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Projection system and optical path transfer device thereof

a technology of optical path transfer and projection system, which is applied in the direction of material analysis through optical means, television systems, instruments, etc., can solve the problem of reducing the illumination efficiency of the projection system b>100, and achieve the effect of effectively enhancing the illumination efficiency

Inactive Publication Date: 2006-11-30
CHANG SEAN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a projection system with an optical path switching device that can efficiently switch and direct a light beam towards a light receiving device. The system includes a light source, relay module, optical path switching device, and optical path transfer device. The optical path transfer device has an incident surface tilted in a direction perpendicular to the incident direction of the light beam and is designed to minimize deformation of the illumination area due to off-axis incidence. The illumination area of the light beam projected on the optical path switching device is fully enclosed by the active area, resulting in significantly enhanced illumination efficiency. The projection system can also include a reflector, color wheel, light tunnel, display device, or projection lens, among others.

Problems solved by technology

Accordingly, luminosity waste occurs in the DMD 114, which reduces the illumination efficiency of the projection system 100.

Method used

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  • Projection system and optical path transfer device thereof
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  • Projection system and optical path transfer device thereof

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Embodiment Construction

[0031]FIG. 4A is a perspective view of an embodiment of the optical path transfer device 200 of the present invention. A top view of the X-Z plane in FIG. 4A is shown in FIG. 4B. Referring to both FIGS. 4A and 4B, the optical path transfer device 200 includes at least two parts 200a and 200b, and an air gap 208 disposed between these two parts 200a, 200b. The incident surface 202 of the first part 200a tilts perpendicular to the incidence of the light beam I, and an angle α is formed between the normal of the incident surface 202 and the normal of the two side surfaces 204. The optical path transfer device 200 alters the light beam in a direction different from the incident direction thereof.

[0032] The optical path transfer device 200 can be a total internal reflection prism (TIR prism) or a reversed total internal reflection prism (reversed TIR prism). The first and second parts 200a and 200b can be prisms, made of glass or any other photoconductive material with a refractive inde...

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Abstract

A projection system. The projection system has a light source, a relay module, an optical path switching device and an optical path transfer device. The light source emits a light beam, and the relay module relays the light beam. The optical path switching device is used to receive and switch the light beam and has at least one active area. The optical path transfer device is disposed between the relay module and the optical path switching device directing the light beam toward the optical path switching device in a first angle, and the optical path transfer device has an incident surface tilted perpendicular to an incidence of the light beam.

Description

[0001] This application is a Divisional of co-pending application Ser. No. 10 / 901,118, filed on Jul. 29, 2004, which claims priority under 35 U.S.C. §119(a) on Patent Application No(s). 092121044 filed in Taiwan, Republic of China on Jul. 31, 2003, the entire contents of which are hereby incorporated by reference and for which priority is claimed under 35 U.S.C. §120.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a projection system and an optical path transfer device thereof, and particularly to a projection system and an optical path transfer device thereof with high illumination efficiency. [0004] 2. Description of the Related Art [0005] In a conventional optical projection display, a light beam emitted from a light source is projected toward a digital micromirror device (DMD). The DMD is formed with a plurality of micromirrors selectively disposed in one of two predetermined tilt angles, in which the light beam is guided and ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01J3/14G02B5/04G02B17/04G02B19/00G02B26/08G03B21/00H04N5/74
CPCG02B17/04H04N5/7416G02B26/0833
Inventor CHANG, SEANLIN, ALBERT
Owner CHANG SEAN