JP2001202515A - Lighting device for image processing system - Google Patents

Abstract

(57) [Summary] [Problem] To provide an illumination device for an image processing system capable of irradiating light so that the contrast between the recognition target object and the background can be reliably increased regardless of the material of the recognition target object. I do. A light source (7A to 7C) that emits light including a wavelength component of light reflected when white light is applied to a recognition target (9A to 9C), and components of the recognition target (9A to 9C) as main components. And reflecting plates 8A to 8C each having a light reflecting surface. A configuration is such that reflected light L2 obtained by reflecting light L1 emitted from light sources 7A to 7C on a light reflecting surface is applied to recognition targets 9A to 9C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illuminating device for irradiating an object to be imaged with light in an image processing system widely used for image recognition of various parts and the like, and more particularly, to an electronic component. The present invention relates to a lighting device suitable for use as alignment of a mounting device.

[0002]

2. Description of the Related Art In recent years, in image processing systems widely used in various fields, in order to perform high-precision image recognition, it is necessary to obtain a high contrast between an object to be imaged by a camera, that is, an object to be recognized and a background. There is a need for a lighting device that can. As shown in FIG. 9, which is a perspective view of a schematic configuration of an illumination device used in a conventional image processing system, light emitted from a light source 1 (generally halogen light is used) is passed through a slide guide 2. It is configured to irradiate the surface of the recognition target 3. By irradiating the recognition target 3 with light in this way, the contrast between the recognition target 3 and the background thereof can be increased, and the recognition target 3 can be easily and accurately recognized as an image. Become. When the contrast between the recognition target 3 and the background does not increase, a plurality of types of color filters 4 are interposed between the light source 1 and the slide guide 2 while being sequentially exchanged, and light passing through the color filters 4 is interposed. Are adjusted in order to increase the contrast between the recognition target 3 and the background.

[0003]

However, in the illumination device having the above configuration, the contrast with the background may not be increased depending on the type of the object 3 to be recognized. For example, when performing image recognition of a circuit pattern (recognition target) formed by applying gold plating on the main body surface (background) of a white ceramic circuit board, the gold-plated circuit pattern and the main body surface of the circuit board are used. Since both light reflectances are high, even if the contrast is adjusted while variously changing the color filter 4, the contrast between the circuit pattern and the substrate main body surface in the captured image does not necessarily increase, resulting in high precision. There was a problem that image recognition could not be performed. Therefore, in an electronic component mounting apparatus that attempts to image-recognize a circuit pattern formed by gold plating on a white ceramic circuit board, the pattern recognition fails and the operation of the apparatus is automatically stopped in some cases.

Accordingly, the present invention has been made in view of the above-mentioned conventional problems, and it is possible to reliably increase the contrast between the recognition target and the background regardless of the material of the recognition target. It is an object of the present invention to provide an illuminating device for an image processing system that can irradiate light to a light source.

[0005]

In order to achieve the above object, a lighting device for an image processing system according to a first aspect of the present invention comprises:
A light source that emits light including a wavelength component of light that is reflected when white light is applied to the recognition target, and a reflection plate having a light reflection surface including the component of the recognition target as a main component Wherein the reflected light obtained by reflecting the light emitted from the light source on the light reflecting surface is applied to the object to be recognized.

In this illuminating device for an image processing system, the emitted light of the light source has a wavelength component of light reflected when white light is applied to the object to be recognized. In the reflected light reflected by the light reflecting surface, only the wavelength component of the light reflected when illuminating the object to be recognized with white light remains, and the spectral distribution in which the light containing other wavelength components is attenuated. Become. In other words, the reflected light from the reflection plate is light in which the wavelength component reflected when white light is applied to the background other than the object to be recognized is attenuated. By taking an image with a camera, an image having a high contrast between the recognition target object and the background can be obtained.

In the above invention, there are provided a plurality of types of reflectors each having a light reflecting surface containing, as a main component, a component of each of the plurality of recognition objects, wherein each of the reflectors is to be irradiated with light. Can be interchangeably provided in response to the difference.

Accordingly, the wavelength component reflected when the white light is applied to the background other than the object to be recognized which is adapted to each reflector is attenuated in the light reflected from each light reflecting surface of each reflector. Light. Therefore, when there are multiple types of recognition targets having components different from each other, a reflection plate suitable for each of the recognition targets is selected and installed, and reflected light from the reflection plates is reflected on the recognition target. By imaging while irradiating, it is possible to obtain an image having a high contrast with the background according to each recognition target.

Further, in the above invention, the light emitted from the light source is reflected by a light reflecting surface of the reflecting plate containing gold as a main component, and is irradiated on a recognition target containing gold as a main component. Can also. This makes it possible to obtain a high-contrast image between a recognition target whose main component is gold and a background whose main component is not gold, and in particular, gold plating often used in electronic component mounting apparatuses. This is suitable for obtaining an image having a high contrast between the circuit pattern and the substrate main body.

According to a second aspect of the present invention, there is provided an illumination device for an image processing system, comprising: a light source that emits light including a wavelength component of light reflected when white light is applied to a circuit pattern on a circuit board; A reflecting plate having a light reflecting surface containing a forming component as a main component, and incorporating the light reflected from the light reflecting surface with the light emitted from the light source by incorporating the light into the substrate recognition unit of the electronic component mounting apparatus. A first illuminator configured to irradiate the circuit board, a light source that emits light including a wavelength component of light reflected when the electronic component is irradiated with white light, and an outer package of the electronic component A reflection plate having a light reflection surface containing a component as a main component, incorporated in a component recognition unit of the electronic component mounting apparatus, the reflected light reflected from the light reflection surface emitted light from the light source, To irradiate electronic components It is characterized in that a second illumination unit has been made.

In this illumination device for an image processing system, when applied to an electronic component mounting device, it is possible to recognize both the positions of the circuit board and the electronic component with high accuracy, and it is not possible to recognize the image due to an image having insufficient contrast. Therefore, it is possible to reliably prevent a trouble that the electronic component mounting apparatus stops due to the above.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a schematic configuration of an illumination device for an image processing system according to a first embodiment of the present invention. In the figure, the emitted light L1 from the light source 7A contains the wavelength component of the light reflected when the recognition target 9A is irradiated with white light. The reflection plate 8A that reflects the emitted light L1 and irradiates the recognition target 9A with a light has a light reflection surface formed mainly containing the components forming the recognition target 9A. The light L2 reflected by the light reflecting surface is configured to irradiate the recognition target 9A.

FIG. 2 is a spectral characteristic diagram showing the relationship between the wavelength and the relative radiation intensity of the light L1 emitted from the light source 7A and the light L2 reflected by the reflector 8A in the illumination device. In the figure, C1 is a characteristic curve showing the spectral distribution of the emitted light L1 of the light source 8A, C2 is a characteristic curve showing the spectral distribution of the reflected light L2 reflected by the reflector 8A, and W1 is the emitted light of the light source 7A. And W2 indicate the wavelength components of light reflected when white light is applied to the recognition target 9A.

As is apparent from FIG. 2, the emitted light L1 of the light source 7A has the wavelength component W1 of FIG. 2, and the emitted light L1 is reflected by the light reflecting surface of the reflector 8A. L
Reference numeral 2 indicates a spectral distribution in which only the wavelength component W2 of the light reflected when the recognition target 9A is irradiated with white light remains, and light containing other wavelength components is attenuated. That is, the reflected light L2 from the reflecting plate 8A is light in which the wavelength component reflected when white light is applied to the background other than the recognition target 9A is attenuated. 9
By imaging while irradiating A, the recognition target object 9A
An image having a high contrast between the image and the background can be obtained.

FIG. 3 is a perspective view showing a schematic configuration of an illumination device for an image processing system according to a second embodiment of the present invention. In the figure, the same or equivalent components as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. In this embodiment, a case is shown in which two types of recognition targets 9A and 9B formed of different components are irradiated with light. The emitted light L1 from the light source 7B includes a wavelength component of light reflected when white light is applied to the recognition targets 9A and 9B.

The object light 9 is reflected by reflecting the emitted light L1.
As described with reference to FIG. 1, the reflector 8A for irradiating A has a light reflecting surface containing a component of the recognition target 9A as a main component. On the other hand, the reflection plate 8B for reflecting the emitted light L1 and irradiating the recognition object 9B with a light has a light reflection surface containing a component of the recognition object 9B as a main component. Therefore, when performing image recognition of one recognition target 9A, the light L1 emitted from the light source 7B is reflected by the one reflecting plate 8A adapted to the recognition target 9A, and is irradiated on the recognition target 9A. When performing image recognition of the other recognition target 9B, the light L1 emitted from the light source 7B is reflected by the other reflector 8B corresponding to the recognition target 9B, and is irradiated on the recognition target 9B. Therefore, the reflection plate 8
Switching between A and 8B is performed according to the recognition objects 9A and 9B. Although FIG. 3 illustrates a case where two reflectors 8A and 8B are provided, the number of reflectors may be three or more.

FIG. 4 is a spectral characteristic diagram showing the relationship between the wavelength of the light L1 emitted from the light source 7B and the light L2 reflected by each of the reflectors 8A and 8B and the relative radiant intensity in the above-mentioned illumination device. In the figure, C2 is the reflected light L that the outgoing light L1 is reflected by one reflector 8A as described in FIG.
2, a characteristic curve indicating the spectral distribution of the reflected light L2 obtained by reflecting the light L1 emitted from the light source 7B on the reflector 8B, and C4 indicating a spectral distribution of the light L1 emitted from the light source 7B. The characteristic curve, W2, is the wavelength component of light reflected when illuminating the recognition target 9A with white light, as described in FIG. 2, and W3 is the reflection component when illuminating the recognition target 9B with white light. The wavelength component of the incoming light, W4 is the light source 7
The wavelength components of the light L1 emitted from B are shown.

As is apparent from FIG. 1, the emitted light L1 of the light source 7B has the wavelength component W4 of FIG. 4, and this emitted light L1 is reflected by the light reflecting surface of the reflector 8A. L
Reference numeral 2 shows a spectral distribution in which only the wavelength component W2 of light reflected when the recognition target 9A is irradiated with white light remains, and light containing other wavelength components is attenuated. Is reflected light L2 reflected by the light reflecting surface of the reflecting plate 8B.
Has a spectral distribution in which only the wavelength component W3 of the light reflected when the recognition object 9B is irradiated with white light remains, and the light containing other wavelength components is attenuated. That is, the reflected light L2 from the reflectors 8A and 8B is light in which the wavelength component reflected when white light is applied to the background other than the applicable recognition target 9A or 9B is attenuated. Therefore, multiple types of recognition target objects 9A and 9B having different components from each other.
Exists, the reflectors 8A and 8B adapted to the respective recognition objects 9A and 9B are selected and installed, and the reflected light L2 from the reflectors 8A and 8B is reflected by the recognition objects 9A and 9B.
By imaging while irradiating 9B, it is possible to obtain an image having a high contrast with the background according to each of the recognition targets 9A and 9B.

FIG. 5 is a perspective view showing a schematic configuration of an illumination device for an image processing system according to a third embodiment of the present invention. In this embodiment, light is irradiated to the recognition target 9C mainly composed of gold, and the emitted light L1 from the light source 7C is reflected when the recognition target 9C is irradiated with white light. Includes wavelength components of incoming light. This emitted light L
Reflector 8C that reflects 1 and irradiates light to recognition object 9C
Has a gold-plated light reflecting surface. The light L2 reflected by the light reflecting surface is configured to irradiate the recognition target 9C.

FIG. 6 is a spectral characteristic diagram showing the relationship between the wavelength and the relative radiant intensity of the light L1 emitted from the light source 7C and the light L2 reflected by the reflector 8C in the illumination device. In the same figure, C5 is a characteristic curve showing the spectral distribution of the light L1 emitted from the light source 7C, and C6 is the light reflected from the reflector 8
A characteristic curve indicating the spectral distribution of the reflected light L2 reflected by C, W
Reference numeral 5 denotes a wavelength component of the light L1 emitted from the light source 7C, and W6 denotes a wavelength component of light reflected when the recognition target 9C is irradiated with white light.

As is apparent from FIG. 2, the emitted light L1 of the light source 7C has the wavelength component W5 shown in FIG. 6, and the emitted light L1 is reflected by the light reflecting surface of the reflector 8C. L
Reference numeral 2 shows a spectral distribution in which only the wavelength component W6 of light reflected when the recognition target 9C is irradiated with white light remains, and light containing other wavelength components is attenuated. That is, the reflected light L2 from the reflecting plate 8C is light in which the wavelength component reflected when white light is applied to the background other than the recognition target 9C is attenuated. 9
By imaging while irradiating C, the recognition target 9C
An image having a high contrast between the image and the background can be obtained. Therefore, by using the illumination device of this embodiment, it is possible to obtain an image with high contrast between the recognition target 9C whose main component is gold and a background whose main component is not gold.

FIG. 7 is a perspective view showing an electronic component mounting apparatus 10 to which an illumination device for an image processing system according to a fourth embodiment of the present invention is applied. First, an outline of the electronic component mounting apparatus 10 will be described. The circuit board 11 on which various electronic components are to be mounted is transported by the substrate transport unit 12 and is positioned and held on the substrate positioning stage 13.

On the other hand, various electronic components 17 to be mounted on the circuit board 11 are housed in a component supply unit 18.
The electronic components 17 in the component supply unit 18 are sequentially taken out of the required components by the component delivery head 19. The electronic component 17 taken out by the component delivery head 19 is used as a pair of component mounting heads 14.
Passed to any of The component mounting head 14 holding the electronic component 17 by suction holds the electronic component 17 at a predetermined mounting position on the circuit board 11 positioned and held on the board positioning stage 13 and mounts the electronic component 17.

The positioning between the electronic component 17 held by the component mounting head 14 and the circuit board 11 and the circuit board 11 is performed on the board positioning stage 13. Prior to this, the circuit held on the board positioning stage 13 is held. Recognition of a position of a predetermined component mounting portion based on image recognition with respect to a circuit pattern of the substrate 11 and recognition of a suction position, a suction posture, and the like based on image recognition of the electronic component 17 held by the component mounting head 14 are performed. . The image recognition of the circuit board 11 is performed by a board recognition unit 20 in which a camera for imaging the circuit board 11 and an illumination device for irradiating the circuit board 11 with light are integrated. Image recognition of the electronic component 17 is performed by a component recognition unit 21 in which a camera (not shown) that captures an image of the electronic component 17 and a lighting device that irradiates the electronic component 17 with light are integrated. The above-described board recognition unit 20 and component recognition unit 21 each incorporate the lighting device according to the fourth embodiment. This illumination device has the same configuration for both the board recognition unit 20 and the component recognition unit 21.

FIG. 8 shows a schematic configuration of a lighting device used for the board recognition unit 20 or the component recognition unit 21 described above.
(A) is a plan view and (b) is a longitudinal sectional view. This lighting device has a structure in which a reflective plate 23 having a circular shape in a plan view is attached to a central portion of a light guide 22. Board recognition unit 20
The reflection plate 23 in the lighting device for use has a light reflection surface 23a containing, as a main component, a component for forming a circuit pattern formed on the circuit board 11 by printed wiring means or the like. On the other hand, the reflection plate 23 in the illumination device for the component recognition unit 21 has a light reflection surface 23a containing the component of the electronic component 17 as a main component. In the lighting device used for any of the devices 20 and 21, the light reflecting surface 23a has an inclination angle at which the light from the light guide surface 22a formed on the lower surface of the light guide 22 and formed on the circumferential surface can be reflected directly below. And has a substantially inverted truncated cone shape. The light emitted from the light source 24 is transmitted through the optical fiber 27 to the light guide 22.
The light is guided through.

The board recognizing section 20 illuminates a recognition target portion on the circuit board 11 held by the board positioning stage 13 from a lighting device, and recognizes a board position based on an image taken by a camera. On the other hand, the component recognition unit 21
The illumination device irradiates the electronic component 17 held by the component mounting head 14 with light from an illumination device, and recognizes the position of the electronic component 17 based on an image captured by a camera. Then, the electronic component 17 is positioned with respect to the circuit board 11 based on the recognition results of the two recognition units 20 and 21, and the component mounting head 14 mounts the electronic component 17 on the circuit board 11.

In the board recognizing section 20, the light from the light guide surface 22a of the light guide 22 is reflected by the light reflecting surface 23a of the reflecting plate 23 formed mainly of the component of the object to be recognized of the circuit board 11, and The object to be recognized on the circuit board 11 is irradiated. The light from the light output surface 22a is reflected by the light reflecting surface 23a, so that only the wavelength component of the light reflected when white light is irradiated onto the circuit board 11 remains, and the other wavelength components are removed. Included light has an attenuated spectral distribution. That is, the light reflected on the light reflecting surface 23a is
Since the wavelength component of light reflected when white light is applied to the substrate background other than the object to be recognized on the circuit board 11 is attenuated, the reflected light is applied to the object to be recognized on the circuit board 11. By doing so, an image having a high contrast between the recognition target on the circuit board 11 and the substrate background can be obtained. Therefore, the recognition rate at the time of recognizing the position of the circuit board 11 is improved by a high contrast image between the recognition target and the substrate background, and the position of the circuit board 11 can be recognized with high reliability.

On the other hand, in the component recognizing section 21, similarly to the board recognizing section 20, the light guide surface 22a of the light guide 22 is provided.
Is reflected by the light reflecting surface 23a formed mainly of the component of the electronic component 17 in the reflecting plate 23,
Electronic component 1 sucked and held by component mounting head 14
7 is irradiated. The light from the light output surface 22a is reflected by the light reflecting surface 23a, so that only the wavelength component of the light reflected when the electronic component 17 is irradiated with white light remains, and includes other wavelength components. The light has an attenuated spectral distribution. That is, the reflected light from the light reflecting surface 23a is light in which the wavelength component of light reflected when white light is applied to the surrounding background other than the electronic component 17 is attenuated. By irradiating the electronic component 17, an image having a high contrast between the electronic component 17 and the surrounding background can be obtained. Therefore, the recognition rate at the time of recognizing the position and the suction attitude of the electronic component 17 is improved by an image having a high contrast between the electronic component 17 and the surrounding background, and the position and the like of the electronic component 17 can be recognized with high reliability.

Therefore, by combining the illumination device according to the fourth embodiment of FIG. 8 and the imaging camera, the board recognition unit 20 and the component recognition unit 2 in the electronic component mounting apparatus 10 are combined.
1 respectively constitute the circuit board 11 and the electronic component 17.
Can be recognized with high precision, and it is possible to reliably prevent the occurrence of troubles such as the electronic component mounting apparatus 10 being stopped due to the inability to recognize the image due to an image with insufficient contrast. . Apart from the above, in the electronic component mounting apparatus 10 which requires a high temperature at the time of bonding the electronic component 17, since the electronic component 17 or the circuit board 11 has resistance to heat, the electronic component 17 or the circuit board 11 By using the reflection plate 23 having the light reflection surface 23a containing the component as a main component, it is possible to configure a lighting device that can withstand use at high temperatures.

[0030]

As described above, according to the illumination device for an image processing system according to the first aspect of the present invention, there is provided a configuration including a reflection plate having a light reflection surface containing a component of a recognition target as a main component. Therefore, despite the fact that the emitted light of the light source has the wavelength component of the light reflected when the recognition target object is irradiated with white light, this emitted light is reflected by the light reflecting surface of the reflector. The reflected light has a spectral distribution in which only the wavelength component of the light reflected when the recognition target object is irradiated with white light remains, and the light containing other wavelength components is attenuated. In other words, the reflected light from the reflection plate is light in which the wavelength component reflected when white light is applied to the background other than the object to be recognized is attenuated. By taking an image with a camera, an image having a high contrast between the recognition target object and the background can be obtained.

According to the illumination device for an image processing system according to the second aspect of the present invention, it is possible to apply the present invention to an electronic component mounting apparatus and to recognize both the positions of the circuit board and the electronic component with high accuracy. It is possible to reliably prevent a trouble that the electronic component mounting apparatus stops due to the inability to recognize the image with the insufficient contrast.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a schematic configuration of a lighting device for an image processing system according to a first embodiment of the present invention.

FIG. 2 is a spectral characteristic diagram showing a relationship between respective wavelengths and relative radiant intensities of projection light from a light source and light reflected from a reflector in the illumination device.

FIG. 3 is a perspective view showing a schematic configuration of a lighting device for an image processing system according to a second embodiment of the present invention.

FIG. 4 is a spectral characteristic diagram showing a relationship between each wavelength and relative radiant intensity of the projection light from the light source and the reflection light from each reflector in the illumination device.

FIG. 5 is a perspective view illustrating a schematic configuration of a lighting device for an image processing system according to a third embodiment of the present invention.

FIG. 6 is a spectral characteristic diagram showing a relationship between respective wavelengths and relative radiant intensities of the projection light from the light source and the reflection light from the reflector in the illumination device.

FIG. 7 is a perspective view showing an electronic component mounting apparatus to which a lighting device for an image processing system according to a fourth embodiment of the present invention is applied.

8A and 8B show a schematic configuration of an illumination device for an image processing system used in a board recognition unit or a component recognition unit in the electronic component mounting apparatus, wherein FIG. 8A is a plan view and FIG.

FIG. 9 is a perspective view showing a schematic configuration of a lighting device of a conventional image processing system.

[Explanation of symbols]

 7A to 7C Light source 8A to 8C Reflector 9A to 9C Recognition target 10 Electronic component mounting device 11 Circuit board 17 Electronic component 20 Board recognition unit 21 Component recognition unit 23 Reflector 23a Light reflecting surface 24 Light source L1 Emitted light L2 Reflected light

Continued on the front page (72) Inventor Yoshihisa Oido 1006 Odakadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. AA03 BA02 BA15 DA06

Claims (4)

[Claims] 1. A light source that emits light including a wavelength component of light reflected when white light is irradiated on an object to be recognized, and a light reflecting surface mainly containing the component of the object to be recognized. An illumination device for an image processing system, comprising: a reflection plate; and irradiating the recognition target with reflected light obtained by reflecting light emitted from the light source on the light reflection surface. 2. A method according to claim 1, further comprising the step of: providing a plurality of types of reflectors having light reflecting surfaces each of which includes, as a main component, a component of each of the plurality of recognition targets. The illumination device for an image processing system according to claim 1, wherein the illumination device is interchangeably provided in accordance with (1). 3. A structure in which light emitted from a light source is reflected by a light reflecting surface of a reflecting plate containing gold as a main component and illuminates a recognition target containing gold as a main component. 3. The illumination device for an image processing system according to claim 1. 4. A light source that emits light including a wavelength component of light reflected when white light is applied to a circuit pattern on a circuit board, and a light reflecting surface mainly including a component of forming the circuit pattern. A reflection plate comprising: a reflection plate having: a reflection plate having a reflection plate, which is incorporated in a substrate recognition unit of an electronic component mounting apparatus, and configured to irradiate the circuit substrate with reflected light obtained by reflecting light emitted from the light source on the light reflection surface. An illumination unit, a light source that emits light including a wavelength component of light reflected when the electronic component is irradiated with white light, and a light reflection surface that includes a component for forming an exterior of the electronic component as a main component. A second reflector configured to incorporate the component in a component recognition unit of the electronic component mounting apparatus, and to irradiate the electronic component with reflected light obtained by reflecting light emitted from the light source on the light reflecting surface. It has a lighting section. Illumination device for image processing system.