Viewfinder optical system and optical apparatus having the same

Details Viewfinder optical system and optical apparatus having the same Viewfinder optical system and optical apparatus having the same

1998-12-22

2000-11-07

Sugarman, Scott J.

Optical: systems and elements

Lens

With reflecting element

359569, 359570, 396385, G02B 1700, G02B 518, G03B 1308

Patent

active

061445029

ABSTRACT:
A viewfinder optical system includes an image inverting optical unit for inverting an image formed by an objective optical unit, the image inverting optical unit inverting the image by using a reflecting action of light, and an eyepiece optical unit on which light from the image inverting optical unit is made incident, wherein the viewfinder optical system has a diffractive optical surface.

REFERENCES:
patent: 4027327 (1977-05-01), Harada
patent: 4774401 (1988-09-01), Yamada et al.
patent: 4855780 (1989-08-01), Hayakawa
patent: 4870443 (1989-09-01), Hayakawa
patent: 5119124 (1992-06-01), Ito et al.
patent: 5446588 (1995-08-01), Missig et al.
patent: 5742262 (1998-04-01), Tabata et al.
patent: 5898525 (1999-04-01), Suzuki

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