Imaging lens, imaging unit, and optical device

Details Imaging lens, imaging unit, and optical device Imaging lens, imaging unit, and optical device

2004-09-10

2009-02-17

Schwartz, Jordan M. (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S739000

Reexamination Certificate

active

07492533

ABSTRACT:
The object is to obtain an imaging lens system having an entire lens system downsized, being excellent in portability, and being compatible with a large number of pixels by which a favorable image quality is provided. Provided is an imaging lens system for forming an optical image of an object on a light receiving surface of a solid-state image sensor, comprising, in order from an object side, an aperture diaphragm (100), a first lens element (101) having a positive optical power and a convex surface on an image side, a second lens element (102) having a negative optical power and being a meniscus lens whose object side has a concave shape, and a third lens element (103) having a positive optical power and being a meniscus lens whose object side has a convex shape, in which the following conditional expressions are satisfied:in-line-formulae description="In-line Formulae" end="lead"?1.9<|fd/f2d|<3.5in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.9<|fd/f3d|<2.0in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?−2.5<(r201+r202)/(r201−r202)<−1.4in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?−1.7<(r301+r302)/(r301−r302)<−1.0.in-line-formulae description="In-line Formulae" end="tail"?

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