JPH099388A - Speaker - Google Patents

Abstract

PURPOSE: To improve the reliability by fitting a roll edge with a tilt with respect to a frame and making a tilt angle equal to a tilt angle of a diaphragm so as to block rolling of an inverted cone speaker. CONSTITUTION: A diaphragm 11 is supported to a rigid frame 12 via a roll edge 13 so that its circumferential part is located backward (to listener) with respect to the middle part. Then the roll edge 13 is adhered to the diaphragm 11 and the frame 12 by an adhesives or the like so that the tilt angle from the middle part of the diaphragm 11 extended toward the circumferential part is equal to the tilt angle of the roll edge 13. When a current is supplied from a voice output amplifier circuit to a voice coil 25, a bobbin 26 is vibrated and the vibration is delivered to the diaphragm 11, from which a sound wave is generated. In this case, even when the center point of the roll edge 13 and the rolling is not deviated in the forward/backward direction, since the roll edge 13 itself is tilted, a repulsive force blocking the rolling is caused. The rolling is blocked by the repulsive force.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker used in audio equipment, and more particularly, to a speaker having an improved diaphragm mounting structure so that the rolling operation of the diaphragm can be prevented.

[0002]

2. Description of the Related Art A speaker is a cone type speaker in which a diaphragm (cone) is opened forward with respect to a magnetic circuit which is a source of vibration, and an inverted cone is opened backward so as to cover the magnetic circuit. There is a type speaker, and the inverted cone type speaker has an advantage that it can be formed thin. 5A and 5B are views showing a structure of a conventional inverted cone speaker, FIG. 5A is a sectional view, and FIG. 5B is an enlarged view showing a roll edge portion. Hereinafter, description will be given with reference to the drawings.

Reference numeral 71 denotes a conical diaphragm for converting the vibration from the bobbin 86 into a sound wave. The diaphragm 71 has a rigid body so that the peripheral portion is located rearward (to the listener) with respect to the central portion of the diaphragm 71. It is supported by the frame 72 via roll edges 73. It should be noted that what is horizontal to the roll edge 73 described later is shown in FIG.
As shown in (b), it means the direction toward the speaker center axis within the plane 73b provided on the semi-cylindrical portion 73a, and the term "vertical" means the height direction of the semi-cylindrical portion 73a which is orthogonal to the direction. A magnetic field is formed between the center pole 83a (which is integrated with the back plate 83) and the top plate 81 (referred to as a gap) by the top plate 81, the back plate 83, and the magnet 82. 84 is bobbin 8
6 is a damper that supports the eccentricity. 85 is wound around a cylindrical bobbin 86, and the center pole 83a
A voice coil arranged between the top plate 81 and the top plate 81 vibrates the bobbin 86 back and forth (corresponding to the top and bottom in FIG. 5) by the current supplied to the voice coil 85 (output current of the voice amplifier circuit). The bobbin 86 transmits the vibration to the vibrating plate 71, and the vibrating plate 71 vibrates back and forth (corresponding to the upper and lower sides in FIG. 5) to generate sound waves.

[0004]

In the conventional inverted cone type speaker, as shown in FIG. 6 (a), a diaphragm 71 is used.
The vibration causes the diaphragm 71 and the bobbin 86 connected to the diaphragm 71 to roll around the damper 84 (point a2) as a fulcrum as shown by the dotted line. As a result, the voice coil 85 is eccentric in the narrow gap between the center pole 83 a and the top plate 81, and the voice coil 85 is moved to the top plate 8.
Vibration plate 71 due to contact with 1 and disconnection, or rolling
There is a problem that distortion is generated due to the irregular vibration of and the sound quality is deteriorated.

Originally, the roll edge 73 of the speaker is not easily deformed by the force of the diaphragm 71 in the front-rear direction (the direction perpendicular to the roll edge 73) so as not to interfere with the vibration of the diaphragm 71, and The eccentricity is prevented by repelling the force in the circumferential direction (horizontal direction with respect to the roll edge 73). In the cone type speaker shown in FIG. 6B, the rolling force F30 applied to the roll edge (point b3) is decomposed into a component F31 perpendicular to the roll edge and a horizontal component F32. The roll edge (point b3) and the center point of rolling (point a3) are not on a straight line and are displaced forward and backward, so the repulsive force F33 that tries to prevent rolling is F33.
(The size is almost the same as F32 but the direction is opposite). On the other hand, in the inverted cone type speaker shown in FIG. 6A, the rolling force F20 applied to the roll edge (point b2) is also decomposed into a component F21 perpendicular to the roll edge and a horizontal component. However, since the roll edge (point b2) and the center point of rolling (point a2) are substantially aligned with each other and are not shifted back and forth, only a small repulsive force is generated to prevent rolling. Therefore, the conventional inverted cone type speaker cannot prevent rolling.

The present invention solves such a problem, and an object of the present invention is to provide a speaker having high reliability by preventing rolling of an inverted cone type speaker.

[0007]

In order to solve the above-mentioned problems, according to the present invention, the peripheral portion of the diaphragm is provided with a roll edge of an elastic body so that the peripheral portion of the diaphragm is located rearward of the central portion. In a reverse cone type speaker supported by a rigid frame, the inclination angle of the cone from the central portion of the diaphragm toward the peripheral portion and the inclination angle of the roll edge attached to the frame are equal, The diaphragm is attached to the frame via the roll edge.

Further, the present invention is characterized in that it has a second cone which is open to the front in the center of the diaphragm and is fixed to the diaphragm, and which is connected to the vibrating section which vibrates in response to the input of an electric signal. It is a thing. Also, in the inverted cone type speaker in which the peripheral portion of the diaphragm is supported by the rigid frame via the corrugated edge of the elastic body so that the peripheral portion of the diaphragm is located rearward of the center portion, The diaphragm is attached to the frame via the corrugated edge so that the inclination angle of the cone from the central portion to the peripheral portion is equal to the inclination angle of the corrugated edge attached to the frame. It is characterized by.

[0009]

In FIG. 2, the roll edge is attached so as to be inclined with respect to the frame, and the inclination angle is the same as that of the diaphragm. The rolling force F10 applied to the roll edge (b1 point) is the roll edge (b1 point)
Is decomposed into a vertical component F11 and a horizontal component F12. Even if the roll edge (point b1) and the center point of rolling (point a1) are not shifted back and forth, the roll edge itself is inclined, so the repulsive force F13 (F12 and the magnitude that tries to prevent rolling) is Almost the same but opposite direction) occurs.
This repulsive force F13 can prevent rolling.

[0010]

1A and 1B are views showing the structure of an inverted cone type speaker according to a first embodiment of the present invention. FIG. 1A is a sectional view and FIG. 1B is an enlarged view showing a roll edge portion. FIG. 2 shows the first of the present invention.
FIG. 6 is a diagram for explaining the repulsive force of the roll edge that prevents rolling of the inverted cone speaker of the embodiment. Hereinafter, description will be given with reference to the drawings.

Reference numeral 11 denotes a conical diaphragm for converting the vibration from the bobbin 26 into a sound wave. The diaphragm 11 has a rigid body so that its peripheral portion is located rearward (to the listener) with respect to the central portion. It is supported by the frame 12 via roll edges 13. At this time, as shown in FIG. 1B, the roll edge 13 is arranged so that the inclination angle extending from the central portion of the vibration plate 11 to the peripheral portion is equal to the inclination angle of the roll edge 13.
1 and the frame 12 are fixed with an adhesive or the like (in this state when no signal is input to the voice coil). In addition, horizontal to the roll edge 13 described later means a radial direction connecting both flat surfaces 13b and 13c provided at both ends of the semi-cylindrical portion 13a, and vertical means a direction orthogonal to the radial direction and a height direction of the semi-cylindrical portion 13a. Say. Top plate 21,
A magnetic field is formed between the center pole 23a (which is integrated with the back plate 23) and the top plate 21 (gap) by the back plate 23 and the magnet 22.
A voice coil 25 wound around the bobbin 26 is arranged in the gap. Reference numeral 24 is a damper that supports the bobbin 26 so as not to be eccentric.

Next, the operation will be described. The bobbin 26 vibrates back and forth (corresponding to the top and bottom in FIG. 1) due to the current supplied from the voice output amplifier circuit (not shown) to the voice coil 25 and the magnetic field between the center pole 23a and the top plate 21 (gap). To do. The vibration of the bobbin 26 is transmitted to the diaphragm 11, and the diaphragm 11 vibrates back and forth (corresponding to the upper and lower sides in FIG. 1) to vibrate the air and generate sound waves.

At this time, since it is supported so that the inclination angle extending from the central portion of the diaphragm 11 to the peripheral portion and the inclination angle of the roll edge 13 are equal to each other, it is added to the roll edge (point b1) as shown in FIG. The rolling force F10 is decomposed into a component F11 perpendicular to the roll edge (point b1) and a component F12 horizontal. Even if the roll edge (b1 point) and the rolling center point (a1 point) do not shift back and forth, the roll edge itself is inclined, so the repulsive force F13 (F12 and the magnitude that tries to prevent rolling is almost the same). Same but opposite direction) occurs. This repulsive force F13 can prevent rolling.

As described above, in the inverted cone type speaker of this embodiment, the roll edge supporting the diaphragm is inclined so that horizontal repulsive force is generated at the roll edge to prevent rolling. it can. FIG. 3 is a cross-sectional view showing the structure of an inverted cone type speaker having a cone at the center according to the second embodiment of the present invention. Hereinafter, description will be given with reference to the drawings.

Reference numeral 31 denotes a conical diaphragm which converts the vibration from the bobbin 46 into a sound wave. The central portion of the diaphragm 31 is a cone 31a which is open toward the front, and the peripheral portion of the cone 31a with respect to the central portion. A roll edge 33 is provided on the rigid frame 32 so that the peripheral portion is located rearward (to the listener).
Is supported through. A magnetic field is formed between the center pole 41 and the yoke 43 (gap) by the yoke 43 and the magnet 42, and a voice coil 45 wound around the bobbin 46 is arranged in the gap. Reference numeral 48 is a dust cap for dust prevention. The cone 31a in the center
Are provided to improve the frequency characteristics and directivity of sound.

Next, the operation will be described. The current supplied to the voice coil 45, the center pole 41, and the yoke 43
The magnetic field in the gap (gap) causes the bobbin 46 to move forward and backward (see FIG.
It corresponds to up and down). The vibration of the bobbin 46 is transmitted to the diaphragm 31 (31a), and the diaphragm 31 vibrates back and forth (corresponding to the upper and lower sides in FIG. 3) to vibrate the air and generate sound waves. At this time, since it is supported so that the inclination angle extending from the central portion of the vibration plate 31 to the peripheral portion and the inclination angle of the roll edge 33 are equal to each other, as in the case of the first embodiment, the moment for preventing the rolling is provided. Occurs.

As described above, in the inverted cone speaker of the present embodiment, the roll edge supporting the diaphragm is inclined so that a horizontal repulsive force is generated at the roll edge to prevent rolling. it can. FIG. 4 is a sectional view showing the structure of the inverted cone type speaker of the third embodiment of the present invention. Hereinafter, description will be given with reference to the drawings.

Reference numeral 51 denotes a conical diaphragm for converting the vibration from the bobbin 26 into a sound wave. The diaphragm 51 has a rigid body so that the peripheral portion is located rearward (to the listener) with respect to the central portion of the diaphragm 51. The frame 52 is supported by corrugated edges 53. The other names, functions, and actions are the same as those in the first embodiment, so the same reference numerals are given and description thereof is omitted. The bobbin 26 vibrates back and forth (corresponding to the top and bottom in FIG. 4) by the current supplied to the voice coil 25. The vibration of the bobbin 26 is transmitted to the diaphragm 51, and the diaphragm 51 vibrates back and forth to vibrate the air and generate sound waves. At this time, the diaphragm 51 is supported so that the inclination angle extending from the central portion to the peripheral portion and the inclination angle of the corrugated edge 53 are equal to each other. Therefore, as in the case of the first embodiment, the repulsion for preventing the rolling is provided. Power is generated.

As described above, in the inverted cone type speaker of this embodiment, the corrugated edge supporting the diaphragm is inclined so that horizontal repulsive force is generated at the roll edge to prevent rolling. it can.

[0020]

As described in detail above, according to the present invention, rolling can be prevented in the inverted cone type speaker,
It is possible to provide a speaker having high reliability and high sound quality, which is free from disconnection of the voice coil.

[Brief description of drawings]

1A and 1B are views showing a structure of an inverted cone type speaker according to a first embodiment of the present invention, FIG. 1A is a sectional view, and FIG. 1B is an enlarged view showing a roll edge portion.

FIG. 2 is a diagram illustrating a repulsive force of a roll edge that prevents rolling of the inverted cone speaker according to the first embodiment of the present invention.

FIG. 3 is a sectional view showing the structure of an inverted cone speaker according to a second embodiment of the present invention.

FIG. 4 is a sectional view showing the structure of an inverted cone speaker according to a third embodiment of the present invention.

FIG. 5 is a diagram showing a structure of a conventional inverted cone speaker,
(A) is sectional drawing, (b) is an enlarged view which shows a roll edge part.

6A and 6B are views for explaining the repulsive force of a roll edge that prevents rolling of the speaker, wherein FIG. 6A is an inverted cone speaker and FIG. 6B is a cone speaker.

[Explanation of symbols]

11, 31 ... Vibration plate 21 ...
Top plate 12, 32 ... Frame 24, 44
... Damper 13, 33 ... Roll edge 25, 45
... Voice coil 22,42 ... Magnet 26,46
... Bobbin 23a, 41 ... Center pole 43 ...
yoke

Claims (3)

[Claims] 1. An inverted cone speaker in which a peripheral portion of the diaphragm is supported by a rigid frame via a roll edge of an elastic body so that the peripheral portion of the diaphragm is located rearward of a central portion of the speaker. The diaphragm is attached to the frame through the roll edge such that the inclination angle of the cone from the center of the diaphragm toward the periphery and the inclination angle of the roll edge attached to the frame are equal. A speaker characterized by the following. 2. A second cone, which is open to the front in the center of the diaphragm, is fixed to the diaphragm, and is connected to the vibrating section that vibrates when an electric signal is input. The speaker according to claim 1. 3. An inverted cone speaker in which a peripheral portion of the diaphragm is supported by a rigid frame via a corrugated edge of an elastic body so that the peripheral portion of the diaphragm is located rearward of a center portion of the speaker. The diaphragm is attached to the frame via the corrugated edge so that the inclination angle of the cone from the central portion of the diaphragm toward the peripheral portion is equal to the inclination angle of the corrugated edge attached to the frame. A speaker characterized by the following.