JPWO2015064340A1 - Sound vibration generator - Google Patents

Abstract

Provided is a sound vibration generating element that improves the conversion efficiency into sound vibration and suppresses power consumption. Furthermore, the present invention provides an audio vibration generating element with improved frequency characteristics and improved sound quality. The sound vibration generating element 1, which has a frame 2 having an internal space, a fixed coil 3 fixed to the frame 2, a vibration coil 4 attached to the frame so as to be able to vibrate, a loop inside of the fixed coil 3, And / or a magnet group 5 including one or a plurality of magnets arranged outside the loop and inside the loop of the vibration coil 4 and / or outside the loop, and the magnet group 5 on the frame 2. A magnet group elastic body 6 attached so as to be able to vibrate and a vibration coil elastic body 7 attached so that the vibration coil 4 can vibrate on the frame.

Description

  The present invention relates to a sound vibration generating element typified by a bone conduction vibration generating element, and in particular, a technique for improving the conversion efficiency to sound vibration to suppress power consumption and further improving frequency characteristics to improve sound quality. It is about.

  In recent years, various bone conduction vibration generating elements have been developed, and bone conduction speakers and bone conduction earphones using the elements have been put on the market. Bone conduction refers to a mechanism of sound recognition in which bone conduction vibration (bone conduction sound) conducted through bone is directly transmitted to the cochlea through body tissues such as the skull without passing through the eardrum and the ossicle.

  In normal sound recognition, sound (air conduction sound) is transmitted to the inner ear by vibrating the eardrum through the air, but bone conduction sound does not require the outer ear and the middle ear, so the sound vibration of bone conduction speakers, bone conduction earphones, etc. The generating element is particularly effective for a hearing aid for a hearing-impaired hearing person with a disability in the outer or middle ear.

  In addition, since the bone conduction sound can be heard without being disturbed by the air conduction sound, it is particularly effective in a place where external noise is intense. For example, in highway construction, it is expected to significantly reduce the number of accidents by attaching a voice vibration generating element to a worker's helmet and using it for conversations between workers and alerting workers to ensure safety. Is done. Further, the sound vibration generating element can be mounted without blocking the ear canal, and can listen to external sound normally while listening to music or the like, which is suitable for jogging and cycling.

  Patent Document 1 discloses a bone conduction speaker in which the vibration efficiency of a vibration member is increased and the performance is greatly improved (see FIGS. 1 and 2 of Patent Document 1). Patent Document 2 discloses a bone conduction earphone that instantly reacts to a weak current change that is supplied, thereby making it possible to achieve higher sound quality and lower current consumption rate (Patent Document 2). 2 to 3).

JP 2007-129384 A JP 2008-131470 A

  Sound vibration generating elements such as conventional bone conduction speakers and bone conduction earphones are somewhat less sensitive than ordinary speakers and earphones, so the sound is low when connected to a portable device. There is a tendency to be spicy and battery consumption is fast.

  The present invention has been made in consideration of the conventional problems as described above, and provides a sound vibration generating element that improves the conversion efficiency into sound vibration and suppresses power consumption. Furthermore, the present invention provides an audio vibration generating element with improved frequency characteristics and improved sound quality.

  The sound vibration generating element of the present invention capable of solving the above problems includes a frame having an internal space, a fixed coil fixed to the frame, a vibration coil attached to the frame so as to vibrate, and the fixed A magnet group including one or a plurality of magnets arranged inside and / or outside the loop of the coil and inside the loop and / or outside the loop of the vibration coil, and the magnet group A magnet group elastic body attached to the frame so as to vibrate, and a vibration coil elastic body attached to the frame so that the vibration coil can vibrate.

  In the sound vibration generating element, it is preferable that a peripheral portion of the elastic body for the vibration coil is fixed to the frame, and the vibration coil is attached coaxially.

  In the sound vibration generating element, it is preferable that the elasticity for the vibration coil is made of an integrally molded resin.

  Further, in the sound vibration generating element, the magnet group includes a fixed coil inner magnet disposed inside the fixed coil loop, a fixed coil outer magnet disposed outside the fixed coil loop, and the vibration coil loop. It is preferable to include a vibration coil inner magnet disposed inside.

  Further, in the sound vibration generating element, the elastic member for the magnet group can vibrate a central part to which the magnet group is attached, a peripheral part fixed to the frame, and the central part and the peripheral part. It is preferable that the connection part connected to is included.

  In the sound vibration generating element, the magnet group elastic body has a through hole between the central portion and the peripheral portion, and there are two or more connecting portions, each of which is two-dimensional or three-dimensional. It is preferably dimensionally curved and longer than the linear distance between the central portion and the peripheral portion.

  In the sound vibration generating element according to the present invention, a magnet group having a relatively large inertia is attached to the frame so as to vibrate, and a stationary coil having a relatively small inertia is fixed to the frame. The vibration amplitude increases. Thereby, generation | occurrence | production of an air conduction sound decreases and an audio | voice vibration can be generated efficiently.

  Furthermore, since the vibration vibration element is attached to the frame so that it can vibrate, the vibration vibration element has a sufficiently small inertia compared to the frame and has a good response. Sound vibrations in difficult frequency bands can be generated by the combination of the vibration coil and the magnet group, and the conversion efficiency to sound vibration is greatly improved. Therefore, it is possible to provide an audio vibration generating element with reduced power consumption, and further improve the frequency characteristics, thereby improving the sound quality.

1 is an external view of a sound vibration generating element according to an embodiment of the present invention. It is ZZ sectional drawing of the sound vibration generating element which concerns on embodiment of this invention. It is a disassembled perspective view of the audio | voice vibration generating element which concerns on embodiment of this invention.

<Configuration>
As shown in FIGS. 1 to 3, the sound vibration generating element 1 according to the present invention includes a frame 2, a fixed coil 3, a vibration coil 4, a magnet group 5, a magnet group elastic body 6, and a vibration coil elastic body 7. . The frame 2 is an outer box having an internal space, and includes a body portion 2a, an inner cover 2b, an outer cover 2c, and a plate 2d.

  The fixed coil 3 is a voice coil that drives the frame 2 and the magnet group 5 by passing a current signal corresponding to the sound to be heard, and is fixed to the plate 2 d of the frame 2.

  The vibration coil 4 is a voice coil that drives the frame 2 and the magnet group 5 by passing a current signal corresponding to the sound to be heard together with the fixed coil 3, and can vibrate the frame 2 via the vibration coil elastic body 7. It is attached.

  When the sound vibration generating element 1 is used, lead wires and wiring boards (both not shown) for supplying current signals to the fixed coil 3 and the vibration coil 4 are attached, and iron powder or the like is placed inside. The entire surface may be coated with a resin or the like so as not to enter.

  In addition, the same current signal may be supplied to the stationary coil 3 and the vibration coil 4, but it is expected that the conversion efficiency to sound vibration can be improved by supplying different current signals. For example, the current signal of one sound source is divided into two for each sound range, the current signal corresponding to the low sound range is supplied to the fixed coil 3, and the current signal corresponding to the high sound range is supplied to the vibration coil 4. Like a speaker, all of the normal audible range of a person can be efficiently reproduced.

  The magnet group 5 is an aggregate including one or a plurality of magnets and, if necessary, a magnetic shielding plate, and at least a portion close to both the fixed coil 3 and the vibration coil 4 is necessary. It is preferable that it is arranged inside the loop and / or outside the loop and arranged inside the loop of the vibration coil 4 and / or outside the loop.

  Specifically, the magnet group 5 is arranged inside the fixed coil inner magnet 5 a arranged inside the fixed coil 3, the fixed coil outside magnet 5 b arranged outside the fixed coil 3 loop, and inside the loop of the vibration coil 4. And a vibrating coil inner magnet 5c. The magnet group 5 preferably further includes magnetic shielding plates 5d to 5g and fixing split pins 5h and 5i.

  The fixed coil inner magnet 5a, the fixed coil outer magnet 5b, the vibration coil inner magnet 5c, and the magnetic shielding plates 5d to 5g all have the same shape as a flat washer having a circular hole in the center of the disk.

  The outer diameters of the fixing split pins 5h and 5i, the inner diameter of the magnetic shielding plate 5d, the inner diameter of the stationary coil inner magnet 5a, the inner diameter of the vibration coil inner magnet 5c, and the inner diameter of the magnetic shielding plate 5g coincide (for example, 1.2 mm). In addition, the outer diameter of the vibration coil inner magnet 5c matches the inner diameter of the magnetic shielding plate 5e (for example, 7.0 mm).

  The outer diameter of the magnetic shielding plate 5g is slightly larger (for example, 7.2 mm) than the inner diameter (for example, 7.0 mm) of the magnetic shielding plate 5e. Further, the inner diameter of the vibration coil 4 is slightly larger (for example, 7.4 mm) than the outer diameter (for example, 7.2 mm) of the magnetic shielding plate 5g.

  The outer diameter of the stationary coil inner magnet 5a is larger (for example, 8.4 mm) than the outer diameter (for example, 7.76 mm) of the vibration coil 4. Further, the outer diameter of the magnetic shielding plate 5e is slightly larger (for example, 8.5 mm) than the outer diameter (for example, 8.4 mm) of the fixed coil inner magnet 5a.

  The inner diameter of the fixed coil 3 is slightly larger (for example, 9.0 mm) than the outer diameter (for example, 8.5 mm) of the magnetic shielding plate 5e. Further, the inner diameter of the magnetic shielding plate 5f is larger (for example, 10.5 mm) than the outer diameter (for example, 9.8 mm) of the fixed coil 3.

  The inner diameter of the fixed coil outer magnet 5b is slightly larger (for example, 10.6 mm) than the inner diameter (for example, 10.5 mm) of the magnetic shielding plate 5f. Further, the outer diameter of the magnetic shielding plate 5d, the outer diameter of the stationary coil outer magnet 5b, and the outer diameter of the magnetic shielding plate 5f coincide (for example, 14.0 mm).

  The magnet group elastic body 6 is an elastic body such as a spring, rubber, or resin that attaches the magnet group 5 to the frame 2 so as to be able to vibrate, and is fixed to the center portion 6 a to which the magnet group 5 is attached and the frame 2. And a connecting portion 6c that connects the center portion 6a and the peripheral portion 6b so as to vibrate.

  The central portion 6a has a through hole 6d having the same size as the outer diameter of the fixing split pins 5h and 5i. The through-hole 6d, the magnetic shielding plate 5d, the fixed coil inner magnet 5a, the vibration coil inner magnet 5c, and the magnetic shielding plate 5g are fixed by fixing split pins 5h and 5i. These can be fixed using various adhesives, for example, and may be fixed by any other method.

  It is preferable that the magnet group elastic body 6 further has a through hole 6d between the center portion 6a and the peripheral portion 6b. By changing the size and number of the through holes 6d, the output frequency characteristics of the sound vibration generating element 1 can be changed. For example, for music, the output frequency characteristics can be adjusted to be flat over a wide band. For hearing aids, it is possible to adjust the output frequency characteristics to be specific to the intermediate region used in normal conversation so that the conversation can be heard more clearly.

  The magnet group elastic body 6 is preferably made of a highly durable material because the magnet group 5 having a relatively heavy weight must be held so as to vibrate. Moreover, there are two or more connecting portions 6c, each of which is two-dimensionally or three-dimensionally curved, and is preferably longer than the linear distance between the center portion 6a and the peripheral portion 6b.

  The elastic body 7 for the vibration coil is an elastic body such as a spring or rubber that attaches the vibration coil 4 to the frame 2 so as to vibrate. The peripheral edge portion 7a is fixed to the frame 2, and the vibration coil 4 is formed at the center portion 7b. It is attached coaxially. In addition, since it is preferable that the elastic body 7 for vibration coils is provided with various characteristics similar to cones for general headphones and earphones that generate air conduction sound, the cone can be used. Moreover, it is preferable that the elastic body 7 for vibration coils is the resin integrally molded.

  According to the sound vibration generating element 1 according to the present invention, the magnet group 5 having a relatively large inertia is attached to the frame 2 so as to vibrate, and the stationary coil 3 having a relatively small inertia is fixed to the frame 2. The vibration amplitude is small and the vibration amplitude of the frame 2 is large. Thereby, generation | occurrence | production of an air conduction sound decreases and an audio | voice vibration can be generated efficiently.

  Further, since the sound vibration generating element 1 is attached to the frame 2 so as to be able to vibrate, the inertia of the vibration coil 4 is sufficiently smaller than that of the frame 2 and has good responsiveness. 5 can generate sound vibration in a frequency band that is difficult to be generated by the combination of the vibration coil 4 and the magnet group 5, and the conversion efficiency into sound vibration is greatly improved. Therefore, it is possible to provide an audio vibration generating element with reduced power consumption, and further improve the frequency characteristics, thereby improving the sound quality.

  This application claims the benefit of priority based on Japanese Patent Application No. 2013-224762 filed on Oct. 29, 2013. The entire contents of the specification of Japanese Patent Application No. 2013-224762 filed on October 29, 2013 are incorporated herein by reference.

  The sound vibration generating element of the present invention can be widely used for bone conduction speakers, bone conduction earphones, and the like.

DESCRIPTION OF SYMBOLS 1 Sound vibration generating element 2 Frame 2a Body part 2b Inner cover 2c Outer cover 2d Plate 3 Fixed coil 4 Vibration coil 5 Magnet group 5a Fixed coil inner magnet 5b Fixed coil outer magnet 5c Vibration coil inner magnet 5d-5g Magnetic shielding plate 5h, 5i Fixing Split Pin 6 Magnet Group Elastic Body 6a Center Part 6b Peripheral Part 6c Connection Part 6d Through-hole 7 Vibration Coil Elastic Body 7a Peripheral Part 7b Central Part

Claims (6)

An audio vibration generating element,
A frame having an internal space;
A stationary coil secured to the frame;
A vibration coil attached to the frame so as to vibrate;
A group of magnets including one or a plurality of magnets arranged inside and / or outside the loop of the fixed coil and arranged inside and / or outside the loop of the vibration coil;
An elastic body for a magnet group, which is attached to the frame so as to vibrate the magnet group;
An audio vibration generating element, comprising: an elastic body for a vibration coil that is attached to the frame so as to vibrate the vibration coil. The vibration coil elastic body is:
The sound vibration generating element according to claim 1, wherein a peripheral portion is fixed to the frame, and the vibration coil is coaxially attached. The vibration coil elastic body is:
The sound vibration generating element according to claim 2, wherein the sound vibration generating element is integrally molded resin. The magnet group is
A fixed coil inner magnet disposed inside the loop of the fixed coil;
A stationary coil outer magnet disposed outside the loop of the stationary coil;
The sound vibration generating element according to claim 1, further comprising a vibration coil inner magnet disposed inside the loop of the vibration coil. The magnet group elastic body is:
The center part to which the said magnet group is attached, the peripheral part fixed to the said flame | frame, and the connection part which has connected this center part and this peripheral part so that vibration is possible. The sound vibration generating element according to any one of claims. The magnet group elastic body is:
Having a through hole between the central portion and the peripheral portion;
The connecting portion is
The sound vibration generating element according to claim 5, wherein there are two or more, each of which is curved two-dimensionally or three-dimensionally and is longer than a linear distance between the central portion and the peripheral portion.