Wavelength conversion device, illumination device, and projector

Patent metadata

Field	Value
Publication number	US-10648653-B2
Application number	US-201615767128-A
Country	US
Kind code	B2
Filing date	Oct 13, 2016
Priority date	Oct 16, 2015
Publication date	May 12, 2020
Grant date	May 12, 2020

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.

First claim

What is claimed is:

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 about a rotation axis;
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 substrate is disposed,
the partition wall includes an opening section for circulating the cooling gas to the substrate,
the rotation axis extends through the opening section of the partition wall, and
the cooling gas is radially delivered to the second space from the first space by the rotation of the substrate.

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

4. The wavelength conversion device according to claim 1 , wherein when the substrate is viewed along the 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. 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.

6. 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.

7. The wavelength conversion device according to claim 6 , 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.

8. A projector comprising:
the illumination device according to claim 5 ;
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.

9. 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 from a center of an arc of the arcuate section is larger than a radius of the substrate,
the center of the arc of the arcuate section is located spaced apart from a rotation axis of the substrate, and
the substrate is rotated counterclockwise by the rotating device when viewed from the first direction side.

10. The wavelength conversion device according to claim 9 , 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.

Assignees

• Seiko Epson Corp

Inventors

• Nagatani Kaname
• Usuda Kazuya

Classifications

• F21V29/71

  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 title

• F21V29/78

  with helically or spirally arranged fins or blades · CPC title

• F21V7/22 Primary

  characterised by materials, surface treatments or coatings, e.g. dichroic reflectors · CPC title

• H04N5/74

  Projection arrangements for image reproduction, e.g. using eidophor · CPC title

• F21V29/76

  with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section · CPC title