JP2002218588A - Heat radiation structure for inner core speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat radiation structure for an inner core speaker where heat can easily be radiated from a magnetic circuit and no dust enters the magnetic gap. SOLUTION: In the inner core speaker where magnetic circuits 2, 3, 4 are contained inside a frame 1, a hole 1a leading to the magnetic circuits 2, 3, 4 is provided on the frame 1 and a passage where the hole 1a is led to a magnetic gap is shut by an additional member 12 placed between the frame 1 and the magnetic circuit member 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal magnet type loudspeaker in which a magnetic circuit is housed inside a frame, and more particularly to a heat dissipation structure of the magnetic circuit.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional example of an internal magnet type speaker in which a magnetic circuit is housed inside a frame. Yoke 2, plate 3, magnet 4 and top plate 5 shown in the figure
Are made of a magnetic material or a magnet, and are fixed to each other to form a magnetic circuit.

The magnetic circuit is housed in a resin frame 15 and fastened to the frame 15 with screws 6. The voice coil bobbin 7 is supported by a frame 15 via a damper 9, and a voice coil 8 wound around the voice coil bobbin 7 is disposed in a magnetic gap between the yoke 2 and the plate 3.

The diaphragm 10 bonded to the voice coil bobbin 7 is supported on a frame 15 via an edge 11.
The current flowing through the voice coil 8 disposed in the magnetic gap causes the diaphragm 10 to vibrate by electromagnetic action to emit sound.

[0005]

In the above-described conventional inner-magnet type speaker, since the magnetic circuit is housed in the frame, the speaker does not touch the outside air and the heat generated in the voice coil 8 is not released to the outside. There is a problem that the temperature of the magnetic circuit becomes high due to the inside of the magnetic circuit.

If a hole is formed in the frame so that heat is easily released from the magnetic circuit, dust may enter the magnetic gap through the hole, causing a problem that the performance as a speaker is impaired.

[0007] The present invention has been made in view of the above points, and an object of the present invention is to provide an inner-magnet-type speaker that easily releases heat from a magnetic circuit and does not cause dust to enter a magnetic gap. It is to provide a heat dissipation structure.

[0008]

According to the present invention, there is provided a heat radiation structure for an internal magnet type speaker in which a magnetic circuit is housed inside a frame, wherein the frame is provided with a hole communicating with the magnetic circuit. Is a structure in which the passage leading to the magnetic gap is shielded by an additional member disposed between the frame and the magnetic circuit member.

Further, according to the heat dissipation structure of the internal magnet type speaker of the present invention, in the internal magnet type speaker in which the magnetic circuit is housed inside the frame, a hole is provided in the frame to communicate with the magnetic circuit, and the hole is formed in the magnetic gap. The communication path is shielded by a telescoping additional member disposed between the damper and the magnetic circuit member.

Further, according to the heat dissipation structure of the internal magnetic type speaker of the present invention, in the internal magnetic type speaker in which the magnetic circuit is housed inside the frame, the frame is provided with a hole communicating with the magnetic circuit, and the hole is formed in the magnetic gap. The passage leading therethrough is shielded by a damper attached to the magnetic circuit member.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An inner magnet type speaker according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing an internal magnet type speaker according to a first embodiment of the present invention. The yoke 2, plate 3, magnet 4 and top plate 5 shown in the figure are made of a magnetic material or a magnet, and are fixed to each other to form a magnetic circuit.

The magnetic circuit is housed in a resin frame 1 and fastened to the frame 1 by screws 6. The voice coil bobbin 7 is connected to the frame 15 via the damper 9.
The voice coil 8 wound around the voice coil bobbin 7 is disposed in a magnetic gap between the yoke 2 and the plate 3.

The diaphragm 10 bonded to the voice coil bobbin 7 is supported on a frame 15 via an edge 11.
The current flowing through the voice coil 8 disposed in the magnetic gap causes the diaphragm 10 to vibrate by electromagnetic action to emit sound.

In this example, the frame 1 is provided with a hole 1a, and the air passing through the hole 1a cools the yoke 2 of the magnetic circuit. The passage leading from the hole 1a to the magnetic gap is provided by an additional member 12 disposed between the frame 1 and the yoke 2.
To prevent dust from entering the magnetic gap.

FIG. 2 is a sectional view showing an internal magnet type speaker according to a second embodiment of the present invention. 2, members having the same functions as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In this example, a hole 1a is provided in the frame 1, and the air passing through the hole 1a cools the yoke 2 of the magnetic circuit. The passage extending from the hole 1a to the magnetic gap is closed by an elastic additional member 13 disposed between the damper 9 and the yoke 2, thereby preventing dust from entering the magnetic gap. In this example, the air in the frame 1 communicating with the hole 1a is vibrated by the damper 9 and the elastic additional member 13 to accelerate the flow and enhance the cooling effect.

FIG. 3 is a sectional view showing an internal magnet type speaker according to a third embodiment of the present invention. 2, members having the same functions as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted. In this example, the voice coil bobbin 7
Is supported by the yoke 2.

Then, as in the first embodiment, the frame 1
Is provided with a hole 1a, and the air passing through the hole 1a cools the yoke 2 of the magnetic circuit. The passage leading from the hole 1a to the magnetic gap is closed by a damper 14 interposed between the voice coil bobbin 7 and the yoke 2, thereby preventing dust from entering the magnetic gap. In this example, the air in the frame 1 communicating with the hole 1a is vibrated by the damper 14 to accelerate the flow and enhance the cooling effect.

Although the embodiment is constructed as described above, the invention is not limited to this. For example, the additional member 12 in the first embodiment may be formed integrally with the frame, and a ventilation member such as cloth may be used. It may be formed of a conductive member. In this case, air flows into the magnetic gap to further improve the cooling performance.

[0020]

According to the heat radiation structure of the internal magnet type speaker of the present invention, the heat radiation effect is enhanced because the magnetic circuit comes into contact with the outside air. If a material having a high thermal conductivity is used as an additional member disposed between the frame and the magnetic circuit member, the magnetic circuit is also cooled by this additional member, and the heat radiation effect is further enhanced.

Further, the one in which the passage through which the hole of the frame communicates with the magnetic gap is shielded by a telescopic additional member disposed between the damper and the magnetic circuit member, and the one in which the passage is shielded by the damper attached to the magnetic circuit member, The air in the frame is vibrated by the damper to accelerate the flow and the cooling effect is further enhanced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an internal magnet type speaker according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing an internal magnet type speaker according to a second embodiment of the present invention.

FIG. 3 is a sectional view showing an internal magnet type speaker according to a third embodiment of the present invention.

FIG. 4 is a cross-sectional view showing an example of a conventional internal magnet type speaker.

[Explanation of symbols]

 Reference Signs List 1 frame, 1a hole 2 yoke 3 plate 4 magnet 5 top flat 6 screw 7 voice coil bobbin 8 voice coil 9 damper 10 diaphragm 11 edge 12 additional member 13 elastic additional member 14 damper 15 frame

Claims (3)

[Claims] 1. An internal magnet type speaker in which a magnetic circuit is housed inside a frame, wherein a hole is provided in the frame to communicate with the magnetic circuit, and a passage through which the hole communicates with the magnetic gap is provided between the frame and the magnetic circuit member. A heat radiation structure for an internal magnet type speaker, wherein the heat radiation structure is shielded by an additional member disposed in the speaker. 2. An internal magnet type speaker in which a magnetic circuit is housed inside a frame, wherein the frame has a hole communicating with the magnetic circuit, and the hole has a passage communicating with the magnetic gap between the damper and the magnetic circuit member. A heat dissipation structure for an internal magnet type speaker, wherein the heat dissipation structure is shielded by an additional telescopic member. 3. An internal magnet type speaker in which a magnetic circuit is housed inside a frame, wherein the frame has a hole communicating with the magnetic circuit, and the hole communicates with a magnetic gap by a damper attached to a magnetic circuit member. Heat dissipation structure of inner magnet type speaker characterized by being shielded.