Total internal reflection Fresnel lens and optical system using the same
First Claim
1. An optical system comprising:
- a light source;
a light-receiving surface facing the light source to receive light therefrom; and
a first structured surface opposite a first portion of the light-receiving surface, the first structured surface including a plurality of first reflecting surfaces projecting at a plurality of first angles relative to the light-receiving surface and a plurality of first refractive surfaces projecting at a plurality of second angles relative to the light-receiving surface, each of the first refractive surfaces receiving light from a corresponding one of the first reflective surfaces for refractive transmission therethrough, wherein a first one of the first angles is different than a second one of the first angles, and a first one of the second angles is different than a second one of the second angles.
1 Assignment
0 Petitions
Accused Products
Abstract
Described is an optical lens having a light-receiving surface facing a light source and a first structured surface opposite a first portion of the light-receiving surface. The first structured surface includes a plurality of first reflecting surfaces and first refractive surfaces. Each of the first refractive surfaces receives light from a corresponding first reflective surface for refractive transmission therethrough. The optical system may further include a second structured surface opposite a second portion of the light-receiving surface. The second structured surface includes a plurality of second refractive surfaces. Each of the second refractive surfaces receives light directly from the light-receiving surface. Where the first and second structured surfaces are included, the first and second portions of the light-receiving surface can be positioned so that light projected from the light source at an angle above a threshold angle falls on the first portion and light at an angle below the threshold angle falls on the second portion.
22 Citations
34 Claims
-
1. An optical system comprising:
-
a light source; a light-receiving surface facing the light source to receive light therefrom; and a first structured surface opposite a first portion of the light-receiving surface, the first structured surface including a plurality of first reflecting surfaces projecting at a plurality of first angles relative to the light-receiving surface and a plurality of first refractive surfaces projecting at a plurality of second angles relative to the light-receiving surface, each of the first refractive surfaces receiving light from a corresponding one of the first reflective surfaces for refractive transmission therethrough, wherein a first one of the first angles is different than a second one of the first angles, and a first one of the second angles is different than a second one of the second angles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. A rear projection display system, comprising:
-
a light source; an optical lens, wherein the optical lens includes a light-receiving surface facing the light source to receive light therefrom, and a first structured surface opposite a first portion of the light-receiving surface, the first structured surface including a plurality of first reflecting surfaces projecting at a plurality of first angles relative to the light-receiving surface and a plurality of first refractive surfaces projecting at a plurality of second angles relative to the light-receiving surface, each of the first refractive surfaces receiving light from a corresponding one of the first reflective surfaces for refractive transmission therethrough; an enclosure situating the light source and optical lens; and a projection screen disposed to receive light from the optical lens and transmitting light received from the optical lens in a viewing direction, wherein the light source is situated at a light source angle greater than forty-two degrees. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
-
-
30. An optical lens comprising:
-
a light-receiving surface for receiving light; and a first structured surface opposite a first portion of the light-receiving surface, the first structured surface including a plurality of first reflecting surfaces projecting at a plurality of first angle relative to the light-receiving surface and a plurality of first refractive surfaces projecting at a plurality of second angles relative to the light-receiving surface, each of the first refractive surfaces configured to receive light from a corresponding one of the first reflective surfaces for refractive transmission therethrough, wherein a first one of the first angles is different than a second one of the first angles, and a first one of the second angles is different than a second one of the second angles. - View Dependent Claims (31, 32, 33, 34)
-
Specification