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

1990-01-17

1991-12-31

Adams, Russell E.

Optics: motion pictures

With focus control

354402, 354403, G03B 1336

Patent

active

050766864

ABSTRACT:
A motion picture camera is used with an automatic focusing system. The motion picture camera is mounted on a first tripod and includes a variable focus lens and an adjusting mechanism for adjusting the variable focus lens so that an image of a photographic subject is in focus on the focal plane. The automatic focusing system includes a housing, a range-finding subsystem, an angle-encoding subsystem, a processing subsystem and a driving assembly which is mechanically coupled to the adjusting mechanism. The housing is mounted on a second tripod and is disposed apart from the motion picture camera a first distance and from the photographic subject a second distance. The range-finding subsystem and the angle-encoding subsystem are disposed within and mechanically coupled to the housing. The range-finding subsystem determines the first distance along a first line and the second distance along a second line and provides a first signal and a second signal which are proportional to the first and second distances, respectively. The angle-encoding subsystem measures the angle by which the first and second lines diverge from each other and provides a third signal which is proportional to the angle. The processing subsystem processes the first, second and third signals to determine a third distance between the motion picture camera and the photographic subject and then generates an output signal which correlates to the third distance. The driving assembly drives the adjusting mechanism in response to the output signal.

REFERENCES:
patent: 4032934 (1977-06-01), Hendrickson 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.

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