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

1992-08-17

1994-06-21

Sikes, William L.

Optical: systems and elements

Compound lens system

Variable magnification

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

Patent

active

053232640

ABSTRACT:
A real image mode variable magnification finder optical system has an objective lens system including a first lens unit of negative refracting power, a second lens unit of positive refracting power, and a third lens unit of negative refracting power, provided with positive refracting power as a whole; and image erecting system for erecting an image of an object; and an eyepiece system for observing the erected image, in which the first and second lens units are moved and the third lens unit is fixed to vary magnification. Thus, the finder optical system has important advantages in practical use that its overall length is reduced, aberrations are favorably corrected, and manufacturing costs are low.

REFERENCES:
patent: 4757336 (1988-07-01), Nakayama et al.
patent: 4779969 (1988-10-01), Sato et al.
patent: 4812023 (1989-03-01), Kikuchi
patent: 4842395 (1989-06-01), Sato et al.
patent: 4854680 (1989-08-01), Kikuchi
patent: 5231534 (1993-07-01), Kato

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