Phosphor wheel and projection image display device
View Patent ↗A phosphor wheel includes a substrate that has a disk shape, and includes a first main surface, a second main surface opposite to the first main surface, and an opening. A phosphor layer has a curved shape and is provided along a circumferential direction of the substrate on the first main surface, and the phosphor layer is provided side by side with the opening in the circumferential direction in plan view. A heat dissipation fin is provided on the second main surface, and a projection is provided on the second main surface, and is different from the heat dissipation fin. The heat dissipation fin and the projection are disposed integrally with the substrate.
1 . A phosphor wheel comprising:
a disk-shaped substrate including a first main surface, a second main surface opposite to the first main surface, and an opening;
a phosphor layer having a curved shape and provided on the first main surface along a circumferential direction of the substrate, the phosphor layer being arranged side by side with the opening in the circumferential direction in plan view;
a heat dissipation fin on the second main surface; and
a projection on the second main surface, the projection being different from the heat dissipation fin, wherein the projection is located at a position where an imbalance of a mass distribution of the phosphor wheel caused by the opening is reduced.
2 . The phosphor wheel according to claim 1 , wherein the projection is located in a region of the second main surface, the region being an outer peripheral side with respect to the opening.
3 . The phosphor wheel according to claim 1 , wherein the projection is arranged side by side with the opening in a radial direction of the disk-shaped substrate.
4 . The phosphor wheel according to claim 1 , wherein the projection is arranged along the circumferential direction, and has a curved shape.
5 . The phosphor wheel according to claim 1 , wherein a plurality of the projections are provided along the circumferential direction of the disk-shaped substrate.
6 . The phosphor wheel according to claim 5 , wherein each of the plurality of projections has a dot shape.
7 . The phosphor wheel according to claim 1 , wherein a height of the projection is equal to a height of the heat dissipation fin.
8 . The phosphor wheel according to claim 1 , wherein the heat dissipation fin and the projection are disposed integrally with the disk-shaped substrate.
9 . The phosphor wheel according to claim 1 , wherein a residual imbalance of the phosphor wheel is less than or equal to an allowable residual imbalance.
10 . The phosphor wheel according to claim 1 , wherein a region of the second main surface near the opening is flat.
11 . The phosphor wheel according to claim 1 , wherein the heat dissipation fin and the projection are formed by cutting.
12 . The phosphor wheel according to claim 1 , wherein;
the opening has a curved shape, and
the opening and the phosphor layer form a ring shape in plan view.
13 . A projection image display device comprising:
the phosphor wheel according to claim 1 ;
a motor configured to rotate the phosphor wheel;
a laser light source configured to irradiate the phosphor layer of the phosphor wheel with laser light;
an image display element configured to modulate light emitted from the phosphor layer of the phosphor wheel in accordance with laser light emitted by the laser light source based on an image signal; and
a projection lens configured to project the light modulated by the image display element.
14 . The phosphor wheel according to claim 1 , wherein:
the opening of the disk-shaped substrate is one of a plurality of openings of the disk-shaped substrate, and
an imbalance of a mass distribution of the phosphor wheel is reduced by providing one projection for the plurality of openings.
15 . A phosphor wheel comprising:
a disk-shaped substrate including a first main surface, a second main surface opposite to the first main surface, and an opening;
a phosphor layer having a curved shape and provided on the first main surface along a circumferential direction of the disk-shaped substrate, the phosphor layer being arranged side by side with the opening in the circumferential direction in plan view;
a heat dissipation fin on the second main surface; and
a projection on the second main surface, the projection being different from the heat dissipation fin, and the heat dissipation fin and the projection being disposed integrally with the disk-shaped substrate,
wherein the opening of the disk-shaped substrate is one of a plurality of openings of the disk-shaped substrate, and
wherein an imbalance of a mass distribution of the phosphor wheel is reduced by providing one projection for the plurality of openings.