Television – Camera – system and detail – Optics
Patent
1993-04-23
1995-03-28
Groody, James J.
Television
Camera, system and detail
Optics
348345, 348351, 354402, 35419512, H04N 5232, H04N 5225
Patent
active
054021740
ABSTRACT:
In a camera system including a camera unit and a lens unit which is detachably mounted on the camera unit, an automatic focusing apparatus comprises a focus signal forming circuit which forms a focus detection signal for indicating a focusing state of the lens unit, a focal length information outputting circuit which produces absolute focal length information on the absolute focal length of the lens unit, a transmission circuit which transmits the absolute focal length information to the camera unit, and a control circuit which controls the focus signal forming circuit on the basis of the absolute focal length information.
REFERENCES:
patent: 4404595 (1983-09-01), Ushiro et al.
patent: 4851897 (1989-07-01), Inuma et al.
patent: 4857951 (1989-08-01), Nakajima et al.
patent: 4924317 (1990-05-01), Hirao et al.
patent: 4967281 (1990-10-01), Takada
Canon Kabushiki Kaisha
Groody James J.
Metjahic Safet
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