PROJECTION OPTICAL SYSTEM

• US 20090033887A1
• Filed: 02/29/2008
• Published: 02/05/2009
• Est. Priority Date: 07/30/2007
• Status: Active Grant

• Current Assignee: Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hon Hai Precision Industry Co., Ltd.
• Inventors: Lin, Ming-Te, Yeh, Wen-Pin
• Granted Patent: US 7,841,727 B2
• Time in Patent Office: Days
• US Class Current: 353/99
• CPC Class Codes: G03B 21/008 using micromirror devices
• CPC Class Codes: G03B 21/2066 Reflectors in illumination beam in projection beam G03B21/28
• CPC Class Codes: G03B 21/208 Homogenising, shaping of the illumination light
• CPC Class Codes: Y10S 359/904 Micromirror

Abstract

A projection optical system includes a digital micro-mirror device and a light blocker disposed along the light path of the digital micro-mirror device. The digital micro-mirror device includes a base having a plurality of outer pads, a micro-mirror array disposed on the base, and a plurality of bonding wires. The bonding wires are electrically connecting the outer pads with the corresponding micro-mirror array. The light blocker is configured for blocking the light incident to the bonding wires and the light reflected by the bonding wires.

Claims

1. A projection optical system, comprising:

a digital micro-mirror device comprising a base having a plurality of outer pads, a micro-mirror array disposed on the base, and a plurality of bonding wires electrically connecting the outer pads with the corresponding micro-mirror array; and

a light blocker disposed along the light path of the digital micro-mirror device and configured for blocking the light incident to the bonding wires and the light reflected by the bonding wires.

2. The projection optical system as claimed in claim 1, wherein the light blocker is disposed along the light path of the light output from the digital micro-mirror device to block the light reflected by the bonding wires being projected.

3. The projection optical system as claimed in claim 1, wherein the light blocker is disposed along the light path of the light input to the digital micro-mirror device to block the light incident on the bonding wires.

4. The projection optical system as claimed in claim 1, wherein the light blocker is comprised of opaque resin.

5. The projection optical system as claimed in claim 1, wherein a color of the light blocker is black.

6. The projection optical system as claimed in claim 1, wherein the light blocker is a frame-shaped plate.

7. The projection optical system as claimed in claim 1, wherein the light blocker comprises a first L-shaped portion and a second L-shaped portion.

8. The projection optical system as claimed in claim 7, wherein the first L-shaped portion and the second L-shaped portions are spaced from each other and disposed along the light path at a light emitting side of the digital micro-mirror device.

9. The projection optical system as claimed in claim 7, wherein the first and second L-shaped plates are spaced from each other and are disposed along the light path at a light incident side of the digital micro-mirror device.

10. The projection optical system as claimed in claim 7, wherein the first L-shaped plate is disposed along the light path at a light emitting side of the digital micro-mirror device and the second L-shaped plate is disposed along the light path at a light incident side of the digital micro-mirror device.