JPS62205818A - Sunvisor having variable light transmission - Google Patents

Abstract

PURPOSE:To always obtain satisfactory glare-proof effects, by detecting light leaking from a part on the surface of a front windshield pane which may not be covered with a movable sunvisor, with the use of a photosensor to reduce the light transmission of a variable light transmission panel. CONSTITUTION:A variable light transmission type panel 11 having a transparency which is reduced by the action of liquid crystal disposed therein and electrically operated, is laid on the surface of a front windshield in the upper edge part of the center section of the front windshield pane which may not be covered with a movable sunvisor. Further, a photo-sensor composed of a photo-transistor Q1 is attached to the upper edge part of one side section of the front windshield pane. When light is incident upon the photo-sensor Q1, if a voltage at a non-reversible input terminal of a comparator CMP exceeds a predetermined value while switches S1, S2 associated with a head light turn-on switch and a wiper operating switch are both turned off, the transistor Q1 is turned on, resulting in energization of the variable light-transmission panel 11 by means of a liquid crystal drive circuit, to reduce the light transmission of the panel.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a sun visor attached to a vehicle, and particularly to a movable sun visor attached to a conventional vehicle. This invention relates to a sun visor that covers a windshield surface that cannot be covered by a sun visor.

(Prior Art) Conventional movable sun visors include those shown in FIGS. 4a, 4b, and 4c.

FIG. 4a shows a movable sun visor of the two-axis rotation type. Since the movable sun visor of two-axis rotation type rotates around the X-axis and the Y-axis, it can cover the upper edges of the windshield and door window glass as necessary.

FIG. 4b shows a movable sun visor of the uniaxial rotation type. A movable uniaxially rotating sun visor can freely select the mounting position of the hinge part, so it functions best as a sun visor when the curvature around the windshield is large.

Figure 4c shows a movable sun visor of the universal joint type. Universal joint type movable sun visors often use ball joints and are used on buses and trucks with high ceilings and large window areas.

(Problems to be Solved by the Invention) There are nine conventional movable sun visors, one on the driver's seat side and two on the passenger's seat side, but as shown in Fig. 5, the movable sun visors are provided in the center of the windshield. There are gaps where this cannot be done. For this reason, conventional movable sun visors prevent sunlight leaking through the gap in the center of the windshield from hitting drivers while driving,
There was a problem with the passenger sitting in the passenger seat.

Therefore, the technical problem of the present invention is to construct a sun visor that covers the gap in the windshield that cannot be covered by conventional movable sun visors.

[Structure of the invention]

(Means to solve the problem) The technical measures taken to solve the above technical problem are:
The conventional sun visor includes: a variable amount of light transmission panel that is attached to the windshield surface that cannot be covered by the movable sun visor and that can arbitrarily change the amount of light transmitted; and a variable light transmission panel that is attached to the windshield surface. A photo sensor that detects the amount of incident light,
A switch means for detecting the state of the vehicle, the photo sensor, and the switch means are connected to each other, and the amount of light transmitted through the variable light transmittance panel is changed depending on the amount of light incident on the destination and the state of the vehicle. This is because a control circuit is provided.

(Function) According to the configuration of the present invention, light leaks from the gap in the windshield surface that cannot be covered by the movable sun visor.
If the light hits the driver or passenger in the passenger seat, a photo sensor detects that the light is leaking.
Further, the state of the vehicle is detected by a switch means, and the amount of incident light and the state of the vehicle are determined by the photosensor and a control circuit connected to the switch means,
The light is blocked by reducing the amount of light transmitted by the translucent variable panel attached to the windshield.

(Example) The present embodiment will be described below based on the drawings.

FIG. 1 is a perspective view depicting a variable light transmission amount panel 11 of the present invention. The variable amount of light transmission panel 11 is curved and shaped according to the curvature of the windshield.

The variable amount of light transmission panel 11 includes one in which a transparent electrode 15 is vapor-deposited on a transparent substrate 14, and one in which a transparent electrode 17 is vapor-deposited on a transparent substrate 18, on both end surfaces of a spacer 16 with a cross-section opening at both ends. The transparent electrodes 15 and 17 are joined so as to face each other, and a liquid crystal is sealed inside.The liquid crystal used in this example does not contain beads made of a transparent material. This prevents the transparent electrodes 15 and 17 from coming into contact even when the variable light transmission amount panel 11 is bent.

Transparent electrodes 15 and 17 are electrodes 12 and 13, respectively.
When a voltage is applied between the electrodes 12 and 13, the light transmission amount variable panel 11 changes due to the action of the internal liquid crystal.
opacity decreases.

As shown in FIG. 2, the above-mentioned variable amount of light transmission panel 11 is disposed at the upper edge of the central portion of the windshield surface that cannot be covered by the movable sun visor.

The electrodes 12 and 13 of the variable light transmission amount panel 11 are connected to the control circuit shown in FIG. 3 via a liquid crystal drive circuit (not shown).

In this embodiment, a phototransistor Q1 is used as a photosensor, and the phototransistor Q1 is attached to the upper edge of the side edge of the windshield. In this embodiment, the phototransistor Q1 is internally connected to other transistors in a Darlington manner, and has increased sensitivity to light. Phototransistor Q
The collector of No. 1 is directly connected to the power supply Vc, and the emitter is grounded via a resistor R1. When light is incident on the phototransistor Q1, ventilation occurs between the collector and emitter, and a voltage proportional to the incident light is generated across the resistor R1. One end of the resistor R1 is connected to a non-inverting input terminal of the comparator CMP, and a voltage proportional to the incident light generated across the resistor R1 is input to the non-inverting input terminal of the comparator CMP.

A resistor R2 and one end of a variable resistor R3 are connected to the inverting input terminal of the comparator CMP. Resistance R2
The other end is connected to the power supply Vc, the other end of the variable resistor R3 is grounded, and the voltage divided by the resistor R2 and variable resistor R3 is inputted to the inverting input terminal of the comparator CMP as a set voltage.

A feedback resistor R4 is connected between the output terminal of the comparator CMP and the non-inverting input terminal, and together with the resistor R1, the comparator CMP has hysteresis characteristics. In this circuit, hunting near the set voltage is prevented by giving the comparator CMP a hysteresis characteristic. Further, the output terminal of the comparator CMP is connected to one of the input terminals of the three-man power AND gate G1. Input terminal and power supply V of three-person gate GL
Resistors R5, R6, and R7 are connected between cO.

Resistors R5, R6, and R7 are provided to pull up the input terminal of the three-man power AND game 1-Gl. The input terminals of the remaining two three-person gates GI are
Each switch S is linked to the headlight switch.
1, and switch S2 linked to the wiper switch
is connected at one end. The other ends of the switch S1 and the switch S2 are both grounded. A resistor R8 is connected between the input terminal of the three-power AND gate Gl and the power supply VcO. Resistor R8 is provided to supply base current to transistor Q2. The output of the three-power AND gate G1 is transmitted via a resistor R9 to a transistor Q2 for driving a liquid crystal drive circuit (not shown).
The base number is entered. One end of resistor R9 is resistor RIO
is grounded through. The resistor RIO is for ensuring a noise margin when the transistor Q2 is off. The emitter of the transistor Q2 is grounded, and the output is taken out from both ends of a resistor R11 connected between the collector and the power supply Vc.

Input terminals of a liquid crystal drive circuit (not shown) are connected to both ends of the resistor R11, and drive the liquid crystal of the variable light transmission amount panel 11 according to signals generated at both ends of the resistor R11. When light is incident on the phototransistor Q1 and the voltage at the non-inverting input terminal of the comparator CMP exceeds the set voltage manually input to the inverting input terminal of the comparator CMP, the power supply voltage Vc is output to the output terminal of the comparator CMP, 3
One of the input terminals of Gl becomes "H". At this time, if switch S1 linked to the headlight lighting switch is on, one of the input terminals of Gl becomes "L", and the liquid crystal drive circuit (not shown) becomes "L" regardless of the state of the other input terminals. do not drive. This state occurs when it is determined that the vehicle is traveling at night. Similarly, if the switch S2 linked to the wiper operating switch is on, one of the input terminals of the three-person gate Gl becomes "L", and the liquid crystal drive circuit (not shown) becomes "L" regardless of the state of the other input terminals. ). This state occurs when it is determined that the vehicle is running in the rain. That is, only when a predetermined amount of light is incident on the phototransistor Q1 when the switch Sl and the switch S2 are off, the transistor Q2 is turned on, and a ground voltage is output to the liquid crystal drive circuit (not shown). A liquid crystal driving circuit (not shown) reduces the amount of light transmitted through the variable amount of light transmitted panel 11.

Conversely, when the voltage at the non-inverting input terminal of the comparator CMP does not exceed the set voltage, the ground voltage is output to the output terminal of the comparator CMP, and the switch S1, which is linked to the headlight lighting switch, and the wiper operating switch are linked. Since transistor Q2 is turned off regardless of the state of switch S2, the liquid crystal drive circuit (not shown)
A power supply voltage Vc is outputted to the liquid crystal drive circuit (not shown), and the amount of light transmitted through the variable light transmission panel 11 is increased.

Further, by changing the resistance value of the variable resistor R3, it is possible to change the set voltage at which the amount of light transmitted through the transparent variable panel 11 changes.

In the embodiment of the present invention shown in FIG. 1, by changing the resistance value of the variable resistor R3 of the control circuit shown in FIG. By changing the brightness, the amount of light transmitted through the variable light transmission amount panel 11 can be changed according to the driver's preference.

The translucent variable mold panel 11 used in this example was manufactured with the following dimensions to match the shape of the windshield of the vehicle.

Curvature R = 4800 (mm) Height H - 80 (mm) Width w = 300 (MM) [Effects of the Invention] The sun visor of the present invention allows light to pass through the gap in the windshield that cannot be covered by conventional movable sun visors. Since it is covered by a variable volume panel, sunlight leaking through the gap in the center of the windshield will not hit the driver or passenger in the front seat. Furthermore, since the photosensor automatically detects the amount of incident light and the translucent variable panel blocks the incident light, it does not interfere with the driver's movements.

Furthermore, since the translucent variable panel does not cover the entire windshield, it can be easily installed on conventional vehicles.
Moreover, it is low cost. In addition, the state of the vehicle is automatically determined according to the state of the switch means, and the variable light transmission amount panel is not driven when there is no need to block the incident light from the windshield, which not only saves power. Therefore, the life of the variable light transmission panel can be extended.

Further, the variable light transmitting amount panel is not driven when driving the variable light transmitting amount panel may impede visibility, such as at night.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a variable light transmission panel of the present invention, and FIG. 2 is a perspective view of the variable light transmission panel shown in FIG. 1 attached to a windshield. FIG. 3 is a circuit diagram showing a control circuit of the present invention. Figure 4a is a perspective view showing a conventional two-axis rotating type movable sun visor, Figure 4b is a perspective view showing a conventional single-axis rotating type movable sun visor, and Figure 4C is a conventional universal joint type movable sun visor. It is a perspective view showing a sun visor. FIG. 71 is a diagram depicting a vehicle using a conventional movable sun visor. 11... Variable amount of light transmission panel, 12.13... Electrode,
14.18...Transparent substrate, 15.17...Transparent electrode, 16...Spacer, Ql...Phototransistor (photosensor), CMP...Comparator, G1...
・3 person Kaand gate

Claims (1)

[Scope of Claims] A vehicle having a windshield and a movable sun visor capable of covering a part of the upper part of the windshield when in use, wherein the movable sun visor is attached to a surface of the windshield that cannot be covered. a variable light transmission panel that can arbitrarily change the amount of light transmitted; a photosensor that is attached to the windshield surface and detects the amount of incident light; a switch means that detects the state of the vehicle. and; a control circuit that is connected to the photosensor and the switch means and changes the amount of light transmitted through the variable light transmission amount panel according to the amount of incident light and the state of the vehicle. A sun visor with variable amount of light transmission.