Image forming optical system and electronic instrument using...

Details Image forming optical system and electronic instrument using... Image forming optical system and electronic instrument using...

2006-02-28

2006-02-28

Thompson, Tim (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S790000, C359S689000, C359S784000

Reexamination Certificate

active

07006305

ABSTRACT:
An image forming optical system comprises, in order from an object side, a first positive meniscus lens having a convex surface directed toward an object side, an aperture stop, a second positive meniscus lens having a convex surface directed toward the object side and a negative lens. At least one of surfaces of the negative lens is a spherical and the following condition is satisfied:in-line-formulae description="In-line Formulae" end="lead"?−2.0<Φm/Φp<0in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?−2.0<(r1r+r2f)/(r1r−r2f)<1.0in-line-formulae description="In-line Formulae" end="tail"?where φm represents the power of the negative lens at the position of the maximum light height and φp represents the power of the negative lens at the position of the near axis, r1r represents the radius of curvature of the first lens at the image side and r2f is the radius of curvature of the second lens at the object side.

REFERENCES:
patent: 6236515 (2001-05-01), Yamamoto et al.
patent: 6560043 (2003-05-01), Saito et al.
patent: 6778777 (2004-08-01), Fujii et al.
patent: 05-188284 (1993-07-01), None
patent: 07-027974 (1995-01-01), None
patent: 09-288235 (1997-11-01), None
patent: 11-052227 (1999-02-01), None

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