JP2006101203A - Speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker capable of reducing mutual interference between the vibration of a small-dimension voice coil and the vibration of a large-dimension voice coil as much as possible. <P>SOLUTION: The speaker is provided with a diaphragm 10 having an annular main vibrator 11, an inside supporting part 12 for supporting the inside of dimensional direction of the main vibration unit 11, and an outside supporting part 14 for supporting the outside of dimensional direction of the main vibrator 11; a large-dimension voice coil unit 55 attached on the external edge of the main vibrator 11 in the diaphragm 10; and a small-dimension voice coil unit 50 attached on the inside edge of the main vibrator 11. In the speaker, the stiffness of the supporting part 12 is made to be higher than the stiffness of the supporting part 14. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a speaker used in an audio device, and more particularly, to a speaker including two voice coils having different diameters arranged concentrically.

Conventionally, a so-called double voice coil speaker having two voice coils has been proposed (see, for example, Patent Document 1). In this type of speaker, a small-diameter voice coil and a large-diameter voice coil are concentrically mounted on a diaphragm formed of paper, cloth or the like. The diaphragm is vibrated by both the small diameter voice coil and the large diameter voice coil to which the audio signal is supplied, and a sound corresponding to the audio signal is generated. According to such a speaker, a small-diameter voice coil can handle a relatively high frequency band sound, and a large-diameter voice coil can generate a relatively low frequency band sound, thereby producing a wide frequency band sound. It becomes.
Japanese Utility Model Publication No. 53-163120

  However, in the loudspeaker having the structure described above, since the vibration by the small diameter voice coil and the vibration by the large diameter voice coil are given to the common diaphragm, the respective vibrations interfere with each other, and a certain specific The sound in the frequency band is distorted, or resonance occurs in a certain frequency band, for example, a phenomenon in which the sound pressure level in a certain frequency band protrudes as shown by the broken line portion in FIG. .

  The present invention has been made to solve such a conventional problem, and provides a loudspeaker capable of minimizing the mutual interference between vibration caused by a small diameter voice coil and vibration caused by a large diameter voice coil. is there.

  The speaker according to the present invention includes a diaphragm having a ring-shaped main vibration portion, an inner support portion that supports a radially inner side of the main vibration portion, and an outer support portion that supports a radially outer side of the main vibration portion. And a large-diameter voice coil unit mounted on the outer edge of the main vibration portion of the diaphragm, and a small-diameter voice coil unit mounted on the inner edge of the main vibration portion, the inner support portion The stiffness is made higher than the stiffness of the outer support portion.

  With this configuration, the stiffness of the inner support portion on the radially inner side of the main vibration portion is higher than the stiffness of the outer support portion on the radially outer side of the main vibration portion, and the rigidity of the inner support portion is higher than that of the outer support portion. taller than. For this reason, the vibration by the small diameter voice coil unit near the rigid inner support portion can be made smaller than the vibration by the large diameter voice coil unit, and the influence of the vibration by the small diameter voice coil unit on the vibration by the large diameter voice coil unit can be reduced. Can be small. Moreover, since the rigidity of the inner support portion close to the small-diameter voice coil unit is relatively high, the vibration caused by the small-diameter voice coil unit can be hardly affected by the vibration caused by the large-diameter voice coil unit.

  By changing the shape of each of the inner support portion and the outer support portion, their stiffness can be changed, and also their stiffness can be changed by changing their materials.

  In the former case, in the speaker according to the present invention, each of the inner support part and the outer support part has a curved cross section, and the curved diameter of the inner support part is smaller than the curved diameter of the outer support part. The stiffness of the inner support portion may be higher than the stiffness of the outer support portion.

  With this configuration, even if the main vibration part, the inner support part, and the outer support part are integrally formed of the same material, the stiffness of the inner support part is higher than the stiffness of the outer support part. can do.

  According to the speaker of the present invention, the influence of the vibration by the small diameter voice coil unit on the vibration by the large diameter voice coil unit can be reduced, and the vibration by the small diameter voice coil unit can reduce the influence of the vibration by the large diameter voice coil unit. Since it can be made difficult to receive, the mutual interference between the vibration by the small diameter voice coil unit and the vibration by the large diameter voice coil unit can be minimized. As a result, it is possible to reduce the distortion of the frequency characteristics of the output sound as much as possible.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  A speaker according to an embodiment of the present invention is configured as shown in FIGS. FIG. 1 is a plan view of the speaker, and FIG. 2 is a cross-sectional view taken along the line AA in FIG.

  1 and 2, the speaker includes a yoke 20 and a diaphragm 10 that is united with the yoke 20. The diaphragm 10 formed of synthetic resin, paper, cloth, or the like includes a ring-shaped main vibration portion 11, a ring-shaped inner support portion 12 that supports a radially inner side of the main vibration portion 11, and the main vibration portion 11. And a ring-shaped outer support portion 14 that supports the radially outer side, and a flat portion 13 is formed inside the ring-shaped inner support portion 12. Each cross section (refer FIG. 2) of the main vibration part 11, the inner side support part 12, and the outer side support part 14 becomes the curved shape which protrudes in the front side of the said speaker.

The bending diameters of the main vibration part 11, the inner support part 12, and the outer support part 14 are set so as to obtain desired sound output characteristics. In particular, in the present embodiment, the main vibration part 11 and the inner support part are supported. The outer support portion 14 and the outer support portion 14 are integrally formed of the same material, and the inner support portion 12 has a curved diameter smaller than that of the outer support portion 14. It is larger than the stiffness. Further, the bending diameter of the main vibration part 11 is set several times larger than that of the inner support part 12 and the outer support part 14, and most of the sound that can be generated by this speaker is output from the main vibration part 11.

  An inner spacer 61 made of synthetic resin or the like is bonded and fixed to the back surface of the flat portion 13 located at the center of the diaphragm 10. Convex portions 61 a are formed on the surface of the inner spacer 61 opposite to the bonding surface with respect to the diaphragm 10 (flat portion 13). A ring-shaped outer spacer 62 made of synthetic resin or the like is bonded and fixed to the back surface of the outermost peripheral edge portion that continues further outside the outer support portion 14 in the diaphragm 10. A large-diameter voice coil unit 55 is attached to the back side outer edge of the main vibration portion 11 of the diaphragm 10, and a small-diameter voice coil unit 50 is attached to the back side inner edge of the main vibration portion 11. The small-diameter voice coil unit 50 has a structure in which a small-diameter voice coil 51 is wound around a predetermined position of a small-diameter bobbin 52 having a diameter substantially equal to the diameter of the inner edge of the main vibration portion 11. It is bonded and fixed to the inner edge on the back side of the vibration part 11. The large diameter voice coil unit 55 has a structure in which a large diameter voice coil 56 is wound around a predetermined position of a large diameter bobbin 57 having a diameter substantially equal to the diameter of the outer edge of the main vibration portion 11. One end portion of 57 is bonded and fixed to the outer edge of the back side of the main vibration portion 11.

  The yoke 20 made of a magnetic material includes a disc-shaped bottom portion 21, a ring-shaped outer peripheral wall portion 22 standing on the outer edge end portion of the bottom portion 21, and a central cylindrical portion 23 standing on the center of the bottom portion 21. A ring-shaped groove 24 is formed between the central cylindrical portion 23 and the outer peripheral wall portion 22. A concave portion 23 a is formed on the end surface of the central cylindrical portion 23. A ring-shaped magnet 31 is provided in the groove 24 of the yoke 20 so as to be fixed to the bottom portion 21, and a ring-shaped plate 32 made of a magnetic material is fixed to the end surface of the magnet 31. Yes. A magnetic gap is formed between the inner peripheral surface of the outer peripheral wall portion 22 and the outer peripheral surface of the plate 32 facing each other, and between the outer peripheral surface of the central cylindrical portion 23 and the inner peripheral surface of the plate 32 facing each other. A magnetic gap is formed between them. A ring-shaped diaphragm support 40 is attached to the front outer edge portion of the outer peripheral wall portion 22 of the yoke 20. A ring-shaped protrusion 41 is formed on the inner side in the radial direction of the support end surface of the diaphragm support 40.

  The convex portion 61a of the inner spacer 61 bonded and fixed to the diaphragm 10 is fitted into the concave portion 23a formed on the end surface of the central cylindrical portion 23 of the yoke 20, and the inner edge of the outer spacer 62 bonded and fixed to the diaphragm 10 With the projection 41 in contact with the inner spacer 61 and the outer spacer 62 are bonded and fixed to the central cylindrical portion 23 of the yoke 20 and the support end surface of the diaphragm support 40, respectively. The radial direction of the diaphragm 10 with respect to the yoke 20 (drawing) by fitting the convex portion 61a of the inner spacer 61 with the concave portion 23a of the central cylindrical portion 23 and contacting the inner edge of the outer spacer 62 with the protrusion 41 of the vibration support 40. (Left / Right direction) Position is regulated. Further, the thickness of the inner spacer 61 and the total thickness of the outer spacer 62 and the diaphragm support 40 are set to coincide with each other. ) Position restriction is made.

  Due to the positional restriction of the diaphragm 10 with respect to the yoke 20 as described above, the small diameter voice coil 51 of the small diameter voice coil unit 50 is within the magnetic gap between the outer peripheral surface of the central cylindrical portion 23 of the yoke 20 and the inner peripheral surface of the plate 32. The large diameter voice coil 56 of the large diameter voice coil unit 55 is properly disposed in the magnetic gap between the inner peripheral surface of the outer wall 22 of the yoke 20 and the outer peripheral surface of the plate 32. The

  In the speaker having the above-described structure, when an audio signal is applied to the small diameter voice coil 51 and the large diameter voice coil 56, the magnet formed by the small diameter voice coil 51, the large diameter voice coil 56, the yoke 20, the magnet 31 and the plate 32. Due to the magnetic action with the circuit, the large diameter voice coil unit 50 and the small diameter voice coil unit 55 vibrate in the front-rear direction (the axial direction of each voice coil unit) according to the signal waveform of the audio signal. When this vibration is applied to the main vibration part 11 of the diaphragm 10, the main vibration part 11 vibrates together with the inner support part 12 and the outer support part 14 integrated therewith. Due to the vibration of the diaphragm 10 (the main vibration unit 11, the inner vibration unit 12, and the outer vibration unit 14), a sound such as music corresponding to the audio signal is output from the speaker. Then, a desired frequency can be obtained in a relatively wide frequency band in which the vibration in the relatively high frequency band that can be generated by the small diameter voice coil unit 50 and the vibration in the relatively low frequency band that can be generated by the large diameter voice coil unit 55 are superimposed. It becomes an acoustic characteristic from which sound pressure is obtained.

  The vibration of the diaphragm 10 as described above will be described in more detail.

  The stiffness of the inner support portion 12 is higher than the stiffness of the outer support portion 14 by setting the stiffness of the inner support portion 12 higher than the stiffness of the outer support portion 14. For this reason, the vibration by the small diameter voice coil unit 50 close to the inner support portion 12 having high rigidity is smaller than the vibration by the large diameter voice coil unit 55 close to the outer support portion 14 having rigidity lower than the rigidity of the inner support portion 12. The influence of the vibration by the small diameter voice coil unit 50 on the vibration by the large diameter voice coil unit 55 can be reduced. Further, since the rigidity of the inner support portion 12 close to the small diameter voice coil unit 50 is relatively high, the vibration caused by the small diameter voice coil unit 50 is hardly affected by the vibration caused by the large diameter voice coil unit 55.

  As described above, the influence of the vibration by the small diameter voice coil unit 50 on the vibration by the large diameter voice coil unit 55 is reduced, and the vibration by the small diameter voice coil unit 50 is less susceptible to the vibration by the large diameter voice coil unit 55. The mutual interference between the vibration by the voice coil unit 50 and the vibration by the large diameter voice coil unit 55 is reduced. As a result, resonance and distortion due to mutual interference of those vibrations can be suppressed, and stable acoustic characteristics can be obtained in a relatively wide frequency band as shown in FIG.

  Note that, in a relatively high frequency band, the sound pressure level is unlikely to decrease even if the vibration amplitude decreases compared to a relatively low frequency band. For this reason, even if the vibration in the relatively high frequency band by the small diameter voice coil unit 50 is relatively small, a necessary sound pressure level in that frequency band can be obtained.

  In the above-described embodiment, the stiffness of the inner support portion 12 is made higher than the stiffness of the outer support portion 14 by making the curve diameter of the inner support portion 12 smaller than the curve diameter of the outer support portion 14. It is possible to increase the stiffness of the inner support portion 12 and the stiffness of the outer support portion 14 by changing the shape other than the above and by changing the material.

  As described above, the speaker according to the present invention has the effect that the mutual interference between the vibration caused by the small-diameter voice coil and the vibration caused by the large-diameter voice coil can be minimized, and is arranged concentrically. It is useful as a speaker provided with two voice coils of different diameters.

The top view of the speaker which concerns on embodiment of this invention It is AA sectional drawing in FIG. It is a figure which shows the sound pressure-frequency characteristic of the speaker of the structure shown in FIG.1 and FIG.2. It is a figure which shows an example of the sound pressure-frequency characteristic of the conventional speaker.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Diaphragm 11 Main vibration part 12 Inner support part 13 Flat part 14 Outer support part 20 Yoke 21 Bottom part 22 Outer peripheral wall part 23 Central cylindrical part 23a Recessed part 31 Magnet 32 Plate 40 Diaphragm support body 41 Protrusion 50 Small diameter voice coil unit 51 Small diameter Voice coil 52 Small diameter bobbin 55 Large diameter voice coil unit 56 Large diameter voice coil 57 Large diameter bobbin 61 Inner spacer 61a Convex portion 62 Outer spacer

Claims (2)

A diaphragm having a ring-shaped main vibration portion, an inner support portion that supports a radially inner side of the main vibration portion, and an outer support portion that supports a radially outer side of the main vibration portion;
A speaker comprising a large diameter voice coil unit mounted on an outer edge of the main vibration portion in the diaphragm, and a small diameter voice coil unit mounted on an inner edge of the main vibration portion,
The speaker according to claim 1, wherein the stiffness of the inner support portion is higher than the stiffness of the outer support portion. Each of the inner support portion and the outer support portion has a curved cross section,
The speaker according to claim 1, wherein the stiffness of the inner support portion is made higher than the stiffness of the outer support portion by making the curve diameter of the inner support portion smaller than the curve diameter of the outer support portion.

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