1. Field of the Invention
The present invention relates to a pickup device which separates a piece attached to a film from the film. Also, the present invention relates to a pickup method for separating a piece attached to a film from the film.
2. Description of the Related Art
In recent years, downsized electronic devices and portable electronic devices have become mainstream, and along with that, demand for smaller and thinner semiconductor devices has been increasing. In addition, development of a semiconductor device which has an integrated circuit formed of thin film transistors over plastic has been advanced.
An IC chip used for a semiconductor device and an integrated circuit formed of a thin film transistor are formed by cutting a silicon wafer and a plastic substrate attached to an adhesive film into a lattice pattern in a dicing process.
Conventionally, a piece (an IC chip, pellet, or the like, which hereinafter will be also referred to as a chip) which is diced over an adhesive film is pushed up from a back side (bottom) of the film using a push-up pin, and the chip rising from the adhesive film is picked up by a collet, then placed on a tray or mounted on a printed-circuit board (for example, see Patent Document 1: Japanese Patent Laid-Open No. H5-3242).
However, when a chip is raised from an adhesive film by using a pointed pin as described in Patent Document 1, there is a problem that the chip is damaged. Typically, in a case of an IC chip diced from a wafer, there is a problem such as a crack or flaw of a chip, or the like. In addition, in a case of a film-like chip, there is a problem such as a tear of a chip, or the like.
In view of the foregoing problem, it is an object of the present invention to provide a device which can pick up a chip while preventing damage of the chip over an adhesive film. Furthermore, the present invention provides a device which can pick up a chip over an adhesive film with a high yield.
One feature of the present invention is a pickup device including: a frame which is fixed to a support and holds a film to which a chip is attached; a pressing jig which presses a surface of the film, to which a chip is not attached, while moving relative to the frame in a direction parallel to a surface of the film, to which the chip is attached; a holding jig which holds the chip attached to a portion of the film being pressed or having been pressed by the pressing jig; and a moving unit which moves the holding jig.
Another feature of the present invention is a pickup device including: a frame which fixes a film to which a chip is attached; a support which holds the frame; a pressing jig which presses a surface of the film, to which a chip is not attached, while moving relative to the frame in a direction parallel to a surface of the film, to which the chip is attached; a holding jig which holds the chip attached to a portion of the film being pressed or having been pressed by the pressing jig; and a moving unit which moves the holding jig.
The support and/or the pressing jig is connected to a moving unit, so that part of the chip over a film can be separated from the film by pressing the pressing jig against the film while moving either the film held by the support, the pressing jig, or both, relative to one another. At this time, the pressing jig presses the film so that the film is bent. In addition, it is preferable that the pressing jig press the film so that at least two sides of the chip are separated from the film.
The pressing jig is preferably a rotation body such as a cylinder, a polygonal cylinder, or a sphere. In this case, by pressing the rotation body against the film while rotating the rotation body, part of the chip can be separated from the film. Alternatively, the rotation body can be moved without being rotated, while its rotation surface is pressed against the film.
Alternatively, the pressing jig is preferably a movable body such as a rectangular solid. In this case, by pressing an edge or surface of the rectangular solid against the film while moving the rectangular solid, part of the chip can be separated from the film.
A surface of the pressing jig is preferably uneven. For typical examples, the surface is grooved, ridged, embossed, or has a projection.
As the film to which the chip is attached, a film, sheet, or tape having an adhesive layer on one side can be used. The film does not necessarily have an adhesive layer, and in this case, the chip is attached to the surface of the film by static electricity or adsorption power.
As the holding jig which holds the chip part of which is separated from the film pressed by the pressing jig, a gripper such as a pair of tweezers or a pawl, a collet, a nozzle which can adsorb (hereinafter also referred to as a suction nozzle) or the like can be given. (Alternatively, the nozzle may also be referred to as an adsorption nozzle.) In addition, a tip of the suction nozzle is preferably formed of an elastic body. In addition, the suction nozzle is preferably connected to a decompression device.
The pickup device may be provided with one or more of an image recognition unit and a transport means. The transport means transports a tray on which the chip is placed, a wiring board, or the like.
Another feature of the present invention is a pickup method in which either a film to which a chip is attached and which is held by a frame, a pressing jig, or both are moved relative to one another in a horizontal direction to press the film, and the chip is picked up from the film.
Another feature of the present invention is a pickup method in which either a film to which a chip is attached and which is held by a frame, a pressing jig, or both are moved relative to one another in a horizontal direction, while the pressing jig is rotated, to press the film, and the chip is picked up from the film.
Either a film to which a chip is attached and which is held by a frame, a pressing jig, or both are moved relative to one another in a horizontal direction to press and bend the film, and spaces are formed between the chip and the film, then the chip is picked up. In addition, the horizontal direction is a direction parallel to a surface of the film, to which the chip is attached.
By pressing up or pressing down the film to which the chip is attached using the pressing jig, at least two sides of the chip are separated from the film, and an adhesive area between the chip and the film decreases; whereby adhesive or cohesive strength decreases. Therefore, when the chip part of which is separated from the film is held by a holding jig, the chip can be separated from the film easily.
As for the pickup device of the present invention, a member which separates a chip from a film is not sharply pointed, so that the chip can be picked up from the film without being damaged. In addition, since the film to which the chip is attached is pressed by the rotation surface, edge, or surface of the pressing jig while the pressing jig is moved or rotated, the chip can be separated from the film without being damaged, and with a high yield. Furthermore, the chip which is picked up from the film can be placed on a tray easily. Furthermore, the chip can be mounted on a printed-circuit board after aligning a terminal formed over the printed-circuit board and a terminal of the chip, which can enhance throughput.
Embodiment modes of the present invention will be described hereinafter with reference to the drawings. However, the present invention can be carried out in various modes, and it is easily understood by those skilled in the art that modes and details can be changed in various ways without departing from the spirit and scope of the invention. Therefore, the invention is not interpreted as being limited to the following description of the embodiment modes. It is to be noted that identical portions or portions having the same functions in all figures for explaining the embodiment modes are denoted by the same reference numerals, and repeated descriptions thereof are omitted.
In this embodiment mode, a pickup device including a jig for pressing a film to which a chip is attached (hereinafter referred to as a pressing jig), a jig for holding a chip which is pressed (hereinafter referred to as a holding jig), and a support for holding a frame to which the film is fixed will be described.
Here, the pressing jig 101 for pressing up the film 103 will be described with reference to
In addition, it is preferable that a surface of the pressing jig 101 which presses the film 103 be uneven. As typical examples of the uneven surface, a grooved surface, a surface with a projection, a ridged surface, an embossed surface and the like can be given. As typical examples of a pressing jig 101 having such an uneven surface, a rotation body or a movable body with grooves 101e as shown in
Since the pressing jig 101 surface which presses the film 103 is uneven, a space 111c is formed between the pressing jig 101 and the film 103, as shown in
In addition, in
Here, a cylinder is used as the pressing jig 101.
Next, sizes of the chip 106 and the pressing jig 101 for pressing up the film 103 will be described with reference to
Alternatively, in a case where the pressing jig 101 for pressing up the film 103 is the sphere 101c as shown in
In the above-described process, the at least two sides of the chip 106 may be two sides facing to each other, or two sides adjacent to each other. Furthermore, when half or more of each of the two sides is raised up, the chip 106 can be easily picked up by the holding portion later.
Next, the film 103 and the frame 102 to which the film 103 is fixed will be described with reference to
It is to be noted that a film having no adhesive layer may be used instead of the adhesive film. In this case, the chip is attached to the film by electrostatic force or adsorption power.
Here, an adhesive film, more specifically a pressure-sensitive film, is used as the film 103.
The frame 102 for fixing the film 103 is formed of two circular frames 102a, 102b in this embodiment mode, and the film 103 is sandwiched between the two frames 102a, 102b without bending, so as to be fixed. An expanded ring may be used as the frame 102 for fixing the film 103.
It is to be noted that, although a rectangle is shown as a shape of the chip 106 provided over the film 103 in
In this embodiment mode, a flexible substrate over which a thin film integrated circuit is formed is used as the chip 106.
As the holding jig 104, a suction nozzle, a collet, a gripper such as a pair of tweezers or a pawl, or the like can be used. The suction nozzle is used as the holding jig 104, here.
The suction nozzle as a typical example of the holding jig 104 will be described with reference to
Furthermore, by providing a heater for the nozzle 104a, the nozzle 104a can have a heating function in addition to a holding function. By providing the heater for the nozzle 104a, the chip 106 can be mounted on a printed-circuit board by thermo compression bonding using the heated heater provided for the nozzle 104a, after the chip 106 provided over the adhesive film 103 is picked up by adsorbing it by the nozzle 104a and moved to the printed-circuit board. In this case, a heat-resistant elastic body which can resist a heating temperature of the thermo compression bonding process may be provided for a tip of the base portion 112 of the nozzle 104a.
Alternatively, a nozzle 104a for suction and a nozzle 104b having a heater may be provided independently, as shown in
Alternatively, a nozzle with aspiration ports lined in one direction may be used, as shown in
The holding jig 104 is connected to a robot arm, and the robot arm is further connected to a moving unit, so that lifting, lowering, and horizontal movements (in X, Y, and Z directions) can be freely performed. Furthermore, by providing a rotational apparatus such as a motor for an axis of the nozzle, even a direction of the chip (θ direction) can be rotated, which makes alignment in a case where the chip is mounted on the printed-circuit board easier.
Next, a structure example of a pickup device of the present invention will be described with reference to
In this embodiment mode, an example in which the pressing jig 101 for pressing up the film 103 presses upward so as to raise at least two sides of the chip 106 from the film 103, and the chip 106 is adsorbed and picked up by the holding jig 104 is described, but the invention is not limited thereto. The pressing jig 101 may be provided above the film 103 and the holding jig 104 may be provided under the film 103, so that the pressing jig 101 presses the film 103 downward and the chip 106 is picked up.
Furthermore, although an example in which the support 141 of the frame 102 for fixing the film 103 is fixed to the pickup device is described, a support provided for an XY stage may be used instead. By using such a support, the frame 102 can be moved in X and Y directions.
In this embodiment mode, a method for picking up a chip using a pickup device of the present invention will be described.
As shown in
As a result, as shown in
As shown in
Next, a method for moving the pressing jig 101, the frame 102 holding the film 103, and the holding jig 104 relative to one another will be described with reference to
As shown in
Alternatively, as shown in
Further alternatively, as shown in
Next, a method for collecting chips 106 over the film 103 onto the tray will be described with reference to
As shown in
Next, a method in which the chip 106 over the film 103 is mounted on the printed-circuit board 125 will be described with reference to
As shown in
Next, as shown in
Next, as shown in
Through the above-described process, the chip 106 over the film 103 can be mounted on the printed-circuit board 125 easily.
This application is based on Japanese Patent Application serial No. 2005-284550 filed in Japan Patent Office on Sep. 29, 2005, the contents of which are hereby incorporated by reference.
Number | Date | Country | Kind |
---|---|---|---|
2005-284550 | Sep 2005 | JP | national |
Number | Name | Date | Kind |
---|---|---|---|
4472218 | Avedissian et al. | Sep 1984 | A |
4859269 | Nishiguchi | Aug 1989 | A |
6074934 | Dautartas et al. | Jun 2000 | A |
6123800 | Freund et al. | Sep 2000 | A |
6290805 | Freund et al. | Sep 2001 | B1 |
6561743 | Nakatsu | May 2003 | B1 |
6889427 | Yee et al. | May 2005 | B2 |
7465142 | Yoo | Dec 2008 | B2 |
20020019074 | Nakazawa et al. | Feb 2002 | A1 |
20040091342 | Yajima et al. | May 2004 | A1 |
20040115904 | Cheung et al. | Jun 2004 | A1 |
Number | Date | Country |
---|---|---|
1431692 | Jul 2003 | CN |
1431692 | Jul 2003 | CN |
1321966 | Jun 2003 | EP |
5-3242 | Jan 1993 | JP |
2001-118862 | Apr 2001 | JP |
2003-224088 | Aug 2003 | JP |
2004-241685 | Aug 2004 | JP |
Number | Date | Country | |
---|---|---|---|
20070069340 A1 | Mar 2007 | US |