Wide angle and variable magnification lens system for finite dis

Details Wide angle and variable magnification lens system for finite dis Wide angle and variable magnification lens system for finite dis

1985-03-29

1987-03-17

Corbin, John K.

G02B 1500, G02B 964

Patent

active

046502955

ABSTRACT:
The wide angle and variable magnification lens system for finite distance consists of a first lens group whose focal length is negative as a whole, a second lens group whole focal length is positive as a whole, an aperture stop, a third lens group whose focal length is positive as a whole and a fourth lens group whose focal length is negative as a whole arranged in the named order from the object side and symmetrically relative to said aperture stop. The focal length of the total lens system is variable by changing the spacing between the first and the second lens groups and the spacing between the third and fourth lens groups by approximately the same amount. The first lens group comprises, in the order from the object side, a first component of a negative meniscus lens with its concave surface facing to the aperture stop, a second component of a negative lens and a third component of a positive meniscus lens with its convex surface facing toward the object side, and the fourth lens group comprises, in the order from the image side, a tenth component of a negative meniscus lens with its concave surface facing to the aperture stop, a ninth component of a negative lens and an eighth component of a positive meniscus lens with its convex surface facing toward the image side.

REFERENCES:
patent: 3973831 (1976-08-01), Minoura
patent: 4037937 (1977-07-01), Minoura

Affiliated with

Also associated with

Rating

Wide angle and variable magnification lens system for finite dis does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Wide angle and variable magnification lens system for finite dis, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Wide angle and variable magnification lens system for finite dis will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1784946