Imaging lens

Details Imaging lens Imaging lens

1998-03-31

1999-08-17

Epps, Georgia

Optical: systems and elements

Lens

359645, G02B 300, G02B 2500

Patent

active

059402199

ABSTRACT:
Each of first and second lenses, which are in meniscus forms with concave surfaces opposing each other, is made as a plastic lens having at least one aspheric surface, and the whole lens system has a three-sheet lens configuration, thereby achieving a smaller size and a lower cost, while making it easy to restrain focus from fluctuating upon changes in temperature. Disposed successively from the object side are a first lens L.sub.1 in a low-power meniscus form made of a plastic having a convex surface directed onto the object side, whose both surfaces are aspherical; a second lens L.sub.2 in a low-power meniscus form made of a plastic having a concave surface directed onto the object side, whose both surfaces are aspherical; and a third lens L.sub.3 in a meniscus form made of a glass with a positive refracting power having a convex surface directed onto the object side. A luminous flux incident on the imaging lens from the object side along an optical axis X forms an image on an imaging surface (light-receiving surface of a solid-state imaging device) 1.

REFERENCES:
patent: 5066113 (1991-11-01), Nakajima et al.

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