Color wheel and projection device

Patent metadata

Field	Value
Publication number	US-9470887-B2
Application number	US-201514740270-A
Country	US
Kind code	B2
Filing date	Jun 16, 2015
Priority date	Sep 11, 2014
Publication date	Oct 18, 2016
Grant date	Oct 18, 2016

Abstract

A color wheel is suitable for being disposed at a transmission path of an illumination beam emitted from a light source of a projection device. The color wheel includes a disc. The disc is suitable for rotating with respect to an axis. The disc has a non-light converting region and a light converting region. The disc has a first reference surface and a second reference surface opposite to the first reference surface. The disc has a plurality of first disturbing portions and a plurality of second disturbing portions. The first disturbing portions are located at the first reference surface and in the non-light converting region. The second disturbing portions are located at the second reference surface and in the non-light converting region. The first disturbing portions and the second disturbing portions are structurally continuous relative to the disc.

First claim

What is claimed is:

1. A color wheel, adapted to be disposed at a transmission path of an illumination beam emitted from a light source of a projection device, the color wheel comprising:
a disc suitable for rotating with respect to an axis, wherein the disc has a non-light converting region and a light converting region, the disc has a first reference surface and a second reference surface opposite to the first reference surface, the disc has a plurality of first disturbing portions and a plurality of second disturbing portions, the first disturbing portions are located at the first reference surface and located in the non-light converting region, the second disturbing portions are located at the second reference surface and located in the non-light converting region, and the first disturbing portions and the second disturbing portions are structurally continuous relative to the disc.

2. The color wheel as claimed in claim 1 , wherein the disc has a plurality of concave-convex structures, and the concave-convex structures are located in the non-light converting region, and each of the concave-convex structures forms one of the first disturbing portions and the corresponding second disturbing portion.

3. The color wheel as claimed in claim 2 , wherein a height of each of the concave-convex structures protruding out of the first reference surface or the second reference surface is smaller than 1.5 times of a thickness of the disc.

4. The color wheel as claimed in claim 2 , wherein a part of the concave-convex structures protrude out of the first reference surface, and the other concave-convex structures are recessed in the first reference surface, and the concave-convex structures protruding out of the first reference surface and the concave-convex structures recessed in the first reference surface are alternately arranged around the axis.

5. The color wheel as claimed in claim 2 , wherein each of the concave-convex structures has a top surface and a side surface, the top surface is substantially parallel to the first reference surface or the second reference surface, and the side surface is substantially perpendicular to the top surface.

6. The color wheel as claimed in claim 2 , wherein the concave-convex structures have a linear radial distribution, an arc radial distribution or irregular radial distribution relative to the axis.

7. The color wheel as claimed in claim 1 , wherein each of the first disturbing portions protrudes out of the first reference surface or is recessed in the first reference surface.

8. The color wheel as claimed in claim 7 , wherein a height of each of the first disturbing portions protruding out of the first reference surface is smaller than 1.5 times of a thickness of the disc, or a depth of each of the first disturbing portions recessed in the first reference surface is smaller than 1.5 times of a thickness of the disc.

9. The color wheel as claimed in claim 1 , wherein each of the second disturbing portions protrudes out of the second reference surface or is recessed in the second reference surface.

10. The color wheel as claimed in claim 9 , wherein a height of each of the second disturbing portions protruding out of the second reference surface is smaller than 1.5 times of a thickness of the disc, or a depth of each of the second disturbing portions recessed in the second reference surface is smaller than 1.5 times of a thickness of the disc.

11. A projection device, comprising:
a light source adapted to emit an illumination beam;
a light valve disposed at a transmission path of the illumination beam, and converting the illumination beam into an image beam;
a projection lens disposed at a transmission path of the image beam, and projecting the image beam; and
a color wheel disposed at the transmission path of the illumination beam and disposed between the light source and the light valve, and comprising:
a disc, suitable for rotating with respect to an axis, wherein the disc has a non-light converting region and a light converting region, the disc has a first reference surface and a second reference surface opposite to the first reference surface, the disc has a plurality of first disturbing portions and a plurality of second disturbing portions, the first disturbing portions are located at the first reference surface and located in the non-light converting region, the second disturbing portions are located at the second reference surface and located in the non-light converting region, and the first disturbing portions and the second disturbing portions are structurally continuous relative to the disc.

12. The projection device as claimed in claim 11 , wherein the disc has a plurality of concave-convex structures, and the concave-convex structures are located in the non-light converting region, and each of the concave-convex structures forms one of the first disturbing portions and the corresponding second disturbing portion.

13. The projection device as claimed in claim 12 , wherein a height of each of the concave-convex structures protruding out of the first reference surface or the second reference surface is smaller than 1.5 times of a thickness of the disc.

14. The projection device as claimed in claim 12 , wherein a part of the concave-convex structures protrude out of the first reference surface, and the other concave-convex structures are recessed in the first reference surface, and the concave-convex structures protruding out of the first reference surface and the concave-convex structures recessed in the first reference surface are alternately arranged around the axis.

15. The projection device as claimed in claim 12 , wherein each of the concave-convex structures has a top surface and a side surface, the top surface is substantially parallel to the first reference surface or the second reference surface, and the side surface is substantially perpendicular to the top surface.

16. The projection device as claimed in claim 12 , wherein the concave-convex structures have a linear radial distribution, an arc radial distribution or irregular radial distribution relative to the axis.

17. The projection device as claimed in claim 11 , wherein each of the first disturbing portions protrudes out of the first reference surface or is recessed in the first reference surface.

18. The projection device as claimed in claim 17 , wherein a height of each of the first disturbing portions protruding out of the first reference surface is smaller than 1.5 times of a thickness of the disc, or a depth of each of the first disturbing portions recessed in the first reference surface is smaller than 1.5 times of a thickness of the disc.

19. The projection device as claimed in claim 11 , wherein each of the second disturbing portions protrudes out of the second reference surface or is recessed in the second reference surface.

20. The projection device as claimed in claim 19 , wherein a height of each of the second disturbing portions protruding out of the second reference surface is smaller than 1.5 times of a thickness of the disc, or a depth of each of the second disturbing portions recessed in the second reference surface is smaller than 1.5 times of a thickness of the disc.

21. The projection device as claimed in claim 11 , wherein the light source comprises at least one laser diode, the color wheel is a phosphor wheel, the light converting region comprises a phosphor region, and the phosphor region comprises a phosphor powder layer.

Assignees

• Coretronic Corp

Inventors

• Tsai Te-Ying
• Lin Tsung-Ching
• Wu pei-rong

Classifications

• G03B21/204

  using secondary light emission, e.g. luminescence or fluorescence (using different colours G03B33/00; if related to video signals H04N9/3197) · CPC title

• G02B26/008 Primary

  in the form of devices for effecting sequential colour changes, e.g. colour wheels · CPC title

• H04N9/3111

  for displaying the colours sequentially, e.g. by using sequentially activated light sources (sequential projection in colour photography G03B33/08) · CPC title

• H04N9/3114

  by using a sequential colour filter producing one colour at a time · CPC title

• G03B33/08

  Sequential recording or projection (G03B33/02, G03B33/04, G03B33/06 take precedence) · CPC title