Focusing device

Details Focusing device Focusing device

1979-08-20

1981-03-10

Griffin, Donald A.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250201, G01J 136, G03B 310

Patent

active

042550297

ABSTRACT:
A focusing device for the focusing movement of at least one member of an objective lens, with at least one photoelectric transducer or sensing device which is arranged on the axis of an optical system, by which transducer device in dependency on the contrast of the scene to be photographed which is illuminated by the ambient light a signal is able to be produced (passive range finding) and with an evaluation device for the signal which is produced by the photoelectric transducer device, by which device a special evaluation signal is able to be produced during insufficient contrast of the object to be photographed. By this special evaluation signal, a transmitting device for emitting an (active) distance measuring wave packet on the object to be photographed can be turned on by means of a switching device.

REFERENCES:
patent: 3435744 (1969-04-01), Stimson
patent: 3471863 (1969-10-01), Harrison et al.
patent: 3529528 (1970-09-01), Leitz
patent: 3653762 (1972-04-01), Harvey
patent: 3813679 (1974-05-01), Hasegawa et al.
patent: 4080531 (1978-03-01), Stauffer
patent: 4153834 (1979-05-01), Hayamizu

Affiliated with

Also associated with

Rating

Focusing device does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1291448