Objective lens for endoscope, and imaging apparatus for...

Details Objective lens for endoscope, and imaging apparatus for... Objective lens for endoscope, and imaging apparatus for...

2007-09-28

2009-02-03

Choi, William C (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S770000

Reexamination Certificate

active

07486449

ABSTRACT:
A front group consists of two concave lenses. A rear group consists of: a positive lens in which the object-side surface has a larger radius of curvature; and a cemented lens configured by a positive lens in which the object-side surface has a larger radius of curvature, and a negative meniscus lens, the cemented lens having being positive as a whole. An objective lens satisfies the following conditional expressions:in-line-formulae description="In-line Formulae" end="lead"?|dx/fF|≧3.0  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?(f/f3)×ν3<23  (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?f2×(ν5−ν4)/{RA×(Bf+d5
5)}>7   (3)in-line-formulae description="In-line Formulae" end="tail"?where dxis the distance between the groups, f, fF, and f3are the focal lengths of the objective lens, the front group, and the lens, respectively, ν3, ν4, and ν5are the Abbe numbers of the lenses, RAis the radius of curvature of the cementing surface between the lenses, Bfis the back focus, and d5and n5are the center thickness and refractive index with respect to the d-line of the lens.

REFERENCES:
patent: 5936778 (1999-08-01), Miyano et al.
patent: 10-260348 (1998-09-01), None

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