Optical lens system
AssigneeYoung Optics Inc.
InventorsHung-You Cheng, Yu-Hung Chou, Ching-Lung Lai, Yi-Hua Lin, Wei-Hao Huang
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Abstract
An optical lens system using ultraviolet for imaging includes, in order from a magnified side to a minified side, a first lens group of positive refractive power and a second lens group of positive refractive power. The second lens group includes at least one cemented lens and at least one aspheric lens. The optical lens system satisfies the 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 and is equal to a product of respective internal transmittances of all of the lenses measured at a wavelength of 400 nm.
Claims20
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,
- wherein each of the lenses in the optical lens system being a single lens, and
- wherein, 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 satisfies the following conditions:
- an effective focal length of the optical lens system is in the range of 18.0912 mm to 21.5196 mm;
- and
- 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.
Dependencies are inferred from the claim text.