Automatic focusing system for use with a motion picture camera

Details Automatic focusing system for use with a motion picture camera Automatic focusing system for use with a motion picture camera

1991-06-25

1992-03-03

Hayes, Monroe H.

Optics: motion pictures

With focus control

354400, 354403, G03B 300

Patent

active

050926705

ABSTRACT:
An automatic focusing system has an automatic parallax correction for use with a camera, which is either a motion picture camera or a video camera. The camera includes a variable focus lens and an adjusting mechanism of a lens focus barrel which adjusts the variable focus lens so that an image of a photographic subject is in focus on a focal plane. A pan/tilt head is mounted on a tripod. The automatic focusing system includes a plate, a motorized turntable, a housing and a range finder. The plate is mounted on the pan/tilt head. The camera is mounted on the plate. The motorized turntable is also mounted on the plate. The motorized turntable is servo controlled. The motorized turntable is disposed a fixed and known first distance from the camera and is made to rotate along an axis parallel to the pan-axis of the pan/tilt head. The housing is mounted on the motorized turntable. The range finder is disposed in and mechanically coupled to the housing. The range finder determines a second distance to the photographic subject from the housing.

REFERENCES:
patent: 4156563 (1979-05-01), Kato et al.
patent: 4239356 (1980-12-01), Freudenschuss et al.
patent: 4534629 (1985-08-01), Bogle et al.
patent: 4601557 (1986-07-01), Bogle et al.
patent: 4876565 (1989-10-01), Tusting
patent: 4935613 (1990-06-01), Ishiguro et al.

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