SU561979A1 - Graphic reading device - Google Patents

Description

The invention relates to the field of automation and computer technology, in particular, to devices for reading graphic information and can be used in a digital reading machine of an automatic and sorting machine.

A device for reading graphic information is contained, comprising an electron-optical conversion unit connected to the sweep formation units and a video signal forming block, a speed sensor connected to a control unit connected to one of the sweeps forming sweeps, logic elements And, Or, and a pulse generator Ij .

1 This device has low accuracy.

It is also known a device for reading graphic information comprising a transfer unit for media, optically coupled to a photomultiplier tube connected to a video signal forming unit, and through a lens with a cathode ray tube connected to a synchronization unit, to a scanner along the vertical and with a saw generator. , the pulse generator connected to the logical element And, and the speed sensor 2J.

The specified device has a low resolution and accuracy of reading graphic information.

The aim of the invention is to increase the resolution and accuracy of the device.

“This is achieved by the fact that the proposed device contains a switching unit connected to a sawtooth voltage generator through a logic element AND to a speed sensor and to the input of the IlMpulsov generator, and a time reference unit connected between the output of the switching unit and the sawtooth voltage generator.

The drawing shows a block diagram of the device.

The device includes a transfer unit 1 of the information carrier 2 in front of the frame window 3, a lens 4, a photomultiplier tube, a video signal forming unit b, a vertical scanner / EL G 8, a block

synchronization 9, speed sensor 1U, pulse generator 11, logic element AND 12, switching unit 13, time setting unit 14, containing the time of the master circuits 1b and sawtooth voltage generator 16.

The device works as follows.

The storage medium 2 is advanced by block 1 past the speed sensor 10, the output of which forms a sequence of pulses with a frequency that is proportional to the speed of advancement of the storage medium. This sequence of pulses is fed to the first input of the logic element 12 and to the input of the pulse generator 11, which is triggered by the first pulse from the speed sensor 10 and does not respond to all subsequent pulses. At the output of the generator 11, a reference time pulse is generated, which enables the operation of logic element I 12. At the output of logic element 12, a sequence of pulses is formed, the number of which is proportional to the speed of advancement of information carrier 2. The specified sequence of pulses affects the switching unit 13, which connects one of the times Their chains 15 of block 14 to the input of the sawtooth voltage generator 16. At the moment when the information carrier 2 leaves the front edge to the reading position at the output Lok sync 9 is a signal which unlocks the cathode-ray tube 8 and comprises a sawtooth generator 16. l tim vertical scanner 7 operates in a continuous mode. A raster is formed on the screen of the cathode ray tube 8, which is projected into the frame window 3 with the aid of lens 4. A medium 2 on which the readable image is plotted is advanced in front of the frame window 3. The light flux of the scanning spot reflected from the read image is perceived by the photomultiplier 5. Electrical signals from the output of photomultiplier 5 are supplied to the video signal conditioning unit 6, the output of which produces electrical signals proportional to the read graphic image.

The introduction of new units and new structural links made it possible to increase the resolution and accuracy of the device by 1.2-1.3 times.

Claims (2)

1. The patent of Germany No. 1424832, cl. 42t "9/12, publ. 03.10.74. 2. US patent number 3643069, cl. 235-61.11, publ. 1972 (prototype).