CRT display unit

Details CRT display unit CRT display unit

1985-08-16

1987-08-04

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358150, 358158, H04N 504

Patent

active

046849874

ABSTRACT:
A CRT display unit comprises a line mode detecting circuit (17) for determining a standard mode or a high-resolution mode dependent on the output of a counter (179) counting a horizontal synchronizing signal. When the high-resolution mode is determined, a switching circuit (18) enables a horizontal oscillator (13) and a horizontal deflecting circuit (14) to operate corresponding to the high-resolution mode. In other words, the switching circuit (18) selects time constants (R2 and C1) so as to increase a horizontal oscillating frequency of the horizontal oscillator (13). To a collector of a horizontal deflecting transistor (Q3), two capacitors (C3 and C4) are connected so that a horizontal flyback period may be shortened. An end of a horizontal deflecting coil (28) is connected to a step-down transformer (27) so as to increase a horizontal amplitude. Thus, the horizontal oscillating frequency, the horizontal amplitude and the horizontal flyback period can be automatically set according to each mode.

REFERENCES:
patent: 4246609 (1981-01-01), Van Der Valk
patent: 4316219 (1982-02-01), Smith et al.
patent: 4414571 (1983-11-01), Kurcha et al.
patent: 4616260 (1986-10-01), Erwin et al.

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