Projector
The projector appropriately generates white light from a laser light source and uses the white light for image display. A white light generator that generates white light from blue light and yellow light includes a dichroic mirror that is irradiated with blue light from a blue laser, a first condenser lens that focuses the blue light that has passed through the dichroic mirror, a diffusion plate that diffuses the focused blue light, a second condenser lens that focuses the blue light obtained by allowing the diffused blue light to pass through the dichroic mirror, and a phosphor that is irradiated with the focused blue light to emit yellow light; the diffusion plate is an alumina ceramic plate; the dichroic mirror has a first region that transmits one of the blue light and the yellow light and reflects the other and a second region that reflects or transmits both.
1. A projector comprising:
a white light generator that uses a blue laser as a light source to generate blue light and yellow light based on the blue laser and generates white light including the generated blue light and yellow light; and
an optical system that modulates light based on the white light generated by the white light generator with an image display element and projects the modulated light,
wherein the white light generator is configured to include:
a dichroic mirror that is irradiated with the blue light from the blue laser as the light source;
a first condenser lens that focuses blue light being reflected by or passing through the dichroic mirror;
a diffusion plate that diffuses the blue light focused by the first condenser lens;
a second condenser lens that focuses the blue light passing through or being reflected by the dichroic mirror;
a phosphor that is irradiated with the blue light focused by the second condenser lens to emit yellow light,
wherein the diffusion plate is an alumina ceramic plate,
wherein the dichroic mirror has a first region having a characteristic of transmitting one of the blue light and the yellow light and reflecting the other and a second region having a characteristic of reflecting or transmitting both the blue light and the yellow light,
wherein the blue light included in the white light output by the white light generator is obtained by allowing the blue light diffused by the diffusion plate to pass through the first condenser lens and performing reflection or transmission of the dichroic mirror, and
wherein the yellow light included in the white light output by the white light generator is obtained by allowing the yellow light emitted from the phosphor to pass through the second condenser lens and performing reflection or transmission of the dichroic mirror.
2. A projector comprising:
a white light generator that uses a blue laser as a light source to generate blue light and yellow light based on the blue laser and generates white light including the generated blue light and yellow light; and
an optical system that modulates light based on the white light generated by the white light generator with an image display element and projects the modulated light,
wherein the white light generator is configured to include:
a dichroic mirror that is irradiated with the blue light from the blue laser as the light source;
a first condenser lens that focuses blue light being reflected by or passing through the dichroic mirror;
a diffusion plate that diffuses the blue light focused by the first condenser lens;
a second condenser lens that focuses the blue light passing through or being reflected by the dichroic mirror;
a phosphor that is irradiated with the blue light focused by the second condenser lens to emit yellow light,
wherein the diffusion angle θo of the outgoing light of the diffusion plate exceeds 86°,
wherein the dichroic mirror has a first region having a characteristic of transmitting one of the blue light and the yellow light and reflecting the other and a second region having a characteristic of reflecting or transmitting both the blue light and the yellow light,
wherein the blue light included in the white light output by the white light generator is obtained by allowing the blue light diffused by the diffusion plate to pass through the first condenser lens and performing reflection or transmission of the dichroic mirror, and
wherein the yellow light included in the white light output by the white light generator is obtained by allowing the yellow light emitted from the phosphor to pass through the second condenser lens and performing reflection or transmission of the dichroic mirror.
3. The projector according to claim 2 , wherein the diffusion plate is an alumina ceramic plate.
4. The projector according to claim 1 ,
wherein the dichroic mirror has a region having blue light transmission/yellow light reflection characteristics as the first region and has a region of totally reflecting characteristic as the second region,
wherein the blue light included in the white light output from the white light generator is light obtained by allowing the blue light diffused by the diffusion plate to pass through the first condenser lens, to be irradiated to the dichroic mirror, and to pass through the first region, and
wherein the yellow light included in the white light output from the white light generator is light obtained by allowing the yellow light emitted from the phosphor to pass through the second condenser lens, to be irradiated to the dichroic mirror, and to be reflected by the first region.
5. The projector according to claim 1 ,
wherein the dichroic mirror has a region having blue light reflection/yellow light transmission characteristics as the first region and has a region of totally transmitting characteristic as the second region,
wherein the blue light included in the white light output from the white light generator is light obtained by allowing the blue light diffused by the diffusion plate to pass through the first condenser lens, to be irradiated to the dichroic mirror, and to be reflected by the first region, and
wherein the yellow light included in the white light output from the white light generator is light obtained by allowing the yellow light emitted from the phosphor to pass through the second condenser lens, to be irradiated to the dichroic mirror, and to pass through the first region.
6. The projector according to claim 2 ,
wherein the dichroic mirror has a region having blue light transmission/yellow light reflection characteristics as the first region and has a region of totally reflecting characteristic as the second region,
wherein the blue light included in the white light output from the white light generator is light obtained by allowing the blue light diffused by the diffusion plate to pass through the first condenser lens, to be irradiated to the dichroic mirror, and to pass through the first region, and
wherein the yellow light included in the white light output from the white light generator is light obtained by allowing the yellow light emitted from the phosphor to pass through the second condenser lens, to be irradiated to the dichroic mirror, and to be reflected by the first region.
7. The projector according to claim 2 ,
wherein the dichroic mirror has a region having blue light reflection/yellow light transmission characteristics as the first region and has a region of totally transmitting characteristic as the second region,
wherein the blue light included in the white light output from the white light generator is light obtained by allowing the blue light diffused by the diffusion plate to pass through the first condenser lens, to be irradiated to the dichroic mirror, and to be reflected by the first region, and
wherein the yellow light included in the white light output from the white light generator is light obtained by allowing the yellow light emitted from the phosphor to pass through the second condenser lens, to be irradiated to the dichroic mirror, and to pass through the first region.
8. The projector according to claim 3 ,
wherein the dichroic mirror has a region having blue light transmission/yellow light reflection characteristics as the first region and has a region of totally reflecting characteristic as the second region,
wherein the blue light included in the white light output from the white light generator is light obtained by allowing the blue light diffused by the diffusion plate to pass through the first condenser lens, to be irradiated to the dichroic mirror, and to pass through the first region, and
wherein the yellow light included in the white light output from the white light generator is light obtained by allowing the yellow light emitted from the phosphor to pass through the second condenser lens, to be irradiated to the dichroic mirror, and to be reflected by the first region.
9. The projector according to claim 3 ,
wherein the dichroic mirror has a region having blue light reflection/yellow light transmission characteristics as the first region and has a region of totally transmitting characteristic as the second region,
wherein the blue light included in the white light output from the white light generator is light obtained by allowing the blue light diffused by the diffusion plate to pass through the first condenser lens, to be irradiated to the dichroic mirror, and to be reflected by the first region, and
wherein the yellow light included in the white light output from the white light generator is light obtained by allowing the yellow light emitted from the phosphor to pass through the second condenser lens, to be irradiated to the dichroic mirror, and to pass through the first region.