JPS5861452A - Inspecting device for appearance - Google Patents

Abstract

PURPOSE:To obtain a perfect one image plane without losing any one scanning signal by performing the light emission of a strobo-scope within the blanking period in the horizontal scanning of a TV camera. CONSTITUTION:The synchronizing signal of a TV camera 3 or the clock signal for determining the address in horizontal scanning lines is generated by a timing signal generator 8. The picture signal of a TV camera 3 is inputted via an AD converter 4 to a storage device 5. For example, when a detecting circuit 6 for image pickup positions detects that the image pickup position comes to the front of the camera 3 during the N-line of horizontal scanning in the TV picture plane as shown by the image signal C of the figure, a preparation signal A for light emission is inputted to a generating circuit 7 for a light emitting trigger at the point t1 of that time, and in the stage of blanking Bn right after the same, said circuit 7 generates a trigger signal B for light emission. A light emitting circuit 14 is operated by the signal B, by which a strobo-scope 13 is operated to emit light. The flash light D thereof annihilates in a blanking period TB. As a result, the image signal irradiated by the strobe is outputted after the horizontal scanning line N+1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a visual inspection apparatus for visual inspection of printed circuit board soldering.

It is possible to capture an image of a moving object as a still image of the TV right camera by using the horizontal illumination. However, since the movement of the subject and the scanning of the TV camera are usually asynchronous, the camera may strike when the subject is at the optimal imaging position. When the camera is turned on, it is often during the horizontal scanning of the 1"V camera. When the light is turned on during horizontal scanning in this way, the horizontal scanning section is dark before the light is emitted, and there is a short period after the light is emitted. However, it is disadvantageous to generate invalid scan lines in important parts of the object, since a correct image signal cannot be obtained.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks and provide a visual inspection apparatus including an imaging device that can utilize all scanning lines within a screen as an effective image signal.

In the present invention, after it is detected that the moving object to be inspected has come to the place to be secured in front of the T''V camera.

The stroboscope is pressed to emit light in synchronization with the subsequent horizontal blanking, and the flash duration of the stroboscope is shortened so that at least the majority of the emitted light energy is emitted within the horizontal 7° ranking period. shall be.

Hereinafter, the present invention will be explained in detail based on the block diagram of an embodiment shown in FIG. W11 and the main part waveform diagram shown in FIG.

The object to be inspected 1, such as a printed circuit board, in FIG. 1 is placed on a sample table 2 and fixed. Although the sample table 2 is omitted in FIG.

For example, move to F)XY under computer control.

Here, on the sample table 2, the inspection location of the object to be inspected is the TV.
Move it so that it passes in front of the camera S. The current position of the sample table 2 is detected by the encoders 11 and 12, while the inspection location in the object 1 to be imaged, that is, the location to be imaged, is detected by the imaging position detection (b) from the combination screen 10.
Route 6 has been informed. Therefore, the image position detection circuit 6
When it is detected at time t1 that the place to be inspected on the object 1 to be inspected has come within the field of view of the TV right camera, a light emission preparation signal A shown in FIG. 2A is generated.

A synchronization signal for the 1'V camera 3 and a clock signal for determining addresses within the horizontal scanning line are generated by a timing signal generator 8. The image signal of the TV right camera is sent to the 7Φ converter 4.
The data is input to the storage device 5 via the . Address designation and write/continuation control of the storage device 5 are performed by the storage device ti control circuit 9.
will do it.

For example, Ffjg in wc2 diagram! ! As shown in signal C, T
During horizontal scanning between eight lines on the V screen, the imaging location is W camera 5.
When the imaging position detection circuit 6 detects that the position has come before , the light emission preparation signal A is inputted to the light emission trigger generation circuit 7 at the time t1, and when the blanking B is entered after that, the corresponding The circuit 7 is the light emission trigger signal B of the stroboscope 13.
The 0 flash preparation signal A that generates the flash trigger signal B is reset after the flash trigger signal B is generated.
The flash disappears during the blanking period TJ. As a result, as shown in the TV screen 15 in FIG.
For +1 and above, the strobe-illuminated image signal is output.

Therefore, the data for one illuminated 11m area is N
Obtained by putting the wood grain running IEI [de into memory device [5]. Such control is executed by the storage device control circuit 9.

As described above, by emitting light from the o-boscope during the blanking period in the horizontal scanning of the TV camera, a complete 1th plane can be obtained without damaging even a single scanning pulse. Shime＼ also has a delay of up to 1 in the light emission timing.
Horizontal scanning time (approximately 60 .mu.I), average only about 50 .mu.zJ/C - no missed image opportunities.

[Brief explanation of drawings]

FIG. 1 is a time chart showing the operation of FIG. 1, and FIG. 3 is a TV screen diagram for explaining the operation of FIG. 1. 1...Object to be inspected 2...Sample table 3.
... TV right camera 4 ... Color converter 5 ... Storage device 6 ... Imaging position detection circuit 7 ... Light emission trigger generation circuit 8 ... Timing signal generation circuit 9 ... Storage device control circuit @ 10... Computer 11. 12... Encoder 13... Stroboscope 14... Light emitting circuit patent attorney Bo 1) Li Shen Figure 2

Claims (1)

[Claims] This visual inspection device is designed to capture an image by emitting light from a stroboscope when an object to be inspected moving in darkness comes to the TV right camera imaging location. A stroboscope with a flash duration at which the source ends, a signal conversion means for converting the image signal of the W camera into 1Φ, a storage means for storing the data after AD conversion, and a confirmation that the object to be inspected has arrived at the position where it should be imaged. a trigger plane wave that generates a light emission trigger signal sound for causing the stroboscope to generate the stroboscope within the horizontal blanking period of the TV right camera based on the light emission preparation signal; 1h of I from horizontal scanning immediately after light emission! I1gI! An external appearance inspection device comprising: a companion tk device control means for writing data into the storage device.