Optical system for taking image

Details Optical system for taking image Optical system for taking image

2007-09-25

2007-09-25

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S773000, C359S774000

Reexamination Certificate

active

11539175

ABSTRACT:
An optical system comprises from the object side: a positive first lens element, a negative second lens element, a positive third lens element, a fourth lens element, and an aperture stop located between the object side of the optical system and the second lens element for controlling the brightness of the optical system. A radius of curvature R3of a front surface of the second lens element satisfies the relation: −0.02 [1/mm]<1/R3<0.22 [1/mm], an Abbe number V2of the second lens element is less than 40. A focal length of the fourth lens element is f4, a focal length of the optical system is f, they satisfy the relation: f/f4<0.1, at least one inflection point is formed on the rear surface of the fourth lens element.

REFERENCES:
patent: 2007/0081259 (2007-04-01), Noda

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