JP2000022393A - Illuminator for recognition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a sharp image, by arranging an infrared ray emitting unit for illuminating with infrared rays and a visible ray emitting unit for illuminating with visible rays in a light source for projecting beams onto an object, thereby changing the infrared ray source and the visible ray source to suit for a type or the like of the object. SOLUTION: In the case of mounting an electronic component, a head unit is moved to a predetermined position on a board, a position reference mark of the board is imaged by a board recognition camera 27, and the board position is checked by an image recognition. At the time of imaging, when an object is illuminated by a light by an illuminator 30, a ratio of light quantities of white light LEDs 41, 44 and infrared LEDs 42, 45 is controlled to an optimum value according to the subject. Thus, even if a tone, a surface state or the like is variously changed according to the object, a clear image is obtained, and an accuracy of the recognition is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for manufacturing a printed circuit board, such as a solder printing machine, a surface mounter, a printed circuit board inspection machine, etc., for recognizing a position reference mark on a printed circuit board by imaging. Recognition used for imaging and recognizing electronic components on a printed board for inspection after board mounting on a surface mounter, or imaging and recognizing electronic components adsorbed by a suction head The present invention relates to a lighting device.

[0002]

2. Description of the Related Art A printed circuit board is usually provided with a mark for position reference, and is used for printing by a solder printer, mounting of electronic components by a surface mounter, inspection by a printed board inspector, and the like. After the mark is taken by a camera, the position of the mark is corrected by image recognition, and then each operation is performed. In a surface mounting machine, a printed circuit board inspection machine, and the like, a position of an electronic component after mounting is imaged by a camera, and image recognition is performed to measure a shift of the mounting position.

Further, in a surface mounter, an electronic component picked up by a head is picked up by an electronic camera after the electronic component is picked up by a head, an image recognition is performed to check a shift of the picked-up position, and a mounting position is corrected accordingly. is there.

[0004] As these illumination devices for imaging, incandescent lamps, fluorescent lamps, LED illuminations and the like are generally known.

[0005]

In the case of a conventional incandescent lamp or the like, for example, when used for imaging of a position reference mark on a printed circuit board, if the position reference mark is a copper foil,
The color changes due to the oxidation, the contrast with the printed circuit board is deteriorated, and image recognition may be difficult.
Even in the case of plated marks, image recognition may be difficult due to dirt. In addition, such as a flexible substrate,
If there is a mark under the film, image recognition may be difficult if the color density of the film changes depending on the lot.

[0006] When the electronic component is used for imaging after mounting, image recognition may be difficult depending on the color of the electronic component.

It is known that a light source for irradiating infrared rays is used instead of the white light bulb or the like (for example, JP-A-8-1111600 and JP-A-9-324494). However, in the case of simply irradiating the subject with infrared light simply using an infrared light source, for example, when used for imaging of a solder-plated silver-white position reference mark, the definition is higher than when a white light source is used. Decrease.

The present invention has been made in view of the above circumstances, and provides an illumination device for recognition capable of obtaining a clear image by selectively using an infrared light source and a visible light source according to the type of a subject and the like. It is an object.

[0009]

In order to achieve the above object, the invention according to claim 1 irradiates light to the printed circuit board so that a specific portion of the printed circuit board is imaged and recognized by an image pickup means. In a recognition illumination device, a light source for irradiating a subject with light is provided with an infrared light emitting unit for emitting infrared light and a visible light emitting unit for emitting visible light.

With this arrangement, it is possible to selectively use the infrared light emitting unit and the visible light emitting unit according to the color of a specific portion of the printed circuit board as a subject.

According to a second aspect of the present invention, there is provided a recognition apparatus for irradiating light to the electronic component in order to image and recognize the electronic component sucked by the electronic component suction head of the surface mounter by an imaging means. An illumination device for lighting, comprising: a light source that irradiates a subject with light; an infrared light emitting unit that emits infrared light; and a visible light emitting unit that emits visible light.

With this configuration, it is possible to selectively use the infrared light emitting unit and the visible light emitting unit according to the color of the electronic component as a subject.

In these inventions, if the visible light emitted from the visible light emitting section is set as white light, the white light can be applied to image a solder-plated silver-white position reference mark. Good.

In addition, the amount of infrared light emitted from the infrared light emitting portion and the amount of visible light emitted from the visible light emitting portion can be adjusted independently, and the amount of infrared light and the amount of visible light can be adjusted according to the subject. By providing a control means for controlling the ratio of the amount of light to the amount of light, it is possible to adjust the ratio of infrared light or the ratio of visible light according to the subject.

Control means for enabling the infrared light emitting portion to blink and the visible light emitting portion to be independently switched, and for controlling the infrared light emitting portion or the visible light emitting portion to be selectively turned on according to the subject. Is provided, it is possible to selectively emit either infrared light or visible light according to the subject.

Further, if an infrared light emitting portion and a visible light emitting portion are alternately arranged in an annular area centered on a position corresponding to the axis of the imaging means, the infrared light emitting portion and the visible light emitting portion can be arranged. In any case, light is applied to the subject from the surroundings substantially uniformly.

In addition, light sources including an infrared light emitting section and a visible light emitting section are provided in a plurality of sections in the housing of the lighting device main body, and the angle of incidence with respect to a subject differs depending on the light source in each section. If the light intensity of the light source in the area can be adjusted independently, the ratio of the light intensity from various directions is adjusted according to the subject, so that a clear image can be obtained even when the subject has an uneven shape. It is possible to adjust the lighting condition so that

Further, a light source including a plurality of light emitting units including an infrared light emitting unit and a visible light emitting unit is provided in the lighting device main body housing, and a lens, a prism, and a mirror among the lens are interposed between the light source and a subject. If one or a plurality of irradiation direction adjusting means are provided, the light from each light emitting unit of the light source is effectively irradiated on the subject.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 schematically show the structure of the entire mounting machine when the apparatus of the present invention is applied to the recognition of a printed circuit board in a surface mounting machine. On the base 1, a conveyor 2 for transporting a printed board is arranged, and the printed board 3 is transported on the conveyor 2 and stopped at a predetermined board installation position. An electronic component supply unit 4 is arranged on the side of the conveyor 2. The electronic component supply unit 4 includes a feeder for supplying electronic components, for example, a multi-row tape feeder 4a.

Above the base 1, a head unit 5 for mounting electronic components is provided. The head unit 5 is movable across the electronic component supply unit 4 and the electronic component mounting unit where the printed circuit board 3 is located. In this embodiment, the head unit 5 is in the X-axis direction (the direction of the conveyor 2) and the Y-axis direction (in the horizontal plane). (A direction orthogonal to the X axis).

That is, a fixed rail 7 in the Y-axis direction and a ball screw shaft 8 rotated and driven by a Y-axis servomotor 9 are disposed on the base 1, and a head unit is mounted on the fixed rail 7. A support member 11 is provided, and a nut portion 12 provided on the support member 11 is screwed to the ball screw shaft 8. The support member 11 has X
An axial guide member 13 and a ball screw shaft 14 driven by an X-axis servomotor 15 are provided, and the head unit 5 is movably held by the guide member 13,
A nut portion (not shown) provided on the head unit 5 is screwed to the ball screw shaft 14. And
By the operation of the Y-axis servo motor 9, the support member 11
The head unit 5 moves in the X-axis direction with respect to the support member 11 by the operation of the X-axis servo motor 15 while moving in the axial direction.

The Y-axis servo motor 9 and the X-axis servo motor 15 are provided with encoders 10 and 16, respectively, so that the movement position of the head unit 5 can be detected.

Further, the base unit 1 has a head unit 5
An electronic component recognizing camera 17 for recognizing a suction state of the electronic component sucked by the head unit 5 is provided.
Is moved above the electronic component recognition camera 17 after the electronic component is picked up, so that the electronic component recognition camera 17 captures an image of the picked up electronic component.

As shown in FIG. 3, the head unit 5 is provided with an electronic component suction head 20. In the illustrated example, two heads 20 are provided, and each head 20
The suction nozzle 21 is attached to the tip of the. Each of the heads 20 can move in the Z-axis direction (up-down direction) and rotate around the R-axis (nozzle center axis) with respect to the frame of the head unit 5, and the Z-axis servo motor 22 and the R-axis servo motor 23 Activated by These servo motors 22 and 23 are provided with encoders 24 and 25, respectively, so that the operating position of each head 20 is detected. Further, each head 20 is connected to a negative pressure supply means (not shown) via a valve or the like, and a negative pressure for sucking electronic components is supplied to the head 20 when necessary. The electronic components are attracted to the device.

Further, a board recognition camera 27 (imaging means) is attached to the side of the head unit 5.
The board recognition camera 27 captures an image of a position reference mark (fiducial mark) attached to the surface of the printed circuit board 3 to detect the position of the board at the time of mounting. It is also used for imaging electronic components on the printed circuit board 3 for inspection.

Below the board recognition camera 27, there is provided an illuminating device 30 for irradiating a subject (such as a position reference mark on a printed circuit board) with light during imaging.

FIGS. 4 to 6 show the structure of the illumination device 30. FIG. In these drawings, the lighting device 30 has a light source provided with an infrared light emitting portion and a visible light emitting portion. In the present embodiment, the light sources are provided in a plurality of areas in the lighting device main body housing 31. Further, an irradiation direction adjusting means using one or more of a lens, a prism, and a mirror is disposed between the light source and the subject 49. In this embodiment, as described later, a lens 36, a half mirror 37, and a special shape are provided. Is provided. Then, light from a light source is applied to the subject 49 below the lighting device.

The structure of the lighting device 30 will be specifically described. The main body housing 31 of the lighting device 30 includes an upper wall 31.
a and a four-sided side wall 31b, and has a support wall 31c for supporting a light source and the like therein, and a window hole is provided at a position corresponding to the camera 27 on the upper wall 31a and the support wall 31c. 32 and 33 are formed, and are arranged so that the axis of the camera 27 passes through the center of the window holes 32 and 33.

The light source is divided into three parts located in different areas within the body housing 31. The first part is a light source 35 provided in the space above the support wall 31c. The light source 35 includes a white light LED that emits visible light, for example, white light, and is located on one side orthogonal to the axis of the camera 27. The light from the light source 35 is transmitted through a lens 36 and a half mirror. 37, the light beam becomes parallel to the axis of the camera 27.
The object 49 is illuminated through the through hole 47 of No. 6.

The second part and the third part are inner and outer double annular light sources 40 and 43 disposed on the lower surface side of the support wall 31c.
7 are arranged concentrically about the axis. The inner light source 40, which is the second portion, includes a plurality of white light LEDs 41 that irradiate, for example, white light as visible light emitting units, and a plurality of infrared LEDs 42 as infrared irradiation units. The LEDs 42 are arranged annularly so as to be alternately located. The outer light source 43, which is the third part, also has a white light LED 44 and infrared light L.
A plurality of EDs 45 are arranged, and they are arranged in a ring so that they are alternately located.

The light from these light sources 40 and 43 irradiates a subject 49 via a specially shaped prism 46 located below the light sources 40 and 43. This prism 46
A through hole 47 is provided at the center, and an inner peripheral portion 46a and an outer peripheral portion 46b around the through hole 47 have different cross-sectional shapes. The inner peripheral portion 46a refracts light from the light source 40 with a relatively small refraction. Bend in the camera axis direction at the corner,
The outer peripheral portion 46b is formed to bend the light from the light source 43 in the camera axis direction at a relatively large refraction angle.

Therefore, the light from the light source 35 in the first portion is irradiated at an incident angle of 0 ° to the subject 49, and the light from the light source 40 in the second portion is irradiated at a relatively small incident angle. The light from the light source 43 in the second portion is irradiated at a relatively large incident angle. And subject 4
The reflected light from 9 passes through the through hole 47, the window hole 33, the half mirror 37, and the window hole 32 and enters the camera 27.

A light-shielding plate is provided in the space above the support wall 31c on the side opposite to the light source 35 with the half mirror 37 interposed therebetween. In order to prevent noise from entering the camera,
It is attached to the main body housing in a state inclined with respect to the vertical direction.

FIG. 7 shows a control unit 5 provided in the mounting machine.
0 is shown. The control unit 50 includes a main processing unit 5
1. It includes an axis controller (driver) 52, an image processing unit 53, an illumination device control unit 54, and a memory 55. The main processing unit 51 controls the mounting machine in an integrated manner. The main processing unit 51 controls the mounting according to data read from the memory 55 according to the type of the printed circuit board 3 and recognition results obtained from the image processing unit. A command is given to the axis controller 52 and a command is given to the lighting device control unit 54 for controlling the lighting device 30. The axis controller 52 responds to a command from the main processing unit 51,
The movement of the head unit 5 and the operation of the electronic component suction head 20 in the head unit 5 are controlled by controlling the servo motors shown in FIGS.

When recognizing the board, the image processing section 53 reads the image of the subject 49 picked up by the board recognizing camera 27 and performs predetermined image processing to detect the position of the position reference mark. Although not shown in FIG. 7,
Electronic component recognition camera 1 shown in FIG. 1 at the time of electronic component recognition
By reading the image of the subject 49 taken in 7 and performing predetermined image processing, recognition of the suction electronic component is also performed.

The lighting device control unit 54 controls the lighting device 3
0 light source 35, white light LED 41 of light source 40, infrared light LED 42, white light LED 44 of light source 43, infrared light L
Each of the EDs 45 has an energizing circuit capable of independently adjusting the light amount. Then, the light amount adjustment data stored in the memory in advance for each subject is read out, and based on the data, the lighting device control unit 54 adjusts the ratio of the light amount of each of the light sources 35, 40, and 43 to the optimum value according to the subject. And the light source 4
White light LEDs 41, 44 at 0, 43 and infrared LE
The ratio of the light amounts to D42 and D45 is also controlled according to the subject.

The operation of the apparatus of the present embodiment as described above will be described below.

In the mounting machine equipped with the illumination device 30, the head unit 5 is moved to a predetermined position on the substrate 3 when the printed circuit board 3 is carried in and electronic components are mounted. The position reference mark of No. 3 is imaged, and the substrate position is checked by image recognition. Further, if necessary, the electronic components mounted on the printed circuit board 3 for inspection may be imaged by the board recognition camera 27.

At the time of such image pickup, light is applied to the subject (position reference mark or electronic component) by the illumination device 30.

In such a case, in the light sources 40 and 43, the ratio of the amount of light between the white LEDs 41 and 44 and the infrared LEDs 42 and 45 is controlled to an optimum value according to the subject. For example, when picking up an image of a solder-plated silver-white position reference mark, light is mainly emitted from the white light LEDs 41 and 44, and when the position reference mark is made of copper foil, etc., the infrared LEDs 42 and 45 are mainly used. Irradiates light.

Further, the ratio of the light amount of each of the light sources 35, 40, 43 is also controlled to an optimum value according to the subject. For example, when an object such as an electronic component on the printed circuit board 3 has irregularities, it is difficult for reflected light to uniformly enter the camera 27 by illumination from only one direction. Light is applied to the subject at an appropriate rate.

As described above, the light amount ratio between the white light LEDs 41 and 44 and the infrared LEDs 42 and 45 and the light sources 35 and
By controlling the ratio of the light amounts of the light sources 40 and 43 in accordance with the subject, a clear image can be obtained even if the color tone, surface state, and the like vary depending on the subject, thereby improving the recognition accuracy.

In the above embodiment, the white light LED 4
Although the ratio of the light amount between the infrared LEDs 42 and 45 and the infrared LEDs 42 and 45 is controlled, the blinking of the white LEDs 41 and 44 and the blinking of the infrared LEDs 42 and 45 can be independently switched, and depending on the subject, May be selectively turned on.

In the above embodiment, the board recognition camera 2
The illumination device 30 is provided for the electronic component recognition camera 17, and the illumination device 30 is provided for the electronic component recognition camera 17 so that the electronic component adsorbed by the suction head 20 of the head unit 5 is imaged to perform electronic component recognition. May be used as the illumination of the camera. In this case, the lighting device 30 may be arranged above the camera 17 in a state where the lighting device 30 is turned upside down from the state shown in FIG.

Further, the lighting device of the present invention can be applied to a solder printing machine, a printed circuit board inspection machine, and the like.

[0047]

As described above, the present invention relates to a lighting device used for imaging a position reference mark on a printed circuit board or an electronic component mounted on the printed circuit board. Since the infrared light emitting part for irradiating and the visible light emitting part for irradiating visible light are arranged, the infrared light emitting part and the visible light emitting part can be effectively used properly according to the color of the subject, etc. Thereby, the definition of the position reference mark or the image of the electronic component can be enhanced, and the recognition accuracy can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a surface mounter to which a recognition lighting device according to the present invention is applied.

FIG. 2 is a front view of the surface mounter.

FIG. 3 is a front view showing a head unit mounted on the surface mounter.

FIG. 4 is a sectional front view of a recognition lighting device provided in the head unit.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a bottom view of the illumination device for recognition.

FIG. 7 is a block diagram illustrating a functional configuration of a control unit.

[Explanation of symbols]

 5 Head Unit 20 Head 27 Substrate Recognition Camera 30 Illumination Device 35, 40, 43 Light Source 41, 44 White Light LED 42, 45 Infrared LED 36 Lens 37 Half Mirror 46 Prism

Claims (8)

[Claims] 1. A recognition illuminating device for irradiating a light on a printed circuit board to image and recognize a specific portion of the printed circuit board by an image pickup means. An illumination device for recognition, comprising: an infrared light emitting section for irradiating; and a visible light emitting section for irradiating visible light. 2. A recognition illuminating device for irradiating light to an electronic component to be picked up by an image pickup means for recognizing the electronic component sucked by a component suction head of a surface mounter, wherein the electronic component is illuminated with an object. An illumination device for recognition, comprising: a light source for irradiating light; an infrared light emitting unit for irradiating infrared light; and a visible light emitting unit for irradiating visible light. 3. The recognition illuminating device according to claim 1, wherein the visible light emitted from the visible light emitting section is white light. 4. The amount of infrared light emitted from the infrared light emitting unit and the amount of visible light emitted from the visible light emitting unit can be independently adjusted, and the amount of infrared light and the amount of visible light can be adjusted according to the subject. The illumination device for recognition according to any one of claims 1 to 3, further comprising control means for controlling a ratio of a light amount to a light amount. 5. An infrared light emitting section and a visible light emitting section can be independently switched between a blinking state of the infrared light emitting section and a blinking state of the visible light emitting section, and the infrared light emitting section or the visible light emitting section is controlled to be selectively turned on according to a subject. The recognition lighting device according to any one of claims 1 to 3, further comprising a control unit. 6. An infrared light emitting section and a visible light emitting section are alternately arranged in an annular area centered on a position corresponding to the axis of the image pickup means. A lighting device for recognition according to claim 1. 7. A light source including an infrared light emitting section and a visible light emitting section is provided in a plurality of areas in a lighting device main body housing,
7. The recognition apparatus according to claim 1, wherein an incident angle with respect to a subject is different depending on a light source in each area, and a light amount of the light source in each area is independently adjustable. Lighting equipment. 8. A light source including a plurality of light emitting units including an infrared light emitting unit and a visible light emitting unit is provided in a lighting device main body housing, and a lens, a prism, and a mirror are provided between the light source and a subject. The recognition illumination device according to any one of claims 1 to 7, further comprising an irradiation direction adjusting unit using one or more irradiation directions.