JP2005327969A - Lighting apparatus for image recognition apparatus, surface mounting apparatus, and part testing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting apparatus for an image recognition apparatus with the light color easily changed, the size reduced, and the cost decreased. <P>SOLUTION: A half mirror 41 is installed on the optical axis C of a camera 25, a first light source 42 is provided for projecting light via the half mirror 41 on a positioning mark in a printed circuit board, a second light source 45 is provided for projecting light via a prism 47 arranged around the optical axis C, and they are all accommodated in a housing. The housing comprises a first housing 32 with the camera 25 attached thereto and a second housing 34 detachably attached to the first housing 32. The half mirror 41 is fixed immovably to the first housing 32 and the prism 47 is fixed immovably to the second housing 34. A light source board 35 mounted with the first light source 42 and with the second light source 45 is detachably installed in between the first housing 32 and the second housing 34. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an illumination device for an image recognition device, a surface mounter, and a component inspection device that are disposed between an image recognition camera and an object to be imaged in a surface mounter, for example. It is.

  As a conventional illumination device for this type of image recognition device, for example, there is one disclosed in Patent Document 1. The image recognition apparatus disclosed in Patent Document 1 captures an object to be imaged such as a positioning mark or a circuit pattern provided on a printed wiring board from above the printed wiring board by a camera. A lighting device is attached to the section.

  The illuminating device is disposed between the camera and the printed wiring board so as to be positioned on the optical axis of the camera, and is disposed on a side of the half mirror, and uses the half mirror. A first light source that emits light to the object to be imaged, a second light source that is disposed below the half mirror so as to surround the optical axis, and emits light downward, and the second light source It is comprised by the prism etc. which were arrange | positioned under this. Each of these constituent members is housed in one casing and is supported by the casing.

  Each of the first and second light sources includes a plurality of LEDs. The LED constituting the first light source is mounted with a lead penetrating the side wall of the housing, and the LED constituting the second light source is mounted on the lower surface of the light source substrate extending horizontally in the housing. ing. The prism is for collecting the light of the second light source on the object to be imaged, and is formed in an annular shape and disposed on the same axis as the optical axis of the camera.

  In the illuminating device thus configured, the light from the first light source is reflected by a half mirror to irradiate the object to be imaged along the optical axis of the camera, and the light from the second light source is The object to be imaged is refracted by the prism and irradiated obliquely from above. The camera picks up an image of the object to be picked up by receiving reflected light that is irradiated from these LEDs and reflected by the object to be picked up. At this time, the image recognition device equipped with the conventional illumination device has a case where the color of the object to be imaged is similar to the color of the surface of the printed wiring board adjacent to the object to be imaged, or the surface of the object to be imaged is For example, when it is formed to be a mirror surface and easily reflects light, it may be difficult to capture an image of the object to be captured by the camera.

In such a case, the conventional lighting device turns on one of the first light source and the second light source, or turns on both so that a clear image is captured by the camera. Thus, a configuration has been adopted in which the amount of light applied to the object to be imaged is increased or decreased.
In order to make it easy to recognize an image captured by a camera of this type of image recognition device, the LED is used so that the color of the reflected light reflected by the object to be captured is significantly different from the color of the surface of the printed wiring board. It is effective to change the wavelength (color) of the light, change the color of the prism, or provide a colored filter in the optical path.
In addition, the applicant could not find any prior art documents closely related to the present invention by the time of filing other than the prior art documents specified by the prior art document information described in the present specification. .
JP-A-4-122840 (page 2-3, FIG. 1)

  However, even if the first and second light sources are switched on / off as described above, the shape and position of the object to be imaged cannot be accurately detected from the image captured by the camera. This is because the conventional illumination device clearly distinguishes the image of the imaged object captured by the camera from the background so that the color of the reflected light reflected from the object to be imaged differs greatly from the color of the printed wiring board. This is because it is not possible to exchange LEDs or prisms or to provide filters.

  If the conventional lighting device is disassembled to replace the components in the housing, there is a risk that the LED leads or the wiring of the substrate will be cut, and the housing can be disassembled and assembled without cutting the wiring temporarily. Even if it is possible, the mounting position of the camera must be readjusted because the optical axis path is changed due to the shift of the position of the half mirror. In order to make this adjustment work unnecessary, it is conceivable to use a camera lens having a light source that emits light along the optical axis. However, since such a lens is expensive, the cost increases if this configuration is adopted. In addition, if light cannot be irradiated along the optical axis of a camera, it will become difficult to identify the to-be-photographed object whose surface is a mirror surface by image recognition.

  In order to avoid the above-described problems, conventionally, a mechanism for changing the angle of illumination, a mechanism for switching a plurality of types of LEDs having different light colors, and changing the wavelength of light are changed. Various lighting devices have been devised that have a light source that can be used and a mechanism that can change a plurality of types of filters of different colors and automatically change the angle of the filters. However, such illumination devices are not only large, but also have a complicated structure and are expensive. In addition, since the additional functions described above are used only in special cases, for example, when used in an image recognition device equipped in a head unit of a component transfer device, the above functions are used less frequently. Since the component moves together with the head unit, there arises a problem that the load on the driving device increases.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide an illumination device for an image recognition device that can easily change the color of illumination light while reducing the size and cost. And

In order to achieve this object, an illumination device for an image recognition apparatus according to the present invention includes a first light source that irradiates an object to be imaged with a half mirror provided on the optical axis of the camera, and a periphery of the optical axis. In the illumination device for an image recognition device in which a second light source that emits light by a light collecting member disposed in the housing is housed in the housing, the housing is a first housing to which the camera is attached; A second casing detachably attached to the first casing, and the half mirror is fixed to the first casing, and the condensing member is fixed to the second casing. , And a substrate provided with the first light source and the second light source is detachably sandwiched between the first and second housings.
The condensing member according to the present invention refers to a prism or a member having a function of collecting light received in a wide range so that a range irradiated by a reflecting plate is narrowed.

  An illumination device for an image recognition device according to a second aspect of the present invention is the illumination device for an imaging recognition device according to the first aspect of the present invention, wherein the first light source and the second light source are configured by LEDs. It is mounted on one substrate surface and the other substrate surface of one substrate, and this substrate is formed with a through hole that forms an optical path in a portion corresponding to the optical axis of the camera, and the second housing is attached to the first housing. It is fixed to the first casing by fastening together with the second casing by means of bolts fixed to the casing.

A surface mounter according to a third aspect of the invention irradiates a mounting component with light above the component recognition device by the illumination device for an image recognition device according to the first or second aspect of the invention. is there.
According to a fourth aspect of the present invention, there is provided a surface mounter including the illumination device for an image recognition device according to the first or second aspect of the present invention in a head unit having a suction head, and a printed circuit board. The object is irradiated with light.
A component inspection apparatus according to a fifth aspect of the invention irradiates light on an electronic component to be inspected above the component recognition apparatus by the illumination device for an image recognition apparatus according to the first or second aspect of the invention. Is.

  According to the present invention, the substrate having the first light source and the second light source can be removed from both housings by removing the second housing from the first housing. For this reason, the illuminating device which concerns on this invention can change the color of irradiated light easily by replacing | exchanging the 1st and 2nd light source with the light source from which the color (wavelength) of light differs. Further, since the light collecting member is provided in the second housing, by replacing the second housing with another second housing provided with a light collecting member having a different color, The color of the condensing member can be easily changed. Furthermore, in the illumination device according to the present invention, it is not necessary to remove the half mirror from the first housing when exchanging the light source or the condensing member, so that the position and inclination angle of the half mirror with respect to the camera change. There is nothing. For this reason, the operation | work which adjusts the attachment position of a camera after replacing | exchanging the said both members is unnecessary.

  Therefore, in the illumination device for an image recognition device according to the present invention, one or both of the light source and the condensing member can be quickly and easily replaced with one in which the object to be imaged is clearly imaged. As a result, the image recognition device equipped with the illumination device according to the present invention can accurately detect the shape and position of the object to be picked up from the image picked up by the camera.

Moreover, the illumination device for an image recognition device according to the present invention incorporates one type of light source, as compared with a conventional illumination device that switches and uses a plurality of types of light sources provided in a housing as necessary. Therefore, it can be formed small and lightweight.
Furthermore, the illumination device according to the present invention can be used by replacing a light source and a condensing device manufactured so that appropriate light is irradiated on the object to be imaged, if necessary. There is also an effect that the application range is widened and the versatility is enhanced.

According to the second aspect of the present invention, the first light source that irradiates light to the half mirror from the side and the second light source that irradiates light to the condensing member can be exchanged at the same time. The replacement work can be performed more easily. Since the board can be fixed to the first and second housings without using a dedicated fixing bolt, the board is exclusively used in the case of using a fixing bolt for fixing the board to the housing. Cost can be reduced.
In the illumination device according to the present invention, since the second light source can be arranged so as to surround the through hole for forming the optical path, the light is collected from the light collecting member so that the object to be imaged does not become bright and dark. Irradiation can be performed, and the accuracy of image recognition can be further improved.

According to the third aspect of the present invention, since the illumination device that can accurately detect the shape and position of the mounting component from the image captured by the camera is provided, the mounting component can be placed on the printed wiring board with high accuracy. A surface mounter that can be mounted can be provided.
According to the fourth aspect of the invention, since the illumination device that can accurately detect the shape and position of the object to be picked up from the image picked up by the camera is provided, the positioning mark and the circuit pattern of the printed wiring board are provided. It is possible to provide a surface mounter that can detect with high accuracy and can mount a mounting component on a printed wiring board with high accuracy. Moreover, since the surface mounter according to the present invention is provided with the lighting unit which is reduced in size and weight in the head unit, it is possible to reduce a load when the head unit moves.

  According to the fifth aspect of the invention, since the illumination device that can accurately detect the shape and position of the object to be picked from the image picked up by the camera is provided, the electronic component for inspection is inspected with high accuracy. It is possible to provide a component inspection apparatus that can perform such a process.

Hereinafter, an embodiment of an illumination device for an image recognition apparatus according to the present invention will be described in detail with reference to FIGS. Here, the example which provides the illuminating device which concerns on this invention in the head unit of a surface mounter is shown.
FIG. 1 is a plan view of a surface mounter equipped with a lighting device according to the present invention, FIG. 2 is a front view of the upper portion of the surface mounter, FIG. 3 is a longitudinal sectional view of the lighting device according to the present invention, and FIG. It is sectional drawing which shows the state which the illuminating device which concerns on decomposed | disassembled.

  In these drawings, the reference numeral 1 indicates a surface mounter according to this embodiment. The surface mounter 1 includes a conveyer 4 that conveys a printed wiring board 3 on an upper part of a base 2, and a head unit 5 that will be described later in the left-right direction (hereinafter referred to simply as the X direction) and the X direction in FIG. And a moving device 6 that moves in the orthogonal front-rear direction (hereinafter, this direction is referred to as Y direction). The conveyor 4 is configured to convey the printed wiring board 3 to the left in FIG. 1 and hold it at a work position by a clamping mechanism (not shown). On both sides of the conveyor 4, a tape feeder 7 in which mounting components (not shown) are stored, and mounting components sucked by the suction nozzle 8 (see FIG. 2) are imaged from below by a camera 9. A component recognition device 10 is provided. The component recognition device 10 is attached to a portion between the one tape feeder 7 and the conveyor 4 on the base 2 and lower than the transport surface of the printed wiring board 3 in a state of being directed upward.

  The moving device 6 is movable between a Y-direction moving device 12 having two fixed rails 11 and 11 extending in the Y direction above the conveyor 4 and the fixed rails 11 and 11. And an X-direction moving device 14 having rails 13. The head unit 5 is attached to the X-direction moving device 14. The head unit 5 and the moving device 6 are controlled in moving direction, distance, speed, and the like by a control device (not shown).

The Y-direction moving device 12 moves the movable rail 13 of the X-direction moving device 14 in the Y direction by a ball screw shaft 15 extending along the fixed rail 11 and a Y-axis servo motor 16 that drives the ball screw shaft 15. Reciprocate. The movable rail 13 is fixed to a nut member 15 a of the ball screw shaft 15. The Y-axis servomotor 16 is provided with position detecting means 17 comprising an encoder.
The X-direction moving device 14 reciprocates the head unit 5 in the X direction by a ball screw shaft 18 provided in parallel with the movable rail 13 extending in the X direction and an X-axis servo motor 19 that drives the ball screw shaft 18. Let The X-axis servo motor 19 is provided with position detecting means 20 comprising an encoder.

  As shown in FIG. 2, the head unit 5 is provided with eight suction heads 21 having the suction nozzles 8 at intervals in the X direction. These suction heads 21 are configured to be able to perform a lifting operation and a rotating operation, respectively. Further, an image recognition device 23 having an illumination device 22 according to the present invention is provided on one side of the head unit 5.

The image recognition device 23 is for imaging a positioning mark 24 (see FIG. 1) provided on the printed wiring board 3 from above. A camera 25 having a CCD solid-state imaging device (not shown), The illumination device 22 is attached to the lower end of the camera 25. The positioning mark 24 constitutes an object to be imaged according to the present invention.
The camera 25 is attached to one side of the head unit 5 via a mounting bracket (not shown) with the optical axis pointing downward.

  As shown in FIGS. 3 and 4, the illumination device 22 includes a first housing 32 attached to a lower end portion of the camera 25 via an attachment stay 31, and a lower end of the first housing 32. It comprises a second housing 34 detachably attached to the part by a fixing bolt 33, a light source substrate 35 sandwiched between these housings 32 and 34, and the like. The stay 31 has an L-shaped cross section, and a hole 31b serving as an optical path is formed in a horizontal extending portion 31a to which the upper end portion of the first housing 32 is attached.

  The first casing 32 is molded into a box shape with plastic, and an upper opening space 36 and a lower opening space 37 that form an optical path are formed therein. The upper opening space 36 is formed so as to penetrate the first casing 32 in the vertical direction along the optical axis C of the camera 25. The lower opening space 37 is formed to extend horizontally from the upper opening space 36 in the first housing 32 (rightward in FIGS. 3 and 4). A half mirror 41 is provided in a state where the half mirror 41 is inclined by 45 ° at a portion where the vertical hole 26 and the lower opening space 37 intersect in the first housing 32.

  The half mirror 41 reflects the light of the first light source 42 located in the end of the lower opening space 37 downward and allows the reflected light from below to pass upward. Both ends in the direction orthogonal to the paper surface) are fixed in a state where they are supported by the support seat 43 of the first housing 32.

  The light source substrate 35 is formed in a shape overlapping the first casing 32 when viewed from above, and a through hole 44 constituting a part of the optical path is formed at a portion where the optical axis C of the camera 25 intersects. The first light source 42 is mounted on one side of one substrate surface (upper surface), and the second light source 45 is mounted around the through hole 44 on the other substrate surface (lower surface). Yes. A power supply connector 46 is mounted on the lower surface of the light source substrate 35 below the first light source 42. The connector 46 is configured such that a cable (not shown) is detachable from the side.

The first light source 42 includes a plurality of LEDs 42 a in which the light irradiation direction is directed to the half mirror 41. Two of these LEDs 42 a are arranged in the vertical direction, and two are arranged in a direction orthogonal to the paper surface of FIGS. 3 and 4, and are accommodated in a case 46 provided on the light source substrate 35.
The second light source 45 is composed of a plurality of LEDs 45a and 45b whose light is directed downward. The LEDs 45 a and 45 b of the second light source 45 are positioned so that two circles of LED rows are formed concentrically around the through hole 44 of the light source substrate 35. The inner circle of the double circle is formed by the LED 45a, and the outer circle is formed by the LED 45b.

Thus, the light source substrate 35 on which the first and second light sources 42 and 45 are mounted has an upper surface in contact with the lower surface of the first housing 32 and a lower surface of the second housing 34 described later. The first casing 32 and the second casing 34 are sandwiched between the first casing 32 and the second casing 34.
The light source substrate 35 is formed of a plurality of types having different colors (wavelengths) of light emitted from the first and second light sources 42 and 45, and the one having the best imaging state is the first and second ones. It is assembled to the casings 32 and 34.

The second casing 34 is made of plastic and has a box shape in which an upper opening space 34a and a through space 34b are provided, and a prism 47 is provided inside the through space 34b. It is fixed to the first casing 32 by four fixing bolts 33 penetrating the columnar portion 48 in the casing excluding the gap. The prism 47 is positioned by abutting against a stopper 34c formed in an eaves shape.
The prism 47 is for collecting the light of the LEDs 45a and 45b of the second light source 45 on the optical axis C side of the camera 25 and irradiating the positioning mark 24 obliquely from above. The second casing 34 is fixed in the circular hole 50 so as to be positioned on the same axis as the optical axis C of the camera 25. The prism 47 according to this embodiment is made of transparent plastic. The prism 47 constitutes a condensing member in the present invention.

A cutout 51 is formed on one side wall of the second housing 34 for passing a cable connected to the connector 46 of the light source substrate 35.
The fixing bolt 33 penetrates the columnar portion 48 and the light source substrate 35 and is screwed to a nut 52 embedded in the first housing 32. In other words, the light source substrate 35 and the second casing 34 are fixed to the first casing 32 by tightening the fixing bolts 33 to the nut 52 of the first casing 32. The
A plurality of types of the second casing 34 having different colors of the prisms 47 are formed, and the one that obtains the best image during imaging is assembled to the first casing 32 together with the light source substrate 35.

As shown in FIG. 3, the image recognition device illumination device 22 configured as described above is used in a state of being attached to the lower end portion of the camera 25 via an attachment stay 31. When the illumination device 22 is attached to the camera 25, the position of the illumination device 22 is adjusted with respect to the camera 25 so that the refraction of the optical path by the half mirror 41 is offset.
In order to image the positioning mark 24 of the printed wiring board 3 by the image recognition device 23 equipped with the illumination device 22, the head unit 5 is moved in the X direction and the Y direction, and the camera 25 is moved to the printed wiring board 3. Positioned above the positioning mark 24, the first light source 42 and the second light source 45 of the illumination device 22 are caused to emit light.

  The light from the first light source 42 travels in the lateral direction in the first housing 32, is reflected by the half mirror 41, the lower end portion of the upper opening space 36 of the first housing 32, and the light source substrate 35. The positioning mark 24 is illuminated from directly above through the through hole 44 and the through hole 49 of the prism. On the other hand, the light from the second light source 45 is irradiated onto the prism 47 from above, and the traveling direction is changed so as to approach the optical axis C of the camera 25 when passing through the prism 47, so that the positioning mark 24 is inclined. Illuminate from above. The image recognition device 23 images the positioning mark 24 by the camera 25 when the positioning mark 24 is thus irradiated with light from directly above and obliquely upward.

  The image picked up by the camera 25 is the one in which the positioning mark 24 appears in the background consisting of the surface of the printed wiring board 3. For this reason, even when the color of the positioning mark 24 is similar to the color of the surface of the printed wiring board 3 or the color is different, the surface of the positioning mark 24 is, for example, a mirror surface. The positioning mark 24 in the image tends to be unclear.

  In such a case, the illuminating device 22 includes another light source substrate in which the second casing 34 and the light source substrate 35 have different emission colors, and another second housing having a prism 47 in different colors. It is exchanged for the body. In this case, in order to obtain a good image after imaging, it is possible to replace only the light source substrate 35 or replace only the second housing 34. In the replacement operation, the four fixing bolts 33 are removed, the second casing 34 and the light source substrate 35 are removed downward from the first casing 32, and instead of these members, other light sources are used. This is done by attaching the substrate 35 and the other second casing 34 to the first casing 32 with the fixing bolts 33.

  Thus, by replacing the light source substrate 35 with ones having different light colors (wavelengths) from the first and second light sources 42 and 45, the color of the irradiation light can be easily changed, and the second By replacing the housing 34 with a prism 47 having a different color, the color of light applied to the positioning mark 24 can be changed so that the image becomes clearer. Further, when performing this replacement work, it is not necessary to remove the half mirror 41 from the first housing 32, and the position of the half mirror 41 does not change with respect to the camera 25. It is not necessary to adjust the mounting position of the camera 25 after the housing 34 is replaced.

  Therefore, the illumination device 22 for the image recognition device according to this embodiment is faster than the first light source 42, the second light source 45, and one or both of the prisms 47 in which the positioning mark 24 is clearly imaged. And can be easily replaced. As a result, the image recognition device 23 equipped with the illumination device 22 can accurately detect the shape and position of the positioning mark 24 from the image captured by the camera 25.

  In addition, the illumination device 22 according to this embodiment incorporates one type of light source as compared with a conventional illumination device that switches between and uses a plurality of types of light sources provided in the housing as necessary. It can be formed in a small size and can be formed in a light weight. By reducing the weight and weight in this way, the load on the moving device 6 when the head unit 5 moves can be reduced.

  Furthermore, in the illumination device 22 according to this embodiment, another light source substrate or other second housing manufactured so that light of an appropriate wavelength is irradiated onto the positioning mark 24 is replaced as necessary. Therefore, there is an advantage that the range of application for the type of object to be imaged is widened and versatility is enhanced. In other words, the illumination device 22 can be applied to any device as long as it is an image recognition device that detects an object to be imaged by image processing. For example, in a surface mounter, a component recognition device that images a mounting component sucked by a suction nozzle from below, an image recognition device for detecting the position of a printed wiring board conveyed to a solder application dispenser, It can also be used for an image recognition device of a component inspection device that inspects electronic components for inspection by image processing. By using the illumination device of the present invention for the component recognition device of the surface mounter, the mounting component can be mounted on the printed wiring board with high accuracy. Solder dispenser image recognition device can be used to supply solder to printed wiring boards with high accuracy. Component inspection device image recognition device can be used with high accuracy. Can be inspected.

In the above-described embodiment, the example in which the prism 47 is provided in the second housing 34 has been described. However, instead of the prism 47, the light received in a wide range is reflected by the reflecting plate, and the range irradiated with the light is changed. A member having a function of collecting so as to be narrowed can be used.
Moreover, although the example which images the positioning mark 24 of the printed wiring board 3 was shown in the above-described embodiment, the object to be imaged is not limited to the positioning mark 24, for example, for mounting a semiconductor device. It may be a land or a circuit pattern.

It is a top view of the surface mounter equipped with the illuminating device which concerns on this invention. It is a front view of the upper part of a surface mounter. It is a longitudinal cross-sectional view of the illuminating device which concerns on this invention. It is sectional drawing which shows the state which the illuminating device which concerns on this invention decomposed | disassembled.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 ... Printed wiring board, 5 ... Head unit, 24 ... Positioning mark, 22 ... Illuminating device, 23 ... Image recognition device, 25 ... Camera, 32 ... 1st housing | casing, 33 ... Fixing bolt, 34 ... 2nd 35 ... Light source substrate, 41 ... Half mirror, 42 ... First light source, 44 ... Through hole, 45 ... Second light source, 42a, 45a, 45b ... LED, 47 ... Prism, C ... Optical axis .

Claims (5)

  A first light source that irradiates light to an object to be imaged by a half mirror provided on the optical axis of the camera, and a second light source that irradiates light by a condensing member disposed around the optical axis; In the image recognition apparatus lighting device housed in the housing, a first housing to which the camera is attached, and a second housing detachably attached to the first housing. The half mirror is fixed to the first casing, the condensing member is fixed to the second casing, and the first and second casings are arranged between the first casing and the second casing. An illumination device for an image recognition device, wherein a substrate provided with one light source and a second light source is detachably held.   2. The illumination device for an image recognition device according to claim 1, wherein the first light source and the second light source are constituted by LEDs and mounted on one substrate surface and the other substrate surface of one substrate, and the substrate. Has a through hole that forms an optical path in a portion corresponding to the optical axis of the camera, and is fastened together with the second casing by a bolt that fixes the second casing to the first casing. An illumination device for an image recognition device fixed to a body.   A surface mounter that irradiates a mounting component with light above the component recognition device by the illumination device for an image recognition device according to claim 1 or claim 2.   A surface mounting in which the illumination device for an image recognition device according to the invention described in claim 1 or 2 is installed in a head unit having a suction head, and the object to be imaged on the printed wiring board is irradiated with light by the illumination device. Machine. A component inspection apparatus for irradiating light to an electronic component to be inspected above a component recognition device by the illumination device for an image recognition device according to the invention described in claim 1.

Images