JPH06340218A - Sunvisor for vehicle - Google Patents

Abstract

PURPOSE:To enable the confirmation of a signal light even in the case of a vehicle being stopped directly under a traffic light by providing a power supply for applying the electric field to a dimming film with a high polymer - liquid crystal compound film. CONSTITUTION:A high polymer - liquid crystal compound film 2 is held between the ITO transparent electrode 10 and ITO transparent electrode 10' of transparent PET films 1, 1 with ITO transparent electrodes farmed. AC exciting voltage is applied between the ITO transparent electrodes 10, 10' from a vehicular power supply 5 of DC 12v through an applied voltage regulating resistance 4 and a DC-AC converter 3. The transmittance adjustment of visible light of the high polymer - liquid crystal compound film 2 is controlled according to the intensity of outside light. That is, in the case of outside light being dazzling, the electric field applied to the high polymer - liquid crystal compound film 2 is adjusted to make the transmittance of visible light about 10% so that a signal can be confirmed even in the case of a vehicle being stopped directly under a traffic light.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle sun visor, and more particularly to a vehicle sun visor provided with a light control film having a polymer / liquid crystal composite film.

[0002]

2. Description of the Related Art A conventional example will be described with reference to FIG. The mechanical sun visor 51 included in the vehicle 50 is generally
Corresponding to the inside upper part of the windshield 53, it is rotatably supported and installed on a support shaft 52 attached to the vehicle body of the vehicle 50. When external light entering the vehicle from the front is dazzling, this is installed. It is rotated downward by manual operation to block external light.

[0003]

Since the above-mentioned mechanical sun visor 51 is designed to rotate this downward so as to block outside light incident on the inside of the vehicle from above the front, the vehicle is directly below the traffic signal. When the vehicle stops and the direction of the signal light coincides with the direction of external light, it may not be possible to check the signal light.

The present invention solves the above-mentioned problems by providing the sun visor with a light control film having a polymer / liquid crystal composite film.

[0005]

A vehicle sun visor having a light control film having a polymer / liquid crystal composite film 2 and a power source 5 for applying an electric field to the light control film is constructed. Then, a vehicle sun visor was constructed in which the polymer / liquid crystal composite film 2 was of a type that was transparent when the applied electric field was on and opaque when the applied electric field was off.

Further, the type of the polymer / liquid crystal composite film 2 is
A vehicular sun visor was constructed that was transparent when the applied electric field was off and opaque when the applied electric field was on. Further, the light control film constitutes a vehicle sun visor which is formed on the mechanical sun visor 51 of the vehicle 50.

The light control film constitutes a vehicle sun visor which is formed on the windshield 53 of the vehicle 50. Further, a vehicle sun visor is constructed in which the visible light transmittance of the polymer / liquid crystal composite film 2 is adjusted by steplessly controlling the applied voltage according to the external brightness. Further, a vehicular sun visor was constructed in which the transmittance of visible light of the polymer / liquid crystal composite film 2 was adjusted to about 10%.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle sun visor according to the present invention will be described with reference to FIG. In FIG. 1, (a) is a front view of a sun visor including a light control film having a polymer / liquid crystal composite film, and (b) is a view for explaining a cross section and an electric circuit for applying a voltage. is there.

Reference numerals 1 and 1 ′ are transparent PET films having a transparent electrode made of ITO.
0'is the ITO transparent electrode. Reference numeral 2 denotes a polymer / liquid crystal composite film, which is sandwiched and bonded between the ITO transparent electrode 10 and the ITO transparent electrode 10 ′ of the transparent PET films 1 and 1 ′ having the ITO transparent electrode formed thereon. Reference numeral 3 is a DC-AC converter, 4 is an applied voltage adjusting resistor, and 5 is a vehicle power source of DC 12v. The voltage value of DC 12v of the vehicle power supply 5 is adjusted by the applied voltage adjusting resistor 4 in the range from 0v to 12v, and this voltage is converted into an alternating voltage by the DC-AC converter 3. After all, the ITO transparent electrode 10
Between the ITO transparent electrode 10 'and the above-mentioned DC 12v
From the vehicle's power source 5 to the applied voltage adjustment resistor 4 and DC-AC
An AC excitation voltage is applied through the converter 3, and the visible light transmittance of the polymer / liquid crystal composite film is determined according to this voltage value. In order to adjust the applied voltage, a photo sensor is attached to the windshield instead of the adjusting resistor 4, and the transmittance of the polymer / liquid crystal composite film is adjusted according to the intensity of external light entering the photo sensor. You can also do it.

In order to control the visible light transmittance of the polymer / liquid crystal composite film, the applied voltage is manually or automatically, stepwise or steplessly according to the intensity of external light incident from the outside. It is carried out by controlling Polymer according to this invention
A vehicle sun visor equipped with a light control film having a liquid crystal composite film adjusts the electric field applied to the polymer / liquid crystal composite film when external light entering the vehicle from the front is dazzling, and transmits visible light. Is set to about 10% so that the signal lamp can be confirmed even when the vehicle stops immediately below the traffic signal due to about 10% of the transmitted light. And
An appropriate transmittance is always set for the intensity of external light incident on a vehicle so that the driver can always drive in an appropriate and easy-to-see state. When the external light is weak, the polymer
Adjust the electric field of the liquid crystal composite film to increase the transmittance and make it easier to see.

An application example of the sun visor of the present invention will be described. A vehicle sun visor provided with a light control film having a polymer / liquid crystal composite film according to the present invention is a mechanical sun visor 51 provided in a vehicle 50 shown in FIG.
It is possible to form a light control film on the substrate. Then, as shown in FIG. 2, the sun visor according to the present invention can be configured on the inner upper portion 21 of the windshield 53 of the vehicle 50, which will be described here.

The light control film illustrated and described with reference to FIG. 1 can be easily constructed by bonding it to the inner upper portion 21 of the windshield 53 of the vehicle 50. It is also possible to form an ITO transparent electrode on the upper inside of the windshield 53, and to bond a transparent conductive film having a polymer / liquid crystal composite film formed on it to the ITO transparent electrode on the upper inside of the windshield. Can be configured.

The materials used for forming the polymer / liquid crystal composite thin film are as follows. Polymer Material (P) Thermoplastic Polyimide Liquid Crystal (LC) BL015 (manufactured by BDH) Solvent (C) N-Methylpyrrolidone The mixing ratio of the materials is as follows.

LC / (P + LC) = 0.8 C / P = 5

[0015]

As described above, the vehicle sun visor of the present invention provided with the light control film having the polymer / liquid crystal composite film can be used even when external light entering the vehicle from the front is dazzling. It does not block light completely. High molecular·
The electric field applied to the liquid crystal composite film is adjusted so that the transmittance of visible light is about 10%, and the signal light can be confirmed even when the vehicle stops just below the traffic signal due to the transmitted light of about 10%. .

Further, the transmittance of visible light of the polymer / liquid crystal composite film is adjusted by controlling the applied voltage steplessly according to the brightness of the outside, so that the intensity of the outside light incident on the vehicle is adjusted. It is possible to always set an appropriate transmittance and always operate in an appropriate easy-to-see state. When the external light is weak, the electric field of the polymer / liquid crystal composite film can be adjusted to increase the transmittance and make it easier to see.

[Brief description of drawings]

FIG. 1 is a diagram illustrating an embodiment of the present invention, (a)
FIG. 3A is a front view of a sun visor including a light control film having a polymer / liquid crystal composite film, and FIG. 6B is a view illustrating a cross section and an electric circuit for applying a voltage.

FIG. 2 is a diagram illustrating an application example of the sun visor of the present invention.

FIG. 3 is a diagram illustrating a conventional example of a sun visor.

[Explanation of symbols]

 1, 1'Transparent PET film 2 Polymer / liquid crystal composite film 3 DC-AC converter 4 Applied voltage adjustment resistance 5 Power supply 10, 10 'ITO transparent electrode 21 Inner upper part 50 Vehicle 51 Mechanical sun visor 53 Windshield

Claims (7)

[Claims] 1. A vehicle sun visor comprising a light control film having a polymer / liquid crystal composite film, and a power source for applying an electric field to the light control film. 2. The vehicle sun visor according to claim 1, wherein the polymer / liquid crystal composite film type is transparent when an applied electric field is on and is transparent when an applied electric field is off. An opaque sun visor for vehicles. 3. The vehicle sun visor according to claim 1, wherein the polymer / liquid crystal composite film type is transparent when the applied electric field is off and is applied when the applied electric field is on. An opaque sun visor for vehicles. 4. The vehicle sun visor according to claim 1, wherein the light control film is formed on a vehicle mechanical sun visor. 5. The vehicle sun visor according to claim 1, wherein the light control film is formed on a windshield of the vehicle. 6. The vehicle sun visor according to claim 1, wherein the visible light transmittance of the polymer / liquid crystal composite film is controlled steplessly by an applied voltage according to the external brightness. Adjustable vehicle sun visor. 7. The vehicle sun visor according to claim 1, wherein the visible light transmittance of the polymer / liquid crystal composite film is adjusted to about 10%.