JPH07259435A - Crime preventing fence - Google Patents

Abstract

PURPOSE:To improve crime prevention by arranging a transparent electrode film on the opposed surfaces of a pair of transparent reinforced glass plates, providing a specified liquid crystal film between transparent electrodes, and making the liquid crystal film opaque in an emergency. CONSTITUTION:A liquid crystal film 4 is held by a pair of reinforced glass plates 3 from both sides. Next the liquid crystal film 4 arranges a liquid crystal layer 8 between transparent intermediate films 5 in which a pair of transparent electrode films 6 are provided, and the outer periphery of the film 5 is sealed by a seal member 7. The liquid crystal layer 8 uses one made by sealing nematic liquid crystal in multiple capsules 9. Then, when a voltage is not applied, because liquid crystal molecules are arranged along the wall surfaces inside the capsules 9 which are dispersed and held, light incident on the surface of the film 4 is scattered and colored milky white. In addition, when a voltage is applied across electrodes 6, the liquid crystal molecules in the capsules 9 are arranged vertically relative to the surfaces of the electrodes 6 and become transparent. Thus the transparency can be interrupted as required, and also impact resistance can be increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a security fence, and more particularly to a security fence used in openings such as show windows, showcases and windows, or counters such as banks and convenience stores.

[0002]

2. Description of the Related Art In recent years, crimes such as robbing money have been increasing in convenience stores and banks. As a cause of the crime of robbery of money, although there are many cases where employees handle money at a short distance from the customer, the counter is not provided with a fence or the like for crime prevention. Even if it is applied, it is for decoration with a height of about 50 cm, and it does not fulfill the original function as a crime prevention fence.

[0003]

Therefore, it is conceivable to surround the counter with a sturdy iron grid or to install a crime prevention fence using bulletproof glass or the like. However, the crime prevention fence having such a structure is extremely heavy in appearance and gives the customer a feeling of discomfort and pressure. Further, it requires a great deal of cost to install bulletproof glass or the like on the counter, and thus it is difficult to employ it as a crime prevention fence.

An object of the present invention is to solve the above problems in a security fence.

[0005]

That is, according to the present invention, a transparent electrode film is provided on each of opposing surfaces of a pair of transparent tempered glass plates, and nematic liquid crystal is enclosed in a large number of capsules. The liquid crystal film thus arranged is interposed between the transparent electrode films.

In the present invention, at least one of the transparent electrode films is provided with electrically independent regions such as characters and figures, and lead lines are taken out from the region and the transparent electrode film other than this region, respectively. The voltage is selectively applied to the line.

[0007]

In the crime prevention fence of the present invention, the voltage applied between the transparent electrode films is cut off in an emergency, and the liquid crystal film is made opaque so that the criminals can cut off the field of view. It can exert its function.

Further, since at least one of the transparent electrode films is provided with electrically independent regions such as characters and figures,
By selectively applying a voltage, in addition to the function as a crime prevention fence, it is possible to display characters, figures, etc. formed on each transparent electrode film on the display surface.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic perspective view showing an installed state of a crime prevention fence at a counter of a bank or the like. In FIG. 1, the crime prevention fence (1) has a notch portion near the center of its lower portion to allow the transfer of money and the like, and a counter (2).
It is erected on the upper surface.

As shown in FIG. 2, the security fence (1) has a structure in which a liquid crystal film (4) is sandwiched between a pair of tempered glass plates (3) from both sides. In addition, the liquid crystal film (4) is a PE having a pair of transparent electrode films (6) formed inside by vacuum deposition or the like.
A liquid crystal layer (8) is disposed between transparent intermediate films (5) made of a plastic material such as a T film, and the outer circumference of the transparent intermediate film (5) is sealed by a seal member (7).

The tempered glass plate (3) is preferably thicker in order to improve impact resistance, but is usually 3 mm thick.
The above is enough.

The liquid crystal layer (8) is filled with polarized nematic liquid crystal and contains polyvinyl alcohol (PV
A spherical shell-shaped capsule made of a polymer material such as A) (9)
It is possible to use a large number of dispersed in a solution.
That is, when an aqueous solution of PVA and a nematic liquid crystal are mixed and suspended by a colloid mill, a PVA carrier in which suspended particles in which liquid crystal is encapsulated in a spherical shell (capsule) of PVA is dispersed is obtained. Transparent electrode film for carrier (6)
A liquid crystal layer (8) composed of this PVA carrier can be obtained by applying to the above.

In the liquid crystal film (4), the transparent electrode film (6) is not limited to an ITO (Indium-Tin Oxide) film, but a tin oxide film or the like may be applied. The thickness of the transparent electrode film (6) may be about 200 Å, and the thickness of the liquid crystal layer (8) may be about 20 μm.

The pair of transparent electrode films (6) is connected to a power source (11) through a switch (10), and capsules in which liquid crystal molecules are dispersed and held in the state where no voltage is applied. Since they are arranged along the wall surface in (9), the light incident on the surface of the liquid crystal film (4) cannot travel straight and is scattered by the nematic liquid crystal. As a result, the liquid crystal film (4) becomes cloudy glass with a milky white color, and the image on the opposite side cannot be seen through the liquid crystal film (4).

On the other hand, between the transparent electrode films (6), for example, 40-
When an AC voltage of 100 V is applied, the long axes of the liquid crystal molecules inside the capsule (9) are aligned parallel to the electric field direction according to the applied voltage, so that the liquid crystal molecules inside the capsule (9) are transparent electrodes. It is aligned perpendicular to the plane of the membrane (6). As a result, the liquid crystal film (4) becomes transparent, and the image on the opposite side can be seen through. In this state, the appearance is no different from that of a normal transparent glass plate.

Furthermore, by arbitrarily controlling the voltage intensity applied between the transparent electrode films (6), the transmittance is steplessly changed between a sufficiently scattered and opaque state and a sufficiently transparent state. You can also let it. With this configuration, for example, when a criminal arrives through the counter (2) shown in FIG. 1, the respondent turns off the power switch (10) to instantly turn on the crime prevention fence (1). It can be frosted and glassy to block the view of criminals.

FIG. 3 is a pattern circuit diagram for displaying a segment provided on the transparent electrode film (6), and FIG. 4 is FIG.
It is an enlarged view of the A section. 3 and 4, the pattern electrode (12) is provided with a display region (12a) and a non-display region (12b) electrically independently of each other through the removal part (14), and each region (12a) (12b). A take-out line (13) is taken out from each.

The display area (12a) and the non-display area (1
The removal portion (14) is provided between 2b) by removing the boundary portion between both regions to a predetermined width by a known method such as an etching method. The width of the removing part (14) is 2
The liquid crystal element can be driven statically by using a common electrode (one circuit) for the transparent electrode film (6) facing the transparent electrode film (6).

In the security fence, the display area (1
When electricity is applied to 2a) and the non-display area (12b), only the removal portion (14) is in an opaque state, and the other areas are in a transparent state. When displaying a segment on a part of the crime prevention fence, the non-display area (12b)
A desired number can be displayed by energizing the device and energizing the display area (12a) other than the display area corresponding to the number to be segment-displayed.

FIG. 5 is a pattern circuit diagram for displaying a logo provided on the transparent electrode film (6). Also in this circuit diagram, as in the case of FIG. 3, the pattern electrode (12)
Is provided with a display region (12a) and a non-display region (12b) electrically independently of each other through the removing unit (14), and each region (1
Extraction lines (13) are extracted from 2a) and 12b, respectively. The forming means and the like of the removing portion (14) are the same as those in FIGS. 3 and 4.

In the security fence, the display area (1
When electricity is applied to 2a) and the non-display area (12b), only the removal portion (14) is in an opaque state, and the other areas are in a transparent state. When a logo is displayed on a part of the security fence, the non-display area (12b) may be energized and the display area (12a) may be de-energized.

[0023]

As described above, since the crime prevention fence of the present invention does not use an iron grate or the like, it does not give a heavy pressure feeling or a discomfort feeling. Further, since the liquid crystal film exhibiting reversible bistability between the light scattering state and the light transmitting state is arranged, the transparency of the liquid crystal film is changed by controlling the voltage between the transparent electrode films. be able to. That is, by making the security fence frosted glass when necessary, it is possible to cut off the see-through from the other side, and it is possible to exert an excellent function from the viewpoint of safety.

Since at least one of the transparent electrode films is provided with electrically independent areas such as characters and figures,
By controlling the voltage application state in those transparent electrode film areas, not only the function as a crime prevention fence but also various patterns such as advertisement, time display, weather information, message or character can be displayed. It is possible to provide a crime prevention fence with excellent appeal to customers and customers.

Further, since the crime prevention fence of the present invention uses the tempered glass plate for general building materials, it has a low penetration resistance to a bullet of a pistol, for example, but has an excellent impact resistance to a hammer, etc. Cheap compared to.

[Brief description of drawings]

FIG. 1 is a perspective view illustrating an installation state of a crime prevention fence of the present invention.

FIG. 2 is a partial sectional view illustrating a crime prevention fence.

FIG. 3 is a circuit diagram showing a segment display pattern.

[Figure 4] Circuit diagram showing the logo display pattern

[Explanation of symbols]

 1 Security fence 3 Tempered glass plate 4 Liquid crystal film 6 Transparent electrode film 8 Liquid crystal layer 9 Capsule 12 Pattern electrode 12a Display area 12b Non-display area 14 Removal section

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[Procedure amendment]

[Submission date] June 30, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a perspective view illustrating an installation state of a crime prevention fence of the present invention.

FIG. 2 is a partial sectional view illustrating a crime prevention fence.

FIG. 3 is a circuit diagram showing a segment display pattern.

FIG. 4 is an enlarged view of part A in FIG.

[Figure 5] Circuit diagram showing the logo display pattern

[Explanation of reference symbols] 1 crime prevention fence 3 tempered glass plate 4 liquid crystal film 6 transparent electrode film 8 liquid crystal layer 9 capsule 12 pattern electrode 12a display area 12b non-display area 14 removed portion

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location G02F 1/1333

Claims (2)

[Claims] 1. A transparent electrode film is provided on each of a pair of transparent tempered glass plates facing each other, and nematic liquid crystals are enclosed in a large number of capsules. A crime prevention fence characterized by being interposed between electrode films. 2. At least one of the pair of transparent electrode films is provided with electrically independent regions such as characters and figures, and lead lines are taken out from the region and the transparent electrode film other than the region, respectively. The security fence according to claim 1, wherein a voltage is selectively applied to the security fence.