JP2006301376A5

JP2006301376A5 -

Info

Publication number: JP2006301376A5
Application number: JP2005124284A
Authority: JP
Filing date: 2005-04-21
Publication date: 2008-02-07

Claims

A polarizing beam splitter that transmits specific linearly polarized light and emits it while reflecting other polarized light to generate return light, a light introduction surface for introducing light from a light source, and a total reflection surface for the return light A triangular prism or a triangular prism section having a functioning surface, and a phase difference plate that converts the return light into the specific linearly polarized light,
A polarization conversion member configured to emit the return light converted into the specific linearly polarized light from the polarization beam splitter.

The polarization conversion member according to claim 1,
The polarization beam splitter is disposed at a predetermined angle with respect to the light exit direction of the polarization conversion member, and the polarized light is reflected via the triangular prism or the triangular prism portion as the return light reflected by the polarization beam splitter. An annular reflection path that leads to the beam splitter is formed, and the specific light is detected by the 1 / 2λ plate that is the phase difference plate in the process from the return light passing through the annular reflection path to the polarizing beam splitter. A polarization conversion member that is converted into linearly polarized light.

The polarization conversion member according to claim 2,
A rod integrator that superimposes light incident from the light incident surface and emits the light from the light exit surface is provided outside the circular reflection path, and the specific linearly polarized light that has passed through the polarization beam splitter is transmitted from the rod integrator. A polarization conversion member that is incident on a light incident surface.

The polarization conversion member according to claim 2,
A rod integrator that superimposes light incident from a light incident surface and emits the light from the light output surface is provided in the circular reflection path, and the light that has passed through the rod integrator is incident on the polarization beam splitter. A polarization conversion member.

The polarization conversion member according to claim 1,
The polarization beam splitter is arranged orthogonal or substantially orthogonal to the light exit direction of the polarization conversion member, and the return light reflected by the polarization beam splitter is passed through the triangular prism or triangular prism portion. A reciprocal reflection path that leads to the polarizing beam splitter is formed, and a 1 / 4λ plate that is the retardation plate in the process until the return light passes through the reciprocating reflection path and reaches the polarizing beam splitter. A polarization conversion member that is converted into the specific linearly polarized light.

In the polarization conversion member according to claim 5,
The first surface other than the surface of the triangular prism is a light exit surface, the polarizing beam splitter is disposed on the light exit surface side, and the 1 / 4λ plate and the reflector are disposed on the second surface. A polarization conversion member characterized by being made.

In the polarization conversion member according to claim 5,
A first surface other than the surface of the triangular prism is a light output surface, and a rod integrator that forms part of the reciprocal reflection path is disposed between the light output surface and the polarization beam splitter, The polarization conversion member, wherein the 1 / 4λ plate and the reflection plate are arranged on two surfaces.

In the polarization conversion member according to claim 5,
The polarization conversion member includes a transparent rod member integrally including the triangular prism portion and the rod integrator portion, and the quarter λ plate and the reflecting plate are disposed on a surface facing the inclined surface of the triangular prism portion. A polarization conversion member, wherein the polarization beam splitter is disposed on a light exit surface of the rod integrator section.

In the polarization conversion member according to any one of claims 1 to 8,
A polarization conversion member, wherein a minute portion having a surface shape suitable for introducing light from a light source is formed on the surface of the triangular prism or the triangular prism portion.

The polarization conversion member according to any one of claims 1 to 8,
A light source that emits light toward the surface of the triangular prism or triangular prism portion;
An illuminating device comprising:

The lighting device according to claim 10.
The chief ray axis of the light source is set so that the refraction direction of the light source light in the triangular prism or the triangular prism portion is orthogonal or substantially orthogonal to the light exit surface of the polarization conversion member. .

The polarization conversion member according to claim 9,
A light source that condenses and guides outgoing light to the minute part of the triangular prism or triangular prism part;
An illuminating device comprising:

The illumination device according to claim 10, which emits red light;
The illumination device according to claim 10, which emits blue light;
The illumination device according to claim 10 that emits green light;
A light valve provided to receive each color light from each lighting device;
Projection means for synthesizing and projecting each color image light passing through each light valve;
A projection-type image display apparatus comprising:

A lighting device according to claim 10;
One full color light bulb,
Projection means for projecting image light obtained by passing through the full-color light valve;
A projection-type image display apparatus comprising:

The illumination device according to claim 10, which emits white light;
Separating means for separating white light emitted from the illumination device into red light, green light, and blue light;
A light valve provided to receive each color light,
Projection means for synthesizing and projecting each color image light passed through each light valve;
A projection-type image display apparatus comprising:

A lighting device according to claim 10;
One light bulb,
Means for supplying a video signal for each color to the light valve in synchronization with the emission timing of each color light;
Projection means for projecting image light obtained by passing through the light valve;
A projection-type image display apparatus comprising: