Relay variable power optical system and a microscope equipped wi

Details Relay variable power optical system and a microscope equipped wi Relay variable power optical system and a microscope equipped wi

1998-01-20

1999-09-28

Nguyen, Thong

Optical: systems and elements

Compound lens system

With relay

359435, G02B 2106, G02B 2300

Patent

active

059597720

ABSTRACT:
The present invention provides a relay variable power optical system in a simple structure which is capable of suppressing a change of the position of the exit pupil on varying the power. To this end, the relay variable power optical system is provided with a front lens group G0 for condensing a light from a primary image, a variable power lens system (G1 to G3) for receiving the light from the front lens group G0, and performing zooming and a rear lens group G4 for forming the secondary image by condensing the light from the variable power lens system. When the zooming is performed from the high magnification end to the low magnification end, a distance between the first lens group G1 and the second lens group G2 and a distance between the second lens group G2 and the third lens group G3 are changed. The the second lens group G2 satisfies predetermined magnification conditions with respect to an axial ray from an axial object point of the primary image imaged on the secondary image and a chief ray from a position of an entrance pupil of the relay variable power optical system imaged at a position of the exit pupil.

REFERENCES:
patent: 2313460 (1943-03-01), Warmisham
patent: 3549230 (1970-12-01), Kato et al.
patent: 4341435 (1982-07-01), Lang et al.
patent: 4353624 (1982-10-01), Yonekubo
patent: 4545481 (1985-10-01), Yamada
patent: 4685776 (1987-08-01), Inoue et al.
patent: 5383058 (1995-01-01), Yonezawa
patent: 5703716 (1997-12-01), Furuta
patent: 5729385 (1998-03-01), Nishida et al.

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