Automatic focus control apparatus for a video camera

Details Automatic focus control apparatus for a video camera Automatic focus control apparatus for a video camera

1990-09-04

1992-03-31

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358225, 354402, 310332, H04N 5232

Patent

active

051012782

ABSTRACT:
In an automatic focus control apparatus for a video camera including an image pick-up element for picking up an optical image obtained through a lens system composed of a focus lens group, a zoom lens group, a focal position correction lens group and a relay lens group and a defocus detector for detecting a defocus signal corresponding to a defocus of the lens system from an image signal output from the image pickup element, a piezoelectric actuator is provided to move the image pick-up element in an optical-axis direction in accordance with the defocus signal and a motion transmission mechanism connects the image pick-up element to the relay lens group of the lens system to allow that lens group to be moved in a direction opposite to that in which the image pick-up element is moved. A stroke burden which is borne by the piezoelectric actuator can be alleviated by moving the relay lens group together with the image pick-up element.

REFERENCES:
patent: 3748503 (1973-07-01), Cobarg
patent: 3760203 (1973-09-01), Guntersdorfer
patent: 4160184 (1979-07-01), Ljung
patent: 4558367 (1985-12-01), Urata
patent: 4601539 (1986-07-01), Watanabe
patent: 4748509 (1988-05-01), Otake
patent: 4975726 (1990-12-01), Kuga
Junichi Ishida and Yasuhi Fujimaru TV-Camera Automatic Focusing Control by Hill-Climbing Servo System, Research by NHK Giken vol. 17, No. 1, 1965 pp. 21 to 37.

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