JPH0740091B2 - Light transmission amount adjustment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is for vehicles such as automobiles and trains, and offices, restaurants,
The present invention relates to a light transmission amount adjusting device that can be used for buildings such as general houses. In addition, the present invention relates to a light transmission amount adjusting device which can be installed in a rear window of a passenger car, a rear window and a side window of a wagon vehicle, and can be operated manually or remotely.

[Conventional technology]

Although there are curtains, blinds (including electric type) as means for blocking the sunlight coming in from the rear window and side windows of an automobile, the applicant of the present invention has the disadvantage of these things, that is, it takes time to open and close, operating time. Japanese Patent Application No. Sho 59-222440 is a device for adjusting the amount of light transmission that can solve the problems of requiring a long time, a large operating noise, and obstructing the field of view when closed.
It is proposed in the issue.

To do this, two polarizing plates, in which two types of strip-shaped polarizing films having different polarization directions are alternately arranged in a row at a constant interval, are stacked, and at least one of them is moved. A light transmission amount adjusting device for controlling light transmission has been proposed.

[Problems to be solved by the invention]

However, in the above-described light transmission amount adjusting device, when dust, dust, or the like enters between the two polarizing plates, the polarizing film is scratched due to the movement of the polarizing plates and the light-shielding property is deteriorated, or the light transmission is caused by dirt. Therefore, there is a problem in that the sliding property is deteriorated and further the sliding property is deteriorated. In particular, when the area of the polarizing plate is large and the outer peripheral edge is long, dust and the like are likely to enter from the outer peripheral edge, so that the above problem becomes remarkable.

An object of the present invention is to solve the above problems and provide a light transmission amount adjusting device having excellent durability.

[Means for solving problems]

The light transmission amount adjusting device according to the present invention has two different polarization directions.
Moving at least one of the first and second polarizing plates in which two polarizing plates in which two kinds of band-shaped polarizing films are alternately arranged in a row at a constant interval are stacked, and at least one of the first and second polarizing plates is moved. At the very least, a light amount changing means for changing the light transmission amount according to the movement, and a light-transmitting member 2 disposed on both sides of the first and second polarizing plates to protect the first and second polarizing plates. A sheet of protective plate; a sealing member arranged along the outer peripheral edge of the protective plate to maintain the airtightness of the space formed by the two protective plates; and an outer peripheral frame member for sandwiching the sealing member from the outer periphery. It is characterized by including.

[Operation and effect of invention]

According to the present invention, the first and second polarizing plates are protected by the protective plates from both sides thereof, and a sealing member that maintains airtightness along the outer peripheral edge of the protective plate and an outer periphery that sandwiches the sealing member from the outer periphery. By providing the frame member, dust and the like from the outside are surely prevented from entering the space formed by the protective plate, so that the problem that the polarizing film is scratched is solved. In addition, since the deformation strength is improved by the outer peripheral frame member, the slidability of the two polarizing plates can be improved, and the operation can be made smoother, so that the reliability,
It is possible to provide a light transmission amount adjusting device having high durability.

〔Example〕

Hereinafter, the present invention will be described based on an embodiment equipped in a rear window of a passenger car.

FIG. 2 shows the basic structure of the light transmission amount adjusting device according to the present invention, in which 1 is a movable side polarizing plate, 2 is a fixed side polarizing plate, and two types of strip-shaped polarizing films a, b are alternately arranged in rows at a predetermined interval 1 (10 mm in this embodiment). In this case, the polarizing films a and b have different polarizability by 90 degrees. Therefore, when the polarizing films a and a and b and b of both the polarizing plates 1 and 2 overlap, light is transmitted and the movable side polarizing plate 1 is
It is difficult for light to pass when a and b are overlapped with each other and b and a are overlapped with each other. In this case, the amount of light passing can be freely set by changing the polarization rate and the transmission rate of the polarizing film. In addition, by adjusting the relative movement amount of both polarizing plates, it is possible to adjust the total light transmission amount.

3 and 4 illustrate the basic principle of adjusting the light transmission amount. In FIG. 3, it is shown that a and a and b and b of the polarizing plates 1 and 2 are overlapped with each other, and in this case, almost all light passes through. FIG. 4 shows that a and b of the polarizing plates 1 and 2 and b and a of the polarizing plates overlap each other, and in this case, the polarizing action works and the light transmission amount decreases.

FIG. 5 shows an overall configuration diagram of an embodiment in which the present invention is applied as a blind for a rear window for a vehicle. In the figure, 1, 2 are the polarizing plates, 3 is a polarizing plate driving motor, 4 is an outer peripheral frame, 5 is a column, and 20 is a void-shaped member. Detailed structures and driving directions are shown in FIGS. 1 and 6 to 8.
Each will be described with reference to the drawings.

The outer peripheral portion B of the blind will be described with reference to FIG.
FIG. 1 is an enlarged partial sectional view of portion B in FIG. In the figure
Reference numerals 6 and 7 denote transparent plates that serve as protective plates for housing and protecting the polarizing plates 1 and 2, for example, transparent acrylic plates or the like are used. 8
Is a seal cover as a sealing member, 9 is an outer frame, and 10
Is a spacer, and 20 is a void forming member. The fixed side polarizing plate 2 is fixed to the transparent plate 6 by adhesion or the like. A spacer 10 is arranged between the fixed-side polarizing plate 2 and the transparent plate 7 along the entire outer peripheral edge thereof, and the movable-side polarizing plate 1 is accommodated in the space formed thereby so as to be vertically movable. ing. Also, on both sides of the spacer 10,
By fixing one end of the linear void forming member 20,
A gap forming member 20 is interposed between the movable polarizing plate 1, the fixed polarizing plate 2, and the transparent plate 7 to improve the slidability of the movable polarizing plate 1.

The seal cover 8 is made of rubber, and the polarizing plates 1, 2,
The transparent plates 6 and 7 are provided along the entire outer peripheral edge of the transparent plates 6 and 7 to seal the space and voids and prevent dust, dust, and the like from entering the space from the outside. The outer peripheral frame 9 is made of metal and is arranged so as to be sandwiched from the outer periphery of the seal cover 7 in consideration of the overall strength. The outer peripheral frame 9 is tilted along the vehicle rear window and fixed in the vehicle interior.

As shown in FIG. 5, a linear gap forming member 20 is formed between the polarizing plates 1 and 2 in order to form a gap between the plates, along the vertical direction in which the polarizing plate 2 moves, and at a predetermined interval. Are separated from each other. For the space forming member 20, for example, a thread such as nylon or Teflon having good slidability is used. The void forming member 20 is preferably transparent. This will be described in detail with reference to FIG.

FIG. 6 is a cross-sectional view of part A in FIG. 5 viewed from above. In the figure, 1 is a movable-side polarizing plate, 2 is a fixed-side polarizing plate, and 6 and 7 are transparent plates provided on both sides to protect the polarizing plate. The polarizing plates 1 and 2
It is about 0.3 mm. As shown in the figure, the gap forming members 20 are arranged on both surfaces of the movable side polarizing plate 1 with a predetermined space therebetween.
Therefore, a space d corresponding to the diameter of the linear space forming member 20 is formed between the movable side polarizing plate 1 and the transparent plate 7, and between the movable side polarizing plate 1 and the fixed side polarizing plate 2. The movable side polarizing plate 1 can be satisfactorily slid without contacting the transparent plate 7 and the fixed side polarizing plate 2. In this case, the sliding resistance is extremely low. Therefore, it is possible to solve the problem that the movable side polarizing plate 1 is scratched due to contact with other members and has a large sliding resistance.

FIG. 7 is a partial side sectional view of the drive motor section (C section in FIG. 1) of the movable side polarizing plate 1 which serves as a light quantity changing means.
3 is a motor fixed to the support column 5, 11 is a drive arm that moves in the vertical direction with the rotation of the motor 3, and 12 is fixed to the movable side polarizing plate 1 by adhesion or the like through the hole 7a of the transparent plate 7. A sliding block that
The distal end pin 11a of the drive arm 11 is slidably fitted in the guide groove 12a of 12. The vertical movement of the sliding block 12 is regulated within a predetermined range (the same distance as the width of the strip-shaped polarizing films a and b) by two stoppers 13 provided so as to project on the side surface of the column 5.

FIG. 8 is a view showing the support structure of the support column 5, D in FIG.
It is a partial side sectional view of a part. The movable side polarizing plate 1, the fixed side polarizing plate 2, and the transparent plates 6 and 7 are fixed and held from both sides by two columns 5. Reference numeral 14 is a screw for fixing the columns 5 on the front side and the back side, and fixes the columns 5 via a positioning bush collar 15. The collar 15 is integrally formed of a columnar portion 15a inserted into the positioning hole of the column 5 and a plate-like spacer 15b provided between the fixed polarizing plate 2 and the transparent plate 7 and extending along the vertical direction of the column 5. Has been done.
The movable side polarizing plate 1 is formed with a sliding hole 1a along the vertical direction so as not to interfere with the spacer 15b during movement. The support 5 is fixed by a plurality of screws 14 and a collar 15.

FIG. 9 shows a state in which the blind shown in FIG. 1 is mounted. Reference numeral 30 denotes the above-mentioned blind which is mounted in the vehicle by inclining along the rear window 31, and 21 denotes an operation for switching between automatic and manual. A switch, 22 is a controller, and 23 is a photodetector. The operation switch 21 is arranged in the vicinity of the driver's seat as shown in the figure, and can be operated remotely as needed.
Further, in this embodiment, manual and automatic operations are possible. 10th
The figure is a block diagram of the controller 22, in which 100 is an input arithmetic processing circuit that outputs a control signal in response to signals from the optical sensor 23 and the operation switch 21, 101 is a motor drive circuit that outputs an energization signal to the motor 3, and 102 is This is a position detection circuit that detects the position of the movable polarizing plate 1 by the rotation of the motor 3.

Next, the operation will be described based on the above configuration.

When the driver operates the operation switch 21 to shield light in the manual mode, the controller 22 drives the motor 3 for a predetermined rotation. Drive arm when motor 3 rotates
11 receives this and moves the sliding block 12 upward. Therefore, the movable side polarizing plate 1 slides upward and enters a light shielding state (state shown in FIG. 4), and the amount of light entering the vehicle interior from the rear of the vehicle is reduced and adjusted. In this case, the amount of movement of the movable side polarizing plate 1 is equal to that of the arranged polarizing films a and b.
Stopper 13 so that the width becomes one (10 mm in this embodiment).
It is regulated by.

Also, when the operation switch 21 is set to the auto mode, the light detector 23 detects the light from behind that makes the driver's vehicle dazzle due to the headlights of the following vehicle when driving at night. Then, the controller 22 drives the motor 3 to move the movable side polarizing plate 1 to block the light and exert the antiglare effect. In this case, the photodetector
23 may be set to activate when the driver turns on the headlights.

In the above-mentioned embodiment, the spacer 10 is the fixed side polarizing plate 2
It is arranged between the transparent plate 7 and the transparent plate 7, but instead of this, 2
A space may be formed between the transparent plates 6 and 7 along the entire outer peripheral edge thereof.

Further, in the above-mentioned embodiment, in the case of the auto mode, the control was performed based on the signal from the photodetector 23, but as other sensors, a room temperature sensor for detecting the temperature inside the vehicle, a solar radiation sensor for detecting the amount of solar radiation. Alternatively, the air conditioner may be controlled based on an air conditioner switch or the like to be operated, and may be automatically shut off when it is necessary to prevent an increase in the room temperature.

[Brief description of drawings]

The attached drawings show an embodiment in which the present invention is applied as a blind to be mounted on a rear window of a passenger car, and FIG. 1 is a sectional view of a main part thereof, which is a partial sectional view of a portion B of FIG.
FIG. 2 is a perspective view showing the basic structure of the light transmission amount adjusting device, FIGS. 3 and 4 are explanatory views of the basic adjusting action, FIG. 5 is an overall configuration diagram of the embodiment, and FIG. Is A in FIG.
FIG. 7 is a partial side sectional view of a portion C in FIG. 5, FIG. 8 is a partial side sectional view of a portion D in FIG. 5, and FIG. 9 is a blind shown in FIG. (3
Fig. 10 is a schematic diagram showing the mounting state of (0)
It is a block diagram of 2). 1 ... Movable side polarizing plate, 2 ... Fixed side polarizing plate, 4 ... Outer frame, 6,7 ... Transparent plate, 8 ... Seal cover, 9 ... Outer frame, a, b ... Polarizing film.

Claims (1)

[Claims] 1. A first and a second polarizing plate in which two polarizing plates in which two types of band-shaped polarizing films having different polarization directions are arranged alternately and in a row at regular intervals, are stacked. Light amount changing means for moving at least one of the second polarizing plates and changing the amount of light transmission according to the movement, and both sides of the first and second polarizing plates for protecting the first and second polarizing plates. A pair of translucent protective plates disposed on the inner surface of the protective plate, a sealing member disposed along an outer peripheral edge of the protective plate for maintaining a hermetically sealed space formed by the two protective plates, An optical transmission amount adjusting device, comprising: an outer peripheral frame member that holds the member from the outer periphery.