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

2006-08-15

2006-08-15

Schwartz, Jordan M. (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S771000

Reexamination Certificate

active

07092172

ABSTRACT:
The image forming optical system includes, in order from the object side, a meniscus, a first lens having positive refracting power with a convex surface directed toward the object side, an aperture stop, a meniscus, a second lens having negative refracting power with a concave surface directed toward the object side, a third lens having positive refracting power with a convex surface directed toward the image side, and a biconvex, fourth lens having positive refracting power. The fourth lens has at least one aspherical surface and satisfies the condition:in-line-formulae description="In-line Formulae" end="lead"?1.0<φm/φp<50.0in-line-formulae description="In-line Formulae" end="tail"?where φm and φp represent power of the fourth lens at a position of the maximum light height and at the paraxial position, respectively. Also, the following condition is satisfied:in-line-formulae description="In-line Formulae" end="lead"?0.3<f1/f<2.0in-line-formulae description="In-line Formulae" end="tail"?where f1 and f represent the focal lengths of the first lens and of the entire image forming optical system, respectively.

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