Optical lens
First Claim
1. An optical lens comprising:
- a first lens group located between a magnified side and a minified side, the first lens group having a negative refractive power and comprising a first lens, the first lens being a plastic aspheric and meniscus lens and having a negative refractive power and a convex surface facing the magnified side;
a second lens group located between the first lens group and the minified side, the second lens group having a positive refractive power and comprising a second lens, a third lens having a negative refractive power, and a fourth lens, every two of the second, the third, and the fourth lenses having an air interval between the every two of the second, the third, and the fourth lenses; and
a stop located between the first lens group and the second lens group,wherein the optical lens satisfies 2<
L/D<
4,L is a total track length of the optical lens, D is a length of a diagonal of an image sensor, an Abbe number of each of at least three of the lenses of the optical lens is greater than 20, a material of at least one of the lenses is glass, and at least one of the lenses is a spherical lens,wherein the fourth lens has a positive refractive power.
1 Assignment
0 Petitions
Accused Products
Abstract
An optical lens including a first lens group located between a magnified side and a minified side and a second lens group between the first lens group and the minified side is provided. The first lens group has a negative power and includes a first lens. The first lens is a plastic aspheric and meniscus lens. Besides, the first lens has a negative power and a convex surface facing the magnified side. The second lens group has a positive power and includes a second lens, a third lens having a negative power, and a fourth lens. Every two of the second, third, and fourth lenses have an air interval between these lenses. The Abbe number of each of at least three of the lenses is greater than 20. A material of at least one of the lenses is glass. At least one of the lenses is a spherical lens.
5 Citations
20 Claims
-
1. An optical lens comprising:
-
a first lens group located between a magnified side and a minified side, the first lens group having a negative refractive power and comprising a first lens, the first lens being a plastic aspheric and meniscus lens and having a negative refractive power and a convex surface facing the magnified side; a second lens group located between the first lens group and the minified side, the second lens group having a positive refractive power and comprising a second lens, a third lens having a negative refractive power, and a fourth lens, every two of the second, the third, and the fourth lenses having an air interval between the every two of the second, the third, and the fourth lenses; and a stop located between the first lens group and the second lens group, wherein the optical lens satisfies 2<
L/D<
4,L is a total track length of the optical lens, D is a length of a diagonal of an image sensor, an Abbe number of each of at least three of the lenses of the optical lens is greater than 20, a material of at least one of the lenses is glass, and at least one of the lenses is a spherical lens,wherein the fourth lens has a positive refractive power. - View Dependent Claims (2, 3, 4, 5)
-
-
6. An optical lens comprising:
-
a first lens group located between a magnified side and a minified side; a second lens group located between the first lens group and the minified side; and a stop located between the first lens group and the second lens group, wherein the optical lens satisfies F<
2.5, L<
20 millimeters, and 0 millimeter ≦
t<
0.02 millimeter, L is a total track length of the optical lens, F is the F-number of the lens, t is a focal shift of the optical lens relative to a visible light and a near-infrared light having the wavelength of 850 nanometers, and each of the first lens group and the second lens group respectively comprises at least one aspherical lens,wherein the first lens group has a negative refractive power and comprises at least one lens having a negative refractive power, and the second lens group has a positive refractive power and comprises at least one lens having a positive refractive power. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
-
-
14. An optical lens comprising:
-
a first lens group located between a magnified side and a minified side; a second lens group located between the first lens group and the minified side; and a stop located between the first lens group and the second lens group, wherein the optical lens satisfies F<
2.5, L<
20 millimeters, and 0 millimeter ≦
t<
0.02 millimeter, L is a total track length of the optical lens, F is the F-number of the lens, t is a focal shift of the optical lens relative to a visible light and a near-infrared light having the wavelength of 850 nanometers, and each of the first lens group and the second lens group respectively comprises at least one lens made of plastic,wherein the first lens group has a negative refractive power and comprises at least one lens having a negative refractive power, and the second lens group has a positive refractive power and comprises at least one lens having a positive refractive power. - View Dependent Claims (15, 16, 17, 18, 19, 20)
-
Specification