JP2012038692A - Connector defect inspection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device that solves the problem of false recognition by an area camera used for imaging in which correct movements of the camera and correct images cannot be spliced when an inspection is needed for all the terminals to check if they have any deformation before mounting a press-fit connector to a substrate.SOLUTION: Correct imaging is realized by moving a photographic object at a constant speed using a line camera. At the same time, clearer imaging is achieved by changing a position of lighting.

Description

The present invention relates to an apparatus for press-fitting a connector into a board provided with printed wiring frequently used for electronic components, and more particularly to an apparatus for press-fitting a solderless connector called a “press-fit connector” into a board.

In recent years, cases of employing a solderless press-fit connector “press-fit connector” are increasing in the assembly process of devices using substrates. While conventional connectors are connected by soldering when mounted on a substrate, the press-fit connector method can be mounted by a simple method by press-fitting, and the process can be simplified.
In addition, there is an active movement to reduce harmful substances and environmentally hazardous substances in society, and manufacturing industries are required to make products that do not contain these substances regardless of the field. The press-fit connector is a board manufacturing method adapted to the times.

As shown in FIG. 3, the press-fit connector 20 is energized by inserting a plurality of terminals 21 (terminal tip portions) into through-hole portions formed in the printed circuit board 30 and contacting each other. Therefore, the fitting relationship between the press-fit portion of the terminal 21 and the through-hole of the printed circuit board is designed to be a close fit, and contact energization is performed by a restoring force generated by the fastening allowance.
Therefore, the press-fit connector press-fitting device 1 needs a sufficient pressure for insertion. Usually, a press-fit connector is set in a connector press-fitting device in a state of being temporarily inserted into a board, and is inserted and mounted by a connector press-fitting device. In order to mount the press-fit connector 20 on the printed board, a dedicated pressure jig is required.
In the initial press-fit connector press-fitting device 1, the press-fit connectors 20 temporarily inserted into the printed circuit board 30 were manually positioned and press-fitted one by one.

  Generally, an upper jig 31 and a lower jig 312 are used as the press-fitting jig, and the upper jig 31 has a shape that can be easily press-fitted according to the shape and direction of the press-fit connector 20. The lower jig 312 is made so that the printed circuit board 30 is not distorted and deformed by the pressure when press-fitting the press-fit connector, and when the terminal of the press-fit connector 20 penetrates through the through hole of the printed circuit board 30 In addition, the terminal tip 21 of the press-fit connector 20 that protrudes to the lower side of the printed circuit board 30 is protected from damage.

FIG. 6 illustrates a conventional configuration. This configuration has been proposed by the same applicant as Japanese Patent Application No. 2008-5522. The present invention has the same configuration except for the camera 90 of the imaging unit. Details will be described later.

  In FIG. 6, the camera 90 that captures the terminal tip 21 is an area camera. The camera 90 captures one area, and a plurality of images are connected by the computing unit 3 such as a computer to connect the terminal tip 21 of the entire press fit connector 20. It is the structure which images.

Japanese Patent Application 2008-5522

  As the press-fit connector 20 as shown in FIG. 3 becomes larger and the gap between the terminals becomes narrower, a camera 90 with better resolution than before has been required. Even if the terminal tip portion 21 is deformed, analysis may not be possible.

  In addition, the area camera stitches the images together to create the entire image. Therefore, it is necessary to move the object accurately to capture the image, and if the moving part changes due to thermal effects, multiple images cannot be connected well and are good. May be judged as defective.

In addition, it takes time for a plurality of images to be taken, and the operation of the arithmetic unit that connects the plurality of images is also time-consuming, so that the operation time cannot be reduced.

Furthermore, when taking an image with an area camera, it is recognized that the position of the center of gravity (the center position of the terminal tip 21) is shifted in the direction in which the illumination that illuminates the terminal tip 21 strikes strongly, causing a misalignment. There was a case. Such positional deviation may occur even in the case of the line camera 40.
As described above, it has been desired to reduce the misrecognition of the image processing caused by the condition of the camera and the illumination and to improve the accuracy.

  Therefore, in a failure inspection apparatus for a press-fit connector that is press-fitted and fitted with a pin, an image pickup means for picking up an image of the connector with a line sensor camera, a moving means for moving the connector on the image pickup means, and a pin for the connector It is an object of the present invention to provide a connector defect inspection apparatus comprising an illumination unit for the image pickup unit that irradiates a front end portion with a predetermined angle from a horizontal surface of a front end of a pin of the connector.

The connector defect inspection device is characterized by comprising illumination means for the imaging means that irradiates the tip of the connector pin from both directions at 30 degrees from the horizontal surface of the tip of the connector pin. is there.

According to the conventional invention, a plurality of imaging by the area camera 41 as shown in (2) of FIG. 5 is connected to create an entire imaging.
According to the present invention, as shown in FIG. 5 (1), the focal point of the line camera 40 is imaged so that the object 42 moves in the direction of the arrow (X direction). It is.
This is the same system as the image pickup mechanism of a copy machine, and can produce a more accurate video in a shorter time than the conventional method. Accordingly, erroneous recognition is reduced and accuracy can be improved.

Further, as shown in (2) of FIG. 5, in order to capture an image using the method of the area camera 41, the photographing object 42 must be accurately moved in the XY directions. As shown in FIG. 5 (1), when the image is taken by the line camera 40, the photographing object 42 may be moved in the X direction, and the structure is simple.
Further, in the present invention, as shown in (1) of FIG. 4, it is also possible to take an image with the line camera 40 so as to irradiate the photographing object 42 at a predetermined angle. Further, as shown in (2) of FIG. 4, it is also possible to set up an illumination 40 in parallel with the photographing part of the photographing object 42 and take an image with the line camera 40.

However, as shown in (2) of FIG. 4, the illumination 43 is arranged in parallel with the object to be imaged 42, and the connector 44 is arranged in the X direction by illuminating the tip of the pin 49 of the connector 44 that is the object to be imaged 42. An image is taken with the line camera 40 while moving.
At this time, as in the prior art, the pin 49 close to the illumination 43 and the far pin 49 have bright and dark spots, the reflection of the pin 49 close to the illumination 43 is strong, and the center of gravity (pin) in the bright direction outside the pin 49. In some cases, misrecognition occurred because the center) was shifted. The photograph of (4) in FIG. 5 was taken when irradiated with the configuration as in (2) of FIG.

In the embodiment of the present invention, as shown in FIG. 4 (1), the illumination 43 (licensor illumination 45) is irradiated at an angle of 30 degrees from the surface 431 of the tip of the pin 49 of the connector 44. By sharply reflecting only the tip, it is possible to capture a clear image.
As described above, when the light is irradiated with the illumination 43 at an angle of 30 degrees from the plane 431 of the pin tip and imaged by the line camera 40, only the tip of the pin 49 can be processed as a white dot as shown in the photograph of (3) of FIG. Therefore, recognition errors can be reduced and accuracy can be improved.

  The conventional example of FIG. 6 and the invention according to the invention of FIG. 1 have the same configuration except that the camera 90 and the imaging unit 50 are different.

An embodiment of the invention according to this embodiment will be described with reference to FIGS. The apparatus according to the present invention is controlled by the control unit 2. In addition, each imaging is processed by the calculation unit 3.
The press-fitting part 35 is just moved up and down in the Z direction by a cylinder or a motor disposed in the press-fitting drive part 351.
Further, when the motor 38 is driven and the X-direction screw shaft 381 rotates, the press-fit portion 35 can move in the X direction. Similarly, when the motor 29 is driven and the Y-direction screw shaft 291 is rotated, the press-fit portion 35 can be moved in the Y direction.

First, the pressure part 35 moves to the upper shaft installation base 311 on which the upper jig 31 is placed, and lowers the press-fitting part 35, and selects the upper jig 31 adapted to the shape of the press-fit connector 20 to be selected, The pressure part 35 is chucked by being sandwiched by the clamp 34.

  Next, the press-fit portion 35 is moved in the XY direction while turning the θ-direction to a predetermined position, and the comb at the lower end portion of the upper jig 31 held by the clamp 34 at the terminal rear end portion 22 of the push-fit connector 20 on the installation base 39. The teeth 32 are lowered while being inserted so that the teeth 32 match.

If the terminal rear end portion 22 and the comb teeth 32 come into contact at this time, it is determined that the terminal rear end portion 22 is deformed or bent, and the press-fit connector 20 is determined to be defective.
The press-fit connector 20 that is inserted into the upper jig 31 with the comb teeth 32 and the terminal rear end portion 22 aligned is gripped with the chuck 33 closed, and the press-fit connector 20 is fixed to the upper jig 31.

  The press-fit connector 20 fixed to the upper jig 31 moves to the upper part of the imaging unit 50 according to the present invention. A line camera 40 is disposed in the center of the imaging unit 50, and line illuminations 45 that can irradiate in a line with a constant width are installed on the left and right.

In the case of FIGS. 1 and 2, the line illumination 45 is configured to be irradiated from the surface of the terminal tip 21 of the press-fit connector 20 at an angle of 30 degrees as shown in FIG. 4 (1).
The line illumination 45 irradiates at a position directly above the line camera 40, and the irradiation state at this time is as shown in the “pin irradiation image” of (1) in FIG.

  In the state shown in FIG. 4 (1), the press-fit connector 20 chucked by the press-fitting part 35 in FIG. 1 moves in the X direction on the line camera 40 of the imaging part 50. As a result, the photographing object 42 is imaged by, for example, an operation like a copying machine, and is connected to the whole drawing by the calculation unit 3.

  At this time, the line illumination 45 irradiates the object 42 at an angle of 30 degrees as shown in FIG. 4 (1), so the terminal end of the press-fit connector 20 as shown in the photograph (3) of FIG. The center of 21 is clearly imaged.

As the second method of this embodiment, as shown in FIG. 4 (2), the line illumination 43 is horizontally arranged on the object 42 and the tip of the pin 43 of the connector 44 is irradiated by the illumination 43 while the object is photographed. 42 is moved in the X direction to take an image.
In this way, the line camera 40 may be used. With this method, the mounting state of the illumination 43 can be made compact.
However, as described in the conventional example, the pin 49 close to the illumination 43 and the far pin 49 have uneven illuminance, and the pin close to the illumination 43 shines more strongly on the illumination side of the pin 49, so in image processing than the actual pin Although the outer side is recognized as the center of the pin and is improved over the conventional example, there is a possibility of erroneous recognition.

Even if the light of the illumination 43 is narrowed down by the shielding plate 491 as shown in (2) of FIG. 4, other than the tip of the pin 43 is imaged due to the wraparound of the light.
Then, the image is taken as shown in the photograph of (4) in FIG. 5, but is clearer and less error-prone than the image that is displayed by joining the area camera 41.

As shown in FIG. 5 (1), a state in which the imaging target 42 is imaged by the line camera 40 while moving in the X direction will be described in detail with reference to FIG.
The lower end portion of the upper jig 31 attached to the tip end of the press-fitting portion 35 is in a state of comb teeth 32. The upper jig 31 is held by the clamp 34 and fixed to the press-fit portion 35.

In the state shown in FIG. 2, the press-fit portion 35 is turned 90 degrees in the θ direction, and the press-fit connector 20 and the comb teeth 32 of the upper jig 31 are positioned at a place where they can be fitted.
The press-fitting part 35 images the terminal rear end part 22 of the press-fit connector 20 installed on the installation base 39 by the downward camera 36 and turns in the θ direction on the basis of the result calculated by the calculation part 3 to slightly move in the XY direction. The pressure portion 35 is lowered so that the comb teeth 32 of the upper jig 31 and the terminal rear end portion 22 of the press-fit connector 20 are engaged with each other, and the comb teeth 32 are inserted into the gaps between the terminal rear end portions 22.

The press-fit portion 35 is lowered to a predetermined position. At that time, when a pressure sensor (not shown) built in the pressure unit 35 senses a load exceeding the set value, the operation is stopped and another press-fit connector 20 is selected.
This is because a possibility of contact with the gap between the comb teeth 32 when the terminal rear end portion 22 is inserted is expected.

  In other words, the press-fit connector 20 at this time has any of the terminal rear end portions 22 deformed or misaligned, and it is considered that the pressure sensor has risen in contact with the comb teeth 32. The press-fit connector 20 that has been raised is not picked up from the installation table 39, but left as a defective part and disposed of as a defective product.

  As described above, the positioning and shape of all the pins 49 of the terminal tip 21 of the press-fit connector 20 are inspected, and if there is no problem, the press-fit pressure device 1 is configured to be mounted on the printed circuit board 30. .

  After the comb teeth 32 are inserted to a predetermined position, the chuck 33 is closed, and the press-fit connector 20 is fixed to the upper jig 31 and moved by the movement of the press-fit portion 35 with the comb teeth 32 and the terminal rear end portion 22 engaged. Is done.

Next, the press-fitting part 35 moves to the upper part of the imaging part 50, moves from the terminal tip part 211 of the press-fit connector 20 in FIG. 3 directly above the line camera 40, and is lined in the Y direction of the terminal tip part 211 by the line illumination 45. Is irradiated and imaged.

Thereafter, the motor 38 is driven to rotate the X-direction screw shaft 381 to move the entire press-fit portion 35 in the X direction, and sequentially repeat the terminal tip portion rows 211 to 212..., And finally the terminal tip portion row 250. Take a picture.
The imaging and irradiation image at this time are as shown in (1) of FIG.

When all the terminal tips 21 are imaged as described above and calculated by the calculation unit 3, an image as shown in (3) of FIG. 5 is created.
When the calculation unit 3 determines that the white spots of the imaging as shown in (3) of FIG. 5 are at a predetermined interval and there is no problem, the press-fitting unit 35 connects the press-fit connector 20 to the mounting position 301 of the printed circuit board 30. It moves immediately above, pivots in the θ direction in accordance with the mounting direction, and is inserted so that the terminal tip 21 of the press-fit connector 20 fits into a suitable position of the mounting position 31.

When the white spots of the imaging as shown in (3) of FIG. 5 are not at a predetermined interval and there is a problem, the image is returned to the original position on the installation table 39 as it is, and the chuck 33 is opened and left.
Depending on the number and size of the terminal tip 21, the press-fit connector 20 may require as much as 2000kg of pressure input. May end up. For this reason, accurate positioning and accurate inspection are required.

According to the present invention, as shown in FIG. 5 (1), the focal point of the line camera 40 is imaged so that the object 42 moves in the direction of the arrow (X direction). It is. This is the same system as the image pickup mechanism of a copy machine, and can produce a more accurate video in a shorter time than the conventional method. Accordingly, erroneous recognition is reduced and accuracy can be improved.

Further, as shown in (2) of FIG. 5, in order to capture an image using the method of the area camera 41, the photographing object 42 must be accurately moved in the XY directions. As shown in FIG. 5 (1), when the image is taken by the line camera 40, the photographing object 42 may be moved in the X direction, and the structure is simple.

Further, in the present invention, as shown in (1) of FIG. 4, it is also possible to take an image with the line camera 40 so as to irradiate the subject 42 with a predetermined angle. Further, as shown in (2) of FIG. 4, it is also possible to set up an illumination 40 in parallel with the photographing part of the photographing object 42 and take an image with the line camera 40.

However, as shown in FIG. 4 (2), the illumination 43 is arranged in parallel with the object to be photographed 42, and is arranged so as to irradiate the tip of the pin 43 of the connector 44 that is the object to be photographed 42. When moving with the line camera 40 while moving, the pin 49 close to the illumination 43 and the far pin 49 are brightly dark like the conventional technology, and the reflection of the pin 43 close to the illumination 43 is strongly reflected. Since the center of gravity (pin center) is shifted in the bright direction on the outside, erroneous recognition may occur. In the present invention, such a problem can be eliminated.

In the embodiment of the present invention, as shown in FIG. 4 (1), the illumination 43 (licensor illumination 45) is irradiated at an angle of 30 degrees from the surface 431 of the tip of the pin 49 of the connector 44. By sharply reflecting only the tip, it is possible to capture a clear image.
As described above, when the light is irradiated with the illumination 43 at an angle of 30 degrees from the plane 431 of the pin tip and imaged by the line camera 40, only the tip of the pin 49 can be processed as a white dot as shown in the photograph of (3) of FIG. Therefore, recognition errors can be reduced and accuracy can be improved.

The present invention can be applied not only to press-fit connectors for press-fit connectors, but also to inspection devices for minute parts.

It is a perspective view of the whole press fit connector press-fitting device. It is an enlarged view of the upper part of an imaging part of a press fit connector press-fitting device. It is an expansion perspective view of a press fit connector. It is the schematic diagram which illustrated the arrangement | positioning relationship between a line camera and illumination. It is the imaging schematic diagram of a line camera and an area camera, and an actual captured photograph. It is a perspective view of the whole conventional press fit connector press-fitting device.

1
Press-fit press-fitting device
2
Control unit
Three
Calculation unit
20
Press-fit connector
twenty one
Terminal tip
211
Terminal tip row
212
Terminal tip row
250 Terminal tip row
twenty two
Terminal rear end
29
motor
291
Y direction screw shaft
30
Printed board
301 Press-fit connector mounting position
31 Upper jig
311
Upper jig installation base
312
Lower jig
32 comb teeth
33 Chuck
34 Clamp
35
Press-in part
351 Press-fit drive
36 Downward camera
38
motor
381
X direction screw shaft
39
Installation stand
40
Line camera
41
Area camera
42 Object
43
illumination
431
Pin tip surface
44 connectors
45
Line lighting
49 pin
491 Shield plate
50
Imaging unit
90 cameras

Claims (2)

In a defect inspection device for a press-fit connector that press-fits a pin,
Imaging means for imaging the connector with a line sensor camera;
Moving means for moving the connector on the imaging means;
A connector defect inspection apparatus comprising: an illuminating unit for the imaging unit that irradiates a distal end portion of the connector pin at a predetermined angle from a horizontal surface of the distal end of the connector pin.
2. The fault inspection apparatus for a connector according to claim 1, further comprising: illumination means for the imaging means that irradiates a tip end portion of the connector pin from both directions at 30 degrees from a horizontal plane of the tip end of the connector pin.

Images