Imaging lens

Details Imaging lens Imaging lens

1998-03-19

1999-10-12

Epps, Georgia

Optical: systems and elements

Lens

Multiple component lenses

359739, 359771, 359772, G02B 934, G02B 900

Patent

active

059662514

ABSTRACT:
Successively from an object side, a stop, a biconvex lens, a biconcave lens, a biconvex lens, and a meniscus lens having a convex surface directed onto the image side are disposed, while the image-side surfaces of the second and third lenses are set to have a predetermined range of power, thereby favorably correcting various kinds of aberration, such as distortion in particular, while reducing the size of the whole lens system. Disposed successively from the object side are a stop i, a first lens L.sub.1 made of a biconvex lens, a second lens L.sub.2 made of a biconcave lens, a third lens L.sub.3 made of a biconvex lens, and a fourth lens L.sub.4 made of a meniscus lens having a convex surface directed onto the image side. These lenses satisfy the following conditional expressions :

REFERENCES:
patent: 2962930 (1960-12-01), Johnson
patent: 3011402 (1961-12-01), Johnson
patent: 3359057 (1967-12-01), Ackroyd
patent: 3438696 (1969-04-01), Ruben
patent: 3443863 (1969-05-01), Ruben
patent: 3449041 (1969-06-01), DeJager
patent: 4093348 (1978-06-01), Yasukuni
patent: 4620775 (1986-11-01), Fujioka

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