Light source device and projection-type display apparatus

Patent metadata

Field	Value
Publication number	US-9310033-B2
Application number	US-201314371920-A
Country	US
Kind code	B2
Filing date	Jan 8, 2013
Priority date	Jan 12, 2012
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

Abstract

A light source device includes a plurality of light sources with different polarizations. A combined wavelength band of the light of a first polarization and second polarization is a first wavelength band. A combined wavelength band of a third polarization and fourth polarization is a second wavelength band. A plurality of selective transmission elements transmits one or more combined light of one or more polarizations and reflects one or more light of one or more polarizations. Thus, the light of the first polarization, the light of the second polarization and the light of the third polarization passing through a third selective transmission element, and the light of the fourth polarization reflected by the third selective transmission element proceed in the same direction.

First claim

What is claimed is:

1. A light source device comprising;
a first light source that emits light of a first polarization;
a second light source that emits light of a second polarization whose polarization direction is different from the light of the first polarization by 90 degrees, wherein a combined wavelength band of the light of the first polarization and the light of the second polarization is a first wavelength band;
a third light source that emits light of a third polarization and of a wavelength band which is different from the first wavelength band;
a first selective transmission element that transmits the light of the first polarization and reflects the light of the second polarization based on the polarization direction of the light;
a second selective transmission element that transmits combined light of the light of the first polarization passing through the first selective transmission element and the light of the second polarization reflected by the first selective transmission element based on the wavelength band of the light, and reflects the light of the third polarization based on the wavelength band of the light;
a fourth light source that emits light of a fourth polarization whose polarization direction is different from the light of the third polarization by 90 degrees; and
a third selective transmission element that transmits the combined light of the light of the first polarization and the light of the second polarization passing through the second selective transmission element based on the wavelength band of the light, transmits the light of the third polarization reflected by the second selective transmission element based on the polarization direction of the light, and reflects the light of the fourth polarization,
wherein the light of the first polarization and the light of the second polarization passing through the second selective transmission element, and the light of the third polarization reflected by the second selective transmission element proceed in the same direction,
wherein the light of the first polarization, the light of the second polarization and the light of the third polarization passing through the third selective transmission element, and the light of the fourth polarization reflected by the third selective transmission element proceed in the same direction.

2. The light source device according to claim 1 , further comprising:
a fifth light source that emits light of a fifth polarization;
a sixth light source that emits light of a sixth polarization whose polarization direction is different from the light of the fifth polarization by 90 degrees, wherein a combined wavelength band of the light of the third polarization and the light of the fourth polarization is a second wavelength band which is different from the first wavelength band, wherein a combined wavelength band of the light of the fifth polarization and the light of the sixth polarization is a third wavelength band which is different from the second wavelength band;
a fourth selective transmission element that transmits combined light of the light of the first polarization, the light of the second polarization and the light of the third polarization passing through the third selective transmission element and the light of the fourth polarization reflected by the third selective transmission element based on the wavelength of the light, and reflects the light of the fifth polarization based on the wavelength band of the light;
a fifth selective transmission element that transmits combined light of the light of the first polarization, the light of the second polarization, the light of the third polarization and the light of the fourth polarization passing through the fourth selective transmission element based on the wavelength band of the light, transmits the light of the fifth polarization reflected by the fourth selective transmission element based on the polarization direction of the light, and reflects the light of the sixth polarization based on the polarization direction of the light;
wherein the light of the first polarization, the light of the second polarization, the light of the third polarization, the light of the fourth polarization and the light of the fifth polarization passing through the fifth selective transmission element and the light of the sixth polarization reflected by the fifth selective transmission element proceed in the same direction.

3. The light source device according to claim 1 , wherein when the light of the first polarization, the light of the second polarization and the light of the third polarization passing through the third selective transmission element and the light of the fourth polarization reflected by the third selective transmission element proceed in the same direction, the light of the first polarization, the light of the second polarization, the light of the third polarization and the light of the fourth polarization are superimposed on each other or proximate to each other.

4. The light source device according to claim 2 , wherein when the light of the first polarization, the light of the second polarization, the light of the third polarization, the light of the fourth polarization and the light of the fifth polarization passing through the fifth selective transmission element and the light of the sixth polarization reflected by the fifth selective transmission element proceed in the same direction, the light of the first polarization, the light of the second polarization, the light of the third polarization, the light of the fourth polarization, the light of the fifth polarization and the light of the sixth polarization are superimposed on each other or proximate to each other.

5. The light source device according to claim 2 , wherein the first wavelength band, the second wavelength band and the third wavelength band are in an ascending order from a shortest wavelength, or the third wavelength band, the second wavelength band and the first wavelength band are in an ascending order from the shortest wavelength.

6. A projection-type display apparatus comprising:
the light source device according to claim 1 ;
a condenser lens for condensing a light flux emitted by the light source;
a light intensity equalizing element provided on an emission side of the condenser lens, the light intensity equalizing element equalizing light intensity of incident light flux;
a relay optical system that guides the light flux emitted by the light intensity equalizing element;
a light valve on which the light flux emitted by the relay optical system is incident, the light valve generating image light; and
a projection optical system that projects the image light generated by the light valve.

7. A light source device comprising:
a first light source that emits first light of a first wavelength band;
a second light source that emits light of a first polarization direction and of a different wavelength band from the first wavelength band;
a third light source that emits light of a second polarization whose polarization direction is different from the light of the first polarization by 90 degrees;
a first selective transmission element that transmits the first light based on the wavelength band of the light, and reflects the light of the first polarization based on the wavelength band of the light; and
a second selective transmission element that transmits the first light passing through the first selective transmission element based on the wavelength band of the light, transmits the light of the first polarization reflected by the first selective transmission element based on the polarization direction of the light, and reflects the light of the second polarization based on the polarization direction of the light,
wherein the first

Assignees

• Yamada Akihiro
• Utakoji Takeshi
• Samejima Kenji
• Kida Hiroshi
• Sawanaka Tomohiko
• Yagyu Shinji
• Mitsubishi Electric Corp

Inventors

• Yamada Akihiro
• Utakoji Takeshi
• Samejima Kenji
• Kida Hiroshi
• Sawanaka Tomohiko
• Yagyu Shinji

Classifications

• H04N9/3152

  for shaping the light beam (beam shaping per se G02B27/09) · CPC title

• G03B21/2073 Primary

  Polarisers in the lamp house (peculiar to electronic spatial light modulators H04N9/3197) · CPC title

• H04N9/3164

  using multiple light sources · CPC title

• G03B33/12

  using beam-splitting or beam-combining systems, e.g. dichroic mirrors · CPC title

• H04N9/3167

  for polarizing the light beam (polarizing optical systems per se G02B27/28) · CPC title