Ophthalmic lens
AssigneeYoung Optics Inc.
InventorsCHING-SHENG CHANG, CHENG-HUNG CHEN, CHING-LUN LIN
Life of this patent
Estimating the term…
Abstract
An ophthalmic lens includes a first lens group having a positive refractive power, a second lens group having a positive refractive power, and a third lens group having a positive refractive power. The first lens group includes a first lens, and a lens in the second lens group closest to the first lens group is a second lens. The ophthalmic lens satisfies the condition of 0.65<R1/R2<7.69, where R1 is a shortest distance from a central axis of an optical surface of the first lens to an outermost turning point of the optical surface of the first lens, and R2 is a shortest distance from a central axis of an optical surface of the second lens to an outermost turning point of the optical surface of the second lens.
Claims20
An ophthalmic lens, comprising:
- a first lens group having a positive refractive power and including a first lens, and the first lens being an aspheric lens;
- a second lens group having a positive refractive power and including three lenses, one of the three lenses being an aspheric lens, a lens in the second lens group closest to the first lens group being a second lens, and the three lenses including two closely adjacent surfaces having substantially the same curvatures;
- a third lens group having a positive refractive power and including two lenses, and one of the two lenses being an aspheric lens;
- and
- an aperture stop disposed between the second lens group and the third lens group;
- wherein a total number of lenses with refractive powers of the ophthalmic lens ranges from 6 to 9, and the ophthalmic lens satisfies the following conditions:
- 0.36<L1/LT<1.12, where L1 is a distance between the first lens group and the second lens group measured along an optical axis of the ophthalmic lens, and LT is a distance measured along the optical axis between two outermost lens surfaces at opposite ends of the ophthalmic lens;
- 0.65<R1/R2<7.69, where R1 is a shortest distance from a central axis of an optical surface of the first lens to an outermost turning point of the optical surface of the first lens, and R2 is a shortest distance from a central axis of an optical surface of the second lens to an outermost turning point of the optical surface of the second lens;
- and
- 14.18<|LT/EFL|<41.69, where EFL is an effective focal length of the ophthalmic lens.
An ophthalmic lens, comprising:
- a first lens group having a positive refractive power and including a first lens, and the first lens being an aspheric lens;
- a second lens group having a positive refractive power and including three lenses, and the three lenses including an aspheric lens and a cemented lens;
- and
- a lens module interface for coupling the ophthalmic lens with a lens module or a smartphone;
- wherein the ophthalmic lens satisfies the following condition:
- 0.65<R1/R2<7.69, where R1 is a shortest distance from a central axis of an optical surface of the first lens to an outermost turning point of the optical surface of the first lens, and R2 is a shortest distance from a central axis of an optical surface of the second lens to an outermost turning point of the optical surface of the second lens.
Dependencies are inferred from the claim text.