Optics: motion pictures – Removable film strip magazine type
Patent
1979-02-08
1981-08-18
Gellner, Michael L.
Optics: motion pictures
Removable film strip magazine type
352140, 354 31, G03B 310
Patent
active
042838630
ABSTRACT:
A camera with a focusable objective including an axially shiftable lens member has two ancillary projection systems continuously or intermittently intercepting incident light rays downstream of that lens member and deflecting them onto respective inputs of a photoelectric comparator which emits a coincidence signal whenever these light rays project substantially identical images of an object to be photographed or filmed. One of the projection systems may include a periodically movable element which varies the relative orientation of the two beams constituted by the deflected light rays so that different angles of incidence give rise to a coincidence signal in different parts of a sweep cycle; in one position of this element, in which the incident rays will have a predetermined orientation (e.g. parallel to the objective axis) with proper focusing, a position sensor generates a correlation signal. A phase detector receiving the coincidence and correlation signals may control a drive motor for the shiftable lens member or may simply indicate to the user the required adjustment. The movable element may be a swingable mirror in the path of a deflector beam or, in the case of a cine camera, a peripheral zone of a rotary shutter reflecting the incident rays between exposures. In the absence of such a movable element, the coincidence signal will appear only when the incident light rays originate at an object point lying substantially in a plane conjugate to the film or other receiving surface.
REFERENCES:
patent: 4019049 (1977-04-01), Schulz
patent: 4085320 (1978-04-01), Wilwerding
patent: 4097881 (1978-06-01), Katagiri
patent: 4160587 (1979-07-01), Heiniger et al.
Heiniger Wilfred
Kreienbuhl Claude
Millan Manuel
Bolex International SA
Gellner Michael L.
LandOfFree
Range finder for focusable photographic or cinematographic camer does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Range finder for focusable photographic or cinematographic camer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Range finder for focusable photographic or cinematographic camer will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-31511