Imaging lens

Details Imaging lens Imaging lens

1999-02-19

2000-06-13

Epps, Georgia

Optical: systems and elements

Lens

Reverse telephoto

359770, 359761, 359740, G02B 1304, G02B 960

Patent

active

060756586

ABSTRACT:
An imaging lens is disclosed having two lens groups, both of positive refractive power, a diaphragm positioned between the lens groups, and five or fewer lens elements with no aspherical surfaces. The imaging lens provides a high resolution over a wide image angle. During focusing, only the position of the rear lens group is adjusted relative to the image surface, enabling a low-cost shutter mechanism to be employed as the diaphragm. The front lens group includes, in order from the object side, either a plano-concave or a biconcave lens element and, in addition, a biconvex lens element. The rear lens group includes, in order from the object side, a positive meniscus lens element with its convex surface on the image side, a negative meniscus lens element with its concave surface on the image side, and a biconvex lens element. By having the ratio of the focal length of the positive meniscus lens element of the rear lens group divided by the focal length of the imaging lens be greater than 1.4 and less than 4.2, distortion is minimized.

REFERENCES:
patent: 222132 (1879-12-01), Gundlach
patent: 1882530 (1932-10-01), Tronnier
patent: 2407219 (1946-09-01), Bennett
patent: 3490825 (1970-01-01), Takahashi
patent: 3731989 (1973-05-01), Shimizu
patent: 3799655 (1974-03-01), Laikin
patent: 5539581 (1996-07-01), Sato
patent: 5589988 (1996-12-01), Suenaga
patent: 5696633 (1997-12-01), Nakajima
patent: 5963381 (1999-10-01), Ori

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