JP3755186B2 - Object holding device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an object holding device for holding an object such as a circuit board or a liquid crystal display panel with flatness.
[0002]
[Prior art]
An electronic component, for example, a component such as a so-called bare chip may be mounted on a liquid crystal display panel or the like that is an object. The bare chip mounted on the liquid crystal display panel is, for example, a driving IC. Such an electronic component is mounted on a predetermined position of the liquid crystal display panel using a component mounting device, and the electronic component is mounted on a predetermined wiring of the liquid crystal display panel. The pattern is electrically connected by thermocompression bonding through an anisotropic conductive film.
Thus, when the electronic component is thermocompression bonded to the wiring pattern of the liquid crystal display panel via the anisotropic conductive film, the parallelism between the electronic component and the liquid crystal display panel becomes a problem. The reason for this is that the thickness of the anisotropic conductive film is as thin as about several tens of μm, so that the liquid crystal display panel 1 is flat and is not held against the table. This is because the protruding electrode cannot be reliably connected to the wiring pattern of the liquid crystal display panel via the anisotropic conductive film.
Therefore, conventionally, as shown in FIG. 15, the liquid crystal display panel 300 is held by the table 400 by vacuum suction by the vacuum suction member 500 of the table 400.
[0003]
[Problems to be solved by the invention]
However, in the case where the liquid crystal display panel 300 is vacuum-suctioned and held by the vacuum suction member 500 as described above, a part of the liquid crystal display panel 300 is strongly vacuum-sucked. There is a problem that Newton rings occur. In addition, the thickness of the polarizing plate 301 of the liquid crystal display panel 300 varies, and the so-called surface adsorption method of the polarizing plate 301 of the liquid crystal display panel 300 by the vacuum suction member 500 is affected by the variation of the thickness of the polarizing plate. The parallelism (flatness) of the substrate 302 of the liquid crystal display panel 300 cannot be obtained well. Therefore, a troublesome work of attaching the polarizing plate 301 to the substrate 302 after attaching electronic components to the substrate 302 is necessary.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an object holding device that can solve the above problems and can reliably hold an object such as a liquid crystal display panel with flatness.
[0004]
[Means for Solving the Problems]
To achieve the above object, the present invention is, in the object holding device for holding objects that need to be held to have a flatness, a base, provided on the base, the object one a first support means for supporting one end face in surface contact, provided on the base, a second support supporting contacts the other end of the one surface of said object to a linear and means, the position between the one end and the other end of the one surface of said object, and a suction means for holding elastically removably adsorption, the second support means, the target A semi-cylindrical support member that linearly contacts and supports the other end of one surface of the object, and a fixing member that fixes the position of the support member so as to be changeable on the base.
[0005]
In the present invention, the first support means, supporting the one end of one surface of the object. The second support means supports the other end of one surface of the object in surface contact. On the other hand, the second support means supports the other end of one surface of the object in a linear contact. In such a state, the suction means detachably sucks and holds the position between one end side and the other end side of one surface of the object. Accordingly, one end of one surface of the object is supported by the first support means so as to follow the surface, and the other end of the one surface of the object is linearly contacted by the second support means. Therefore, the object only needs to increase the flatness of the first support means, and if the second support means is adjusted to the surface of the first support means, the flatness of the object can be increased. It can be put out accurately. That is, since the other end side of the object is in linear contact with the second support means, the flatness of the object is adjusted by adjusting the second support means with respect to the first support means. Can only be done. The adsorption means can hold the object held by the first support means and the second support means elastically and without causing distortion when holding the object. Even when a component is mounted on the object thus held, the object is fixed while maintaining flatness.
[0006]
In the present invention, since the position of the second support means and the suction means can be changed on the base, even if the size of the liquid crystal display panel changes or the support direction of the liquid crystal display panel changes, it can cope with it.
In the present invention, the second support means is a semi-cylindrical support member for linearly contacting and supporting the other end of the object, and this support member changes its position with respect to the substrate. it can. By doing in this way, even if the size of an object changes or the direction which an object holds changes, it can respond to it. As a system in which the suction means elastically sucks the object in a detachable manner, by using a suction pad, even if the shape of the object changes, it can be elastically supported and reliably held.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings.
Note that the embodiments described below are preferred specific examples of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention is particularly limited in the following description. Unless otherwise stated, the present invention is not limited to these forms.
1 and 2 show a preferred embodiment of a component mounting apparatus having an object holding device of the present invention. The component mounting apparatus 10 includes a base 11, a head moving unit 30, an electronic component supply unit 16, a holding head (tool) 20, a stage (object holding unit) 40, and the like.
The base 11 supports the head moving unit 30, the electronic component supply unit 16, the camera 17, the stage 40, and the like.
[0008]
The head moving unit 30 in FIG. 1 is a moving unit that moves the holding head 20 in the X direction. The head moving means 30 includes a support column 9 and a guide member 12 held by the support column 9. The motor M of the guide member 12 has a feed screw 12 a, and the feed screw 12 a meshes with a nut 13 a of the electronic component transport device 13. Therefore, by operating the motor M and rotating the feed screw 12a, the electronic component transport device 13 can be moved and positioned in the X direction.
The electronic component transport apparatus 13 includes the holding head 20 described above, and can index the movable body 22 in the r direction by operating the motor M3. The movable body 22 holds the holding head 20 in a detachable manner. The electronic component transport device 13 includes a motor M2 and a camera 14. By operating the motor M2, the movable body 22 and its holding head 20 can be moved and positioned in the Z direction.
[0009]
The stage 40 in FIGS. 1 and 2 is movable along the guide rails 41 and 41, and the feed screw 42 is rotated by operating the motor M4. Therefore, the stage 40 is moved along the guide rail 41. It can be positioned by moving in the Y direction. The stage 40 is an object on which a liquid crystal display panel or a printed wiring board, for example, is placed. For example, in this embodiment, the object is the liquid crystal display panel 19. Note that the X, Y, and Z directions in FIG. 1 described above are orthogonal to each other.
[0010]
As a result, the holding head 20 of the electronic component transport device 13 sucks and holds the electronic component PA supplied to the electronic component supply unit 16 in advance, moves in the X direction, and the camera 17 sucks the electronic component PA. , The control unit 100 recognizes the suction posture of the electronic component PA held by the holding head 20.
Then, the electronic component transport device 13 moves in the X direction, and an alignment mark (not shown) on the pattern of the liquid crystal display panel 19 is recognized by the camera 14 provided in the electronic component transport device 13, whereby the liquid crystal The electronic component mounting position on the display panel 19 is confirmed. As a result, the holding head 20 of the electronic component transport device 13 mounts the electronic component PA on the predetermined mounting position of the liquid crystal display panel 19.
[0011]
FIG. 3 shows the stage 40 of FIG. 1, the electronic component transport device 13 and the like.
The movable body 22 of the electronic component transport apparatus 13 holds the holding head 20 in a replaceable manner. The component holding surface 20 a of the holding head 20 can detachably hold the electronic component 18 by the operation of the vacuum suction source 77. On the other hand, the stage 40 can suck and hold the liquid crystal display panel 19 by the operation of the vacuum suction source 77.
A suction passage is formed at the center of the component holding surface 20 a of the holding head 20 and is connected to a vacuum suction source 77. The component holding surface 20a is, for example, a rectangular flat surface when viewed from below.
[0012]
The movable body 22 in FIG. 3 can be positioned by moving in the arrow Z direction by the motor M2. This motor M2 is, for example, a stepping motor. The rotation position (rotation angle) of the motor M2 can be measured by the encoder 63. The rotational position of the motor M2 digitally measured by the encoder 63 can be sent to the control unit 100 as an encoded value of the position of the movable body 22 and the holding head 20 in the arrow Z direction.
In FIG. 3, the motor M4 moves and positions the stage 40 in the Y direction as described above. The motor M can detect the rotational position (rotation angle) by the encoder 185. It has become. The rotational position of the motor M4 detected digitally by the encoder 185, that is, the position of the stage 40 in the Y direction can be sent to the control unit 100.
[0013]
The heating power source 130 supplies heating power to the heater H. The heater H is provided in the holding head 20 and heats the component holding surface 20a of the holding head 20. The component holding surface 20a can be made of, for example, industrial diamond.
The control unit 100 can control the motors M, M2, M3, M4, the vacuum suction source 77, and the heating power source 130 as shown in FIGS. The encoded values of the encoders 185 and 63 can be given to the control unit 100.
[0014]
Here, the liquid crystal display panel 19 as an object will be described with reference to FIG.
The liquid crystal display panel 4 which is the object of FIG. 4 is formed by laminating a glass substrate 4a, a counter glass 4b, and two polarizing plates 4c and 4d. Liquid crystal is sealed between the substrate 4a and the counter glass 4b.
The polarizing plates 4c and 4d have a function of directing light from the backlight in a certain direction.
The size of the substrate 4a is larger than the size of the counter glass 4b and the polarizing plates 4c and 4d, and the portion of the substrate 4a that protrudes to the side of the counter glass 4b is a circuit portion 4e for mounting electronic components. The circuit portion 4e protrudes from two of the four sides, and for example, electronic components PA1, PA2, and PA3 that are driving ICs are electrically connected to the wiring pattern FP of the circuit portion 4e. There is a need. This wiring pattern FP is a wiring pattern of a fine pitch transparent conductive film, and the interval between conductors of the wiring pattern is very narrow.
[0015]
The electronic component PA (PA1, PA2, PA3) shown in FIG. 4 is electrically connected to the wiring pattern FP of the circuit portion 4e through the anisotropic conductive film ACF by using bumps BP that are protruding electrodes. It is like that.
The anisotropic conductive film ACF is formed by, for example, covering the spherical conductive particles DT with an insulating material portion DS. The bump BP is subjected to thermocompression bonding (pressurization while heating) from above. Since the insulating portion DS is broken and the conductor DT can be exposed, the bump BP and the wiring pattern FP can be electrically connected by the conductor DT.
[0016]
5 and 6 show the stage 40 shown in FIGS. 1 and 2. This stage 40 is the object holding device of the present invention. The stage 40 includes a base 210, first support means 212, second support means 214, suction means 216, and the like.
First, the first support means 212 is made of, for example, transparent quartz glass and is integrated with the base 210. The support surface 220 of the first support means 212 is a flat surface in which flatness (flatness) is ensured, and has a function of supporting the circuit portion 4e of the liquid crystal display panel 19 by surface contact. In this embodiment, the support surface 220 has a rectangular shape as viewed from above. The first support means 212 is provided to protrude in the vertical direction on one end side of the base 210. The base 210 has a plurality of positioning holes 221 on its upper surface in the X and Y directions.
[0017]
The second support means 214 has a shape as shown in FIGS. That is, the second support means 214 includes a support member (a cradle) 225, a fixing member (a cradle lower part) 226, and a plurality of screws 227. The support member 225 has a substantially semi-cylindrical shape, and is made of a material having high hardness and high accuracy such as duralumin.
The apex portion of the support member 225 in the axial direction is a portion that supports the lower surface of the polarizing plate 4d of the liquid crystal display panel 19 in linear contact as shown in FIG. 5 or FIG. A portion that is in contact with and supports this linear shape is shown by a straight line L in FIG.
The support member 225 in FIG. 8 can be fixed to the fixing member 226 using screws 227. However, when the support member 225 is fixed to the fixing member 226 with the screw 227, a spacer 229 such as a washer having a predetermined thickness can be used. The spacer 229 serves to make the apex portion 225a (indicated by the line L) of the support member 225 parallel to the support surface 220 of the first support means 212 of FIG. 5 or FIG. As shown in FIG. 9, the height H (see FIG. 10) of the line L in FIG. 8 from the stage 40 is lower than the height H1 from the stage 40 by the thickness of the polarizing plate 4d.
[0018]
The fixing member 226 can be fixed to any positioning hole 221 of the base 210 by loosening the screw 227 of FIG. 5 or FIG. That is, the second support means 214 can be set by changing the fixing location to a position required for the base 210. The second support means 214 can be positioned and fixed in a direction approaching or moving away from the first support means 212 and so that the second support means 214 is parallel to the first support means 212. .
[0019]
Next, the suction means 216 shown in FIGS. 5 and 6 will be described.
Four suction means 216 are set on the base 210 in the illustrated examples of FIGS. 5 and 6. The adsorption means 216 has a structure as shown in FIG. The suction means 216 includes a rubber suction pad 230 and a fixing member 231, and the screw 233 can fix the main body 235 of the suction pad 230 to the fixing member 231. Also in this case, the height of the suction pad 230 relative to the fixing member 231 can be adjusted by setting a spacer 237 such as a washer having a predetermined thickness.
The screw 234 fixes the fixing member 231 to the positioning hole 221 of the base 210 in FIG.
[0020]
The suction pad 230 is made of rubber as described above, and can suck the lower surface of the polarizing plate 4d of the liquid crystal display panel 19 as shown in FIG. The suction pad 230 is connected to the vacuum suction source 77 of FIG. Accordingly, when the vacuum suction source 77 is operated, the suction pads 230 of the four suction means 216 in FIG. 5 can suck and firmly fix the lower surface of the polarizing plate 4d.
The reason why the suction pad 230 can be elastically deformed as if it is made of rubber is as follows. That is, since there is an error in the thickness of the polarizing plate 4d of the liquid crystal display panel 19, even if the thickness of the polarizing plate 4d is increased or decreased in order to cope with this, the lower surface of the polarizing plate 4d is surely obtained. This is so that the side can be adsorbed.
[0021]
Next, an example of setting the liquid crystal display panel on the stage 40 will be described with reference to FIGS.
Referring to FIGS. 5 and 9, one circuit portion 4 e of the liquid crystal display panel 19 is supported in surface contact with the support surface 220 of the first support means 212. On the other hand, the polarizing plate 4d on the other end side of the liquid crystal display panel 19 is supported in contact with the second support means 214 in a linear shape (also referred to as a wire receiver).
In such a state, the height H from the apex portion 225a of the support member 225 of the second support means 214 to the upper surface of the base 210 is the height of the support surface 220 of the first support 212 with respect to the base 210. It is set smaller than H1 by the thickness D of the polarizing plate 4e.
By doing so, the liquid crystal display panel 19 can be set parallel to the upper surface 210 a of the base 210 of the stage 40. In addition, each suction pad 230 of the suction means 216 can vacuum-suck a substantially intermediate position between the circuit portion 4e on one end side of the liquid crystal display panel 19 and the end portion of the polarizing plate 4d on the other end side. .
Therefore, the liquid crystal display panel 19 is held so as not to move by the suction means 216 while maintaining flatness with respect to the upper surface 210a of the base 210 (in a state of being parallel to the upper surface 210a of the base 210). be able to.
[0022]
Next, the operation of the component mounting device of FIGS. 1 and 2 and the operation of the object holding device of FIGS. 5 and 6 will be briefly described.
Consider the case where the component mounting apparatus of FIG. 1 mounts electronic components PA (PA1, PA2, PA3) such as a drive IC as shown in FIG.
In this case, as shown in FIG. 5, in the liquid crystal display panel 19, the circuit portion 4e on the side having a relatively small area is supported on the support surface 220 of the first support means 212 in surface contact, and the polarizing plate 4d. These end portions are supported by the support member 225 of the second support means 214 so as to come into linear contact. When the vacuum suction source 77 is activated, the four suction pads 230 suck and hold the lower surface of the polarizing plate 4d firmly. Thus, the liquid crystal display panel 19 is securely held by the support surface 220, the support member 225, and the suction pad 230, and the liquid crystal display panel 19 is held in parallel with the upper surface 210a of the base 210, that is, with flatness.
[0023]
Next, the suction surface 20 a shown in FIG. 3 of the holding head 20 needs to be parallel to the upper surface of the base 210 of the stage 40.
The vacuum suction source 77 in FIG. 1 is operated to place the holding head 20 in the suction state, and the holding head 20 is positioned in the electronic component supply unit 16. Thereby, the electronic component PA of the electronic component supply unit 16 is attracted to the holding head 20. The holding head 20 that has sucked the electronic component PA images the posture of the electronic component PA with the camera 17 of FIG. Then, the electronic component transport device 13 moves the holding head 20 to the liquid crystal display panel 19 side.
At this time, based on the result of the camera 17 imaging the posture of the electronic component PA, the motor M3 operates to correct the orientation of the electronic component PA. 1 detects an alignment mark (not shown) on the liquid crystal display panel 19 and activates the motor M2 in FIG. 1, so that the electronic component PA is in a predetermined position on the liquid crystal display panel 19. Will be installed. The predetermined position of the liquid crystal display panel 19 is a location near the signal supply electrode portion 61g as shown in FIG.
[0024]
As shown in FIG. 4, when the electronic component PA is electrically connected to each position of the liquid crystal display panel 19, the bump (projection electrode) BP of the electronic component PA is interposed through the anisotropic conductive film ACF. Thus, it is electrically connected to the wiring pattern FP of the circuit portion 4e. In this case, as shown in FIG. 3, the holding head 20 has a heater H, and the heater H heats the holding head 20 by the operation of the heating power supply 130, whereby the electronic component PA is heated and the electronic component PA is heated. As a result, the coating DS of the conductor DT of the anisotropic conductive film ACF is broken, and the conductive particles DT electrically connect the bumps BP of the electronic component PA and the wiring pattern FP of the circuit board 4e. can do.
As described above, the electronic component PA is heated and pressurized (thermocompression bonding) with respect to the circuit portion 4e. Even in this case, the liquid crystal display panel 19 is supported as shown in FIGS. Since the surface 220, the support member 225, and the suction pad 230 are elastically supported and fixed, and the flatness is also maintained, the electronic component PA is securely fixed to the circuit portion 4e to achieve electrical connection. be able to.
[0025]
By the way, after the electronic component PA1 of FIG. 4 is mounted on the circuit portion 4e in the relatively small area of FIG. 5, next, two electronic components PA2 and PA3 are attached to the circuit portion 4e on the relatively wide side of FIG. Installing.
In this case, the liquid crystal display panel 19 changes its orientation from the state of FIG. 5 to the state of FIG. That is, the operation of the vacuum suction source 77 is temporarily stopped, the suction of the suction pad 230 is released, and the direction of the liquid crystal display panel 19 is turned 90 degrees counterclockwise. That is, a relatively wide circuit portion 4e is supported on the support surface 220 by surface contact, and another end of the polarizing plate 4d is supported by linear contact by the support member 225. In this state, the vacuum suction source 77 is activated again, and the suction pad 230 can elastically suck the lower surface of the polarizing plate 4d.
[0026]
By the way, the hose 239 of the suction means 216 can be easily connected to the vacuum suction source 77 by passing the hole 225h of the support member 225 as shown in FIGS.
Further, according to the size of the liquid crystal display panel 19, the position of the second support unit 214 and the position of the suction unit 216 can be shifted and fixed again on the upper surface 210 a of the base 210.
[0027]
Next, another embodiment of the object holding device of the present invention will be described with reference to FIGS.
The stage 440 as the object holding device of FIGS. 11 to 13 includes a base 210, first support means 412, second support means 414, and suction means 416.
The first support means 412 is the same as the first support means 212 of FIG. 5 and is made of a transparent body such as quartz glass. The second support means 414 has the same structure as the second support means 214 of FIG.
[0028]
However, the suction means 416 is different in structure from the suction means 216 in FIG. The suction means 416 includes a suction portion 417, a fixing member 418, a spring 419, and the like. The suction portion 417 has a plurality of suction holes 417a. The suction hole 417a is connected to a vacuum suction source 77, and when the vacuum suction source 77 is activated, the suction portion 417 can elastically suck the lower portion of the polarizing plate 4d of the liquid crystal display panel 19. A characteristic point of the adsorption part 417 is that its width L2 is smaller than its length L1. The longitudinal direction of the suction portion 417 is arranged in a direction orthogonal to the directions of the first support means 412 and the second support means 414. By doing in this way, there exists an effect that the upper surface of the adsorption | suction means 416 can perform the adsorption | suction of surfaces smoothly when adsorb | sucking the lower surface of the polarizing plate 4d of the liquid crystal display panel 19. FIG.
[0029]
Returning to FIG. 12, the suction portion 417 is elastically supported by the fixing member 418 via the spring 419. In addition, the fixing member 418 includes a guide 430, and the suction portion 417 can be guided in the Z direction against the spring force of the spring 419 by the guides 430 and 430. The fixing member 418 can be fixed to the base 210 with screws or the like, moved and positioned, and fixed again.
[0030]
By the way, the present invention is not limited to the above embodiment.
In the embodiment described above, a driving IC (driver IC) for a liquid crystal display panel is used as an electronic component, and the object is a liquid crystal display panel. However, the present invention is not limited to this, and the object holding device of the present invention can also be applied when other electronic components are mounted on other types of objects.
[0031]
【The invention's effect】
As described above, according to the present invention, it is possible to reliably hold an object such as a liquid crystal display panel with flatness.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a preferred embodiment of a component mounting apparatus including an object holding device of the present invention.
2 is an enlarged perspective view showing the vicinity of an object holding device of the component mounting device of FIG. 1;
FIG. 3 is an enlarged block diagram showing the vicinity of the object holding device.
FIG. 4 is a perspective view showing an example of a liquid crystal display panel that is an object.
FIG. 5 is a perspective view showing an object holding device holding a liquid crystal display panel with flatness.
FIG. 6 is a diagram showing a state in which the holding direction of the liquid crystal display panel is changed.
FIG. 7 is a perspective view showing an example of a suction unit.
FIG. 8 is a perspective view showing an example of second support means.
FIG. 9 is a side view of a liquid crystal display panel showing a state of being held by an object holding device.
FIG. 10 is a side view showing second support means.
FIG. 11 is a side view showing another embodiment of the object holding device of the present invention.
12 is an enlarged side view showing the object holding device of FIG.
13 is a plan view showing a part of the object holding device in FIG. 12. FIG.
14 is a perspective view showing the suction means of FIG. 12. FIG.
FIG. 15 is a cross-sectional view showing an example of a conventional object holding device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 19 ... Liquid crystal display panel (object), 40 ... Stage (object holding device), 210 ... Base, 212 ... 1st support means, 214 ... 2nd support means 230 ... Adsorption means

Claims (4)

In an object holding device for holding an object that needs to be held with flatness,
The base,
A first support means provided on the base for supporting the one end of the surface of the object in surface contact;
Provided on the base, a second support means for supporting contacts the other end of the one surface of said object to a linear,
The position between the one end and the other end of the one surface of said object, and a suction means for holding elastically removably adsorption,
The second support means fixes the other end of one surface of the object in a linear manner and supports the same in a linear shape, and fixes the position of the support member on the base in a changeable manner. An object holding device comprising: a fixing member .   The object holding device according to claim 1, wherein the object is a liquid crystal display panel.   The object holding device according to claim 1, wherein the suction unit includes a suction pad for adhering and sucking an object and a vacuum suction source for sucking the object with the suction pad.   The object holding device according to claim 1, wherein the base can be moved and positioned along at least one axis in order to move the object.

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