JP2003088618A - Speaker system for game machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a speaker system for a game machine, which can provide a high sound quality to a speaker device being provided in the game machine without becoming an obstacle for the maintenance work on the machine rear side for the game machine. SOLUTION: An upper ball tray 15 is attached to the front surface of the game machine 10, and is expand-formed in such a manner that the inside may form a hollow state. In such an upper ball tray 15, first and second enclosures E1 and E2 which are constituted into an enclosure structure are provided. Then, speaker units 23 and 25 for middle and high tones are arranged in both enclosures E1 and E2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gaming machine speaker system.

[0002]

2. Description of the Related Art Generally, a gaming machine such as a pachinko machine is equipped with a gaming machine speaker device for producing various sound effects (prize sound, etc.) according to various gaming states inside the gaming machine. ing. That is, a middle frame (also referred to as an inner frame), which is also called a mounting frame of the game machine, is installed in an outer frame forming an outer frame of the game machine, and the speaker device is arranged in a lower portion of the front side of the middle frame. It is set up. By the way, in the lower part of the front side of the middle frame in which this speaker device is arranged, there are respective ball discharge ports for discharging game balls from the ball payout device on the back side of the machine to the upper bowl plate and the lower bowl plate on the machine front side. Besides being formed, launch rails and the like are also provided. Therefore, the installation space of the speaker device is limited, and as a result, a small speaker unit has been conventionally used for the speaker device.

On the other hand, recently, as a part of enhancing the interest in the game machine, it is desired to improve the sound quality of the sound emitted from the speaker device. However, in the small speaker unit as described above, the performance of the speaker unit is improving year by year, but due to its characteristics,
The bass was not powerful enough, and its sound quality never satisfied the player.

In view of such circumstances, a speaker system as disclosed in, for example, Japanese Patent Laid-Open No. 8-19638 has been proposed. That is, in the speaker system described in this publication, a speaker box accommodating a speaker unit is arranged not at the inside of the game machine but at the rear of the game machine, which has a relatively large space, outside the machine. Then, a sound effect or the like from the speaker unit is emitted from a sound emission port formed on the machine front side through a duct formed so as to penetrate the middle frame of the gaming machine in the front-rear direction. Therefore, according to the speaker system described in this publication, since the speaker unit is not provided inside the machine, the speaker unit can be made larger, and the reproduction band can be widened to achieve high sound quality. .

[0005]

However, in the speaker system described in the above publication, the speaker box that accommodates the speaker unit is arranged outside the game machine in a separate structure from the game machine. , I had the following problems. That is, in the gaming machine, on the back side of the gaming machine, which faces the rear of the gaming machine, various gaming machine board components such as a control board and a ball payout device are provided. And, for these gaming machine constituent members, maintenance work such as member replacement may be frequently performed regardless of whether they are regular or irregular. Therefore, as described above, if a speaker box that is separate from the gaming machine is provided outside the gaming machine, there is a problem that maintenance work on the back side of the gaming machine is difficult.

The present invention has been made to solve the above problems, and an object thereof is to improve the sound quality of a speaker device provided in a gaming machine without hindering maintenance work on the back side of the gaming machine. It is an object of the present invention to provide a speaker system for a game machine capable of achieving the above.

[0007]

In order to solve the above problems, the invention as set forth in claim 1 is an upper ball which is bulged to the front side of the machine body so as to have a hollow inside. The gist of the present invention is that the inside of the dish serves as a speaker accommodating portion, and at least the mid-high range speaker unit is attached to the speaker accommodating portion so that the front surface of the unit faces the machine front side.

According to a second aspect of the present invention, in the gaming machine speaker system according to the first aspect, the speaker accommodating portion has an enclosure structure in which the speaker accommodating portion includes at least a speaker unit for middle and high frequencies. What is done is the summary.

According to a third aspect of the present invention, in the gaming machine speaker system according to the second aspect, the speaker accommodating portion has a bass reflex port formed in a front surface portion of the upper bowl and the port. The gist is that the communicating bass reflex duct has a bass reflex type enclosure structure provided in the speaker housing portion.

According to a fourth aspect of the present invention, in the gaming machine speaker system according to the third aspect, the bass reflex duct has a labyrinthine duct structure that is extended and bent in the speaker accommodating portion. And

According to a fifth aspect of the present invention, in the gaming machine speaker system according to the fourth aspect, the bass reflex duct has a horn-shaped duct structure in which the width of the duct increases as the width approaches the bass reflex port. That is the main point.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment in which the present invention is embodied in a gaming machine speaker system in a pachinko gaming machine (hereinafter referred to as "gaming machine") will be described with reference to FIGS.

As schematically shown in FIG. 1, the gaming machine 10 according to the present embodiment is provided with an outer frame 11 that is a vertical rectangular frame shape in a front view and forms an outer contour of the machine body. On the front side of the opening of the outer frame 11, a vertical rectangular middle frame 12 in which a plurality of types of gaming machine constituent members are mounted and set is removably assembled. On the front side of the middle frame 12, a front frame 14 provided with a glass frame for transparently protecting the game board 13 arranged inside the machine is assembled and aligned so as to be openable and closable in a sideways open state. On the lower side of 14, an upper bowl 15 is assembled and aligned with the middle frame 12 so as to be openable and closable in a laterally opened state. Further, on the front surface side of the middle frame 12, a hitting ball launching device 16 and a lower ball plate 17 are mounted below the assembly matching region of the upper ball plate 15.

The upper ball dish 15 is entirely made of synthetic resin, and as shown in FIGS. 2 and 3, the dish member 31,
The outline is composed of the upper bowl cover member 32, the holding plate 33, and the bottom plate 34. The dish member 31 is the upper bowl 1
The upper surface of 5 is configured to store game balls paid out from the machine. The upper bowl plate cover member 32 is a plate member that constitutes the front surface portion of the upper bowl plate 15, and is formed to be curved so as to bulge toward the front surface side. In addition, the holding plate 33
Form the back surface of the upper bowl 15 and are formed in a flat plate shape. As a result, the upper bowl 15 is formed such that the inside surrounded by the dish member 31, the upper bowl cover member 32, the holding plate 33, and the bottom plate 34 is hollow.

As shown in FIG. 1, the front surface of the upper bowl plate 15, that is, the upper bowl plate cover member 32, divides the length of the upper bowl plate cover member 32 into three equal parts when viewed from the front. A first sound emission port 19 and a second sound emission port 20 formed of a large number of small holes are formed at two locations. Also, the both sound emission ports 1
In the vicinity of the right side of the first sound emitting port 19 located on the left side of the ninth and the twenty, a third sound emitting port 21 composed of a large number of small holes is formed so as to function as a bass reflex port. Then, as schematically shown in FIG. 3, a plurality of (two in the present embodiment) enclosures E1 are provided inside the hollow upper bowl plate 15 and on the back surface side of the upper bowl plate cover member 32. E2
Is formed by the upper bowl cover member 32 and the partition wall 22. In the present embodiment, the inside of the upper bowl 15 and particularly the enclosures E1 and E2 correspond to the speaker accommodating portion. In the sectional view of the upper bowl 15 shown in FIG. 3, the first to third sound emission ports 19, 20, 21 are not shown.

Of the enclosures E1 and E2, the first speaker unit 23, which is a cone-shaped speaker, is arranged in the first enclosure E1 on the left side in FIG. 3 to construct the first speaker device S1. In the following description, the “speaker unit” is also referred to as “speaker”. The first speaker 23 is a mid-high range speaker unit capable of suitably reproducing mid-range and high-range sounds, and a synthetic fiber that allows passage of the sound emitted from the speaker 23 on the front surface (the side on which the diaphragm is located). A protective cover 24 made of a material is covered. And this protective cover 24
The first speaker 23 covered with is the speaker 23
Is attached to the back surface side of the upper dish cover member 32 in a state where the front surface portion thereof is aligned with the first sound emission port 19.
Therefore, the front surface portion of the first speaker 23 is in direct contact with the atmosphere outside the gaming machine 10 via the first sound emission port 19, and the reproduced sound from the speaker 23 is raised without being covered. It can be reproduced and output with sound quality. In addition, the front cover of the first speaker 23 can be preferably protected by the protective cover 24 without deteriorating the sound quality.

When the first speaker 23 is mounted on the back side of the upper dish cover member 32, the first enclosure E1 has no sound outlet other than the first sound emission port 19, and has a box shape as a whole. It is a closed type enclosure structure. The capacity of the first enclosure E1 is designed according to a predetermined calculation formula so as to be an appropriate capacity. A speaker device in which a speaker unit is enclosed in a speaker housing portion (enclosure) having such a sealed enclosure structure is generally called a sealed speaker. And in this embodiment,
The first speaker device S1 is configured as a closed speaker.

On the other hand, the second enclosure E on the right side in FIG.
The second speaker unit 25 is a cone-shaped speaker
Are arranged to construct the second speaker device S2. The second speaker 25 is also a mid-high range speaker unit capable of suitably reproducing mid-range and high-range sounds, and a protective cover 26 made of a synthetic fiber material that allows passage of the sound emitted from the speaker 25 is provided on the front surface thereof. It is covered. The second speaker 25 covered with the protective cover 26 is mounted on the rear surface side of the upper dish cover member 32 with the front surface of the speaker 25 aligned with the second sound emission port 20. There is. Therefore, the front surface of the second speaker 25 is in direct contact with the atmosphere outside the gaming machine 10 via the second sound emission port 20, and the speaker 25
High-quality sound can be played back and output without playing back the sound from. Further, the protection cover 26 can suitably protect the front surface of the second speaker 25 without degrading the sound quality.

As shown in FIG. 3, the second enclosure E2 has a larger capacity than the first enclosure E1. In the second enclosure E2, a maze-like duct in which a bass reflex duct (also referred to as a resonance tube) 27 extending from the position near the back surface of the second speaker 25 to the third sound emission port 21 is extended and bent by the partition wall 22. It is formed to have a structure. Therefore, the back surface portion of the second speaker 25 is in direct contact with the atmosphere outside the gaming machine 10 via the bass reflex duct 27 and the third sound emission port 21, and the sound output via the bass reflex duct 27. High-quality sound can be reproduced and output without the need for a cage.

Therefore, when the second speaker 25 is mounted on the back side of the upper dish cover member 32, the second speaker 25
The enclosure E2 has a bass reflex duct 27 communicating with the third sound emission port 21, which is a bass reflex port, inside, and has a box-shaped bass reflex type enclosure structure as a whole. The capacity of the second enclosure E2 is designed to be an appropriate capacity for low-pitched sound reproduction. However, the degree of freedom in capacity design is higher than in the case of the first enclosure E1. In addition, a speaker device in which a speaker unit is included in a speaker accommodating portion (enclosure) having such a bass reflex type enclosure structure is generally called a bass reflex type speaker (phase inversion type speaker). And in this embodiment,
The second speaker device S2 is configured as a bass reflex type speaker (phase inversion type speaker).

Here, the inside of the bulged upper bowl plate 15 is not so much restricted in space as compared with the lower portion on the front surface side of the middle frame 12 in which many game machine components are arranged. Therefore, each speaker 2 arranged in the upper bowl 15
A relatively large speaker having a wide low-frequency reproduction band can be used for 3, 25, and the first and second speaker devices S
It is possible to reproduce and output high-quality sound from 1 and S2. Further, since the space inside the upper bowl plate 15 is not so restricted, it can be easily realized even when the enclosures E1 and E2 are to be made large.

Next, the operation of the gaming machine 10 according to this embodiment configured as described above will be described. Now, this game machine 1
When 0 is installed in a game arcade or the like, the outer frame 11 is first erected on an installation frame base (not shown), then the front frame 14 and the upper bowl plate 15
A middle frame 12 for mounting game machine constituent members such as is assembled and aligned with the outer frame 11. At this time, since the first and second speaker devices S1 and S2 are previously arranged inside the bulging upper bowl plate 15, they are carried with the gaming machine 10. Therefore, in order to provide high-quality sound, the installation work is performed more easily than in the conventional case where the speaker system is separate from the gaming machine 10.

In the usage state of the gaming machine 10, when a predetermined gaming state such as winning occurs in the gaming machine 10, each speaker device S1 is based on a voice control signal output from a voice control board (not shown). , S2 reproduces and outputs various sound effects. When reproducing and outputting the sound effect, it is possible to output reproduced sound with good sound quality from the first speaker device S1 configured as a closed speaker and the second speaker device S2 configured as a bass reflex speaker. It

Further, when performing maintenance work on the back side of the gaming machine 10, in order to output a high-quality sound, unlike the conventional case in which a speaker box having a separate structure is provided on the rear side outside the machine, the front side of the gaming machine 10 is different. The first and second speaker devices S1 and S2 provided in the upper spherical dish 15 located on the side do not hinder maintenance work.

Here, the characteristics of the speaker will be described. In the speaker, when the diaphragm moves forward, the air density of the front surface (front surface) becomes high and at the same time the air density of the rear surface (rear surface) becomes low. When moves backward, the air density on the back becomes high and at the same time the air density on the front decreases. In addition, there is a 180-degree phase difference between the sound emitted from the front (front) of the speaker and the sound emitted from the back (rear) of the speaker. If the phase of the sound from the front is the normal phase, The phase of sound becomes opposite. Therefore, unless there is a structure (baffle plate) that isolates the air in front of and behind the speaker, a low-pitched sound whose directivity is dull compared to a high-pitched sound does not advance forward because the sound wave reciprocates around the speaker. As a result, in such a speaker, the low-pitched sound from the normal phase emitted from the front and the low-pitched sound from the opposite phase canceling each other cancel out each other, which causes a situation in which only the treble is emphasized and the bass is not clearly heard. I will end up.

Therefore, in order to prevent such a situation from occurring, when a speaker device is constructed, a structure (baffle plate) for isolating air in front of and behind the speaker is usually provided as an enclosure for the speaker. Here, the term “enclosure” refers to a structure in which the speaker unit is mounted, but does not necessarily mean only a complete box-shaped structure. That is, as long as it is a structure capable of preventing the cancellation of the normal low-pitched sound emitted from the front of the speaker and the negative low-pitched sound emitted from the rear, it is possible to use a flat baffle plate or such a baffle plate. The back-opened cabinet form with the corner bent backward is also included in the technical concept of "enclosure" in the present specification. In the first and second speaker devices S1 and S2 configured in consideration of the characteristics of the speaker, the speaker accommodating portions (first and second enclosures E1 and E2) have a box-shaped enclosure structure. Therefore, it has the following functions.

First, in the case of the first speaker device S1 which is a hermetically sealed speaker, the interference of air having different densities before and after the speaker 23 forms the first hermetically sealed enclosure structure.
It is completely shut off by the enclosure E1. Therefore,
The normal-phase sound emitted from the front of the speaker 23 and the negative-phase sound emitted from the back of the speaker 23 do not cancel each other. Also, FIG.
As shown in FIG. 5, the first enclosure E1 has a wide width and a shallow depth when viewed from the front. Therefore, in this first speaker device S1, since air pressure from the back surface is applied to the speaker 23 in the first enclosure E1, middle and high tones with good sound quality are reproduced and output, and there is also a small amount of bass, but there is tightness. Crisp bass reproduction is possible.

On the other hand, the bass reflex type speaker like the second loudspeaker device S2 utilizes the phenomenon that sound waves resonate in the cavity (that is, the volume of the enclosure E2) and the tube (that is, the bass reflex duct 27). It is a speaker that supplements the volume feeling in the low-pitched sound range by resonating the sound of (1) with the cavity and the cylinder. Therefore, the enclosure (speaker accommodating portion) is easier to obtain the bass volume than the closed type speaker having the closed type enclosure structure, and is a speaker suitable for bass enhancement. As a result, powerful low-pitched sound can be reproduced, and on the other hand, low-pitched sound can be enhanced without providing a low-pitched speaker, so that the speaker device S itself can be made very compact.

From the above, the speaker accommodating portion (first and second enclosures E1,
The first and second speaker devices S1 and S2 including E2) are
Although only the mid-high range speaker 23 is provided, it is possible to surely reproduce not only the mid-high range but also the low range. In addition, since the speaker units 23 and 25 are individually and independently arranged in the dedicated enclosures E1 and E2, the sound reproduced and output from the other speaker units arranged in the other enclosures can be obtained. Conflicts are avoided and each enclosure E1,
The reproduced sound of the speaker units 23 and 25 arranged in the E2 can be reproduced with high quality as a transparent sound without being caught.

Next, the principle of bass reproduction in the second speaker device S2 configured as the bass reflex type speaker as described above will be described in detail below. As described above, the sound emitted from the front (front) of the speaker and the sound emitted from the back (rear) of the speaker have a phase difference of 180 degrees, and when the phase of the sound from the front is positive, The sound from the back has the opposite phase. Therefore, when the total length of the bass reflex duct in the bass reflex type speaker is L,
Among the sounds emitted from the speaker, the sound with a frequency of which the wavelength is L cancels out the sound emitted from the front and the sound emitted from the back, so that the bass cannot be enhanced.
However, in the case of a sound having a frequency of which the wavelength is 2L, the sound emitted from the front and the sound emitted from the back are in phase, so that both sounds do not cancel each other out, and the bass can be enhanced.

Therefore, in the second speaker device S2,
The bass reflex duct 27 formed in the second enclosure E2 is configured to have a labyrinthine duct structure in which extension bending is performed as shown in FIG. 3, and first, the overall length L of the bass reflex duct 27 can be secured long. . By the way, in the case of the gaming machine (pachinko machine) 10 of the present embodiment, the machine base size is also related, but by making the maze shape as shown in FIG. 3,
The total length L of the bass reflex duct 27 is about 0.7 m. Further, it is generally said that, in the case of a sound having a wavelength of 2 L or less, a low frequency reproduction band (reproduction limit frequency of low sound) is up to a frequency of about 0.7 times 2 L.

Therefore, on the basis of such a premise, in the case of the bass reflex duct 27 of the second speaker device S2 which is formed by extending and refracting in a labyrinth so that the total length L becomes 0.7 m, the bass reflex duct 27. If the cross-sectional area and the diaphragm area of the speaker 25 are the same, the wavelength of 2L is 1.4m.
(= 2 × 0.7 m). That is, it is possible to enhance the bass sound when the wavelength is 1.4 m.
Since the bass frequency in this case is 243 Hz (= sonic velocity 340 m / sec ÷ 1.4 m), the low-frequency band is 170 Hz (= 243 Hz × 0.7 times). Therefore, if the bass reflex duct 27 is extended and bent to form a labyrinthine duct structure as described above, the total length L of the bass reflex duct 27 can be kept long even if the machine stand size is small. Therefore, in the second speaker device S2. It is possible to set the low-frequency band that can enhance the bass to a lower level. Therefore, a so-called deep bass having more power can be produced.

FIG. 4 is a diagram showing the reproduced sound pressure frequency characteristic f obtained by measuring the acoustic output from the speaker system including the first and second speaker devices S1 and S2. In FIG. 4, the horizontal axis of the graph represents the frequency (Hz) of the reproduced sound that is output, and the vertical axis of the graph represents the sound pressure level (db) of the reproduced sound that is output. On the other hand, FIG. 5 is a diagram showing a reproduced sound pressure frequency characteristic f1 in a normal gaming machine speaker system (comparative example) attached to the lower portion of the front side of the middle frame 12 as in the prior art. The reproduced sound pressure frequency characteristic f shown in both figures,
Comparing the graphs of f1 with each other, in the case of the speaker system of FIG. 5, the low frequency reproduction band extends only up to about 350 Hz, whereas in the case of the speaker system of the present embodiment of FIG. It can be understood that the low frequency reproduction band extends up to around 170 Hz.

Therefore, according to the above embodiment, the following effects can be obtained. (1) First and second enclosures E1 and E2 forming speaker housings in the speaker devices S1 and S2
Was placed in the hollow inside of the bulged upper bowl plate 15. That is, the inside of the upper bowl 15 is less subject to space restrictions than the installation site in the lower portion on the front surface side of the middle frame 12 in which many game machine components are arranged. Therefore, the speaker units 23 and 25 in the speaker devices S1 and S2 can be relatively large speakers having a wide low-frequency band, and the speaker devices S1 and S2 can be used.
Can reproduce and output high-quality sound effects.

(2) Moreover, each of the enclosures S
As described above, since S1 and S2 are provided on the upper bowl plate 15 located on the front side of the machine body, while enhancing the bass part, unlike the conventional case, they are frequently provided on the back side of the gaming machine 10. It does not hinder the maintenance work such as the substrate replacement performed at the same time.

(3) In each of the speaker devices S1 and S2, the upper bowl plate cover member is a structure (baffle plate) that prevents the sounds emitted from the front and back of the speakers 23 and 25 from canceling each other out. Since the enclosures E1 and E2 composed of 32 and the partition wall 22 are adopted, it is possible to surely reproduce not only the mid-high range but also the low range from the speaker units 23 and 25.

(4) Further, in each of the speaker devices S1 and S2, the front surfaces of the respective speakers 23 and 25 are through the first and second sound emission ports 19 and 20, and the rear surface of the second speaker is the bass reflex duct. It is configured to be in direct contact with the atmosphere outside the gaming machine 10 via the 27 and the third sound emission port 21, respectively. Therefore, the reproduced sound can be reproduced and output from each of the speakers 23 and 25 with higher sound quality without being collected.

(5) Further, the speakers 23 and 25 are attached to the front surfaces of the speakers 23 and 25 having the diaphragms and edges.
Since the protective covers 24 and 26 made of a synthetic fiber material that allow the passage of the sound emitted from the speakers are covered, the front portions of the speakers 23 and 25 can be preferably protected without deteriorating the sound quality.

(6) In addition, each speaker unit 23,
Since the 25 are individually and independently arranged in the dedicated enclosures E1 and E2, a conflict with a sound reproduced and output from another speaker unit arranged in another enclosure can be avoided. , Speaker units 23, 25 arranged in the respective enclosures E1, E2
It is possible to reproduce with a high quality as a transparent sound without cluttering the reproduced sound of.

(7) Further, in the first speaker device S1 configured as a closed type speaker, the first enclosure E1 has a closed structure, and the first enclosure E1 has a wide width and a shallow depth when viewed from the front. And
Therefore, in the first enclosure E1, air pressure is applied to the speaker 23 from the back side, and it is possible to reproduce and output middle and high tones with good sound quality, and also to reproduce and output low-pitched, crisp bass with a small volume. be able to.

(8) On the other hand, in the second speaker device S2 configured as a bass reflex type speaker, the bass reflex duct 27 connected to the third sound emission port 21 is formed inside the second enclosure E2. Therefore, the speaker 25 is provided in the bass reflex duct 27 and the second enclosure E2.
It is possible to resonate the sound emitted from the back side of the speaker to supplement the sense of volume in the low-pitched sound range, enabling powerful low-pitched sound reproduction, while making the speaker device S2 itself very compact.

(9) In addition, since the bass reflex duct 27 has a labyrinthine duct structure that is extended and bent, the bass reflex duct 27 has a long total length even in the gaming machine 10 where the machine base size is restricted. it can. Therefore, in the bass reflex type speaker, the low-frequency reproduction band capable of enhancing the low-frequency sound can be further extended to the low-frequency band, and more powerful so-called heavy bass can be produced.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIGS. In addition, this second
The embodiment is different from the first embodiment only in the specific configuration of the second enclosure E2 in the second speaker device S2, and the other configurations are the same as those in the first embodiment. Therefore, in the following description, the difference from the first embodiment will be mainly described, and the other parts will be denoted by the same reference numerals as those in the first embodiment, and redundant description will be omitted.

Now, in the gaming machine 10 according to the present embodiment, as shown in FIG.
First speaker device S1 configured as a closed speaker
And a second speaker device S2 configured as a bass reflex speaker. Each speaker device S1, S2
Are speaker enclosures of the enclosures E1 and E2 formed by the partition wall 22 on the back side of the upper dish cover member 32, and the first and second speakers, which are speaker units for medium and high frequencies, are provided in the respective enclosures E1 and E2. 23 and 25 are arranged. Although not shown in FIG. 6, the first sound emission port 19 and the second sound emission port 20 are formed in the upper bowl cover member 32 at positions corresponding to the front surfaces of the speakers 23 and 25. There is.

In the second enclosure E2 of the second speaker device S2, on the rear surface side of the upper bowl plate cover member 32, a cylindrical shape is formed from a location where the length of the upper bowl dish cover member 32 in the left-right direction is divided into two substantially equal parts. A bass reflex duct 27 that forms Although not shown, a third sound emission port 21 functioning as a bass reflex port is formed at a position corresponding to the bass reflex duct 27 in the upper bowl cover member 32. Further, the capacity of the second enclosure E2 is designed to be an appropriate capacity for low-pitched sound reproduction. Then, the second speaker device S configured in this way
When the sound output from No. 2 is measured, it becomes a graph of the reproduced sound pressure frequency characteristic f as shown in FIG. 7, and the low frequency reproduction band extends to about 170 Hz. Therefore, in this embodiment, the same effects as the respective effects (1) to (8) in the first embodiment are exhibited.

(Third Embodiment) Next, a third embodiment of the present invention will be described with reference to FIGS. In addition, this third
The description of the embodiment will be focused on the parts different from those of the above-described first embodiment, and the other parts will be denoted by the same reference numerals as those of the first embodiment, and redundant description will be omitted.

Now, in the gaming machine 10 according to this embodiment, as shown in FIG.
A speaker device S configured as a bass reflex type speaker is provided. In this speaker device S, an enclosure E formed by a partition wall 22 on the back side of the upper dish cover member 32 is used as a speaker accommodating portion, and the first speaker unit 23 and the second speaker unit 2 are provided in the enclosure E.
And 5 are provided. The first speaker unit 23 is the first speaker unit 23 in the first and second embodiments.
It is the same cone type speaker unit for mid-high range.

The second speaker unit 25 is a cone-shaped speaker unit having a horizontally long front surface, and a speaker unit for middle and low frequencies having a reproduction band lower than that of the first speaker unit 23 is used. Such a horizontally-long speaker unit can be arranged because the upper bowl plate 15 is harder to be restricted in space than the lower portion on the front surface side of the middle frame 12.
This is due to the use of the hollow interior of. In the enclosure E, the second speaker unit 25
Is arranged in the center, while the first speaker unit 2
3 is arranged on the right side when viewed from the front. And
Although not shown, the first sound emitting port 19 is formed at a position corresponding to the front surface of the first speaker unit 23 in the upper dish cover member 32, and a position corresponding to the front surface of the second speaker unit 25. The second sound emission port 20 is formed in the. The front surfaces of the first and second speaker units 23 and 25 are covered with protective covers 24 and 26 made of synthetic fiber material.

Further, in the present embodiment, in the enclosure E, on the back surface side of the upper dish cover member 32,
From near the left and right ends of the upper dish cover member 32,
The left and right cylindrical bass reflex ducts 27 are provided along the inner surface of the partition wall 22. The bass reflex ducts 27 are formed so that their inner ends face each other. Although not shown, third sound emission ports 21 functioning as bass reflex ports are formed at positions corresponding to the bass reflex ducts 27 in the upper dish cover member 32. Further, the capacity of the enclosure E is designed to be an appropriate capacity for low-pitched sound reproduction. Then, the speaker device S configured in this way
When the sound output from is measured, it becomes a graph of the reproduced sound pressure frequency characteristic f as shown in FIG. 9, and the low frequency reproduction band is 1
It extends to about 70 Hz.

Therefore, the present embodiment has the following effects in addition to the effects (1) to (5) in the first embodiment. (1) By using the second speaker unit 25 as a speaker unit for middle and low tones, the speaker device S can be constructed as a multi-way type speaker system capable of high-quality reproduction output from the low to middle to high tones. .

(2) Further, since the bass reflex duct 27 connected to the third sound emission port 21 is formed inside the enclosure E, the bass reflex duct 27 and the enclosure E come out from the rear surfaces of the speakers 23 and 25. The sound can be resonated to supplement the volume in the bass range, and powerful bass can be reproduced.

The above embodiments may be embodied by changing to other examples as follows. -In each of the above-mentioned embodiments, each speaker unit 23, 2
Although the front surface of 5 is covered with the protective covers 24 and 26, such covers 24 and 26 are not always necessary.

In each of the above-described embodiments, the first and second sound emission ports 19 and 20 formed in the upper dish cover member 32 are composed of a large number of small holes, but the first and second speaker units 23 are The sound emission ports 19 and 20 are not limited to small holes as long as the front surfaces of the sound emission ports 25 and 25 can directly contact the atmosphere. The same applies to the formation mode of the third sound emission port 21 that functions as a bass reflex port.

In the first embodiment, the bass reflex duct 27 formed in the second enclosure E2 is formed so as to have a labyrinthine duct structure that is extended and bent, but the duct structure is as shown in FIG. The bass reflex duct 27 of the so-called back load horn type may be formed. That is, a horn-shaped duct structure may be used in which the width of the bass reflex duct 27 increases as it approaches the third sound emission port 21 (not shown in FIG. 10) which is a bass reflex port. By configuring the bass reflex duct 27 in this way, it is possible to improve the efficiency in the bass range and reproduce and output a so-called crisp sound.

In the first and second embodiments, the same mid-high range speaker units 23 and 25 are arranged in the enclosures E1 and E2, respectively.
You may make it arrange | position different speakers with a different range to 1 and E2. For example, as shown in FIGS. 11 and 12, the first enclosure E having a hermetically sealed enclosure structure is used.
It is also possible to dispose the first speaker 23 of the high-pitched speaker unit in 1 and the second speaker 25 of the mid-tone speaker unit in the second enclosure E2 of the bass reflex type enclosure structure. In that case,
The first enclosure E1 is an enclosure dedicated to high frequencies, and the second enclosure E2 is an enclosure dedicated to medium frequencies. By doing so, it is possible to maintain high quality of each of the reproduced sounds of the high and middle tones. in this case,
The first speaker 23 and the second speaker 25 constitute a speaker unit for mid-high range.

In the first and second embodiments, the two partition walls 22 form the two enclosures E1 and E2 in the upper bowl 15; however, the upper wall dish is not provided with the partition wall 22. A plurality of loudspeakers (first and second loudspeakers 2
3, 25) may be accommodated. Further, also in the third embodiment, the partition wall 22 may be removed. In this case, the entire inside of the upper bowl 15 corresponds to the speaker accommodating portion. In addition, a plurality of three or more enclosures may be formed in the upper bowl 15 and the speaker units may be arranged in the respective enclosures. Further, the number of speaker units arranged in one enclosure is not limited to one.

In the first and second embodiments, the speaker unit 2 for middle and high frequencies is provided in each of the enclosures E1 and E2.
Although 3 and 25 are provided, a speaker unit for low sound may be provided in addition to them.

In the third embodiment, the multi-way type speaker system is configured by the combination of the first speaker 23 for middle and high frequencies and the second speaker 25 for middle and low frequencies, but as shown in FIG. A low-way speaker 41, a middle-tone speaker 42, and a high-tone speaker 43 may be arranged in the enclosure E to form a multi-way type speaker system. Note that, in FIG. 13, the front surface of each speaker 41 to 43 has a protective cover 44 to
Although covered with 46, the covers 44 to 46 are not necessarily required. Further, in this case, the speaker 42 for the middle tone
A speaker unit for medium and high frequencies is configured with the speaker 43 for high frequencies.

In each of the above-described embodiments, the speaker units 23 and 25 arranged in the first and second enclosures E1, E2 and E are cone-shaped speaker units, but they are flat plate-shaped planar units. A speaker unit may be used. Since the planar speaker unit does not require an installation space as compared with the cone speaker unit, the speaker devices S1, S2, S can be made compact.

Next, the technical ideas that can be understood from the above-described embodiment and the respective examples will be described below. (1) The gaming machine speaker system according to any one of claims 1 to 5, wherein at least the middle- and high-pitched speaker units are flat speaker units each having a flat plate shape. Speaker system.

[0061]

As described in detail above, according to the present invention,
It is possible to improve the sound quality of the speaker device included in the gaming machine without hindering maintenance work on the back side of the gaming machine.

[Brief description of drawings]

FIG. 1 is a front view of a pachinko gaming machine equipped with a speaker system.

FIG. 2 is a plan view showing an upper bowl.

FIG. 3 is a schematic plan sectional view of the speaker system of the first embodiment.

FIG. 4 is a graph showing reproduced sound pressure frequency characteristics of the speaker system.

FIG. 5 is a graph showing a reproduced sound pressure frequency characteristic of a comparative example corresponding to the related art.

FIG. 6 is a schematic plan sectional view of a speaker system according to a second embodiment.

FIG. 7 is a graph showing reproduced sound pressure frequency characteristics of the speaker system.

FIG. 8 is a schematic plan sectional view of a speaker system according to a third embodiment.

FIG. 9 is a graph showing reproduced sound pressure frequency characteristics of the speaker system.

FIG. 10 is a schematic plan sectional view of a speaker system of another example of the first embodiment.

FIG. 11 is a schematic plan cross-sectional view of a speaker system of another example of the first embodiment.

FIG. 12 is a schematic plan sectional view of a speaker system according to another example of the second embodiment.

FIG. 13 is a schematic plan sectional view of a speaker system according to another example of the third embodiment.

[Explanation of symbols]

10 ... Gaming machine, 15 ... Upper bowl, 21 ... 3rd sound emission port (bass reflex port), 23 ... 1st speaker unit (mid-high range speaker unit), 27 ... Bass reflex duct, E1,
E2 ... First and second enclosures (speaker housing).

Claims (5)

[Claims] 1. An inside of an upper bowl which is bulged so as to form a hollow inside on the front side of a machine body in a gaming machine is a speaker accommodating portion, and at least a speaker unit for middle and high frequencies is provided in the speaker accommodating portion. A speaker system for gaming machines installed with the front of the unit facing the machine front side. 2. The speaker system for gaming machine according to claim 1, wherein the speaker housing portion has an enclosure structure in which at least a speaker unit for middle and high frequencies is included in the speaker housing portion. 3. The speaker accommodating portion has a bass reflex type enclosure structure in which a bass reflex port is formed in the front surface of the upper bowl and a bass reflex duct communicating with the port is provided in the speaker accommodating portion. The speaker system for gaming machine according to claim 2. 4. The speaker system for gaming machine according to claim 3, wherein the bass reflex duct has a labyrinthine duct structure that is extended and bent in the speaker housing portion. 5. The speaker system for gaming machine according to claim 4, wherein the bass reflex duct has a horn-shaped duct structure in which a width of the bass reflex duct increases as the width approaches the bass reflex port.