Imaging optical system and electronic apparatus using the same

Details Imaging optical system and electronic apparatus using the same Imaging optical system and electronic apparatus using the same

2007-03-13

2007-03-13

Dinh, Jack (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S771000

Reexamination Certificate

active

10867222

ABSTRACT:
The image forming optical system comprises in order from an object side,a first lens having positive refracting power and a concave surface directed toward an object side,a second lens having double convex surfaces, an aperture stop,a third lens which is meniscus lens having negative refracting power and a convex surface directed toward an image side, and a fourth lens having positive refracting power. Each surface at an object side and at an image side of the fourth lens is formed an aspherical surface having radius of curvature which decreases toward a circumferential portion, and the following condition is satisfied:in-line-formulae description="In-line Formulae" end="lead"?0.05<φm/φp<0.90−2.0<r1f/f<−0.1in-line-formulae description="In-line Formulae" end="tail"?where φm represents the power of the fourth lens at the position of the maximum light height, φp is the power of the fourth lens at the position of the praxis, r1f is the radius of curvature of the first lens at the object side, and f is the focal length of the image forming optical system as a whole system.

REFERENCES:
patent: 5589988 (1996-12-01), Suenaga
patent: 5850312 (1998-12-01), Kato et al.
patent: 6414802 (2002-07-01), Betensky
patent: 2005/0013017 (2005-01-01), Amanai
patent: 11-030745 (1999-02-01), None
patent: 11-084234 (1999-03-01), None
patent: 2000-171697 (2000-06-01), None

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