Infrared optical lens system
View Patent ↗An infrared optical lens system including: a first lens which comprises a crystalline material; and a second lens which comprises an amorphous material and is formed by using molding processing, wherein a refractive index of the first lens is greater than that of the second lens, and the first lens and the second lens are disposed in the order from an object to an image.
1. An infrared optical lens system comprising:
a first lens which comprises a crystalline material; and
a second lens which comprises an amorphous material and is formed by using molding processing,
wherein a refractive index of the first lens is greater than a refractive index of the second lens,
wherein the first lens and the second lens are disposed in an order from an object to an image,
wherein only the first lens and the second lens, without any other lenses, are disposed between the object and the image, and
wherein a focal distance of the infrared optical lens system is equal to or greater than 100 mm.
2. The infrared optical lens system of claim 1 , wherein the focal distance of the infrared optical lens system is in a range of 100 mm to about 150 mm.
3. The infrared optical lens system of claim 1 , wherein the first lens comprises at least one aspheric surface.
4. The infrared optical lens system of claim 1 , wherein the first lens comprises an aspheric surface that faces the image.
5. The infrared optical lens system of claim 1 , wherein the second lens comprises at least one aspheric surface.
6. The infrared optical lens system of claim 1 , wherein a refractive index of the first lens is from about 3.2 to about 4.1.
7. The infrared optical lens system of claim 6 , wherein a refractive index of the second lens is from about 2.45 to about 2.65.
8. The infrared optical lens system of claim 1 , wherein a refractive index of the second lens is from about 2.45 to about 2.65.
9. The infrared optical lens system of claim 1 , wherein the first lens has a positive refractive power and the second lens has a negative refractive power.
10. The infrared optical lens system of claim 1 , wherein the amorphous material comprises a chalcogenide material.
11. An infrared optical lens system comprising:
a first lens which comprises a crystalline material; and
a second lens which comprises an amorphous material,
wherein the first lens and the second lens are disposed in an order from an object to an image and transmit infrared rays,
wherein a refractive index of the first lens is greater than a refractive index of the second lens,
wherein only the first lens and the second lens, without any other lenses, are disposed between the object and the image, and
wherein a focal distance of the infrared optical lens system is equal to or greater than 100 mm.
12. The infrared optical lens system of claim 11 , wherein the crystalline material is selected from the group consisting of germanium, ZnSe, ZnS, sapphire and silicon.
13. The infrared optical lens system of claim 11 , wherein at least one of a surface of the first lens which faces the image and a surface of the first lens which faces the object is an aspheric surface.
14. The infrared optical lens system of claim 13 , wherein at least one of a surface of the second lens which faces the image and a surface of the second lens which faces the object is an aspheric surface.
15. The infrared optical lens system of claim 11 , wherein both a surface of the first lens which faces the image and a surface of the first lens which faces the object are aspheric surfaces.
16. The infrared optical lens system of claim 15 , wherein both a surface of the second lens which faces the image and a surface of the second lens which faces the object are aspheric surfaces.
17. The infrared optical lens system of claim 11 , wherein the amorphous material comprises a chalcogenide material.