JPH0740743A - Shading device of vehicle - Google Patents

Abstract

PURPOSE:To provide a shading device of a vehicle which gives no unpleasant feeling to occupants, and can regulate the light permeability of the incident light into a car room. CONSTITUTION:In a glass roof device M of a vehicle to regulate the light permeability of the incident light into a car room by superposing a fixed shading member 1 and a movable shading member 2 to shade the incident light, the fixed shading member 1 and the movable shading member 2 have polalizing membranes to distribute the light in specific directions respectively, and the system is composed to convert gradually the distributing direction of the polalizing membrane of the variable shading member 2,by driving to rotate the movable shading member 2 to the fixed shading member 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light-shielding device for a vehicle, and more particularly to adjusting the light transmittance of a light beam entering a vehicle interior.

[0002]

2. Description of the Related Art Vehicles such as automobiles are generally known in which a window glass and a glass roof are provided on a ceiling portion of the vehicle in order to take in sunlight into the vehicle interior.
In such a vehicle, for example, Japanese Patent Application No. 59-222440 has been applied for a device that adjusts the light transmittance of a light beam that enters the passenger compartment according to the intensity of sunlight. In this device, two plates in which two types of band-shaped polarizing films having different polarization directions are alternately arranged in a row at regular intervals are stacked, and at least one of the plates is used as a movable plate. It controls the light transmittance.

[0003]

However, as shown in FIG. 15, two types of strip-shaped polarizing films a and b having different polarization directions are alternately arranged in rows on the two plates A and B. Therefore, when one of the two plates A and B is moved, a state where the plates A and B are displaced as shown in FIG. 16 occurs during the movement, and the plates A and B are transmitted. The light beam has a portion having different light transmittance depending on the overlapping of the polarizing films a and b. In this case (in the case of FIG. 16), the light rays that have passed through the two plates A and B are incident on the spots in the passenger compartment as light rays of two kinds of intensity, light α and light β, and flickering occurs, which causes occupant flicker. There was a problem that it caused discomfort.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to solve the above-mentioned problems and provide a light-shielding device for a vehicle capable of adjusting the light transmittance of a light beam entering the passenger compartment without causing discomfort to an occupant. And

[0005]

A fixed light-shielding member, which is fixedly supported by a vehicle body and shields a light beam entering a vehicle interior, and a movable light-shielding member movably supported with respect to the fixed light-shielding member, In a light shielding device for a vehicle, wherein the fixed light shielding member and the movable light shielding member are overlapped with each other to adjust the light transmittance of a light ray incident into a vehicle compartment, the fixed light shielding member and the movable light shielding member each emit a light ray in a predetermined direction. The movable light shielding member is rotationally driven with respect to the fixed light shielding member to gradually change the light distribution direction of the polarizing portion of the movable light shielding member.

[0006]

According to the present invention, the fixed light-shielding member and the movable light-shielding member are overlapped with each other to adjust the light transmittance of the light beam entering the vehicle interior. The fixed light-shielding member and the movable light-shielding member are respectively arranged in predetermined directions. It has a polarizing part for distributing light rays. Then, the movable light shielding member is rotationally driven with respect to the fixed light shielding member. Therefore, the light distribution direction of the fixed light shielding member and the light distribution direction of the movable light shielding member gradually change from the parallel direction to the orthogonal direction due to the rotation. Thus, the light rays entering the vehicle interior can be adjusted uniformly and gradually.

[0007]

As described above, according to the present invention, since it is possible to adjust the light rays entering the vehicle cabin uniformly and gradually, it is possible to adjust the incident light rays to have a mottled pattern. It has an excellent effect that the light transmittance of light rays can be adjusted without causing flicker and discomfort to passengers.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 shows a schematic overall configuration view of a glass roof device M for a vehicle to which an embodiment of the present invention device is applied, as seen from above the vehicle.

The glass roof device M of this embodiment is provided with a vehicle body 3
The fixed light-shielding member 1 fixedly supported by the fixed light-shielding member 1 for shielding the light entering the vehicle interior, and the movable light-shielding member 2 movably supported with respect to the fixed light-shielding member 1, In a glass roof device M for a vehicle that overlaps with the movable light blocking member 2 to adjust the light transmittance of the light beam entering the vehicle interior, the fixed light blocking member 1 and the movable light blocking member 2 each emit a light beam in a predetermined direction. As a configuration having polarizing films 10 and 20 for distributing light, the movable light shielding member 2 is rotationally driven with respect to the fixed light shielding member 1 to gradually change the light distribution direction of the polarizing film 20 of the movable light shielding member 2. There is.

The present embodiment will be described in more detail below. The glass roof device M is arranged in the ceiling portion of the vehicle body 3 so as to correspond to an opening 5 that is opened in a substantially rectangular shape, and the fixed light shielding member 1 is fixedly supported in the opening 5 by a waterproof structure such as a weather strip. ing. The movable light blocking member 2 is rotationally driven in the forward and reverse directions with respect to the fixed light blocking member 1 by an electrostatic actuator described later.

As shown in FIGS. 2 and 6, the fixed light-shielding member 1 has a polarizing film 10 on which light rays are incident in the front-rear direction of the vehicle, which is attached to the lower surface of a quadrangular tempered glass 11 corresponding to the opening 5 by an adhesive. A film-shaped transparent electrode 30 is attached to the lower surface of the polarizing film 10 after being bonded. This transparent electrode 3
0 is, for example, polyethylene terephthalate (abbreviation PE)
A transparent conductive material is vapor-deposited on the film of T).

As shown in FIGS. 3 and 6, the movable light-shielding member 2 has a substantially fan shape, and is supported so as to be rotatable about the axis O by 90 degrees. Further, the movable light-shielding member 2 has such a size and shape that it always overlaps with the entire quadrangular shape of the fixed light-shielding member 1 during its rotation. Furthermore, the movable light shielding member 2
Consists of an insulator 21 that is polarized by electrostatic induction,
For example, the above-mentioned PET or the like in the form of a sheet is used, and the insulating material of the insulator 21 has a resistance value of 10 ¹¹
10 ¹⁵ Ω is preferable, and 10 ¹³ Ω is preferable. A polarizing film 20 that distributes light so that light rays are incident in a predetermined direction is adhered to the lower surface of the insulator 21 with a transparent adhesive.

Regarding the support of the movable light-shielding member 2, FIG.
More specifically, with reference to FIG. 10, the shaft O provided so as to project from the fixed side of the vehicle body 3 or the fixed light shielding member 1 is loosely fitted in the hole 22 formed in the movable light shielding member 2 at the central position of the fan shape. A collar 23 is fixed to the hole 22 in order to reduce frictional resistance and prevent wear at a sliding portion with respect to the shaft O.

Next, an electrostatic actuator is applied in this embodiment as a driving device for rotating the movable light-shielding member 2, and its basic structure is disclosed in Japanese Patent Laid-Open No. 5-13078.
It is known from Japanese Patent Publication No. 4 etc., and will be briefly described here with reference to FIGS. 7, 8 and 11.

That is, the transparent electrode 30 attached to the fixed light-shielding member 1 is arranged radially around the axis O, and the three electrically independent electrode lines 32, 34 and 36 are the above film-like PET. It is vapor-deposited on. The specific structure of this electrode wire is shown in FIG. The portions of the electrode wires 32, 34, 36 that act on the driving force are formed to face the movable light-shielding member 2 in the same plane, and gradually widen in the radial direction from the axis O. Then, the electrode wires 32 are electrically independent.
34 and 36 are arranged alternately. In addition, the portions that act on the driving force of the electrode wires that are alternately arranged are the connection wire portions 3
They are connected by 6, 37 and 38. The connecting wire portions 37 and 38 of the electrode wire 32 and the electrode wire 36 have a three-layer structure with an insulating layer interposed therebetween.
In the portion that acts on the driving force of 6, the electrode layers 32, 34, and 36 are arranged in the same plane through the insulating layer through the through hole 33.

In such a structure, the electrode wires 32, 3
When pulse voltages of three phases of A phase, B phase, and C phase are applied to 4 and 36, respectively, the insulator 2 facing each of these electrode wires is applied.
Polarization occurs on the surface No. 1 due to electrostatic induction (state of FIG. 11). From this state, when the voltage applied to each electrode line is changed as shown in FIG. 12, the charges 43, 45, 47 generated in the insulator 21 by the polarization and the electrode lines 32, 34, 36 are attracted and attracted to each other. The movable light shielding member 2 that generates a repulsive force and is rotatably supported moves in the arrow X direction. Also,
When the voltage applied to each electrode wire is changed from the state shown in FIG. 12 to the state shown in FIG. 13, the movable light shielding member 2 moves in the arrow Y direction opposite to the arrow X in FIG.

As described above, the above-mentioned electrostatic actuator can be realized in a smaller space as a drive device for rotating the movable light-shielding member 2 of the glass roof device M in the forward and reverse directions, particularly in a ceiling portion of a vehicle. It is most suitable as a drive device for a part that needs to be made light and thin.

The operation of the above embodiment will be described below. In the glass roof device M having the above configuration, the state shown in FIG. 4, that is, the light distribution direction of the polarizing film 10 of the fixed light shielding member 1 (front and rear direction of the vehicle) and the light distribution direction of the polarizing film 20 of the movable light shielding member 2 are determined. Assume that they are in agreement. In this state, the light transmittance of the light rays entering the vehicle interior is maximum.

In this state of FIG. 4, when a command operation is performed to rotate the movable light shielding member 2 in the forward direction (direction of arrow X in FIGS. 4 and 12) by a switch (not shown), a pulse voltage is generated in the electrostatic actuator. 12 is applied. Then, the movable light shielding member 2 can be rotated from the state of FIG. 4 to the state of FIG. 5 within a range of approximately 90 degrees. Of course, the movable light shielding member 2 can be stopped midway by stopping the command operation by the switch.

At this time, since the fixed light shielding member 1 is fixedly supported by the vehicle body 3, the light distribution direction of the polarizing film 10 of the fixed light shielding member 1 (front and rear direction of the vehicle) and the polarizing film 2 of the movable light shielding member 2 are fixed.
The light distribution directions of 0 are orthogonal. For this reason, the rays of light that enter the passenger compartment are limited, and the light transmittance is lower than that in the state of FIG. Further, when the movable light shielding member 2 is in the state of being rotated from the state of FIG. 4 to the state of FIG. 5, the light distribution direction of the polarizing film 10 of the fixed light shielding member 1 and the movable light shielding member 2
The light distribution direction of the polarizing film 20 changes uniformly over the entire surface of the fixed light shielding member 1 and gradually from the parallel direction to the orthogonal direction. As a result, it is possible to gradually change the light transmittance of the light beam entering the vehicle interior.

As described above, in this embodiment described above, the light transmittance of the light beam entering the passenger compartment can be gradually changed, so that flicker does not occur and no occupant feels uncomfortable. . Moreover, it is possible to finely adjust the light transmittance of the light rays that enter the vehicle interior.

Next, another embodiment of the present invention will be described. However, the same components as those in the above embodiment will be described with the same reference numerals. Insulation material 21 used in the above examples
Depending on the material, it is difficult to maintain a predetermined resistance value because it is weak against humidity. Therefore, as shown in FIG.
The shielding member 50 has the transparent electrode 30 attached to its inner surface,
Together with the tempered glass 11, a closed state is formed. The polarizing film 10 is adhered to the inner surface of the tempered glass 11 in the ground direction with an adhesive. In addition, the transparent electrode 3 faces the transparent electrode 30.
The insulator 21 is movably arranged on the side of 0 in the top direction, and the polarizing film 20 is adhered to the surface of the insulator 21 on the side in the top direction with an adhesive to form the movable light shielding member 2.

As described above, since the polarizing film 10 and the transparent electrode 30 of the movable light shielding member 2 and the fixed light shielding member 1 are housed in the shielding member 50 in a sealed state, humidity, dust,
Not affected by dust etc. In addition, the movable light blocking member 2
Since its own weight acts in a direction in which the transparent electrode 30 and the insulator 21 approach each other, when the electrostatic actuator is driven, the transparent electrode 30 and the insulator 2 that have a large influence as a driving force are driven.
The gap with 1 can be kept smaller. That is,
Since the Coulomb force acting as a driving force is inversely proportional to the square of the distance between the transparent electrode 30 and the insulator 21, the gap is made smaller to obtain a larger driving force.

In the above embodiment, the fixed light-shielding member 1 has the polarizing film 10 adhered to the tempered glass 11. However, the present invention is not limited to this, and the tempered glass itself may have a polarizing effect. Further, the light distribution direction of the polarizing film 10 is the front-back direction of the vehicle, but this is an example, and the width direction of the vehicle can be set arbitrarily. Further, the shape and arrangement of the transparent electrodes 30 can be arbitrarily set.

[Brief description of drawings]

FIG. 1 is a schematic overall configuration diagram of a glass roof device for a vehicle to which an embodiment of the present invention device is applied, as seen from above the vehicle.

FIG. 2 is a plan view showing a polarizing film of a fixed light-shielding member portion of the one embodiment.

FIG. 3 is a plan view showing a polarizing film of a movable light-shielding member portion of the one embodiment.

FIG. 4 is a plan view showing a state in which the light transmittance of the one embodiment is maximum.

FIG. 5 is a plan view showing a state in which the light transmittance of the one embodiment is minimum.

FIG. 6 is a cross-sectional view of a main part showing a main part in a state where the fixed light-blocking member part and the movable light-blocking member part of the above-described embodiment are overlapped with each other.

FIG. 7 is a plan view showing a transparent electrode of the above embodiment.

8 is an enlarged view of an essential part in which the essential part Q of FIG. 7 is enlarged.

FIG. 9 is a plan view showing an insulator of the above-mentioned embodiment.

10 is a cross-sectional view taken along line HH of FIG.

FIG. 11 is a schematic configuration diagram showing an outline of the electrostatic actuator of the one embodiment.

FIG. 12 is an operation explanatory view for explaining forward rotation of the movable light shielding member by the electrostatic actuator of the one embodiment.

FIG. 13 is an operation explanatory view for explaining the reverse rotation of the movable light shielding member by the electrostatic actuator of the one embodiment.

FIG. 14 is a partial cross-sectional view of a glass roof device for a vehicle to which another embodiment of the device of the present invention is applied.

FIG. 15 is a schematic view of a conventional device for adjusting light transmittance.

16 is an explanatory view of a main part showing a main part of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed light-shielding member 2 Movable light-shielding member 3 Vehicle body 10,20 Polarizing film 11 Tempered glass 21 Insulator 30 Transparent electrode 32,34,36 Electrode wire M Glass roof device

Claims (1)

[Claims] 1. A fixed light-shielding member, comprising: a fixed light-shielding member that is fixedly supported by a vehicle body and shields a light beam that enters a vehicle interior; and a movable light-shielding member that is movably supported with respect to the fixed light-shielding member. In the light shielding device of a vehicle, wherein the movable light shielding member and the movable light shielding member are overlapped with each other to adjust the light transmittance of the light beam entering the vehicle interior, the fixed light shielding member and the movable light shielding member each distribute the light beam in a predetermined direction. A light shielding device for a vehicle, comprising a polarizing portion, wherein the movable light shielding member is rotationally driven with respect to the fixed light shielding member to gradually change the light distribution direction of the polarizing portion of the movable light shielding member.