SU798910A1 - Graphic information reading out device - Google Patents

Description

(54) DEVICE FOR READING GRAPHIC INFORMATION

dindricheskih coils and remover coordinates; figure 2 - block diagram of the device.

The quantity of electromotive force (EMF) induced by the alternating magnetic field of two cylindrical coils located on the plate at a previously known base distance from each other (Fig. 1) is used as a physical quantity simulating the distance.

Each image point in which the target viewer overlap of the coordinate remover is established by alternately exciting cylindrical coils corresponds to a certain value of the induced EMF in the receiving coil of the coordinate remover. The magnitudes of the EMF are uniquely determined, respectively, by the distances of the AU and BC. Characterizing the location of the read points C. Signing the segments AB (base) of the LS and BC, it is easy to go to the rectangular coordinates (x, y) in the system, one of the axes of which goes along the straight AB,

The proposed device contains two identical cylindrical coils 1 and 2, which are connected through the first switch 3 current pulses to the generator 4 current pulses, associated with the control unit 5, the coordinate remover b having induction coupling with coils 1 and 2 and connected through an amplifier 7 to the control unit 5 and the analog memory block 8., the analog-digital converter 9, the input connected to the analog memory block 8, and the output via the decoder 10 of the distance code and the second switch 11 to the output registers 12 and 13 of the coordinates .

The device works in the following way.

After setting the puller of the b coordinates at the point of reading, the operator, behind the IvjbiKaeT Start button (not shown), is mounted into the puller housing. In this case, the output control unit 5 starts the generator of 4 current pulses, which, through switch 3, the control unit 5 of the output control, outputs a powerful current pulse to the coil 1 with a steep leading edge. As a result, There is a magnetic field whose strength is cHMivieTpH4Ha relative to the center of the coil (point A, figure 1). An alternating magnetic field induces an emf in the receiving coil of the puller, the value of which is proportional to the removal of the receiving coil from the coil 1 of the radiator of the magnetic field. The induced signal is amplified by amplifier 7 and is fed to the analog block B of the memory and at the entrance to the block 5 laziness. In response, the control unit 5 to the output (5 starts the analog-digital

converter 9, which is a converter; imposes the amplitude of the induced signal; In this case, the amplitude of the transducer in the puller 6 is due to the nonlinear function of the distance between the radiating and receiving coil,. information from the output of the analog-to-digital converter 9 is

 only conditional codes that uniquely correspond to the distance between the coils. To represent linear segments in metric with a code, the code from the information outputs of the analog-digital.

5, the converter 9 enters a distance code decoder 10, which converts the CONDITIONAL code to a true distance code, the latter through the switch 11 codes, controlled by block 5

0 exit control §, entered

to the corresponding output register. coordinates, for example, register 12,

The distance BC is determined analogously, and the corresponding code is fixed on register 13 of the coordinate.

The proposed device can significantly simplify its structure, f. reduce the amount of equipment required and eliminate the need for an expensive matrix tablet. This device is located practically in any workplace of the operator (desk, drawing table, etc.).

The economic effect arises in the manufacture of the device and is caused by replacing the plate and switching equipment of the coordinate buses with two cylindrical coils and 40 code decoder.

Claims (1)

Invention Formula -.- f A device for reading graphic information containing a plan - -. a sheath, an induction coordinate remover connected via an amplifier and an analog memory block to an analog-to-digital converter, coordinate registers whose inputs are connected to the outputs of the first switch, a current pulse generator connected to one of the inputs of the second switch, the other input of which is connected to one from the outputs of the control unit, the other outputs of which are connected to the corresponding control inputs of the generator of current pulses, the first switch and the analog-digital converter, and the input to the output of the amplifier, of which In order to simplify the device, it contains magnetic field emitters, made in the form of two cylindrical coils installed in corners plan