JP2005053734A - Plate glass with electroconductive film, method of manufacturing the same, laminated glass with electroconductive film and crime prevention glass system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plate glass with an electroconductive film of which the breakage is detected by measuring an electrical change in the conductive film formed on the plate glass, is obtained as a transparent plate glass having excellent visibility and is easily manufactured in a labor-saving manner, a method of manufacturing the same, a laminated glass with the electroconductive film and a crime prevention glass system. <P>SOLUTION: In the plate glass with the electroconductive film, the continuous belt like transparent electroconductive film 3 is formed on the peripheral end part of the almost overall periphery of the surface of the plate glass 1 including the edge part and has a leading end 3a and a terminal 3b which are adjacent to each other only on one place in the overall periphery of the electroconductive film 3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a plate glass with a conductive film that forms a conductive film on a plate glass and detects a break of the plate glass by measuring an electrical change of the conductive film, a manufacturing method thereof, a laminated glass with a conductive film, and a security glass system. .

  Patent Document 1 discloses a security plate glass in which a conductive material is formed in a continuous character or pattern at predetermined positions on a plate glass, terminals are attached to both ends of the plate glass, current is passed, and current interruption due to cracking of the plate glass is detected. ing. However, the crime prevention glass plate of Patent Document 1 draws a character or a pattern by applying a conductive substance to the glass plate and heat-adhering it, so that it takes time to produce, and the work is troublesome and troublesome. Furthermore, since there are letters or patterns, the transparency and visibility of the plate glass are reduced.

  On the other hand, a transparent conductive film is formed in a substantially rectangular shape on the surface of the plate glass, and a bus bar made of Ag paste is printed on the upper and lower sides of the transparent conductive film. Patent Document 2 discloses a method for detecting cracks in a plate glass that measures and detects the voltage via a voltage or current. However, the method of detecting cracks in the glass sheet of Patent Document 2 is to form a conductive printed wire for connecting the bus bar or the bus bar and the terminal with Ag paste on the surface of the glass sheet. The transparency and visibility of the plate glass were reduced.

JP 47-6314 A Japanese Patent Laid-Open No. 2-99446

  The present invention is based on the above prior art, and can measure the electrical change of the conductive film formed on the plate glass to detect cracks in the plate glass, and can obtain a transparent plate glass with good visibility. An object of the present invention is to provide a plate glass with a conductive film that can be easily produced without being damaged, a manufacturing method thereof, a laminated glass with a conductive film, and a security glass system.

  In order to achieve the above object, according to the first aspect of the present invention, a continuous transparent belt-like conductive film is formed on the peripheral edge of the substantially entire circumference including the edge of the surface of the glass sheet, and the conductive film is formed on the entire circumference of the glass sheet. There is provided a plate glass with a conductive film characterized by having a start end and a termination close to each other only at one place.

According to a second aspect of the present invention, the conductive film is a single layer or a multilayer film using ITO, SnO ₂ or Ag.

  In invention of Claim 3, the laminated glass with an electrically conductive film characterized by bonding the plate glass with an electrically conductive film of Claim 1 or 2 with another plate glass through the intermediate film is provided.

  Furthermore, the invention according to claim 4 is characterized in that the conductive film is located on the intermediate film side and the plate glass with the conductive film is used on the indoor side.

  In invention of Claim 5, the electrically conductive film of the electrically conductive film of the glass with an electrically conductive film of Claim 1 or 2 or the electrically conductive film of the electrically conductive film of the laminated glass with an electrically conductive film of Claim 3 or 4 is made into the end of the electrically conductive film. Provided is a security glass system characterized in that a measuring means for measuring change is connected through a conductor.

  Furthermore, in the invention of claim 6, a transparent conductive film is formed on the entire surface of the plate glass, a part of the conductive film is removed by a conductive film removing means, and the conductive film is an end portion of the surface of the plate glass. A method of manufacturing a crime prevention plate glass with a conductive film is provided, wherein a pattern of a strip-shaped conductive film is formed so as to be a continuous belt-like shape at a peripheral edge of substantially the entire circumference including the conductive film.

  The invention according to claim 7 is characterized in that the formation of the strip-like conductive film pattern is carried out continuously on a line for producing plate glass.

  According to invention of Claim 1, the continuous transparent belt-shaped electrically conductive film is formed along the perimeter of the peripheral part including the edge part of plate glass, and the start end and termination | terminus of a conductive film are formed in one place of plate glass perimeter. Close to each other, and by measuring the electrical change between the two terminals by attaching terminals to the start and end of the plate, it continues to the entire circumference of the plate glass regardless of where the glass breaks. The crack of the glass reaches the conductive film molding portion provided in the manner, and the electrical change (for example, resistance) of the conductive film accompanying the crack of the glass can be detected. In this case, when the plate glass is fitted into a frame such as a sash, the conductive film and terminals around the plate glass can be accommodated in the frame, so that a transparent plate glass having excellent visibility and design can be obtained.

  According to the invention of claim 2, since the conductive film can be formed on the surface of the plate glass by chemical reaction such as CVD or printing, the production process is facilitated.

  According to invention of Claim 3, while using the plate glass with an electrically conductive film mentioned above for the laminated glass through an intermediate film, while a crime prevention effect increases, installation and fixation of a terminal become easy.

  According to the invention of claim 4, since the conductive film is not exposed to the outside of the laminated glass, the conductive film is sufficiently protected, and the conductive film is not affected even if the surface of the plate glass is cleaned or the surface of the plate glass is damaged. The deterioration is suppressed over a long period of time, and the reliability of crack detection is kept high.

  According to the invention of claim 5, for example, a constant current or voltage is applied to the continuous strip-shaped conductive film between the start end and the end, and the change in the resistance value that changes with the cracking of the glass is changed into the voltage change or the current change. Connect the electrical change measuring means to measure as. Thereby, the crack of glass can be detected instantly and reliably, for example, the crime prevention effect by the penetration | invasion from the window glass for houses can be heightened.

  According to the invention of claim 6, after forming a transparent conductive film on the entire surface of the plate glass, by removing a part of the conductive film, a continuous strip-shaped conductive film pattern is formed. The conductive film can be formed very easily with high accuracy.

  According to the invention of claim 7, since the conductive film pattern can be formed continuously on the plate glass production line on the plate glass production line, the production process can be simplified.

The present invention will be described below with reference to the drawings.
FIG. 1 is a schematic plan view of a plate glass with a conductive film according to the present invention.
As shown in FIG. 1, in the plate glass 8 with a conductive film according to the present invention, the conductive films 2 and 3 separated by the slits 7 are formed at the central portion and the peripheral portion of the surface of the plate glass 1. The conductive film 3 has a continuous band shape that includes the peripheral edge of the entire circumference of the four sides of the glass sheet 1 up to the edge. The conductive film 3 is divided at one point through the slit 9 and has a start edge 3a and a terminal edge 3b. A lead wire 5 made of a normal copper wire, FPC (flexible printed wiring board) or the like is joined to each of the start end 3 a and the end end 3 b, and is connected to the sensor 6 through the lead wire 5. This sensor 6 detects a change in resistance of the strip-shaped conductive film 3 due to glass breakage. For example, the sensor 6 detects a change in current by applying a constant voltage, or detects a change in voltage by applying a constant current. Thus, a resistance change is detected.

  Slits 7 and 9 are formed between the conductive films 2 and 3 and between the start and end of the conductive film 3. Since the slits 7 and 9 only have to be insulated between the conductive films 2 and 3, the width thereof can be selected as appropriate. For example, the width of the slits 7 and 9 is about 50 to 500 μm (for example, 200 μm). The slits 7 and 9 divide the conductive films 2 and 3 and the conductive film 3 between the starting end 3a and the terminal end 3b. As described later, the slits 7 and 9 are preferably formed after the conductive thin film is formed on the entire surface of the plate glass 1.

The conductive films 2 and 3 are transparent, and for example, ITO (Sn-doped In ₂ O ₃ film) or F-doped SnO ₂ film is used. In this case, as a conductive film having a two-layer structure of the alkali barrier film such as SiO ₂ or SiO _x C _y formed under the conductive film as an alkali component of soda lime does not affect the conductive film is a material of the glass sheet May be used. In this case, by using an alkali barrier film, optical interference occurs and an antireflection effect can be achieved. Alternatively, the conductive film may be formed using a multilayer film in which Ag is sandwiched between oxides such as Sn.

  As described above, if the conductive films 2 and 3 are transparent, the transparent plate glass 1 can be obtained without hindering the visibility of the plate glass 1. Here, even if the slit 7 is slightly exposed and recognized, the appearance and visibility of the plate glass 1 are not impaired. Further, by setting the conductive film 3 and the slit 7 to have a width dimension that can be accommodated in a frame such as a sash, the exposed portion is only the conductive film 2 and a transparent glass plate having a good appearance can be obtained. From the viewpoint of design properties, the width of the conductive film 3 is preferably 6 mm or less.

  When an impact is applied to the plate glass 1, cracks (cracks) are formed on the surface of the plate glass. When this crack reaches the conductive film 3 at the peripheral edge of the plate glass, the conductive film 3 is divided, or a part of the conductive film 3 is chipped or dropped off to reduce the surface area, thereby changing the resistance value of the conductive film 3. This resistance value change is detected by the sensor 6, and it can be known that the plate glass is broken. As a result, an alarm can be issued or a building manager can be notified and the security guard can be dispatched to the scene. Note that if tempered glass is used for the plate glass 1, cracks can easily reach the conductive film 3 at the periphery of the plate glass 1.

FIG. 2 is a flowchart showing a manufacturing process of the sheet glass with a conductive film according to the present invention.
First, a float plate glass is manufactured using a normal manufacturing method (step S1). Next, a conductive film is formed on the entire surface of the plate glass on extension of the plate glass production line (step S2). For film formation, a conductive material is formed (coated) by causing a chemical reaction on a plate glass using a thin film formation process used in a semiconductor device manufacturing process such as a CVD method. Next, a strip-like conductive film pattern (conductive film 3) is formed (step S3). An SnO ₂ film (especially an F-doped SnO ₂ film) is preferable because it can be easily formed by a CVD method.

  This conductive film pattern is obtained by forming the slits 7 and 9 by removing the conductive film on the surface of the plate glass using laser or wet etching. Note that the conductive film necessary for detecting cracks in the glass sheet is only the belt-like conductive film 3 at the periphery of the glass sheet, and the conductive film 2 in the central portion is unnecessary and may be removed. It may be left as it does not affect

By continuously performing the film formation and pattern forming step of the conductive film on the plate glass production line, the conductive film pattern can be formed continuously in the plate glass manufacturing process, so that the production process can be simplified. This float glass sheet can be post-treated, and can be bent by heat treatment or tempered by rapid cooling after heat treatment. If the conductive film is a SnO ₂ film, it can withstand heat treatment after film formation. After obtaining the plate glass with a conductive film of the present invention as described above, a security glass system is completed by attaching sensors to the start end 3a and the end end 3b of the conductive film 3 at the peripheral edge of the plate glass.

  In this way, a conductive film is formed on the entire surface of the glass sheet, and then the conductive film is formed by removing the conductive film with a laser or the like to form a conductive film pattern. Can do. In the case of forming an Ag conductive film, the conductive film can be patterned by printing using an Ag paste. In this case, only the strip-like conductive film 3 around the periphery of the glass sheet is printed from the beginning.

FIG. 3 is a cross-sectional view of a laminated glass using a plate glass with a conductive film according to the present invention.
As shown in the drawing, the laminated glass 10 with the conductive film is formed by laminating the plate glass 8 with the conductive film (the plate glass 8 in which the conductive films 2 and 3 are formed on one surface of the plate glass 1) and the plate glass 1 with the intermediate film 4 interposed therebetween. They are formed together. At this time, in order to join the lead wire 5 with the leading end 3a and the terminal end 3b (FIG. 1) of the conductive film 3 of the sheet glass 8 with the conductive film, the corresponding portion of the counterpart glass sheet 1 (left glass sheet 1 in FIG. 3). You may use what cut out. Thus, by using the plate glass 8 with a conductive film according to the present invention for laminated glass, not only can it be detected that the glass has been broken, but also the adhesive of the intermediate film 4 even if the laminated glass 10 is impacted and broken. The action only causes cracks on the glass surface, and the cracks are difficult to penetrate. If a sensor is attached to the laminated glass with a conductive film of the present invention and used as a security glass system, it becomes difficult to break the laminated glass 10 from the outdoor side and enter the indoor side, thereby increasing the security effect. As the plate glass 1 which comprises the plate glass 8, the plate glass etc. which consist of normal float glass, double tempered glass, or tempered glass are mentioned. The same applies to the plate glass 1 combined with the plate glass 8. When using a laminated glass, it is preferable that at least one glass is a normal float glass.

  In addition, it is preferable to arrange | position so that the electrically conductive films 2 and 3 of the plate glass 8 with an electrically conductive film may be located in the intermediate film 4 side between the plate glasses 1 and 1 of the both sides which comprise the laminated glass 10. FIG. Thereby, the conductive film 3 is not exposed to the outside and is protected by the both glass plates 1 and 1, and even if the laminated glass 10 is washed or the glass surface is damaged, the conductive film 3 is not affected. Deterioration of the conductive film 3 is suppressed, and the reliability of glass breakage detection is maintained.

Table 1 shows experimental data when glass breakage is detected using the laminated glass with conductive film 10 of FIG.

  A laminated glass 10 composed of a plate glass with a conductive film (in which a conductive film is formed on a normal float plate glass) 8 and a plate glass (normal float plate glass) 1 used in this experiment is an intermediate film of the laminated glass 10 with the conductive film 3. The plate glass 8 with the conductive film was arranged on the indoor side so as to be on the 4th side (the side sandwiched between the plate glasses 1 and 1 on both sides). The method for crushing the laminated glass 10 was performed by applying an impact to the position of about 1/3 on the diagonal line of the laminated glass 10 using a 410 g hammer or a 970 g cylindrical iron block. A constant current of 0.5 mA is passed through the conductive film 3.

  As shown in Table 1, regardless of the size and the presence or absence of sashes, the resistance of each laminated glass even after washing the glass surface or applying a light impact to hit the soccer ball on the surface The value is the same as the initial resistance value and does not change. Therefore, the crack of the plate glass 8 is not detected. However, the resistance after crushing is infinite, and cracks are reliably detected in any laminated glass. Moreover, the resistance value after cracking remained infinite after that, and stable results could be obtained.

The schematic plan view of the sheet glass with an electrically conductive film which concerns on this invention. The flowchart which shows the manufacturing process of the sheet glass with an electrically conductive film which concerns on this invention. Sectional drawing of the laminated glass which uses the plate glass with an electrically conductive film which concerns on this invention.

Explanation of symbols

1: plate glass, 2: conductive film, 3: conductive film, 4: intermediate film,
5: Lead wire, 6: Sensor, 7: Slit,
8: Plate glass with conductive film, 9: slit, 10: laminated glass.

Claims (7)

A strip-shaped transparent conductive film is formed continuously on the peripheral edge of the entire circumference including the edge of the surface of the plate glass,
The conductive glass sheet glass having a conductive film, characterized in that the conductive film has a start end and a terminal end that are close to each other only at one point of the entire circumference of the plate glass. The plate glass with a conductive film according to claim 1, wherein the conductive film is a single layer or a multilayer film using ITO, SnO ₂ or Ag.   A laminated glass with a conductive film, wherein the plate glass with a conductive film according to claim 1 or 2 is bonded to another plate glass through an intermediate film.   The said electrically conductive film is located in the said intermediate film side, and uses the said glass plate with an electrically conductive film indoor side, The laminated glass with an electrically conductive film of Claim 3 characterized by the above-mentioned.   Conductive measuring means for measuring an electrical change of the conductive film at the start and end of the conductive film of the glass with a conductive film according to claim 1 or 2, or the laminated glass with a conductive film according to claim 3 or 4. Security glass system characterized by being connected via A transparent conductive film is formed on the entire surface of the plate glass,
A part of the conductive film is removed by a conductive film removing means, and a pattern of the strip-shaped conductive film is formed so that the conductive film has a strip shape that is continuous with a peripheral portion of the entire circumference including the edge of the surface of the plate glass. The manufacturing method of the plate glass with an electrically conductive film characterized by performing. The method for producing a plate glass with a conductive film according to claim 6, wherein the formation of the belt-like conductive film pattern is continuously performed on a line for producing the plate glass.

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