Patent ID: 6804067
Filing Date: 2004-10-12
Classification: G02B

Abstract:
A single focus lens that is formed of only three lens components, in order from the object side, as follows:a first lens component that has positive refractive power and includes a first lens element; an aperture diaphragm; a second lens component that has positive refractive power, that has at least one aspheric lens surface, and that includes a second lens element made of plastic; and a third lens component that has positive refractive power, that has at least one aspheric lens surface, and that includes a third lens element made of plastic; wherein the following conditions are satisfied:1.01/f<5.0 50>&ngr;1 wheref1 is the focal length of said first lens component, f is the focal length of the single focus lens, and &ngr;1 is the Abbe number of said first lens element at the d-line of 587.6 nm.