JP2003235094A - Speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker capable of relaxing unnecessary strength of the speaker for a medium and high frequency band while maintaining proper rigidity for a medium and low frequency band so as to reduce sound quality deterioration in the medium and high frequency bands caused by excessive strength by a strength reinforcing part of rib shape. <P>SOLUTION: The speaker includes: a frame 12; a diaphragm 14 supported by the frame 12; a permanent magnet 33; a voice coil 28 wound on a coil bobbin 26 causing an attractive/repulsive force by an electromagnetic force caused between the permanent magnet and the voice coil receiving power conduction so as to deliver vibration to the diaphragm 14 thereby vibrating air, the rib shaped strength reinforcing part 50 to prevent unnecessary vibration caused by production of bending of the diaphragm 14 attendant on the vibration of the diaphragm 14 is provided to the outer circumferential part of the diaphragm 14 and a rigidity relax part 70 to relax the rigidity of the rib shaped strength reinforcing part 50 is provided to the rib shaped strength reinforcing part 50. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker for reproducing sound based on an electric signal.

[0002]

2. Description of the Related Art A cone type speaker has a conical diaphragm, and an outermost peripheral portion of the diaphragm is fixed to a frame so that the diaphragm can vibrate. In the outermost peripheral portion of this diaphragm, a rib-shaped strength reinforcing portion may be provided over the entire circumference. The rib-shaped strength reinforcing portion is provided to prevent unnecessary vibration caused by the bending of the diaphragm of the speaker due to the amplitude of the diaphragm.

[0003]

However, if the outer peripheral portion of the diaphragm is reinforced by providing such a rib-shaped strength-reinforcing portion, in both the middle frequency band and the low frequency band of the sound. Is effective in preventing unnecessary vibration, but in each frequency band of the middle and high frequencies of the sound, the outer periphery of the diaphragm is reinforced due to the rigidity reinforced by the rib-shaped strength reinforcement part. When the part becomes rigid, peaks, dips, or distortions occur in the mid-high frequency band of the sound, which causes deterioration of the sound quality in the mid-high band. Therefore, the present invention solves the above-mentioned problems, and alleviates unnecessary strength generated in the frequency band of the middle-high frequency band while maintaining appropriate rigidity in the frequency band of the middle-low frequency band, and by the rib-shaped strength reinforcing portion. It is an object of the present invention to provide a speaker capable of reducing deterioration of sound quality in a middle-high frequency band caused by excessive strength.

[0004]

According to a first aspect of the present invention, there is provided a speaker which reproduces sound based on an electric signal, the frame, a diaphragm held by the frame, a permanent magnet,
And a voice coil wound around a coil bobbin for transmitting vibration to the diaphragm to vibrate the air by generating an attractive repulsive force by an electromagnetic force generated between the permanent magnet and the vibration. The outer peripheral portion of the plate is provided with a rib-shaped strength-reinforcing portion that prevents unnecessary vibration caused by the bending of the diaphragm as the diaphragm vibrates. Has
The speaker is characterized in that a rigidity reducing portion is provided to reduce the rigidity of the rib-shaped strength reinforcing portion.

In the first aspect, the diaphragm is held by the frame. The voice coil is wound around a coil bobbin, and when this voice coil is energized, an electromagnetic force generated between the voice coil and the permanent magnet causes an attractive repulsive force,
Vibration is transmitted to the diaphragm to vibrate the air and reproduce sound.
The rib-shaped strength-reinforcing portion is provided on the outer peripheral portion of the diaphragm, and prevents unnecessary vibration caused by the bending of the diaphragm as the diaphragm vibrates. The rigidity relaxing portion is provided in the rib-shaped strength reinforcing portion, and the rigidity relaxing portion relaxes the rigidity of the rib-shaped strength reinforcing portion. As a result, unnecessary strength that occurs in the mid-high frequency band due to the rib-shaped strength reinforcing portion is
It moderates the sound while maintaining an appropriate rigidity in the mid-low frequency band. As a result, it is possible to reduce the deterioration of the sound quality in the mid-high frequency band of the sound caused by the excessive strength due to the existence of the rib-shaped strength reinforcing portion.

According to a second aspect of the present invention, in the loudspeaker according to the first aspect, the rigidity relaxation section is composed of a plurality of slits formed at intervals along the rib-shaped strength reinforcing portion. . In claim 2, the rigidity reducing portion is
A plurality of slits are formed at intervals along the rib-shaped strength reinforcing portion.

According to a third aspect of the present invention, in the loudspeaker according to the first aspect, the rigidity relaxing portion is thicker than the thickness of the diaphragm at the rib-shaped strength reinforcing portion, and the inside is made of the material of the diaphragm. It is formed so as to be sparse compared to. In the third aspect, the rigidity reducing portion is formed so that the width is thicker than the thickness of the diaphragm and the inside is sparser than the material of the diaphragm.

According to a fourth aspect of the present invention, in the loudspeaker according to the first aspect, the rigidity relieving portion is configured by disposing a vibration damping material in the rib-shaped strength reinforcing portion. In the fourth aspect, the rigidity relaxing portion is configured by disposing the vibration damping material in the rib-shaped strength reinforcing portion.

According to a fifth aspect of the present invention, in the loudspeaker according to the first aspect, the rigidity relaxing portion is formed by forming a recess in the rib-shaped strength reinforcing portion. In the fifth aspect, the rigidity reducing portion is formed by forming a recess in the rib-shaped strength reinforcing portion.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiment described below is a preferred specific example of the present invention,
Although various technically preferable limitations are given, the scope of the present invention is not limited to these forms unless otherwise specified in the description below.

FIG. 1 is a perspective view with a partial cross section showing a preferred embodiment of the speaker of the present invention, and FIG.
FIG. 2 is an axial cross-sectional view of the speaker shown in FIG. 1. Speaker 10
Is a so-called cone type dynamic speaker, and has a frame 12, a cone type diaphragm 14, a plate 20, a yoke 22, a magnet 33, a coil bobbin 26, a center pole 30, and a voice coil 28. The magnet 33 is a ring-shaped permanent magnet. Frame 1
2 has a terminal member 24, and this terminal member 24 electrically connects the speaker drive circuit 100 and the voice coil 28. Based on the electric signal supplied from the speaker drive circuit 100, the voice coil 28 is operated by the magnet 3
3 is magnetically attracted or repelled to thereby vibrate the diaphragm 14 so that the diaphragm 14 vibrates air to reproduce sound.

The diaphragm 14 has a dust cap 18 in the center thereof. The dust cap 18 is located at a position corresponding to the center pole 30. The vibrating plate 14 is a conical vibrating portion made of paper, for example, cone paper, and the rib 50 is formed on the outermost peripheral portion of the vibrating plate 14 over the entire circumference.
Are formed. The rib 50 is a rib-shaped strength reinforcing portion. As shown in FIG. 2, the cross section of the edge 51 is, for example, semicircular. One outer edge of the edge 51 is fixed to the outer peripheral portion 12A of the frame 12. The other inner edge of the edge 51 is fixed to the rib 50 along the entire circumference. The diaphragm 14 is a portion that vibrates air in the E direction.

The damper 16 is a portion that supports the coil bobbin 26 so that it can move easily. The voice coil 28 is wound around the outer peripheral surface of the cylindrical coil bobbin 26 by a predetermined number of turns.
A center pole 30 is located inside the coil bobbin 26. The plate 20, the yoke 22, and the magnet 33 form a magnetic circuit. This magnetic circuit gives the voice coil 28 a magnetic flux for vibration. The plate 20, the yoke 22, and the center pole 30 are made of iron. The plate 20 is a ring-shaped plate having a hole 20A. The yoke 22 is a disc, and a center pole 30 is integrally formed in the center of the yoke 22 so as to project.

As shown in FIGS. 1 and 2, the rib 50 of the diaphragm 14 is provided with a plurality of slits 70 at predetermined intervals. The slits 70 are radially formed, for example, along the radial direction of the diaphragm 14. The slit 70 corresponds to a rigidity relaxing portion for relaxing the rigidity of the rib 50, which is a rib-shaped strength reinforcing portion. The diaphragm 14 of the speaker 10 shown in FIGS. 1 and 2 has a so-called conical shape, but is shown in FIG. 4 against the diaphragm edge 50 of the board-shaped diaphragm 14 as shown in FIG. Thus, it has a plurality of slits 70.

By forming the slit 70 in this way, the following merits are obtained. That is, by having the rib 50 that is a rib-shaped strength-reinforcing portion, it is possible to reduce unnecessary strength generated in the middle-high frequency band while maintaining proper rigidity in the middle-low frequency band. Have As a result, it is possible to reduce the deterioration of the sound quality in the frequency band of the middle and high frequency bands, which is caused by the excessive strength due to the rib 50.

FIG. 5 shows another embodiment of the diaphragm 14 in the speaker of the present invention. A rigidity relaxation portion 170 is formed on the outermost peripheral portion of the diaphragm 14. The rigidity relaxation portion 170 is formed so that the width of the diaphragm edge 50, which is a rib-shaped strength reinforcing portion, is thicker than the thickness of the diaphragm 14, and the inside thereof is sparser than the material of the diaphragm 14. ing. A plurality of the rigidity relaxing portions 170 are formed in a part of the diaphragm edge 50 at predetermined intervals.

FIG. 6 shows still another embodiment of the diaphragm 14 in the embodiment of the present invention. In FIG. 6, a plurality of damping materials 270 are formed at predetermined intervals with respect to the diaphragm edge 50 of the diaphragm 14. The plurality of vibration damping materials 270 form a rigidity relaxation section.
The damping material 270 is a plastic material such as paper or tape or a rubber material, and is attached with an adhesive.

FIG. 7 shows still another embodiment of the diaphragm of the present invention. Inside the rib 50 formed on the outermost peripheral portion of the diaphragm 14, a recess 370 is formed over the entire circumference. The concave portion 370 constitutes a rigidity relaxation portion.

FIG. 8 shows an example of a basic form of a speaker according to still another embodiment of the present invention. The shape of diaphragm 114 of the speaker shown in FIG. 8 is a so-called track type, unlike the shape of diaphragm 14 in the embodiment of FIG. The rib 50 formed on the outermost peripheral portion of the diaphragm 14 can be provided with a rigidity relaxing portion as shown in FIGS. 9 to 12. In the embodiment shown in FIG. 9, the diaphragm 114 of the track type is used.
A plurality of slits 70 are formed on the rib 50 of FIG. The plurality of slits 70 form a rigidity relaxation section.

FIG. 10 shows still another embodiment of the diaphragm 114 having a track shape, and the rib 50 of the diaphragm 114 is provided with a rigidity relaxation portion 170 similar to that shown in FIG.

FIG. 11 shows still another embodiment of the track-shaped diaphragm 114. A plurality of damping materials 270 are formed on the ribs 50 provided on the outermost peripheral portion of the diaphragm 114. The vibration damping material 270 constitutes a rigidity relaxation section in the same manner as in FIG.

FIG. 12 shows still another embodiment of the diaphragm 114 having a track shape. Inside the rib 50 formed on the outermost peripheral portion of the diaphragm 114, a recess 370 is formed over the entire circumference, as in FIG. 7. This recess 37
0 constitutes a rigidity relaxation section.

13 to 17 show an example of the basic form of a pyramidal diaphragm. A diaphragm edge 50 is formed on the outermost peripheral portion of the diaphragm 214 shown in FIG. As shown in FIG. 14, a plurality of slits 70 are formed in each rib 50 of the diaphragm 214. This slit 7
Reference numeral 0 is a stiffness relaxation section.

Rigidity reducing portions 170 are formed on the ribs 50 of the diaphragm 214 of the embodiment shown in FIG. The rigidity reducing portion 170 is a rigidity reducing portion similar to that shown in FIG.

The ribs 5 on both sides of the diaphragm 214 shown in FIG.
At 0, a plurality of damping materials 270 are arranged respectively. Similar to FIG. 11, these damping materials 270 form a rigidity relaxation section.

Ribs 5 are provided on both sides of the diaphragm 214 of FIG.
0 are provided, and inside the ribs 50, recesses 370 are formed on the back side along the longitudinal direction thereof. These recesses 370 form a rigidity relaxation section.

In the embodiment shown in FIG. 4, the slit 70
Are formed along the radial direction of the diaphragm 14.

In each of the vibrating plates 14, 114 and 214 shown in FIGS. 5, 10 and 15, the rigidity relaxation portion 170 is provided.
The rigidity relaxation portion 170 is formed such that the width is thicker than the thickness of the material of the diaphragm and the density becomes sparse during the papermaking, so that the rigidity relaxation portion 170 in the middle and low frequency bands is formed. It is possible to maintain an appropriate rigidity against vibration and to provide rigidity loss in the frequency band in the middle and high frequency bands. In the embodiments shown in FIGS. 5, 10, and 15, it is also effective to impregnate the portion that is sparse with respect to the rigidity relaxation portion 170 with the damping material.

In the embodiment shown in FIGS. 6, 11 and 16,
The damping material 270 is preferably attached to the surfaces of the diaphragms 14, 114, 214 with an adhesive.

As described above, in the loudspeaker of the present invention, when the outer peripheral portion or the outer peripheral portion of the diaphragm has the rib-shaped strength reinforcing portion, the strength of the strength reinforcing portion is relaxed with respect to the strength reinforcing portion. By providing a section,
To reduce the occurrence of peaks, dips, and distortions in the mid-to-high frequency band caused by reflections in the mid-to-high frequency band, and to reduce sound quality deterioration in the mid-to-high frequency band. You can Moreover, it is possible to maintain the effect of making the outer peripheral portion of the diaphragm rigid by the rib-shaped strength-reinforcing portion in the low and middle frequency band.

The present invention is not limited to the above embodiment. The shape of the speaker diaphragm is not limited to the conical shape, the track shape, or the pyramid shape described above, and may be an elliptical shape or a square shape when viewed from the front.

[0032]

As described above, according to the present invention,
Unnecessary intensity that occurs in the mid-high frequency band,
It is possible to reduce the sound quality deterioration in the mid-high frequency band caused by the excessive strength due to the rib-shaped strength reinforcing portion while maintaining appropriate rigidity in the mid-low frequency band while maintaining appropriate rigidity.

[Brief description of drawings]

FIG. 1 is a perspective view with a partial cross section showing a preferred embodiment of a speaker of the present invention.

2 is an axial cross-sectional view of the speaker shown in FIG.

FIG. 3 is a diagram showing a substrate form example of a conical diaphragm of the speaker in the embodiment of the invention.

FIG. 4 is a diagram showing an example in which slits, which are rigidity relaxation portions, are formed on the ribs of the diaphragm of FIG.

FIG. 5 is a view showing an example in which another rigidity relaxation section is formed on the rib of FIG.

6 is a diagram showing an example in which a damping material is attached to the ribs of FIG.

FIG. 7 is a diagram showing an example in which a concave portion is formed as a rigidity reducing portion on the rib of FIG.

FIG. 8 is a view showing an example of a substrate type in which a diaphragm of a speaker is a track type.

9 is a diagram showing an example in which slits are formed on the ribs of the diaphragm of FIG.

FIG. 10 is a view showing an example in which another rigidity relaxing portion is formed on the rib of FIG.

11 is a view showing an example in which a vibration damping material is attached to the rib of FIG.

FIG. 12 is a view showing an example in which a concave portion is formed as a rigidity reducing portion on the rib of FIG.

FIG. 13 is a diagram showing a substrate form example of a pyramidal diaphragm of a speaker.

14 is a diagram showing an example in which slits are formed on the ribs of the diaphragm of FIG.

FIG. 15 is a view showing an example in which another rigidity relaxing portion is formed on the rib of FIG.

FIG. 16 is a view showing an example in which a vibration damping material as a rigidity reducing portion is attached to the rib of FIG.

FIG. 17 is a view showing an example in which a concave portion which is a rigidity reducing portion is formed on the rib of FIG.

[Explanation of symbols]

10 ... Speaker, 12 ... Frame, 14 ...
Vibration plate, 20 ... Plate, 22 ... Yoke, 26
... Coil bobbins, 28 ... Voice coils, 33 ...
..Magnets (permanent magnets), 50 ... Ribs (strength-enhancing portions of the rib shape), 51 ... Edges, 70 ... Slits (stiffening portions), 114, 214 ... Vibration plates,
170 ... Stiffness reducing portion, 270 ... Damping material (stiffness reducing portion), 370 ... Recessed portion (stiffness reducing portion)

Claims (5)

[Claims] 1. A speaker that reproduces sound based on an electric signal, the electromagnetic force generated between a frame, a diaphragm held by the frame, a permanent magnet, and the permanent magnet when energized. A voice coil wound around a coil bobbin for transmitting vibration to the vibration plate by virtue of generating a suction repulsive force to vibrate the air, and the vibration plate vibrates on the outer peripheral portion of the vibration plate. A rib-shaped strength-reinforcing portion for preventing unnecessary vibration caused by the occurrence of bending of the diaphragm is provided, and the rib-shaped strength-reinforcing portion relaxes the rigidity of the rib-shaped strength-reinforcing portion. A speaker provided with a rigidity relaxation portion for the speaker. 2. The loudspeaker according to claim 1, wherein the rigidity reducing portion is composed of a plurality of slits formed at intervals along the rib-shaped strength reinforcing portion. 3. The rigidity relaxation portion is formed so that the width of the rib-shaped strength reinforcing portion is thicker than the thickness of the diaphragm and the inside thereof is sparser than the material of the diaphragm. The speaker according to 1. 4. The speaker according to claim 1, wherein the rigidity reducing portion is configured by disposing a vibration damping material in the rib-shaped strength reinforcing portion. 5. The speaker according to claim 1, wherein the rigidity reducing portion is formed by forming a recess in the rib-shaped strength reinforcing portion.