WAVELENGTH CONVERSION DEVICE, ILLUMINATION DEVICE, AND PROJECTOR

• US 20190072264A1
• Filed: 10/13/2016
• Published: 03/07/2019
• Est. Priority Date: 10/16/2015
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: NAGATANI, Kaname, USUDA, Kazuya
• Granted Patent: US 10,648,653 B2
• Time in Patent Office: Days
• CPC Class Codes: F21S 2/00 Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
• CPC Class Codes: F21V 29/502 characterised by the adaptation for cooling of specific components
• CPC Class Codes: F21V 29/65 the gas flowing in a closed circuit
• CPC Class Codes: F21V 29/67 characterised by the arrangement of fans
• CPC Class Codes: F21V 29/71 using a combination of separate elements interconnected by heat-conducting means, e.g. with heat pipes or thermally conductive bars between separate heat-sink elements
• CPC Class Codes: F21V 29/76 with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
• CPC Class Codes: F21V 29/78 with helically or spirally arranged fins or blades
• CPC Class Codes: F21V 7/22 characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
• CPC Class Codes: G03B 21/16 Cooling; Preventing overheating
• 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: H04N 5/74 Projection arrangements for image reproduction, e.g. using eidophor

Abstract

A wavelength conversion device, an illumination device, and a projector that can efficiently cool a phosphor. A wavelength conversion device includes a substrate including a phosphor layer in which a phosphor is included, a rotating device configured to rotate the substrate, a circulating device that circulates a cooling gas to the substrate, and a housing configured to house the substrate and the circulating device. The housing includes a partition wall configured to separate a first space in which the cooling gas is circulated to the substrate by the circulating device and a second space in which the cooling gas radially delivered from the substrate according to the rotation of the substrate circulates.

Claims

1. A wavelength conversion device comprising:

a substrate including a phosphor layer in which a phosphor is included;

a rotating device configured to rotate the substrate;

a circulating device that circulates a cooling gas to the substrate; and

a housing configured to house the substrate and the circulating device, wherein

the housing includes a partition wall configured to separate a first space in which the cooling gas is circulated to the substrate by the circulating device and a second space in which the cooling gas radially delivered from the substrate according to the rotation of the substrate circulates.

2. The wavelength conversion device according to claim 1, wherein

the partition wall includes an opening section for circulating the cooling gas to the substrate, and

an opening shape of the opening section substantially coincides with a rotation range of the substrate.

3. The wavelength conversion device according to claim 1, wherein the substrate includes, on a surface against which the cooling gas is blown, a plurality of fins extending from a center side toward an outer side of the substrate.

9. An illumination device comprising:

the wavelength conversion device according to claim 1; and

a light source section configured to emit light made incident on the wavelength conversion device.

10. A projector comprising:

the illumination device according to claim 9;

an image forming device configured to form an image using light emitted from the illumination device; and

a projection optical device configured to project the formed image.

4. A wavelength conversion device comprising:

a substrate including a phosphor layer in which a phosphor is included;

a rotating device configured to rotate the substrate;

a circulating device configured to circulate a cooling gas to the substrate; and

a housing configured to house the substrate and the circulating device, wherein

when the substrate is viewed along a rotation axis of the substrate, in a part in a circumferential direction of the substrate, the cooling gas circulated by the circulating device circulates in an opposite direction of a rotating direction of the substrate in the part.

5. The wavelength conversion device according to claim 4, wherein, when the substrate is viewed along the rotation axis, the housing includes an arcuate section located on an outer side of the substrate and extending along a circumferential direction during the rotation of the substrate.

6. The wavelength conversion device according to claim 5, wherein

the circulating device includes a discharge port for discharging the cooling gas, and

when the substrate is viewed along the rotation axis, the discharge port is disposed to be shifted with respect to an imaginary line that passes a center of the substrate and crosses the arcuate section.

7. A wavelength conversion device comprising:

a substrate configured to rotate around a rotation axis extending along a first direction;

a plurality of fins located on a first surface, which is one surface on the substrate, and extending from a center side toward an outer side of the substrate;

a phosphor layer located in either one of the first surface and a second surface on an opposite side of the first surface;

a rotating device configured to rotate the substrate;

a delivering device configured to deliver the cooling gas to the first surface; and

a housing in which the substrate is disposed on an inner side, wherein

the housing includes;

a first side surface section opposed to the second surface; and

a second side surface section that crosses the first side surface section and includes an arcuate section extending along a circumferential direction during the rotation of the substrate disposed on the inner side when viewed along the first direction,

a radius of an arc of the arcuate section is set larger than a radius during the rotation of the substrate,

when a 12 o'"'"'clock direction among radial directions during the rotation of the substrate viewed from the first direction side is set as a second direction and either one of a 3 o'"'"'clock direction and a 9 o'"'"'clock direction viewed from the first direction side is set as a third direction, a center of the arc of the arcuate section is located on the third direction side with respect to the rotation axis, and

the substrate is rotated counterclockwise by the rotating device when viewed from the first direction side.

8. The wavelength conversion device according to claim 7, wherein

the housing includes a partition wall opposed to the first side surface section across the substrate and connected to the second side surface, and

the partition wall includes an opening section for circulating the cooling gas to the first surface.