arrangement patterns, each of which has a smaller diameter than the main arrangement pattern.
In the above-described method for producing a contactless information medium, the unit includes a plurality of bobbins arranged along the closed curve, the string of conductive wire being wound around the bobbins along the closed curve, the string of conductive wire being wound also around each of the bobbins.
According to the present invention, a pattern of a coil antenna, which includes a main arrangement pattern forming a closed curve and a plurality of sub-arrangement patterns arranged along the closed curve, is manufactured by winding a conductive wire around a plurality of bobbins arranged along the closed curve. Thus, it becomes possible to easily produce a contactless information medium. Even when the plurality of contactless information media is piled up, each of the contactless information media can communicate with a communication device.
In the following, embodiments of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the following embodiments. Also, each figure referred to in the following descriptions illustrates a shape, a size, and a positional relationship schematically to make it easy to understand contents of the present invention. That is, the present invention is not limited to a shape, a size, and a positional relationship illustrated as an example in each figure.
As illustrated in
As illustrated in
The lower body member 11 is a plate-shaped member which generally has a disk shape. A recess part 11a, on which the bobbin member 13 is arranged, is provided to one principal surface of the lower body member 11. Also, the shallow recess part 16 described above is provided to the other principal surface of the lower body member 11.
A cutout part 11b, which is cut out by a predetermined depth from the outermost periphery, is provided to a peripheral part of the lower body member 11. As described later, the cutout part 11b is a region into which a material of the upper body member 12 is poured during injection molding. Note that by providing such a cutout part 11b and using materials with different colors between the lower body member 11 and the upper body member 12, a design can be put on the surface of the contactless information medium 10.
Such a lower body member 11 is formed, by an injection molding method, from a material in which powder of glass or non-magnetic (or feebly magnetic) metal or alloy is blended into a rigid resin material, such as nylon and acrylonitrile butadiene styrene (ABS) copolymer.
The bobbin member 13 is a member around which the conductive wire 15 is wound to form a coil antenna of a predetermined pattern and which keeps the coil antenna of a predetermined pattern. In the first embodiment, as a pattern of the coil antenna, a pattern, which includes a main arrangement pattern forming a closed curve and a plurality of sub-arrangement patterns arranged along the closed curve, is formed. The diameter of each winding shape of the sub-arrangement patterns is smaller than the diameter of the closed curve. In the first embodiment, the closed curve of the main arrangement pattern is a circular shape.
In the bobbin member 13, the bobbin parts 13b and the auxiliary bobbin parts 13c and 13d are connected to each other via a fixation member 13a. Also, a region 13e, in which the IC chip 14 is arranged, is provided on a surface of the fixation member 13a.
The bobbin parts 13b are arranged along the closed curve C. In other words, the bobbin parts 13b are arranged in such a manner that a path, which connects an end region on the side of an outer periphery of each bobbin part 13b to each other, forms the predetermined closed curve C when viewed from the center of the bobbin member 13. Each of the bobbin parts 13b configures a small bobbin around which the conductive wire 15 is wound to form the sub-arrangement pattern.
The auxiliary bobbin part 13c includes a plurality of end parts 13f projected onto the closed curve C. Between the bobbin parts 13b, the end parts 13f make the conductive wire 15, which forms the main arrangement pattern, jut out to the side of the outer periphery along the closed curve C. Note that in the first embodiment, the end parts 13f of the auxiliary bobbin part 13c are extended onto the closed curve C. However, the end parts 13f may be respectively arranged on a plurality of places on the closed curve C, with each of the end parts 13f as an independent auxiliary bobbin part.
The another auxiliary bobbin part 13d is arranged along the closed curve C and makes the conductive wire 15, which forms the main arrangement pattern, jut out to the side of the outer periphery along the closed curve C. Both ends of the conductive wire 15 are connected, via the auxiliary bobbin part 13d, to the IC chip 14 arranged in the region 13e.
The bobbin parts 13b and the auxiliary bobbin parts 13c and 13d, as a whole, configure a large bobbin around which the conductive wire 15 is wound to form the main arrangement pattern. As illustrated in
Flange parts 13h are provided at apex parts of each of the bobbin parts 13b and the auxiliary bobbin parts 13c and 13d. The flange parts 13h project to the side of the outer periphery more than core parts 13g around which the conductive wire 15 is wound. The flange parts 13h prevent the conductive wire 15 from falling out of the core parts 13g.
For example, such a bobbin member 13 is formed, by the injection molding method, from a heat-resistant resin material such as polymethylpentene (PMP), polybutylene terephthalate (PBT), liquid crystal polymer (LCP), and polyphenylene sulfide (PPS). Note that the bobbin member 13 only needs to have heat resistance which at least allows the bobbin member 13 to keep its solid condition during the injection molding of the upper body member 12.
Note that the shape of the fixation member 13a is not limited to a disk shape or a tabular shape which are illustrated in
The IC chip 14 is a general electronic module, and a function thereof is not particularly limited. The IC chip 14 may include, for example, a storage part which can store various kinds of data such as individual, information (ID), value, an owner, and a circulation history of the contactless information medium 10.
Next, a method for producing the contactless information medium 10 will be described.
First, a pattern of the coil antenna including the main arrangement pattern and the sub-arrangement patterns is formed by winding the conductive wire 15 around the bobbin parts 13b and the auxiliary bobbin part 13c of the bobbin member 13. Note that this step can be done by using a general coil winding machine.
Then, both ends of the conductive wire 15 are connected to the IC chip 14, and the IC chip 14 is temporarily fixed to the predetermined region 13e of the bobbin member 13 with adhesive. Thus, a built-in component 17, in which the bobbin member 13, the IC chip 14, and the conductive wire 15 are integrated, is manufactured (see
Next, as illustrated in
Then, the upper body member 12, which covers the recess part 11a and the cutout part 11b of the lower body member 11, is formed by the injection molding method, and the built-in component 17 is sealed. Thus, the contact less information medium 10 illustrated in
As described above, according to the first embodiment, a contactless information medium which includes a coil antenna including a main arrangement pattern and a sub-arrangement pattern can be produced. The main arrangement pattern forms a closed curve. The sub-arrangement pattern is arranged along the closed curve and has a winding shape having a smaller diameter than the closed curve.
In such a contactless information medium, electromagnetic mutual interference is small. Therefore, even when the plurality of contactless information media is piled up, communication between each of the contactless information media and a communication device becomes possible. For example, even when the plurality of (for example, ten or more) contactless information media is piled up or heaped up, the communication device can communicate with each of the contactless information media. Thus, even in such a state, various kinds of data, such as individual information (ID) of each of the contactless information media, can be monitored and recorded. In addition, it becomes possible to perform a value check and an authenticity determination of each of the contactless information media extemporarily, to detect the position and the number of the contactless information media, and to calculate the total value thereof.
In addition, according to the first embodiment, the pattern of the coil antenna is formed by winding the conductive wire around the bobbins. Thus, a special winding device is not necessary, and a general manufacturing method using a general coil winding machine can be applied. Therefore, production steps of the contactless information medium become easy, and mass production thereof becomes possible. Thus, the manufacturing cost of a single contactless information medium and initial costs for plant and equipment investment can be reduced.
Also, according to the first embodiment, the coil antenna and the IC chip are arranged in the body member, and sealed with a cover member by the injection molding, with the conductive wire being wound around the bobbins. Thus, the pattern of the coil antenna can be kept without being destroyed even in the injection molding. Therefore, the production steps can be simplified and the costs can be reduced. For example, cumbersome steps during the attachment of the pattern of the coil antenna can be omitted, and the attachment of the film to keep the pattern becomes unnecessary. In addition, it becomes possible to secure performance of each of the contactless information media to communicate even when the plurality of contactless information media is piled up.
Also, according to the first embodiment, it becomes possible to produce the contactless information medium inexpensively, making it possible to use the contactless information medium in a wide range of fields. For example, it becomes possible to use the contactless information medium as a coin (chip) used for various games, such as a card game and a board game, and as a token used in a transportation facility. In addition, the contactless information medium can be used in a game for a kid, and the like.
In the first embodiment described above, the outer shape of the contactless information medium has been described as a circular coin shape. However, various shapes may be selected as the outer shape. Examples of the shape include an oval shape, a polygonal shape such as a square shape, a pentagonal shape, and a hexagonal shape, and a star-like shape in which a plurality of places on the circumference projects to the side of the outer periphery.
Also, in the first embodiment, the main arrangement pattern of the coil antenna has been described as a circular closed curve. However, as long as the sub-arrangement patterns can be arranged along the closed curve, the main arrangement pattern is not limited to the circular shape. For example, the main arrangement pattern may be a closed curve with an oval shape, a polygonal shape such as a square shape, a pentagonal shape, or a hexagonal shape, or a star-like shape. In this case, the arrangements and the shapes of the bobbin parts provided to the bobbin member are changed, according to the pattern of the coil antenna.
Also, in the first embodiment, the pattern of the coil antenna (conductive wire 15) has been formed by the bobbin parts 13b and the auxiliary bobbin part 13c. However, as long as the main arrangement pattern forming the closed curve and the sub-arrangement patterns arranged along the closed curve can be formed with cored coils, the arrangement and the shape of the bobbin parts 13b are not limited to what has been described above. For example, other than the bobbin parts 13b forming the sub-arrangement patterns, one or more bobbins to form the main arrangement pattern may be further provided. Alternatively, the auxiliary bobbin parts 13c and 13d may be omitted and the main arrangement pattern and the sub-arrangement patterns may be formed only by the bobbin parts 13b.
Also, in the first embodiment, the sub-arrangement patterns have been formed inside the main arrangement pattern, but the sub-arrangement patterns may be formed outside the main arrangement pattern.
Next, the second embodiment of the present invention will be described.
An outer appearance of a contactless information medium according to the second embodiment is similar to that of the first embodiment, but an inner configuration of the contactless information medium according to the second embodiment is different from that of the first embodiment. Specifically, in the contactless information medium according to the second embodiment, a bobbin part to form a pattern of a coil antenna is directly provided to a body member. Note that a material of each part configuring the contactless information medium according to the second embodiment is similar to that of the first embodiment. In the second embodiment, a pattern, which includes a main arrangement pattern forming a closed curve and a plurality of sub-arrangement patterns arranged along the closed curve, is formed as a pattern of the coil antenna, like the first embodiment. The diameter of each winding shape of the sub arrangement patterns is smaller than the diameter of the closed curve.
As illustrated in
A plurality of bobbin parts 21c protruded from a bottom face of the recess part 21a is provided to the recess part 21a. The bobbin parts 21c are arranged along a closed curve C. In other words, the bobbin parts 21c are arranged in such a manner that a path, which connects an end region on the side of an outer periphery of each bobbin part 21c to each other, forms the predetermined closed curve when viewed from the center of the recess part 21a. The conductive wire 15 is wound around the bobbin parts 21c and forms the main arrangement pattern. Also, the conductive wire 15 is wound around each of the bobbin parts 21c and forms the sub-arrangement patterns. As illustrated in
A flange part 21e is provided at an apex part of each of the bobbin parts 21c. The flange part 21e projects to the side of the outer periphery more than a core part 21d around which the conductive wire 15 is wound. The flange part. 21e prevents the conductive wire 15 from falling out of the core part 21d.
Note that in the second embodiment, like the first embodiment, an auxiliary bobbin part may be provided on the closed curve C and jutted out to the side of the outer periphery of the conductive wire 15 forming the main arrangement pattern. Instead, a bobbin to form the main arrangement pattern may be provided separately from the bobbin parts 21c.
Next, a method for producing the contactless information medium according to the second embodiment will he described. Note that the lower body member 21 is manufactured in advance from a predetermined resin material by the injection molding method.
First, a pattern of the coil antenna including the main arrangement pattern and the sub-arrangement patterns is formed by winding the conductive wire 15 around the bobbin parts 21c of the body member. Note that this step can be done by using a general coil winding machine. Then, both ends of the conductive wire 15 are connected to the IC chip 14, and the IC chip 14 is temporarily fixed to a predetermined region on the bottom face of the recess part 21a with adhesive. Then, for example, thermosetting or ultraviolet-curing adhesive may be solidified at least on the IC chip 14 and the conductive wire 15 for the protection thereof.
Then, as illustrated in
As described above, according to the second embodiment, the bobbin parts to form the coil antenna are integrated with the body member, whereby the number of components can be reduced. Thus, the production steps can be simplified and the manufacturing costs can be reduced.
Next, the third embodiment of the present invention will be described.
As illustrated in
A metal member 31d is arranged inside a peripheral part 31c which is on the side of the outer periphery more than the recess part 31a of the lower body member 31. A material of the metal member 31d is selected from various kinds of metal or alloy, such as copper, aluminum, or brass, according to the weight required for the contactless information medium 30. The metal member 31d is substantially C-shaped. The C-shape is shaped by cutting a part of a circular ring. Note that the number of metal members 31d arranged in the peripheral part 31c is not limited to one. For example, a plurality of metal members may be arranged in the peripheral part 31c with an interval therebetween.
Such a lower body member 31 is manufactured by performing injection molding with the metal member 31d as a core.
As described above, according to the third embodiment, the metal member is arranged in the peripheral part of the contactless information medium. Thus, the contactless in medium can be weighted with a simple configuration, without interfering with the communication by the coil antenna.
Note that other than this, as a method to weight the contactless information medium, a method to adjust specific gravity of the resin material, which forms the lower body member 31 and the upper body member 12, may be used. The specific gravity is adjusted, for example, by blending metallic powder to the resin material.
Also, in the third embodiment, the bobbin parts may be directly provided to a bottom face of the recess part 31a instead of using the bobbin member 13, like the second embodiment.
Next, the fourth embodiment of the present invention will be described.
As illustrated in
Next, a method for producing the contactless information medium 40 will be described.
First, as illustrated in
Note that in
Then, primary molding is performed by injecting a melted resin material into the cavity 44c through a sprue 44d. Thus, the upper body member 42 is formed, and a surface 17b of the built-in component. 17 is covered. Here, by optimizing a position of a gate 44e and the direction of injecting the resin material, the built-in component 17 is pressed by injection pressure of the resin material. Note that a resin material having a base color is used in the primary molding step.
Then, a primary molded piece manufactured in the primary molding step is released from the mold 44.
Then, as illustrated in
Then, secondary molding is performed by injecting a melted resin material into the cavity 45c through a sprue 45d. Note that a resin material used in the secondary molding step has a different color from the resin material used in the primary molding step. In the secondary molding step, the lower body member 41 is formed and the built-in component 17 is sealed. Also, the recess (not illustrated) provided to the surface of the primary molded piece is filled with the resin material having a different color and the image is formed. Then, by releasing a secondary molded niece from the mold 45, the contactless information medium 40 in the shape of a final product can be obtained, as illustrated in
As described above, in the fourth embodiment, the built-in component 17 is directly placed in the mold 44 for injection molding, and one surface of the built-in component 17 is covered while the upper body member 42 is formed. Thus, it is possible to reduce laboring hours and production steps considerably, to shorten lead time, and to further reduce costs, compared to the production method of the first embodiment in which the lower body member 11 (see
Note that in the fourth embodiment, surface colors of center parts are different between the lower body member 41 and the upper body member 42, but by attaching labels to the center parts, the coin-shaped contactless information medium can be used without any problem.
Also, in the fourth embodiment, the built-in component 17, in which the bobbin member 13, the IC chip 14, and the conductive wire 15 are integrated, is sealed by the two-color molding method. However, instead of the built-in component 17, a sheet-like coil unit, an RFID inlay, a substrate module, or the like may be arranged and the contactless information medium may be manufactured in a similar production method. In the sheet-like coil unit, an air core coil is sandwiched between adhesive films or the like. In the RFID inlay, an IC chip and an antenna are arranged on a PET film or the like. Note that it is preferable, for example, to cover the surface with adhesive or the like in advance for protection, in order not to damage these built-in components by heat and pressure of molded resin.
Next, the fifth embodiment of the present invention will be described.
As illustrated in
To an inner surface 51a of the lower body member 51, a plurality of bobbin parts 51b protruded from the inner surface 51a is provided. The conductive wire 15 is wound around the bobbin parts 51b. Note that the shape and the arrangement of the bobbin parts 51b are similar to those of the bobbin parts 21c illustrated in
Note that in the fifth embodiment, a peripheral part of the lower body member 51 is one step lower than a center part thereof, in order to adjust the position in the thickness direction of the metal member 53 in the contactless information medium 50. However, the center part and the peripheral part may be on the same flat surface.
Next, a method for producing the contactless information medium 50 will be described.
First, the lower body member 51 is manufactured by the injection molding method. Then, the conductive wire 15 is wound around the bobbin parts 51b, and the IC chip connected to the conductive wire 15 is fixed to the inner surface 51a with adhesive or the like. Here, the peripheral part of the lower body member 51 is lower than the bobbin parts 51b. Therefore, the conductive wire 15 can be easily wound around the bobbin parts 51b using a general coil winding machine. Note that the IC chip 14 and the conductive wire 15 may be covered with adhesive or the like in order to protect the IC chip 14 and to keep a winding pattern of the conductive wire 15.
Then, as illustrated in
Then, injection molding is performed by injecting a melted resin material into the cavity 54c through a sprue 54d. Then, by releasing a molded piece from the mold 54, the contactless information medium 50 in the shape of a final product can be obtained.
Next, the sixth embodiment of the present invention will be described.
As illustrated in
The bobbin member 61 includes a bobbin base 61a and a plurality of bobbin parts 61c provided to an inner surface 61b of the bobbin base 61a. The conductive wire 15 is wound around the bobbin parts 61c. Note that the shape and the arrangement of the bobbin parts 61c are similar to those of the bobbin parts 13b illustrated in
The bobbin base 61a is thicker than the fixation member 13a illustrated in
Next, a method for producing the contactless information medium 60 will be described.
First, the bobbin member 61 is manufactured by the injection molding method. Then, the conductive wire 15 is wound around the bobbin parts 61c, and the IC chip 14 connected to the conductive wire 15 is fixed to the inner surface 61b with adhesive or the like. Here, the inner surface 61b of the bobbin member 61 is a flat surface. Therefore, the conductive wire 15 can be easily wound around the bobbin parts 61c by a general, coil winding machine. Note that the IC chip 14 and the conductive wire 15 may be covered with adhesive or the like in order to protect the IC chip 14 and to keep a winding pattern of the conductive wire 15.
Then, as illustrated in
Then, primary molding is performed by injecting a melted resin material into the cavity 65c through a sprue 65d. The IC chip 14 and the conductive wire 15 wound around the bobbin parts 61c are sealed in the primary molding step.
Then, a primary molded piece is released from the mold 65 and arranged, as illustrated in
Then, secondary molding is performed by injecting a melted resin material into the cavity 66c through a sprue 66d. Note that a resin material used in the secondary molding step has a different color form the resin material used in the primary molding step. In the secondary molding step, the metal member 63 is sealed. Also, the recess (not illustrated) provided to the surface of the primary molded piece is filled with the resin material having a different color and the image is formed. Then, by releasing a secondary molded piece from the mold 66, the contactless information medium 60 in the shape of a final product can be obtained.
Note that in the sixth embodiment, surface colors and materials of center parts are different between both surfaces of the contactless information medium 60, but by attaching labels to the center parts, the coin-shaped contactless information medium can be used without any problem.
10,20,30,40,50,60 contactless information medium
10
a label
11,21,31,41,51 lower body member
11
a,21a,31a recess part
11
b,21b,31b cutout part
12,22,42,52 upper body member
13,61 bobbin member
13
a fixation member
13
b,
21
c,
51
b,
61
c bobbin part
13
c,
13
d auxiliary bobbin part
13
e region
13
f end part
13
g,21d core part
13
h,
21
e flange part
14 IC chip
15 conductive wire
16 recess part
17 built-in component
17
a rear surface
17
b surface
31
c peripheral part
31
d,
43,53,63 metal member
44,45,54,65,66 mold
44
a,
45
a,
54
a,
65
a,
66
a lower mold
44
b,
45
b,
54
b,
65
b,
66
b upper mold
44
c,
45
c,
54
c,
65
c,
66
c cavity
44
d,
45
d,
54
d,
65
d,
66
d sprue
44
e gate
44
f,65e pin
46 primary molded piece
51
a,
61
b inner surface
61
a bobbin base
61
d outer surface
62 body member
64 surface member
Number | Date | Country | Kind |
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2011-288413 | Dec 2011 | JP | national |
Filing Document | Filing Date | Country | Kind |
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PCT/JP2012/081567 | 12/5/2012 | WO | 00 |