JP2000308744A - Attaching structure of cone-shaped speaker unit for game machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an attaching structure of a cone-shaped speaker unit for a game machine capable of making a low-pitched sound clearly audible and producing a high quality sound. SOLUTION: A cone-shaped speaker unit 53 is mounted on a shooting rail base board 42, which is mounted on an attaching wall 41. In this condition, a bass reflex type enclosure with only a second through hole 49 as the opening is formed behind the speaker unit 53. Accordingly, sounds in the negative phase will not come around to the front of the speaker unit 53, and low-pitched sympathetic sounds can be produced from the second through hole 49.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure of a cone type speaker unit of a game machine having a built-in cone type speaker unit for a game machine for generating a sound effect according to the content of the game in order to enhance the interest. is there.

[0002]

2. Description of the Related Art As a kind of gaming machine, for example, in a pachinko machine, a sound effect such as music or synthesized voice according to the game content is emitted from a cone type speaker unit for the gaming machine in order to enhance the interest in the game. A general cone type speaker unit for a game machine (hereinafter simply referred to as a speaker unit) is built in a front frame, for example, in a front frame of a pachinko machine so that a player can hear sound well. The sound can be heard through the sound passage of the upper tray mounted on the front of the front frame. However, since the purpose of a pachinko machine is to hit a game ball to obtain a lot of prize balls, the sound quality is considered to be secondary, based on the idea that the sound effect should be merely sounded. Further, the front frame on which the speaker unit is mounted does not have much space. From these facts, in the past, the speaker unit was merely attached to the mounting plate with care not to interfere with other members, and no special measures were taken to stick to particular sound quality. The fact that the speaker unit is simply attached to the mounting plate means that the conventional speaker unit is in the form of a flat baffle enclosure in which the front and back of the cone 101 are spatially continuous as shown in FIG. An enclosure generally refers to a box in which a speaker unit is mounted.

[0003]

By the way, a high sound as a property of a sound wave has a sharp directivity, so that the sound goes straight ahead of the cone 101. On the other hand, the bass is diffused in all directions of the cone 101 because the directivity is low. That is, in the plane baffle, a phenomenon occurs in which low sounds emitted from the back side of the cone 101 wrap around from the outside of the mounting plate to the front side. FIG.
As shown in (1), the sound waves emitted from the cone 101 have a plus / minus relationship on the front and back sides, and the sound on the back side (positive phase) and the sound on the back side (opposite phase) are combined to cancel each other. Therefore, in the enclosure of the plane baffle, the low-pitched sound is felt unsatisfactory because the low-pitched sound is canceled by the wraparound of the opposite-phase sound. The present invention
It is made by paying attention to such problems existing in the conventional technology. An object of the present invention is to provide a mounting structure of a cone type speaker unit for a gaming machine, which can clearly hear bass and has good sound quality.

[0004]

In order to achieve the above object, according to the first aspect of the present invention, a cone type speaker unit is built in, and a sound effect emitted from the front surface of the cone is guided to a sound generation port through an acoustic passage. In the mounting structure of the speaker unit of the gaming machine, the speaker unit is mounted on the front wall, the space between the front wall and the rear wall is surrounded by the intermediate wall, and the space is partitioned from the outside. The gist of the invention is to block the opposite-phase sound waves generated rearward from the speaker unit. With this configuration,
The low-phase bass sound that appears on the back side of the cone of the cone-type speaker unit cannot go around to the front wall side and does not cancel the low-phase bass sound.

According to a second aspect of the present invention, there is provided an installation structure for a speaker unit of a gaming machine, wherein the speaker unit has a built-in cone-type speaker unit and guides sound effects emitted from the front surface of the cone to a sound generation port through an acoustic passage. The speaker unit is mounted on the front wall, the space between the front wall and the rear wall is surrounded by an intermediate wall, and the space is partitioned from the outside. The gist is that sound waves resonate in the same space and exit from an opening formed at a position different from the speaker unit. With this configuration, the low-frequency bass output from the back side of the cone of the cone-type speaker unit cannot go around to the front wall, does not cancel the low-frequency bass, and resonates in space. While being guided, he leaves from another position. Therefore, a resonance sound that is further enhanced is added to the positive phase sound.

[0006]

According to the first aspect of the present invention, the bass is not canceled out, the bass is clearly heard, and the sound quality of the sound effect is improved, so that the interest of the game is increased. According to the second aspect of the invention, the low tone is not canceled out, and the low tone is clearly heard. In addition, the low tone is enhanced and resonated, so that the sound quality is further improved and the interest of the game is increased.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a pachinko machine will be described below with reference to the drawings. First, the outline of the structure of the pachinko machine will be described. In the following description, the front side or the front side refers to the side facing the player, and the back side or the back side refers to the opposite side. The left and right refer to the left and right directions as viewed from the player side. As shown in FIG. 1, the pachinko machine has an outer frame 1 and a front frame 2. The outer frame 1 is made of wooden upper and lower and left and right frame plates 1a to 1
d forms a frame shape. A curtain plate 3 on which the front frame 2 is placed is formed on the lower frame plate 1b. The front frame 2 is attached to the outer frame 1 as a supporting frame. The front frame 2 is cantilevered by hinge fittings 4a, 4b formed at upper and lower positions of a left frame plate 1d of the outer frame 1, and can be opened and closed with respect to the outer frame 1. As shown in FIG. 3, the front frame 2 is a plate made of a synthetic resin formed in a frame shape by upper and left and right frame plates 2a to 2c and a lower cover plate mounting plate 5. An opening 6 is formed in the center of the front frame 2. The lower side of the opening 6 is a firing rail mounting area 7. As shown in FIGS. 1 and 2, a decorative plate 9 is adhered to the upper and left and right frame plates 2 a to 2 c.

As shown in FIG. 4, a mechanism panel 8 is mounted on the front frame 2. The mechanism panel 8 is disposed behind the front frame 2 so as to be surrounded by the outer frame 1, and the back side is exposed by opening the front frame 2. Various mechanisms essential to the game, such as a ball tank 11, a gutter unit 12, a prize ball discharging device 13, a winning ball processing device 14, a control device 15, a game ball launching device 16, and a symbol display device unit 17 are provided on the back side of the mechanism board 8. Are arranged. At the position of the opening 6, a game board 10 is mounted. The game board 10 has a substantially circular game area P surrounded by guide rails 18 for guiding game balls. In the game area P, a windmill 19, a normal winning opening 20, a starting winning opening 21, a jackpot winning opening 22, a passing gate 23, a display device 24 and the like are arranged at predetermined positions. It should be noted that nails serving as obstacles for game balls driven into the game area P are not shown. The front surface of the game board 10 is covered by a glass door 26. The glass door 26 is a left frame plate 2b of the front frame 2.
A cantilever is supported by a hinge fitting (not shown) formed at a position corresponding to the vertical width of the glass door 26 and can be opened and closed with respect to the front frame 2.

An upper cover plate 28 is mounted below the game board 10. An upper cover plate 28 covers the firing rail mounting area 7. The upper cover plate 28 is cantilevered by a hinge (not shown) formed on the left frame plate 2 b of the front frame 2, and can be opened and closed with respect to the front frame 2. The upper cover plate 28 has an upper tray 29 protruding forward. As shown in FIGS. 2 and 8, a first acoustic passage 30 is formed on the left side inside the tray 29. The first sound passage 30 is communicated with a first sound generation port 31 opened on the front face of the tray 29 and is opened on the back plate 27. As shown in FIGS. 2 and 9, a second
Are formed. Second acoustic path 32
Denotes a second sound generating port 3 opened in the front of the tray 29
3 and open to the back plate 27. As a result, both sound generating ports 31, 33 face the player facing the pachinko machine. Upper cover plate 2
A prize ball discharge gutter 34 for guiding a prize ball is formed on the rear plate 27 of the rear plate 8 so as to project rearward. Upper cover plate 28
A lower cover plate 36 is fixed to the front surface of the lower cover plate mounting plate 5 below the lower side. The lower cover plate 36 has a lower tray 37 protruding forward.
An operation handle 38 is mounted on the right side of the lower receiving tray 37.

Next, the structure of the firing rail mounting area 7 will be described in detail. As shown in FIGS. 3 and 6, a mounting wall 41 as a rear wall is formed in the firing rail mounting area 7. The mounting wall 41 is provided upright at a position behind the shelf 40 formed in a step-like shape with respect to the lower cover plate mounting plate 5, and is a horizontally long wall-like body formed to have substantially the same width as the width of the opening 6. ing. An eaves portion 39 projecting forward is formed above the mounting wall 41. A prize ball discharge port 43 to which the prize ball discharge gutter 34 is connected is formed near the upper left of the mounting wall 41, and a game ball discharge port 44 is formed substantially at the center. Reinforcing ribs 45 are provided vertically and horizontally on the front of the mounting wall 41.
Are formed to protrude. Reinforcement projections 46 are formed at predetermined intervals near the upper and lower edges of the mounting wall 41 (only the lower edge is shown). As shown in FIG. 10, the reinforcement protrusion 46 is formed so that the amount of protrusion forward of the reinforcement rib 45 is larger. A firing rail base 42 is mounted on the front surface of the mounting wall 41. As shown in FIGS. 8 and 10, the firing rail base 42 is brought into contact with the reinforcing projection 46 in a mounted state, and is provided between the firing rail base 42, the mounting wall 41, the shelf 40, and the eaves panel 39. Forms a first space e1 surrounded by. At this time, since the reinforcing protrusion 46 projects more forward than the reinforcing rib 45, the first space e1 is not partitioned into small rooms by the reinforcing rib 45.

As shown in FIGS. 5 to 7, the firing rail base 42 has a horizontally long front wall 42a.
A firing rail 47 is mounted on the front of the camera. A large, substantially rectangular first through hole 48 is formed in the left half of the front wall 42a. A mounting frame plate 50 is formed on the front side of the firing rail base 42 and at the periphery of the first through hole 48. The mounting frame plate 50 includes a speaker unit mounting board 52.
Is installed. The speaker unit mounting base 52 includes a front wall 52a and an outer frame 52b, and a well-known speaker unit 53 is attached to a mounting hole 51 formed in the front wall 52a. The speaker unit 53 includes a center cap-integrated cone 54, an edge 55, a mounting frame 56, and the like. A voice coil, a magnet, a damper, and the like (not shown) are enclosed in the mounting frame 56. Outer frame 52b of speaker unit mounting board 52
Is fixed by screwing a bolt (not shown) to a bolt fixing body 59 which is in contact with the front end of the mounting frame plate 50 and formed at a predetermined position. As shown in FIG. 10, a second gap e2 surrounded by the front wall 52a, the outer frame 52b, and the mounting frame plate 50 of the mounting substrate 52 in a state where the speaker unit mounting substrate 52 is mounted on the mounting frame plate 50. Is formed. The cone 54 of the speaker unit 53 faces the first acoustic path 30 of the upper cover plate 28 in a state where the speaker unit mounting base 52 is mounted on the launch rail base 42.

A second through hole 49 as an opening is formed below the firing rail 47. As shown in FIGS. 7 and 9, a duct 57 is formed on the back side of the firing rail base 42 and at the periphery of the second through hole 49. The second through hole 49 faces the second acoustic passage 32 of the upper cover plate 28 in a state where the speaker unit mounting base 52 is mounted on the firing rail base 42. As shown in FIG. 7, an outer frame 42 b is formed on the rear surface side of the firing rail base 42 so as to protrude substantially along the outer shape of the firing rail base 42. A partition wall 62 is formed in the middle of the outer frame 42b so as to divide the outer frame 42b halfway. The partition wall portion 62 is arranged to spatially partition the game ball discharge port 44 from the space on the back surface of the firing rail base 42. A packing 63 made of synthetic rubber as a sealing member is attached to the outer frame 42 b, a part of the rear surface of the firing rail base 42 and the rear end surface of the partition wall 62. The packing 63 is interposed between the firing rail base 42 and the mounting wall 41 to seal a joint between the two. The mounting wall 41, the launch rail base 42, and the speaker unit mounting base 52 are fixed by screwing a bolt (not shown) to a bolt fixing body 59 formed at a predetermined position. As shown in FIG. 10, a space E in which the first and second gaps e1 and e2 are combined is formed between the launch rail base 42 and the mounting wall 41 in a state where the firing rail base 42 is mounted on the mounting wall 41. Is done. FIG. 11 shows a conceptual diagram in which FIG. 10 is omitted. This space E is a space partitioned from the outside where only the second through hole 49 is opened. That is, the speaker unit 53 of the present embodiment includes the launch rail base 42, the mounting wall 41, and the shelf 4
0, an enclosure En surrounded and partitioned by the eaves plate portion 39, the speaker unit mounting base 52, and the like is formed.

The enclosure En of the present embodiment is a bass reflex type enclosure in which a resonance sound (mainly a bass portion) using a reversed phase sound from the speaker unit 53 to the internal space E is emitted from the second through hole 49. It is said. That is, as shown in FIG. 11, a positive-phase sound is output from the cone 54 in front of the speaker unit 53, and a negative-phase sound is output in the rear space E side. Then, the low-tone portion of the opposite-phase sound, which has poor directivity, diffuses and resonates with the inside of the enclosure En and the duct 57, and the resonance sound is generated from the second through-hole 49. In the present embodiment, the front wall 42a of the firing rail base 42 and the front wall 52a of the speaker unit mounting base 52 correspond to the front wall, and each of the shelf 40 and the eaves 39 and the outer frame of the firing rail base 42. 4
2b, mounting frame plate 50 and speaker unit mounting base 52
The outer frame 52b corresponds to an intermediate wall, and the mounting wall 41 corresponds to a rear wall.

In the bass reflex type enclosure En, the bass reflex, that is, the opening area of the second through hole 49 and the length of the duct 57 must be appropriately designed. In addition, it is necessary to obtain the volume of the enclosure En as a premise of the bass reflex design. If these designs are not appropriate, the bass will not be reproduced sufficiently from the second through-hole 98. Specifically, in the design of the bass reflex enclosure En, the minimum resonance frequency (fo), the tuning frequency (fb), the effective mass of the vibration system (Mo), the equivalent Q
(Qo), stiffness (So, Sc), and effective vibration radius (a) need to be set. Here, fo is an element that changes depending on the frequency, and the lower this fo is, the more advantageous in bass reproduction. However, not only fo but also Mo and Qo are involved in bass reproduction. fb is fo corrected according to the value of Qo. Mo is the mass of the vibration system, and when Mo is large, it becomes a so-called woofer and bass sounds are easily produced. Qo is an element that determines the bass characteristics of the speaker unit 53. The smaller the Qo, the better the damping. The value of Qo is almost determined by the type of the enclosure En. So is an equivalent stiffness representing the hardness of the speaker unit 53, and Sc is an equivalent stiffness representing the hardness of the cabinet, that is, the launch rail base 42 and the mounting wall 41. The ratio between So and Sc is represented by α. Stiffness is the strength of the spring. a is a radius at which the cone 54 vibrates except for the edge 55, and is usually 2.4 to 23 cm.
Between. Here, the space E is defined as the internal volume V of the enclosure En, and is calculated as V = 355 × a ⁴ / α × fo ² × Mo. The opening area S of the first through hole 48 is calculated as S = (π × a ² ) × 0.2 to 1.0. The length L of the duct 57 is L = (30000 × S / fb ² × V) −0.825 × S
Calculated by ^1/2 . In the present embodiment, the internal volume V of the enclosure En, the opening area S of the first through hole 48, and the length L of the duct 57 are designed and configured based on the above equations.

Next, the operation of the speaker unit 53 in the pachinko machine configured as described above will be described. When an audio current is supplied from an amplifier device (not shown), the cone 54 of the speaker unit 53 is vibrated to generate sound. A positive phase sound (sound wave) is emitted from the front of the cone 54 toward the front, and the sound is emitted from the first sound generating port 31 through the first sound passage 30 of the upper cover plate 28 covering the front of the firing rail base 42. Fired toward the player. On the other hand, at the same time as the cone 54 vibrates, an opposite-phase sound (sound wave) is emitted toward the rear of the speaker unit 53. Particularly, the bass part of the opposite phase sound is diffused to the rear of the speaker unit 53, and the diffused resonance sound propagates through the space E and is emitted forward from the second through hole 49 while resonating in the duct 57. . Furthermore, the sound is the launch rail base 42
The sound is emitted from the second sound generation port 33 toward the player through the second sound passage 32 of the upper cover plate 28 covering the front surface. Out of phase sound is speaker unit 5
Since there is no gap around the front side of No. 3, there is no cancellation of the normal phase sound.

With this configuration, the present embodiment has the following effects. The player can listen to the sound whose bass is not erased from the first sound generation port 31, and
Mainly from the sound generation port 33 of the low frequency part. Therefore, a voluminous sound effect in which the bass portion is not erased can be heard, and a further enhanced sound effect of the bass portion is added from the second sound generation port 33 as in the conventional case. This makes it possible to produce not only a poor sound effect in the low-pitched portion but also a sound effect having a remarkably high sound quality. -In a pachinko machine with limited space, the enclosure En is made horizontally long to increase the volume, so that it is possible to provide an enclosure En that does not take up space in the front-rear direction and is not bulky. The upper cover plate 28 immediately before the firing rail base 42;
Are arranged, and the cone 54 of the speaker unit 53 is the first
The second through hole 49 faces the second acoustic passage 32. Therefore, the generated sound is directly transmitted to the first sound generation port 31 and the second sound generation port 3.
3, the generated sound is hardly attenuated.

The firing rail base 42 and the mounting wall 41 are brought into contact with each other with a packing 63 interposed therebetween, and the internal space E has a high airtightness. Therefore, there is no room for the opposite-phase sound to reach the front side of the speaker unit 53. The speaker unit 53 is a speaker unit mounting board 5
The speaker unit mounting base 52 is fixed to the firing rail base 42 with bolts. Therefore, even if a problem occurs in the speaker unit 53, the speaker unit mounting board 52
, And it is not necessary to remove the firing rail base 42, thereby improving work efficiency. Since the firing rail base 42 is in contact with the reinforcing protrusions 46 arranged in the up-down and lateral directions in the mounted state, the rigidity of the firing rail base 42 is improved, and the firing rail base 42 is less likely to be bent or distorted.

Incidentally, the present invention can be embodied with the following modifications. In the above-described embodiment, the duct 57 is provided to resonate the opposite-phase sound. However, the design of the above embodiment is the most common duct structure as a bass reflex type enclosure, and for example, a second duct 71 may be provided in the middle as shown in FIG. By doing so, it is possible to enhance the bass part.
In addition, when the duct is arranged in such a way, the sound on the normal phase side is strengthened depending on the design. In the above embodiment, the duct 57 is provided. However, as shown in FIG.
7 need not be provided. If the duct 57 is provided, it is possible to enhance the bass portion. However, even without such an effect, the opposite phase sound does not wrap around to the front side of the speaker unit 53 and cancel out the normal phase sound. This is because sound quality can be sufficiently improved as compared with the related art. In the above embodiment, the pachinko machine having one speaker unit 53 has been described as an example. However, the present invention can be applied to a model having two or more speaker units. In the present embodiment, the front wall, the intermediate wall, and the rear wall forming the enclosure En are constructed by combining a plurality of component parts due to space restrictions.
However, if there is room for space, instead of the enclosure En having such a complicated shape, for example, the enclosure En having a rectangular parallelepiped shape may be formed by simple front, intermediate, and rear walls.
Of course, it does not matter. The present invention can be applied not only to a pachinko machine but also to a gaming machine such as a slot machine, an arepachi, an arrangement ball, etc. as long as it has a speaker unit. In addition, the present invention can be freely implemented without departing from the gist of the present invention.

Other technical ideas of the present invention that can be grasped from the above embodiment will be described below. (1) The gaming machine is a ball-and-ball game machine, the ball-and-ball game machine has an outer frame and a front frame mounted with the outer frame as a supporting frame, and the cone-type speaker unit is located on the front frame side. 3. The mounting structure of a cone type speaker unit for a gaming machine according to claim 1, wherein the speaker unit is mounted on a cone type speaker unit. (2) A cover plate having a ball tray is detachably provided on the front surface of the front frame, and the front wall on which the speaker unit is mounted is disposed on the rear surface of the cover plate, and is provided through an acoustic passage in the cover plate. 2. A mounting structure for a cone type speaker unit for a game machine according to claim 1, wherein sound waves are emitted from a sound generation port formed on a front surface of the cover plate. (3) A cover plate having a ball tray is detachably provided on a front surface of the front frame, and a front wall on which the speaker unit is mounted is disposed on a back surface of the cover plate, and a first sound in the cover plate is provided. A first-phase sound wave is emitted from a first sound generation port formed on the front surface of the cover plate through the passage, and a second sound wave formed on the front surface of the cover plate through a second sound passage in the cover plate. 3. The sound generator according to claim 2, wherein a resonance sound due to the opposite phase sound wave is emitted from the sound generation port.
3. A mounting structure for a cone type speaker unit for a gaming machine according to claim 1. (4) A cover plate having a ball tray is detachably provided on the front surface of the front frame, and the speaker unit is mounted on a mounting wall of the cover plate, and the ball tray is mounted on the front frame. 4. The mounting wall according to claim 1, wherein the mounting wall is combined with the rear wall and the intermediate wall formed on the front frame to form a space partitioned from the outside. 5. Mounting structure of cone type speaker unit for gaming machines. (5) A cover plate having a ball tray is detachably provided on the front surface of the front frame, and the speaker unit is mounted on a mounting wall of the cover plate, and the ball tray is mounted on the front frame. The mounting wall forms a space separated from the outside in combination with the rear wall and the intermediate wall formed on the front frame, and transmits a reverse-phase sound wave generated rearward from the speaker unit to the intermediate wall or the rear wall. The mounting structure of a cone type speaker unit for a gaming machine according to any one of claims 1 to 4, wherein the duct structure is guided to a front wall from a wall to a side. (6) The mounting structure of a cone type speaker unit for a gaming machine according to any one of claims 1 and 2, wherein the front surface of the cone and the opening are arranged on the same plane.

[0020]

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating the appearance of a pachinko machine according to an embodiment of the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a perspective view of a front frame of the same pachinko machine.

FIG. 4 is a rear view of the same pachinko machine.

FIG. 5 is a partially enlarged perspective view of the same pachinko machine in which a firing rail base, a speaker unit mounting base, and a speaker unit are mounted in a firing rail mounting area.

FIG. 6 is an exploded perspective view when the launching rail base, the speaker unit mounting base, and the speaker unit are mounted in the firing rail mounting area of the same pachinko machine.

FIG. 7 is a rear perspective view of the speaker unit mounting base of the same pachinko machine.

FIG. 8 is a partial cross-sectional view of the same pachinko machine at a speaker unit position.

FIG. 9 is a partial cross-sectional view of the same pachinko machine at a second through-hole position.

FIG. 10 is a sectional view of the same pachinko machine taken along line AA in FIG. 7;

FIG. 11 is a schematic diagram illustrating a flow of a sound generated from a speaker unit.

FIG. 12 is a schematic diagram illustrating a flow of a sound generated from a speaker unit according to another embodiment.

FIG. 13 is a schematic diagram illustrating a flow of a sound generated from a speaker unit according to another embodiment.

FIG. 14 is a schematic diagram illustrating a flow of a sound generated from a conventional speaker unit.

[Explanation of symbols]

7: launching rail mounting area, 30: first acoustic passage, 3
DESCRIPTION OF SYMBOLS 1 ... 1st sound generation port, 32 ... 2nd sound path, 33 ...
Second sound generating port, 39... Eave part as intermediate wall, 40
... Shelves as intermediate walls, 41 ... Mounting walls as rear walls, 4
2a: Front wall as front wall, 42b: Outer frame as intermediate wall, 49: Second through hole as opening, 52a: Front wall as front wall, 52b: Outer frame as intermediate wall, 53 ... Speaker unit.

Claims (2)

[Claims] 1. A game machine having a built-in cone type speaker unit, wherein sound effects emitted from the front of the cone are guided through a sound path to a sound generation port, and the speaker unit is mounted on a front wall. In addition, the space between the front wall and the rear wall is surrounded by an intermediate wall, and the space is partitioned from the outside, so that opposite-phase sound waves generated rearward from the speaker unit are cut off. A cone type speaker unit mounting structure for gaming machines, characterized by the following features. 2. A game machine having a built-in cone type speaker unit, wherein sound effects emitted from the front surface of the cone are guided to a sound generating port through an acoustic path, and the speaker unit is mounted on a front wall. In addition, the space between the front wall and the rear wall is surrounded by an intermediate wall to partition the space from the outside, and the opposite-phase sound waves generated rearward from the speaker unit in the space. A cone type speaker unit mounting structure for a gaming machine, characterized in that the speaker unit resonates and exits from an opening formed at a position different from the speaker unit.