JPH11203475A - Method for inspecting cream soldered print by beam slit illumination - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cream soldered print inspection method using beam slit illumination, capable of clearly photographing luminescent lines on a printed board and also luminescent lines on a cream soldered print part. SOLUTION: A beam slit illuminator 4 is arranged so that luminescent lines 3 are applied to the surface of a cream soldered print part 2 and of a printed board 1 at a prescribed angle. Under such a state, photographing based on light quantity suitable for the photography of luminescent lines 3 on the printed board 1 and photographing based on light quantity suitable for photography on the cream soldered print part 2 are executed to inspect the print part 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a beam slit for inspecting a cream solder printed portion by applying a bright line from a beam slit illuminator to a surface of the cream solder printed portion printed on a printed circuit board and the surface of the printed board. The present invention relates to a method for inspecting cream solder printing by illumination.

[0002]

2. Description of the Related Art As shown in FIGS. 2 to 4, when inspecting the width and height of a rectangular cream solder printing portion 2 printed on a soldering land portion on a printed circuit board 1, a required angle ( A laser light source is used on the surfaces of the cream solder printing unit 2 and the printed circuit board 1 with the beam slit illuminator 4 installed so that the bright line 3 hits the surfaces of the cream solder printing unit 2 and the printed circuit board 1 at 45 degrees. Camera 5 such as a CCD camera by applying a bright line 3 from the beam slit illuminator 4
It is done by shooting at.

In this case, the position of the bright line 3 on the surface of the cream solder printing unit 2 is shifted from the position of the bright line 3 on the surface of the printed circuit board 1 as shown in FIG. .

For this reason, by measuring the length of the bright line 3 on the surface of the cream solder printing unit 2, the width of the cream solder printing unit 2 is determined, and the position of the bright line 3 on the surface of the printed circuit board 1 is determined. The height of the cream solder printed portion 2 is determined from the distance to the position of the bright line 3 on the surface of the solder paste. Also, (Area of soldering land before cream solder printing)-
(Area of soldering land after cream solder printing where no cream solder printing portion is provided) = (Area of cream solder printing portion) The area of cream solder printing portion 2 can be obtained from the following calculation.

Further, the volume of the cream solder printing section 2 can be obtained from the following calculation: (area of the cream solder printing section) × (height of the cream solder printing section) = (volume of the cream solder printing section).

For this reason, it is possible to determine whether or not the cream solder printing unit 2 is appropriate.

[0007]

However, the printed circuit board 1 and the cream solder printing section 2 have different degrees of light reflection and scattering, and therefore, are photographed with a light amount suitable for photographing the bright line 3 on the printed circuit board 1. Is performed, the bright line 3 on the cream solder printing unit 2 becomes unclear, and when photographing is performed with an amount of light suitable for photographing the bright line 3 on the cream solder printing unit 1, the bright line 3 on the cream solder printing unit 2 Becomes blurred,
There was a problem that the photographing of the bright line 3 could not be performed properly.

It is an object of the present invention to provide a cream solder printing inspection method by beam slit illumination capable of clearly photographing a bright line on a printed board and a bright line on a cream solder printing portion.

[0009]

According to the present invention, a cream solder printed portion printed on a printed circuit board and a surface of the printed circuit board are inspected by applying a bright line from a beam slit illuminator to the surface of the cream solder printed portion. An object of the present invention is to improve a cream solder printing inspection method using beam slit illumination.

In the cream solder printing inspection method using the beam slit illumination according to the present invention, the beam slit illuminator is installed so that the bright line hits the cream solder printing portion and the surface of the printed board at a required angle. In such a state,
Inspection of the cream solder printing portion is performed by performing shooting with the light amount suitable for shooting the bright line on the printed circuit board and shooting with the light amount suitable for shooting the bright line on the cream solder printing portion.

With this configuration, the bright line on the printed circuit board and the bright line on the cream solder printed portion can be clearly photographed, and the bright line can be properly photographed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a configuration of a cream solder print inspection apparatus using beam slit illumination for implementing a cream solder print inspection method using beam slit illumination. Parts corresponding to those in FIG. 2 described above are denoted by the same reference numerals.

In the cream solder printing inspection apparatus using the beam slit illumination, in addition to the beam slit illumination body 4 and the camera 5, the amount of light of the beam slit illumination body 4 can be set and an input from the camera 5 is performed. Microcomputer 6 for performing inspection processing of solder printing unit 2
And a monitor 7 for displaying a captured image from the camera 5.

Next, a description will be given of a cream solder print inspection method using beam slit illumination of this embodiment using such a cream solder print inspection apparatus using beam slit illumination.

In this embodiment, first, the beam slit illuminator 4 is installed so that the bright line 3 hits the cream solder printing section 2 and the surface of the printed circuit board 1 at a required angle (45 degrees). A camera 5 such as a CCD camera is installed right above.

Next, according to a command from the microcomputer 6,
The amount of light of the bright line 3 emitted from the beam slit illuminator 4 is sequentially changed to obtain a light amount suitable for photographing the bright line 3 on the printed circuit board 1, and the value is stored in the microcomputer 6.

Further, according to a command from the microcomputer 6,
The light amount of the bright line 3 emitted from the beam slit illuminator 4 is sequentially changed to obtain a light amount suitable for photographing the bright line 3 on the cream solder printing unit 2, and the value is stored in the microcomputer 6.

In this state, the bright line 3 having a light amount suitable for photographing the bright line 3 on the printed circuit board 1 is applied from the beam slit illuminator 4 to the surface of the printed circuit board 1 and the cream solder printing section 2, and the bright line 3 hits. The printed circuit board 1 and the cream solder printing unit 2 are photographed by the camera 5.

Next, the bright line 3 on the cream solder printing section 2
A beam slit illuminator 4 that emits a bright line 3 having an amount of light suitable for photographing
Then, the printed circuit board 1 and the cream solder printing section 2 on which the bright lines 3 are applied are photographed by the camera 5 by contacting the surfaces of the printed circuit board 1 and the cream solder printing section 2.

Such photographing data is synthesized. For example, of the photographing data collected at a light amount suitable for the cream solder printing unit 2, a portion in which the bright line 3 is not visible is synthesized by a synthesizing method or the like in which the photographing data collected at a light amount suitable for the printed circuit board 1 is replaced. Thus, an image as shown in FIG. 4 in which the bright lines 3 are clearly displayed on the printed board 1 and the cream solder printing section 2 can be obtained and displayed on the monitor 7. That is, it is possible to appropriately photograph the bright line 3 between the printed board 1 and the cream solder printing unit 2. Therefore, the inspection of the cream solder printing unit 2 can be easily performed.

In the above example, the case where the cross-sectional shape of the cream solder printing unit 2 is rectangular is shown. However, the cross-sectional shape of the cream solder printing unit 2 is not limited to this. Good.

[0022]

According to the cream solder printing inspection method using the beam slit illumination according to the present invention, the printing is performed in a state where the beam slit illuminator is installed so that the bright line hits the cream solder printing portion and the surface of the printed board at a required angle. Since the inspection is performed on the cream solder printing section by performing shooting with the light quantity suitable for shooting the bright line on the board and shooting with the light quantity suitable for shooting the bright line on the cream solder printing section, The bright line and the bright line on the cream solder printing portion can be clearly photographed, and the bright line can be properly photographed. For this reason, the inspection of the cream solder printing portion can be easily performed.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of an embodiment of a configuration of a cream solder print inspection apparatus by beam slit illumination that implements a cream solder print inspection method by beam slit illumination according to the present invention.

FIG. 2 is a front view showing the configuration of a conventional cream solder printing inspection apparatus using beam slit illumination.

FIG. 3 is a right side view of FIG. 2;

FIG. 4 is a plan view showing a state where a bright line hits a cream solder printing portion and the surface of a printed circuit board.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printed circuit board 2 Cream solder printing part 3 Bright line 4 Beam slit illuminator 5 Camera 6 Microcomputer 7 Monitor

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI // G01N 21/88 G01N 21/88 F (72) Inventor Koichi Miyazaki 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A cream solder printed part printed on a printed circuit board and a cream solder by beam slit lighting for inspecting the cream solder printed part by photographing the surface of the printed circuit board by irradiating bright lines from a beam slit illuminator. In the printing inspection method, in a state where the beam slit illuminator is installed so that the bright line hits the cream solder printing portion and the surface of the printed board at a required angle, a light amount suitable for photographing the bright line on the printed board. A solder slit printing inspection by beam slit illumination, wherein the photographing is performed with a light amount suitable for photographing the bright line on the cream solder printing unit, and the cream solder printing unit is inspected. Method.