Zoom lens system

Details Zoom lens system Zoom lens system

1990-07-06

1992-05-12

Perkey, W. B.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

3541951, 358227, G03B 500, G03B 1336, H04N 5232

Patent

active

051132141

ABSTRACT:
A zoom lens system in which an angle of view is automatically varied according to camera-to-subject distances so as to be able to provide on a photographing screen a subject which is always constant in size. In the zoom lens system, a focus lens is stopped at a given position and, in this condition, a magnification varying lens and a compensator lens are driven to thereby achieve a focusing operation. In this operation, the angle of view is automatically varied according to the camera-to-subject distances, so that the size of the subject can be always constant with respect to the photographing screen regardless of the camera-to-subject distances. As a result of this, according to the invention, there is eliminated the need for provision of a data table memory for performing an automatic zooming operation, and exclusive and complicated control device and position detection device.

REFERENCES:
patent: 4083057 (1978-04-01), Quinn
patent: 4145732 (1979-03-01), Pandres, Jr.
patent: 4156933 (1979-05-01), Pandres, Jr.
patent: 4825237 (1989-04-01), Hatase et al.
patent: 4942417 (1990-07-01), Miyazawa et al.
patent: 4951075 (1990-08-01), Tokumaru et al.
patent: 4962400 (1990-10-01), Otani et al.
patent: 5027147 (1991-06-01), Kaneda

Affiliated with

Also associated with

Rating

Zoom lens system does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2427057