Patent ID: 6130787
Filing Date: 2000-10-10
Classification: G02B,H04N

Abstract:
An optical system consisting of, in order from the object side:a radial type gradient index lens element which has a negative refractive power of medium and a negative refractive power as a whole; anda radial type gradient index lens element which has a positive power of medium and a positive refractive power as a whole, wherein said optical system satisfies the following conditions (1) and (2):(1) .vertline.1/V.sub.1n .vertline.<0.02(2) .vertline.1/V.sub.1p .vertline.<0.02wherein the reference symbol V.sub.1n represents an Abbe's number of a medium of said radial type gradient index lens element which has the negative refractive power and the reference symbol V.sub.1p designates an Abbe's number of said radial type gradient index lens element which has the positive refractive power.