Light source device and projector
A light source device of the invention includes an excitation light source, a wavelength conversion layer having a light incident surface and a light exiting surface, a reflection member, and a pickup system, wherein the light exiting surface at least has a first light exiting surface with a tilt with respect to an optical axis of the pickup system and a second light exiting surface with a tilt with respect to the first light exiting surface, the reflection member has a reflection surface along the optical axis of the pickup system and an end portion on the pickup system side extends closer to the pickup system than the light exiting surface, and a focal point of the pickup system is formed on a plane crossing the optical axis of the pickup system and containing the end portion of the reflection member.
1. A light source device comprising:
an excitation light source that outputs an excitation light;
a wavelength conversion layer having a light incident surface into which the excitation light enters and a light exiting surface that at least outputs a fluorescent light formed by wavelength conversion of the excitation light;
a reflection member that reflects the light output from the light exiting surface; and
a pickup system that parallelizes the fluorescent light output from the wavelength conversion layer, wherein:
the light exiting surface at least has a first light exiting surface with a tilt with respect to an optical axis of the pickup system and a second light exiting surface with a tilt with respect to the first light exiting surface,
the reflection member has a reflection surface along the optical axis of the pickup system and an end portion of the reflection member on the pickup system side extends closer to the pickup system than the first light exiting surface and the second light exiting surface,
a focal point of the pickup system is formed on a plane that (i) crosses the optical axis of the pickup system, (ii) contains the end portion of the reflection member, and (iii) is perpendicular to the optical axis,
the wavelength conversion layer has a third light exiting surface with a tilt with respect to at least one of the first light exiting surface and the second light exiting surface, and
the third light exiting surface crosses the optical axis of the pickup system, faces the light incident surface, and coincides with the plane containing the end portion of the reflection member.
2. The light source device according to claim 1 , wherein:
a heat dissipation member is provided on an opposite side of the reflection member to the wavelength conversion layer in a direction crossing the optical axis of the pickup system,
the wavelength conversion layer has a connecting surface connecting the light incident surface and the light exiting surface, and
at least a part of the reflection surface of the reflection member is provided in contact with the connecting surface.
3. A projector comprising:
the light source device according to claim 2 ;
a light modulation device that modulates a light output from the light source device according to image information and generates an image light; and
a projection system that projects the image light.
4. The light source device according to claim 1 , further comprising a light-transmissive member in contact with the light incident surface between the excitation light source and the wavelength conversion layer,
wherein the light-transmissive member includes a convex surface that projects in a direction opposite to a traveling direction of the excitation light from the excitation light source.
5. A projector comprising:
the light source device according to claim 4 ;
a light modulation device that modulates a light output from the light source device according to image information and generates an image light; and
a projection system that projects the image light.
6. The light source device according to claim 4 , wherein a dichroic film is provided on the light incident surface of the wavelength conversion layer.
7. The light source device according to claim 1 , wherein one of the first light exiting surface and the second light exiting surface crosses the optical axis.
8. The light source device according to claim 7 , wherein the other of the first light exiting surface and the second light exiting surface is along the optical axis.
9. A projector comprising:
the light source device according to claim 8 ;
a light modulation device that modulates a light output from the light source device according to image information and generates an image light; and
a projection system that projects the image light.
10. A projector comprising:
the light source device according to claim 7 ;
a light modulation device that modulates a light output from the light source device according to image information and generates an image light; and
a projection system that projects the image light.
11. A projector comprising:
the light source device according to claim 1 ;
a light modulation device that modulates a light output from the light source device according to image information and generates an image light; and
a projection system that projects the image light.
12. The light source device according to claim 1 , wherein the reflection surface of the reflection member is parallel to the optical axis of the pickup system.
13. The light source device according to claim 1 , wherein the focal point of the pickup system is located closer to the pickup system than the light incident surface of the wavelength conversion layer.
14. The light source device according to claim 13 , wherein the focal point of the pickup system is located farther from the excitation light source than the light incident surface of the wavelength conversion layer.
15. The light source device according to claim 1 , wherein the focal point of the pickup system is located farther from the excitation light source than the light incident surface of the wavelength conversion layer.