JP2005269064A - Speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker for use in various sound equipment wherein occurrence of a peak dip in high frequency threshold frequency region or deterioration of sound quality in the intermediate and high sound zone is suppressed. <P>SOLUTION: In the speaker having a voice coil 6 coupled with a vibrating plate 8, lower end part of a center cap 9 is coupled while butting against the vibrating plate 8. Phase shift between the vibrating plate 8 and the center cap 9 is suppressed at the time of driving the speaker and occurrence of a peak dip in high frequency threshold frequency region or deterioration of sound quality in the intermediate and high sound zone is suppressed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an improvement in the quality of speakers used in various audio equipment.

  A conventional speaker will be described with reference to FIGS.

  FIG. 3A is a cross-sectional view of a conventional speaker, and FIG. 3B is an enlarged view of a B portion for explaining a joined state of a voice coil, a diaphragm, and a center cap, which are the main parts. 4 is a cross-sectional view of another prior art for explaining a joined state of the voice coil and the diaphragm.

  According to the figure, reference numeral 11 denotes a magnetic circuit, which is configured by adhesively bonding a magnet 13 and a plate 12 to the center of the bottom surface of the yoke 14.

  Reference numeral 15 denotes a frame in which the magnetic circuit 11 is bonded and bonded to the bottom surface, and is formed by resin molding or press molding of a thin metal plate.

  A voice coil 16 is formed by winding a magnet wire below the voice coil bobbin to form a coil portion, and is fitted in the magnetic gap 11 a of the magnetic circuit 11.

  Reference numeral 17 denotes a damper, which supports the voice coil 16 so as to move up and down by adhesively bonding an inner periphery thereof to the voice coil 16 and adhesively connecting an outer periphery thereof to the frame 15.

  Reference numeral 18 denotes a diaphragm having an inner periphery adhesively bonded to the voice coil 16 and an outer periphery adhesively bonded to the frame 15 via an edge portion 18a.

  Reference numeral 19 denotes a center cap, which adhesively bonds the diaphragm 18, the voice coil 16 and the cylindrical lower end portion 19 a of the center cap 19 with an adhesive 20 so as to cover the upper end of the voice coil 16.

FIG. 4 is a cross-sectional view showing a joined state of a diaphragm, a voice coil, and a center cap, which are main parts of another conventional speaker. According to FIG. 4, 21 is a diaphragm, and 22 is a voice coil bobbin. A voice coil is formed by winding a coil downward to form a coil portion 23, and 24 is a center cap that is bonded and fixed to the inner peripheral side of the voice coil 22. For example, Patent Document 1 is known as prior art document information having such a configuration.
Japanese Utility Model Publication No. 58-28496 (full text)

  In the conventional speaker as described above, in the recent trend toward higher sound quality of audio equipment, in the high frequency range, the high frequency range depends on the phase when the speaker is driven between the center caps 19 and 24 and the diaphragms 18 and 21. Peaks and dips occur in the limit frequency region, and sound quality degradation in the mid-high range has been recognized.

  As a countermeasure against such a phenomenon, if the outer circumference of the center cap is enlarged and the center cap 19 and the diaphragm 18 are directly connected, the phase shift can be prevented. The cap and the voice coil are loosely fitted, and there is a problem that fixing at the optimum position becomes complicated.

  The present invention solves the above-described problems and provides a small speaker with excellent high sound quality.

  In order to solve the above problems, a speaker according to the present invention includes a magnetic circuit, a frame joined to the magnetic circuit, a voice coil inserted into a magnetic gap of the magnetic circuit, and an inner periphery coupled to the voice coil. And a damper having an outer periphery coupled to the frame, an inner periphery coupled to the voice coil, an outer periphery coupled to the frame, and a center cap coupled to the voice coil. In the speaker, the center cap has a cylindrical portion extending substantially perpendicularly to the outer periphery, and the cylindrical end portion is in contact with and coupled to the diaphragm. The cylindrical end of the cylindrical portion extending substantially vertically Since the part is brought into contact with the diaphragm and bonded and fixed with an adhesive or the like, it is less affected by the adhesive and suppresses the phase shift between the center cap and the diaphragm. In the high-band limit frequency range and makes it possible to provide the speaker with reduced sound quality degradation of the peak-dip generation and mid-high range.

  As described above, since the speaker of the present invention is coupled by bringing the center cap and the diaphragm into contact with each other, the phase shift between the two is suppressed during the driving of the speaker, and the occurrence of peak dip in the high frequency range and the middle The present invention makes it possible to provide an excellent speaker that suppresses deterioration in sound quality in the high sound range, and its industrial value is very large.

  Embodiments of the present invention will be described below with reference to FIGS. 1 (a) to 2 (b).

(Embodiment 1)
FIG. 1A is a side sectional view of an embodiment of the speaker of the present invention, and FIG. 1B is an enlarged view of a portion A of a joint portion of a voice coil, a diaphragm, and a center cap, which are main parts. In particular, the invention described in claim 1, claim 2 and claim 3 will be described.

  According to the figure, reference numeral 1 denotes a magnetic circuit, which is constructed by bonding and bonding a magnet 3 and a plate 2 to the center of the bottom surface of the yoke 4.

  Reference numeral 5 denotes a frame in which the magnetic circuit 1 is adhesively bonded to the bottom surface, which is formed by resin molding or metal thin plate press molding.

  Reference numeral 6 denotes a voice coil in which a magnet wire is wound under a voice coil bobbin to form a coil portion 6 a, which is fitted in the magnetic gap 1 a of the magnetic circuit 1.

  Reference numeral 7 denotes a damper, which supports the voice coil 6 so as to move up and down by adhesively bonding an inner periphery thereof to the voice coil 6 and adhesively connecting an outer periphery thereof to the frame 5.

  Reference numeral 8 denotes a diaphragm having an inner periphery adhesively bonded to the voice coil 6 and also bonded to the frame 5 via an edge portion 8a formed on the outer periphery.

  Reference numeral 9 denotes a center cap. The inner diameter of the cylindrical portion of the center cap 9 that extends substantially vertically is set to a size that fits with the outer diameter of the upper end of the voice coil 6, and the center cap 9 is centered during fitting. The height of the cylindrical portion is appropriately set to a size that is not pushed up when coupled to the diaphragm 8, and the diaphragm 8, the voice coil 6, and the center are covered with an adhesive 10 so as to cover the upper end of the voice coil 6. The cylindrical lower end 9a of the cap 9 is adhesively bonded.

  The cylindrical lower end portion 9a of the center cap 9 is bent outward at an angle, and the diaphragm 8, the center cap 9 and the voice coil 6 are bonded to each other by the adhesive 10 with the tip thereof being in contact with the diaphragm 8. Bonded and secured.

  As described above, in the above embodiment, the diaphragm 8 and the center cap 9 are not coupled with the adhesive 10 because they are coupled and fixed to the voice coil 6 with the center cap 9 in contact with the diaphragm 8. The phase shift between them is suppressed, and the occurrence of peak dip in the high frequency range and the deterioration of the sound quality in the middle and high range can be suppressed.

  In the above embodiment, the diaphragm 8, the center cap 9 and the voice coil 6 are integrally bonded and fixed. However, at least the cylindrical lower end 9 a of the center cap 9 and the diaphragm 8 are bonded and bonded together. Although the effects of the present embodiment can be obtained, the voice coil 6 can be adhesively bonded at the same time to improve the efficiency of speaker assembly workability.

  In the above embodiment, the cylindrical lower end 9a of the center cap 9 has been described as being bent outward, but as shown in FIG. 1B, the adhesive 10 is provided between the diaphragm 8 and the voice coil 6. Therefore, the cylindrical lower end portion 9a of the center cap 9 is slightly bent outward so that the contact with the diaphragm 8 is reliably performed. For example, the cylindrical lower end 9a of the center cap 9 may be straight.

  In addition, it was confirmed that the outward bending angle A of the cylindrical lower end portion of the center cap 9 in the above embodiment is 60 ° or less as a relative angle with the voice coil 6.

  If it exceeds 60 °, the bending rigidity of the center cap 9 is lowered, and the frequency characteristics are disturbed. More desirably, by setting the angle to 45 ° or less, it is possible to avoid the influence of frequency characteristics due to a decrease in bending rigidity.

(Embodiment 2)
FIG. 2A is a side sectional view of another embodiment of the speaker of the present invention, and FIG. 2B is an enlarged view of a portion A of a joint portion of a voice coil, a diaphragm, and a center cap, which are main parts. In particular, claim 4 will be described.

  Only the differences from the first embodiment will be described with reference to the figure. The difference is the lower end portion of the center cap 9, and the lower end portion in the present embodiment is formed as an outward arcuate bent portion 9b. It is. This arc-shaped bent portion 9b does not have a concentrated change point between the vertical portion 9c at the upper end of the cylinder and the bent portion 9b, so that the deviation of the vibration phase is further improved, and the high high-frequency limit frequency and smoothness are improved. It is possible to provide a speaker with high frequency quality and frequency characteristics.

  The loudspeaker according to the present invention provides high sound quality with excellent high frequency characteristics, and is mounted not only on video / audio equipment but also on-vehicle video / audio equipment aiming at high sound quality in the passenger compartment. It is used for a wide range of applications.

(A) Side sectional view of speaker according to one embodiment of the present invention, (b) Enlarged view of part A for explaining a coupling state of a diaphragm, a center cap, and a voice coil, which are the main parts of the speaker. (A) Side sectional view of the speaker of the other embodiment, (b) Enlarged view of part A for explaining the coupling state of the diaphragm, the center cap, and the voice coil, which are the main parts. (A) Side sectional view of a conventional speaker, (b) Enlarged view of part B for explaining the coupling state of the diaphragm, the center cap, and the voice coil, which are the same main parts. A perspective sectional view of a diaphragm, a voice coil, and a center cap, which are the main parts of a speaker in the other related art

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Magnetic circuit 2 Plate 3 Magnet 4 Yoke 5 Frame 6 Voice coil 7 Damper 8 Diaphragm 9 Center cap 9a Lower end part 9b Bending part 9c Vertical part

Claims (4)

A magnetic circuit, a frame joined to the magnetic circuit, a voice coil inserted into a magnetic gap of the magnetic circuit, a damper having an inner periphery coupled to the voice coil and an outer periphery coupled to the frame, A speaker having a periphery coupled to the voice coil and an outer periphery coupled directly or indirectly to the frame, and a center cap coupled on the voice coil, wherein the center cap is The cylindrical portion has a cylindrical portion extending substantially perpendicularly to the outer periphery, the inner diameter of the cylindrical portion is set to a diameter that fits at least the outer diameter of the upper end of the voice coil, and the cylindrical end portion is in contact with the diaphragm. Speaker. The speaker according to claim 1, wherein the cylindrical end portion has a bent portion bent in the outer peripheral direction from the middle thereof. The speaker according to claim 1, wherein the relative angle between the cylindrical portion and the bent portion extending substantially vertically is 60 ° or less. The speaker according to claim 1, wherein a cross section of the bent portion has an arc shape.

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