Image display mirror for a vehicle

• US 10,377,312 B2
• Filed: 01/13/2016
• Issued: 08/13/2019
• Est. Priority Date: 01/14/2015
• Status: Active Grant

• Current Assignee: Nitto Denko Corporation
• Original Assignee: Nitto Denko Corporation
• Inventors: Takada, Katsunori, Kameyama, Tadayuki, Kitamura, Yoshitsugu, Kimura, Keisuke, Kuramoto, Hiroki
• Primary Examiner(s): Crockett, Ryan
• Application Number:
  US14/994,620
• Publication Number:
  US 20160200256A1
• Time in Patent Office: 1,308 Days
• Field of Search: None
• CPC Class Codes: B60R 1/083 Anti-glare mirrors, e.g. "day-night" mirrors
• CPC Class Codes: B60R 1/084 using a removable filtering or hiding screen associated with windows or windscreens B60J3/00
• CPC Class Codes: B60R 1/088 using a cell of electrically changeable optical characteristic, e.g. liquid-crystal or electrochromic mirrors
• CPC Class Codes: B60R 1/12 Mirror assemblies combined with other articles, e.g. clocks
• CPC Class Codes: B60R 2001/1215 with information displays
• CPC Class Codes: G02B 27/144 using partially transparent surfaces without spectral selectivity G02B27/147 takes precedence
• CPC Class Codes: G02B 27/281 used for attenuating light intensity, e.g. comprising rotatable polarising elements
• CPC Class Codes: G02B 5/08 Mirrors vehicle mirrors involving special optical features B60R1/08
• CPC Class Codes: G02B 5/30 Polarising elements light-modulating devices with active elements G02F1/00
• CPC Class Codes: G02B 5/3083 Birefringent or phase retarding elements G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001

Abstract

Provided is an image display mirror that includes a half mirror and an image display apparatus, reduces an influence of a reflected image provided by the half mirror, and is excellent in visibility of an image displayed on the image display apparatus. The image display mirror for a vehicle includes a first polarizing plate, a half mirror, and an image display apparatus in the stated order from a viewer side. In one embodiment, the first polarizing plate includes a polarizer, and the direction of the polarizer of the first polarizing plate is set so that the transmittance of light output from the image display apparatus that is transmitted through the first polarizing plate becomes maximum.

Claims

1. An image display mirror for a vehicle, comprising:

a first polarizing plate, a half mirror, and an image display apparatus in the stated order from a viewer side,

wherein the first polarizing plate includes an absorption-type polarizer,

wherein the half mirror does not have a polarization function,

wherein the image display apparatus includes a second polarizing plate including a polarizer, and

wherein an absorption axis of the polarizer of the second polarizing plate and the absorption axis of the polarizer of the first polarizing plate are substantially parallel to each other.

2. The image display mirror for a vehicle according to claim 1, wherein:

a direction of an absorption axis of the absorption-type polarizer is set so that a transmittance of light output from the image display apparatus that is transmitted through the first polarizing plate becomes maximum.

3. The image display mirror for a vehicle according to claim 1, wherein the first polarizing plate and the half mirror are brought into close contact with each other by interlayer filling.

4. The image display mirror for a vehicle according to claim 1, wherein the half mirror and the image display apparatus are brought into close contact with each other by interlayer filling.

5. The image display mirror for a vehicle according to claim 1, further comprising a λ

/4 plate on a viewer side of the first polarizing plate.

6. The image display mirror for a vehicle according to claim 1, wherein an angle formed between a reflection surface of the half mirror and an image display surface of the image display apparatus is more than 0°

and 45°

or less.