JPH0529870Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a windshield window for controlling sunlight used in automobiles and the like.

[Summary of the idea]

This invention utilizes a light control film that has the function of selectively scattering incident light at a specific angle to the film in a windshield window used in automobiles to control sunlight. By partially covering the surface or between transparent plastic or glass, it prevents direct sunlight from hitting the driver's eyes.

[Conventional technology]

Conventionally, sun visors, laminated glass, and the like have been used to prevent sunlight from entering the eyes of drivers.

[Problem that the invention attempts to solve]

However, with conventional sunlight control methods, the effect is limited to a part of the windshield window, which limits the light-shielding range depending on the driver's eye level, and unnecessarily There are problems in that it obstructs the field of view and reduces transmittance.

This invention focuses on the above-mentioned problems with conventional windshields that control sunlight, and focuses on the problem that sunlight is scattered regardless of the driver's eye height and is scattered at angles far from the angle of incidence of sunlight. Some exterior scenes suggest windshield windows that look just like regular glass.

[Means for solving the problem]

That is, the sunlight control windshield window of the present invention irradiates ultraviolet rays from a predetermined angle onto a film of a resin composition consisting of a photopolymerizable oligomer and a photopolymerizable monomer, each having a different refractive index, or each photopolymerizable monomer. A light control film obtained by curing and curing, which selectively scatters only incident light within a predetermined angle range, and allows incident light at other angles to pass straight through and be seen through. is applied to the surface of a transparent plate or inserted between a plurality of transparent plates as a laminate.

The predetermined angle range is preferably within a range of 30 to 90 degrees downward from the outside of the vehicle toward the inside of the vehicle, as measured from the horizontal.

In addition, the light control film used in the present invention is obtained by curing a resin composition consisting of an oligomer and a monomer, or monomers each having a difference in refractive index, and is preferably a photopolymerizable film having a difference in refractive index. It can be obtained by curing a resin composition consisting of an oligomer and a photopolymerizable monomer or photopolymerizable monomers together by irradiating it with ultraviolet rays, but the angular dependence depends on the irradiation angle of ultraviolet rays, the refractive index of the resin composition, etc. will be determined.

The thickness of the light control film used in the present invention is 20 to 2000 μm. The manufacturing method of this light control film was previously described in the patent application publication published by the present inventors, JP-A No. 1-77001 "Light control board and its manufacturing method", and the same publication, JP-A No. 63-309902 "Light control board". Board and method for manufacturing the same".

Further, the transparent plastic plate used in the present invention is not particularly limited as long as it is transparent, and any transparent plastic plate can be used. Suitable examples include polycarbonate resin, acrylic resin, methacrylic resin, and polystyrene resin. Further, as the glass plate used in the present invention, a windshield used exclusively for automobiles can be used.

Further, in the present invention, the method for attaching the light control film to a transparent plate such as a transparent plastic plate or a glass plate is not particularly limited, and any known method can be used. For example, as shown in FIG. 3, the light control film 1 may be applied to the surface of a glass plate or transparent plastic plate 2, and as shown in FIG. Alternatively, as shown in FIG. 5, the light control film 1 may be sandwiched between the glass plates 2 and 2', and a plastic plate 3 may be further connected to the outer surface of the glass plate. good. Preferably, the outer surface of the plastic board is provided with a scratch-resistant coating.
The portion covered by the above coating is the upper part of the windshield window and is determined by the shape of the vehicle body used. The above specific angle is determined from the angle at which the windshield is attached and the altitude of the sun.

[Effect of idea]

The windshield of this invention scatters the sunlight that enters from the top of the windshield like frosted glass, but the scenery outside the car at an angle away from the angle of incidence of sunlight is exactly the same as normal glass. It has a visible effect. Therefore, even if the driver's eye level changes, direct sunlight can be prevented from entering the driver's eyes, and the scenery ahead can be seen in exactly the same way as seen through ordinary glass.

〔Example〕

Next, embodiments of the windshield of the present invention will be described with reference to the drawings.

100 parts of tribromophenoxyethyl acrylate (refractive index 1.567) per 100 parts of polyether urethane acrylate (refractive index 1.481) obtained by the reaction of polypropylene glycogen with an average molecular weight of 2000, toluene diisocyanate and 2-hydroxyethyl acrylate. A resin composition prepared by adding and mixing 6 parts of benzyl dimethyl ketal is applied to a thickness of about 300 microns on a horizontally placed glass plate measuring 60 cm x 120 cm. A rod-shaped high-pressure mercury lamp (80W/cm, 2kW, approximately 2cm in diameter, A glass plate with a light emitting length of 25 cm (manufactured by Ushio Electric) was placed horizontally and approximately parallel to the longitudinal direction of the glass plate, and ultraviolet rays were irradiated for 1 minute to obtain a cured film. This film cured on the glass plate is peeled off from the glass plate.

Two glass plates and two polyvinyl butyral films (PVB), each measuring 60 cm x 120 cm, were prepared, and the glass plates, PVB, cured film, PVB, and glass plates were laminated in this order, and heated and pressed using a known method to integrate them. A cured sheet is obtained.

The obtained cured sheet was cloudy when viewed from an inclined position within an angle range of 30 to 80 degrees in the one direction from the vertical plane, and was transparent when viewed from other angles. FIG. 5 shows the measurement results of turbidity for this cured sheet.

FIG. 1 shows a situation in which the windshield of the present invention is used in a passenger car. That is, sunlight that enters the driver's eyes is scattered, reducing glare. However, there is no problem with the driver's forward vision except for the upper part. Figure 2A shows that when the windshield according to the present invention is used, the incident angle downward from outside the vehicle (right side of the drawing) is 30° or less with respect to the horizontal, for example, 20°.
This shows the state in which a ray of light having an angle of 10° and 10° is transmitted as is. Figure 2B shows that when the above rear glass is used, the incident angle is 30° or more, for example, 45° and 60°.
This shows the state in which a ray with .

[Brief explanation of the drawing]

FIG. 1 is a side view showing the windshield of the present invention being used in an automobile, and FIG. 2 is a view showing its light transmission state. Moreover, FIGS. 3 to 5 are cross-sectional views of the windshield of the present invention. Furthermore, FIG. 6 is a graph showing one specific example of the angle dependence characteristic diagram of the film. Explanation of symbols, a...car, b...sun, c...
...Windshield of the present invention, d... Sunlight, e
...Scattered light.

Claims (1)

[Claims for Utility Model Registration] (1) A film of a resin composition consisting of a photopolymerizable oligomer and a photopolymerizable monomer, or photopolymerizable monomers each having a different refractive index, is cured by irradiating ultraviolet rays from a predetermined angle. A light control film obtained by selectively scattering only incident light within a predetermined angle range, and allowing incident light at other angles to pass straight through and be seen through; An automobile windshield window is made of a laminate attached to the surface of a transparent plate or interposed between a plurality of transparent plates. (2) The windshield window according to claim 1, wherein the predetermined angular range is within a range of 30 to 90 degrees downward from the outside of the vehicle toward the inside of the vehicle as measured from the horizontal.