JP3688637B2 - Sun visor device for automobile - Google Patents

Description

[0001]
[Industrial application fields]
This relates to an automobile sun visor device (anti-glare device).
[0002]
[Prior art]
Conventionally, the sun visor device of an automobile has an opaque plate-like thing in the driver's seat and the passenger seat. When the sun is dazzling, the driver moves the sun visor by hand so that the sun is not directly on his eyes. However, when the driver turns the steering wheel, the position where the light enters changes, so the driver must adjust the sun visor position each time. This can lead to dangerous situations such as releasing your hand from the steering wheel while driving and moving your line of sight to the sun visor. Ordinary sun visors have drawbacks such as being completely opaque and invisible.
[0003]
[Problems to be solved by the invention]
The present invention solves these drawbacks. Even if the driver turns the steering wheel freely, the LCD film attached to the front window responds instantly and is anti-glare.
[0004]
[Means for Solving the Problems]
In the present invention, a liquid crystal film is pasted or encapsulated in the front window. Light similar to the light entering the driver's eyes is detected by light sensors attached to the rear mirror, front dashboard, headrest, etc. Based on this detected signal, the light transmittance of each part of the liquid crystal film is automatically changed by the liquid crystal film controller. In this way, the driver can easily maintain good visibility in each direction without removing his hand from the steering wheel.
[0005]
【Example】
Fig. 1 is a block diagram of the device of the present invention. A liquid crystal film 2 is attached to the interior of the front window 1 of the car. Outside light such as sunlight 3 passes through the front window 1 and the liquid crystal film 2 and enters the eyes 5 of the driver 4. The viewing angle of the vertical plane of eye 5 is 2γ. The light sensor 7 attached to the room mirror 6 detects outside light. The viewing angle of the sensor is 2θ. Figure 2 shows the configuration of the optical sensor. Let the diameter of the entrance 8 of the optical sensor 7 be d. The photoelectric surface 9 of the sensing unit is divided into four, and photoelectric devices 10, 11, 12, 13 such as photo sensors are installed in each. If the radius a of the photocathode 9 and the distance from the entrance 8 of the photocathode 9 are b, the viewing angle 2θ of the optical sensor 7 is calculated from the value a−b.
[0006]
a = d / 2, tan θ = a / b
If 2 times θ obtained here and 2γ are matched, an ideal sensor is obtained. θ can be set freely by adjusting b. Find the horizontal plane in the same way. FIG. 3 is a block diagram of the control device 14. The signals of photoelectric devices 10 to 13 are added to the calculator 15 to perform necessary calculations and instructed to the liquid crystal film controller 16. <I + II + III + IV> in Fig. 3
This calculation is based on the received light intensity . Also,
<(I + II)-(III + IV)>
Can be used to determine the incident direction of light up and down. Other,
<(I + IV)-(II + III)>
Can be used to determine the incident direction of light on the horizontal plane. The liquid crystal film controller 16 controls the transmittance of each part of the liquid crystal film 2 based on the above calculation result.
[0007]
[Other Embodiment 1]
When retrofitting the shape of the rearview mirror or this system, if it is difficult to attach the optical sensor 7 to the rearview mirror 6, there is a method of attaching the optical sensor 7 to the front dashboard 17 as shown in FIG. .
[0008]
[Other embodiment 2]
If a plurality of optical sensors 7 are arranged on the headrest 18 in FIG. 1, the detection accuracy for the light source 3 is improved because the sensors are close to the position of the driver's eyes 5. The light sensor 7 is placed on the left and right of the headrest. Even if the input to one sensor is blocked at the driver's 4 head position, the other sensor functions and keeps the sensor operating normally, improving reliability.
[0009]
[Other Example 3]
In addition to sticking the liquid crystal film in the cab of the front window, it can also be sealed in the front window in advance.
[0010]
【The invention's effect】
Or more, the external light such as light of sun as described is so dazzling the driver enters the eyes of the driver, automatically each part of the liquid crystal film are installed in the front window is the optimum transmittance, glare Decrease. Because the anti-glare material is liquid crystal, it can be used at higher speeds than when the sun visor is driven mechanically. In addition, there is no discomfort to the driver because there is no mechanical noise associated with the operation. In addition, the transmittance can be changed step by step depending on the size of the external light, so the visibility of the outside world is not significantly impaired. In addition, by installing the optical sensor at the optimum position, a highly accurate and reliable device can be created.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a device according to the present invention.
[Figure 2] Configuration diagram of the optical sensor.
[Fig. 3] Block diagram of the control device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1; Front window, 2; Liquid crystal film, 3; Light source, such as the sun, 4; Driver | operator, 5; Driver | operator's eyes, 6; Room mirror, 7; Photosensor, 8; Sensor light receiving unit 10, 11, 12, 13; photoelectric device, 14; control device, 15; arithmetic unit, 16; liquid crystal film controller, 17; dashboard, 18;

Claims (4)

Attach a liquid crystal film to the front window of the car,
A light sensor with a viewing angle relatively matched to the driver's eye viewing angle is installed in the passenger compartment,
This light sensor detects the light source that causes glare such as sunlight and drives the liquid crystal film based on the detection signal that is output to reduce the light transmittance between the light source and the driver's eyes. Anti-glare,
The light receiving surface of the photosensor is divided into a plurality of cells, and a photoelectric device is attached to each of the cells,
An automobile sun visor apparatus that optimally controls the liquid crystal film by performing arithmetic processing on a signal of the device. The light receiving surface of the optical sensor is divided into two parts in the horizontal direction with respect to the horizontal plane of the automobile and two parts in the vertical direction, and is composed of four cells arranged corresponding to each light receiving surface. ,
2. The automobile sun visor device according to claim 1, wherein the received light intensity is obtained by calculating the sum of the received light signals output from the four cells.   Among the light reception signals output from the four cells, the light reception of the two cells arranged in the horizontal direction and the lower side from the sum of the light reception signals of the two cells arranged in the horizontal direction and the upper side. 3. The vehicle sun visor device according to claim 2, wherein the vertical incident direction of light is determined by subtracting the sum of signals.   Of the light reception signals output from the four cells, two cells arranged on the right side in the vertical direction from the sum of the light reception signals of the two cells arranged on the left side in the vertical direction 4. The vehicle sun visor device according to claim 2, wherein the incident direction of light in a horizontal plane is determined by subtracting the sum of the received light signals.

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