SU1244806A2 - Device for controlling current of writing beam of cathode-ray tube - Google Patents

Description

the recording unit of the reference signals 6, the cathode ray tube (BELT) 7, the pulse selector (SI) 8, the unit for the formation of the reference voltage 9, consisting of three SI 10,11 and 12, three peak detectors (1Ч) 13, 14 and 15 ,. divider 16 and multiplier 17, comparison unit 18, element I 19, three flip-flops 20,22. and 24, digital integrator 21, two counters 23 and 26, switching unit 25, reversing counter 27, executive unit 28 and MSh 29. S, bio synchro 1, f 2,3,4 and 5 and block b of the 1 st and 2 nd eta1

The invention relates to the transmission of images, namely, systems for automatically adjusting the mode of the video signal sensors, can be eliminated in defectoscopy, computing and measuring equipment for automatic adjustment of the recording beam current in memory devices of various types of radiation and is an improvement of the device on auth. K 1 109946.

The invention Gzhel is improving the accuracy of setting the current of the recording beam.

The pa figure 1 shows the structural electrical circuit of the device; FIG. 2 is a structural electrical circuit of a peak detector.

A device for adjusting the beam current of an electron beam beam, the tube contains a synchronizer 1, a former gate 2 shaper, a second gate shaper 3, a first reference signal shaper 4, a second reference signal shaper 5, a reference sigpal unit 6, an electron-7 block 1 tube, pulse selector 8, voltage-generating unit 9 containing the first pulse selector 10, the second pulse selector 11, the third pulse selector 12, the first peak detector 13, the second peak detector 14, the third peak The detector 13, the divider 16 and the multiplier 17, the comparison unit 18, the eleton signals affect the current of the BELT recording beam 7 and its load. 1 adapters arrive at the signal inputs of the SI 8 and 10. At the outputs of the SI 8 and 10, the BELT 7 recording section responds to the 2nd and 1st reference signals, which are detected by SSH 29 and 13, and at the outputs of the SI 11 and 12, 2- The first and the first reference signals pass through all the circuits, except for the BELT 7 recording section, which are detected. Gsch 14 and 15. The goal is achieved by introducing F 2, 3, 4 and 5, Ci 8 and Gsch 29. 29. An example of the execution of Gsch is given. . 2 hp f-ly, 2 ill.

2

ment I 19, first trigger 20, digital integrator 21, second trigger 22, first counter 23, third trigger 1 ep 24, block 25 switch H1, second

counter 26, reversible counter 27, a full unit 28, a peak detector 29, a control signal unit 30, a clock tpt-generator 31, an analog-to-digital converter 32, a unit of coincidence elements 33, a memory register 34, a digital-to-analog converter 35 .

The device works as follows.

At the end of each line, when raster scanning shng at the end of each radius, when radial-circular sweeping, the co-driver 1 generates a pulse that triggers the driver

2 of the first strobe, on the leading edge of which the shaper 4 of the first reference sipgal produces a first reference signal in the form of a pulse with a duration shorter than the first strobe and with a calibrated amplitude. Similarly, the second gate forms by the shaper 3 of the second gate, the second gate at the time it stands after the first gate, and the shaper 5 of the second

reference signal the second reference signal. The amplitudes of the first and second reference signals are calibrated and different from each other. In terms of maximizing the signal / ratio

/ noise at the input of the unit of comparison 18 and maximizing the reliability of the HJ estimation,

the output of the comparison block 18, the ratio of the amplitudes of the reference signals should be chosen to be 1: 2. Through the unit 6 for recording reference signals, the first and second reference signals are fed to the searchlight modulator of the cathode-ray recording and to the signal inputs of selectors II and 12. The first and second reference signals to the searchlight-modulator of the cathode-ray recording are affected. vuyut on the current beam recording. The pulses connected to the signal inputs of the selectors 8 and 10 are removed from the load included in the collector of the recording section of the cathode-ray tube. The selectors 8, 10, 11 and 12 are controlled by the gate pulses from the output. Dov formers 2 and 3 of the first and second gates. Thus, at the output of the selector 8, we get the response of the section of the recording of the cathode ray tube to the second reference signal, which is detected by the peak detector 29. At the output of the selector 10, we obtain a patch of the recording section of the cathode ray tube at the first, long signal which is detected by the peak detector 13. At the outputs of the selectors I1 and 12, we obtain the second and first reference signals, respectively, of the veino that have passed all the circuits except the recording section of the electron-beam tube, which are detected by the peak detectors 14 and 15, respectively.

Peak detectors 29, 13, 14, and 15 are presented in Figure 2 and operate as follows.

When the shaper 2 (or 3) is started, the first (or second) strobe, the control signal unit 30, generates a short setting pulse on the front edge of the strobe, embedding the memory register 34. At the end of the installation, the generator starts 31 clock pulses, clocking the operation of the analog-digital converter 32. The pulse enabling the generator of 31 clock pulses simultaneously allows the passage of signals from the analog output; the digital-to-digital converter 32 through the block 33 elements The match of the 34 memory register is the same. In this case, the amplitude of the signals received at the inputs of the selectors 8, 10, the conversion of iix into a digital farm and the recording of the amplitude values of g.

5 5 0 5 o.

0

34 memory register. At the end of the gates, the memory register 34 stores the value of a minute of signals until the next cycle of operation. From the outputs of register 34 of memory, the stored values of the signals are fed to the inputs of digital-to-analog converters 35, where they are converted into the corresponding voltage levels that carry information about the amplitudes of the pulses received at the inputs of the peak detectors 29, 13, 14 and 15. Perv and second reference signals that have passed All the circuits of the device, preceding the recording section of the cathode ray tube and measured in amplitude, respectively, by the ssp detector 14 and 15, go to the second and first inputs of the divider 16, which determines the exact ratio e the amplitudes of the reference signals received at the input of block 7 of the electron-beam tube. The value characterizing this ratio is fed to the input of the multiplier 17, to the other input of which, from the output of the peak detector 13, the amplitude of the first reference signal passed through the recording section of the cathode ray tube. At the output of the multiplier 17, as a result, we have the response of the recording section of the electron-beam tube to the first reference signal multiplied by the ratio of the second reference signal to the first reference signal. This value is the threshold that arrives at the second input of the comparison unit 18 with which the amplitude-response of the recording section of the electron-beam tube to the second reference signal is compared. Comparison unit 18 evaluates the amplitude at the output of the peak detector 29 with respect to the magnitude of the reference voltage supplied from the multiplier 17. If the voltage amplitude at the output of the detector 29 exceeds the voltage from output of intermittent 17, then the output of the comparison unit 18 the level O is formed, otherwise the level 1 is formed. The signal from the output of the comparator unit 18 is fed to one input of the element I 19, to the other input of which from the first output of the synchronizer 1 a clock pulse is applied to effect sampling, which is necessary to further increase the noise immunity of the device. From the output of the element AND 19, the quarnite signal is fed to the input of the first trigger 20, to the installation input of which a short impt / ls is supplied from the third output of synchronizer 1, which coincides with the end of the second gate. The state of the first flip-flop 20 determines the separate selective attenuation of the signal at the output of the peak detector 29 relative to the voltage from the output of the jumper 17. The signal for evaluating the output of the first flip-flop 20 goes to the control Ygdgp input of the reversible counter 27, to the counting the input of which is supplied by the pulses from the output of the block 25 rooms. The stroke impulses are summed up and subtracted. counter 27 depending on the value of the evaluation signal and the moment of their charging. The code taken from the single points of the reversible counter 27 sends ira the input of the execution unit 28, which converts the control into an analog form. The control signal from the upstream of the executive unit 28 is connected to the controllable input of the unit 7 of the electron beam tube, supporting the equality of the signals Ia to the inputs of the comparison unit 18. The switching unit 25 passes pulses from the fourth spin of the synchronizer 1, jni6o overshoot pulses from the output of the digital integrator 21, depending on the signal level, coming from the output of the third trigger 24 to the control input of the comgut-25 unit 25. If on the output of the third trigger 24 a level 1 signal, then the counting input of the reversible counter 27 receives pulses from the fourth output of the synchronizer 1, which coincide with the falling edge of the second strobe. In this case, the change in the signal at the output of the execution unit 28 is carried out by a separate sampling estimate. In addition, each selective estimate is received from the top 7J, and the nerve trigger 20 to the first input of the digital integrator 21. In this case, the device controls the accuracy of determining the direction of change of the control signal to the optimum value of the signal

integrator 21. For this purpose, pulses exceeding the threshold from the output of the digital integrator 21 are fed to one input of the second trigger 22, to the other input of which an evaluation signal is received from the output of the first trigger 20, wherein a change in the level of the logic signal on the output of the second trigger 22 indicates a change overflow sign of digital integrator 21. A signal from the output of the second trigger 22 is fed to the counting input of the first counter 23, the installation of which receives a reset pulse from the fourth output of the synchronizer 1. The first counter 23 to troliruet intensity change of sign overflow digital integrator 21. -If in- clude overflow mark shifts the digital integrator 21 for resetting the pulse repetition period of the fifth to yield syn- pizatora I exceeds a threshold value, the output of the first counter 23 is formed by the overflow pulse. The occurrence of a non-full pulse indicates that the amplitude of the oscillation-control signal at the output of the executive

block 28 when it reaches the optimal value-1.

 In order to shorten the operating time, the overflow pulse from the output of the first counter 23 is applied to the first input of the third trigger 24, and the O level is set at its output. At the same time, the counter input of the reversing counter 27 passes through the switching unit 25

the threshold is exceeded from the output of the digital integrator 21. The overflow rate is controlled in the device to shorten the operating time.

thresholds of the digital integrator 21. For this, pulses exceeding the threshold of the digital integrator 21 are fed to the counting input of the second counter 26, to the installation input of which a reset pulse is sent from the fifth output of the synchronizer 1. If the number of overflows of the digital integrator 21 occurs during the reset pulse synchronizer 1 exceeds the threshold value, then an overflow pulse is formed at the output of the second counter 26, which sets the output of the third flip-flop 24 to level 1. At the same time, the reverse input to the counting input After the counter 27 is received through the block 25, the pulses from the second output of the synchronizer 1 are reduced; the time for the output of the block 7 of the cathode ray tube to the operating mode is reduced.

Claims (3)

1. A device for adjusting the beam current of recording a cathode ray tube according to auth.St. No. 1109946, characterized in that, in order to improve the accuracy of the recording beam current setting, a shaper of the first strobe, a shaper of the first reference signal, a shaper of the second strobe, a shaper of the second reference signal, a selector number 1 of pulses and a peak detector, and the synchronizer output connected to the first input of the recording unit of the reference signals through the serially connected fornoser 1 of the first gate and the former of the first reference signal, the second input of the recording unit of the reference signals is connected to the second output of the first strobe generator through the serially connected shaper of the second reference signal and the shaper of the second strobe; the output of the electron beam tube is connected to the first input of the comparator unit through successively connected pulse selector and nickel detector, combined second inputs of the pulse selector and peak detector connected to the second output of the former of the second strobe; the first auxiliary input of the reference voltage shaping unit is connected to the output of the electron unit the second auxiliary input with the second output of the first gate generator, and the synchronizer input is the external synchronization signal input. 2 The device according to claim 1, which means that the voltage shaping unit comprises a series-connected first pulse selector, whose input is the first auxiliary input of the voltage shaping unit, the first peak detector and multiplier whose output is The output of the reference voltage generation unit, serially connected to the second pulse selector, second peak detector and divider, the output of which is connected to the second input of the multiplier, and serially connected the third pulse selector and the third peak detector, the output of which is connected to the BTOPF IM divider input, and the combined 20, the first inputs of the second and third pulse selectors are the input of the forcing unit of the reference voltage. neither, the combined second inputs of the first and third pulse selectors, 25 of the first and third peak detectors are the third additional input of the reference voltage generation unit, the second additional input of which is the combined 30 second inputs of the second selector and the second peak detector. . 3. The device according to claim 1, of which is that each peak detector comprises a sequentially connected signal block control, the input of which is the second input of the peak detector, clock generator, analog-to-digital converter, block The 40 match elements, the memory register and the digital-to-analog converter, whose output is the output of the peak detector, while the second output of the control signal block 45 is connected to the control input of the memory register, the second input of the analog-digital converter, and the second input of the block of elements coincident 50 1sh is connected to the first output of the control signal block. Editor M. Tsitkina Compiled by I. Gracianska Tehred O.Gortvay Proofreader V.Sinitska Order 3928/59 Circulation 624 Subscription VNIIPI USSR State Committee for inventions and discoveries 10035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4