ILLUMINATION SYSTEM

Abstract

An illumination system having a light source, an integration rod and a color wheel is provided. The light source is suitable for providing a light beam. The light integration rod and the color wheel are disposed on the transmission path of the light beam. The color wheel is disposed between the light source and the light integration rod. The light integration rod has a light input end adjacent to the color wheel and a light output end on the opposite side of the light input end. The light integration rod has two indentations at the light input end to form an airflow channel. The noise caused by the rotating color wheel is reduced through the airflow channel.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

FIG. 1 is a schematic cross-sectional view showing a conventional color wheel and a conventional light integration rod.

FIG. 2 is a perspective view of the conventional light integration rod in FIG. 2.

FIG. 3 is a schematic cross-sectional view of an illumination system according to a first embodiment of the present invention.

FIG. 4 is a perspective view of the light integration rod in FIG. 3.

FIG. 5 is a perspective view showing the airflow direction between the color wheel and the light integration rod in FIG. 3.

FIG. 6 is a schematic cross-sectional view illustrating the assembling of the color wheel in FIG. 3.

FIG. 7A is a perspective view of a light integration rod according to a second embodiment of the present invention.

FIG. 7B is a perspective view showing the airflow direction between the color wheel and the light integration rod in FIG. 7A.

FIG. 8A is a perspective view of a light integration rod according to a third embodiment of the present invention.

FIG. 8B is a top view of the light integration rod in FIG. 8A.

FIG. 8C is a top view of a first panel and a second panel of the light integration rod in FIG. 8A.

FIGS. 8D and 8E are perspective views showing the airflow directions between the color wheel and the light integration rod in FIG. 8A.

FIG. 9 is a perspective view of a light integration rod according to a forth embodiment of the present invention.

Claims

1. An illumination system, comprising: a light source suitable for providing a light beam;a light integration rod disposed on a transmission path of the light beam, the light integration rod having a light input end and a light output end on the opposite side thereof, and the light input end of the light integration rod having two indentations, the two indentations forming an airflow channel; anda color wheel disposed between the light source and the light integration rod on the transmission path of the light beam, the light input end of the light integration rod being adjacent to the color wheel.

2. The illumination system of claim 1, wherein the light integration rod comprises a pair of opposing panels including a first panel and a second panel and another pair of opposing panels including a third panel and a fourth panel, and the third panel and the fourth panel are connected between the first panel and the second panel, and the light input end of the first panel and the second panel retreat inward between the third panel and the fourth panel to form the indentations.

3. The illumination system of claim 2, wherein a width of the first panel is the same as a width of the second panel, a width of the third panel is the same as a width of the fourth panel, and the width of the first panel is smaller than the width of the third panel.

4. The illumination system of claim 2, wherein a width of the first panel is the same as a width of the second panel, a width of the third panel is the same as a width of the fourth panel, and the width of the first panel is greater than the width of the third panel.

5. The illumination system of claim 1, wherein the color wheel includes: a motor; anda plurality of filters mounted on the motor, the light output surfaces of the filters being disposed on a same surface.

6. An illumination system, comprising: a light source suitable for providing a light beam;a light integration rod disposed on a transmission path of the light beam, the light integration rod having a light input end and a light output end on the opposite side, and a normal vector to an optical cut surface at the light input end being not in parallel to an optical axis of the light integration rod; anda color wheel disposed between the light source and the light integration rod on the transmission path of the light beam, the light input end of the light integration rod being adjacent to the color wheel.

7. The illumination system of claim 6, wherein the light integration rod comprises a pair of opposing panel including a first panel and a second panel and another pair of opposing panel including a third panel and a fourth panel, and the third panel and the fourth panel are connected between the first panel and the second panel, and a normal vector to the surface at the light input end of the first panel and a normal vector to the surface at the light input end of the second panel are parallel to the normal vector to the optical cut surface at the light input end.

8. The illumination system of claim 7, wherein a width of the first panel is the same as a width of the second panel, a width of the third panel is the same as a width of the fourth panel, and the width of the first panel is smaller than the width of the third panel.

9. The illumination system of claim 7, wherein a width of the first panel is the same as a width of the second panel, a width of the third panel is the same as a width of the fourth panel, and the width of the first panel is greater than the width of the third panel.

10. The illumination system of claim 6, wherein the color wheel includes: a motor;a plurality of filters mounted on the motor, the light output surfaces of the filters being disposed on a same surface.

11. An illumination system, comprising: a light source suitable for providing a light beam;a light integration rod disposed on a transmission path of the light beam;a color wheel disposed between the light source and the light integration rod on the transmission path of the light beam, and the color wheel includes: a motor; anda plurality of filters mounted on the motor, the light output surfaces of the filters being disposed on a same surface.