Optical projection system and smooth picture device thereof

• US 20070273955A1
• Filed: 12/18/2006
• Published: 11/29/2007
• Est. Priority Date: 05/26/2006
• Status: Active Grant

• Current Assignee: Delta Electronics Incorporated
• Original Assignee: Delta Electronics Incorporated
• Inventors: Chang, Sean, Yang, Hung-Kuang
• Granted Patent: US 8,016,429 B2
• Time in Patent Office: Days
• US Class Current: 359/292
• CPC Class Codes: G02B 26/10 Scanning systems
• CPC Class Codes: H04N 9/315 Modulator illumination systems general applications of lighting devices F21V; general optical systems G02B; lamp houses for projectors not peculiar to the presence of an electronic spatial light modulator G03B21/20

Abstract

A smooth picture device includes an optical element, a holder, a flexible member, a base and an actuator. The holder supports the optical element. At least one portion of the holder is coupled to the flexible member. The base supports the flexible member. The actuator is coupled to the holder and actuates the holder to vibrate.

Claims

1. A smooth picture device comprising:

an optical element;

a holder for supporting the optical element;

a flexible member, wherein the holder has at least one portion coupled to the flexible member and an another portion suspended out of the flexible member;

a base for supporting the flexible member; and

an actuator coupled to the holder for actuating the holder to vibrate.

2. The smooth picture device according to claim 1, wherein the flexible member has two cantilevers and each of opposite sides of the holder is extended to form a connecting part to be connected to the cantilevers.

3. The smooth picture device according to claim 1, wherein the base comprises at least one first supporting element for supporting the flexible member.

4. The smooth picture device according to claim 3, wherein the base is formed with at least one second supporting element for supporting the flexible member, and the first supporting element and the second supporting element are respectively disposed on opposite sides of a connecting part.

5. The smooth picture device according to claim 1, wherein the holder comprises an actuating arm coupled to the actuator.

6. The smooth picture device according to claim 5, wherein the actuator comprises at least one coil and at least one first magnetic element, the first magnetic element is disposed on the base, and the coil corresponds to the first magnetic element and is wound in a through hole of the actuating arm.

7. The smooth picture device according to claim 6, wherein the first magnetic element or the second magnetic element is a permanent magnet.

8. The smooth picture device according to claim 1, further comprising at least one fulcrum assembly disposed between the holder and the base.

9. The smooth picture device according to claim 8, wherein the fulcrum assembly comprises a second magnetic element and a soft magnetic element, the second magnetic element is disposed on the holder and the soft magnetic element corresponds to the second magnetic element and is disposed on the base.

10. The smooth picture device according to claim 9, wherein the soft magnetic element is made of a metal material.

11. The smooth picture device according to claim 1, wherein the optical element is transparent glass or a reflector.

12. The smooth picture device according to claim 1, being applied to a transmissive smooth picture element.

13. An optical projection system comprising:

a light source for generating a light;

an optical modulating assembly for modulating the light into a modulated light;

a projection lens set for receiving the modulated light and projecting the modulated light onto a display screen to form a picture; and

a smooth picture device disposed in a light path of the light, wherein the smooth picture device comprises an optical element, a holder, an flexible member, a base and an actuator, the holder supports the optical element, at least one portion of the holder is coupled to the flexible member, an another portion of the holder is suspended out of the flexible member, the base supports the flexible member, and the actuator is coupled to the holder and actuates the holder to vibrate.

14. The optical projection system according to claim 13, wherein the flexible member has two cantilevers, and each of opposite sides of the holder comprises a connecting part to be connected to the cantilevers.

15. The optical projection system according to claim 14, wherein the base comprises at least one first supporting element for supporting the flexible member, at least one second supporting element for supporting the flexible member, and the first supporting element and the second supporting element are respectively disposed on opposite sides of the connecting part.

16. The optical projection system according to claim 13, wherein the holder comprises an actuating arm coupled to the actuator the actuator comprises at least one coil and at least one first magnetic element, the first magnetic element is disposed on the base, and the coil corresponds to the first magnetic element and is wound in a through hole of the actuating arm.

17. The optical projection system according to claim 13, further comprising at least one fulcrum assembly disposed between the holder and the base the fulcrum assembly comprises a second magnetic element and a soft magnetic element, the second magnetic element is disposed on the holder and the soft magnetic element corresponds to the second magnetic element and is disposed on the base.

18. The optical projection system according to claim 13, wherein the optical element is transparent glass or a reflector.

19. The optical projection system according to claim 13, wherein the projection lens set comprises a straight-type lens barrel or turning-type lens barrel, and the smooth picture device abuts on or connects with the lens barrel.

20. The optical projection system according to claim 19, wherein the projection lens set further comprises at least one lens accommodated in the lens barrel for receiving the modulated light and amplifying and projecting the modulated light onto the display screen to form the picture.

21. The optical projection system according to claim 13, wherein the optical modulating assembly comprises a filter for filtering the light emitted from the light source, and a DMD (digital micro-mirror device) for receiving the light passing through the filter and modulating the light path of the light.