Projection lens system

Details Projection lens system Projection lens system

1985-03-03

1988-04-26

Corbin, John K.

350449, 350469, G02B 934, G02B 960

Patent

active

047400676

ABSTRACT:
There is disclosed a projection lens system for use in microfilm readers or reader-printers having an image rotation prism adjacent to the screen side of the system. The projection lens system comprises an aperture stop disposed at the screen side of the system and first to fourth lens units arranged in this order toward the film side. The first lens unit is convergent in its entirety and consists of positive and negative lens elements cemented together. The second lens unit consists of a negative meniscus lens element convex on the screen side. The third lens unit is convex both on the screen side and on the film side, and the film side surface has a larger curvature than the screen side surface. The fourth lens unit is divergent in its entirety and has a convex surface on the screen side and a concave surface on the film side.

REFERENCES:
patent: 2424827 (1947-07-01), Kaprelian
patent: 3482901 (1969-12-01), Melech
patent: 3536381 (1970-10-01), Pituley
patent: 3907418 (1975-09-01), Okuyama
patent: 4093348 (1978-06-01), Yasukuni
patent: 4376570 (1983-03-01), Sussman

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-816570