SU1187271A1 - Device for checking dimensions of raster elements - Google Patents

Description

The invention relates to measurement technology and can be used to automatically control the width of the elements of the raster lines. five

The aim of the invention is to improve the accuracy of the device when monitoring the linear dimensions of individual elements to rasters of glass raster measures.

FIG. 1 shows the optical scheme of the device; in fig. 2 plot of opaque and transparent elements of the controlled raster; in fig. 3 - performance and arrangement of photoresistors; in fig. 4 arrangement of device masks} in FIG. 5 is a diagram of the device.

The device contains a light source 1, a co-sensor 2, ', ·' projection lens 3, differential photoresistors 4 and 5, separated by an interelectrode distance 6, masks 7 and 8, made with auxiliary bars 9 and 10 and measuring bars 11 and 12, as well as amplifiers 13 and 14, the elements NOT 15 and 16, the element And 17, the amplifier 18 DC, multivibrator 19, the counter And 20, resistors 21-24. In addition to that, in FIG. 1 shows opaque and transparent strokes 25-1 and 25-2, respectively, of the raster 26, which are its elements.

The device works in the following way.

A raster 26 is placed between the con-. sensor 2 and projection lens 3 so that the enlarged opaque element 25-1 raster 26 40

projected onto masks 7 and 8. This should ensure the parallelism of the edges of strokes 25-1 and 25-2 of raster 26 and measuring strokes 11 and 12 of masks 7 and 8. Measurement is carried out when the raster 26 moves in the direction perpendicular to the measuring line 11 or 12 masks 7 or 8. When measuring, the distance from the plane in which 50 the raster 26 moves to the plane of the masks 7 and 8 should be constant. When moving the raster 26, the measuring lines 11 and 12 are illuminated or not illuminated. When the width of 55 on the enlarged opaque element 25-1 is equal to the period H, a moment comes (when moving

raster 26) complete overlap of measuring bars 11 and 12. In this case, the bridges composed of a differential photoresistor 4 and resistors 21 and 22 (photoresistor 5 and resistors 23 and 24 for the second bridge) are balanced. As a result, the voltage across the diagonal of each bridge will be minimal (approximately zero). This voltage through the amplifiers 13 and 14 is fed to the inputs of the elements NOT 15 and 16, respectively. At the outputs of ale> -! cops NOT 15 and 16 sets the voltage corresponding to a logical unit.

The signals from the outputs of the elements 15 and 16 are fed to the element And 17. The signal from the output of the element And 17 is fed to the input of the amplifier 18 DC.

After amplification, the signal enters the multivibrator 19. It produces a single pulse, which is fed to the counter 20.

Thus, each time with the overlap of the measuring lines 11 and 12 of the masks 7 and 8, the counter 20 calculates one counting pulse.

Therefore, when moving the raster 26 and projecting the strokes 25-1 and 25-2 of the raster 26 to the masks 7 and 8, the counter 20 calculates the number of opaque strokes 25-1 of the raster 26.

The device issues a counting signal to the counter only when projecting a 25-1 raster 26 to masks 7 and 8 with a width equal to con, stantage the masks, for example H = 0.5 N, and does not respond to opaque strokes 25-1 with a width different from b ...

Suppose that masks 7 and 8 with a constant b project an opaque stroke. 25-1 width L-AB.

When bar 11 is closed for the passage of light, bar 12 will not be completely closed and vice versa. Thus both bridges cannot be balanced at the same time. As a consequence, the counter 20 does not calculate the impulse. The device does not react if masks 7 and 8 with a constant AND are projected a stroke of 25–1 raster L 4 D (ι. In this case, there comes a time when strokes 11 and 12 are closed, but part of the opaque stroke is 25–1 wide d b at 1187271

it covers an auxiliary stroke of 9 or 10. In this case, both bridges cannot be balanced at the same time, i.e. the counting pulse at the output of the counter 20 will not. five

The device allows you to control the width of the transparent strokes 25-2 raster 26. For this, you must first

1

~ 7

4.5

to weigh the bridges of differential photo resistors 4 and 5, which is done with open lines 11 and 12 for access and closed bars 3 and 10, while it is necessary to change the resistance value 21-24. The process of controlling transparent strokes is not fundamentally different from measuring opaque strokes.

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1187271

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Branch "School of Economics" Patent ", Uzhgorod, Projecto st., 4

Claims (1)

A DEVICE FOR MONITORING THE DIMENSIONS OF THE RASTER ELEMENTS, containing an optically coupled light source, a capacitor, a projection lens and a photodetector, characterized in that, in order to improve the accuracy of the device, four registers, two amplifiers, a power source, two HE elements, and , dc amplifier, multivibrator and the counter, and the photodetector is made of two parallel-spaced differential photoresistors on which two masks are applied, each of them has two transparent strokes; transparent strokes of one mask shift relative to transparent strokes of the other mask by half of the period Н, where Н is the period of alternation of elements of the controlled raster , the first and second terminals of the first and second differential photoresistors are connected to the corresponding power supply outputs and to the first terminals of the first, second, third, fourth resistors, respectively However, the second terminals of the first, second, third and fourth resistors are connected to the first inputs of the first and second amplifiers, respectively, the second inputs of which are connected to the third terminals of the respective differential photoresistors, and the outputs through the corresponding elements NOT to the first and second inputs of the AND element, the output of which series-connected DC amplifiers and a multivibrator connected to the input of the meter. SL 1187271 one 1187271 2