JP4430184B2 - Illumination method, illumination apparatus, and component mounting apparatus using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an illumination method and an illumination device for irradiating an imaging target with light in an image processing system that is widely used for image recognition of various components and the like, and in particular, alignment of an electronic component mounting device. The present invention relates to a lighting method and a lighting device suitable for use as a lighting device.
[0002]
[Prior art]
In recent years, an image processing system widely used in various fields requires a lighting device capable of obtaining a high contrast between the imaging object of the camera, that is, the recognition object and the background, in order to perform highly accurate image recognition. Has been. As shown in FIG. 9 showing a schematic perspective view of an illuminating 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 object 3. When the recognition target object 3 is irradiated with light in this way, the contrast between the recognition target object 3 and the background thereof can be increased, and the recognition target object 3 can be easily and accurately recognized in terms of image. Become. When the contrast between the recognition object 3 and the background does not increase, light of the color filter 4 is inserted by interchanging a plurality of types of color filters 4 between the light source 1 and the slide guide 2 in order. Are adjusted so that the contrast between the recognition object 3 and the background increases.
[0003]
[Problems to be solved by the invention]
However, in the illumination device having the above-described configuration, the contrast with the background cannot be inevitably increased depending on the type of the recognition object 3. For example, when recognizing an image of a circuit pattern (recognition object) formed by applying gold plating on the body surface (background) of a white ceramic circuit board, the gold plating circuit pattern and the circuit board body surface Therefore, even if the color filter 4 is changed in various ways and the contrast is adjusted, the contrast between the circuit pattern and the substrate body surface in the captured image is not necessarily increased, and high accuracy is achieved. There was a problem that image recognition could not be performed. Therefore, in an electronic component mounting apparatus that attempts to recognize an image of a circuit pattern formed by gold plating on a white ceramic circuit board, pattern recognition may fail and the operation of the apparatus may be automatically stopped.
[0004]
Accordingly, the present invention has been made in view of the above-described conventional problems, and light irradiation is performed so that the contrast between the recognition object and the background can be reliably increased regardless of the material of the recognition object. An object of the present invention is to provide a lighting method, a lighting device, and a component mounting apparatus using the lighting method .
[0005]
[Means for Solving the Problems]
To achieve the above object, a light illumination method comprising the wavelength components of the reflected light recognition object of the present invention, after being reflected by the reflecting surface of the same element components and the surface of the object to be recognized, the reflecting surface After the light including the wavelength component of the reflected light of the recognition object that irradiates the light reflected at the recognition object is reflected by the reflection surface including the component of the recognition object, the light reflected by the reflection surface is reflected. The recognition object is irradiated. The illumination device of the present invention includes a light source that emits light including a wavelength component of reflected light of a recognition object, and a reflection plate having a reflection surface having the same elemental component as the surface of the recognition object. It is preferable that the object to be recognized is irradiated with light emitted from the reflector and reflected by the reflecting surface.
[0006]
According to the present invention, the emitted light of the light source has, for example, a wavelength component of light that is reflected when white light is irradiated on the recognition object, and this emitted light is the recognition object of the reflector . The reflected light reflected by the light reflecting surface of the same elemental component as the surface of the light remains only the wavelength component of the light reflected when, for example, white light is irradiated on the recognition target object, and includes other wavelength components. Becomes the attenuated spectral distribution. In other words, the reflected light from the reflecting plate becomes light in which the wavelength component reflected when the background other than the recognition target object is irradiated with, for example, white light is attenuated. However, an image with a high contrast between the recognition object and the background can be obtained by imaging with the camera.
[0007]
In the above invention, a plurality of types of reflecting plates having light reflecting surfaces each including a component of each of a plurality of recognition objects as main components are provided, and each of the reflecting plates is different from each of the recognition objects to be irradiated with light. It can be set as the structure comprised so that replacement | exchange was possible correspondingly.
[0008]
As a result, the reflected light from the respective light reflecting surfaces of each reflecting plate is attenuated in the wavelength component reflected when, for example, white light is irradiated on the background other than the recognition target object adapted to each reflecting plate. It becomes. Therefore, when there are multiple types of recognition objects having different components from each other, select and install reflectors suitable for each recognition object, and use the reflected light from these reflectors as recognition objects. By imaging while irradiating, it is possible to obtain an image having a high contrast with the background according to each recognition object.
[0009]
Moreover, in the said invention, it can also comprise so that the emitted light from a light source may be reflected in the light reflection surface containing the gold | metal as a main component in a reflecting plate, and may be irradiated to the recognition target object which has gold as a main component. This makes it possible to obtain a high-contrast image between a recognition object whose main component is gold and a background whose main component is not gold, especially 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 body.
[0010]
In addition to the above , the illuminating device further includes a plurality of reflectors each having a reflection surface of a different element component, and a recognition target corresponding to switching of a plurality of recognition objects having different surface element components. And a replacement mechanism for switching to a reflecting plate having a reflecting surface corresponding to the object, and the recognition object is a circuit pattern by gold plating, and the elemental component on the surface of the recognition object is It can be characterized by being gold.
[0011]
In addition, any one of the above lighting devices realizes a component mounting apparatus including the lighting device.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described 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 the first embodiment of the present invention. In the figure, the emitted light L1 from the light source 7A includes a wavelength component of 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 has a light reflection surface that is formed so as to include the component of the recognition target 9A as a main component. The reflected light L2 from the light reflecting surface is configured to irradiate the recognition target 9A.
[0013]
FIG. 2 is a spectral characteristic diagram showing the relationship between the wavelength of the emitted light L1 from the light source 7A and the reflected light L2 from the reflecting plate 8A and the relative radiation intensity in the illumination device. In the figure, C1 is a characteristic curve showing the spectral distribution of the outgoing light L1 of the light source 8A, C2 is a characteristic curve showing the spectral distribution of the reflected light L2 reflected by the reflecting plate 8A, and W1 is the outgoing light of the light source 7A. W2 represents the wavelength component of the light reflected when the recognition object 9A is irradiated with white light.
[0014]
As can be seen from the figure, the emitted light L1 of the light source 7A has the wavelength component W1 of FIG. 2, but the reflected light L2 reflected by the light reflecting surface of the reflecting plate 8A is Only the wavelength component W2 of the light that is reflected when the recognition target 9A is irradiated with white light remains, and the light including the other wavelength components is attenuated. That is, the reflected light L2 from the reflecting plate 8A becomes light in which the wavelength component reflected when the background light other than the recognition target 9A is irradiated with white light is attenuated. By imaging while irradiating 9A, an image with high contrast between the recognition object 9A and the background can be obtained.
[0015]
FIG. 3 is a perspective view showing a schematic configuration of an illuminating device for an image processing system according to the second embodiment of the present invention. In the figure, the same or equivalent parts as in FIG. In this embodiment, a case is shown in which light is irradiated to two types of recognition objects 9A and 9B formed of components different from each other. The emitted light L1 from the light source 7B includes a wavelength component of light that is reflected when the recognition objects 9A and 9B are irradiated with white light.
[0016]
The reflection plate 8A for reflecting the emitted light L1 and irradiating the recognition object 9A has a light reflection surface containing the formation component of the recognition object 9A as a main component as described in FIG. Yes. On the other hand, the reflection plate 8B for reflecting the emitted light L1 and irradiating the recognition target object 9B has a light reflection surface including a component for forming the recognition target object 9B as a main component. Therefore, when image recognition of one recognition object 9A is performed, the emitted light L1 from the light source 7B is reflected by one reflecting plate 8A adapted to the recognition object 9A and irradiated to the recognition object 9A. When performing image recognition of the other recognition object 9B, the emitted light L1 from the light source 7B is reflected by the other reflecting plate 8B corresponding to the recognition object 9B and irradiated to the recognition object 9B. Therefore, switching of the reflectors 8A and 8B is performed according to the recognition objects 9A and 9B. 3 illustrates the case where two reflecting plates 8A and 8B are provided, the number of the reflecting plates may be three or more.
[0017]
FIG. 4 is a spectral characteristic diagram showing the relationship between the wavelength of the emitted light L1 from the light source 7B and the reflected light L2 from the reflecting plates 8A and 8B and the relative radiation intensity in the illumination device. In FIG. 2, C2 is a characteristic curve indicating the spectral distribution of the reflected light L2 reflected by the one reflecting plate 8A, and C3 is the reflecting light L1 from the light source 7B, as described in FIG. A characteristic curve showing the spectral distribution of the reflected light L2 reflected by 8B, C4 is a characteristic curve showing the spectral distribution of the outgoing light L1 from the light source 7B, and W2 is white light on the recognition object 9A as described in FIG. W3 is the wavelength component of the light reflected when the recognition target 9B is irradiated with white light, and W4 is the wavelength component of the light L1 emitted from the light source 7B. Each is shown.
[0018]
As is clear from the figure, the emitted light L1 from the light source 7B has the wavelength component W4 in FIG. 4, but the reflected light L2 reflected by the light reflecting surface of the reflecting plate 8A is Only the wavelength component W2 of the light reflected when the recognition target 9A is irradiated with white light remains, and the light including the other wavelength components is attenuated in the spectral distribution. Similarly, the emitted light L1 is reflected by the reflector. In the reflected light L2 reflected by the light reflecting surface 8B, only the wavelength component W3 of the light reflected when the recognition target 9B is irradiated with white light remains, and light including other wavelength components is attenuated. Spectral distribution. That is, the reflected light L2 from the reflectors 8A and 8B becomes light in which the wavelength component reflected when the background light other than the applicable recognition target objects 9A and 9B is irradiated with white light is attenuated. Therefore, when there are multiple types of recognition objects 9A and 9B having different components, the reflectors 8A and 8B that are suitable for the respective recognition objects 9A and 9B are selected and installed, and the reflectors By capturing images while irradiating the recognition objects 9A and 9B with the reflected light L2 from 8A and 8B, it is possible to obtain an image having a high contrast with the background according to each recognition object 9A and 9B.
[0019]
FIG. 5 is a perspective view showing a schematic configuration of an illumination apparatus for an image processing system according to the third embodiment of the present invention. In this embodiment, light is emitted to the recognition object 9C mainly composed of gold, and the emitted light L1 from the light source 7C is reflected when the recognition object 9C is irradiated with white light. Contains the wavelength component of the incoming light. The reflecting plate 8C that reflects the emitted light L1 and irradiates the recognition object 9C with light has a light reflecting surface that is plated with gold. The reflected light L2 from the light reflecting surface is configured to irradiate the recognition target 9C.
[0020]
FIG. 6 is a spectral characteristic diagram showing the relationship between the wavelength of the emitted light L1 from the light source 7C and the reflected light L2 from the reflecting plate 8C and the relative radiation intensity in the illumination device. In the figure, C5 is a characteristic curve showing the spectral distribution of the outgoing light L1 from the light source 7C, C6 is a characteristic curve showing the spectral distribution of the reflected light L2 reflected from the reflecting plate 8C by the outgoing light L1, and W5 is from the light source 7C. The wavelength component W6 of the emitted light L1 indicates the wavelength component of the light reflected when the recognition target 9C is irradiated with white light.
[0021]
As is apparent from FIG. 6, the emitted light L1 from the light source 7C has the wavelength component W5 in FIG. 6, but the reflected light L2 reflected by the light reflecting surface of the reflecting plate 8C is Only the wavelength component W6 of the light reflected when the recognition target 9C is irradiated with white light remains, and the light including the other wavelength components is attenuated. That is, the reflected light L2 from the reflecting plate 8C becomes light in which the wavelength component reflected when the background light other than the recognition target 9C is irradiated with white light is attenuated. By imaging while irradiating 9C, an image with high contrast between the recognition object 9C 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 object 9C whose main component is gold and the background whose main component is not gold.
[0022]
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 positioned and held on the substrate positioning stage 13.
[0023]
On the other hand, various electronic components 17 to be mounted on the circuit board 11 are accommodated in a component supply unit 18, and the electronic component 17 in the component supply unit 18 is used to deliver a required one of these components. It is sequentially taken out by the head 19. The electronic component 17 taken out by the component delivery head 19 is delivered to one of the pair of component mounting heads 14. The component mounting head 14 that sucks and holds the electronic component 17 transfers and mounts the electronic component 17 to a predetermined mounting position on the circuit board 11 that is positioned and held on the substrate positioning stage 13.
[0024]
The positioning of the electronic component 17 held by the component mounting head 14 and the circuit board 11 is performed in the board positioning stage 13. Prior to that, the circuit board 11 positioned and held on the board positioning stage 13 is positioned. Recognition of the position of a predetermined component mounting unit based on image recognition with respect to the circuit pattern and recognition of the suction position and suction posture based on image recognition of the electronic component 17 held by the component mounting head 14 are performed. Image recognition of the circuit board 11 is performed by a board recognition unit 20 in which a camera that captures the circuit board 11 and an illumination device that irradiates 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 images the electronic component 17 and an illumination device that irradiates the electronic component 17 with light are integrated. The board recognition unit 20 and the component recognition unit 21 each incorporate a lighting device according to the fourth embodiment. This lighting device has the same configuration for both the board recognition unit 20 and the component recognition unit 21.
[0025]
FIG. 8 shows a schematic configuration of the illumination device used in the board recognition unit 20 or the component recognition unit 21, wherein (a) is a plan view and (b) is a longitudinal sectional view. This illuminating device has a structure in which a reflecting plate 23 having a circular shape in plan view is assembled at the center of the light guide 22. The reflection plate 23 in the illumination device for the substrate recognition unit 20 has a light reflection surface 23a containing as a main component a circuit pattern forming component 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 23 a containing the component of the electronic component 17 as a main component. In any of the lighting devices used for the devices 20 and 21, the light reflecting surface 23 a is capable of reflecting the light from the light guide surface 22 a formed on the circumferential surface at the lower part of the light guide 22 directly below. It has a substantially inverted truncated cone shape. Light emitted from the light source 24 is guided to the light guide 22 through the optical fiber 27.
[0026]
The board recognizing unit 20 irradiates light from a lighting device to a recognition target portion on the circuit board 11 held by the board positioning stage 13 and recognizes the board position based on an image captured by the camera. On the other hand, the component recognition unit 21 irradiates the electronic component 17 held by the component mounting head 14 with light from the illumination device and recognizes the position of the electronic component 17 based on the image captured by the camera. Then, the electronic component 17 is positioned with respect to the circuit board 11 based on the recognition results of both the recognition units 20 and 21, and the component mounting head 14 mounts the electronic component 17 on the circuit board 11.
[0027]
In the board recognition unit 20, the light from the light guide surface 22 a of the light guide 22 is reflected by the light reflection surface 23 a formed mainly with the component of the recognition target object of the circuit board 11 in the reflection plate 23. The upper recognition object is irradiated. The light from the light derivation surface 22a is reflected by the light reflection surface 23a, so that only the wavelength component of the light reflected when the circuit board 11 is irradiated with white light remains, and other wavelength components are removed. The contained light has an attenuated spectral distribution. That is, the reflected light from the light reflecting surface 23a becomes light in which the wavelength component of the light reflected when the white background is irradiated to the substrate background other than the recognition target on the circuit board 11 is attenuated. By irradiating the object to be recognized on the circuit board 11 with the reflected light, an image having a high contrast between the object to be recognized on the circuit board 11 and the substrate background can be obtained. Therefore, the recognition rate when recognizing the position of the circuit board 11 is improved by an image having a high contrast between the recognition object and the substrate background, and the position of the circuit board 11 can be recognized with high reliability.
[0028]
On the other hand, in the component recognizing unit 21, similarly to the substrate recognizing unit 20 described above, light from the light guide surface 22 a of the light guide 22 is a light reflecting surface 23 a formed mainly with the component of the electronic component 17 in the reflecting plate 23. And is applied to the electronic component 17 held by suction on the component mounting head 14. The light from the light deriving 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 spectral distribution is attenuated. That is, the reflected light on the light reflecting surface 23a becomes light in which the wavelength component of the light reflected when the surrounding background other than the electronic component 17 is irradiated with white light is attenuated. By irradiating 17, an image with high contrast between the electronic component 17 and the surrounding background can be obtained. Therefore, the recognition rate when recognizing the position and suction posture 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 of the electronic component 17 can be recognized with high reliability.
[0029]
Therefore, if the substrate recognition unit 20 and the component recognition unit 21 in the electronic component mounting apparatus 10 are configured by combining the illumination device according to the fourth embodiment of FIG. 8 and the imaging camera, respectively, the circuit board 11 and the electronic component 17 can be recognized with high accuracy, and it is possible to reliably prevent troubles such as the electronic component mounting apparatus 10 being stopped due to the inability to recognize the image due to insufficient contrast. it can. In addition to the above, in the electronic component mounting apparatus 10 that requires a high temperature when joining the electronic component 17, the electronic component 17 or the circuit board 11 has resistance to heat. By using the reflecting plate 23 having the light reflecting surface 23a containing the above component as a main component, a lighting device that can withstand use at high temperatures can be configured.
[0030]
【The invention's effect】
According to the present invention, since the reflection surface of the same element component as the surface of the recognition object is provided, the reflected light reflected by the reflection surface remains only the wavelength component of the reflection light of the recognition object. The light including a wavelength component other than is attenuated spectral distribution. That is, the reflected light from the reflecting surface becomes light in which the wavelength component reflected from the background other than the recognition target object is attenuated, and by imaging with the camera while irradiating this reflected light on the recognition target object, An image with high contrast between the recognition object and the background can be obtained.
[0031]
Lever to apply the lighting device of the present invention the component mounting apparatus, it is possible to recognize both high accuracy each of positions of the circuitry board and the electronic component, electronic due to unrecognizable by the image of the insufficient contrast It is possible to reliably prevent the trouble that the component mounting apparatus stops.
[Brief description of 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.
FIG. 2 is a spectral characteristic diagram showing the relationship between the wavelength and relative radiation intensity of the projection light from the light source and the reflection light from the reflector in the illumination device.
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.
FIG. 4 is a spectral characteristic diagram showing the relationship between the wavelength of each of the projection light from the light source and the reflected light from each reflector and the relative radiation intensity in the illumination device.
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.
FIG. 6 is a spectral characteristic diagram showing the relationship between the wavelength of each of the projection light from the light source and the reflected light from the reflector and the relative radiation intensity in the illumination device.
FIG. 7 is a perspective view showing an electronic component mounting apparatus to which an illumination device for an image processing system according to a fourth embodiment of the present invention is applied.
FIG. 8 shows a schematic configuration of the illumination device for the image processing system used in the board recognition unit or the component recognition unit in the electronic component mounting apparatus, wherein (a) is a plan view and (b) is a longitudinal sectional view.
FIG. 9 is a perspective view illustrating a schematic configuration of a lighting device of a conventional image processing system.
[Explanation of symbols]
7A to 7C Light sources 8A to 8C Reflectors 9A to 9C Recognition object 10 Electronic component mounting apparatus 11 Circuit board 17 Electronic component 20 Board recognition unit 21 Component recognition unit 23 Reflection plate 23a Light reflection surface 24 Light source L1 Emission light L2 Reflected light

Claims (8)

After light containing a wavelength component of the reflected light of the object to be recognized, and is reflected by the reflecting surface of the same element components and the surface of the object to be recognized,
An illumination method, wherein the object to be recognized is irradiated with light reflected by the reflecting surface. 2. The illumination method according to claim 1, wherein, in response to switching of a plurality of recognition objects having different surface elemental components , switching is made to a reflection surface of an elemental component on the surface of the recognition object that is a recognition object. Recognition object is a circuit pattern by gold plating, illumination method according to claim 1 or 2, wherein the elemental components of the surface of the object to be recognized is gold. After illuminating the component is a recognition object by the illumination method according to any one of claims 1 to 3,
A component recognition method characterized by recognizing the component by imaging a region including the component. A light source that emits light including the wavelength component of the reflected light of the recognition object;
A reflector having a reflecting surface of the same element components and the surface of the object to be recognized,
An illumination system comprising: an optical system that irradiates the recognition object with light emitted from the light source and reflected by the reflecting surface. A plurality of reflecting plates each having a reflecting surface of a different element component ;
Elemental constituents of the surface in response to the switching of a plurality of different recognition object, and the replacement mechanism replace the reflector having a reflecting surface corresponding to the recognition object to be recognized, characterized in that Ru comprising billing Item 6. The lighting device according to Item 5. The illumination device according to claim 5 or 6 , wherein the recognition object is a circuit pattern formed by gold plating , and the elemental component on the surface of the recognition object is gold . Component mounting apparatus characterized by comprising a lighting device according to any of claims 5 7.

Images