SU714454A1 - Displacement-to-code converter - Google Patents

Description

(54) DISPLAY TRANSFER TO CODE

Claims (2)

The invention relates to the field of automation and computer technology, k., Displacement converters. A displacement transducer is known in the code comprising a code disc having light-tight and light-transmitting portions. The source directs the light to the disk, in agglivability from the position of which the combinative excitation of the sensitive elements, issuing coding signals W, occurs. The closest in technical essence is a device containing a movable part, a reading unit, a code forming unit. A number of detectors and a threshold device are included. The drawbacks of the device are the following. Firstly, the presence of a charge detector cuts down, and moreover, the performance of the circuit, and this creates a significant delay in transmitting the signal from the receiving unit to the threshold device, which depends on the constant charge capacity of the detector. Secondly, the presence of a disastrous price for detek-Topai condator-resistance reduces the exact conversion, because during the discharge process the level of the voltage on the capacitor does not remain constant, but decreases. In addition, the accuracy is adversely affected by the presence of a final backward diode resistance, which accelerates the discharge of capacitors. Thirdly, this design has low adaptability, since due to the variation of the parameters of the forward and reverse resistance of the diodes, the values of the capacitances, each detector is individually tuned, and the adjustment of the trimming matching only reduces the paragonality caused by the variation of these parameters, but not frighten The goal of izofeteniya is to increase the speed of the converter. This is achieved by introducing bit cells and formers in the code generation unit according to the number of orders, daph trimming elements n the output trigger, the first output of the readout unit is connected to the input of the threshold device, the output is connected to the first input of the discharge cell, the second output of the reader through the shaper is connected to the inputs of differentiating amps and the input of the discharge cell, the output of the first differentiating element with the union of the third input pa p dyoy cell output of the second differentiating member is connected to the quat | etym entrance discharge cell, the first output zdnoy discharge cells connected to the first input of the output flip-flop, the second output - to a second input of the output three ger. The cell discharge is performed on the elements I and the trigger, the first and second inputs of the discharge cell are connected (correspondingly with the first and second inputs of the first element I, the output of which is connected to the first input of the trigger and the first output of the second cell, the third output of the random cell is connected to the second input of the trigger, the output of which is connected to the first input of the second element I, the fourth input of the bit cell is connected to the second input of the second element I, the output of which is connected to the second output of the bit cell. In Fig. 2, a time diagram of its operation. --- ..-, the converter contains a movable part, made in the form of a code scale 1, moving near the reading unit 2, the outputs of which are connected to the driver 3 and the discharge threshold device 4 (a single-bit diagram is shown in the drawing; in order to attain specifically specified values of output pulse durations or random disconnections, etc., in a number of cases not one, but one of the formers are included in the converter). The outputs of the imaging unit 3 are connected to the inputs of the discharge cell 5 directly, as well as through the first and the second differentiating elements 6 and 7. The cell 5, containing the first and second elements 8 and 9 AND, trigger 10, is connected to the inputs of the HOIX) trigger 11. Elements 3-11 constitute a code generation unit 12. The converter works as follows. Depending on the position of the code slits 1, at the output of block 2, amplitude modulated signals of alternating voltage triggering shaper 3 (Fig. 2) appear. When amplitudes of the output signals of block 2 reach the threshold value of the device 4 cells 5 begin to receive pulses that set the trigger 10 to the zero state. The transition of the trigger 10 to the unit state corresponds to the starting moment of the imaging unit 3, then the ecib input to the input of the trigger 10 pulses from the element b, which differentiates the leading edge of the triggering of the imaging unit 3, the duration of the output and my circuits in the imaging unit 3 is selected from the condition of the most significant time necessary for reaching the output signals of the block 2, the levels of triggering the discharge of threshold devices 4, i.e. the signals from the output of the element 7, which differentiate the falling edge of the pulses f The lighter 3 receives the input of element 9 and cell 5 always after the signals from the output of device 4 (within the pulse repetition period at the output of elemeeite 6), as a result, from the output of element 9 and groups of pulses start to flow to the output of output trigger 11 (FIG 2), and the duration of the arrival interval of the group corresponds to a high level of output signals of the reading unit 2, the unit position of the code scale 1, as well as the unit state of the output of block 11 trigger 11. The time interval when the code 1 is at zero ohm position correspond to low levels of the output signals of block 2, the lack of operation of the device 4 (Fig.2), the unit state of the trigger 10, the appearance of groups of pulses at the output of the element 9 1-1 and the zero state of the output trigger 11, Thus, the delay in the formation of a code characteristic of the proposed device, it does not exceed part of the period of the alternating voltage of the reading unit, defined by the duration of the output pulse of the form;) ovatel 3 and is reduced at least several times in comparison with the delay of Mirovani code in a known device. Secondly, in view of the elimination of the detector, the conversion accuracy has increased and the degree of difficulty in tuning the device has decreased. Since the moments of momentum of pulses from the outputs of element 6 to device 4 are separated from each other in different bits of the converter on unequal intervals, if it is necessary to increase the noise immunity of the device between the reading unit and the discharge dynamic circuits, it is possible to install drivers with correspondingly different durations mi generated pulses; This makes it possible to reduce the width of the strobes supplied with the driver to dynamic circuits and thereby reduce the likelihood of false alarms. signals. Claim 1. Motion transducer in to containing a code scale connected to the input of a reading unit, a code generation unit containing threshold bits, which are also distinguished by the fact that, in order to improve the performance of the converter, bit cells are entered into the code generation unit and formers according to the number of bits, the differentiating elements and the output trigger, the first output of the reading block is connected to the input of a different threshold device, the output of which is connected, to the first input of the discharge cell and,: output of the reading unit. Through the driver, it is connected to the inputs of the differentiating elements and the second input of the discharge cell, the output of the first differentiating element is connected to the third input of the discharge cell, the output of the second differentiating element is connected to the fourth input of the discharge cell, the first output of the bit the cells are connected to the first input of the upstream trigger, the second output is connected to the second input of the trigger trigger, 2. The converter according to It. It means that the discharge cell is made on the elements AND and the third slot, the first and second inputs of the discharge cell are connected respectively to the first and second inputs of the first element AND, the output of which is connected to the first input trigger and the first output of the bit cell, the third input of the bit cell is connected to the second input of the trigger, the output of which is connected to the first input of the second element And, the fourth input of the bit cell is connected to the second input of the second element And, the output of which is connected to the second output house raf one cell. Sources of information taken into account in examination 1, French Patent No. 2084295, cl. QD8 C 9/00, 1972, 2, USSR Author's Certificate No. 344958, class, Q08 C 9/04,26,03,71 (prototype), P WB / HZ 714454