JP2012000249A - Double transparent plate structure of pinball game machine and method for manufacturing double transparent plate structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double transparent plate structure of a pinball game machine and method for manufacturing the double transparent plate structure, which reduces a cost by improving productivity in manufacturing the double transparent plate structure.SOLUTION: The double transparent plate structure includes: a pair of transparent plate bodies 10 with two transparent plates arranged substantially in parallel on the front surface of a pinball game machine so as to see the front surface of a game board through the plate bodies; a soft holding body 30 which is made of a soft thermoplastic resin, has plate holding grooves 32 having an inner peripheral part where the outer peripheral edges of the pair of transparent plate bodies 10 are fitted, and holds the outer peripheral edges to be fitted into the plate holding grooves 32; and an attachment frame body 20 which is made of a hard thermoplastic resin, and arranged to externally fit the outer peripheral part of the soft holding body and to be attachable to the pinball game machine.

Description

  The present invention relates to a double transparent plate structure for a ball game machine disposed in front of a game board of a ball game machine and a method for manufacturing the double transparent plate structure.

  In a ball game machine such as a pachinko machine, a plate glass or the like is disposed in front of the game board, and a space serving as a game area is formed between the plate glass and the game board. The player shoots a game ball into the game area with the launching device, and plays a game based on the behavior of the game ball. Then, in the ball game machine, the game ball is paid out when a winning or the like is established. Although this sheet glass may be one sheet, as a countermeasure against fraud, it is often configured as a double sheet glass structure having a two-piece structure that has a predetermined interval and a space provided therebetween. .

  Conventionally, what was manufactured by the method of making the double plate glass structure adhere | attach with the both ends of a frame with an adhesive agent was common. For example, this double plate glass structure is formed by applying an adhesive to one step portion of the frame member with a dispenser or the like, and then sticking and bonding one plate glass, and then dispensing the other plate portion to the other step portion of the frame member. After applying the adhesive, the other plate glass is pasted and bonded. This double plate glass structure will be further described based on patent literature.

  A technique relating to a double glass assembly for a pachinko machine in which two plate glasses are bonded to both end faces of the frame of the pachinko machine is known (for example, see Patent Document 1). Further, as an improvement plan of the adhesive structure, a pachinko machine in which a support surface on which a cut surface of glass is bonded to a frame, an upright surface orthogonal to the support surface, and an adhesive reservoir recessed in the upright surface are formed. The technique regarding is known (for example, refer patent document 2).

  Furthermore, a technique relating to a glass unit in a gaming machine in which an outer peripheral protruding portion is formed in a holding portion and a glass plate can be fixed to a frame body with a small amount of adhesive is known (for example, see Patent Document 3). Further, a technique relating to a glass body in a gaming machine in which a glass plate is bonded to a frame body via a heat-peelable adhesive to improve recyclability of the frame body and the glass plate is known (for example, see Patent Document 4). ). On the other hand, as a method not using an adhesive, a technique is known in which a frame is formed into a frame shape, a wedge member is inserted into a wedge receiver of the frame, the working end is deformed, and a glass plate is pressed against the frame ( For example, see Patent Document 5).

Japanese Utility Model Publication No.57-047012 JP 2003-126474 A JP 2010-082379 A JP 2009-148426 A JP 2004-166804 A

However, as in the techniques of Patent Documents 1 to 4, the method for producing a double plate glass structure bonded with an adhesive takes time and must prevent the adhesive from protruding. Productivity is not good. In addition, there is a problem that the manufacturing cost tends to be high. In the technique of Patent Document 5, the structure of the frame is complicated, and it takes time to perform the integration through the wedge member, and the productivity may not be improved.
In addition, tempered glass is often adopted as the plate glass. This tempered glass is manufactured by quenching after being cut into a predetermined shape, and variations in external dimensions, plate thickness dimensions, etc. occur, and dimensional management is not easy. Therefore, in the method of inserting and integrating the plate glass into the groove portion of the frame body, there is also a problem that it is not easy to assemble without causing a rattling between the plate glass and the groove portion of the frame body. .

The present invention has been made based on the technical background as described above, and achieves the following object.
The object of the present invention has been made to solve the above-described problems, and is a double transparent plate structure for a ball and ball machine capable of improving productivity, and manufacture of the double transparent plate structure. It is to provide a method.
Another object of the present invention is to provide an elastic material that easily absorbs even if there are variations in the dimensions of the transparent plate and does not cause rattling between the mounting frame and the transparent plate. It is providing the manufacturing method of the double transparent board structure of a ball game machine, and the double transparent board structure.

In order to achieve the above object, the present invention employs the following means.
The double transparent plate structure of the ball game machine of the present invention 1 is
The front part of the ball game machine is formed of a pair of transparent plate bodies in which two transparent plates are arranged substantially in parallel so that the front surface of the game board can be seen through, and a soft thermoplastic resin. And a pair of transparent plate bodies, each having a plate holding groove into which the outer peripheral edge portion is fitted, and a soft holding body for holding the outer peripheral edge portion in the plate holding groove and a hard thermoplastic resin. And an attachment frame body that is provided so as to be fitted on the outer circumference of the soft holding body and attachable to the ball game machine.

The double transparent plate structure of the ball game machine of the present invention 2 is the present invention 1,
The mounting frame body is formed by insert molding in which the pair of transparent plate bodies fitted in the soft holding body is injection-molded in a state of being inserted into an injection mold. .

The double transparent plate structure of the ball game machine of the present invention 3 is the present invention 1,
The mounting frame is formed by joining a pair of divided mounting frames that are divided by a plane parallel to the pair of transparent plates.

The double transparent plate structure of the ball game machine of the present invention 4 is the present invention 3,
The pair of split mounting frames are joined by one joining method selected from laser welding, ultrasonic welding, and adhesion.

The double transparent plate structure of the ball game machine of the present invention 5 is the present invention 1-4,
The pair of transparent plates are made of tempered glass cut into a predetermined size and subjected to a predetermined heat treatment.

The manufacturing method of the double transparent plate structure of the ball game machine of the present invention 6,
A method of manufacturing a double transparent plate structure of a ball game machine in which a front surface of a game board is disposed in a front portion of the ball game machine so as to be seen through, formed of a soft thermoplastic resin, A first step of forming a soft holding body having a plate holding groove for fitting an outer peripheral edge portion of the transparent plate body by injection molding or extrusion molding; and an outer peripheral edge portion of the pair of transparent plate bodies, the soft holding body. A second step for fitting into the plate holding groove to be integrated, and an injection molding die having a mold surface for molding the mounting frame body, and the unit is integrated into the injection molding die. A third step of inserting the soft support body and the pair of transparent plate bodies, and closing the injection mold, and forming a rigid thermoplastic resin in the cavity formed in the injection mold And insert molding, the mounting frame body, the soft holding body, and the front A fourth step of integrating a pair of transparent plates, and a double transparent plate in which the mold for injection molding is opened and the mounting frame, the soft holder, and the pair of transparent plates are integrated And a fifth step of taking out the structure.

The method for producing a double transparent plate structure for a ball game machine according to the present invention 7 is as follows:
The pair of transparent plates are made of tempered glass cut into a predetermined size and subjected to a predetermined heat treatment.

  As described above, the double transparent plate structure (double plate glass structure) of the ball and ball game machine of the present invention has a soft thermoplasticity in order to hold a pair of transparent plate bodies (a pair of plate glass bodies). Since the soft holding body formed of resin is provided, even if there are variations in the dimensions of a pair of transparent plate bodies made of tempered glass, transparent synthetic resin plate, etc., they can be easily absorbed. In addition, since the pair of transparent plate bodies are held by the soft holding body, the pair of transparent plate bodies do not rattle against the mounting frame body. Furthermore, the mounting frame is formed of a hard thermoplastic resin, and can be easily mounted and transported to a ball game machine, a door or the like.

  Furthermore, according to the method for producing a double transparent plate structure of the present invention, a high-productivity injection molding technique is employed to form a soft holding body and a mounting frame body. The productivity of the body (double plate glass constituent body) is improved and the cost can be reduced. This double transparent plate structure can be mass-produced, and this cost reduction effect is great. Moreover, it is possible to automate the carry-in / out operation of the double transparent plate intermediate structure (double plate glass intermediate structure), the double transparent plate structure, and the like, and the productivity can be further improved by this automation.

FIG. 1 is a front view showing a double transparent plate structure of a ball game machine of the present invention. FIG. 2 is a cross-sectional view taken along line AA in FIG. FIG. 3 is an external view showing another embodiment of the soft holding body. FIG. 4 is a flowchart showing a method for manufacturing a double transparent plate structure (double plate glass structure) of a ball game machine. FIG. 5 is an explanatory diagram for explaining a process of manufacturing a mounting frame body of a double transparent plate structure (double plate glass structure) by injection molding, and shows a state before injecting a thermoplastic resin. It is a fragmentary sectional view. FIG. 6 is an explanatory diagram for explaining a process of manufacturing a mounting frame of a double transparent plate structure (double plate glass structure) by injection molding, and shows a state after injecting a thermoplastic resin. It is a fragmentary sectional view. FIG. 7 is a partial cross-sectional view showing another embodiment of the double transparent plate structure, in which the divided divided mounting frames are in a state before joining. FIG. 8 is a partial cross-sectional view showing another embodiment of the double transparent plate constituting body and showing a state after the divided mounting frames are integrally joined.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a front view showing a double transparent plate structure (double plate glass structure), and FIG. 2 is a cross-sectional view taken along line AA of FIG. FIG. 3 is an external view showing another embodiment of the soft holding body.
A double plate glass structure 1 which is a double transparent plate structure is provided on the front of a ball game machine (for example, a pachinko machine), and a transparent transparent plate part (plate glass part) at the center is a liquid crystal inside the pachinko machine. It is transparent so that the player can visually confirm the display, pattern, decorative member, windmill, nail, winning part, fired ball and the like. The double plate glass constituting body 1 is externally fitted and supported by a pair of plate glass bodies 10 which are a pair of transparent plate bodies, a soft holding body 30 for holding the pair of plate glass bodies 10, and an outer peripheral portion of the soft holding body 30. It is comprised from the attachment frame body 20 grade | etc., For this. In the description of this embodiment, the transparent plate body is described as a plate glass body made of tempered glass, but it may be a general transparent plate glass body or a transparent synthetic resin plate body.

  A pair of plate glass bodies (a pair of transparent plate bodies) 10 includes a first plate glass (first transparent plate) 11 and a second plate glass (second transparent plate) 12, and the first plate glass 11 and the second plate glass. Reference numeral 12 denotes a plate glass formed to have a predetermined thickness (for example, 3.2 mm). The first plate glass 11 and the second plate glass 12 are so-called “tempered glass” obtained by performing a quenching process after cutting into a predetermined shape, and several times (for example, 3 to 5) compared to a general plate glass (float plate glass). Times). This method of producing tempered glass is a well-known technique that is produced by heating a plate glass to a predetermined temperature (for example, about 700 degrees), then blowing air on the glass surface, and cooling it uniformly and rapidly. Is omitted. As a countermeasure against fraud, the pair of plate glass bodies 10 has a predetermined interval and a first plate glass 11 and a second plate glass 12 through the soft holding body 30 so that a space is provided therebetween. Are integrally formed in parallel or substantially in parallel. The pair of transparent plate constituting bodies may be a pair of transparent synthetic resin plates, a combination of a transparent synthetic resin plate and a transparent plate glass, or the like.

  The soft holding body 30 is made of a soft thermoplastic resin (for example, a thermoplastic elastomer) that is a soft material. In this embodiment, a soft thermoplastic resin will be described as a thermoplastic elastomer. Thermoplastic elastomers soften and flow at high temperatures and can be molded with plastic processing machines such as compression molding, extrusion molding, injection molding, etc. When cooled (for example, at room temperature), they are rubbery elastic It has properties as a body. In this embodiment, the soft holding body 30 is formed by injecting a thermoplastic elastomer into an injection mold (not shown) and molding it into a ring shape. The soft holding body 30 has a semicircular cross section in which the outer peripheral surface is a R-shaped surface having a high central portion and low at both ends, and the inner peripheral portion 31 is a cylindrical surface, and is formed into a ring shape. It is a thing. In the inner peripheral portion 31 of the soft holding body 30, plate holding grooves 32 and 32 for fitting and holding the outer peripheral edge portions of the first plate glass 11 and the second plate glass 12 are formed as continuous ring grooves. In other words, the soft holding body 30 has a semicircular cross section and is formed in a ring shape, and is parallel to the inner peripheral portion 31 and is separated from the two plate holding grooves 32 and 32 by a predetermined amount. Is formed.

  The soft holding body 30 is configured to fit the outer peripheral edge portions of the first plate glass 11 and the second plate glass 12 in the plate holding grooves 32 and 32 and hold them. At this time, the first glass sheet 11 and the second glass sheet 12 are held in a parallel or substantially parallel state. The soft holding body 30, the first plate glass 11 held in one of the plate holding grooves 32 of the soft holding body 30, and the second plate glass 12 held in the other of the plate holding grooves 32 of the soft holding body 30 are integrally formed. What became becomes the double plate glass intermediate structure 5 which is a double transparent plate intermediate structure.

  When the groove width of the plate holding groove 32 is compared with the plate thicknesses of the first plate glass 11 and the second plate glass 12, the groove width is a dimension smaller than the plate thickness by a predetermined amount. The first plate glass 11 and the second plate glass 12 When the is inserted, the groove is elastically deformed so that it can be fitted. Even if the plate thickness of the first plate glass 11 and the second plate glass 12 is slightly larger than the groove width of the plate holding groove 32, the groove portion is elastically deformed in the groove width direction, and the first plate glass 11 and the second plate glass 12 are plate-held. It can be inserted into the groove 32. As described above, the soft holding body 30 is made of a thermoplastic elastomer, and the plate holding groove 32 is easily elastically deformed. And by performing such dimensional management, it is possible to hold without causing a gap between the plate holding groove 32 of the soft holding body 30 and the outer peripheral edge portions of the first plate glass 11 and the second plate glass 12. it can. Moreover, even if the dimension of the 1st glass plate 11 and the 2nd glass plate 12 varies, it can absorb easily. That is, the first plate glass 11 and the second plate glass 12 do not rattle the soft holding body 30.

  The soft holding body may be composed of a soft holding body 30a formed by extrusion as shown in FIG. The soft holding body 30a is configured such that the outer peripheral edge portions of the pair of glass sheet bodies 10 are fitted in the plate holding grooves 32a and 32a, and the pair of glass sheet bodies 10 are wound around the outer peripheral edge portions of the pair of glass sheet bodies 10. It is to hold. The soft holding body 30a has such a length that both ends of the soft holding body 30a are in contact with each other when wound around the outer peripheral edge. Moreover, when wound around the outer peripheral edge, both ends of the soft holding body 30a may be temporarily fixed with a double-sided tape or the like. Also in this soft holding body 30a, plate holding grooves 32a and 32a are formed in the inner peripheral portion 31a.

  The mounting frame 20 is made of a hard thermoplastic resin (for example, ABS resin (acrylonitrile / butadiene / styrene resin), PC resin (polycarbonate resin), etc.) that is a hard material. The outer peripheral part of the semicircular cross section is provided so as to be fitted and supported. A predetermined number (for example, four in this embodiment) of attachment portions 21 for attachment to a door body (not shown) provided to be openable and closable at the front portion of the pachinko machine is provided on the outer periphery of the attachment frame body 20. ing. The mounting frame 20 is firmly and integrally joined to the outer periphery of the soft holding body 30 by injection molding.

  A mold configuration for insert-molding the mounting frame 20 will be described with reference to FIGS. FIG. 5 is an explanatory diagram for explaining a process of manufacturing a mounting frame body of a double transparent plate structure (double plate glass structure) by injection molding, and shows a state before injecting a thermoplastic resin. FIG. 6 is a partial cross-sectional view showing a state after injecting a thermoplastic resin.

  The injection mold 40 is composed of one mold 42 and the other mold 41, and one mold 42 and the other mold 41 are molds for insert-molding the mounting frame 20. A surface is formed. That is, when one mold 42 and the other mold 41 are combined and closed, the double plate glass intermediate structure inserted into one mold 42, the other mold 41, and the injection mold 40 ( A space defined by the soft holding body 30 and the first plate glass 11 and the second plate glass 12) 5 forms a cavity 45 (see FIG. 5). A gate 46 communicates with the cavity 45. That is, the thermoplastic resin flows into the cavity 45 by being injected from an injection molding machine (not shown) through the gate 46 of one mold 42. The inflowing thermoplastic resin becomes the attachment frame body 20 in which the attachment portion 21 is integrally formed after cooling.

  The manufacturing method of the double plate glass structure (double transparent plate structure) 1 is demonstrated based on FIGS. FIG. 4 is a flowchart showing a method for manufacturing a double plate glass structure.

  A plate glass having a predetermined thickness is cut into a predetermined size and shape, and heat treatment is performed to form a first plate glass 11 and a second plate glass 12 made of tempered glass (step S1). When the first transparent plate and the second transparent plate are transparent synthetic resin plates, the transparent synthetic resin plate having a predetermined thickness is cut into a predetermined size and shape. An injection molding die (not shown) for molding a soft holding body is injected with a thermoplastic elastomer that is heated to a predetermined temperature and pressurized to a predetermined pressure, so that the soft holding made of the thermoplastic elastomer is performed. The body 30 is formed by injection molding (step S2). When the soft holding body is the soft holding body 30a as shown in FIG. 3, the thermoplastic elastomer is extruded and molded.

  The outer peripheral edges of the first glass plate 11 and the second glass plate 12 are fitted into the plate holding grooves 32 and 32 of the soft holding body 30 while elastically deforming the soft holding body 30 in the radial direction, and the soft holding body 30 and the first plate glass 11 are inserted. The double plate glass intermediate structure 5 in which the second plate glass 12 is integrated is manufactured (step S3). When the soft holding body is a soft holding body 30a as shown in FIG. 3, the outer peripheral edge portions of the pair of glass sheet bodies 10 are fitted into the plate holding grooves 32a and 32a, and the outer peripheral edge portions of the pair of glass sheet bodies 10 are fitted. Wrap. The soft holding body 30a wound around the outer peripheral edge portion of the pair of plate glass bodies 10 holds the pair of plate glass bodies 10, and the double plate glass intermediate structure in which the soft holding body 30a and the pair of plate glass bodies 10 are integrated. 5 is manufactured. Further, both ends of the wound soft holding body 30a may be temporarily fixed.

  The injection mold 40 composed of one mold 42 and the other mold 41 is opened, and the double plate glass intermediate structure 5 is inserted into the other mold 41. When the injection mold 40 is closed, a cavity 45 is formed in the injection mold 40 (step S4, FIG. 5). The thermoplastic resin heated to a predetermined temperature and pressurized to a predetermined pressure is injected from the gate 46, and the thermoplastic resin flows into the cavity 45 (step S5, FIG. 6). The thermoplastic resin that is heated and pressurized and flows into the cavity 45 forms the mounting frame 20. At this time, the outer peripheral surface of the soft holding body 30 and the inner peripheral surface of the mounting frame body 20 are firmly and integrally joined. Further, the attachment frame 21 is integrally formed with an attachment portion 21. After the thermoplastic resin cools, the injection mold 40 is opened, and the double plate glass structure 1 in which the pair of plate glass bodies 10, the soft holding body 30 and the mounting frame body 20 are integrated is taken out from the injection mold 40. (Step S6). In addition, the operation | work which carries in this double plate glass intermediate structure body 5 in the injection mold 40, the operation | work which takes out the double plate glass structure body 1 out of the injection mold 40, etc. conveys robots, loaders, etc. Means are preferably provided and automated. For example, it may be a conveying means that adsorbs and conveys plate glass or the like.

[Other Embodiments of Double Transparent Plate Constituent]
Another embodiment of the double transparent plate structure (double plate glass structure) will be described with reference to FIGS. FIG. 7 shows a state before the divided mounting frame body is joined, and FIG. 8 is a partial cross-sectional view showing a state after the divided mounting frame body is joined. The attachment frame body 120 of this other embodiment is composed of a first divided attachment frame body 121 and a second divided attachment frame body 122 (see FIG. 7). In the first divided mounting frame body 121 and the second divided mounting frame body 122, the outer peripheries of the semi-circular cross section of the soft holding body 30 are fitted half by half, and then the respective joint surfaces 121a and 122a are joined. .

  The joining surfaces 121a and 122a are joined by welding by laser irradiation, adhesion by an adhesive, welding by ultrasonic irradiation, or the like. The laser irradiation method is such that one of the first divided mounting frame body 121 and the second divided mounting frame body 122 is made of a laser non-transparent resin (laser absorbing resin) and the other is made of a laser transparent resin. Good. When the laser is irradiated from the laser transmitting resin side, the laser passes through the laser transmitting resin and generates heat and is welded between the bonding surface 121a and the bonding surface 122a. In the method of bonding with an adhesive, the bonding surfaces are bonded with the adhesive force of the adhesive. In the method of bonding by ultrasonic irradiation, fine ultrasonic vibration and pressure are applied between the bonding surface 121a and the bonding surface 122a, and the molten heat is instantaneously melted and bonded.

  While various embodiments have been described above, the present invention is not limited to these embodiments. Needless to say, changes can be made without departing from the scope and spirit of the present invention. For example, the shape of the pair of transparent plate bodies (a pair of plate glass bodies), the soft holding body, the mounting frame body, and the like can be appropriately changed to the shape and size corresponding to the type of the ball game machine. Not too long. Further, the outer shape of the soft holding body and the cross-sectional shape of the inner diameter portion of the mounting frame may be other shapes (for example, elliptical shape, oval shape, square shape, rectangular shape, triangular shape, polygonal shape, etc.) Good.

1 ... Double transparent plate structure (Double plate glass structure)
5 ... Double transparent plate intermediate structure (double plate glass intermediate structure)
10 ... A pair of transparent plate bodies (a pair of plate glass bodies)
11 ... 1st transparent plate (1st plate glass)
12 ... Second transparent plate (second plate glass)
DESCRIPTION OF SYMBOLS 20, 120 ... Mounting frame 30 ... Soft holding body 32 ... Plate holding groove 40 ... Injection mold 121 ... 1st division | segmentation attachment frame 122 ... 2nd division | segmentation attachment frame

Claims (7)

A pair of transparent plates, in which two transparent plates are arranged substantially in parallel so that the front of the game board can be seen through the front part of the ball game machine;
It is formed of a soft thermoplastic resin, and has a plate holding groove into which the outer peripheral edge of each of the pair of transparent plate bodies is fitted in the inner peripheral part, and holds the outer peripheral part by fitting into the plate holding groove. A soft carrier,
It is formed of a hard thermoplastic resin, and includes an attachment frame body that is fitted around the outer periphery of the soft holding body and is attachable to the ball game machine. Double transparent plate structure of a ball game machine. In the double transparent plate structure of the ball game machine according to claim 1,
The mounting frame body is formed by insert molding in which the pair of transparent plate bodies fitted in the soft holding body is inserted into an injection mold. Double transparent plate structure of a ball game machine. In the double transparent plate structure of the ball game machine according to claim 1,
The mounting frame body is formed by joining a pair of divided mounting frame bodies divided by a plane parallel to the pair of transparent plate bodies. In the double transparent plate structure of the ball game machine according to claim 3,
The pair of split mounting frames are joined by one joining method selected from laser welding, ultrasonic welding, and adhesion. A double transparent plate structure for a ball game machine. In the double transparent plate structure of the ball game machine according to any one of claims 1 to 4,
The pair of transparent plate bodies are made of tempered glass cut into a predetermined size and subjected to a predetermined heat treatment. A double transparent plate structure for a ball game machine. A method for manufacturing a double transparent plate structure of a ball game machine in which a front surface of the game board is disposed in a front portion of the ball game machine so as to be seen through,
A first step of forming a soft holding body formed of a soft thermoplastic resin and having a plate holding groove for fitting an outer peripheral edge of a pair of transparent plate bodies by injection molding or extrusion molding;
A second step for fitting the outer peripheral edge portions of the pair of transparent plate bodies into the plate holding groove of the soft holding body so as to be integrated;
Open an injection mold having a mold surface for molding the mounting frame, and insert the integrated soft holding body and the pair of transparent plate bodies into the injection mold. And the process of
The injection mold is closed, a hard thermoplastic resin is injected into a cavity formed in the injection mold to perform insert molding, and the mounting frame body, the soft holding body, and the pair A fourth step of integrating the transparent plate of
A fifth ball ball game machine comprising: a fifth step of opening the injection mold and taking out the mounting frame body, the soft holding body, and a double transparent plate structure in which the pair of transparent plate bodies are integrated. Method for manufacturing a double transparent plate structure. A method for producing a double transparent plate structure for a ball game machine according to claim 6,
The pair of transparent plate bodies are made of tempered glass cut into a predetermined size and subjected to a predetermined heat treatment. A method of manufacturing a double transparent plate structure for a ball game machine.

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