Compact wide-angle variable focal length lens system

Details Compact wide-angle variable focal length lens system Compact wide-angle variable focal length lens system

1994-03-08

1996-10-29

Nelms, David C.

Optical: systems and elements

Lens

With variable magnification

359689, 359780, 359784, G02B 1514

Patent

active

055702341

ABSTRACT:
A wide-angle variable focal length lens system comprising a first lens unit which is to be kept stationary for varying a focal length of the variable focal lens system and composed of a single positive lens component, a second lens unit which comprises at least one positive lens component and has a negative refractive power as a whole, a stop, and a third lens unit having a positive refractive power; and configured so as to perform variation of a focal length of the lens system and adjustment of an image location by moving the second lens unit and the third lens unit along an optical axis in directions which are opposite to each other. This variable focal length lens system has a field angle of 64.degree. to 74.degree. at a wide position thereof, a variable focal length ratio of 3 to 3.3 and an F number on the order of 2, and comprises a small number of lens components.

REFERENCES:
patent: 4721371 (1988-01-01), Imai
patent: 4854683 (1989-08-01), Ozawa
patent: 4991942 (1991-02-01), Fujibayashi et al.
patent: 5260834 (1993-11-01), Shibata et al.

Affiliated with

Also associated with

Rating

Compact wide-angle variable focal length 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 Compact wide-angle variable focal length lens system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Compact wide-angle variable focal length lens system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1789857