JPH0716491Y2 - Window glass for vehicles with sun visor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a window glass with a sun visor for use in vehicles such as automobiles and railways.

[Prior Art] Conventionally, in a vehicle such as an automobile, a opaque plate (sun visor) that can be folded is arranged on the upper part of a glass window to prevent sunlight from entering the driver. Was blocked by the opaque plate as needed.

[Problems to be Solved by the Invention] The conventional sun visor needs to be installed separately from the glass and needs to be moved to a desired position by hand when necessary. Further, since the field of view is completely obstructed, there is a feeling of pressure, and the amount of light entering the room is reduced, resulting in darkness.

[Means for Solving the Problem] The present invention has been made to solve the conventional problem, and in a window glass for a vehicle with a sun visor, which has a hologram on its upper portion in a band shape, the hologram is at least horizontally. On the other hand, there is provided a window glass for a vehicle with a sun visor, which is a hologram having a diffraction angle for diffracting a part of visible light incident from above 0 ° to 20 ° outside the eye point region of the driver of the vehicle. To do.

FIG. 1 is a conceptual diagram showing an example of the configuration of the present invention. A hologram 4 is provided on the window glass of the vehicle body 2 in a band shape. The sunlight 3 is transmitted through the window glass, and the transmitted light 5 is transmitted through the hologram 4 to be dispersed and refracted. At this time, if sunlight is incident horizontally from 0 ° to 20 °, a part of the light does not reach the eyepoint area A of the driver 1 due to the specific diffraction angle of the hologram. Especially, the wavelength of 480n, which has the highest visibility by humans
It is desirable that part of the light of m to 510 nm does not reach the eyepoint area A of the driver 1. Therefore, it is possible to reduce the glare felt by the driver 1 of the vehicle without substantially hindering the daylighting of the vehicle. At this time, the hologram may be incorporated in the windshield or the window glass on the side of the car.

FIG. 2 shows some aspects of a window glass provided with a hologram, and is a partial cross-sectional view showing a main part of the window glass. FIG. 2A shows the hologram enclosed in laminated glass. Hologram 6 made of photopolymer
Is sealed by being interposed between the organic adhesive film layers 7 and 7'made of polybutyl vinylal (PVB) or the like, and glass plates 8 and 8'are arranged on both sides thereof. FIG. 2B uses a glass having a multi-layer structure in which an organic resin film such as urethane resin is provided in order to give the glass a function as a safety glass. The hologram 6 is enclosed by being interposed between a glass plate 8 and a resin film 9 made of urethane resin or the like. Fig. 2-C
Has a structure in which the hologram 6 is simply attached to the plate glass 8. At this time, as shown in the figure, it is preferable to protect the surface of the hologram 6 with the hologram protection film 10 made of plastic or the like.

The hologram material can be a photopolymer such as dichromated gelatin. The hologram includes a transmission type and a reflection type, and any of them can be used. However, when the transmissive type is used, it is less likely to impair the brightness inside the vehicle, which is preferable.

Further, in order to protect the hologram from ultraviolet rays and the like, it is preferable to attach a protective film against ultraviolet rays to the surface of the glass. further,
An antireflection film can be attached to the inside of the window glass to reduce the reflection of extra light and enhance the antiglare effect.

Further, in order to enhance the antiglare effect of the hologram, a method of coloring the glass in a portion substantially corresponding to the portion provided with the hologram or coloring an organic adhesive film such as polyvinyl butyral to reduce the visible light transmittance You may use together.

The hologram has an incident angle dependence on its diffraction efficiency, that is, an optimum incident angle in consideration of the diffraction efficiency. It is preferable to set the optimum incident angle of this hologram so that it will come to the driver at a sun altitude where the driver usually feels dazzling, because the brightness inside the vehicle is not significantly impaired. In particular,
It is preferable to have an optimum angle of incidence between 0 ° and 50 ° above horizontal. Therefore, the optimum incident angle of the hologram is adjusted by the inclination angle of the window glass such as the windshield into which the hologram is incorporated with respect to the horizontal.

In the present invention, a part of visible light, which is the most visible to human beings, is included in light incident from an angle at which the driver feels dazzling, that is, at least 0 ° to 20 ° above the horizontal. Some of the high wavelength 480nm ~ 510nm light,
It is diffracted and refracted by the hologram so that it does not travel in the driver's field of view, that is, in the driver's eye point region. For this reason, a part of the sunlight is blocked by the driver, and the driver is less likely to feel glare.
Regarding the amount of diffracted light, in order to reduce the driver's feeling of being dazzled, at least 10% or more of the light incident from 0 ° to 20 ° above the horizontal, and more preferably
20% or more should be prevented from diffracting and proceeding in the direction of the driver's field of view.

The hologram is laterally provided in a band shape on the glass. The width is appropriately selected depending on the shape of the glass or the like, but is generally provided above the eye level of the driver.

The light having the above wavelength may travel in any direction other than the driver's visual field, that is, the direction other than the driver's eye point region. For example, the direction toward the ceiling or the direction toward the feet can be considered, but not limited to this.

Furthermore, in order to prevent the decrease of the average visible light transmittance due to the provision of the hologram, in addition to the above configuration, the maximum of the diffraction efficiency is 400 nm to 600 nm, which is a wavelength with high visibility particularly by humans, preferably 480 nm to 510 nm. It is desirable to make it a hologram that you have. In this way, it is possible to obtain a JIS standard visible light transmittance of the automobile windshield or higher.

As described above, according to the present invention, the antiglare effect can be obtained without manually operating the opaque plate and without impairing the daylighting property in the vehicle.

Example A hologram film (thickness: 25 μm) made of dichromate gelatin and made of photopolymer was exposed to a diffraction grating by an argon ion laser, and then fixed by ultraviolet irradiation and heat treatment. This diffraction grating, when installed on the windshield of an automobile, is designed to diffract and transmit 20% of light with a wavelength of 480 nm to 510 nm incident from 0 ° to 20 ° above the horizontal in the ceiling direction of the automobile. .

The hologram film thus formed was sandwiched between the organic adhesive films at 150 nm above the laminated glass in a band shape.

Specifically, 2mm thick plate glass / 0.38mm thick PVB film / hologram film / 0.38mm thick PVB film / 2mm thick plate glass are stacked in this order, put in a rubber bag, and evacuated to 5torr. While maintaining at 130 ℃ for 30 minutes, pre-bonding, then 10
It was put in an autoclave at atmospheric pressure of 130 ° C and integrated.

When this was used on the windshield of an automobile as shown in Fig. 3, it functioned as a sun visor that did not impair the brightness inside the automobile (visible light transmittance of 70% or more) and did not require manual operation. .

[Advantages of the Invention] According to the present invention, it is possible to obtain a vehicle sun visor with an antiglare effect without manually operating the opaque plate and without impairing the brightness inside the vehicle. According to the invention of claim 3, the same anti-glare effect can be obtained in a brighter vehicle.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing an example of the configuration of the present invention. Further, FIG. 2 shows some aspects of a window glass provided with a hologram, and is a partial cross-sectional view of the main part of the window glass. FIG. 3 is an external view when the window glass according to the present invention is used for a windshield of an automobile. Here, 1 is a driver, 2 is a vehicle body, 4 and 6 are holograms,
Reference numerals 7 and 7'represent organic adhesive films, and reference numerals 8 and 8'represent glass plates.

Claims (3)

[Scope of utility model registration request] 1. A window glass for a vehicle with a sun visor having a hologram formed on the upper portion thereof in a band shape, wherein the hologram drives at least a part of visible light incident from 0 ° to 20 ° above the horizontal. A window glass for a vehicle with a sun visor, which is a hologram having a diffraction angle that diffracts outside the eye point region of the hand. 2. A window glass for a vehicle with a sun visor, which has a hologram in the form of a strip on its upper portion, wherein the hologram has a wavelength at which the hologram is incident from 0 ° to 20 ° above the horizontal.
A window glass for a vehicle with a sun visor, which is a hologram having a diffraction angle for diffracting a part of light of 480 nm to 510 nm to a portion other than an eye point region of a driver of the vehicle. 3. The window glass for a vehicle with a sun visor according to claim 1, wherein the hologram is a hologram having a peak wavelength of diffraction intensity of light at 400 nm to 600 nm.