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US 7,731,372 B2Granted
Projector
AssigneeQisda Corporation
InventorMing-Kuen Lin
Life of this patent
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Abstract
A projector comprises a light source unit, a light guide element, a first focus element, a second focus element, a micromirror element and an image unit. The light source unit provides a light beam. The first focus element comprises a first focal length f1. The second focus element comprises a second focal length f2, wherein 2.0 < f 2 f 1 < 3.6 . The light beam travels from the light source unit, passing the light guide element, the first focus element, the second focus element and the micromirror element to the image unit.
Claims16
A projector, comprising:
- a light source unit, providing a light beam;
- a light guide element;
- a first focus element, comprising a first focal length f1;
- a second focus element, comprising a second focal length f2, wherein
- 2.0
- <
- f
- 2
- f
- 1
- <
- 3.6
- ;
- a micromirror element;
- and
- an image unit, wherein the light beam travels from the light source unit, passing the light guide element, the first focus element, the second focus element and the micromirror element to the image unit wherein the light source unit focuses the light beam as a first arc on a first end of the light guide element, the first arc is located on a first side of the first focus element, and a first distance between the first arc and the first focus element is twice longer than the first focal length f1.
13 more elements
Dependencies are inferred from the claim text.