Patent ID: 11899188
Assignee: YOUNG OPTICS INC.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An optical lens system for imaging, comprising in order from a magnified side to a minified side:
a first lens group of positive refractive power comprising a first lens and a second lens; and
a second lens group of positive refractive power comprising a third lens and a fourth lens, wherein one of the third lens and the fourth lens includes one aspheric surface, each of the lenses in the optical lens system is a singlet lens, and, during focusing, the first lens group remains stationary and the second lens group is movable in a direction of an optical axis, and the optical lens system satisfies a condition of TE(λ=400)>94%, where TE(λ=400) denotes an overall transmittance of all of the lenses in the optical lens system measured at a wavelength of 400 nm.