Image pickup apparatus

Details Image pickup apparatus Image pickup apparatus

1992-04-29

1994-03-29

Perkey, W. B.

Optical: systems and elements

Prism

With reflecting surface

3541951, 359698, 348357, G03B 500, G03B 1336, G02B 710

Patent

active

052989330

ABSTRACT:
A video camera comprises: a stepping motor to drive a photographing lens; a stepping motor driving circuit; and a control circuit to control the stepping motor driving circuit in correspondence to the position of the photographing lens. When the driving of the photographing lens is started, the control circuit sets a stepping motor driving frequency in correspondence to the position of the photographing lens. When the set frequency is equal to or higher than a predetermined frequency, the stepping motor driving circuit is controlled and a rectangular waveform output of a large duty ratio is supplied to the stepping motor for a predetermined period of time from the actuation of the stepping motor. After the elapse of the predetermined time, an almost smooth waveform output of the set frequency corresponding to the position of the photographing lens is supplied to the stepping motor.

REFERENCES:
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patent: 4772909 (1988-09-01), Ogasawara
patent: 4920420 (1990-04-01), Sano et al.
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patent: 5028945 (1991-07-01), Kashihara et al.
patent: 5157432 (1992-10-01), Fukuoka et al.
patent: 5164756 (1992-11-01), Hirasawa
patent: 5172149 (1992-12-01), Sekiguchi et al.
patent: 5185669 (1993-02-01), Kato
patent: 5200860 (1993-04-01), Hirasawa et al.
patent: 5223981 (1993-06-01), Kaneda

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