Optical lens
AssigneeRays Optics Inc.
InventorsSheng-Tang Lai, Hung-You Cheng, Kuo-Chuan Wang, Yuan-Hung Su
Life of this patent
Estimating the term…
Abstract
An optical lens includes a first lens group with a positive refractive power, a second lens group with a positive refractive power and an aperture stop. The first lens group and the second lens group are arranged in order from a first side to a second side, and the aperture stop is disposed between the first lens group and the second lens group. A total number of lenses with refractive powers in the optical lens is less than four, and the optical lens includes at least two lenses having an index of refraction of greater than 1.7.
Claims20
An optical lens, comprising:
- a first lens group with a positive refractive power and a second lens group with a positive refractive power arranged in order from a first side to a second side;
- and
- an aperture stop disposed between the first lens group and the second lens group, a total number of lenses with refractive powers in the optical lens being less than four, at least two lenses of the optical lens having an Abbe number of smaller than 50, and the optical lens comprising at least two lenses having an index of refraction of greater than 1.7.
An optical lens, comprising:
- a first lens group with a positive refractive power and a second lens group with a positive refractive power arranged in order from a magnified side to a minified side;
- and
- an aperture stop disposed between the first lens group and the second lens group, wherein the first lens group comprises a first lens and a second lens with refractive powers, the second lens group comprises a third lens with a refractive power, and the optical lens satisfies the conditions:
- 2.5 mm<EFL <3.0 mm and −2.0<L1f/EFL <−1.4, where EFL is an effective focal length of the optical lens, and L1f is an effective focal length of the first lens.
An optical lens, comprising:
- a first lens group with a positive refractive power and a second lens group with a positive refractive power arranged in order from a magnified side to a minified side;
- and
- an aperture stop disposed between the first lens group and the second lens group, and the optical lens comprising at least two lenses having an index of refraction of greater than 1.7, wherein the first lens group comprises a first lens with a negative refractive power and a second lens with a positive refractive power, the second lens group comprises a third lens with a positive refractive power, and the optical lens satisfies the condition:
- 0.2<L3D/LT<0.45, where L3D is a diameter of a minified-side surface of the third lens, and LT is a total lens length that is a distance along an optical axis between a magnified-side surface of the first lens and the minified-side surface of the third lens, and wherein the optical lens satisfies one of the following conditions:
- (1) the first lens is a meniscus lens, the second lens is a bi-convex lens, and the third lens is a bi-convex lens;
- (2) the first lens is an aspheric lens, the second lens is a spherical lens, and the third lens is an aspheric lens.
Dependencies are inferred from the claim text.