Optical: systems and elements – Single channel simultaneously to or from plural channels
Reexamination Certificate
1999-09-24
2001-12-04
Epps, Georgia (Department: 2873)
Optical: systems and elements
Single channel simultaneously to or from plural channels
C428S037000, C428S484100, C324S244100, C359S281000
Reexamination Certificate
active
06327089
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to improvements in a laminated transparent structure including an optical rotation film, and more particularly to such a laminated transparent structure to be used in a head-up display which is configured, for example, such that a driver of an automotive vehicle can observe an image of driving information projected as displaying light on a windshield glass in a manner that the vehicular information is superimposed on the frontal view.
2. Description of the Prior Art
A variety of laminated transparent structures have been hitherto proposed and put into practical use for a head-up display of an automotive vehicle. The laminated transparent structures include those of the type having a reflection film and those having an optically functional film. These laminated transparent structures are configured by directly applying the reflection film on a windshield glass, or by interposing the optically functional film between two glass plates as disclosed in Japanese Patent Provisional Publication No. 2-141720. Another laminated transparent structure has been disclosed in Japanese Patent Provisional Publication No. 5-279090 and Japanese Patent Provisional Publication No. 6-40271 (Japanese Patent Application No. 4-196841).
However, such conventional laminated transparent structures for the head-up display are or may be insufficient in impact resistance and penetration resistance. In view of this, a laminated transparent structure (including the optically functional film) improved in impact resistance and penetration resistance has been proposed as disclosed in Japanese Patent Provisional Publication No. 8-259280 (Japanese Patent Application No. 7-69506). However, this laminated transparent structure has such a tendency that the peripheral section of the optically functional film peels off or deforms owing to deterioration of adhesive (for the film) with age.
Thus, the above-discussed conventional laminated structures cannot meet the requirements of the impact and penetration resistance according to safety regulations such as JIS (Japanese Industrial Standard) No. R3211 (Automotive Vehicle Safety Glass) and R3212 (Automotive Vehicle Safety Glass Testing Method), and insufficient in durability throughout a long time use.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an improved laminated transparent structure for a reflective display, which can overcome the drawbacks encountered in conventional laminated transparent structures for a reflective display.
Another object of the present invention is to provide an improved laminated transparent structure for a reflective display, which is sufficiently high in impact resistance and penetration resistance so as to be safe upon being used as a windshield glass of an automotive vehicle.
A further object of the present invention is to provide an improved laminated transparent structure for a reflective display, which includes an optical rotation film and is high in adhesiveness of the optical rotation film to a glass plate while maintaining a high light resistance of a part (corresponding to the optical rotation film) of the laminated transparent structure so that the part is high in transparency.
A first aspect of the present invention resides in a laminated transparent structure for a reflective display, comprising a glass plate. A transparent layer is bonded to the glass plate. An optical rotation film is bonded to the glass plate with a hot-melt adhesive. The transparent layer may be a glass plate so that the laminated transparent structure takes the structure of a laminated glass. Otherwise, the transparent layer may be a transparent plastic layer so that the laminated transparent structure takes a bi-layer structure. The hot-melt adhesive may contain ultraviolet ray absorbing agent and/or light stabilizer.
A second aspect of the present invention resides a laminated transparent structure for a reflective display, comprising 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.
A third aspect of the present invention resides in a laminated glass for a reflective display, comprising a first glass plate. A second glass plate is provided. An intermediate film is disposed between the first and second glass plates to bond the first and second glass plates. An optical rotation is film disposed between the first and second glass plates. The optical rotation film is embedded in the intermediate film and located separate from the first glass plate. Additionally, a hot-melt adhesive is disposed between the optical rotation film and the second glass plate to bond the optical rotation film to the second glass plate.
A fourth aspect of the present invention resides in a bi-layer glass for a reflective display, comprising a glass plate. A transparent resin layer is provided. An intermediate film is disposed between the glass plate and the resin layer to bond the glass plate and the resin layer. An optical rotation film is disposed between the glass plate and resin layer. The optical rotation film is embedded in the intermediate film and located separate from the resin 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.
A fifth aspect of the present invention resides in a reflective display system, comprising a reflective display. The reflective display includes a glass plate. A transparent layer is bonded to the glass plate. The transparent layer is located on a side where a person resides, relative to the glass plate. An optical rotation film is disposed between the glass plate and the transparent layer. 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. Additionally, a light treating device is provided to cause light to be incident in a polarized state on the transparent layer, the light forming an image to be observed by the person.
According to the present invention, the laminated transparent structure (such as the laminated glass) is sufficiently high in impact resistance and penetration resistance so as to meet the requirements according to safe regulations such as JIS (Japanese Industrial Standard) Nos. R3211 and R3212. Therefore, the laminated transparent structure can be suitably used as a front windshield glass of an automotive vehicle, constituting a head-up display for an image of light representative of information such as driving information. In such a head-up display, double image can be effectively prevented from being formed under the action of the optical rotation film, so that the image of the information can be clearly observed on the windshield glass by a person (driver) in a passenger compartment. Additionally, by virtue of the hot-melt adhesive, the peripheral section of the optical rotation film can be prevented from peeling off from the glass plate, while deformation of see-through image in the windshield glass can be prevented. Furthermore, adding ultraviolet ray absorbing agent and/or light stabilizer to the hot-melt adhesive makes it possible to highly improve the light resistance, maintaining a good transparency of a part (corresponding to the optical rotation film) of the head-up display.
REFERENCES:
patent: 4749261 (1988-06-01), McLaughlin et al.
patent: 4973132 (1990-11-01), McDonald et al.
patent: 6042947 (2000-03-01), Asakura et al.
patent: 2-141720 (1990-05-01), None
patent: 5-279090 (1993-10-01), None
patent: 6-40271 (1994-02-01), None
patent: 8-259280 (1996-10-01), None
patent: 02000085057A (1998-09-01), None
English translation of Japanese Industrial Standard No. R3211, “Safety Glass for Road Vehicles” (1992).
English translation of Japanese Industrial Standard No. R3212,
Asakura Motoh
Hosaki Kenji
Kobayashi Kazuya
Kumagai Yoshihiro
Nishikawa Shinji
Central Glass Company Limited
Crowell & Moring LLP
Epps Georgia
Thompson Timothy J
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