Lighting apparatus and projection-type image display apparatus
View Patent ↗A lighting apparatus includes: a light source generating a first color component light; a separation element partially transmitting the first color component light, partially reflecting the first color component light, and transmitting a second color component light different from the first color component light at a certain moment; an illuminant excited by the first color component light transmitted through the separation element to generate the second color component light; and an optical system combining the first color component light made incident on the separation element from the light source and reflected by the separation element with the second color component light made incident on the separation element from the illuminant and transmitted through the separation element. The separation element is configured to have variable transmittance and reflectance with respect to the first color component light.
1. A lighting apparatus comprising:
a light source generating a first color component light;
a separation element configured to partially transmit the first color component light, partially reflect the first color component light, and transmit a second color component light different from the first color component light at a certain moment;
an illuminant excited by the first color component light transmitted through the separation element to generate the second color component light; and
an optical system configured to combine the first color component light made incident on the separation element from the light source and reflected by the separation element with the second color component light made incident on the separation element from the illuminant and transmitted through the separation element, wherein
the separation element is configured to have variable transmittance and reflectance with respect to the first color component light,
the first color component light generated by the light source is linearly polarized,
the separation element includes a dichroic mirror including a first region reflecting the first color component light and transmitting the second color component light and a second region transmitting the first and second color component lights, wherein the second region is disposed inside the first region and has a size smaller than a spot size of the first color component light incident on the dichroic mirror from the light source, and
the dichroic mirror is configured to be movable for switching whether or not the first color component light is incident on the second region.
2. The lighting apparatus according to claim 1 , wherein the first color component light is a blue light, and the second color component light is a color component light including a green range.
3. The lighting apparatus according to claim 2 , wherein the separation element reflects a color component light having a wavelength longer than a wavelength in the green range of the second color component light.
4. The lighting apparatus according to claim 1 , wherein the light source is a solid-state light source element.
5. A projection-type image display apparatus comprising:
the lighting apparatus according to claim 1 .
6. A lighting apparatus comprising:
a light source generating a first color component light;
a separation element configured to partially transmit the first color component light, partially reflect the first color component light, and transmit a second color component light different from the first color component light at a certain moment;
an illuminant excited by the first color component light transmitted through the separation element to generate the second color component light; and
an optical system configured to combine the first color component light made incident on the separation element from the light source and reflected by the separation element with the second color component light made incident on the separation element from the illuminant and transmitted through the separation element, wherein
the separation element is configured to have variable transmittance and reflectance with respect to the first color component light,
the lighting apparatus further includes a first phosphor wheel device including a slit over a predetermined angular range,
the first color component light is incident on the separation element from the light source through the slit, and
the optical system combines the first color component light reflected by the separation element with the second color component light transmitted through the separation element and passing through the slit.
7. The lighting apparatus according to claim 6 , wherein the first color component light is a blue light, and the second color component light is a color component light including a green range.
8. The lighting apparatus according to claim 7 , wherein the separation element reflects a color component light having a wavelength longer than a wavelength in the green range of the second color component light.
9. The lighting apparatus according to claim 6 , wherein the light source is a solid-state light source element.
10. A projection-type image display apparatus comprising:
the lighting apparatus according to claim 6 .