Keplerian variable magnification finder

Details Keplerian variable magnification finder Keplerian variable magnification finder

1996-03-01

1999-07-06

Nguyen, Thong

Optical: systems and elements

Compound lens system

Variable magnification

359422, 359686, G02B 2300, G02B 1514

Patent

active

059204273

ABSTRACT:
A Keplerian variable magnification finder includes an objective system having a positive refracting power, an image erecting system for erecting an intermediate image formed by the objective system, and an eyepiece system having a positive refracting power. The objective system is composed of a first lens unit having a negative refracting power, a second lens unit having a positive refracting power, a third lens unit having a positive refracting power, and a fourth lens unit having a negative refracting power. At least two of these four lens units are moved along the optical axis so that the magnification of the finder is changed.

REFERENCES:
patent: 4906078 (1990-03-01), Inabata et al.
patent: 5144349 (1992-09-01), Kato et al.
patent: 5144480 (1992-09-01), Ohshita
patent: 5231534 (1993-07-01), Kato
patent: 5257129 (1993-10-01), Morooka et al.
patent: 5448400 (1995-09-01), Kikeuchi et al.
patent: 5570229 (1996-10-01), Kanamori
patent: 5587400 (1996-12-01), Takase et al.
patent: 5757543 (1998-05-01), Ogta

Affiliated with

Also associated with

Rating

Keplerian variable magnification finder does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-903604