Optical lens
AssigneeYoung Optics Inc.
InventorSheng-Tang LAI
Life of this patent
Estimating the term…
Abstract
An optical lens includes a first lens group, a second lens group and an aperture stop. The first lens group and the second lens group are arranged in order along a direction, and the aperture stop is disposed between the first lens group and the second lens group. The second lens group has positive refractive power and a lens with a diffractive optical surface, and the optical lens satisfies the condition: 2<(Φd*V)/Φr<5, where Φd denotes refractive power of the diffractive optical surface, Or denotes refractive power of the lens, and V denotes an Abbe number of the lens.
Claims20
An optical lens, comprising:
- a first lens group and a second lens group, the first lens group and the second lens group being arranged in order along a direction;
- and
- an aperture stop disposed between the first lens group and the second lens group, wherein the second lens group has positive refractive power and a lens with a diffractive optical surface, and the optical lens satisfies the condition:
- 2<(Φd*V)/Φr<5,
- where Φd denotes refractive power of the diffractive optical surface, Φr denotes refractive power of the lens, and V denotes an Abbe number of the lens.
An optical lens, comprising:
- a first lens group with negative refractive power and a second lens group with positive refractive power, the first lens group and the second lens group being arranged in order along a direction and distinguished with each other by respective refractive powers, and the second lens group having a lens with a diffractive optical surface, wherein the optical lens satisfies the condition:
- 2<(Φd*V)/Φr<5,
- where Φd denotes refractive power of the diffractive optical surface, Φr denotes refractive power of the lens, and V denotes an Abbe number of the lens.
An optical lens, comprising:
- a first lens group;
- a second lens group with positive refractive power, the first lens group and the second lens group being arranged in order along a direction;
- and
- an aperture stop disposed between the first lens group and the second lens group, wherein a number of lenses with refractive power in the first lens group is smaller than three, a number of lenses with refractive power in the second lens group is smaller than five, the second lens group has a lens with a diffractive optical surface, and a focus shift of the optical lens is smaller than 5 μm, where the focus shift is defined as a shift in a focal plane of 850 nm infrared light relative to a standard focal plane, and the standard focal plane is a focal plane of 555 nm or 587 nm green light passing through the optical lens.
Dependencies are inferred from the claim text.