JPH0244560Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to an electronic component holding device, and particularly relates to a holding device having a function of detecting the holding position of an electronic component.

2. Description of the Related Art An electronic component holding device that holds an electronic component and has a detection function for detecting the holding position of the electronic component is already known. An example of such an electronic component holding device is disclosed in Japanese Patent Application Laid-Open No. 167803/1983. This device is configured to include a suction head that suctions electronic components using a vacuum, a light projector that emits light onto the sucked electronic components, and an imaging device that captures a projected image of the electronic components using light.
The suction head has a head body and a suction tube attached to the head body. Two transparent plates forming a space substantially airtight inside the member, a connecting passage formed in the cylindrical member to connect the space to the vacuum source, and a connecting passage formed in one of the two transparent plates to connect the space to the vacuum source. The suction tube includes a through hole formed to extend through the suction tube in the horizontal direction, and the proximal end of the suction tube is inserted into the through hole and fixed. Further, the light projector projects light parallel to the center line of the suction tube, and illuminates the electronic components through two transparent plates.

In this device, the suction tube is connected to a vacuum source through an airtight space and a connection passage provided in the cylindrical member to suction the electronic components, and in this state, light is emitted from the projector.
Applies to electronic components. The projected image thus formed is captured by an imaging device, and the holding position of the electronic component is detected.The position of many types of electronic components can be accurately determined without being affected by the roughness or color of the surface of the electronic component. and can be easily detected.

Problems to be solved by the invention However, in the above device, the range of light that is applied to electronic components is regulated by the size of the transparent plate, which limits the size and type of electronic components that can be held. It was hot. Enlarge the head body,
It would be possible to make the transparent plate larger, but this would result in an undesirably large device.

In addition, when electronic components are attracted, dust, etc. are sucked together with air, enter the space inside the cylinder member, and inevitably adhere to the transparent plate, and light shines on the electronic components through the attached dust. As a result, the formation of an accurate projected image is hindered and cleaning work becomes necessary.

Furthermore, in order to project light parallel to the center line of the suction tube, it is necessary to use a fiber or the like, which poses a problem in that the projector becomes complicated and expensive.

Means for Solving the Problems In order to solve the above problems, the present invention provides (a)
(b) a suction tube extending from the main body and sucking electronic components at a distal end surface with a vacuum; (c) a floodlight that shines light from one direction onto the electronic components held by the suction tube; (d)
In an electronic component holding device that includes an imaging device that captures a projected image of the electronic component using the light, the projector has a light projecting surface that projects uniform light throughout the projector, and a projector that penetrates the projector. This is an extended adsorption tube.

Functions and Effects In this way, the light emitted from the light projector is directly applied to the electronic components, and there is nothing to restrict the irradiation of the light to the electronic components. Therefore, unlike when light is applied through a transparent plate, the range of light applied to electronic components is no longer restricted by the size of the transparent plate, increasing the size and types of electronic components that can be held. At the same time, the formation of an accurate projected image is no longer hindered by dust adhering to the transparent plate, and cleaning work is no longer necessary.

Furthermore, the projector only needs to emit light uniformly over its entire projection surface, has a simpler structure than a projector constructed of fibers, and can be constructed at low cost using commercially available products. .

Note that since the projector itself is a light source that emits light, a reflective surface is provided, the light emitted from the light source is directed onto the reflective surface, and the light reflected from the reflective surface is directed onto the electronic components to detect the position. Superior effects can be obtained compared to the case of

For example, since a reflective surface cannot emit light on its own, it must be installed together with a light source, which complicates the equipment and increases costs. The light also strikes and reflects on the supporting members and surrounding members, and a projected image is also formed by the reflected light from them, which may prevent the formation of a clear projected image of the electronic component.

In order to avoid light hitting components other than electronic components, the direction of the light irradiation from the light source should be as close to a right angle as possible to the reflective surface.
If this is done, the range of light reflected from the reflective surface becomes narrow, resulting in a problem that the size and type of electronic components whose position can be detected are limited. Furthermore, there is also the problem that the directionality of the light is affected by the reflective surface, making it difficult to reliably illuminate electronic components.

On the other hand, if a projector that is itself a light source is used to directly illuminate the electronic components, the cost will not be high as would be the case if a reflective surface is provided along with the light source. Light does not hit the peripheral parts of the suction tube, making it possible to obtain an accurate projected image of the electronic component. Furthermore, it is easy to determine the directionality of the light, and electronic components can be reliably irradiated with light.

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

The attached drawing shows an embodiment of the present invention for mounting electronic components on a printed circuit board. In the figure, reference numeral 8 denotes a frame, and an X-Y table 10 is attached to the frame 8, which can be moved in the X direction and the Y direction, which are perpendicular to each other in a horizontal plane. This table 10 is driven by a servo motor or the like, and is positioned with high precision at any position within a horizontal plane. Further, the table 10 is provided with a linear slide 12 that is moved in the vertical direction by a drive device (not shown), and the suction tube holder 1 is mounted on the linear slide 12.
4 is fixed. The suction tube holder 14 includes an arm portion 16 extending horizontally from its lower end, and a suction tube 18 is rotatably supported by the arm portion 16 via a sleeve 20 around a vertical axis.

The suction tube 18 consists of a main body 22 and a nozzle 24 that is integrally fitted into the main body 22. Main body 2
2 has a stepped shape, and is fitted into the sleeve 20 at the small diameter portion 26 so as to be movable in the axial direction, and is provided at the upper end of the sleeve 20 at the engagement hole 30 provided at the large diameter portion 28. engaging protrusion 32
, and rotation with respect to the sleeve 20 is prevented. Further, the nozzle 24 has a stepped shape, and an air passage 34 is formed in the center thereof. The upper end of the nozzle 24 has a male thread, into which a nut 36 is screwed. The nozzle 24 is integrally connected to the main body 22 by screwing the nut 36 into the nozzle 24 so that the end surface of the large diameter portion comes into contact with the shoulder surface of the main body 22.

A rubber vacuum hose 38 is attached to the nut 36.
A connecting fitting 40 is screwed together, thereby connecting the nozzle 24 to a vacuum source (not shown). The vacuum source is provided with an electromagnetic directional switching valve, and as the valve is switched, the nozzle 24 attracts and releases the electronic component 44 at the suction portion 42 at its tip. Note that a compression coil spring 46 is disposed between the sleeve 20 and the lower end of the main body 22, so that the large diameter portion 28 of the main body 22
is brought into contact with the upper surface of the sleeve 20.

Further, a large-diameter gear 50 is integrally provided at 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 this small diameter gear 52,
The medium diameter gear 54 is meshed 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 suction tube 18 is rotated together with the sleeve 20.

Further, a projector 66 is attached to the lower surface of the arm portion 16 by a plurality of brackets 64. The projector 66 is made up of a light emitter 68 and a diffuser plate 70 fixed to it, and is larger than the electronic component 44. The light emitter 68 has a plurality of light emitting elements 74 embedded in a block 72 at regular intervals.The light emitted by the light emitter 68 is diffused by a diffuser plate 70, and the entire end surface 76 of the diffuser plate 70 is diffused. The light is emitted uniformly from the The end surface 76 is a light projection surface. A through hole 78 extending in the thickness direction is formed in the center of the projector 66, and the protruding end of the nozzle 24 from the main body 22 is slidably inserted into the through hole 78. It passes through the floodlight 66 through the hole 78 and attaches to the suction part 4.
2 is located in front of the projector 66.

Furthermore, an imaging device 80 is attached to the frame 8 . In this imaging device 80, when the suction tube 18 is positioned directly above the imaging device 80, the electronic component 44 held by the suction tube 18 is
The light emitted from the light projector 66 illuminates the electronic component 44 and then enters the imaging device 80 . The imaging device 80 includes a lens, which converts a projected image of the electronic component 44 onto the surface of a solid-state imaging device (not shown) into a binary signal.

The electronic component holding device configured as above is
Receive the electronic component 44 from the component supply device, detect the position of the electronic component 44 using the imaging device 80,
Correct the holding position error and mount it on the printed circuit board.

When receiving electronic components 44, when the suction tube 18 is placed in the component supply device, the linear slide 12 is lowered and the suction tube 18 is positioned over the electronic component 44 to be received in the component supply device. 18 is brought into contact with the upper surface of the electronic component 44. Even after contact, the suction tube 18 is lowered slightly, but the suction tube 18 compresses the compression coil spring 46 and moves relative to the sleeve 20, thereby avoiding damage to the electronic component 44 and the nozzle 24. In this state, the suction tube 18 is communicated with the vacuum device, and the electronic component 44 is suctioned in the suction section 42 .

After that, the linear slide 12 is raised,
The X-Y table 10 is moved and the suction tube 18
is positioned directly above the imaging device 80. Then, light is projected from the light projector 66, and the imaging device 80
A projected image of the electronic component 44 is focused on the surface of the solid-state image sensor. The imaging device 80 converts this projected image into a binary signal and outputs it to a control device (not shown). The control device compares the binary signal with a binary signal indicating the position of the regular electronic component 44 stored in advance in its own memory, and determines the attitude error Δθ and center position error of the electronic component 44. ΔX and ΔY are calculated.

After the component position is detected in this way, the electronic component 44 is moved to the mounting position.
During this time, the servo motor 60 is driven, and the suction tube 1
8 is rotated by an angle necessary to eliminate the attitude error Δθ. Further, the printed circuit board is positioned at a position corrected by the center position errors ΔX and ΔY by the printed circuit board positioning device. Therefore, the adsorption tube 18
When the is positioned at the electronic component mounting position,
The printed circuit board and the electronic component 44 are in relative positions suitable for mounting, and the linear slide 1
2 is lowered, and the electronic component 44 held by the suction tube 18 is pressed against a predetermined position on the printed circuit board and fixed by adhesive or the like. In this state, the electronic component 44 is released by switching the electromagnetic directional control valve to communicate the suction tube 18 with the atmosphere, and then, when the suction tube 18 rises, the mounting of the electronic component 44 on the printed circuit board is completed. do.

In this way, in the electronic component holding device of this embodiment, the nozzle 24 penetrates the light projector 66,
Since the light projected by the light projector 66 can be directly applied to the electronic component 44, an accurate projected image can be obtained, and the position of the electronic component can be accurately detected.

In addition, in the above device, there is sufficient space under the arm section 16, and the projector can be easily replaced depending on the size and type of electronic components, and it is possible to hold many types of electronic components. The location can be detected.

Furthermore, the adsorption tube 18 of the above-mentioned embodiment apparatus may have an air passage inside;
The suction head of the device described in Publication No. 61-167803 can be made smaller than the suction head provided with a transparent plate that transmits light, and the servo motor 60 can also be made small and inexpensive. Can be done.

In the above embodiment, the light projector 66 is made up of a light emitting body 68 and a diffuser plate 70, but any device that emits light uniformly from the entire light projecting surface can be used.

Further, in the above embodiment, the projector 66 was fixed to the arm portion 16, but it may be fixed to the suction tube 18.

Although not illustrated in detail, the present invention can be implemented in various modifications and improvements based on the knowledge of those skilled in the art.

[Brief explanation of drawings]

FIG. 1 is a front view (partially in section) showing an electronic component holding device which is an embodiment of the present invention. 18...Adsorption tube, 44...Electronic parts, 66...
Floodlight, 68... Luminous body, 70... Diffusion plate, 74
...Light emitting element, 76 ... End surface, 78 ... Through hole,
80...Imaging device.

Claims (1)

[Scope of Claim for Utility Model Registration] A main body, a suction tube extending from the main body and sucking electronic components at its distal end surface with a vacuum, and a floodlight that shines light from one direction onto the electronic components held by the suction tube. and an imaging device that captures a projected image of the electronic component by the light, wherein the light projector has a light projecting surface that projects uniform light as a whole, and An electronic component holding device having a holding position detection function, characterized in that the suction tube extends through a projector.