Camera focus indicator

Details Camera focus indicator Camera focus indicator

1998-06-01

2000-12-12

Adams, Russell

Optics: motion pictures

With focus control

352139, G03B 300

Patent

active

061606073

ABSTRACT:
A focus indicator system for a motion picture camera has video cameras mounted on opposite sides of the motion picture camera. Images produced by the video cameras are superimposed on the screen of a monitor. The video cameras are rotatable, and rotate in responses to changes in the focus of the lens. Movements of the lens' focus ring are detected by a transducer. A control circuit monitors the output from the transducer and operates a motor, which rotates the video cameras in opposite senses. The optical axes of the video cameras cross in the plane in which the lens is focused. The person operating as first assistant camera can determine when the motion picture camera is in focus by viewing the monitor. When an object is in focus, the superimposed images from the video cameras coincide. When the object is not in focus the superimposed images are separated. The focus indicator helps the person who is focussing the camera to rapidly and accurately focus on objects in the camera's field of view. This reduces re-takes caused by inaccurate focusing and makes set up faster. This reduces production costs.

REFERENCES:
patent: 2202593 (1940-05-01), Moreau et al.
patent: 3661064 (1972-05-01), Norris
patent: 3957355 (1976-05-01), Reinsch et al.
patent: 4114994 (1978-09-01), Kondo
patent: 4123765 (1978-10-01), Isono
patent: 4156563 (1979-05-01), Kato et al.
patent: 4290693 (1981-09-01), Stein
patent: 4371240 (1983-02-01), Shimizu et al.
patent: 4534629 (1985-08-01), Bogle et al.
patent: 4591257 (1986-05-01), Sawano
patent: 4601557 (1986-07-01), Bogle et al.
patent: 4692006 (1987-09-01), Rice et al.
patent: 5092670 (1992-03-01), Preston
patent: 5140414 (1992-08-01), Mowry
patent: 5142299 (1992-08-01), Braun
patent: 5142642 (1992-08-01), Sudo
patent: 5175616 (1992-12-01), Milgram et al.
patent: 5453840 (1995-09-01), Parker et al.
patent: 5493638 (1996-02-01), Hooper et al.
patent: 5552823 (1996-09-01), Kageyama
patent: 5636211 (1997-06-01), Newlin et al.
patent: 5682198 (1997-10-01), Katayama et al.
patent: 5798791 (1998-08-01), Katayama et al.
patent: 5801760 (1998-09-01), Uomori
patent: 5949477 (1999-09-01), Hoglin

Affiliated with

Also associated with

Rating

Camera focus indicator does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Camera focus indicator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Camera focus indicator will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-222735