Driving circuit for an electrostatic recording head

Details Driving circuit for an electrostatic recording head Driving circuit for an electrostatic recording head

1983-07-12

1985-10-01

Goldberg, E. A.

Recorders

Electric recording

Electrochemical

307255, 307270, G01D 1506, H03K 1700

Patent

active

045449341

ABSTRACT:
The invention is a driving circuit for an electrostatic recording head which reduces the turn-on time, the storage time and the turn-off time of the driving circuit output pulses. Mutually complementary first and second transistors are connected with their collectors in common. A first driving signal is supplied via a coupling capacitor to the base of the first transistor, and is also supplied to the base of the second transistor. High voltage is supplied to the emitter of the first transistor. The output signal is obtained from the interconnection of the common collectors. The first driving signal has three sequential levels, two of which occur within the time period when the recording picture signals are supplied. The first level e.sub.2 is the highest and occurs during the beginning portion of the recording signal and the second level e.sub.1 is lower than e.sub.2 and occurs during the remaining portion of the recording signal. The third level is the smallest (i.e., zero or ground level (o)) and occurs immediately after e.sub.1 when no recording signals are supplied. A second driving signal is applied to the emitter of the second transistor. The second driving signal has two non-zero sequential levels (i.e., e.sub.4 and e.sub.3). The first level e.sub.4 is the larger of the two and occurs at the end of e.sub.1 and continues for a time approximately equal to or greater than T.sub.c. The second level e.sub.3 occurs immediately after e.sub.4.

REFERENCES:
patent: 3751682 (1973-08-01), Howe

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