Optical system for non-flexible endoscopes

Details Optical system for non-flexible endoscopes Optical system for non-flexible endoscopes

1996-10-18

1999-08-03

Nguyen, Thong

Optical: systems and elements

Compound lens system

With relay

359434, G02B 934

Patent

active

059332751

ABSTRACT:
A relay lens system used in an observation optical system which is to be disposed in an insert section is disclosed. The relay lens system comprises a plurality of relay lens units at least one of which allows longitudinal chromatic aberration to remain in an undercorrected tendency and at least another of which allows longitudinal chromatic aberration to remain in an overcorrected tendency, thereby correcting longitudinal chromatic aberration favorably in the relay lens system as a whole.

REFERENCES:
patent: 4025155 (1977-05-01), Imai
patent: 4300812 (1981-11-01), Nakahashi
patent: 4575195 (1986-03-01), Hoogland
patent: 4693568 (1987-09-01), Takahashi
patent: 4784118 (1988-11-01), Fantone et al.
patent: 5005955 (1991-04-01), Ohshita
patent: 5142410 (1992-08-01), Ono et al.
patent: 5625488 (1997-04-01), Dietzsch et al.
patent: 5632718 (1997-05-01), Igarashi et al.

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