JP2925053B2 - Front panel for pachinko machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pachinko machine for seeing through a game board, and more particularly to a front plate for a pachinko machine having a double-layer glass structure.

[0002]

2. Description of the Related Art Conventionally, it is known to use a double glazing as a front plate for a pachinko machine, thereby preventing fraudulent acts such as changing a traveling path of a ball by a magnet, and an inner glass. Although the aim is to suppress the noise generated when a hit ball collides with a double-glazed glass structure, etc., it is insufficient to suppress the noise.

Japanese Utility Model Application Laid-Open No. 59-183282 discloses that a transparent resin layer is applied to the surface of a glass plate in front of a game board, and in particular, that a transparent resin layer is provided on the side facing the game board.
The aim is to reduce the impact sound of hit balls with an elastic resin, but the resin is significantly worn and cannot be put to practical use.

Japanese Patent Application Laid-Open No. 1-285283 discloses a hard plate (glass plate) on a side of a front plate for a pachinko machine which corresponds to a play board.
In the disclosure that the opposite side has a polymerized structure with an adhesive resin portion, a multilayer polymerized structure in which an adhesive resin portion is interposed between a hard plate (glass plate) and a hard plate (glass plate) is disclosed. That, furthermore, adopting a pair of the multilayer polymerization structure to form a multilayer structure, using a polyester resin or an acrylic resin as an adhesive resin portion in the multilayer polymerization structure, flowing those resin stock solutions between hard plates (glass plates). , And cured. However, a remarkable noise reduction effect cannot be obtained simply by using a polyester resin or an acrylic resin.

The present inventors have investigated and confirmed the sound range of the collision sound in order to effectively reduce the sound of the collision between the glass plate and the hit ball, and then intensively studied the configuration of the front plate effective for reducing the sound range. As a result, the present invention has been completed.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a front panel for a pachinko machine which is spaced apart in front of a game board, and has an inner glass plate disposed on the side facing the game board and an outer glass disposed outside the same. Plate and rubber on resin frame with a substantially convex cross section
Adhering through the adhesive, the vibration of the inner glass plate
A double-layered glass structure that suppresses propagation to the player side through , and at least the inner glass plate
Laminated with two glass plates stuck together via a resin adhesive layer
Made of glass, the resin adhesive layer has a thickness of 0.2 to 1 mm
Ethylene vinyl acetate based, polyvinyl acetal
Consisting of resin or polyvinyl chloride resin
And suppressing the noise level near the frequency of 6300 Hz .

In the present invention, it has been found that the noise due to the collision between the glass plate and the hit ball is in a frequency region having a peak around about 6300 Hz. According to the above configuration, the effect of effectively suppressing the sound in this region is obtained. Is played.

[0008]

The present invention will be described in detail below by way of examples. FIG. 1 is a schematic view showing the arrangement of a front plate in a pachinko machine, as viewed substantially from the front, and FIG. 2 is an enlarged partial longitudinal sectional view of the front plate.

In FIG. 1, 1 is a pachinko machine main body, 2 is a game board thereof, 3 is a front plate, and the front plate 3 is a frame 4 attached to the main body 1 by a hinge mechanism (not shown) so as to be freely opened and closed.
And an outer glass plate 5 with four sides attached and attached to the frame 4
, And an inner glass plate 6.

In the front plate 3 shown in FIG. 2, the frame body 4 is made of a resin, for example, a styrene resin, a polyester resin or an acrylic resin in consideration of lightness, handleability and the like.
These resins also have the effect of suppressing the vibration (sound waves) of the inner glass plate 6 from propagating to the player through the frame 4.

The frame 4 has a substantially convex cross section as shown in the figure, and has an outer glass plate 5 and an inner glass plate 6 on both sides.
Are adhered via rubber adhesives 10, 11, for example, silicone-based adhesives. The rubber adhesives 10 and 11 have elasticity, suppress the propagation of the vibration of the inner glass plate 6 to the frames 4 and 4, and also employ a material having excellent weather resistance and durability. In addition to silicone-based rubber adhesives such as polysulfide-based and butyl-based rubber adhesives can be used. Reference numeral 4 'denotes a moisture absorbent disposed on an appropriate side of the frame 4 so as to dry the air in the internal space.

Although the distance between the outer glass plate 5 and the inner glass plate 6 is not specified, it is set to 7 to 8 mm or more in consideration of preventing the above-mentioned misconduct by the magnet. What is necessary is just to set suitably considering the space etc.

The inner glass plate 6 includes glass plates 7 and 8 having a thickness of 1 mm to several mm, a polyvinyl acetal resin (for example, polyvinyl butyral resin) interposed between the glass plates and bonding the two glass plates, an ethylene vinyl acetate resin,
Alternatively, a laminated glass comprising a resin adhesive layer 9 selected from a polyvinyl chloride resin is used. These resin adhesive layers 9
Is important in suppressing vibrations (sound waves) when a hit ball collides with the glass plate 6, particularly noise in the vicinity of a frequency of 6300 Hz.
In order to exert its effect, a thickness of 0.2 mm or more is required.On the other hand, even if the thickness exceeds 1 mm, no remarkable increase in noise suppression effect is observed, and the cost increases, so that the thickness is in the range of 0.2 mm to 1 mm. Is what you do.

The outer glass plate 5 has a thickness of several mm to 7 mm.
A single glass plate of about 8 mm may be used, but it is preferable to use a laminated glass structure similar to the inner glass plate 6 in order to reduce noise more effectively.

The laminated glass can be easily formed by sandwiching an original resin film between glass plates and welding the film by ordinary means such as pressing and heating.

Although the internal space is usually an air space, a sound-insulating gas such as sulfur hexafluoride may be appropriately filled.

It is within the scope of the present invention that the surface of the outer glass plate 5 is subjected to anti-reflection treatment, and that the two glass plates 5, 6 are appropriately colored glass as long as the transparency is not impaired. Of course, tempered glass or semi-tempered glass can be appropriately used for part or all of the glass plate.

The outer glass 5 or the inner glass 6
It is also possible to apply a conductive wire for crime prevention on the surface of the device, attach a magnetic net, or insert the wire or the net between the two glass plates 5 and 6 via the resin adhesive layer 9. This is within the scope of the invention.

Further, based on the above configuration, it is also possible to appropriately take a design such as attaching a damping material piece to an appropriate place such as a corner of the innermost glass plate to further reduce noise.

[Test Example] Various inner glass plates and outer glass plates were mounted on a frame (made of styrene resin, approximately 41 cm × 40 cm) of the front plate of a pachinko machine in the form shown in FIG. Was pasted through. Next, the frame was attached to a pachinko machine as shown in FIG. 1, and the noise was measured.

The structures of the glass plate and the resin adhesive layer of various front plates are shown in Examples 1 to 5 and Comparative Examples 1 to 3 in Table 1. In the table, G is float glass manufactured by Central Glass Co., Ltd., PVB is polyvinyl butyral resin manufactured by Sekisui Chemical Co., Ltd., EVA is ethylene vinyl acetate resin manufactured by Takeda Pharmaceutical Co., Ltd., and PVC is polyvinyl manufactured by Sekisui Chemical Co., Ltd. Chloride resin, ACR
Indicates an acrylic resin sold by PMG Corporation. The acrylic resin is obtained by arranging two glass plates at an interval, sealing an end face portion, and flowing a resin stock solution and a curing catalyst into the interval to cure the resin. The numerical values in the table represent the thickness (mm) of each glass plate and resin adhesive layer.

[0022]

[Table 1]

Separately, for several kinds of commercially available polyester resins (alkyd resins, etc.), a laminated glass was tried in the same manner as in the case of using the above-mentioned acrylic resin. As a result, the desired product was not obtained. Therefore, the assembly of the front panel and the noise measurement were abandoned.

In the test method, a microphone is set at a vertical distance of about 20 cm opposite to the center of the front plate, and the noise level is measured by a noise measuring instrument in a frequency range of 100 Hz to 20000 Hz. The sound generated by hitting was measured and recorded.

The impact sound between the hit ball and the glass plate has a frequency of about
It is an unpleasant metallic noise around 6300Hz, and it is important to control noise in this frequency range. Table 1 shows the noise level around the frequency as a measurement result.

Comparative Example 1 is a conventional front plate structure, whereas Examples 1 to 5 show the structure of the present invention, in which noise is remarkably suppressed to 10 dB or more, and Was reduced to less than one-half.

Comparative Example 3 employs an acrylic resin as the adhesive resin layer, but does not show the same effect as the embodiment in the frequency range. Comparative Example 2 employs the laminated glass structure only for the outer glass plate, but is inferior to the examples.

[0028]

According to the present invention, a remarkable effect is obtained in suppressing noise at a frequency of about 6300 Hz, which is a collision sound between a glass plate and a hit ball.

[Brief description of the drawings]

FIG. 1 shows an arrangement of a front plate in a pachinko machine.
It is the schematic diagram seen from substantially the front.

FIG. 2 is an enlarged partial longitudinal sectional view of a front plate.

[Explanation of symbols] 3 ---- Front plate 4 ---- Frame 5 ---- Outside glass plate 6 ---- Inner glass plate 7, 8 ---- Glass plate 9 ---- Adhesion Resin layer 10, 11 ---- Silicone adhesive

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-1-285283 (JP, A) JP-A-3-112835 (JP, A) JP-A-3-124440 (JP, A) JP-A-3- 124441 (JP, A) JP-A-3-124733 (JP, A) JP-A-4-254444 (JP, A) JP-A-5-138840 (JP, A) (58) Fields investigated (Int. ⁶ , DB name) A63F 7/02

Claims (2)

(57) [Claims] 1. A front panel for a pachinko machine spaced apart in front of a game board, wherein an inner glass plate disposed on a side facing the play board and an outer glass plate disposed outside the same are substantially convex in cross section.
Pasted on the resin frame of the shape via rubber adhesive
The vibration of the glass plate propagates to the player through the frame
A front panel for pachinko machines, characterized by a suppressed double-glazed structure. 2. The method according to claim 1 , wherein at least the inner glass plate has
Laminated glass with two glass plates stuck together via a resin adhesive layer
Wherein the resin adhesive layer has a thickness of 0.2 to 1 mm.
Renvinyl acetate, polyvinyl acetal,
Or polyvinyl chloride resin.
The front panel for a pachinko machine according to claim 1, wherein a noise level around several 6300 Hz is suppressed .