JPH081487Y2 - Appearance inspection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a visual inspection apparatus for a printed wiring board having landless holes.

[Conventional technology]

Conventionally, this type of appearance inspection apparatus has a landless through hole 15 shown in FIG. 7 on an inspection table 8 as shown in FIG.
A printed wiring board 7 having a printed wiring board 7 is placed and connected to the computer 1 through the input / output unit 3 by a signal line 4, and a printed wiring having a landless through hole 15 as shown in FIG. The light irradiation mechanism 6 for irradiating the plate 7 obliquely from above and the computer 1
Is connected to the signal line 4 via the input / output unit 3, and the reflected light of the signal circuit 14 and the landless through hole 15 of the printed wiring board 7 having the landless through hole 15 is captured by the CCD camera 5a according to the instruction of the computer 1. , Captured light 1
3 is converted into an electric signal, and electric signal data is input to the computer 1 via the signal line 4 and the input / output unit 3.
The CCD camera 5a, the computer 1 for performing binarized image processing of the input electric signal, and the XY-axis drive mechanism control circuit 9 connected to the computer 1 via the input / output unit 3 by the signal line 4 are provided. And has the XY through the signal line 4.
The CCD camera 5a and the light irradiation mechanism X-axis 10 and Y-axis drive mechanism 11 connected to the axis drive mechanism control circuit 9 are operated to perform a visual inspection of the printed wiring board 7 having the landless holes 15. Reference numeral 14 denotes a signal circuit on the printed wiring board 7.

[Problems to be solved by the device]

The above-described conventional appearance inspection device cannot sufficiently capture the reflected light of the landless through hole, all the landless through holes are detected as pseudo defects, and the printed wiring board having the landless through holes cannot be inspected. was there.

An object of the present invention is to provide a visual inspection apparatus that solves the above problems.

[Differences of the invention from the prior art]

In contrast to the conventional visual inspection of the printed wiring board having the landless through holes described above, the present invention has the difference that the landless through holes are not pseudo defects.

[Means for solving the problem]

In order to achieve the above-mentioned object, in the appearance inspection apparatus according to the present invention, a light transmission inspection table for setting a printed wiring board having landless holes and a computer connected via a signal line to an input / output unit of the computer. A light irradiation mechanism for irradiating light to the printed wiring board obliquely from above according to an instruction, and a signal circuit of a printed wiring board having a landless through hole connected to the computer by a signal line through an input / output unit, and Two CCD cameras that capture the reflected light of the landless hole, convert the captured light into electrical signal data, and input the electrical signal data to the computer through a signal line and an input / output unit, and The computer for performing binary image processing on electric signal data of two CCD cameras, and the computer. Those having an XY-axis driving mechanism control circuit connected by a signal line via the output unit to terpolymers.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a block diagram of an appearance inspection apparatus according to an embodiment of the present invention.

In the figure, 1 is a computer composed of electronic components such as ICs, 2 is a keyboard, 3 is an input / output unit for inputting / outputting data to / from the computer 1, 4 is a signal line, 5a and 5b are signal circuits and landless holes. Two upper and lower CCD cameras that capture reflected light, 6 is a light irradiation mechanism that irradiates light,
7 is a printed wiring board having landless holes, 8 is a transparent inspection table that transmits light, 9 is an XY-axis drive mechanism control circuit that controls the X-axis and Y-axis drive mechanisms according to instructions from the computer 1, and 10 is a vertical X-axis. An axis drive mechanism, and 11 is a vertical Y-axis drive mechanism.

Next, the inspection principle of the appearance inspection apparatus of the present invention will be described with reference to FIGS.
It will be described with reference to the drawings.

First, the printed wiring board 7 having the landless holes 15 is placed on a transparent inspection table 8 which transmits light as shown in FIG.

Next, a movement instruction to the upper and lower CCD cameras 5a, 5b and the light irradiation mechanism 6 is instructed from the computer 1 to the XY axis drive mechanism control circuit 9 via the input / output unit 3, and the XY axis drive mechanism control circuit 9
Operates the vertical X-axis and Y-axis drive mechanisms 10 and 11 based on the movement instruction of the computer 1 to move the vertical CCD cameras 5a and 5b.
Also, the light irradiation mechanism 6 is moved back and forth and left and right. Then the second
As shown in the figure, the light irradiation mechanism 6 includes a landless hole 15
The printed wiring board 7 having the light is irradiated with the light 13. Illuminated light
The light 13 is reflected by the signal circuit 14 of the printed wiring board 7 and input to the upper CCD camera 5a, and the light reflected in the landless through hole 15 passes through the transparent inspection table and is input to the lower CCD camera 5b. . Input light 13 data is upper and lower CCD
The cameras 5a and 5b are sent as electric signals from the input / output unit 3 of the computer 1 to the computer 1 through the signal lines 4. The sent electric signals are binarized by the computing function of the computer 1, and the upper CCD camera is used. Binarized image 12a inputted from 5a and subjected to binarized image processing as shown in FIG. 3 and binarized image 12a inputted from the lower CCD camera 5b and subjected to binarized image processing as shown in FIG. Image 12b is obtained. Next, since the range of the binarized image 12b obtained in FIG. 4 is a non-defective range, the range shown in FIG.
The recognition process is individually performed on the binarized image 12c, and the visual inspection of the printed wiring board 7 having the landless through holes 15 is performed without recognizing the landless through holes 15 as pseudo defects.

[Effect of device]

As described above, according to the appearance inspection apparatus of the present invention, the appearance inspection of the printed wiring board having the landless through hole can be accurately and accurately performed at a high speed, and the cost can be reduced by drastically reducing the inspection man-hours of the printed wiring board having the landless through hole. It has the effect that it can be achieved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a sectional view showing a light reflection path in the embodiment, and FIG.
The figure which shows the image which carried out the binarized image processing of the electric signal input from the CCD camera, and FIG. 4 is the figure which shows the image which carried out the binarized image processing of the electric signal input from the upper CCD camera.
FIG. 7 is a diagram showing a binarized image subjected to recognition processing, FIG. 6 is a configuration diagram showing a conventional appearance inspection device, and FIG. 7 is a sectional view showing a light reflection path of the conventional appearance inspection device. 1 ... Computer, 2 ... Keyboard 3 ... Input / output section, 4 ... Signal lines 5a, 5b ... CCD camera, 6 ... Light irradiation mechanism 7 ... Printed wiring board, 8 ... Inspection table 9 ... XY axis drive mechanism control circuit 10 …… X axis drive mechanism, 11 …… Y axis drive mechanism 12a, 12b, 12c …… Binarized image, 13 …… Optical 14 …… Signal circuit, 15 …… Landless through hole

Claims (1)

[Scope of utility model registration request] 1. A light-transmissive inspection table for setting a printed wiring board having landless holes and a signal line connected to a computer through an input / output unit, and light is obliquely upward with respect to the printed wiring board according to an instruction from the computer. From the light irradiation mechanism for irradiating from the computer, the signal circuit of the printed wiring board having a landless through hole and the reflected light of the landless through hole connected to the computer by a signal line via the input / output unit and captured by the computer, are captured. The converted light is converted into electric signal data, and the electric signal data of the two CCD cameras that input the electric signal data to the computer through the signal line and the input / output unit and the inputted two CCD camera are binary. XY connected to the computer for image processing and a signal line connected to the computer via an input / output unit Appearance inspection apparatus characterized by having a drive mechanism control circuit.