SU761977A1 - Electrostatic recording apparatus - Google Patents

Description

one

A device for electrostatic recording is known comprising a control unit connected to a modulator unit, the outputs of which are connected to one input of an electrostatic recording unit, and a node 5 for generating high-voltage signals connected to other inputs of an electrostatic recording unit [1].

A disadvantage of the known device is the low recording quality. Yu

The purpose of the invention is to improve the quality of the recording.

This goal is achieved by the fact that the proposed device has a block of matching transformers, with 15 outputs of the block of modulators through a block of matching transformers also connected to one of the inputs of the high-voltage signal generating unit.

FIG. 1 shows a block diagram 20 of the described device; in fig. 2 - diagrams explaining the operation of the device; in fig.

3 - voltage plots with incorrect (a) and correct (b) installation of the sequence of pulses of a high-frequency generator of 25 pulses,

where and is the output voltage of the control unit;

- output voltage of modulators; thirty

2

and ₃ is the output voltage of the high-frequency pulse generator;

- output ‘voltage source of high voltage;

and ₆ — output voltage of high-voltage pulse formers;

and·; - output voltage at the outputs of matching transformers;

and _ъ is the output voltage at the outputs of high-voltage switches.

The device contains a control unit 1, a modulator unit 2, a generator of 3 high-frequency pulses, a high-voltage source 4, an electrostatic recording unit 5 and high-voltage pulse shapers 6, each of which has a matching transformer 7 and high-voltage switches 8.

The control unit has a control unit 1 and a generator of 3 high-frequency pulses. The node generating high-voltage signals contains a source of high-voltage, drivers 6 high-voltage pulses and high-voltage switches 8. The block of matching transformers consists of matching transformers 7.

A device modulator can be a circuit that allows a module to be implemented. ".- .., _.

761977 ’

one signal to another. Such a scheme can be, for example, an AND matching circuit, to one input of which a signal from control unit 1 is fed (see FIG. 1), to another input — to a signal of a high-frequency generator 3, and the output of the AND circuit is connected to the input of matching transformer 7.

After switching on the device, the generator of 3 high-frequency pulses starts to operate in a continuous mode, the repetition period of which should be no more than double the time of switching off the high-voltage switches 8. The output signals of the control unit 1 are fed to the inputs of the high-voltage pulse former 6, resulting in high-voltage outputs pulses, recording of information. After recording the signals from the control unit 1 is not received and, accordingly, there are also no signals at the output of the high-voltage switches 8.

The output signals / control unit 1 are fed to the first inputs of the modulators 2. The second inputs of the modulators 2 receive a signal and ₃ generators of 3 high-frequency pulses. The output signals of the P ₂ modulators 2 are fed to the matching transformers 7, through which are fed to the input of the high-voltage switches 8, as a result of which at their outputs are pulses and ₃ , and _a , which are fed to the recording electrodes of the electrostatic recording unit 5, thereby recording information on the carrier.

When an overestimated repetition period of the generators of the 3 high-frequency pulses is set, the operation of the device is similar to that described above with the only difference that the output pulses P ₆ , P ₈ have “slots”, which reduces the recording quality.

In the device, matching transformers 7 are intended for transmission short. It is well known that the smaller the duration of the transmitted pulse, the smaller the inductance of the transformers and, accordingly, their dimensions. Therefore, the invention leads to a significant reduction in the dimensions of the device as a whole. In addition, in the device, the duration of high-voltage pulses generated by the formers 6 and supplied to the electrodes of the electrostatic recording unit 5 can practically be arbitrarily large, which ensures high-quality recording, for example, on ESB-6 electrostatic paper.

If the period is not set correctly

the sequence of the pulses of the generator 3, the pulses supplied to the electrodes of the electrostatic recording unit 5, have undesirable "slots".

The proposed device improves the quality of the recording.

Claims (1)

Claim A device for electrostatic recording, containing a control unit connected to a modulator unit, the outputs of which are connected to one input of an electrostatic recording unit, and a high-voltage signal formation node connected to other inputs of an electrostatic recording unit, characterized in that has a block of matching transformers, while the outputs of the block of modulators through the block of matching transformers are also connected to one of the inputs of the high-voltage signal generation unit .