Variable focal length lens system

Details Variable focal length lens system Variable focal length lens system

1984-09-06

1987-10-20

Corbin, John K.

350423, G02B 1515

Patent

active

047010339

ABSTRACT:
A variable focal length lens system wherein the system comprises a first lens unit of a positive refractive power, a second lens unit of a negative refractive power with a first variable air space formed between the first and second lens units, a third lens unit of a positive refractive power, and a fourth lens unit of a negative refractive power with a second variable air space formed between the third lens unit and fourth lens unit. The back focal length of the whole lens system for the shortest focal length is less than half of the diagonal length of the image plane. The first lens unit is shiftable from the image side to the object side while increasing the first variable air space in the zooming operation from the shortest focal length to the longest focal length. The fourth lens unit is shiftable from the image side to the object side while decreasing the second variable air space in the zooming operation from the shortest focal length to the longest focal length.

REFERENCES:
patent: 4256381 (1981-03-01), Kreitzer
patent: 4494828 (1985-01-01), Masumoto et al.

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1609374