Television – Camera – system and detail – Optics
Patent
1995-01-23
1997-05-27
Faile, Andrew
Television
Camera, system and detail
Optics
348375, H04N 5225
Patent
active
056336802
ABSTRACT:
A focus control device of the type including a first sensor circuit arranged to detect the degree of manipulation of a focus operating circuit to produce a lens displacement command signal, a second sensor circuit arranged to detect the current position of a focusing lens to produce a signal indicative of a current lens position, and a comparator arranged to compare the output signals of the first and second sensor circuit to produce a servo control signal according to a difference between the two sensor signals thereby to control the operation of the focusing lens, characterized in that the focus control device comprises an output signal characteristics converting circuit adapted to convert the characteristics of the servo control signal into compliance with a characteristics curve varying with high- and low-pitch inclinations toward the nearest subject distance and infinite ends of the focusing range, respectively.
REFERENCES:
patent: 3522981 (1970-08-01), Kirstein et al.
patent: 4567526 (1986-01-01), Tsuchiya
patent: 4825237 (1989-04-01), Hatase et al.
patent: 4973215 (1990-11-01), Kitamura et al.
patent: 5067802 (1991-11-01), Orino
Kaneko Keiji
Kato Hiroshi
Kawamura Hiroyuki
Yajima Shinya
Faile Andrew
Fuji Photo Optical Co., Ltd.
Ho Tuan V.
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