Real image mode variable magnification finder optical system

Details Real image mode variable magnification finder optical system Real image mode variable magnification finder optical system

1992-01-16

1993-07-27

Henry, Jon W.

Optical: systems and elements

Compound lens system

Variable magnification

359431, 359689, 354222, 354225, G02B 15177, G02B 2314, G02B 2302, G03B 1312

Patent

active

052315347

ABSTRACT:
A real image mode variable magnification finder optical system includes an objective lens system having a positive refractive power as a whole, an image erecting system for erecting an intermediate image formed by the objective lens system, and an eyepiece system having a positive refracting power as a whole, in which the entrance surface of the image erecting system has a negative refracting power and an intermediate image is formed between the entrance surface of the image erecting system and the eyepiece system. Thus, the real image mode variable magnification finder optical system, although it is such an optical system that an erect image is obtained by a Porro prism system constructed of a plurality of reflecting members, has important advantages in practical use that a finder length is reduced, optical performance is favorable, design is compact, and finder magnification is high.

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patent: 5061054 (1991-10-01), Ohshita
patent: 5095326 (1992-03-01), Nozaki et al.
patent: 5144349 (1992-09-01), Kato et al.

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