Wavelength-converting wheel, illumination system, and projection apparatus

• US 10,585,276 B2
• Filed: 03/22/2019
• Issued: 03/10/2020
• Est. Priority Date: 05/24/2018
• Status: Active Grant

• Current Assignee: Coretronic Corporation
• Original Assignee: Coretronic Corporation
• Inventors: Hsieh, Chi-Tang, Hsu, Jo-Han, Tsai, Chia-Lun, Chang, Hsin-Yueh
• Primary Examiner(s): Dowling, William C.
• Application Number:
  US16/361,239
• Publication Number:
  US 20190361221A1
• Time in Patent Office: 354 Days
• CPC Class Codes: F21S 10/007 using rotating transparent or colored disks, e.g. gobo wheels
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 7/30 the coatings comprising photoluminescent substances
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: F21Y 2115/30 Semiconductor lasers
• CPC Class Codes: G02B 26/008 in the form of devices for effecting sequential colour changes, e.g. colour wheels
• CPC Class Codes: G03B 21/2033 LED or laser light sources
• CPC Class Codes: G03B 21/204 using secondary light emission, e.g. luminescence or fluorescence using different colours G03B33/00; if related to video signals H04N9/3197
• CPC Class Codes: G03B 21/2066 Reflectors in illumination beam in projection beam G03B21/28
• CPC Class Codes: H04N 9/3144 Cooling systems cooling of liquid crystal cells in general G02F1/133382; cooling of projectors not peculiar to the presence of an electronic spatial light modulator G03B21/16
• CPC Class Codes: H04N 9/3158 for controlling the spectrum
• CPC Class Codes: H04N 9/3161 using laser light sources using laser beams scanning the display screen H04N9/3129

Abstract

A wavelength-converting wheel, for converting an excitation beam having an output power greater than or equal to 100 W into a conversion beam, is provided. The wavelength-converting wheel includes a turntable having an annular irradiation portion, an adhesive layer disposed at the annular irradiation portion, a reflective layer disposed on the adhesive layer, and a wavelength-converting layer. The wavelength-converting layer is disposed on the reflective layer and has a light receiving surface configured to be irradiated by the excitation beam. The invention further provides an illumination system including the wavelength-converting wheel, and a projection apparatus including the illumination system. The heat dissipating ability of the wavelength-converting wheel is improved. The material of the wavelength-converting layer is not deteriorated or damaged due to the heat of the excitation beam. The wavelength-converting layer has improved wavelength conversion efficiency and can effectively convert a high output power excitation beam into a conversion beam.

Claims

1. A wavelength-converting wheel, configured to convert an excitation beam having an output power greater than or equal to 100 W into a conversion beam, wherein the wavelength-converting wheel comprises:

a turntable, having an annular irradiation portion;

an adhesive layer, disposed at the annular irradiation portion;

a reflective layer, disposed on the adhesive layer; and

a wavelength-converting layer, disposed on the reflective layer and having a light receiving surface, wherein the light receiving surface is configured to be irradiated by the excitation beam, and a maximum thickness of the wavelength-converting layer is less than or equal to 0.1 mm.

2. The wavelength-converting wheel according to claim 1, wherein the light receiving surface has an inside portion, a central portion, and an outside portion, the inside portion, the central portion, and the outside portion are arranged in sequence along a radial direction of the turntable, a thickness of the wavelength-converting layer at the inside portion is greater than a thickness of the wavelength-converting layer at the central portion, and a thickness of the wavelength-converting layer at the outside portion is greater than the thickness of the wavelength-converting layer at the central portion.

3. The wavelength-converting wheel according to claim 2, wherein thicknesses of the wavelength-converting layer increase gradually from the central portion toward the inside portion and the outside portion.

4. The wavelength-converting wheel according to claim 3, wherein the light receiving surface comprises two stair portions, each of the two stair portions has a lower edge, an upper edge opposite to the lower edge, and at least one step surface disposed between the lower edge and the upper edge, a level height of the upper edge is higher than a level height of the lower edge, the lower edges of the two stair portions are connected at the central portion, and the upper edges of the two stair portions are adjacent to the inside portion and the outside portion respectively.

5. The wavelength-converting wheel according to claim 1, wherein the reflective layer comprises scattering particles, and a thickness of the reflective layer is greater than 0.1 mm.

6. The wavelength-converting wheel according to claim 1, wherein a heat conductivity of the adhesive layer is greater than 0.1 Wm⁻

1k<sup>−

1</sup>.

7. An illumination system, configured to provide an illuminating beam, wherein the illumination system comprises:

an excitation light source, configured to provide an excitation beam having an output power greater than or equal to 100 W; and

a wavelength-converting wheel, disposed on a transmission path of the excitation beam and configured to covert the excitation beam into a conversion beam, wherein the wavelength-converting wheel comprises;

a turntable, having an annular irradiation portion;

an adhesive layer, disposed at the annular irradiation portion;

a reflective layer, disposed on the adhesive layer; and

a wavelength-converting layer, disposed on the reflective layer and having a light receiving surface, wherein the light receiving surface is configured to be irradiated by the excitation beam, a maximum thickness of the wavelength-converting layer is less than or equal to 0.1 mm, and the illuminating beam comprises the conversion beam.

8. The illumination system according to claim 7, wherein the light receiving surface has an inside portion, a central portion, and an outside portion, the inside portion, the central portion, and the outside portion are arranged in sequence along a radial direction of the turntable, a thickness of the wavelength-converting layer at the inside portion is greater than a thickness of the wavelength-converting layer at the central portion, and a thickness of the wavelength-converting layer at the outside portion is greater than the thickness of the wavelength-converting layer at the central portion.

9. The illumination system according to claim 8, wherein thicknesses of the wavelength-converting layer increase gradually from the central portion toward the inside portion and the outside portion.

10. The illumination system according to claim 9, wherein the light receiving surface comprises two stair portions, each of the two stair portions has a lower edge, an upper edge opposite to the lower edge, and at least one step surface disposed between the lower edge and the upper edge, a level height of the upper edge is higher than a level height of the lower edge, the lower edges of the two stair portions are connected at the central portion, and the upper edges of the two stair portions are adjacent to the inside portion and the outside portion respectively.

11. The illumination system according to claim 7, wherein the reflective layer comprises scattering particles, and a thickness of the reflective layer is greater than 0.1 mm.

12. The illumination system according to claim 7, wherein a heat conductivity of the adhesive layer is greater than 0.1 Wm⁻

1k<sup>−

1</sup>.

13. A projection apparatus, comprising:

an illumination system, configured to provide an illuminating beam and comprising;

an excitation light source, configured to provide an excitation beam having an output power greater than or equal to 100 W; and

a wavelength-converting wheel, disposed on a transmission path of the excitation beam and configured to convert the excitation beam into a conversion beam, wherein the wavelength-converting wheel comprises;

a turntable, having an annular irradiation portion;

an adhesive layer, disposed at the annular irradiation portion;

a reflective layer, disposed on the adhesive layer; and

a wavelength-converting layer, disposed on the reflective layer and having a light receiving surface, wherein the light receiving surface is configured to be irradiated by the excitation beam, a maximum thickness of the wavelength-converting layer is less than or equal to 0.1 mm, and the illuminating beam comprises the conversion beam;

a light valve, disposed on a transmission path of the illuminating beam to convert the illuminating beam into an image beam; and

a projection lens, disposed on a transmission path of the image beam.