Wavelength conversion device, phosphor wheel, light source device, projection display apparatus, and method for manufacturing wavelength conversion device

1 . A wavelength conversion device comprising:

a wavelength conversion element that generates, from first light incident on the wavelength conversion element, second light having a wavelength different from a wavelength of the first light and third light having a wavelength different from the wavelength of the first light and the wavelength of the second light; and

a substrate on which the wavelength conversion element is disposed,

wherein the wavelength conversion element includes a plurality of wavelength converters arranged adjacent to each other in a first direction intersecting an incident direction in which the first light is incident,

each of the plurality of wavelength converters includes:

a first phosphor layer that converts the first light into fluorescent light that is the second light; and

a second phosphor layer that converts the first light into fluorescent light that is the third light,

the first phosphor layer and the second phosphor layer are arranged adjacent to each other such that the plurality of first phosphor layers and the plurality of second phosphor layers included in the plurality of wavelength converters are alternately arranged in the first direction,

the first direction is a direction along a surface of the substrate,

the plurality of wavelength converters are disposed at an arbitrary first position in a circumferential direction of the substrate and an arbitrary second position different from the first position, and

between a first point that is a midpoint in a radial direction of the substrate in the plurality of wavelength converters arranged at the first position and a second point that is a midpoint in the radial direction of the substrate in the plurality of wavelength converters at the second position, a distance between a rotation center of the substrate and the first point and a distance between the rotation center of the substrate and the second point are different.

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

a width of the first phosphor layer in the first direction is longer than a height of the first phosphor layer in the incident direction, and

a width of the second phosphor layer in the first direction is longer than a height of the second phosphor layer in the incident direction.

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

the substrate has a disk shape,

the plurality of wavelength converters are disposed adjacent to each other in a radial direction of the substrate, and

the first phosphor layers and the second phosphor layers are disposed adjacent to each other such that the plurality of first phosphor layers and the plurality of second phosphor layers are alternately arranged in the radial direction of the substrate.

4 . The wavelength conversion device according to claim 3 , wherein

the substrate includes an opening, and

the plurality of first phosphor layers, the plurality of second phosphor layers, and the opening are configured into an annular shape.

5 . A phosphor wheel comprising:

the wavelength conversion device according to claim 3 , and

a motor that rotationally drives the substrate.

6 . A light source device comprising:

the phosphor wheel according to claim 5 , and

a light source that emits laser light as the first light, wherein

a width of a spot of the first light incident on the wavelength conversion device from the light source in the radial direction is equal to an integral multiple of a width of each of the plurality of wavelength converters in the radial direction.

7 . The light source device according to claim 6 , wherein

the light source emits blue laser light as the first light, and

the first phosphor layer receives the first light and emits yellow light.

8 . The light source device according to claim 6 , wherein

the light source emits the blue laser light as the first light, and

the first phosphor layer receives the first light and emits red light.

9 . The light source device according to claim 6 , wherein

the light source emits the blue laser light as the first light, and

the second phosphor layers receive the first light and emits green light.

10 . A projection display apparatus comprising:

the light source device according to claim 6 ;

a light modulator that generates image light by using the second light and the third light emitted from the light source device; and

a projection optical system that projects the image light.

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

a width of the first phosphor layer is equal to a width of the second phosphor layer.

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

the plurality of wavelength converters includes 12 or more wavelength converters.

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

the plurality of first phosphor layers form a spiral shape, and

the plurality of second phosphor layers form a spiral shape.

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

the first phosphor layer has a linear shape, and

the second phosphor layer has a linear shape.

15 . A light source device comprising:

a phosphor wheel including a wavelength conversion device and a motor; and

a light source that emits laser light as a first light,

wherein the wavelength conversion device includes:

a wavelength conversion element that generates, from the first light incident on the wavelength conversion element, second light having a wavelength different from a wavelength of the first light and third light having a wavelength different from the wavelength of the first light and the wavelength of the second light; and

a substrate on which the wavelength conversion element is disposed,

wherein the motor rotationally drives the substrate,

wherein the wavelength conversion element includes a plurality of wavelength converters arranged adjacent to each other in a first direction intersecting an incident direction in which the first light is incident,

each of the plurality of wavelength converters includes:

a first phosphor layer that converts the first light into fluorescent light that is the second light; and

a second phosphor layer that converts the first light into fluorescent light that is the third light,

wherein the first phosphor layer and the second phosphor layer are arranged adjacent to each other such that the plurality of first phosphor layers and the plurality of second phosphor layers included in the plurality of wavelength converters are alternately arranged in the first direction,

the first direction is a direction along a surface of the substrate,

the substrate has a disk shape,

the plurality of wavelength converters are disposed adjacent to each other in a radial direction of the substrate,

the first phosphor layers and the second phosphor layers are disposed adjacent to each other such that the plurality of first phosphor layers and the plurality of second phosphor layers are alternately arranged in the radial direction of the substrate, and

a width of a spot of the first light incident on the wavelength conversion device from the light source in the radial direction is equal to an integral multiple of a width of each of the plurality of wavelength converters in the radial direction.

16 . The light source device according to claim 15 , wherein

the light source emits blue laser light as the first light, and

the first phosphor layer receives the first light and emits yellow light.

17 . The light source device according to claim 15 , wherein

the light source emits the blue laser light as the first light, and

the first phosphor layer receives the first light and emits red light.

18 . The light source device according to claim 15 , wherein

the light source emits the blue laser light as the first light, and

the second phosphor layers receive the first light and emits green light.