JPH085335A - Retention position detector of electronic parts - Google Patents

Abstract

PURPOSE:To improve a lighting device for detecting the retention position of electronic parts which are sucked at the tip of the suction pipe of a retention tool by acquiring a projection image. CONSTITUTION:Ultraviolet rays are applied to a light emitting plate 66 via a filter 92 from a ring lamp 90 being provided around a camera 88. The light emitting plate 66 absorbs ultraviolet rays and discharges visible light and applies light to electronic parts 80 being sucked at the tip of a suction pipe 78 from the rear. Ultraviolet rays are also applied to the electronic parts 80 and are reflected toward a camera 88 but are prevented from entering the camera 88 by a filter 94, thus obtaining a complete projection image of the electronic parts 80 and avoiding the deterioration in the retention position detection accuracy due to partial lighting of the image of the electronic parts 80. Light applied to the light emitting plate 66 is not limited to ultraviolet rays. The light emitting plate 66 discharges light with different wavelength from that of incident light and the camera 88 is exposed to only light which is discharged by the light emitting plate 66.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for detecting the position of an electronic component with respect to the holder by emitting light to the electronic component held by the holder and capturing a projected image of the electronic component. In particular, it relates to facilitation of detection.

[0002]

2. Description of the Related Art Position detecting devices of this type are already known. As one of them, there is one in which a projection image obtained by reflecting the light emitted from the light-emitting body toward the electronic component by the reflection plate is captured by the imaging device. In this device, the reflector and the image pickup device are provided at positions opposite to each other with the electronic component sandwiched therebetween, and the light-emitting body is provided on the same side as the image pickup device and emits light toward the reflector plate. ing. In such a device, if the light emitted from the light emitter directly hits the electronic component and the reflected light is emitted to the image pickup device, the projected image is disturbed and the detection accuracy is lowered. The light emitted from the body is prevented from hitting the electronic components.

[0003]

However, if the size of the electronic component changes, it is necessary to replace the shield plate accordingly. When shining light on an electronic component to obtain a projected image, the shield plate allows the light from the light emitter to directly impinge on the electronic component so that the reflector also reflects the light inside the outer edge of the electronic component. It is necessary to prevent the light from the light-emitting body from arriving at a portion closer to the holder of the reflection plate as the electronic component is smaller, as well as to prevent the light from reaching. However, with a shield plate for large electronic components, the light emitted from the light-emitting body is only radiated to a position away from the holder of the reflector, and the amount of reflected light is insufficient when the electronic component is small, while for small electronic components. The shielding plate of 2 cannot sufficiently prevent the light of the light emitter from directly reaching large electronic components. Therefore, it is necessary to provide a shield plate suitable for the size of each electronic component, but it is troublesome to replace the shield plate each time the size of the electronic component is changed. This is necessary and increases the equipment cost. It is an object of the present invention to provide a detection device that can reliably detect the holding position of an electronic component regardless of changes in the size of the electronic component.

[0004]

In order to solve the above-mentioned problems, the present invention provides a holding position detecting device for electronic parts,
(A) a first light emitter that emits light toward the vicinity of the electronic component held by the holder, and (b) a light emitter that is provided close to the holder and absorbs the light emitted from the first light emitter. A second light emitter that emits light having a wavelength different from that of the light toward the electronic component, and (c) is provided on the opposite side of the electronic component from the second light emitter and is emitted from the first light emitter. The present invention includes an image pickup device which is not exposed to light and which picks up a projected image of an electronic component by the light emitted from the second light emitter. It should be noted that the light here is light in a broad sense including not only visible light but also infrared rays, ultraviolet rays, X-rays, γ-rays and the like.

[0005]

In the holding position detecting device configured as described above, the image pickup device captures a projected image by the light emitted by the second light emitter, but it is not sensitive to the light emitted by the first light emitter, and therefore the electronic parts and Even if the light emitted by the first light emitter hits the peripheral device and is reflected toward the imaging device, or the light of the first light emitter reaches the imaging device directly,
The projected image is not affected by those lights, and a clear projected image without disturbance can be obtained.

[0006]

As described above, according to the holding position detecting apparatus of the present invention, the light emitted by the first light emitter does not affect the projected image of the electronic component without providing the shield plate, and the shield image is shielded. It is possible to obtain a holding position detecting device that can easily and accurately detect the holding position of the electronic component by the holder without the need to install or replace the plate.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a diagram showing an electronic component holding device for holding an electronic component to mount it on a printed circuit board. In the figure, reference numeral 8 is a frame, and an XY table 10 is attached to the frame 8 which is movable in the X direction and the Y direction which are orthogonal to each other in a horizontal plane. The table 10 is driven by a servo motor or the like, and is positioned with high precision at an arbitrary position within a horizontal plane. Further, the table 10 is provided with a linear slide 12 which is vertically moved by a driving device (not shown), and a holder 14 is fixed to the linear slide 12. The holder 14 includes an arm portion 16 that extends horizontally from the lower end portion thereof, and a cylindrical member 18 is supported by the arm portion 16 via a sleeve 20 so as to be rotatable around a vertical axis.

The tubular member 18 has a stepped shape and has a small diameter portion 2
6 is movably fitted to the sleeve 20 in the axial direction, and is engaged with an engagement protrusion 32 provided at the upper end of the sleeve 20 in an engagement hole 30 provided in the large diameter portion 28. The rotation with respect to the sleeve 20 is prevented. Further, an air passage 34 is formed in the tubular member 18 so as to penetrate through the central portion thereof in the axial direction, and a nut 36 is fixed to the upper end portion. A connection fitting 40 of a rubber vacuum hose 38 is screwed onto the nut 36,
Thereby, the tubular member 18 is connected to a vacuum source (not shown). A compression coil spring 46 is disposed between the sleeve 20 and the end of the tubular member 18 protruding from the sleeve 20, whereby the large-diameter portion 28 of the tubular member 18 contacts the upper surface of the sleeve 20. Has been made.

A large-diameter gear 50 is integrally provided on the upper portion of the sleeve 20 projecting from the arm portion 16, and is meshed with a small-diameter gear 52 rotatably supported by the arm portion 16. A medium-diameter gear 54 is fixed to the small-diameter gear 52, and the medium-diameter gear 54 meshes with a drive gear 58. The drive gear 58 is rotated by a servo motor 60 attached to the linear slide 12 by a bracket 59. As a result, the large diameter gear 50 is rotated via the medium diameter gear 54 and the small diameter gear 52, and the tubular member 18 is rotated together with the sleeve 20.

Further, an outward flange portion 64 is provided at a lower end portion of the cylindrical member 18 protruding from the sleeve 20, and a light emitting plate 66 is fixed by a screw 68. The light emitting plate 66 has a plate-like shape, and includes a main body 70 fixed to the flange portion 64, and a light emitting layer 72 formed by applying fluorescent paint to the lower surface of the main body 70. The light emitting plate 66 has an air passage 74 penetrating therethrough in the thickness direction and concentric with the air passage 34 formed in the tubular member 18.
One end of the air passage 74 is opened at the center of the surface of the light emitting layer 72, and the other end is connected to the vacuum source via the air passage 34. A metal adsorption tube 78 having excellent wear resistance is press-fitted on the side of the air passage 74 that opens to the surface of the light emitting layer 72. The adsorption tube 78 is thinner than the electronic component 80, and a fluorescent paint is applied to the surface of the adsorption tube 78 together with the lower surface of the main body 70 to form a light emitting layer 82. The adsorption pipe 78 adsorbs or releases the electronic component 80 in accordance with switching of the electromagnetic directional control valve provided in the vacuum source.

The frame 8 has an image pickup device 84.
Is attached. This imaging device 84 has a lens 86
And a camera 88, and the suction pipe 78 is positioned directly above the image pickup device 84.
It is provided so as to face the light emitting plate 66 with the electronic component 80 held in between. Lens 8 of imaging device 84
A ring lamp 90, which is a first luminous body, is provided around 6 and is attached to the frame 8 via a bracket (not shown). The ring lamp 90 emits ultraviolet rays, and a ring-shaped first filter 92 that allows only the transmission of ultraviolet rays is provided on the side facing the light emitting plate 66, and is supported by the bracket. Therefore, the light emitting plate 66 is irradiated with only ultraviolet rays, and the light emitting layers 72 and 82 formed by applying the fluorescent paint absorb the ultraviolet rays and emit visible light. The wavelength of the light emitted to the light emitting plate 66 and the wavelength of the light emitted from the light emitting plate 66 are different from each other. Further, in the image pickup device 84, a second filter 94 is provided at a position close to the lens 86 and facing the electronic component 80 and supported by a bracket that supports the first filter 92. The second filter 94 absorbs ultraviolet rays and allows visible light to pass therethrough.
Only visible light emitted by 2, 82 will enter.

The electronic component holder configured as described above receives the electronic component 80 from the component supply device and mounts it on the printed circuit board. The image pickup device 84 is provided between the component receiving position and the mounting position. The electronic component 80 is provided and the holding position error of the electronic component 80 detected by the imaging device 84 is corrected, and then the electronic component 80 is mounted on the printed circuit board. When the electronic component 80 is received, the linear slide 12 is lowered while the suction pipe 78 is positioned on the electronic component 80 to be received in the component supply device, and the suction pipe 78 is brought into contact with the upper surface of the electronic component 80. . Although the suction pipe 78 is slightly lowered even after the contact, the suction pipe 78 compresses the compression coil spring 46 and moves with respect to the sleeve 20, whereby damage to the electronic component 80 and the suction pipe 78 is avoided. In this state, the suction pipe 78 is communicated with the vacuum source to suck the electronic component 80.

After that, the linear slide 12 is raised, the XY table 10 is moved, and the suction tube 78 is positioned right above the image pickup device 84. Then, of the light emitted from the ring lamp 90, only ultraviolet rays pass through the first filter 92 and are emitted toward the light emitting plate 66.
As a result, the light emitting layers 72 and 82 absorb the ultraviolet light and radiate visible light toward the electronic component 80, and the lens 86
After entering the electronic device 80, the electronic component 80
The projected image of is formed. At this time, the ultraviolet light emitted from the ring lamp 90 hits the electronic component 80 and peripheral devices, and the reflected light is directed to the image pickup device 84. However, the second filter 94 absorbs the ultraviolet light, so the light emitted from the light emitting plate 66 is electronic. A clear projection image is formed without being affected by reflected light from the component 80 and the like. The imaging device 84 converts this projection image into a binarized signal and outputs it to a control device (not shown). The control device compares the binarized signal with the binarized signal indicating the position of the regular electronic component 80 stored in advance in the memory of the control device itself, and determines the angular error Δθ about the center line of the electronic component 80. The center position errors ΔX and ΔY are calculated.

After the component position is detected in this way, the electronic component 80 is moved to the mounting position. At this time, the electronic component 80 is moved so as to eliminate the center position errors ΔX and ΔY, and During the movement, the servo motor 60 is driven, and the suction pipe 78 is rotated so that the suction pipe 78 is rotated by an angle necessary to eliminate the angle error Δθ. Therefore, in the state where the suction pipe 78 is positioned at the electronic component mounting position, the printed circuit board and the electronic component 80 are in the relative position suitable for mounting, and the linear slide 12 is lowered to the suction pipe 78. The held electronic component 80 is pressed against a predetermined position on the printed board and fixed by adhesion or the like. In that state, the suction pipe 78 is brought into communication with the atmosphere by switching the electromagnetic directional control valve, whereby the electronic component 80 is released, and thereafter, when the suction pipe 78 moves up, the mounting of the electronic component 80 on the printed circuit board is completed.

As described above, in the electronic component holding device of this embodiment, the holding position of the electronic component 80 by the suction tube 78 is detected based on the radiation of light from the ring lamp 90 provided on the image pickup device 84 side. However, since the light is blocked by the second filter 94 and does not enter the image pickup device 84, it is possible to obtain a projection image without disturbance without providing a shield plate,
The holding position of the electronic component 80 can be detected easily and accurately. Further, the surface of the adsorption tube 78 is also coated with the fluorescent paint to form the light emitting layer 82 so as to radiate visible light. Therefore, even if the electronic component 80 has a small size, a clear projection is obtained. An image is formed.

Further, since the light emitting plate 66 emits visible light by emitting ultraviolet rays to the fluorescent paint, like a light emitting body that emits light based on the supply of electricity from a power source,
There is no need to consider avoiding twisting of the electric cord or the like and maintaining the connection when the cylinder member 18 is moved up and down and rotated,
The configuration of the device can be simplified. In addition, the cost is lower than that of a light emitter including a large number of light emitting elements, and the cost of the detection device can be reduced.

In the above embodiment, the light emitting plate 66 was composed of the main body 70 and the light emitting layer 72, but as shown in FIG. 2, acrylic resin or polyacetal resin (for example, Duracon manufactured by DuPont) or the like is used. The light emitting plate 100 may be formed using a material in which a fluorescent paint is mixed in a synthetic resin. An example of such a material is clear color (trade name) manufactured by Takiron Co., Ltd.

Further, in each of the above-mentioned embodiments, the ring lamp 90 is provided around the image pickup device 84 and is arranged on the side opposite to the light emitting plates 66 and 100 with respect to the electronic component 80. Like the ring lamp 104 shown in FIG. 2, the electronic component 80 may be provided on the side opposite to the imaging device 84, and light may be emitted from above the light emitting plate 106. The ring lamp 104 is the same as the ring lamp 90, and is supported by a bracket (not shown) and arranged around the tubular member 18. Also, the light emitting plate 1
Reference numeral 06 denotes a plate-like member, and has a main body 108 fixed to the flange portion 64 of the tubular member 18, and a light emitting layer 110 having a surface facing the ring lamp 104 coated with fluorescent paint. . The main body 108 is made of a semitransparent material that diffuses light, and the suction tube 112 is fixed to the surface of the main body 108 that faces the imaging device 84. Imaging device 84
Is provided with a filter 114 that absorbs ultraviolet rays and allows transmission of light of other wavelengths, as in the case of the above-described embodiment.

In this embodiment, the light emitting layer 110 absorbs the ultraviolet light emitted from the ring lamp 104 and emits visible light. The visible light passes through the main body 108 and is diffused to irradiate the electronic component 80, and the projection image formed by the visible light is captured by the imaging device 84, and the holding position of the electronic component 80 by the suction tube 78 is detected. Ring lamp 104
Is provided on the opposite side of the light emitting plate 106 from the imaging device 84, most of the ultraviolet rays emitted by the ring lamp 104 are absorbed by the light emitting layer 110, and the projected image is hardly affected. However, the ultraviolet rays that hit the peripheral devices are reflected toward the image pickup device 84, or the light emitting plate 106 is replaced when the size of the electronic component 80 is changed. Light passes over the light emitting plate 106 and the image pickup device 84
There is a possibility that it will be radiated to. Therefore, the filter 114 is provided so that most of the light is absorbed by the filter 114 and the projected image of the electronic component 80 is less likely to be affected.

The main body 108 of the light emitting plate 106 may be transparent. Also in this embodiment, a filter that absorbs visible light emitted from the ring lamp 104 together with ultraviolet rays may be provided. Further, in each of the above embodiments, the first light emitter is provided on the upper side or the lower side of the electronic component 80, but from the side different from the electronic component 80, obliquely upward or diagonally downward, etc. You may provide in the position which radiates light. In this case, if the light of the first light emitter is emitted to the image pickup device or the electronic component, a filter is provided to remove the light of the same wavelength as the light emitted by the second light emitter.

Furthermore, in each of the above-mentioned embodiments, the first light emitter emits ultraviolet rays and the second light emitter emits visible light. However, other than that, it emits light of different wavelengths. Alternatively, a filter may be appropriately provided according to the wavelength. For example, the first light emitter emits infrared light, and the second light emitter absorbs infrared light and emits visible light. Further, the first and second light emitters may emit visible light having different wavelengths.

Furthermore, it is not essential to provide a filter on the first light emitter and the image pickup device, and the filter can be omitted if the first light emitter emits only light of a specific wavelength. The filter can be omitted if it is not sensitive to the light emitted by the first light emitter and is itself sensitive to the light emitted by the second light emitter.

Furthermore, in each of the above-mentioned embodiments, the second light-emitting body has a flat plate shape, but it is also possible to have a tapered tubular shape or the like, and the electronic component can be moved by moving the tubular member in a direction other than the vertical direction. When it is held, the second light emitter may be inclined. In any case, the first light emitter may be provided in a direction that emits light to the second light emitter, and should have a shape suitable for emitting light to the second light emitter other than the ring shape. You can also The light emitted by the first light emitter and the light emitted by the second light emitter have different wavelengths so that the projected image is not affected by the light of the first light emitter. Therefore, the position of the first light emitter can be set to the position where the second light emitter uniformly and efficiently emits light to the electronic component. Therefore, when the present invention is applied to a holding position detection device such as an electronic component holding device having a plurality of suction tubes, the installation position of the first light emitter is not limited, and the second light emitter of the second light emitter is uniformly applied to all electronic components. It is possible to irradiate light and obtain a highly accurate projected image.

In each of the above embodiments, the light emitting plate 66,
Although 100 and 106 are supposed to hold the adsorption tubes 78 and 112, respectively, so that light can be emitted from a position extremely close to the electronic component 80, the adsorption tube 7
It may be provided separately from 8, 112 and attached to the arm portion 16 or the like. In addition, although not exemplified, the present invention can be implemented in various modified and improved modes based on the knowledge of those skilled in the art.

[Brief description of drawings]

FIG. 1 is a front view (partial cross section) showing an electronic component holding device including a holding position detection device according to an embodiment of the present invention.

FIG. 2 is a front cross-sectional view showing another aspect of a second light emitter that constitutes the holding position detection device.

FIG. 3 is a front view (partial cross section) showing an electronic component holding device including a holding position detection device according to still another embodiment of the present invention.
Is.

[Explanation of symbols]

 66: Light emitting plate 78: Adsorption tube 80: Electronic component 84: Imaging device 90: Ring lamp 92: First filter 94: Second filter 100: Light emitting plate 104: Ring lamp 106: Light emitting plate 112: Adsorption tube 114: Filter

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinsuke Suhara 19 Chasuyama, Yamamachi, Chiryu-shi, Aichi Fuji Machinery Manufacturing Co., Ltd. Fuji Machine Manufacturing Co., Ltd.

Claims (1)

[Claims] 1. A first light emitter that emits light toward the vicinity of an electronic component held by a holder, and a light that is provided in the vicinity of the holder and absorbs the light emitted from the first light emitter. And a second light emitter that emits light having a wavelength different from that of the light toward the electronic component, and the second light emitter is provided on the opposite side of the electronic component from the first light emitter. It is not sensitive to the emitted light,
An electronic device holding position detection device, comprising: an imaging device that captures a projected image of the electronic component by light emitted from the second light emitter.