Range finding automatic focusing system employing a rotatable tr

Details Range finding automatic focusing system employing a rotatable tr Range finding automatic focusing system employing a rotatable tr

1986-05-01

1988-04-26

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354403, G01J 120

Patent

active

047406763

ABSTRACT:
An automatic focusing apparatus comprises a light emitting element emitting a beam of electromagnetic radiation directed toward a subject through a light projecting lens, a light receiving element receiving a beam spot reflected from the subject and passing through a light receiving lens, and a parallel-surface transparent plate disposed rotatably between the light receiving lens and the light receiving element. The parallel-surface transparent plate is rotated in interlocking relation with linear movement of an optical lens moving together with movement of a focus ring, thereby automatically attaining the focus by ceasing the movement of the lens optical system as soon as the output signal of the light receiving element attains a predetermined level.

REFERENCES:
patent: 3435744 (1969-04-01), Stimson
patent: 3442193 (1969-05-01), Pagel
patent: 3443502 (1969-05-01), Harvey
patent: 3622797 (1971-11-01), Bragg
patent: 4123650 (1978-10-01), Hosoe et al.
patent: 4355904 (1982-10-01), Balasubramanian
patent: 4383168 (1983-05-01), Luck, Jr.
patent: 4445029 (1984-04-01), Nagaoka et al.
patent: 4459004 (1984-07-01), Morizumi

Affiliated with

Also associated with

Rating

Range finding automatic focusing system employing a rotatable tr 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 finding automatic focusing system employing a rotatable tr, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Range finding automatic focusing system employing a rotatable tr will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-821388