Finder optical system

Details Finder optical system Finder optical system

1991-04-04

1993-02-02

Sugarman, Scott J.

Optical: systems and elements

Lens

Including a nonspherical surface

354219, 359716, 359774, 359792, G02B 1318, G02B 1302, G02B 912, G02B 934

Patent

active

051842521

ABSTRACT:
A finder optical system including an objective having a positive refractive power, an image erecting optical member for erecting an image formed by the objective, and an eyepiece for allowing observation of the image formed by the objective and erected by the image erecting optical member. The objective consists of a first positive lens component and a second negative lens component, or a single lens having a convex surface on the object side. This finder optical system has a simple composition, a compact external design and a relatively wide field angle.

REFERENCES:
patent: 4751539 (1988-05-01), Yamada et al.
patent: 4926201 (1990-05-01), Mukai et al.

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