Real-image finder optical system and apparatus using the same

Details Real-image finder optical system and apparatus using the same Real-image finder optical system and apparatus using the same

1999-02-25

2000-06-20

Mack, Ricky

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

396379, 396386, G02B 2714, G03B 1310, G03B 1308

Patent

active

060784113

ABSTRACT:
A real-image finder optical system having an objective optical system, an image-inverting optical system, and an ocular optical system, wherein a power is given to a reflecting surface of the image-inverting optical system that is closer to the observer side than an intermediate image, thereby achieving an increase in the finder magnification. The objective optical system has a plurality of lens units. When zooming from the wide-angle end to the telephoto end is performed, the spacing between the plurality of lens units is changed. The image-inverting optical system has a plurality of reflecting surfaces. Of the reflecting surfaces, at least one reflecting surface closer to the ocular optical system than the object image is formed from a curved reflecting surface that gives a power to a light beam. The image-inverting optical system has a rotationally asymmetric surface that corrects rotationally asymmetric decentration aberrations produced by the curved reflecting surface.

REFERENCES:
patent: 5963376 (1999-10-01), Togino

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