Real-image finder optical system

Details Real-image finder optical system Real-image finder optical system

1999-07-19

2000-06-13

Nguyen, Thong

Optical: systems and elements

Compound lens system

Telescope

359362, 396386, G03B 1306, G03B 1302

Patent

active

060756454

ABSTRACT:
A real-image finder optical system is provided with an information display element located between an image plane of an objective optical system and a moving lens group of the objective optical system, and a partial mirror surface provided on an object side with respect to the information display element. The finder optical system includes the objective optical system having a positive power, an erecting optical system for erecting a reversed real image formed by the objective optical system, and an eyepiece optical system for observing the real image. Magnification of the finder optical system varies with the movement of at least one moving lens group of the objective lens system in a direction of an optical axis.

REFERENCES:
patent: 4429978 (1984-02-01), Ikari
patent: 5400101 (1995-03-01), Yoneyama et al.
patent: 5475458 (1995-12-01), Arai
patent: 5739956 (1998-04-01), Ohtake
patent: 5752107 (1998-05-01), Hasushita et al.

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