JPH0251003A - Apparatus for detecting position of small hole - Google Patents

Abstract

PURPOSE:To automatically detect the two-dimensional address of a small hole by determining the position of a small hole on the basis of the AND of an image signal pulse wherein the pattern film of a printed circuit board is binarized and the pulse having a time width slightly wider than the diameter of the small hole generated in response to said signal pulse. CONSTITUTION:When a black ring-shaped encircled region 18a is scanned at each line scanning time of an X- axis, an image signal pulse (a) of an H-level is generated. At this time, a monostable multivibrator 11 generates a pulse signal P12 at the point of time when a brightness change from black to white is generated and outputs an AND signal P13 through a NAND gate 10. The output signal of the gate continuous in succession is held to shift registers 21 - 24 and, when the signal corresponding to the signal P13 coinciding with all of the registers 21 - 23 timewise is present, a small hole detection signal (b) is outputted. By this method, a small hole address signal is outputted from an address signal output circuit 33. Therefore, the two-dimensional address of a small hole can be automatically detected.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is directed to detecting the two-dimensional address of a small hole surrounded by areas of different brightness on a plane such as a pattern film of a printed circuit board. The present invention relates to a position detection device.

(Prior Art and Problems to be Solved by the Invention) Conventionally, holes in printed circuit boards have been automatically performed using an NC device. There was no device that automatically detected two-dimensional positions.

Therefore, an object of the present invention is to provide a small hole position detection device that automatically detects the two-dimensional address of a small hole surrounded by areas of different brightness on a plane.

(Means for Solving the Problems) In order to achieve this object, the present invention reads and scans a plane l in a line shape, and sequentially shifts the line position in the right angle direction, as shown in FIG. an image sensor 2 that outputs a video signal while
a pulse generating means 3a for generating a pulse P2 having a time width corresponding to a line scanning time slightly wider than the diameter of the small hole 8 at the leading edge of the small hole 8 in response to the converted video signal pulse P1; and a logical product means 3 which inputs the pulse P and the video signal pulse PI, and at least the newest scanning line and the oldest scanning line of the N tree, which is the number + 1 tree that sequentially covers at least the small hole 8 of each scanning line. time delay means 4 for time-delaying the output signal of the AND means 3 so that the addresses of these scanning lines can be synchronously compared;
, the non-time-delayed output signal of the AND means 3, and N consecutive output signals of the AND means 3 supplied from the time delay means 4.
Look at the first scan line with no time delay as the output signal is input. and the oldest scanline statement delayed in time,
The logical product signal P is not read out from the output signal of , and the logical product signal P1 is not read from the latest scan line or from multiple scan lines including this scan line for the remaining N-1 scan lines. When detected, a small hole determining means 5 determines that a small hole exists and outputs a small hole detection signal, and a small hole address outputs a two-dimensional small hole address signal corresponding to the detection time of the small hole detection signal. The signal generating means 6 is also provided. If the stoma address signal is to be used repeatedly, the stoma address signal generating means 6 is provided with a storage means 7 for storing the stoma detection signal.

(Function) The image sensor 2 reads and scans the plane l in a line shape, and sequentially shifts the line position in the right angle direction. As a result, as shown in FIG. 2, when the surrounding area 8a of the small hole 8 is line-scanned, a binarized video signal pulse P is first generated.

The AND means 3 receives the video signal pulse P1 as well as the pulse P2 generated at the time when the brightness of the leading edge of the small hole 8 changes during line scanning, and the 0-time delay means 4 outputs the AND signal Pff. The output signal of the AND means 3 of the input N-tree scanning lines to be delayed is delayed so that the addresses of each scanning line are synchronized.

As a result, the small hole determining means 5 detects the temporally first scanning line that is not delayed among the N+1 scanning lines. and the oldest delayed scan line does not have the AND signal P3, while for the remaining N-1 scan lines, the newest delayed scan line or including this scan line does not exist. The AND signal P3 is detected from multiple scanning lines (in Figure 2, there is only one tree; in Figure 3, there are six lines from 1 to sentence 6 at most within a time width T corresponding to the radius). Then, it determines that a small hole exists and outputs a small hole detection signal.

The small hole address signal generating means 6 outputs a two-dimensional small hole address signal at that time every time a small hole detection signal is generated. If necessary, this signal can be output after correcting the deviation between the actual hole center position and the input point of the small hole detection signal. Further, these address signals can be stored in the storage means 7 for repeated use.

Incidentally, when a slit in the scanning line direction is read out and scanned, it can be distinguished from a small hole because no pulse P2 or Pl is generated. Further, in the case of a slit in a right angle direction, it can be distinguished from a small hole by generating the AND signal P3 also in the scanning line outside the circle in the right angle direction of the area corresponding to the small hole.

(Embodiment of the invention) FIG. 4 shows a small hole position detection device according to an embodiment of the invention.

In the same figure, the TV left camera 9 images the printed circuit board film 17 where the copper foil part is black and the other parts are transparent, and the video signal is transmitted to the Nant gate lO as the AND means and the monostable as the pulse generating means. Multi vibrator 11
is supplied to That is, when the black ring-shaped surrounding area 18a of the small hole 18 is line-scanned, a binarized video signal pulse a is generated, and this pulse a and the video signal pulse a are combined in the monostable multivibrator 11. A gate signal P12 generated at the falling edge and corresponding to a scanning time width slightly larger than the diameter of the small hole 18 is input to the gate signal P12 (Nant Gate)-10.

Reference numerals 21 to 24 designate shift registers that serve as time delay means for the output signal of the Nandt gate 10 and are constructed in four stages because the number of scanning lines crossing the small hole 18 is three. Then, the output signal of the Nant gate 10 is supplied to the shift register 21 in the first stage, and is sequentially transferred to the shift registers 22 to 24 in the subsequent stages by a clock.

28 is a Nant gate that functions as a small hole determination means, and the output signals of the shift registers 21 to 23 are sent to the inverter 2.
5 and inverted, and the output signal of the Nant gate 10 and the output signal from the shift register 24 are input as they are. As a result, the pulse width of the output signal corresponding to the AND signal P13 of these shift registers is slightly wider than the radius of the small hole 18 (without interfering with the AND signal of another small hole, and to prevent detection errors). ), and when these signals occur within a time period equivalent to the radius, the shift registers 21 to
A coincident time occurs when all the output signals from 23 become H level, and a small hole detection signal S at L level is output.

31 is a counter that counts the X-axis step pulses of the TV left camera 9 and is reset each time each line is scanned; 32 is a counter that counts the Y-axis step pulses and is reset each time one screen scan is completed;
- As soon as the small hole detection signal from the Nant gate 28 is input, the count values of these X and Y axes are taken in as address signals, and the input point and the actual center of the small hole 18 are input. Together with an address signal output circuit 33 that outputs an address signal after correcting an assumed deviation from the address of the current row, the small hole address signal generating means is constituted. 39 is a memory for storing the small hole position signal on the two-dimensional plane of the X and Y axes.

The operation of the small hole position detection device configured as described above is as follows.

When scanning each line on the X-axis, a black ring-shaped surrounding pattern VT18
When the signal a is scanned, an H level video signal pulse a is generated. At this time, the monostable multivibrator 11 generates a pulse signal paffi at the time when the brightness changes from black to white, and during this time, when the video signal pulse a of the black surrounding area 18a is input to the NAND game 110, logic t! double signal 13
Output. The output signals of four successive Nantes gates 10 are held in the shift registers 21 to 24, and each time the contents are sequentially transferred using the progressive clock of the X-axis backward scan, a match is determined in the Nantes gate 28. or will be done. Then, the Nantes gate 10 and the shift register 2
If only the AND signal PI3 does not exist in the output signal of No. 4, and there exists a signal corresponding to the AND signal PI3 that coincides in time with all of the remaining shift registers 21 to -23, the small hole detection signal S is activated. Output. The counters 31 and 32 sequentially count up the clocks for X-axis scanning and Y-axis scanning, and the address signal output circuit 33 corrects the count value at the time of inputting the small hole detection signal and A small hole address signal is output as the address of , and is stored in the memory 3g.

Note that in the above-described embodiments, a memory such as a RAM may be used instead of the shift register as the time delay means.
In the Nantes gate 28, which functions as a small hole determination means, the intended purpose can be achieved even if only the output signal of the Nantes gate 10 and the output signals of the shift registers 21 and 24 are inputted for determination. As the image sensor, it is also possible to mechanically shift a line image sensor in the right angle direction.

(Effects of the Invention) As described above, according to the present invention, the two-dimensional address of a small hole displayed in contrast on a plane can be automatically detected. This makes it possible to efficiently operate an automatic device that performs hole processing such as drilling small holes based on the detection signal.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of the present invention, FIGS. 2 and 3 are diagrams explaining its operation, and FIG. 4 is a diagram showing the configuration of a punching device according to an embodiment of the present invention. l...Plane, 2...Image sensor, 8.1
8... Small hole, 8a, 18a... Surrounding area. 19...TV camera.

Claims (1)

[Claims] 1) A small hole position detection device for detecting a two-dimensional address of a small hole surrounded by areas of different lightness on a plane, the device comprising: reading and scanning the plane in a line; an image sensor that outputs a video signal while sequentially shifting the line position in the right angle direction; pulse generating means for generating a pulse with a time width corresponding to a line scanning time slightly wider than the diameter; AND means for inputting this pulse and the video signal pulse; a time delay for delaying the output signal of the AND means for at least the newest scanning line and the oldest scanning line among the N scanning lines, which is the number of lines covered + 1, so that the addresses of these scanning lines can be synchronously compared; means, inputting the non-time-delayed output signal of the ANDing means and the maximum N output signals of the ANDing means supplied from the time-delaying means, and inputting the non-time-delayed first scanning line and the time-delayed The AND signal is not detected in the output signal of the oldest scanning line, and for the remaining N-1 scanning lines, the newest scanning line or a plurality of scanning lines including this scanning line a small hole determination means that determines that the small hole exists and outputs a small hole detection signal when the logical product signal is detected from the small hole detection means; and a two-dimensional small hole address corresponding to the detection time point of the small hole detection signal. A small hole position detection device comprising: small hole address signal generating means for outputting a signal. 2) The stoma position detection device according to claim 1, further comprising a storage means for storing the stoma address signal outputted from the stoma address signal generating means.