Light source apparatus and image display apparatus
A light source apparatus according to an embodiment of the present technique includes a first light source section, a second light source section, a third light source section, and a synthesis section. The first light source section includes a plurality of red laser light sources arranged in an array. The second light source section includes a plurality of green laser light sources arranged in an array. The third light source section includes a plurality of blue laser light sources arranged in an array. The synthesis section synthesizes red laser light emitted from the first light source section, green laser light emitted from the second light source section, and blue laser light emitted from the third light source section to generate white light.
1. A light source apparatus, comprising:
a first light source section including a plurality of red laser light sources arranged in an array;
a second light source section including a plurality of green laser light sources arranged in an array;
a third light source section including a plurality of blue laser light sources arranged in an array; and
a synthesis section that synthesizes red laser light emitted from the first light source section, green laser light emitted from the second light source section, and blue laser light emitted from the third light source section to generate white light,
wherein:
the first light source section includes a first collective lens that collects the red laser light emitted from the plurality of red laser light sources;
the second light source section includes a second collective lens that collects the green laser light emitted from the plurality of green laser light sources;
the third light source section includes a third collective lens that collects the blue laser light emitted from the plurality of blue laser light sources; and
F numbers of the first collective lens, the second collective lens, and the third collective lens are selected such that the red laser light, the green laser light and the blue laser light are collected at substantially a same position.
2. The light source apparatus according to claim 1 , further comprising
a diffuser that receives and diffuses the white light generated by the synthesis section.
3. The light source apparatus according to claim 1 , wherein:
in the first light source section, the second light source section, and the third light source section, the plurality of laser light sources of the respective colors are arranged such that polarization directions of laser light to be emitted are aligned in one direction; and
the first light source section, the second light source section, and the third light source section respectively emit the red laser light, the green laser light, and the blue laser light that have the same polarization direction to the synthesis section.
4. The light source apparatus according to claim 3 , wherein:
the plurality of laser light sources of the respective colors are arranged in a first direction as a reference of the polarization direction of laser light to be emitted and a second direction orthogonal to the first direction;
the plurality of red laser light sources are arranged such that a fast axis direction of the red laser light to be emitted becomes parallel to the first direction; and
the plurality of green laser light sources and the plurality of blue laser light sources are arranged such that a slow axis direction of each of the green laser light and blue laser light to be emitted becomes parallel to the first direction.
5. The light source apparatus according to claim 4 , wherein:
each of the first light source section, the second light source section, and the third light source section includes a lens optical system capable of controlling a divergence angle of laser light emitted from the plurality of laser light sources of the respective colors in the fast axis direction and a divergence angle thereof in the slow axis direction;
the lens optical system of the first light source section is arranged while opposing the plurality of red laser light sources with a predetermined direction as a reference; and
the lens optical systems of the second light source section and the third light source section are arranged while respectively opposing the plurality of green laser light sources and the plurality of blue laser light sources with a direction orthogonal to the predetermined direction as a reference.
6. The light source apparatus according to claim 5 ,
wherein the lens optical system of each of the first light source section, the second light source section, and the third light source section includes a first lens section that controls the divergence angle of laser light emitted from the plurality of laser light sources of the respective colors in the fast axis direction, and a second lens section that controls the divergence angle of the laser light in the slow axis direction.
7. The light source apparatus according to claim 1 , wherein:
the first light source section includes a first collective lens that collects the red laser light emitted from the plurality of red laser light sources;
the second light source section includes a second collective lens that collects the green laser light emitted from the plurality of green laser light sources;
the third light source section includes a third collective lens that collects the blue laser light emitted from the plurality of blue laser light sources; and
F numbers of the first collective lens, the second collective lens, and the third collective lens satisfy the following expression
0.8 FNoG<FNoR, FNoB< 1.2 FNoG
FNoR: F number of first collective lens
FNoG: F number of second collective lens
FNoB: F number of third collective lens.
8. The light source apparatus according to claim 7 ,
wherein the F numbers of the first collective lens, the second collective lens, and the third collective lens are the same.
9. An image display apparatus, comprising:
(a) a light source apparatus including
a first light source section including a plurality of red laser light sources arranged in an array,
a second light source section including a plurality of green laser light sources arranged in an array,
a third light source section including a plurality of blue laser light sources arranged in an array, and
a synthesis section that synthesizes red laser light emitted from the first light source section, green laser light emitted from the second light source section, and blue laser light emitted from the third light source section to generate white light;
(b) an image generation system including
an image generation device that generates an image based on irradiated light, and
an illumination optical system that irradiates the white light emitted from the light source apparatus onto the image generation device; and
(c) a projection system that projects the image generated by the image generation device,
wherein:
the first light source section includes a first collective lens that collects the red laser light emitted from the plurality of red laser light sources;
the second light source section includes a second collective lens that collects the green laser light emitted from the plurality of green laser light sources;
the third light source section includes a third collective lens that collects the blue laser light emitted from the plurality of blue laser light sources; and
F numbers of the first collective lens, the second collective lens, and the third collective lens are selected such that the red laser light, the green laser light and the blue laser light are collected at substantially a same position.