Television – Camera – system and detail – Optics
Patent
1993-12-21
1995-03-14
Razavi, Michael T.
Television
Camera, system and detail
Optics
348358, 359690, H04N 5232
Patent
active
053980646
ABSTRACT:
A camera system including an objective lens system and a camera body comprises: a movable lens unit included in the objective lens system to act as a variator for varying a focal length of whole of the objective lens system; a CCD for receiving light passed through the objective lens system to pick up an image formed by the objective lens system; a motor for shifting the CCD along the optical axis of the objective lens system; a first detector for detecting a position of an image formed by the objective lens system to produce a defocus signal representing the position of the image; a second detector for detecting a position of the movable lens unit along the optical axis to produce a lens position signal representing the detected position of the movable lens unit; and a controller for controlling the motor in accordance with both of the defocus signal and the lens position signal to bring the light receiver to the position of the image formed by the objective lens system. According to the above feature, a camera system is realized where a varifocal lens system has a satisfactorily small total length and weight because the shifting CCD serves the function of a compensator lens, and the lens system can be driven at a sufficiently high speed for an AF operation with a video camera, etc.
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Greening Wendy R.
Minolta Co. , Ltd.
Razavi Michael T.
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