Head-up display device and laminated glass for head-up display device
First Claim
1. A head-up display device comprising information projection means emitting information in form of light rays, and a windshield glass having a reflecting surface for reflecting the light rays toward an observer inside a vehicle, whereina first light path is defined between a first reflecting surface prepared on an internal surface of the windshield glass and the observer by a first light ray that is emitted from the information projection means, reflected by the first reflecting surface, and projected toward the observer, a second light path is defined between the internal surface and the observer by a second light ray that is emitted from the information projection means, refracted into the windshield glass at the internal surface, reflected by a second reflecting, surface prepared on an external surface of the windshield glass, and refracted out of the windshield glass at the internal surface toward the observer, the first reflecting surface and the second reflecting surface are non-parallel to each other so that the first light path and the second light path are approximating each other more than when the first reflecting surface and the second reflecting surface are arranged in parallel to each other, at least one surface selected from the first reflecting surface and the second reflecting surface is a ground reflecting surface formed by grinding the surface of the windshield glass so as to set the non-parallelity of the reflecting surfaces, the surface of the windshield glass includes a ground surface contacting the ground reflecting surface with an angle between 170°
- and 190°
, and a shading band is formed at least in a part of the periphery of the windshield glass, and the ground surface has, in a region where the shading band is formed, an edge that is opposite to the edge contacting the reflecting surface.
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Accused Products
Abstract
For prevention of ghost images from occurring on head-up displays, a glass surface is ground, and a reflecting surface with a wedge-shaped cross section is formed. Furthermore, in order to reduce optical distortion at the edge portion of the reflecting surface, a ground surface contacting the reflecting surface with an angle between 150° and 210° is formed. In accordance with the enlargement of the reflecting surface accompanied by the tendency of head-up displays becoming larger, the reflecting surface is divided into at least two regions, and the angle of the reflecting surface is optimized for each region.
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Citations
19 Claims
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1. A head-up display device comprising information projection means emitting information in form of light rays, and a windshield glass having a reflecting surface for reflecting the light rays toward an observer inside a vehicle, wherein
a first light path is defined between a first reflecting surface prepared on an internal surface of the windshield glass and the observer by a first light ray that is emitted from the information projection means, reflected by the first reflecting surface, and projected toward the observer, a second light path is defined between the internal surface and the observer by a second light ray that is emitted from the information projection means, refracted into the windshield glass at the internal surface, reflected by a second reflecting, surface prepared on an external surface of the windshield glass, and refracted out of the windshield glass at the internal surface toward the observer, the first reflecting surface and the second reflecting surface are non-parallel to each other so that the first light path and the second light path are approximating each other more than when the first reflecting surface and the second reflecting surface are arranged in parallel to each other, at least one surface selected from the first reflecting surface and the second reflecting surface is a ground reflecting surface formed by grinding the surface of the windshield glass so as to set the non-parallelity of the reflecting surfaces, the surface of the windshield glass includes a ground surface contacting the ground reflecting surface with an angle between 170° - and 190°
, anda shading band is formed at least in a part of the periphery of the windshield glass, and the ground surface has, in a region where the shading band is formed, an edge that is opposite to the edge contacting the reflecting surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
a first border plane is determined by parallel translation of a perpendicular plane including the reference point for 500 mm from the reference point toward the center axis of the vehicle, and a second border plane is determined by parallel translation of the perpendicular plane for 250 mm from the reference point away from the center axis of the vehicle, in the surface between the first and the second border planes, excluding a peripheral region within 150 mm from the periphery of the windshield glass, an angle between the ground surface and the non-ground surface is not more than 5 mrad. -
12. The head-up display device according to claim 1, wherein, taking as a reference point an intersecting point of the windshield glass with a center axis of a visual field, where the center axis of a visual field advances from an eyepoint of the observer in the light path parallel to a center axis of the vehicle within a horizontal plane including the eyepoint of the observer,
a first border plane is determined by parallel translation of a perpendicular plane including the reference point for 500 mm from the reference point toward the center axis of the vehicle, a second border plane is determined by parallel translation of the perpendicular plane for 250 mm from the reference point away from the center axis of the vehicle, and a third and a fourth border plane are determined by parallel translation of a horizontal plane including the reference point for 100 mm up and down from the reference point respectively, in the surface of the windshield glass circumscribed by the first to the fourth border planes, an angle between the ground surface and the non-ground surface is not more than 5 mrad.
- and 190°
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13. A laminated glass for a head-up display device, used as a windshield glass together with information projection means emitting information as light rays, including a reflecting surface for reflecting the light rays toward an observer in a vehicle and comprising at least two glass sheets attached to each other with an intermediate layer,
wherein the reflecting surface includes a ground surface formed by partially grinding a surface of the glass sheet, and the surface of the glass sheet includes a ground surface formed so as to contact the ground reflecting surface with an angle between 170° - and 190°
,a shading band is formed at least in a part of the periphery of the windshield glass, and the ground surface has, in a region where the shading band is formed, an edge that is opposite to the edge contacting the reflecting surface.
- and 190°
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14. A head-up display device comprising information projection means emitting information in form of light rays, and a windshield glass having a reflecting surface for reflecting the light rays toward an observer inside a vehicle, wherein
a first light path is defined between a first reflecting surface prepared on an internal surface of the windshield glass and the observer by a first light ray that is emitted from the information projection means, reflected by the first reflecting surface, and projected toward the observer, a second light path is defined between the internal surface and the observer by a second light ray that is emitted from the information projection means, refracted into the windshield glass at the internal surface, reflected by a second reflecting surface prepared on an external surface of the windshield glass, refracted out of the windshield glass at the internal surface toward the observer, the first reflecting surface and the second reflecting surface are non-parallel to each other so that the first light path and the second light path are approximating each other more than when the first reflecting surface and the second reflecting surface are arranged in parallel to each other, at least one surface selected from the first reflecting surface and the second reflecting surface is a ground reflecting surface formed by grinding the surface of the windshield glass so as to set the non-parallelity of the reflecting surfaces, and the ground reflecting surface is divided into at least two regions and the angle of each region with the surface of the windshield glass in a non-ground state increases as the region approaches the information projection means so as to reduce the divergence between the first light path and the second light path caused by different incident angles of light rays from the information projection means in compliance with the position in the reflecting surface.
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19. A laminated glass for a head-up display device, used as a windshield glass together with information projection means emitting information as light rays, including a reflecting surface for reflecting the light rays toward an observer in a vehicle and comprising at least two glass sheets attached to each other with an intermediate layer,
wherein the reflecting surface includes a ground surface formed by partially grinding a surface of the glass sheet, and the ground reflecting surface is divided into at least two regions, and the angle between the reflecting surface and the surface of the glass in a non-ground state increases as the region approaches the position for the information projection means.
Specification
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- Resources
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Current AssigneeNippon Sheet Glass Company Limited
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Original AssigneeNippon Sheet Glass Company Limited
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InventorsKimura, Masanobu, Furusawa, Satoshi, Muromachi, Takashi
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Primary Examiner(s)Ben, Loha
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Application NumberUS09/701,808Time in Patent Office578 DaysField of Search359/630, 359/631, 359/633, 359/634, 359/637, 359/573, 359/589, 359/894, 428/56, 428/141, 428/156, 428/172, 345/7, 345/8, 340/980, 340/961, 340/461US Class Current359/630CPC Class CodesB32B 17/10036 comprising two outer glass ...B32B 17/10146 Face treatment, e.g. etchin...B32B 17/10761 containing vinyl acetalG02B 2027/012 comprising devices for atte...G02B 2027/0121 Parasitic image effect atte...G02B 27/0018 with means for preventing g...G02B 27/0101 characterised by optical fe...Y10T 428/187 Continuous sectional layerY10T 428/24479 including variation in thic...
