Variable magnification viewfinder

Details Variable magnification viewfinder Variable magnification viewfinder

1996-02-21

2000-04-18

Nguyen, Thong

Optical: systems and elements

Compound lens system

Variable magnification

359431, 359689, G03B 1306, G02B 1514

Patent

active

060522259

ABSTRACT:
In a variable magnification viewfinder of real image type in which an object image formed by an objective lens system of positive refractive power is converted into an erecting image by an image inverting optical system and the erecting image is observed through an eyepiece lens system, the objective lens system includes, in order from the object side, a negative first lens unit, a negative second lens unit and a positive third lens unit, and, during variation of magnification from the lowest magnification side to the highest magnification side, both the second lens unit and the third lens unit move toward the object side monotonically, so that a good optical performance throughout the entire range of variation of magnification can be attained.

REFERENCES:
patent: 4842395 (1989-06-01), Sato et al.
patent: 5173806 (1992-12-01), Ogata
patent: 5300977 (1994-04-01), Lewis et al.
patent: 5323264 (1994-06-01), Kato
patent: 5410430 (1995-04-01), Ito et al.
patent: 5504626 (1996-04-01), Oshikiri
patent: 5555431 (1996-09-01), Kim

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2340897