JP2006056413A - Dashboard for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dashboard with less reflection to a windshield capable of freely selecting bright color tone and bright pattern and giving high design property. <P>SOLUTION: The dashboard for the vehicle installed in the vehicle is provided, in which a layer 2 for reducing a reflection ratio of a polarization component becoming s-polarization relative to a windshield surface of the vehicle is given onto a surface. The above layer may be in a film-like form and may be formed by coating. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vehicular dashboard, and more particularly to a vehicular dashboard.

  The dashboard for an automobile may be reflected on the windshield and cause adverse effects such as deterioration of driver visibility. For this reason, reflection on the windshield has been reduced by means such as color tone, shape, and surface properties, but this has not been sufficient.

  Therefore, attempts have been made to suppress surface reflection by applying an antireflection film to the windshield, but in order to obtain a sufficient antireflection effect, an antireflection film is required not only on the inside of the car but also on the outside of the car. Become. However, since the outside of the vehicle is subjected to wiper friction, it is actually difficult to provide an antireflection film from the viewpoint of durability, and as a result, a sufficient effect of antireflection is not obtained.

  In order to eliminate such drawbacks, Patent Document 1 (Japanese Patent Application Laid-Open No. 2001-177181) discloses reflected light from a dashboard for the purpose of reducing reflection of the dashboard due to reflection on the outer surface of the glass. It has been proposed that the windshield and the inner surface of the windshield have a function of scattering light having a specific incident angle.

Japanese Patent Laid-Open No. 2001-177281

  However, in the invention described in Patent Document 1, light from the dashboard is only scattered on the glass surface or inside, and it is still difficult to use a dashboard with a bright tone. That is, the color of the dashboard is limited to a dark dark color such as black, dark blue or gray, and there is a drawback that it is difficult to impart design properties such as a pattern with a bright color tone such as white or yellow.

  An object of the present invention is to provide a vehicular dashboard that overcomes the above-mentioned drawbacks of the prior art and can freely use bright colors.

  The present invention has been made in order to eliminate the above-mentioned drawbacks, and is a vehicle dashboard installed in a vehicle, the windshield surface of the reflected light reflected toward the windshield surface of the vehicle A dashboard for a vehicle is provided in which a layer for reducing the reflectance of a polarization component that becomes s-polarized light is provided on the surface. This layer may be in the form of a film or may be formed by coating. If this layer is in the form of a film, it has the advantage of being easy to stick to the dashboard even after the vehicle is complete, and if this layer is formed by a coating, it is thin and attractive. There is an advantage of being good.

  In the dashboard of the present invention, since there is little reflection on the windshield, it is possible to freely select a bright color tone, a design, and the like as necessary, and to impart high designability.

  In automobile dashboards, external light such as sunlight and street lights incident through the windshield is scattered on the structure that constitutes the dashboard, and then reflected again by the windshield to the driver. Reach the eye range. FIG. 2 is a conceptual diagram showing this state, and external light 6 incident through the windshield 5 is scattered on the dashboard 1 surface and travels in various directions as scattered light 7. At this time, reflection is generated by light reflected in the eye point direction of the driver among scattered light that is scattered in the direction of the windshield 5 and reflected by the glass surface.

  In the present invention, since the reflected light of the windshield has a large amount of s-polarized light component, if the dashboard is provided with a layer that reduces the reflectance of s-polarized light, the s-polarized light from the dashboard toward the glass plate is reduced. This is made by paying attention to the fact that the reflected light toward the driver's eye point is reduced.

It is generally known that incident light is reflected at the interface between two media having different refractive indexes. The reflectance at that time varies depending on the polarization component. As shown in the conceptual diagram of FIG. 4, when the incident angle and the reflection angle from the air to the glass are θ _A and the internal angle in the glass is θ _G , the respective reflectances Rs and Rp for the s-polarized light and the p-polarized light are It is given as equation (1).

In particular, it is known that p-polarized light has a reflectance Rp of zero at an angle called Brewster angle (θ _B ). FIG. 5 is a graph showing the reflectance at the interface between air and glass. In a glass with a refractive index of 1.5, when θ _B = 54 °, Rp of p-polarized light becomes zero. Accordingly, all of the reflected light at this time becomes an s-polarized component. The inclination angle theta of the glass shown in Figure 2 is in the neighborhood 30 ° in normal passenger car, with respect to the eye point of the driver, the reflection angle of the glass surface when the glare occurs in the vicinity of the theta _B. That is, as shown in the graph of FIG. 5, within the driver's eye range, the shallow reflection angle is 80% and the deep reflection angle is about 70% is the s-polarized component. Therefore, most of the components of the reflected light that cause the reflection that hinders the driver's field of view are s-polarized light. If the s-polarized component is reduced from the reflected light on the dashboard, the driver uses the windshield. The amount of light reaching the eye point can be reduced.

  FIG. 1 is a cross-sectional view showing an example of the configuration of a dashboard according to the present invention. The design layer 3 and the polarizing layer 2 are laminated on the molded body 4 which is a base structure. In this case, the polarizing layer 2 corresponds to a layer that reduces the reflectance of the polarization component that becomes s-polarized light with respect to the windshield surface of the vehicle. A conventionally known dashboard can be used as the base structure, and for example, it is a molded body made of a low density resin such as polypropylene, expanded polypropylene, polyvinyl chloride, or acrylonitrile / styrene acrylate. The design layer is not essential, but can be used for improving design properties, and a resin film printed with a bright color pattern can be used. Particularly preferred is a plastic foil in the form of thermoplastic polyolefin.

  The polarizing layer 2 has a function of reducing the reflectance of the polarization component that becomes s-polarized light with respect to the windshield surface of the vehicle. In order to reduce the reflectance of a specific polarization component, it is most preferable to absorb the polarization component, but the present invention is not limited to this. As an example of a material that absorbs a specific polarization component, there is one in which a film made of a polymer material is uniaxially stretched and then colored with a dichroic dye. Examples of the polymer material in this case include polyvinyl alcohol (PVA), polycarbonate (PC), and polyethyl terephthalate (PET). Examples of the dichroic dye include iodine, phthalocyanine, azo, anthraquinone, and dioxazine.

  In FIG. 2, the film is used by being attached to the dashboard. However, the present invention is not limited to this, and the polarizing layer may be formed by coating. For example, if a liquid crystal monomer added with a dichroic dye such as phthalocyanine, polymerized to become a polymer liquid crystal is applied to a molded body and polymerized in an aligned state to obtain a polymer liquid crystal aligned in a certain direction, It can be used as a polarizing layer in the present invention. Polarization polymerization may be performed during the polymerization. Moreover, as a material for forming a commercially available polarizing layer, a polarizing coating material manufactured by OPTIVA, USA using a discotic liquid crystal can be exemplified. This polarizing coating material is characterized in that it can impart polarizing properties in the direction of application with a roller or the like.

  As conceptually shown in FIG. 3, in the automobile using the dashboard 1 of the present invention, external light incident through the windshield is scattered on the dashboard 1 surface. When a layer that absorbs the s-polarized light component with respect to the surface of the windshield 5 is used as the polarizing layer, the s-polarized light component with respect to the windshield surface of the external light that has reached the surface of the dashboard 1 is part of the dashboard 1. Therefore, only the p-polarized component enters the windshield 5 as the scattered light 10. The scattered light 10 that has reached the windshield 5 in this way passes through the windshield 5 and is emitted as emitted light 12 to the outside of the automobile, with almost no reflection on the glass surface. Therefore, the reflected light 11 reaching the eye point 9 of the driver of the automobile is greatly reduced, and the reflected image 8 of the dashboard 1 is reduced.

  FIG. 6 shows a dashboard according to the present invention and a dashboard having a conventional configuration. In the dashboard according to the present invention, a polarization component that becomes s-polarized light on the windshield surface out of reflected light reflected toward the windshield surface is 100. % Is a graph comparing reflectance that is reflected on the windshield, and the effect of the present invention is clear.

  The present invention will be described more specifically with reference to examples. However, the examples do not limit the present invention.

Example 1
As shown in FIG. 1, a resin film 3 printed with a bright pattern is laminated on a molded body 4 made of polypropylene, and a layer 2 obtained by stretching polyvinyl alcohol and dyeing with iodine is laminated thereon as a polarizing layer. Dashboard 1 is created. The form in which this is incorporated in an automobile has the configuration shown in FIG. In a commercial passenger car with a windshield 1 mounting angle θ of 30 °, when measuring the brightness of the dashboard reflection on the windshield, the entire area where the windshield reflection occurs at the eyepoint 9 position of the driver It becomes 1/5 or less with respect to the reflected brightness when the polarizing layer at the time of measurement is not laminated.

  The incident angle when the scattered light at that time reaches the driver's eye point is 45 ° to 72 °. In particular, in the A zone, which is the viewing zone defined for the windshield as a safety glass for automobiles, the incident angle of the scattered light involved in the reflection is 45 ° to 65 °, and within this A zone is 1/10 or less. Moreover, it becomes about 1/15 near the driver's front. This result is a level at which the driver does not care about the obstruction of the windshield's visual field due to the reflection of the dashboard when the driver actually drives the car.

(Example 2)
By using a photocrosslinkable liquid crystal monomer containing a phthalocyanine-based dichroic dye as a polarizing coating material on a laminate of a molded body and a designable resin film, and irradiating polarized ultraviolet light after coating treatment Liquid crystal alignment and crosslinking are performed to make a polymer liquid crystal. Since the dye is aligned in the same direction along the liquid crystal, the function as a polarizing layer is exhibited.

  When the dashboard formed by the above method is incorporated as the automobile dashboard 1 shown in FIG. 3, the reflection of the dashboard on the windshield is reflected by the reflected luminance measured at the driver's eyepoint 9 position. It becomes 1/5 or less on the entire surface of the windshield 1 with respect to the reflected brightness when the layers are not laminated. In particular, it is 1/10 or less in the A zone, which is the viewing zone defined as safety glass for automobiles, and is about 1/15 in front of the driver, and almost the same effect as a dashboard with a polarizing film laminated is obtained. There is a remarkable effect of suppressing reflection.

  The present invention can be used as a vehicular dashboard with little reflection on the windshield.

Sectional drawing which shows the structure of the dashboard of this invention. The conceptual diagram showing the positional relationship of the windshield and dashboard in a motor vehicle. The conceptual diagram showing the relationship between a driver | operator and the dashboard reflection in a windshield. The conceptual diagram showing the relationship between the reflected light and incident light in an interface when external light injects into glass from the air. The graph showing the ratio [Rs / (Rs + Rp)] of the reflectance Rs of the s-polarized component of light incident on the glass from the air and the reflectance Rp of the p-polarized component and the entire reflected light. The graph which compared the reflectance used as the reflection in a windshield with the dashboard of this invention, and the dashboard of a conventional structure.

Explanation of symbols

1: Dashboard 2: Polarizing layer 3: Design layer 4: Molded body 5: Windshield 6: External light 7: Scattered light 8: Reflected image 9: Eye point

Claims (3)

  A dashboard for a vehicle installed in a vehicle, wherein a layer that reduces the reflectance of a polarization component that is s-polarized with respect to the windshield surface of the reflected light that is reflected toward the windshield surface of the vehicle is a surface The dashboard for vehicles that has been granted to.   The vehicle dashboard according to claim 1, wherein the layer is a film. The vehicle dashboard according to claim 1, wherein the layer is formed of a coating.

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