Projection apparatus having polarizing plate which absorbes and reflects output light, and vehicle

Patent metadata

Field	Value
Publication number	US-9904052-B2
Application number	US-201515306930-A
Country	US
Kind code	B2
Filing date	May 19, 2015
Priority date	Jun 6, 2014
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

Abstract

The present invention provides a projection apparatus capable of clearly displaying a projected image, and allowing the sight behind the projected image to be viewed to a sufficient degree. A projection apparatus ( 1 ) of the present invention includes a light irradiation device ( 3 ) configured to emit an output light ( 2 ) having one polarized light component, and a polarizing plate ( 4 ) including a polarizer ( 41 ) irradiated with the output light ( 2 ), wherein in the polarizing plate ( 4 ), an absorption axis is arranged to absorb and reflect the output light ( 2 ) by the polarizing plate, reflectance of the polarizing plate ( 4 ) for the output light ( 2 ) is 10% or more, and single transmittance of the polarizing plate ( 4 ) is in the range of 30% to 90%.

First claim

What is claimed is:

1. A projection apparatus comprising:
a light irradiation device configured to emit an output light having one polarized light component; and
a polarizing plate including a polarizer irradiated with the output light,
wherein in the polarizing plate, an absorption axis is arranged to absorb and reflect the output light by the polarizing plate,
reflectance of the polarizing plate for the output light is 10% or more,
single transmittance of the polarizing plate is in a range of 30% to 90%, and
the polarizer contains an aromatic disazo compound represented by the following general formula (1):

where Q 1 represents a substituted or unsubstituted aryl group; Q 2 represents a substituted or unsubstituted arylene group: R 1 independently represents a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted acetyl group, a substituted or unsubstituted benzoyl group, or a substituted or unsubstituted phenyl group; M represents a counter ion; m represents an integer of 0 to 2; and n represents an integer of 0 to 6, where at least one of m and n is not 0, and 1≦m+n≦6; and if m is 2, each R 1 may be the same or different.

2. The projection apparatus according to claim 1 , wherein the reflectance of the polarizing plate for the output light is 90% or less.

3. The projection apparatus according to claim 1 , wherein the output light consists substantially of the one polarized light component.

4. The projection apparatus according to claim 1 , wherein the output light is linearly polarized light, circularly polarized light, or elliptically polarized light.

5. The projection apparatus according to claim 1 , wherein the light irradiation device is a projector, a liquid crystal display, an organic electroluminescence light-emitting device, or a laser projector.

6. The projection apparatus according to claim 1 , wherein the polarizing plate serves as a light control window capable of adjusting a transmission quantity of light by means of electric power.

7. A vehicle including the projection apparatus according to claim 1 .

Assignees

• Nitto Denko Corp

Inventors

• Matsuda Shoichi
• Asanoi Yoshiaki

Classifications

• G02B2027/0118

  comprising devices for improving the contrast of the display / brillance control visibility · CPC title

• G02B27/0101 Primary

  characterised by optical features (G02B27/0172 takes precedence) · CPC title

• G03B21/62

  Translucent screens · CPC title

• G03B21/2073

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

• G02B1/08

  made of polarising materials · CPC title