Laminated transparent structure for reflective display

• US 6,327,089 B1
• Filed: 09/24/1999
• Issued: 12/04/2001
• Est. Priority Date: 09/30/1998
• Status: Expired due to Fees

• Current Assignee: Central Glass Company Limited, Nippon Mitsubishi Oil Corporation (ENEOS Holdings, Inc.)
• Original Assignee: Central Glass Company Limited, Nippon Mitsubishi Oil Corporation (ENEOS Holdings, Inc.)
• Inventors: Kumagai, Yoshihiro, Nishikawa, Shinji, Kobayashi, Kazuya, Asakura, Motoh, Hosaki, Kenji
• Primary Examiner(s): Epps, Georgia
• Assistant Examiner(s): Thompson, Timothy J
• Application Number:
  US09/405,179
• Time in Patent Office: 802 Days
• Field of Search: 359/281, 359/484, 359/618, 359/256, 359/324, 359/583, 324/244.1, 428/437
• US Class Current: 359/618
• CPC Class Codes: B32B 17/10018 comprising only one glass sheet
• CPC Class Codes: B32B 17/10036 comprising two outer glass sheets
• CPC Class Codes: G02B 2027/012 comprising devices for attenuating parasitic image effects
• CPC Class Codes: G02B 27/01 Head-up displays
• CPC Class Codes: G02B 27/0101 characterised by optical features G02B27/0172 takes precedence
• CPC Class Codes: G02B 27/283 used for beam splitting or combining
• CPC Class Codes: G02B 5/30 Polarising elements light-modulating devices with active elements G02F1/00
• CPC Class Codes: Y10T 428/31801 Of wax or waxy material

Abstract

A laminated transparent structure for a reflective display which is used, for example, as a head-up display of an automotive vehicle. The laminated transparent structure comprises a glass plate. A transparent layer is bonded to the glass plate. An optical rotation film is disposed between the glass plate and the transparent layer. Additionally, a hot-melt adhesive is disposed between the optical rotation film and the glass plate to bond the optical rotation film to the glass plate.

Claims

1. A laminated transparent structure for a head-up display comprising:

a glass plate;

a transparent layer bonded to said glass plate;

an optical rotation film; and

a hot-melt adhesive for bonding said optical rotation film to said glass plate, wherein said hot-melt adhesive has a thickness ranging from 1 to 50 μ

m.

3. A laminated transparent structure as claimed in claim 1, wherein said optical rotation film includes a liquid crystal polymer which is in twisted nematic orientation under a liquid crystal condition and is in a glassy state at a temperature lower than liquid crystal transition point of the high polymer.

4. A laminated transparent structure as claimed in claim 1, wherein said optical rotation film includes a liquid crystal material which is in nematic orientation under a liquid crystal condition, the nematic orientation being fixed under one of photo cross-linking and thermal cross-linking.

5. A laminated transparent structure as claimed in claim 1, wherein said hot-melt adhesive contains a main ingredient formed of at least one resin selected from the group consisting of colorless and transparent polyvinyl acetal resin, polyethylenevinyl acetate resin, and polyvinyl butyral resin.

6. A laminated transparent structure as claimed in claim 1, wherein said hot-melt adhesive contains at least one selected from the group consisting of ultraviolet ray absorbing agent and light stabilizer.

10. A laminated transparent structure as claimed in claim 1, wherein said hot-melt adhesive has a thickness ranging from 5 to 25 μ

m.

2. A laminated transparent structure for a head-up display comprising:

a glass plate;

a transparent layer bonded to said glass plate;

an optical rotation film disposed between said glass plate and said transparent layer; and

a hot-melt adhesive disposed between said optical rotation film and said glass plate to bond said optical rotation to said glass plate, wherein said hot-melt adhesive has a thickness ranging from 1 to 50 μ

m.

11. A laminated transparent structure as claimed in claim 2, wherein said hot-melt adhesive has a thickness ranging from 5 to 25 μ

m.

7. A laminated transparent structure for a head-up display, comprising:

a first glass plate;

a second glass plate;

an intermediate film disposed between said first and second glass plates to bond said first and second glass plates;

an optical rotation film disposed between said first and second glass plates, said optical rotation film being embedded in said intermediate film and located separate from said first glass plate; and

a hot-melt adhesive disposed between said optical rotation film and said second glass plate to bond said optical rotation film to said second glass plate, wherein said hot-melt adhesive has a thickness ranging from 1 to 50 μ

m.

12. A laminated transparent structure as claimed in claim 7, wherein said hot-melt adhesive has a thickness ranging from 5 to 25 μ

m.

15. A laminated glass as claimed in claim 7, wherein said intermediate film comprises polyvinyl butyral and said hot-melt adhesive comprises at least one resin selected from the group consisting of polyvinyl acetal resin, polyethylenevinyl acetate resin, and polyvinyl butyral resin.

8. A bi-layer glass for a head-up display, comprising:

a glass plate;

a transparent resin layer;

an intermediate film disposed between said glass plate and said resin layer to bond said glass plate and said resin layer;

an optical rotation film disposed between said glass plate and resin layer, said optical rotation film being embedded in s aid intermediate film and located separate from said resin layer; and

a hot-melt adhesive disposed between said optical rotation film and said glass plate to bond said optical rotation film to said glass plate, wherein said hot-melt adhesive has a thickness ranging from 1 to 50 μ

m.

13. A bi-layer glass as claimed in claim 8, wherein said hot-melt adhesive has a thickness ranging from 5 to 25 μ

m.

16. A laminated glass as claimed in claim 8, wherein said intermediate film comprises polyvinyl butyral and said hot-melt adhesive comprises at least one resin selected from the group consisting of polyvinyl acetal resin, polyethylenevinyl acetate resin, and polyvinyl butyral resin.

9. A head-up display system comprising:

(A) a head-up display

a glass plate,

a transparent layer bonded to said glass plate, said transparent layer being located on a side where a person resides, relative to said glass plate,

an optical rotation film disposed between said glass plate and said transparent layer, and

a hot-melt adhesive disposed between said optical rotation film and said glass plate to bond said optical rotation film to said glass plate, wherein said hot-melt adhesive has a thickness ranging from 1 to 50 μ

m; and

(B) a light treating device for causing light to be incident in a polarized state on said transparent layer, the light forming an image to be observed by the person.

14. A head-up display system as claimed in claim 9, wherein said hot-melt adhesive has a thickness ranging from 5 to 25 μ

m.