Optical system and projector
AssigneeHimax Display, Inc.
InventorsLI TAN, Hoi-Sing Kwok
Life of this patent
Estimating the term…
Abstract
An optical system and a projector utilizing the optical system can prevent tilted projection, hence ensuring that keystone distortion will not occur. The inventive optical system includes a lens group and a reflection layer. The lens group has a plurality of lens elements, and is utilized for guiding an input light beam. A shape of each of lens elements is substantially identical to a shape of a half of a rotationally symmetrical lens. The reflection layer is disposed under the lens group, and utilized for reflecting an incident light beam. As a result, the optical system is configured for guiding the output light beam derived from the input light beam to be projected onto an area substantially higher than a common line.
Claims13
An optical system, comprising:
- a reflection layer;
- and
- a lens group, having a plurality of lens elements, disposed on the reflection layer, each of the lens elements has a section, a light incident surface facing towards an object side, a light emitting surface facing towards an image side, wherein the section is between the light incident surface and the light emitting surface;
- wherein a shape of each of lens elements is substantially identical to a shape of a half of a rotationally symmetrical lens, and the section of each of lens elements is in contact with the reflection layer.
A projector, comprising:
- a projecting module, for generating an output light beam corresponding to an image to be projected;
- and
- an optical system, for guiding the output light beam to be imaged onto an area substantially higher than a common line, comprising:
- a reflection layer, disposed along the common line;
- and
- a lens group, having a plurality of lens elements, disposed on the reflection layer, each of the lens elements has a section, a light incident surface facing towards an object side, a light emitting surface facing towards an image side, wherein the section is between the light incident surface and the light emitting surface;
- wherein a shape of each of lens elements is substantially identical to a shape of a half of a rotationally symmetrical lens, and the section of each of lens elements is in contact with the reflection layer.
Dependencies are inferred from the claim text.