JPH05196441A - Illuminating device for image pickup device - Google Patents

Abstract

PURPOSE:To obtain an illuminating device which can apply alternatively a plurality of kinds of lights being different in wavelength by switching of a filter device. CONSTITUTION:At the time when an image of a flat-package-type electronic component is picked up, an ultraviolet-ray transmitting filter 86 is opposed to an optical fiber in a tube 77. Only an ultraviolet ray out of the light emitted by a mercury-vapor lamp 78 is applied onto a light-emitting surface provided on a suction nozzle, converted thereby into a visible light beam and applied to the electronic component. A projection image thus formed is picked up by a camera and a retention attitude error and a twist or a bend of a lead are calculated therefrom. As to a PLCC-type electronic component, a surface image is picked up. At the time of the image pickup, a visible light beam transmitting filter 88 is opposed to the mercury-vapor lamp 78 and a visible light beam is applied to the electronic component. The surface image of the electronic component is formed of a reflected light thereof and picked up by the camera, and the retention attitude error and the twist or the bend of the lead are calculated therefrom.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device for an image pickup device, and more particularly to a lighting device which selectively emits a plurality of types of light having different wavelengths.

[0002]

2. Description of the Related Art A lighting device for an image pickup device is used, for example, in an electronic component mounting device for mounting electronic components on a printed circuit board when a CCD camera, which is an image pickup device, acquires an image of a main body or leads of the electronic component. It By comparing the images of the main body and the leads with the reference images, the holding posture error of the electronic component by the component suction nozzle, the bending of the lead, etc. are obtained, and the holding posture error is corrected and mounted on the printed circuit board with high accuracy. Alternatively, the electronic device is imaged by an image pickup device in order to perform appropriate processing such as stopping mounting of a defective electronic component, and at that time, it is necessary to illuminate the main body of the electronic component and the lead by an illumination device. In this way, when an image pickup target member such as an electronic component is imaged, it may be necessary for the illumination device to emit light of a plurality of wavelengths. Flat package type electronic parts and P
An example is the case of capturing an image of an LCC (Plastic Leaded Chip Carrier) type electronic component. When capturing an image of such an electronic component, it is necessary to determine the holding posture error of the electronic component and the bending of the lead based on the image of the lead. It is desirable to obtain a projected image in order to obtain a clear image. When acquiring a projected image, the method disclosed in JP-A-2-22495 is used.
As described in Japanese Patent Publication No. 1, a ring lamp for irradiating ultraviolet rays is provided on the CCD camera side, and
The camera is equipped with a filter that allows only visible light to pass, and the component suction nozzle is equipped with a fluorescent surface that absorbs ultraviolet light and irradiates it with visible light, converting the ultraviolet light emitted by the ring lamp into visible light. Then, the electronic component is irradiated, the projected image is formed, and the CCD camera captures the image. Only the visible light enters the CCD camera through the filter, and the ultraviolet rays reflected by the electronic parts and the peripheral members do not enter, so that the image of the electronic parts can be obtained clearly. However, a projected image can be obtained in the case of a flat package type electronic component in which leads are extended outward and horizontally from the side surface of the body of the electronic component, but in the case of a PLCC type electronic component, a projected image can be obtained. Can't get The leads of this electronic component are made to extend from the side surface of the main body, have their tips bent inwardly in a J shape, and are positioned inside the outer peripheral edge of the main body. This is because they overlap in the axial direction. Therefore, in the PLCC type electronic component, visible light is emitted from the side where the lead of the electronic component is present, and a surface image formed by the reflected light is captured to obtain an image of the electronic component. In order to obtain images of two kinds of electronic parts, light of two kinds of wavelengths, ultraviolet rays and visible rays, are necessary.

[0003]

However, in the case of irradiating with light of two kinds of wavelengths in this way, in the conventional illuminating device, two kinds of light sources, that is, a light source for irradiating visible light and a light source for irradiating ultraviolet light are used. Since it is provided, there is a problem that the device becomes large and the cost becomes high. To solve this problem, images of electronic circuit components such as a plurality of types of electronic components, printed circuit boards, cream-like solder and adhesive applied on the printed circuit boards, and printed wiring printed on the printed circuit boards are acquired by an imaging device. The same happens in the case. For example, when images of a plurality of types of electronic components that are mounted on a printed circuit board and have different colors are acquired for each type, light that corresponds to the color of each electronic component (for example, is reflected well depending on the electronic component of a specific color) It is possible to obtain only the image of a specific type of electronic component by irradiating it with light that is hardly reflected by the electronic components of other colors. In that case, light of a plurality of types of wavelengths is required, and a plurality of light sources are required, which makes the device large and expensive. According to a first aspect of the present invention, there is provided a lighting device for an image pickup device for obtaining a projected image and a surface image of an image pickup target member, wherein one light source can selectively radiate two types of light having different wavelengths. The object of the present invention is to provide an illuminating device that can be used. According to a second aspect of the invention, there is provided an illumination device for an image pickup device for picking up an image of an electronic circuit component member, wherein a single light source can selectively irradiate a plurality of types of light having different wavelengths. It was made as a task to provide.

[0004]

In order to solve the above-mentioned problems, an illumination device for an image pickup device according to a first aspect of the present invention includes:
(A) a wavelength conversion light emitting body that absorbs the emitted light and emits light having a wavelength different from the wavelength of the light, and (b) is provided on the opposite side of the image conversion target member from the wavelength conversion light emitting body, A light source that emits light in a wide range of wavelengths, including light that is absorbed by the wavelength conversion light emitter and converted into light of different wavelengths, and light that can be reflected by the imaging target member; and (c) wavelength conversion light emitter Is configured to include a filter device that switches between a state that allows transmission of light having a wavelength absorbed by and a state that allows transmission of light having a wavelength reflected by the imaging target member. In order to solve the above-mentioned problems, an illumination device for an imaging device according to a second aspect of the present invention includes (a) a light source that emits light having a wide range of wavelengths, and (b) light emitted from the light source. , A filter device that switches to a state that allows the transmission of a plurality of types of light having different wavelengths, respectively.

[0005]

In the illuminating device according to the first aspect of the present invention, the projected image of the member to be imaged is formed by the light emitted by the wavelength conversion light emitter, and the surface image is formed by the light reflected by the member to be imaged. Therefore, when the projection image of the imaging target member is captured, the filter device is switched to a state that allows the transmission of light that is absorbed by the wavelength conversion light emitter and converted into light of a different wavelength, and captures the surface image. In that case, the state is switched to a state that allows the transmission of light having a wavelength that can be reflected by the member to be imaged. Even if the light emitted to the wavelength conversion light-emitting body strikes the member to be imaged and is reflected, the light having a different wavelength from the light forming the projected image can extract only the projected image. Further, even if the light radiated to the image pickup target member hits the wavelength conversion light-emitting body and is reflected, it is not the same as the reflected light from the image pickup target member, and only the surface image of the image pickup target member can be obtained. In the illumination device according to the second aspect of the present invention, the filter device is switched so that light capable of acquiring an image of the electronic circuit component member is emitted according to the imaged electronic circuit component member.

[0006]

As described above, according to the first aspect of the present invention, it is possible to selectively irradiate light of two kinds of wavelengths with one light source by switching the filter device, and the projected image of the member to be imaged. Also, an illumination device for an image pickup device that picks up a surface image can be configured easily and inexpensively. According to the invention of claim 2, by switching the filter device, it is possible to selectively irradiate light of a plurality of kinds of wavelengths with one light source, and illumination for an image pickup device for picking up an image of an electronic circuit component member. The device can be constructed simply and inexpensively.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the inventions of claims 1 and 2 are applied to an illuminating device for an image pickup device for picking up images of a flat package type electronic component and a PLCC type electronic component will be described below in detail with reference to the drawings. .. FIG. 6 shows a flat package type electronic component 1 (electronic component 1 as an imaging target member).
For short). Main body 2 of this electronic component 1
Has a thin rectangular parallelepiped shape, and a plurality of leads 3 are outwardly extended from the two side surfaces thereof.
These leads 3 are bent in parallel with the main body 2 after being extended in parallel with the main body 2. Further, FIG. 5 shows another PLCC type electronic component 10 (hereinafter, abbreviated as electronic component 10) which is an imaging target member. A main body 12 of the electronic component 10 has a thin rectangular parallelepiped shape, and a plurality of leads 1 are provided from each of four sides thereof.
4 is extended. The tips of the leads 14 are bent inwardly in a J shape, and the tips are located inside the outer peripheral edge of the main body 12.

The electronic components 1 and 10 are mounted on a printed circuit board (not shown) by the component mounting head 20 shown in FIG. The index table 24 rotatably supported by the base plate 22 supports a plurality of component mounting heads 20 so that the component mounting heads 20 can move up and down at equal angular intervals. Since the index table 24 is fitted in a cam groove (not shown) and the index table 24 is rotated intermittently, the component suction head 20 is sequentially moved to a component supply position, a component posture detection position, a component posture correction position, a component mounting position, etc. To be made.

The component mounting head 20 has three suction nozzles 30 (only one is shown in the figure) held by a nozzle holder 28, and the nozzle holder 28 is a rotary drive device (not shown). The three suction nozzles 30 are selectively positioned at the suction positions where the electronic components 1 and 10 are sucked by being rotated by. Suction nozzle 30
The main body 34 is fitted into the nozzle holder 28 so as to be able to move up and down, and is urged upward by a spring 36. An adsorption pipe 38 is fitted in the main body 34 so as to be relatively movable in the axial direction, and is biased by a spring (not shown) in a direction projecting downward from the main body 34. The suction tube 38 is vacuumed to make the electronic components 1,
The light emitting plate 40 is attached to the protruding portion of the main body 34. Fluorescent paint is applied to the lower surface of the light emitting plate 40, which faces the electronic components 1 and 10 adsorbed by the adsorption tube 38, and serves as a light emitting surface 42 that absorbs ultraviolet rays and emits visible light. The light emitting plate 40 constitutes a wavelength conversion light emitting body.

An image pickup device 48 is provided at the above-mentioned component posture detection position.
(See FIG. 3) and a lighting device 50 (see FIG. 1) are provided. The respective devices 48 and 50 will be described below.
The imaging device 48 includes a large-field camera 52 having a wide field of view and a small-field camera 54 having a narrow field of view. These cameras 52 and 54 are CCD cameras, which are provided with filters that allow the transmission of visible light and block the transmission of ultraviolet light, and are arranged at positions on the extension line of the index table 24 of the base plate 22 in the radial direction. It is installed downward. The cameras 52 and 54 have different imaging magnifications, the large-field camera 52 has a small magnification but a wide field of view, and the small-field camera 54 has a large magnification but a narrow field of view.
The electronic components 1 and 10 are used properly according to their sizes.

The imaging device 48 also includes a prism box 6
It has 0. Casing 6 of prism box 60
A half mirror 64 is provided in the position below the suction nozzle 30 positioned at the suction position in 2 to allow transmission of a part of light emitted from the electronic components 1 and 10 side and the opposite side. And, it is designed to reflect some light. Further, a half mirror 66 is provided so as to face the large-field camera 52, and a part of the light reflected by the half mirror 64 is reflected to enter the large-field camera 52. Further, a total reflection mirror 68 is provided so as to face the small-field camera 54, and the light transmitted through the half mirror 66 is reflected to enter the small-field camera 54.

The lighting device 50 includes a light emitter 70. The luminous body 70 is provided concentrically with the suction nozzle 30 positioned at the suction position below the prism box 60. As shown in FIG. 4, the casing 72 of the light-emitting body 70 has a circular shape, and one end of many optical fibers 74 is fixed upward in the casing 72, and a diffusion plate 76 is provided in the opening. It is adapted to diffuse the light emitted by 74. The other ends of the optical fibers 74 are integrated into a tube 77 and face a mercury lamp 78 as a light source as shown in FIG.

The light emitted by the mercury lamp 78 is condensed by the condenser lens 80 and is also filtered by the filter device 82.
Only the light allowed to pass through enters the other end of the optical fiber 74. The filter device 82 has a slider 84 provided between the condenser lens 80 and the other end of the optical fiber 74 so as to be movable in a direction orthogonal to the optical axis of the condenser lens 80. The slider 84 includes an ultraviolet ray transmission filter 86 that allows transmission of ultraviolet rays but blocks transmission of visible rays and a visible ray transmission filter 88 that allows transmission of visible rays but blocks transmission of ultraviolet rays. They are provided side by side in the moving direction. In addition, the slider 84 is shown in FIG.
As shown in FIG. 5, a notch 90 extending at right angles to the moving direction of the pin 9 is formed, and a pin 9 is provided at one end of a link 94 that is rotated by a rotary solenoid 92.
6 is inserted. Therefore, when the link 94 is rotated by the rotary solenoid 92, the slider 84 is moved, and the ultraviolet light transmission filter 86 and the visible light transmission filter 88 are selectively positioned at the working position facing the mercury lamp 78. ..

In the electronic component mounting apparatus configured as described above, after the suction nozzle 30 positioned at the suction position sucks the electronic component 1 or 10 at the component supply position, the electronic component 1 or 10 is detected at the component posture detection position. The holding posture of is detected. The holding posture is detected when the suction nozzle 30 is stopped at the component posture detection position. When it is the electronic component 1 that is detected, the ultraviolet transmission filter 86 is positioned at the operating position, and only the ultraviolet rays of the light emitted by the mercury lamp 78 enter the optical fiber 74,
The electronic component 1 is irradiated from the light emitter 70. After passing through the half mirror 64, this light is absorbed by the light emitting surface 42 and converted into visible light, which is irradiated to the electronic component 1 to form a projected image thereof.

The light forming this projection image is the half mirror 6.
Part of the light is reflected by the half mirror 66 to enter the large-field camera 52, and the remaining part is reflected by the total reflection mirror 68 to enter the small-field camera 54. An image of the main body 2 of the electronic component 1 is acquired by each of the cameras 52 and 54.
Whether or not the holding posture error is detected from the images acquired by 2 and 54 is preset according to the size of the electronic component 1. Then, the acquired image of the electronic component 1 is compared with the reference image to calculate the horizontal position errors ΔX and ΔY and the rotational position error (rotational angle error about the vertical axis) Δθ. After the calculation, the suction nozzle 3 at the component posture correction position
0 is rotated around its own axis and the rotational position error Δ
When θ is corrected, the horizontal position error Δ
X and ΔY are corrected, and the electronic component 1 is accurately mounted on the printed circuit board in a proper posture. If the lead 3 is bent or twisted and cannot be mounted on the printed circuit board, the electronic component 1 is discarded and appropriate processing is performed to avoid the generation of a defective printed circuit board.

When it is the electronic component 10 that is detected, the visible light transmitting filter 88 is positioned at the working position. As a result, of the light emitted from the mercury lamp 78, only visible light enters the optical fiber 74, and
The surface of the electronic component 10 on the side where the tip of the lead 14 is located is irradiated from 0 to pass through the half mirror 64, and is reflected to form a surface image. The light forming this surface image is reflected by the half mirrors 64 and 66 and the total reflection mirror 68, and is picked up by the large-field camera 52 and the small-field camera 54. The image picked up by either one of the cameras and the reference image. Are compared to calculate horizontal position errors ΔX and ΔY and rotational position error Δθ. After the calculation, the suction nozzle 30 is rotated around its own axis at the component posture correction position to correct the rotational position error Δθ, and the horizontal position is corrected by correcting the respective movement distances of the printed circuit board in the X-axis direction and the Y-axis direction. The errors ΔX and ΔY are corrected, and the electronic component 10 is accurately mounted on the printed circuit board in a proper posture. If the lead 14 is bent or twisted and cannot be mounted on the printed circuit board, the electronic component 10 is discarded, and appropriate processing is performed to avoid the generation of a defective printed circuit board.

As described above, according to the lighting apparatus of this embodiment,
By switching the filters 86 and 88 of the filter device 82, it is possible to irradiate both ultraviolet rays and visible rays with the single mercury lamp 78, and the device can be configured simply and at low cost. In addition, the electronic components 1 and 10 include a light emitter 7
Light is emitted by 0, and uniform light can be emitted over a wide area. Light emitting surface 4
When directly irradiating 2 or electronic components 1 and 10, the irradiation area and the irradiation shape are limited by the shape of the light source, whereas if the light is irradiated through the light emitting body 70,
The irradiation area and shape can be freely set, and sufficient light can be irradiated. The light-emitting body 70 capable of emitting uniform light over a wide area as described above can be provided with only one light source, and the structure below the suction nozzle 30 positioned at the component attitude detection position is easy. Because. When the ultraviolet light and the visible light are emitted from different light sources, it is necessary to provide two light sources or light emitters below the suction nozzle 30 at the component attitude detection position, and they prevent the mutual light emission. In contrast to the present embodiment, when the number of light sources is only one as in the present embodiment, the degree of freedom under the suction nozzle 30 is increased, which is sufficient. It is possible to provide a light emitter 70 that emits a certain amount of light. Furthermore, the structure near the light source is simplified, and the light source can be easily replaced. Furthermore, when irradiating ultraviolet rays and visible light from different light sources, it takes time to turn on the ultraviolet lamp,
It is useless because it is necessary to keep the ultraviolet lamp lit at all times, and since the fluorescent surface always emits visible light, it may adversely affect image processing, but one light source emits it. There is no waste when irradiating ultraviolet rays and visible light by selecting the wavelength of light, and there is no adverse effect on image processing due to the irradiation of extra light. In addition, in the present embodiment, since both the projected image and the surface image are formed by visible light, the camera for capturing these images should be one type that is sensitive to visible light. Well, the imaging device can be easily configured.

In this embodiment, it is the electronic components 1 and 10 that are imaged, and the electronic circuit components, which is also the embodiment of claim 2.

Further, in the above embodiment, the wavelength conversion luminescent material absorbs ultraviolet rays and emits visible rays, so that both the projected image and the surface image of the member to be imaged are formed by visible rays. Alternatively, the projection image and the surface image may be formed by light of other wavelengths, or may be formed by light of different wavelengths.

Further, in the above-mentioned embodiment, the case where the image of the flat package type electronic component 1 or the PLCC type electronic component 10 is picked up has been described as an example. However, the leads are arranged perpendicularly to the surface of the main body and in a grid pattern. The invention according to claim 1, wherein the illumination device is used for capturing other types of electronic components such as pin grid array (PGA) type electronic components, or for capturing projected images and surface images of members other than the electronic components. And a lighting device used for imaging electronic circuit components other than the electronic components 1 and 10.
The invention of can be applied.

Further, in the above embodiment, two cameras are provided, which can be selectively used according to the dimensions of the electronic components 1 and 10, but this is not essential, and one large-field camera is provided. It may be alone.

In addition, the present invention can be implemented in various modified and improved modes based on the knowledge of those skilled in the art without departing from the scope of the claims.

[Brief description of drawings]

FIG. 1 is a front view (partial cross section) showing an illuminating device that is an embodiment of the invention of claims 1 and 2. FIG.

FIG. 2 is a side view showing the lighting device.

FIG. 3 is a front view (partially sectional view) showing a part of an electronic component mounting device including the lighting device.

FIG. 4 is a plan view (partially cutaway) showing a light emitting body that constitutes the lighting device.

FIG. 5 is a perspective view showing a PLCC type electronic component mounted on a printed circuit board by the electronic component mounting apparatus.

FIG. 6 is a front view showing a flat package type electronic component mounted on a printed circuit board by the electronic component mounting apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flat package type electronic component 10 PLCC type electronic component 40 Light emitting plate 48 Imaging device 50 Illumination device 78 Mercury lamp 82 Filter device 86 Ultraviolet transmission filter 88 Visible light transmission filter

Claims (2)

[Claims] 1. An illumination device for an imaging device, which acquires a projected image and a surface image of an imaging target member, wherein the wavelength conversion light emission absorbs irradiated light and emits light having a wavelength different from the wavelength of the light. A body and light that is provided on the side opposite to the wavelength conversion light emitter with respect to the imaging target member, is absorbed by the wavelength conversion light emitter, and is converted into light of a different wavelength, and the imaging target member may be reflected. A light source that emits light in a wide range of wavelengths including light, a state that allows transmission of light having a wavelength absorbed by the wavelength conversion illuminant, and a transmission of light having a wavelength reflected by the imaging target member. A lighting device for an image pickup device, comprising: a filter device that switches to a state. 2. An illumination device for an image pickup device for picking up an image of an electronic circuit component member, wherein a light source that emits light of a wide range of wavelengths and a plurality of light beams emitted from the light source that have different wavelengths. A lighting device for an imaging device, comprising: a filter device that switches to a state in which each type of light transmission is allowed.