JPH05198996A - Electronic component mounting machine - Google Patents

Abstract

PURPOSE:To selectively apply a transmission system and a reflection system when an electronic component is recognized and to change over from one system to the other without moving a light-shielding plate at high speed. CONSTITUTION:A visual recognition part 23 is constituted of the following: a TV camera 18 which visually recognizes an electronic component 20 from the side of its mounting face; a first irradiation means 16, for transmission system use, with which the electronic component 20 is irradiated from the side of its background; a second irradiation means 19, for reflection system use, with which the mounting face of the electronic component 20 is irradiated; and a diffusion plate 17 which has been arranged between the electronic component 20 and the first irradiation means 16. In addition, the diffusion plate 17 is constituted of a black semitransparent body whose surface is formed to be a mirror face. Thereby, when the electronic component 20 is recognized visually by means of a reflection system, a sufficient background state in order to detect an electrode part and a body part at the electronic component 20 can be obtained by using the diffusion plate 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic component mounter in which the position / orientation of an electronic component is detected by visual recognition for positioning the electronic component when mounting the electronic component at a predetermined position on a circuit board. And especially in visual recognition,
The present invention relates to an electronic component mounter capable of selectively applying both the transmissive method and the reflective method.

[0002]

2. Description of the Related Art In recent years, in an electronic component mounter for mounting electronic components on a circuit board, a visual recognition unit detects the position and orientation of the electronic component during transfer, and corrects the position and orientation of the electronic component. A method of accurately mounting on a circuit board is generally adopted.

As described above, in the electronic component mounter which detects the electronic component by the visual recognition unit and mounts it on the circuit board, the electronic component is illuminated from the background side, and the contour image of the electronic component is obtained and processed. An electronic component mounting machine equipped with a visual recognition unit that detects the position / orientation of electronic components by a transmissive method, and illuminates the mounting surface of the electronic components to obtain and process images of the electrodes and body of the electronic components. There is an electronic component mounter provided with a visual recognition unit by a reflection method that detects the position / orientation of an electronic component. Also, an electronic component mounter equipped with a visual recognition unit capable of selectively applying the transmission method and the reflection method according to the characteristics of the electronic component to be recognized has been realized.

The conventional configuration of the visual recognition unit of the above three types will be briefly described with reference to FIGS.

In an electronic component mounter equipped with a transmissive visual recognition unit, as shown in FIG. 4, the component holder 1 of the component transfer unit for transferring electronic components from the component supply unit onto the circuit board is illuminated. A means 2 and a diffuser plate 3 are provided to illuminate the electronic component 4,
The V camera 5 is configured to capture a contour image of the electronic component 4 and perform recognition processing. The diffuser plate 3 located on the surface of the illumination means 2 is required to have a uniform brightness, and generally has a milky white tint.

In an electronic component mounter equipped with a reflection type visual recognition unit, as shown in FIG. 5, a light emitting means 7 is placed on the TV camera 6 side to illuminate the electronic component 8, and the electrode portion of the electronic component 8 and the like. The image of the body portion is picked up by the TV camera 6 and the recognition processing is performed. The component holder 9 that is the background of the electronic component 8 is required to have a color tone that does not hinder the recognition of the electrodes and body of the electronic component 8, and is generally black.

In the electronic component mounting machine to which the transmissive method and the reflective method can be selectively applied, as shown in FIG. 6, the transmissive illumination section 1 including the transmissive illumination means 10a and the diffusion plate 10b is used.
It is provided with both 0 and the reflection type illumination means 11. When recognizing the electronic component 12 by the transmissive method, the reflective illuminating means 11 is turned off or shielded by a light shielding plate, and only the transmissive illuminating means 10a is turned on, and the TV camera 14 illuminates the electronic component 12.
The image of the contour image is captured and the recognition processing is performed. When recognizing the electronic component 12 by the reflection method, the illumination from the transmissive illumination unit 10 is blocked by the light shielding plate 13, the illumination means 11 of the reflection method is turned on, and the TV camera 14 causes the electrode portion and the body portion of the electronic component 12 to be illuminated. Image is captured and recognition processing is performed. Upon recognition by this reflection method, the illumination means 10a is not turned off, but the transmissive illumination unit 1 is used.
0 is shaded because the diffuser plate 10b of the transmissive illumination unit 10 has a milky white tint, and when the diffuser plate 10b is illuminated by the illumination of the reflection type illumination means 11, an image of the electrode portion or the body portion of the electronic component 12 is displayed. This is because it hinders recognition. The light-shielding plate 13 that blocks the illumination from the transillumination unit 10 is an electronic component 12.
Since it is located in the background of, the shape and color of the electrode portion and the body portion of the electronic component 12 must not hinder the image recognition.

[0008]

In the electronic component mounter to which the transmission method and the reflection method as described above can be selectively applied, the mounting tact per electronic component is shortened and the production efficiency of the electronic component mounter is improved. In this case, when switching the recognition method, it is necessary to move the shading plate 13 with respect to the transillumination unit 10 at high speed. Therefore, it is necessary to use a light shading plate that is light and thin, and is light and thin. Since it is necessary to mount 13 so that it does not come into contact with the component holder, it is necessary to have skill in assembling and maintaining the light shielding plate 13.

In view of the above-mentioned conventional problems, the present invention is capable of selectively applying a transmissive method and a reflective method when visually recognizing an electronic component, and can switch the method without moving the light shielding plate at a high speed. The purpose is to provide.

[0010]

In the electronic component mounting machine of the present invention, the visual recognition unit visually recognizes the electronic component from the mounting surface side, and the first illumination means that illuminates the electronic component from the background side. A second illuminating means for illuminating the mounting surface of the electronic component, and a diffusion plate arranged between the electronic component and the first illuminating means, and the diffusion plate is a black surface having a mirror surface. It is characterized by being composed of a semi-transparent body.

[0011]

According to the above structure of the present invention, when the first illumination means of the transmission type is turned off when detecting the electronic component by the reflection type, the electrode part and the body part of the electronic component are detected by the diffusion plate. A sufficient background condition for is obtained. That is, since the diffusing plate is black and the surface is a mirror surface, when the first illuminating means is turned off, the surface of the diffusing plate acts like a mirror, and the irradiation angle of the second illuminating means of the reflection system is set to the diffusing plate surface. If you set the angle so that the reflected light at will not enter the visual recognition means,
Since only the light diffusely reflected by the electrode portion and the body portion of the electronic component enters the visual recognition means, the electrode portion and the body portion are detected in the dark background. On the other hand, when recognizing the electronic component by the transmissive method, the second illumination means is turned off, and the first illumination means is turned off.
When the illuminating means is turned on, the semitransparent diffusion plate is irradiated with the light from the first illuminating means, so that uniform illumination light is emitted from the entire surface of the diffusion plate to the background side of the electronic component, The contour image of the part is incident on the visual recognition means.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An electronic component mounting machine according to an embodiment of the present invention will be described below with reference to FIGS.

First, referring to FIG. 2, the overall structure of the electronic component mounter will be described. Reference numeral 21 is a component supply unit for supplying a predetermined electronic component to the component transfer unit 22, and 22 is a component supply unit for the electronic component. A component transfer section for transferring from the section 21 onto the circuit board 25, a visual recognition section for detecting a position / orientation of electronic parts transferred by the component transfer section 22 by a visual recognition means, and a circuit board for 24. A board holding portion that holds 25 and positions the circuit board 25 so that the electronic component transferred by the component transfer portion 22 is mounted at a predetermined position on the circuit board 25. The component transfer unit 22, the visual recognition unit 23,
It is a control unit that controls the operation of the board holding unit 24 and the entire electronic component mounter.

Next, the structure of the visual recognition unit 23 will be described with reference to FIG. The component holding unit 15 that holds the electronic component 20 of the component transfer unit 22 is provided with the first illuminating unit 16 including a plurality of light emitters as a transmissive illuminating unit, and is held by the component holding unit 15. The electronic component 20 is configured to be illuminated from the background side. In addition, the component holder 15
Is provided with a diffusion plate 17 at a position between the first lighting means 16 and the electronic component 20. Reference numeral 18 denotes a TV camera as a visual recognition means for visually recognizing the electronic component 20 from the mounting surface side. A plurality of second lighting units that illuminate the mounting surface of the electronic component 20 as reflection type lighting means on the side of the TV camera 18.
Illuminating means 19 is provided.

As a concrete example, a high-intensity LED is used as a light emitting body of the first illuminating means 16 and the second illuminating means 19. Further, the diffusion plate 17 is made of a black semi-transparent smoke type acrylic resin plate, and its surface is formed as a mirror surface.

The operation of the electronic component mounter configured as described above will be described.

First, the component supply unit 21 supplies a predetermined electronic component 20 to the component transfer unit 22 according to a command from the control unit 26. The component transfer unit 22 moves the electronic component 20 to the visual recognition unit 23. At this time, the visual recognition unit 23 selects and executes either the transmission method or the reflection method according to a command from the control unit 26.

When the command from the control unit 26 is the transmission method, the first illumination means 16 is turned on and the second illumination means 19 is turned on.
Is turned off, and the contour image 31 of the electronic component 20 as shown in FIG. that time,
Since the semi-transparent diffusion plate 17 is irradiated with the light from the first illumination means 16, the entire surface of the diffusion plate 17 becomes uniform illumination light and illuminates the electronic component 20 from the background side, so that there is no unevenness in illuminance. The contour image 31 enters the TV camera 18. Then, the visual recognition unit 23 processes the contour image 31, detects the position / orientation of the electronic component 20, and sends it to the control unit 26.

When the command from the control unit 26 is the reflection type, the first illuminating means 16 is turned off, and the second illuminating means 19 is turned on.
Is turned on, and the TV camera 18 captures an image 32 of the electrode portion and the body portion of the electronic component 20 as shown in FIG. At that time, since the diffuser plate 17 is black and the surface is a mirror surface, when the first illuminating means 16 is turned off, the surface of the diffuser plate 17 acts as a mirror and diffuses the irradiation angle of the second illuminating means 19. If the angle at which the light reflected on the surface of the plate 17 does not enter the TV camera 18 is set, only the light diffusely reflected by the electrode part and the body part of the electronic component 20 enters the TV camera 18, and thus the diffusion plate 17 is dark. The electrode part and the body part are detected in the background. Then, the visual recognition unit 23 processes the image 32 of the electrode portion and the body portion to detect the position / orientation of the electronic component 20, and sends it to the control unit 26.

The control unit 26 gives a command to the component transfer unit 22 and the substrate holding unit 24, moves the electronic component 20 whose position / orientation is detected by the visual recognition unit 23 onto the circuit board 25, and moves the position of the electronic component 20. The circuit board 25 is positioned so that the attitude follows the mounting data given to the control unit 26, the attitude of the electronic component 20 is corrected, and the electronic component 20 is mounted on the circuit board 25.

As shown in the above embodiment, the transmissive first illuminating means 16 and the electronic component 20 are translucent,
By disposing the diffuser plate 17 which is black and has a mirror surface, a sufficient background state can be obtained only by turning off the first illumination means 16 of the transmission method when executing the recognition method of the reflection method. Therefore, it is not necessary to provide a light blocking plate that moves between the light blocking position and the retracted position.

[0022]

As described above, according to the present invention, in the electronic component mounter capable of selectively applying the visual recognition by the transmission method and the reflection method as described above, between the first illumination means for the transmission method and the electronic component. By disposing the diffuser plate composed of a black translucent body having a mirror surface, the first illuminating means may be turned off and the second illuminating means may be turned on at the time of visual recognition of the reflection method. The switching between the transmissive method and the reflective method is performed only by electrically switching on and off, and it is not necessary to use a light-weight, thin, and solid light shielding plate as in the conventional case. Therefore, in order to improve the production efficiency of the electronic component mounting machine, it is possible to solve the problems of high-speed movement of the light shielding plate, assembly and maintenance when the mounting tact per point of the electronic component is shortened. Also, because mechanical elements such as the light shield can be removed, the component recognition method can be switched at high speed in the visual recognition unit, and in addition to the position / orientation detection of electronic components, more sophisticated appearance inspection of electronic components can also be performed. Demonstrate effects such as possible.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a visual recognition unit of an electronic component mounting machine according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing an overall configuration of an electronic component mounting machine of the embodiment.

FIG. 3 is an explanatory diagram of a recognition image of an electronic component in the example.

FIG. 4 is a configuration diagram of a visual recognition unit in a first conventional electronic component mounter.

FIG. 5 is a configuration diagram of a visual recognition unit in an electronic component mounter of a second conventional example.

FIG. 6 is a configuration diagram of a visual recognition unit in an electronic component mounter of a third conventional example.

[Explanation of symbols]

 16 First Illumination Means 17 Diffusion Plate 18 TV Camera (Visual Recognition Means) 19 Second Illumination Means 20 Electronic Parts 21 Component Supply Section 22 Component Transfer Section 23 Visual Recognition Section 24 Board Holding Section 25 Circuit Board

Claims (1)

[Claims] 1. A component supply unit that supplies a predetermined electronic component, a component transfer unit that transfers the electronic component from the component supply unit onto a circuit board, and a position of the electronic component that is transferred by the component transfer unit. In an electronic component mounting machine including a visual recognition unit that detects a posture and a substrate holding unit that positions a circuit board, the visual recognition unit includes means for visually recognizing the electronic component from its mounting surface side, and an electronic component background. A first illuminating means for illuminating from the side, a second illuminating means for illuminating the mounting surface of the electronic component, and a diffuser plate disposed between the electronic component and the first illuminating means, and An electronic component mounting machine, characterized in that the surface is formed of a black translucent body having a mirror surface.