SU1247907A1 - Graphic information input device - Google Patents

Abstract

The device relates to a technique for converting graphic information and can be used to create a graphics subsystem for information and computing systems. The chain of the invention is to increase the accuracy of the device. This goal is achieved by the fact that the device contains a movable carriage two-coordinate mechanism, position-sensitive photodetectors, which provide the possibility of optical tracking of the information puller. 2 pcs. S cl)

Description

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The invention relates to the transformation of graphic information and can be used in the creation of a graphical subsystem of information and computing systems.

The purpose of the invention is to increase the accuracy of the device.

FIG. 1 and 2 schematically shows the proposed device ..

The device contains a coordinate tablet 1, a computing unit 2, the pulse outputs of the coordinate increments of which are connected to the control inputs of the two-coordinate mechanism 3, located on the outer side of the tablet 1. On the movable carriage 4 of the two-coordinate mechanism 3 there is a recording unit 5 connected to the control of the block control 2, as well as the carrier bracket 6. In addition, the device contains an information puller 7 connected to the synchronizing pulse output of the unit 2 and optically connected to the fixed The arms 6 on both sides are mutually perpendicular and fixed in the same light insulating screens 8 are installed in pairs f by position-sensitive photodetectors 9, which are connected to the differential inputs; computing unit 2. The optical connection of the receiver 9 with the information remover 7 is carried out by means of 6 mounted on the arm 6 parallel to each other and at an angle of 45 ® to the light insulating screens 8 of the guide mirrors 10.

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The information picker 7 is a point emitter of light and can be made in the form of a pencil or reticle with a magnifying glass; containing, for example, a reflector in the form of a cone or a cylinder that is irradiated by an LED, and to eliminate the influence of external illumination, an infrared and a long-range light emitting diode can be used. and differential positional sensing elements, the output electrical signal of which is proportional to the magnitude of the sensor voltage, which the light beam is directed at from the center of the element.

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If the dimensions of the photodetectors do not allow to achieve the required accuracy of recording the movements of the puller, they may include LEDs mounted closely, transmitting the light flux to the light-sensitive elements remote from the screens.

FIG. 2 shows one of the possible embodiments of the computing unit, where a communication element with a computer 11, interpolator 12, elements OR 13, elements AND 14, a pulse generator 15 and amplifiers 13 are shown.

The increment signals of the coordinates + x from the outputs of the elements OR 13 are the output signals of block 2, along which the carriage moves. along the X axis. The indicated outputs are also connected to the inputs of the reversible coordinate counter XI7, the outputs of the coordinate codes of which are connected to the inputs of the interface with the computer. The control channel on the Y axis is identical to that described and not shown.

The device works as follows.

The radiation of the information remover 7, reflecting from the mirrors 10, reaches the sensitive surfaces of the photodetectors 9. Each pair of photoreceivers 9 located at one of the light-insulating screens 8 enters into the computing unit 2 the descaling signals according to their coordinates. When the location of the point emitter of the puller 7 is not matched with the tracking center in the pair of photodetectors 9, the difference in illumination arises, thereby signaling the mismatch signals. illumination of a pair of photodetectors 9. Cyclic execution of the indicated operations with the frequency of arrival of synchronizing pulses on a point emitter of a puller echivaet possibility of tracking the movement of the carriage puller.

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Since the current position coordinates of the mobile carriage 4 are constantly generated in the computing unit 2 in the course of operation, to obtain digital coordinate codes

It is sufficient to set the frequency (with the contour bypassing) by the operator's signal (when digitizing individual points) to transfer the current carriage coordinates to special registers, provided that the puller is at the given moment in the center of tracking.

Thus, a one-to-one correspondence is established between the coordinates of the point indicated by the puller, generated by the computing unit 2 with the digital codes and the coordinates of the point reproduced by the recording node on the tablet according to these digital codes. ,

The visual control of the input information, as well as the output from the computer of images generated by the input reference points, can be performed using the recording unit 5 mounted on the carriage 4 moved with the help of the two-coordinate mechanism 3 under the control of unit 2 in accordance with digital codes.

D79074

Claims (2)

coming from the computer, or formed in the computing unit 2. The formula of the invention A device for entering graphic information containing coordinate,. a tablet with a movable carriage, an information remover, two photodetectors installed on the movable carriage, and a computing unit, the photodetectors being connected to the coordinate inputs of the computing unit, which is designed to increase the accuracy of the device; the carriage, the information puller is made in the form of a light pen with a point emitter, optically connected with photodetectors made by position-sensitive ten 15 20 The output output of the computing unit, the output of the coordinate increments of which is connected to the control inputs of the two-coordinate mechanism, the coordinate outputs of the computing unit are the information outputs of the device