Light source apparatus

• US 20050151937A1
• Filed: 12/30/2004
• Published: 07/14/2005
• Est. Priority Date: 01/09/2004
• Status: Abandoned Application

• Current Assignee: Ushio Denki Kabushiki Kaisha
• Original Assignee: Ushio Denki Kabushiki Kaisha
• Inventors: Sugitani, Akihiko
• Application Number:
  US11/024,768
• Publication Number:
  US 20050151937A1
• Time in Patent Office: Days
• US Class Current: 353/85
• CPC Class Codes: G03B 21/2026 Gas discharge type light sources, e.g. arcs
• CPC Class Codes: G03B 21/2053 Intensity control of illuminating light controlled by video signal processing H04N5/74 or H04N9/31
• CPC Class Codes: G03B 21/208 Homogenising, shaping of the illumination light
• CPC Class Codes: H04N 9/3114 by using a sequential colour filter producing one colour at a time
• 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

It is an object of the present invention to provide a light source apparatus having a rotation filter, in which brightness of an image and/or color reproducibility of RGB is improved, and miniaturization and simplification is attained. A light source apparatus comprising a rotation filter having a light condensing area, in which at least a first color area and a second color area are formed, a lens to which light passing through the light condensing area is incident, an image display device receiving light emitted from the rod integrator lens, a discharge lamp; and a power supply controlling apparatus which controls power supply to the discharge lamp, wherein the power supply controlling apparatus shuts off or reduces current applied to the discharge lamp when a boundary between the first color area and the second color area is located at a position corresponding to the light condensing area.

Claims

1. A light source apparatus for a projector having a rotation filter in which at least RGB color areas are formed, a rod integrator lens to which light passing through a light condensing area on the rotation filter is incident, and an image display device receiving light emitted from the rod integrator lens, the light source comprising:

a high pressure discharge lamp containing 0.16 mg/mm³ mercury;

a power supply controlling apparatus for the high pressure discharge lamp;

wherein the power supply controlling apparatus shuts off or reduces current to the discharge lamp when a boundary between a first color area and a second color area is located at a position corresponding to the light condensing area.

2. The light source apparatus according to claim 1, wherein time for shutting off or reducing current applied to the discharge lamp is 4 milliseconds or less.

3. The light source apparatus according to claim 1, wherein 0.16 mg/mm³ of mercury is filled in the discharge lamp.

15. The light source apparatus according to claim 3, further including a filter driving mechanism which sends a signal to the power supply controlling apparatus when a boundary between the first color area and the second color area is located at a position corresponding to the light condensing area, wherein the power controlling apparatus shuts off or reduces the current to the discharge lamp based on the signal.

4. A light source apparatus comprising:

a rotation filter having a light condensing area, in which at least a first color area and a second color area are formed;

a lens to which light passing through the light condensing area is incident;

an image display device receiving light emitted from the rod integrator lens;

a discharge lamp; and

a power supply controlling apparatus which controls power supply to the discharge lamp,

wherein the power supply controlling apparatus shuts off or reduces current applied to the discharge lamp when a boundary between the first color area and the second color area is located at a position corresponding to the light condensing area.

5. The light source apparatus according to claim 4, wherein the rotation filter has the first color area, the second color area and a third color area.

6. The light source apparatus according to claim 5, wherein the rotation filter has the first color area, the second color area, a third color area, and a forth color area.

7. The light source apparatus according to claim 4, wherein the forth color area is a white area.

8. The light source apparatus according to claim 7, wherein the first color area is a green area, the second color area is a red area, and the third color area is a blue area.

9. The light source apparatus according to claim 8, wherein the green, red, blue and white areas have a lemon wedge, respectively.

10. The light source apparatus according to claim 9, wherein the green area has a 103 degree center angle, the red area has a 77 degree center angle, the blue area has a 97 degree center angle and the white area has a 83 degree angle.

11. The light source apparatus according to claim 4, wherein the light condensing area has a rectangular shape.

12. The light source apparatus according to claim 4, wherein the lens is a rod integrator lens.

13. The light source apparatus according to claim 4, wherein the image display device is a digital micromirror device.

14. The light source apparatus according to claim 4, wherein the discharge lamp is a high pressure mercury lamp.