JPS6250222A - Sun visor for vehicle - Google Patents

Abstract

PURPOSE:To regulate an amount of incident light transmitted to a car room and to improve safety during running, by a method wherein two polarized light films different in a polarized light direction are superposed with each other, at least the one is moved, and a superposing position is moved according to the intensity of light. CONSTITUTION:Beltlike polarized films (a) and (b), being 90 deg. different in a polarized light direction from each other and coloured in blue, are alternately laminated at a distance between polarized light films (a) or the polarized light films (b) to each of two clear plates of the one being a plate 1 on the moving side and the other being a plate 2 on the stationary side. When the polarized light films (a) or the polarized light films (b) on the two plates 1 and 2 are supposed with each other, an amount of light depending upon the respective polarized light rate and transmissivity of each of the polarized light films (a) and (b) is caused to pass, and when the moving plate is displaced by a distance to superpose (a) with (b) and (b) with (a), light becomes difficult to pass. As a result, through variation of the polarized light rate and the transmissivity of the polarized light films (a) and (b) and relative regulation of the two plates 1 and 2, a whole amount of light transmitted can be regulated. The regulation is automatically effected by a photo sensor, and this enables production of a glareproofing effect.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sun visor for a vehicle that can adjust the amount of light transmitted.

[Conventional technology]

2. Description of the Related Art As is well known in the art, automobiles are equipped with sun visors to prevent sunlight from directly entering the driver's eyes when the vehicle is driving toward the setting or rising sun.

[Problem that the invention seeks to solve]

However, since the conventional ones are designed to completely block sunlight, there is a problem that the field of view becomes narrow when in use.Also, the ones made of translucent plastic are
Although this method has the effect of simply softening the light, it cannot change the amount of light transmission step by step.

The present invention has been made in order to solve the problem described in "-", and its technical problem is to make it possible to adjust the amount of light that passes through the vehicle window and enters the passenger compartment.

[Means for solving problems]

In order to achieve the above-mentioned technical problem, the present invention provides a light shielding member that blocks light rays entering the vehicle interior from the upper part of the vehicle window, supports this light shielding member on the window upper part, and eliminates the need for light shielding. A support member for moving the light shielding member to the ceiling of the vehicle when the light shielding member is not in use, and a support member for moving the light shielding member to the ceiling of the vehicle. A technical means is employed in which two sheets are stacked one on top of the other, at least one is made into a movable plate, and the light transmittance is adjusted as the movable plate moves.

[Action/effect of the invention]

By employing the above technical means, when the light entering the vehicle interior is weak, a slight light blocking effect can be obtained by adjusting the position of the movable plate so that the polarizing films of the two plates do not overlap each other. Further, when the light entering the vehicle interior is strong, by adjusting the movable plate so that the polarizing films of the two plates overlap each other, a severe light blocking effect can be obtained.

In this way, the amount of light transmitted can be adjusted according to the intensity of the light.
In addition, since it does not completely block light, it can eliminate glare without narrowing the actual field of view of the vehicle window, so it can be used as a sun visor for cars to improve driving safety. effective.

〔Example〕

Hereinafter, the present invention will be explained based on illustrated embodiments. 1st
The figure shows the basic structure of the light transmission amount adjustment function according to the present invention, and 1 indicates the movable side plays 1 to . 2 indicates a fixed side plate, each of which is a transparent plate a.

Band-shaped polarizing films colored blue in b are alternately pasted at predetermined intervals l (in this example, 5 cm), and in this case, the polarizing films a and b differ in polarization direction by 90 degrees. Therefore, the polarizing films a, l of both plates 1 and 2! :a,b
When and b overlap, the light passes through the polarizing film a.

The amount of light corresponding to the polarization rate and transmittance of each b passes through, and the movable side plate is shifted by 1 to obtain a. When b and a are superimposed, the light is different from the above case! It will be difficult to pass the time. In this case, the amount of light transmitted can be freely set by changing the polarization factor and transmittance of the polarizing film. Further, by adjusting the relative movement amount of both plates, the overall amount of light transmission can be adjusted.

FIGS. 2 and 3 illustrate the basic principle of adjusting the amount of light transmission. Figure 2 shows the light transmitting state shown in Figure 1, and shows a state in which plates a and a and b and b of plates 1 and 2 overlap, respectively. In this case, the light is transmitted according to the transmittance and polarization rate of the polarizing film. Only the transmitted amount passes through. Figure 3 shows the second transparent state in which a and b of plates 1 and 2 overlap, respectively. In this case, in addition to the first transparent state, a and b overlap each other. Due to the polarization effect, the amount of light transmitted is reduced compared to the first light transmission state.

FIG. 4 shows a first embodiment of the present invention.

In the first embodiment, the amount of light transmitted is adjusted by manually moving the movable plate. In the figure, 1 indicates a movable plate, 2 indicates a fixed plate, and 3 indicates a case. Both plates 1 and 2 are fitted into grooves formed in case 3 and are held at an interval of 0.2 to 0.3 tm. 4 is a knob for adjusting the amount of transmission by moving the movable plate 1 up and down, and 5 is a support shaft for rotatably attaching the case 3 to the vehicle body.

FIG. 5 shows an example of a sun visor configured as described above attached to a vehicle body. In this example, the support shaft 5 is provided at the boundary between the ceiling 100 of the vehicle and the upper part of the windshield I01, and when sunlight enters the vehicle interior at an angle indicated by arrow S2, the driver 200 Since there is no need for anti-glare, the case 3 is rotated toward the ceiling 100. When sunlight is incident at the angle indicated by arrow S1, the occupant manually rotates case 3 to the position indicated by the dotted line in Fig. 5, and then adjusts knob 4 shown in Fig. 4. The amount of transmission is limited depending on the intensity of incident light.

Next, the movable mechanism of the movable plate 1 will be explained using FIG. 6.

The rotation of the knob 4 is transmitted to the shaft 9 and the pinion 6 to rotate them. Therefore, the rack 7 engaged with the pinion 6 moves in the vertical direction, and the stay 13 and the movable plate 1 fixed to the stay 13 move accordingly. In this case, the backlash between the rack 7 and the pinion 6 is removed by the spring 8, and the guide shafts 12 are provided on both sides. By the guide ring 1),
Consideration has been taken to ensure parallel movement. Note that the guide ring 1) and the bearing 10 are fixed to a case (not shown).

FIG. 7 shows a second embodiment of the invention. In the figure, 20 is a motor, 21 is a controller, 22 is an operation switch, 3
0 indicates a light sensor, respectively. The first feature of this embodiment is that remote control can be performed using the operation switch 22 provided on the driver's seat. UP operation switch 22
Or, if you switch to the DOWN side, controller 21
The motor 20 rotates forward or backward through the movable plate 1, and the movable plate 1 moves up and down to switch to the first transparent state shown in FIGS. 2 and 3, respectively. Note that the structure of the drive section is the same as that of the embodiment shown in FIG. 5, so a description thereof will be omitted.

The second feature of this embodiment is that sunlight is detected by the optical sensor 30, and its output signal is transmitted to the motor 20 via the controller 21, so that the anti-glare effect is automatically exerted. . Incidentally, whether the optical sensor 30 or the switching switch 22 is used is selected by a selection switch 104.

FIG. 8 shows in detail the configuration of the controller in the application example shown in FIG. 7. If the selection switch 104 is now turned off, the movable plate 1 will not be switched to the position according to the command from the changeover switch 22. In other words, selection switch 1
When 04 is off, lighting switch 10 is normally
4 is OFF, and contacts b and c of the relay 105 are connected. The signal of the manual changeover switch 22 is applied to the capacitor 1)2. Capacitor 1) 2 is resistor 1) 3
For example, when the changeover switch 22 is switched to the contact 22a, which is in the second transparent state, when the voltage changes from the ground voltage OV to the power supply voltage 12V, the resistor 1)
The voltage change at the point where 3 and capacitor 1) and 2 are connected changes from 2 partial voltage 6 to 18V, and after 3 seconds, 6
Return to V.

The comparator 107 compares this with a scheduled reference voltage, and the comparator 107
A high level is output from the resistor 121, turning on the transistor 1) 4 and the relay 1) 0. As a result, contacts a-C of relay 1)0 are connected, current flows to motor 8 in the direction of arrow 8b via contacts b-c of limit switch 50, and movable plate 1 is driven by motor 8. At this time, limit switch 50 contacts a-C
When connected, the power supply is cut off and the motor 8 is stopped.

Next, the changeover switch 22 is set to the contact 2 which is on the first transparent state side.
．． When switching to 2b, the changeover switch 22 will set the ionization voltage to 12V.
When the voltage changes from to ground voltage OV, the voltage change at the point where resistor 1) 3 and capacitor 1) 2 are connected is from 6■ to 16
The voltage changes to V, and returns to 6V after 3 seconds. The comparator 108 compares this with a reference voltage, and a high level is output from the comparator 108 only for the time when the voltage becomes lower than the reference voltage, and the transistor 1) 6,
Turn on relay 109. This causes relay 109
Contacts a-c of the limit switch 1) are connected, and the motor 8 rotates in the reverse direction due to the current flowing in the direction of the arrow 8b through the contacts b-c of the limit switch 1), and the limit switch 1) of the movable play 1-1 is activated. When the limit switch 1) contacts a-c are connected, the motor 8 is de-energized and stopped.

Next, when the selection switch 104 is turned on, the first light-transmitting state and the second light-transmitting state change depending on the signal from the optical sensor. In other words, when the selection switch 104 is turned on, the relay 105
is activated, contacts a-c of relay 105 are connected, and a signal from comparator 103 is applied to capacitors 1) and 2.

At this time, when the photodetector 13 detects light from the rear, a voltage divided by the photodetector 13 and the resistor 1) 8 is applied to one input terminal of the comparator 102. Comparator 1
A reference voltage is applied to the other input terminal of 02, and when the detected light becomes higher than the expected value determined by the reference voltage, a high level is output from the comparator 102, which is the reference voltage applied to the comparator 103. When the voltage becomes higher, the output of the comparator 103 changes from low level to high level. The subsequent operation according to the output of the comparator 103 becomes the second transparent state as described above.

Next, when the photodetector 30 no longer detects light, the voltage becomes lower than the reference voltage of the comparator 102, so the comparator 102 changes from high level to low level.

The output voltage of the comparator 103 does not change while the capacitor 120 is discharging, but changes from high level to low level when the discharge ends. After this, the operation becomes the first transparent state as described above. Note that this circuit has a resistor 1) 9
and a capacitor 120 constitute an integrating circuit, which is designed not to operate against instantaneous light.

As described above, according to the second embodiment, by providing the operation switch 22 in the driver's seat, the occupant is freed from the trouble of having to reach for the ceiling, and even while driving, he can The transmittance of light can be changed accordingly.

Furthermore, when a light detection means is provided, the amount of light transmission can be automatically controlled, contributing to safer driving.

FIG. 9 shows a third embodiment. In this embodiment, in order to protect the polarizing film, a transparent plate 30 is placed on the part that is easily touched by the driver.
Further, a wiring 32 drawn out from the controller 21 is housed in an arbor 33 formed of a hollow pipe. In addition, the drive section is arranged on the fulcrum side in consideration of its weight.

An embodiment in which the controller 21 has a link mechanism and a gear mechanism will be described below.

FIG. 10 shows an embodiment in which the movable plate 1 is moved up and down by a link mechanism. In the figure, by rotating the motor 20 in the forward direction, the worm 40 rotates, and a force F is applied to the worm wheel 41 meshing with the worm 40 to cause it to rotate. The arm 42 is screwed to the worm wheel 41 at two locations C1d, receives a force F, and applies a force F' that tends to push down the stay 43. In this case, the arm 42 and the stay 43 are slidably connected by a pin 45, and the stay 43 is formed to be elongated so that the pin 45 can move from side to side as needed.

The arm 44 is slidable on the stay 43, arm 42, and stay 46, respectively, and is attached to pins 47, 48, and 49.
The stay 46 is formed to be long so that the pin 49 can be moved from side to side as necessary. The force F' causes the pin 45 to move to the left in the drawing, and when the movable plate 1 is lowered, the pin 49 also moves to the left in the drawing, so a force F' is applied to the stay 43 by the arm 44. Therefore, the motor By rotating 20 in the opposite direction, a force acts in the opposite direction, allowing the movable plate 1 to move parallelly and smoothly.

The drive mechanism shown in FIG. 1) is a simplified embodiment of the mechanism explained in FIG. 10. In the figure, when the motor 20 is rotated, the worm wheel 5 is rotated by the worm 50.
1 rotates. The arm 52 is slidably connected to the stay 54 by a pin 53.
The movable plate 1 is moved up and down by the arm 52 which receives the force of the worm wheel 51 to rotate. Note that 55 indicates a guide pin for moving the movable plate 1 in parallel, and 56 indicates a guide pin for moving the movable plate 1 in parallel.
indicates a guide ring.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the basic structure of the device of the present invention;
3 and 3 are explanatory diagrams of the basic adjustment action, FIG. 4 is a perspective view showing the first embodiment of the present invention, FIG. 5 is a plan view showing the installed state of the device of the present invention, and FIG. 6 is a perspective view showing the internal configuration of FIG. 4, FIG. 7 is a perspective view showing the second embodiment of the present invention, FIG. 8 is an electric circuit diagram of the controller 21 shown in FIG. 7, and FIG. A perspective view showing a third embodiment of the invention, the first
Figure 0 and Figure 1) are a perspective view and a plan view showing a modification of the drive mechanism for the movable plate. 1... Movable plate, 2... Fixed play), a
, b... Polarizing film, 3... Case, 4... Movable plate adjustment knob, 5... Support shaft, 20... Motor, 22... Changeover switch, 30... Optical sensor .

Claims (2)

[Claims] (1) A light shielding member that blocks light rays entering the vehicle interior from the upper part of the window of the vehicle, and this light shielding member is supported by the upper part of the window, and when there is no need for light shielding, the light shielding member is attached to the ceiling of the vehicle. In the vehicle sun visor, the light shielding member has two overlapping plates in which two types of band-shaped polarizing films having different polarization directions are arranged at regular intervals, and at least one of the plates is movable. A sun visor for a vehicle, characterized in that the movable plate is configured such that the light transmittance can be adjusted as the movable plate moves. (2) The light shielding member includes a command signal generating means for generating a movement position command signal for determining a movement position of the movable plate, and a driving means for moving the movable plate to a predetermined movement position based on the command signal. 2. The vehicle sun visor according to claim 1, wherein said movable plate is moved by said movable plate.