Variable magnification viewfinder optical system with variable m

Details Variable magnification viewfinder optical system with variable m Variable magnification viewfinder optical system with variable m

1990-07-09

1991-10-01

Henry, Jon W.

Optical: systems and elements

Compound lens system

Telescope

359 93, 359 94, 359319, 359494, 359497, 359642, 359666, G02B 2314, G02B 1500, G02B 102, G02F 113

Patent

active

050527916

ABSTRACT:
The variable magnification viewfinder optical system comprises a polarizing element allowing the light incident thereon to emerge as a linearly polarized light, an objective optical system comprising a first lens component having refractive power variable dependently on the oscillating direction of the incident light, an eyepiece optical system comprising a second lens component having variable refractive power and a switching device capable of changing the oscillating direction of said polarizing element from one to another perpendicular to each other. This viewfinder optical system is capable of easily attaining to design performance thereof such as magnification, dioptric power, field ratio and image legibility, and permits simplifying composition thereof and lowering manufacturing cost therefor.

REFERENCES:
patent: 4758070 (1988-07-01), Nishimoto

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