JPS606920A - Antiglare device - Google Patents

Abstract

PURPOSE:To cut off incident light automatically on rear light condition by installing a plate type material which varies in light transmittivity with an applied voltage at the upper part of the windshield of a vehicle, and coupling it with a sunshine incidence angle sensor which is installed separately through a controller. CONSTITUTION:The liquid-crystal plate 5 which varies in light transmittivity with the applied voltage is provided to the upper part of the windshield 2, and the sensor which detects light incident through the windshield 2 is provided. When rear light which is the incident light enters the sensor 6 at an angle smaller than an angle theta, its photodetecting element 7 detects the incident light and the controller applies the voltage to the liquid-crystal plate 5 to decrease the light transmittivity of the liquid-crystal plate 5. Thus, the incident light is reduced to eliminate the sensation of glare.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an anti-glare device for vehicle drivers and passengers, and more specifically, an anti-glare device that utilizes the fact that the transmittance of light rays changes depending on the voltage applied to a liquid crystal panel. It is related to.

When the sun is low in the morning or evening, reflected light or reflected light caused by various conditions enters the driver's field of vision, making it extremely difficult to see what's ahead. It often happens.

Generally, in such cases, the driver takes anti-glare measures by frequently moving the sun visor up and down as necessary.

This will be explained in detail with reference to FIG. The figure shows the front of the vehicle, where 1 is the passenger (or the person being hit), 2 is the windshield, 6 is the sun (T, R, or other light source), and 4 is the sun visor. The position is stored at position α when the light beam does not directly enter the field of view of the passenger 1.

When the light beam came into the passenger's field of vision while the vehicle was in motion, the passenger 1 manually moved the sun visor 4 to position b to block the light in order to prevent the driver from checking the road surface thoroughly. .

According to this method, it is necessary for the passenger to manually operate the sun visor 4 every time the passenger feels it necessary, and especially when the passenger is the driver, his or her attention to driving operations is likely to be temporarily distracted. Further, when it is necessary to raise and lower the vehicle within a short period of time during long-term driving, it is not only cumbersome but also leads to accumulation of fatigue and poses a safety problem, which is not desirable.

The present invention has been made in order to eliminate the drawbacks of the conventional system as described above, and includes a sensor that detects incident light by installing a liquid crystal plate on the top of the windshield whose light transmittance changes depending on the applied voltage. This system combines a controller that outputs a voltage when the sensor is activated, and automatically blocks light from the passenger.

An embodiment of the present invention will be described below with reference to the drawings.

In Figure 2, the same numbers as in Figure 1 indicate the same items.
5 is a plate-like material, such as a liquid crystal plate, whose light transmittance can be changed depending on the applied voltage, and is installed on the upper part of the windshield 2. In addition, in FIG. 2, this plate-like material 5
is installed so as to hang down at the upper rear side of the windshield 2, but it goes without saying that it may be provided along the surface of the windshield 2.

Reference numeral 6 denotes a sensor for detecting the incident light beam passing through the windshield 2, and its structure is roughly as shown in FIG. It consists of 8 hoods.

Now, the angle between the horizontal line and the straight line connecting the viewpoint P of the passenger 1 and the upper part of the windshield Q is θ, and the hood shape of the sensor 6 is determined to be the same as this angle θ, and the sensor 6 is installed inside the vehicle. Position 1 where it receives sunlight: For example, install it on the top of the dash board.

Note that this sensor 6 and the liquid crystal plate 5 are electrically connected via a controller (not shown).

In the anti-glare device configured as described above, when backlight, which is incident light, enters the sensor 6 at an angle smaller than the angle θ, the light receiving element 7 detects the incident light, and the controller sends the liquid crystal plate 5 A voltage is applied to the liquid crystal plate 5, thereby lowering the light transmittance of the liquid crystal plate 5. As a result, the amount of incident light is reduced and no glare is felt.

On the contrary, when the angle of incidence of the light beam is greater than θ and the passenger does not feel any glare, there is no incident light on the light receiving element 7 of the sensor 6, so the voltage applied to the liquid crystal is zero, and the voltage applied to the liquid crystal is zero. The light transmittance is high and does not obstruct the forward view.

In addition, in this example, the installation location of the sensor 6 and the viewpoint P of the passenger 1 are
Although the position of the sensor 6 is different, since the sun, which is the main target incident light, is at an infinite distance, there is no problem in detecting the angle of incidence by the sensor 6.

In addition, in this embodiment, a liquid crystal plate was used as a device for changing the light transmittance, but 1. It goes without saying that similar effects can also be obtained by using an electrochromic cell, for example.

Further, in this example, the hood 8 is used as a method of determining the angle of incidence of the sensor 6, but it is of course possible to use the hood 8 as a convex lens.

As described above, the present invention automatically blocks incident light when backlit, reducing the burden on passengers. In particular, the driver does not need any extra operations when backlit, and can operate the vehicle without feeling glare. This has a significant effect on safety because it allows you to concentrate on your work.

[Brief explanation of the drawing]

Fig. 1 is a partial side view illustrating a conventional method of blocking incident light, Fig. 2 is a partial side view illustrating a shading method according to an embodiment of the present invention, and Fig. 6 is a sensor used in the present invention. FIG. 1 is a passenger, 2 is a striped windshield, 6 is the sun, 4 is a sun visor, 5 is a liquid crystal plate, and 6 incident angle sensors. In the figures, the same reference numerals indicate the same parts. Agent Masuo Oiwa

Claims (1)

[Claims] A plate-like material whose light transmittance changes depending on the applied voltage is installed on the upper part of the windshield of the vehicle, and a sunlight incidence angle sensor installed separately and a controller that outputs a voltage when the sensor is activated are installed. An anti-glare device that indicates that it has been combined.