JP5112159B2 - Electromagnetic electroacoustic transducer - Google Patents

Description

  The present invention relates to an electromagnetic electroacoustic transducer for a speaker mounted on a front panel or the like of a television receiver, and more particularly to an electromagnetic electroacoustic transducer suitable for use in a mounting space having a very limited size, particularly a small width. Related to the vessel.

  FIG. 9 shows a schematic diagram of the configuration of a conventional general speaker. In the figure, the magnetic circuit comprises an annular magnet 1, a disc-shaped yoke 2 having a cylindrical pole piece 3 in the center and a magnet 1 placed on the circumference, and a plate 4 placed on the magnet 1. A voice coil 5 wound around the outer periphery of one end of a cylindrical coil bobbin is inserted into a magnetic gap formed between the outer peripheral surface of the head of the pole piece 3 and the inner peripheral surface of the plate 4. The coil bobbin is held at the inner peripheral end of the annular damper 6 on the outer periphery of the other end, the outer peripheral end of the damper 6 is fixed to the inner peripheral part of the conical frame 7, and the coil bobbin carrying the voice coil 5 is held by the damper 6. In the axial direction, the magnetic gap is held so as to be able to vibrate. The other end edge of the coil bobbin is coupled to the inner peripheral end of the cone-type diaphragm 8, and the outer peripheral end of the diaphragm 8 is fixed to the outer peripheral portion of the frame 7 through the edge so as to vibrate. In this configuration, when a voice signal is applied to the voice coil 5, the voice coil 5 vibrates in the magnetic gap, and this vibration drives the diaphragm 6 to generate voice.

  In the speaker having the above configuration, in order to hold the cylindrical voice coil in the circular magnetic gap, it is necessary to surround the outer periphery of the voice coil 5 by a magnetic circuit in which the annular plate 4 and the magnet 1 are combined with the disc-shaped yoke 2. There is. Therefore, since the outer diameter of the speaker is defined by the dimensions of the magnetic circuit plate, magnet and yoke, it is impossible to reduce it beyond a certain limit.

For example, as seen in Patent Document 1, various speakers having an outer shape of an ellipse, an ellipse, a rectangle, etc. have been proposed in order to adapt to a narrow and narrow installation space, and a voice coil and a magnetic circuit are also elliptical. The size is reduced by following the external shape of the speaker in the form of a rectangle or a rectangle, but in any case there is no change in the configuration that surrounds the outer periphery of the voice coil with a magnetic circuit, so measures to change the external shape are also in the width direction of the special speaker It has not helped with a significant reduction in size. In addition, no attempt has been made to make the electroacoustic conversion means have an elongated outer shape with a configuration other than the shape in which the magnetic coil surrounds the voice coil.
Japanese Patent No. 3478466

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an electromagnetic electroacoustic transducer capable of making the external shape of a speaker sufficiently elongated with a configuration different from that of an electroacoustic transducer in a conventional speaker.

Electromagnetic transducer according to claim 1 includes a vibration member made of a magnetic material longitudinally extending inserted through into the voice coil along the axis of the longitudinal tubular voice coil and the voice coil for applying an audio signal, a damper for supporting the vibratable longitudinally in a direction perpendicular to said vibration member in its longitudinal direction, from the yoke of each pair to form a magnetic gap that concentrate the magnetic flux and connected to the magnet and the magnet generates magnetic flux comprising a magnetic circuit of the pair of the vibration member is characterized in that it is supported by disposed within the magnetic gap of the magnetic circuit of a pair of opposite ends of the magnetic body.
Electromagnetic transducer according to claim 2, wherein the vibration member is equal to or to concentrate at both ends in the longitudinal direction of the magnetic body magnetic field generated in the voice coil when the voice signal is applied attracts the magnetic body.
Electromagnetic transducer according to claim 3, wherein the longitudinally disposed ends of the magnetic circuit the magnetic body of the vibration member, each of the magnetic circuit that is arranged to the magnetic field in the opposite direction Features.
Electromagnetic transducer according to claim 4, wherein the magnetic body is overlapped two plate-like member, said vibration member and the damper is inserted between the two plate-like member of the vibrating member It is characterized by supporting.
Electromagnetic transducer according to claim 5, wherein the damper is characterized by comprising a leaf spring.
Electromagnetic transducer according to claim 6, characterized in that the damper to maintain the ends of the magnetic body to the center position within the magnetic gap.
Electromagnetic transducer according to claim 7, the depth of each said frame inside which face each other is fixed to one of the longitudinal sides and a rectangular box type in which the opening frame, the longitudinal end portions of the inside of the frame a magnetic circuit of a pair consisting of a magnet and a yoke forming a magnetic gap that occurs in the opposite direction of the magnetic field from each other are substantially at the center of the direction, 2 the magnet and the yoke of the up and down along the central plane of the magnetic gap as it divided into portions, two superimposed longitudinal plate-like magnetic body and the magnetic body of the longitudinal end portions other becomes the main part voice coil wound around the vibration member and a by the voice coil was and those collected on the magnetic as both ends of the magnetic body magnetic field produced by the audio signal is different poles from each other applied to the, one end portion of the magnetic circuit upper and lower The other end portion with being sandwiched between the divided fixed in a depth direction of the frame between the magnetic circuit of a pair of said vibration member is sandwiched between two magnetic material both end portions of the vibrating member and a pair of damper that vibratable holding said vibration member is characterized Rukoto disposed within the magnetic gap of the magnetic circuit of a pair of opposite ends of the magnetic body.

  The electromagnetic electroacoustic transducer according to the present invention forms a vibrating member by inserting a longitudinal magnetic body along the axis of a voice coil wound in a longitudinal cylinder, and forms both ends of the magnetic body exposed from the voice coil. Each of the vibration members can be vibrated in the direction orthogonal to the axial direction by being held in the longitudinal direction by the dampers, and the magnets of a pair of magnetic circuits in which both ends of the vibration members are arranged at both ends in the longitudinal direction of the vibration members, respectively. The structure is supported in the gap, and the vibration of the vibration member due to the magnetic field generated by the application of the audio signal to the voice coil and the magnetic field of the magnetic gap is extracted and transmitted to the diaphragm. Thus, the width dimension of the electromagnetic electroacoustic transducer can be remarkably reduced.

  In order to describe the present invention in more detail, embodiments shown in the attached drawings will be described.

  FIG. 1 shows an assembly of a voice coil 13 and a magnetic body 14 forming a vibrating member V in the electromagnetic electroacoustic transducer of Example 1 according to the present invention, and the voice coil 13 has a longitudinal cylindrical shape with a rectangular cross section. The magnetic body 14 is wound, and a longitudinal plate material used as, for example, an iron core is inserted into the cylindrical voice coil 13 along an axis in a two-layer stack here. Both end portions of the magnetic body 14 are exposed from both ends of the voice coil 13 by substantially the same length.

  2 is a longitudinal sectional view of the electromagnetic electroacoustic transducer 10 of Example 1 configured by combining the vibrating member V shown in FIG. 1 with a pair of magnetic circuits M, and FIG. 3 is a sectional view taken along line II-II in FIG. FIG. In the figure, the vibrating member V sandwiches one end portion of a pair of dampers 15 made of a plate-like elastic material such as a leaf spring between two magnetic bodies 14 at both end portions thereof. The end portion is sandwiched and fixed between two superposed thick plate-like magnets 11 in each of a pair of magnetic circuits M arranged at both ends of the vibration member V. Accordingly, the vibrating member V is held by a pair of magnetic circuits M positioned in the longitudinal direction of the vibrating member V so as to be able to vibrate in the thickness direction of the magnetic body 14 via the damper 15.

  In the magnetic circuit M, the upper and lower sides of the two stacked magnets 11 are sandwiched between the long legs of the two yokes 12 each having an L-shaped cross section, and the both ends of the magnetic body 14 of the vibrating member V are sandwiched between the short legs. By sandwiching and opposing each other, a magnetic gap G is formed between the tips of the short legs of the yoke 12, and both ends of the vibration member V are arranged at the center positions in the pair of magnetic gaps G positioned in the longitudinal direction. These pair of magnetic gaps G constitute each magnetic circuit M so that the directions of the magnetic fields are opposite to each other. Both magnetic circuits M are fixed to both ends of a rectangular box-shaped frame 18 whose one side surface in the longitudinal direction is open, and the vibration member V is elastically held via the damper 15 in the longitudinal direction.

  In the electromagnetic electroacoustic transducer 10 having the above-described configuration, when an electrical signal representing sound is applied to the voice coil 13, a magnetic field is generated in the voice coil 13, and the generated magnetic field is collected in the magnetic body 14. One end is magnetized to the N pole and the other end is magnetized to the S pole. In the mutual relationship between the polarities of both ends of the magnetic body 14 of the vibrating member V magnetized in this way and the polarities of the magnetic gaps G of both magnetic circuits M into which both ends of the magnetic body 14 are inserted, the vibrating member V The magnetic body 14 is driven in the thickness direction, that is, in the direction of the arrow y shown in FIG. 2A, and vibrates.

  Sound can be reproduced by transmitting the vibration of the vibration member V to a rectangular diaphragm (not shown) held on the opening side edge of the frame 18 via an edge, for example. However, the present invention provides a versatile electromagnetic electroacoustic transducer capable of transmitting to a diaphragm having another desired shape and size without limiting the reproduction frequency characteristic to the characteristic of a rectangular diaphragm.

  4 and 5 show an embodiment in which the electromagnetic electroacoustic transducer 10 according to the present invention adopts the above-described generality. In the figure, the electromagnetic electroacoustic transducer 10 has the same configuration and operation as those described above with reference to FIGS. 1 and 2 and is arranged in close proximity to the opening side surface of the frame 18. An adapter 17 is inserted between the plate 16 and the vibrating member V of the electromagnetic electroacoustic transducer 10 to drive the vibrating plate 16 by the vibration of the vibrating member V.

  The adapter 17 is formed in a table shape as seen in the longitudinal sectional view of FIG. 4 and in a substantially T shape in the transverse sectional view of FIG. 5 along the line III-III. A top plate joined to the rear surface of the diaphragm with a flat rectangular outer surface extending along the magnetic body, and a magnetic body exposed toward the opening of the frame 18 at both ends of the top plate in the longitudinal direction and both ends of the voice coil 13 of the vibration member V It consists of a pair of legs that connect between the 14 surfaces. Adhesion is maintained between the top plate and the diaphragm 16 and between the leg portion and the magnetic body 14. Further, the outer shape and dimensions of the diaphragm 16 are arbitrarily selected.

  FIG. 6 shows another specific embodiment of the electromagnetic electroacoustic transducer 10 of the present invention. Two electromagnetic electroacoustic transducers 10 are attached to the left and right ends of one panel-shaped diaphragm 16, respectively. By connecting to the left and right channel signal sources of stereo sound, stereo sound can be reproduced.

  FIG. 7 shows still another specific embodiment of the electromagnetic electroacoustic transducer 10 of the present invention, and two electromagnetic electroacoustic transducers 10 are used for stereo provided in the front of the television receiver 19. If it is embedded in the front panel frame while being attached to the left and right ends of the diaphragm 16, stereo sound reproduction can be performed as in the case of FIG. The television image can be displayed on the diaphragm 16. Further, the image display panel 20 can be used as a vibration plate in combination with the electromagnetic electroacoustic transducer of the present invention.

  FIG. 8 shows an electromagnetic electroacoustic transducer 10 according to a second embodiment of the present invention. In this case, in each of the pair of magnetic circuits M, the upper one of the upper and lower magnets 11 in the first embodiment is omitted, and the upper leg 12a of the upper yoke 12a is thickened accordingly. And the same magnetic field as the electromagnetic electroacoustic transducer 10 of Example 1 is comprised. According to the second embodiment, therefore, the same operation and effect can be obtained with higher economic efficiency than the first embodiment.

The perspective view which shows the vibration member which comprises the electromagnetic type electroacoustic transducer of this invention. The longitudinal cross-sectional view which shows the structure of the electromagnetic type electroacoustic transducer by this invention in Example 1 using the vibration member of FIG. FIG. 2B is a cross-sectional view of the electromagnetic electroacoustic transducer taken along line II-II in FIG. 2A. 1 is a longitudinal sectional view showing an embodiment of a diaphragm of an electromagnetic electroacoustic transducer of Example 1. FIG. FIG. 3B is a cross-sectional view of the electromagnetic electroacoustic transducer taken along line III-III in FIG. 3A. The perspective view of other embodiment which shows the combination with the diaphragm for stereo reproduction | regeneration of the electromagnetic type electroacoustic transducer of Example 1. FIG. The perspective view of further another embodiment which shows the stereo reproduction | regeneration structure in the television receiver of the electromagnetic type electroacoustic transducer of Example 1. FIG. FIG. 6 is a longitudinal sectional view showing a configuration of an electromagnetic electroacoustic transducer of the present invention in Example 2. Sectional drawing which shows the structure of the conventional speaker.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Electromagnetic type electroacoustic transducer 11 Magnet 12 Yoke 13 Voice coil 14 Magnetic body 15 Damper 16 Vibration plate 17 Adapter 18 Frame 19 Television receiver 20 Image display panel V Vibration member M Magnetic circuit G Magnetic gap

Claims (7)

A vibration member made of a magnetic material longitudinally extending inserted through into the voice coil along the axis of the longitudinal tubular voice coil and the voice coil for applying an audio signal, in the direction perpendicular to the vibration member in the longitudinal direction comprising a damper for oscillating movably supported in the longitudinal direction, and a magnetic circuit of a pair consisting of each pair of yokes forming a magnetic gap that concentrate the magnetic flux and connected to the magnet and the magnet generates magnetic flux, the vibration electromagnetic transducer member is characterized in that it is supported by disposed within the magnetic gap of the magnetic circuit of a pair of opposite ends of the magnetic body. Said vibrating member is characterized in that to concentrate at both ends in the longitudinal direction of the magnetic attracting magnetic field generated in the voice coil when the voice signal applied to the magnetic body, the electromagnetic transducer of claim 1, wherein. The magnetic circuit is arranged at both ends in the longitudinal direction of the magnetic of the vibration member, each of said magnetic circuit characterized in that it is arranged to the magnetic field in the opposite direction, the electromagnetic type electroacoustic according to claim 1, wherein Acoustic transducer. The magnetic body of the vibration member is overlapped two plate-like member, the damper is characterized by supporting the vibrating member is inserted between the two plate-like member, according to claim 1 4. The electromagnetic electroacoustic transducer according to any one of items 1 to 3. The electromagnetic electroacoustic transducer according to claim 4, wherein the damper is a leaf spring. The damper is characterized by maintaining the ends of the magnetic body to the center position within the magnetic gap, the electromagnetic transducer of claim 1, wherein. And a rectangular box type in which the opening of one of the longitudinal side frames, a reverse magnetic field to each other substantially at the center in the depth direction of each said frame inside which face each other is fixed to the longitudinal end portions of the inside of the frame a magnetic circuit of a pair consisting of a magnet and a yoke forming a magnetic gap that occurs, said magnet and said yoke as divided into two parts vertically along the central plane of the magnetic gap, overlapped 2 Like the longitudinal plate-like magnetic body and the magnetic longitudinal end portions other than the main portion magnetic field the magnetic caused by the audio signal applied to the voice coil a vibrating member formed of a voice coil wound around the the the other end of the both ends and those collected on said magnetic body so as to be different poles each other, while being held between the end portions between the upper and lower portions of the magnetic circuit fixed And a pair of dampers which can vibrate held in the depth direction of the frame between the magnetic circuit of a pair of said vibration member is sandwiched between two magnetic material both end portions of the vibrating member minute , electromagnetic transducer the vibration member, wherein Rukoto disposed within the magnetic gap of the magnetic circuit of a pair of opposite ends of the magnetic body.

Images