Real image type variable power finder

Details Real image type variable power finder Real image type variable power finder

1995-02-03

1996-04-30

Nguyen, Thong Q.

Optical: systems and elements

Lens

With variable magnification

359422, 359432, 359676, G02B 1514, G02B 2300

Patent

active

055130437

ABSTRACT:
A real image type variable power finder includes an objective lens system, an ocular lens system, a condenser lens, and an image erecting optical system. The objective lens system includes a first lens group having a negative power and a second lens group having a positive power in this order from the object side, so that the two lens groups being removed to vary the magnification. The second lens group has a negative lens and a positive lens in this order from the object side. The variable power finder satisfies the relationships:

REFERENCES:
patent: 4018511 (1977-04-01), Takahashi
patent: 4240700 (1980-12-01), Ogawa et al.
patent: 5052787 (1991-10-01), Sugawara
patent: 5086353 (1992-02-01), Mulcai et al.
patent: 5231534 (1993-07-01), Kato
patent: 5235460 (1993-08-01), Abe
patent: 5309286 (1994-05-01), Abe et al.
patent: 5323264 (1994-06-01), Kato

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