JPH0728791Y2 - Board speaker mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a mounting structure for a board speaker.

(Prior art) As a speaker that is connected to an audio device and produces sound, a sound current is received and converted into mechanical vibration, and this vibration is transmitted to the cone paper, and the sound is generated by vibrating the cone paper. It is generally of a structure to generate. A speaker with this structure requires a baffle plate to eliminate (or reduce) the effects of air vibrations with a phase difference that occur on the front and back sides of the cone paper, or an enclosure that replaces the baffle plate is required. Becomes Therefore, since the speaker device is considerably large, it takes a large area in the room to install the speaker device. From this, there is a board speaker (wall speaker) that has been developed for the purpose of more easily producing sound.

Briefly explaining this board speaker, it has a structure in which cone paper is removed from a general speaker, and by attaching this structure to an appropriate board such as a wall plate or ceiling plate of a building, The board is used as a vibrating body. According to this structure, since the board sounds as a vibrating body and at the same time the function of the baffle plate is fulfilled, it is possible to easily enjoy music and the like with good sound quality.

(Problems to be solved by the invention) As described above, the board speaker has very excellent characteristics depending on the application, but its mounting structure is also important in order to fully fulfill its function. That is, the most general mounting structure is to project a plurality of projecting pieces on the outer periphery of the case, insert bolts into the projecting pieces, and mount them on the board with these bolts. Since the vibration generated by the board speaker will be transmitted to the board through this mounting part,
In addition to the vibration transmission efficiency reaching its limit, a strong case that does not cause resonance etc. is required for the case independently, and since it is fixed to the board at multiple points, the vibration does not uniformly distort the board. It is necessary to give consideration to such information.

As a solution to this problem, there is a device disclosed in Japanese Utility Model Publication No. 52-21050. In the present invention, a hole is formed through the center of the board speaker, and a bolt is inserted into this hole to support the board speaker on the board. According to this structure, the vibrating portion can be closely attached to the board with the bolt,
It is perfect in terms of vibration transmission efficiency, and since it can be fixed to the board in only one place, mounting work will be easier,
Since the case does not have to be particularly conscious of strength,
Although it will be possible to provide a lightweight and inexpensive board speaker as a whole, if there is a desire, there is a point where only one point can be improved. When the board speaker is made large to some extent, it is supported by only one bolt, so when this board speaker is mounted on a board such as a vertically erected wall, it is tilted from its own weight.
It means that it is difficult to maintain the correct posture parallel to the board surface. That is, even if the correct posture is taken at the time of the first setting, this may change due to vibration during use.

The present invention has been made in view of this point, and provides a mounting structure for a board speaker, which maintains good vibration transmission performance to the board and does not change posture even after long-term use. The purpose is.

(Means for Solving the Problems) As a means for solving the above problems, the present invention provides an annular yoke having a magnetic gap inside a cylindrical case, and the yoke is provided via a damper. Attached to a tubular member inserted through the yoke, the coil is positioned in the space of the yoke and the coil is fixed to the tubular member, and the tubular member has a screw hole for a bolt to be mounted on a vertical board, It is characterized in that a supporting spring for attaching to a vertical board is provided at an end of the cylindrical case.

(Operation) When the board speaker configured as described above is mounted on the vertical board via the bolt, the support spring is mounted on the upper or lower vertical board. When an audio current is applied to the coil installed in this way, vibration is generated between the yoke held by the damper and the vertical board on the coil side into which the bolt is screwed. Since the yoke is held symmetrically in the vertical plane, the load of the yoke is biased on the damper, but the spring property of the support spring holds the case in a state in which the yoke is stably suspended. It prevents the yoke from tilting with respect to the bolt axis. In this structure, the vibration transmitted from the support spring to the vertical board is absorbed, and the vibration is transmitted via the bolt.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a board speaker, and 2 is a vertical board (wall) on which the board speaker 1 is mounted. In the present invention, it is attached with two bolts 3 and 4. This will be described later. The board speaker 1 includes a magnet 5 as a magnetic pole, yokes 6 and 7 that sandwich the magnet 5, and a yoke.
It is roughly formed by a coil (voice coil) 8 located in a magnetic gap formed between 6 and 7, and a coil 8 supported by a yoke via a damper 9. The yoke 6 has a cylindrical shape with large and small diameters and has a T-shaped cross section. The yoke 7 is an annular plate having a hole in the center through which the small diameter portion of the yoke 6 can be inserted.

10 is a cylindrical case, and a hollow body 11 and a cap are provided in the center.
The above-mentioned coil 8 is attached to the cap 12 together with the damper 9 by inserting a cylindrical member consisting of 12 and. Further, the yoke 6 and 7 and the magnet 5 are housed inside the case 10. Reference numerals 13 and 14 are sponges, and 15 is an electric wire for supplying a voice current to the coil 8. The bolt 3 passes through the hollow body 11 and the cap 12 located at the center of the case 10, and the tip is screwed into the board 2. As a result, the board speaker 1 is supported by the board 2.

As shown in FIG. 2 and FIG. 3, a part (upper part) of the case 10 has an arc shape as a whole, and the center part thereof has a protruding piece.
Suspension springs (supporting springs) 17 formed by 16 are attached at both ends. Then, the above-mentioned bolt 4 is inserted into the projecting piece 16 of the suspension spring 17, and the tip is screwed into the board 2. As a result, the bolt 4 supports the board speaker 1 via the suspension spring 17.

Next, the operation will be described. When a voice current is supplied from an audio device (not shown) through the electric wire 15, the coil 8 generates a magnetic field according to the direction and strength of this current. This magnetic field causes mutual interference with the magnetic field generated by the magnet 5, and as a result, the coil 8
As seen from the above, the damper 9 and the yokes 6 and 7 are vibrated. This vibration is transmitted to the board 2 via the bolt 3 and the cap 12 and vibrates the board 2. This vibration causes the board 2 to sound. Vibration is bolt 3 and cap 12
Since it is directly transmitted from the vibration source to the board 2 via the, the transmission efficiency can be extremely increased, and therefore a sufficient volume can be obtained even with a small electric power. Again 10
Since the upper part of is elastically supported via the suspension spring 17,
It is not affected by vibration and can maintain a correct posture even after long-term use.

(Effect of the Invention) Since the present invention has a board speaker mounting structure which is constructed and operates as described in the abnormality, it is possible to improve the vibration transmission efficiency as compared with the case where the speaker is mounted on the outer peripheral portion of the case. In addition to being possible, it is possible to use a thin and lightweight case. Further, since the support spring (suspension spring) absorbs the vibration and additionally supports it, the vibration transmission by the bolt is ensured, and the mounting state is maintained for a long time, so that the speaker performance is also maintained. It will be.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention taken along the line I--I of FIG. 2, FIG. 2 is a rear view of FIG. 1, and FIG. 3 is a view of FIG. 2 seen from above. It is a top view. 1 …… Board speaker, 2 …… Board 3,4 …… Bolt, 5 …… Magnet 6,7 …… Yoke, 8 …… Coil 9 …… Damper, 10 …… Case 11 …… Hollow body, 12 …… Cap 16 …… Protrusion, 17 …… Suspension spring

Claims (1)

[Scope of utility model registration request] 1. An annular yoke provided with a magnetic pole and having a magnetic gap formed therein is provided inside a cylindrical case, and the yoke is attached to a cylindrical member inserted through the yoke via a damper, in the gap of the yoke. And fixing the coil to the tubular member, the tubular member having a screw hole for a bolt to be attached to a vertical board, and providing a supporting spring attached to the vertical board at an end of the tubular case. Board speaker mounting structure characterized by