JPH07167621A - Method for inspecting pin appearance - Google Patents

Abstract

PURPOSE:To securely inspect the height dimension and the presence/absence of solder at a high speed and in a highly precision by picking up the shape image of pins whose height and position are made uniform while a brazing jig is inclined at a specified angle and the pin are pushed up. CONSTITUTION:A pin 3, whose head part 3a is, for example, 0.45mm in diameter and 0.2mm in thickness, is brazed by a semi-spherical solder 4. A brazing jig 1 of 2.58mm in thickness for example in which the pins 3 is inserted into several thousands of holes 2 is inclined at about 25 degrees. After the pins 3 are pushed up in a manner that their heights and positions will be made uniform, their shape image is picked up at about 30 degrees diagonally from the above by a two-dimensional camera 8, thereby detecting the height dimension and the presence/absence of the solder 4 through image processing. Thus, the error becomes 2X1 picture element (3mum per picture element), so that the judgement accuracy can be improved and the accurate dimensional measurement and the high-speed judgement of presence/absence of the solder 4 can be also realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for inspecting the appearance of a pin brazed to a head.

[0002]

2. Description of the Related Art Conventionally, in order to inspect the height of a pin brazed to a head and the presence / absence of a braze, the pin is inserted into a hole 2 of a brazing jig 1 as shown in FIG. The pin 3 is pushed up to a certain height, the light of the halogen lamp 5 is applied to the hemispherical solder 4 brazed to the head 3a, and the reflected light position and the reflected light amount are photographed by the line sensor 6, and the image processing is performed. Was going on. By the way, in the above-described pin appearance inspection method, the lamp optical axis and the line sensor optical axis must be accurately aligned in order to determine the image position and the light amount by the barometer. Also, since the halogen lamp 5 becomes dirty,
The light intensity of the lamp changes. However, when the halogen lamp 5 is cleaned, the optical axis shifts. Further, the round upper surface of the wax 4 and the rough (uneven) surface of the wax 4 are affected by the color difference. As a result, the image position becomes different, and if the height of the pin 3 is different, an erroneous determination is made. If the upper surface of the wax 4 is smooth and well reflected, the number of image pixels increases, and it is erroneously determined that there is no wax. Therefore, pin 3
It cannot be judged unless the height difference is less than 0.25mm. Also,
Even if the magnification can be increased for practical use, it cannot be judged unless there is a difference of about 0.15 mm.

[0003]

Therefore, the present invention stops measuring and inspecting the reflected light position and the reflected light amount, takes a shape image of the entire pin, and performs image processing to surely and quickly measure the height. The present invention is intended to provide a method for inspecting the appearance of pins, which enables accurate inspection for the presence or absence of wax.

[0004]

In order to solve the above problems, the pin appearance inspection method of the present invention uses a brazing jig in which the pins brazed to the head are placed in a large number of holes.
Tilt 45 degrees, push up the pin from below, align the height and position,
It is characterized in that a pin-shaped image is photographed from a diagonally upper side with a two-dimensional camera and the height dimension and the presence or absence of wax are inspected by image processing.

[0005]

As described above, in the pin inspection method of the present invention, the pin shape image is photographed by the two-dimensional camera and the height dimension and the presence or absence of the wax are inspected by image processing.
It is not affected by the light amount and the color tone difference of the brazing part, and accurate optical axis alignment is not necessary, and the work is simplified. Therefore, the pin height dimension and the presence or absence of the brazing can be accurately and accurately inspected.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the pin inspection method of the present invention will be described with reference to FIG. A head 3a having a diameter of 0.45 mm and a thickness of 0.2 mm is brazed with a hemispherical brazing wire 4 into a hole 2 in which 90 × 42 = 3780 pins 3 are arranged at 2.5 mm intervals. Thickness 2.
The 58 mm brazing jig 1 is tilted 25 degrees, the pin 3 is pushed up from the bottom, the height and position are aligned, and the shape image of the pin 3 is captured by the two-dimensional camera 8 from 30 degrees diagonally above and the height is processed by image processing. The dimensions and the presence of wax 4 were inspected. In this way, the shape image of the pin 3 is photographed by the two-dimensional camera 8 and the height dimension and the presence or absence of the wax 4 are inspected by image processing.
The error was 2 × 1 pixel (3 μm per image), the determination accuracy was improved, and reliable dimension measurement and the presence / absence of the wax 4 could be performed at high speed.

[0007]

As described above, according to the pin appearance inspection method of the present invention, the pin height dimension and the presence / absence of brazing can be accurately and accurately inspected at a high speed. Can be prevented.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a pin appearance inspection method of the present invention.

FIG. 2 is a diagram showing a conventional pin appearance inspection method.

[Explanation of symbols]

 1 brazing jig 2 holes 3 pins 3a head 4 brazing 7 push-up plate 8 two-dimensional camera

Claims (1)

[Claims] 1. A brazing jig containing a pin brazed to a head is tilted by about 20 to 45 degrees, the pin is pushed up from below, the height and position are aligned, and the pin is diagonally viewed from above by a two-dimensional camera. A method for inspecting the appearance of pins, which is characterized by taking a shape image of the above and inspecting the height dimension and the presence or absence of brazing by image processing.