Fixed focal length lens system

Details Fixed focal length lens system Fixed focal length lens system

1998-01-13

1999-12-07

Epps, Georgia

Optical: systems and elements

Lens

With reflecting element

359733, 359739, G02B 1700, G02B 900

Patent

active

059993340

ABSTRACT:
A lens system has the first and second lens components from the object side. The first lens component has a negative optical power. The second lens component has a positive optical power. The lens system fulfills the conditions: 0.0<PR.sub.L /Y'<0.5, 0.5<Pf/f<1.0. In the conditions, PR.sub.L represents a distance in a direction perpendicular to the optical axis between the optical axis and an incident position where a lower ray of a most off-axial rays enters said second lens component, Y' represents a largest image height, f represents a focal length of the entire lens system, and Pf represents a focal length of said second lens component.

REFERENCES:
patent: 3999840 (1976-12-01), Momiyama
patent: 4093348 (1978-06-01), Yasukuni
patent: 5589988 (1996-12-01), Suenaga
patent: 5619380 (1997-04-01), Ogasawara et al.
patent: 5629799 (1997-05-01), Maruyama et al.

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