Imaging lens and imaging apparatus

Details Imaging lens and imaging apparatus Imaging lens and imaging apparatus

2007-04-17

2007-04-17

Schwartz, Jordan M. (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S794000, C359S740000

Reexamination Certificate

active

11205126

ABSTRACT:
An imaging lens system includes a first lens having a meniscus profile with a convex surface facing an object side and having a positive refractive index; an aperture diaphragm; and a second lens having a meniscus profile with a convex surface facing an image side and having a positive refractive index, wherein the first lens, the aperture diaphragm, and the second lens are arranged in this order from the object side. The imaging lens satisfies conditional expressions where f represents a focal distance of a total lens system, f1 represents a focal distance of the first lens, and L represents a distance on the optical axis from the surface on the object side of the first lens to an image plane wherein calculation is done in terms of an air-equivalent thickness for a back insertion glass, and n(ave) represents an average value of refractive indexes at d-lines of the first and second lenses.

REFERENCES:
patent: 5000552 (1991-03-01), Simpson et al.
patent: 5067803 (1991-11-01), Ohno
patent: 5166830 (1992-11-01), Ishibai et al.
patent: 6992841 (2006-01-01), Saito et al.
patent: 2003-215446 (2003-07-01), None
patent: 2004-004566 (2004-01-01), None

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