| 摘要 |
In a vehicle head-up display device that reflects a display light transmitted through a dust-proof cover on a windshield or a combiner, and viewably displays display information as a virtual image from a driver's seat of a vehicle, the dust-proof cover has a light transmissive property produced by being rolled, when a line between a first point a first end side of the display in a longitudinal direction of the display and a second point being at the same height as the first point in a second end side opposite to the first end side is a longitudinal axis, and a luminance of a virtual image is adjusted by adjusting an angle between a rolling direction of a resin sheet used for the dust-proof cover and a virtual image longitudinal axis, which corresponds to the longitudinal axis, of a virtual image of the display reflected by the reflector. As a result, a polarization state of the display light is changed to enable the luminance of the virtual image to be adjusted without any increase in the number of parts and a body size. |
| 主权项 |
1. A vehicle head-up display device, comprising:
a casing that is disposed close to a driver's seat of a vehicle and has an opening, the vehicle having a windshield or a combiner disposed separately from the windshield; a light emitting element that is housed in the casing; a display that is housed in the casing and emits a display light indicating display information upon receiving a light emitted by the light emitting element; a reflector that is housed in the casing and reflects the display light; and a dust-proof cover that is made of a resin sheet and is disposed in the opening, wherein the display light transmitted through the dust-proof cover is reflected on the windshield or the combiner, whereby the display information is displayed as a virtual image to be visible from the driver's seat of the vehicle, the dust-proof cover, which is formed by rolling the resin sheet in a rolling direction, has a light transmission property, a line passing between a first point in a first end side of the display in a longitudinal direction of the display and a second point in a second end side of the display opposite to the first end side is defined as a longitudinal axis, the second point being at a same height as the first point, an angle between the rolling direction of the resin sheet and a virtual image longitudinal axis, which corresponds to the longitudinal axis, of the virtual image of the display reflected by the reflector is defined as an angle α, and a luminance of the virtual image is adjusted by adjusting the angle α. |
