Auto-focus movie camera

Optics: motion pictures – Removable film strip magazine type

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

352140, 318563, 318601, 318624, G03B 310

Patent

active

042945313

ABSTRACT:
The lens mount of a movie camera is automatically positioned to maintain an image of a subject in focus on a focal plane of a recording station by generating periodic range pulses having a characteristic directly related to subject range, and converting each pulse to a number which represents the focus position of the lens mount. Such number is stored in a first register whose contents vary in response to changes in subject distance at a rate dependent on the pulse repetition rate of the range pulses. The actual position of the lens mount is determined in the form of a second number which is stored in a second register whose contents vary in response to changes in the position of the lens mount at a rate determined by the rate of change of position. Rotation of a reversible motor is initiated when the contents of the registers are unequal, rotation being terminated when the contents are equal. The direction of rotation is in accordance with which of the two registers has the larger contents. Alternatively, rotation is initiated only after it is determined that the contents of one register exceeds the other over a majority of a predetermined number of range pulses, the direction of rotation being determined by which of the two registers has the larger contents a majority of the time over such predetermined number of range pulses.

REFERENCES:
patent: 3522764 (1970-08-01), Biber et al.
patent: 3522981 (1970-08-01), Kirstein et al.
patent: 3650615 (1972-03-01), Aoki et al.
patent: 3752969 (1973-08-01), Kiffmeyer et al.
patent: 3871756 (1975-03-01), Steiringer et al.
patent: 4103309 (1978-07-01), Massa

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Auto-focus movie camera does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

     

Profile ID: LFUS-PAI-O-928295

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.