JP4032395B2 - Exciters and flat speakers - Google Patents

Description

  The present invention relates to, for example, an exciter as a vibration element for driving a vibration plate and the like, and a flat speaker in which the exciter is fixed to the vibration plate.

  In recent years, flat-plate speakers in which an exciter (vibration element) is fixed to a flat-plate diaphragm have begun to be used in various applications, taking advantage of being able to be thin and widening the diaphragm. In particular, in the future, a flat speaker will be proposed that uses a low-cost, small and lightweight exciter to be installed together with display media such as liquid crystal panels, or for sound guides printed on the diaphragm. However, problems remain in cost, weight reduction, coil reliability, and the like.

  As such an exciter and a flat speaker using the exciter, for example, in Japanese Patent Laid-Open No. 2001-359188 (Patent Document 1), the bobbin portion is wound around a bobbin portion fixed to and integrated with a diaphragm. An exciter having a voice coil for applying vibration to the diaphragm, and a magnetic gap into which the voice coil is inserted, and a magnetic circuit part for forming the magnetic gap are fixed to the inner surface side to accommodate the exciter And the panel speaker provided with the housing connected with a diaphragm is disclosed.

  In the invention in Patent Document 1, the exciter is accommodated in a housing connected to the diaphragm to form a unit, so that the entire exciter including the terminal and the lead wire is protected from external impact by the housing. The drive unit configured as a unit can be used regardless of the dimensions of the diaphragm, and can greatly reduce the manufacturing cost.

  As a means for reducing the size and weight of a magnetic circuit, Japanese Patent Application Laid-Open No. 56-46398 (Patent Document 2) has a substantially annular groove for coil winding formed in a phase and a plurality of magnetic legs. A core made of a substantially bobbin-shaped ferromagnetic material, a coil wound in the annular groove of the core so that the magnetic poles at both ends are magnetized to the same polarity, and around the core There is disclosed a movable magnet type speaker provided with a substantially ring-shaped movable magnet which is arranged so as to be able to vibrate, has magnetic poles of different polarities at axial ends, and is connected to a cone.

In the invention described in Patent Document 2, by arranging the coil and the movable magnet as described above, the number of parts constituting the magnetic circuit can be reduced and the magnetic circuit can be reduced in size and weight as compared with the prior art. It is possible to eliminate the restriction of the input signal applied to the coil by increasing the number of turns.
JP 2001-359188 A (Claim 1, paragraph 0006) JP 56-46398 (Claim 1, Detailed Description of the Invention (8), (9))

  However, as in the invention described in Patent Document 1, as an exciter drive unit that vibrates the diaphragm, in a magnetic circuit in which a magnetic gap is formed by a yoke or a magnet so as to sandwich a voice coil, the entire drive unit becomes large and lightweight. There is a problem that it becomes an obstacle to downsizing and downsizing.

Further, as in the invention described in Patent Document 2, even if the magnetic circuit is reduced in weight and size without forming a magnetic gap, as long as the magnet is arranged so as to face the voice coil surface, the magnetic flux Both will be brought closer in terms of efficiency.
As a result, there is a problem that the coil surface is damaged by the magnet due to the rolling phenomenon.

  Further, as in the invention of Patent Document 2, if a yoke or the like made of a magnetic material is present in addition to a movable magnet, an attractive force acts between the magnet and the magnetic material, making assembly work difficult. There's a problem.

  Furthermore, if the response to the heat radiation from the voice coil is insufficient, there is a problem that the coil collapses or is damaged.

The present invention has been made in view of such problems, and provides an exciter that is lightweight and downsized, eliminates damage to the voice coil surface, and is easily assembled, and a flat speaker using the exciter. It is intended.

In order to achieve the above object, the invention according to claim 1 of the present invention provides:
Consists of a housing composed of a bottomed cylindrical body having a gap opening at the top, and a coupler that is arranged to move up and down within the gap of the housing,
In the gap of the housing, two voice coils connected in series to the outer periphery are fixed to a voice coil bobbin provided with a required interval in the vibration direction so as to be in opposite phase to each other,
The coupler has a cylindrical first body portion which is provided at the center of the rear surface and is mounted on the center portion of the first damper whose outer peripheral portion is fixed to the upper portion of the housing. A second barrel having a smaller diameter than the first barrel, on which the magnetized magnet is mounted, and the center of the second damper whose outer peripheral portion is fixed on the inner bottom surface of the housing at the tip surface of the second barrel A third body part having a smaller diameter than the second body part to which the part is mounted, and
The magnet mounted on the second body by the first damper and the second damper is positioned between the two voice coils when the voice coil is not energized, and the direction in which the audio current flows when energized. The exciter is characterized in that the exciter is supported so as to move up and down in the gap so as to rise or fall according to the above .

The invention according to claim 2 of the present invention is
The exciter according to claim 1,
The gap in the housing is
The inner diameter is slightly larger than the outer diameter of the voice coil bobbin.

The invention according to claim 3 of the present invention is
The exciter according to claim 1,
The housing is
A slit portion for drawing out the lead wire of the voice coil to the outside of the housing is formed.

The invention according to claim 4 of the present invention is
The exciter according to claim 1,
The housing is
A plurality of adhesive filling ports having a predetermined depth are formed along the upper opening.

The invention according to claim 5 of the present invention is
In the exciter in any one of Claims 1-3 ,
The voice coil is
The surface is covered with an adhesive.

Furthermore, the invention according to claim 6 of the present invention is
An exciter according to any one of claims 1 to 5 is attached to a back surface portion of a planar diaphragm.

The exciter of the present invention is composed of a housing having a bottomed cylindrical body having a gap opening at the top, and a coupler that can be moved up and down in the gap of the housing. A voice coil bobbin having a coil is disposed in the gap,
In addition, a coupler having a magnet magnetized in the thickness direction fixed to a body portion thereof is placed between the two voice coils by the first damper and the second damper when the magnet is not energized to the voice coil. The members are arranged on the same axis without using a dedicated jig by means of being supported so as to move up and down in the gap so that it rises or falls according to the direction of the sound current when energized. Can be assembled.

In addition, the two voice coils are arranged with a predetermined interval in the vibration direction and in opposite phases to each other, and the voice coils are connected in series and fixed in the housing, and are arranged in the vibration direction. Since the magnet magnetized in the thickness direction is movably arranged in the substantially middle part of the voice coil, the magnet is mounted according to the flow direction of the voice current flowing through each voice coil. The movable body is moved between the two voice coils, and the movement of the magnet is transmitted to the vibrating body through an assembly such as a coupler to drive and vibrate the vibrating body.

  In particular, in the present invention, when two voice coils are arranged in the vibration direction with a required interval, the voice coils are made to have opposite phases to each other, and the voice coils are connected in series, Since the magnet is mounted on the inner side so as to be movable up and down, members other than the movable magnet are eliminated, so that the whole can be made smaller and lighter and easier to assemble.

  Further, since the magnet is magnetized in the thickness direction, that is, the N pole at the top and the S pole at the bottom, the magnetic poles of the voice coils connected in series so as to be in opposite phases to each other When the audio current is passed so that S-NNS in the vibration direction, the magnet moves to the upper side of the vibration direction, and when the current direction is reversed, the magnet moves to the lower side of the vibration direction. By repeating such an operation, an exciter with a simple configuration can be obtained.

  At that time, the voice coil is mounted on the outside of the cylindrical cylindrical body constituting the voice coil bobbin so as to be in opposite phases to each other in a groove formed at an interval, and inside the voice coil bobbin. By providing the magnet to be movable up and down, the magnet can be moved without damaging the voice coil.

  In addition, when the voice coil is mounted on the voice coil bobbin, the surface of the voice coil is covered with an adhesive to absorb the heat radiation from the voice coil during driving with the adhesive, and the voice coil collapses or resists due to temperature rise. It is possible to prevent a rise in value and obtain a stable sound pressure.

In the present invention, the magnet moving inside the two voice coils is fixed to a coupler movably mounted in the housing, and the coupler is movably supported by the two dampers. The response of the coupler to the vibration of the magnet due to the sound current from the can be improved, and the reproduction frequency band at high frequencies can be expanded.
Moreover, the weight of the exciter can be further reduced by molding the coupler with resin.

  In addition, a coupler that is movably held in the housing is configured so that one end of two dampers that support the coupler in the housing and a magnet can be fixed. The exciter can be easily assembled without using a dedicated jig such as a positioning jig.

In addition, by providing a slit having a predetermined depth for pulling out the lead wire of the voice coil to the housing holding the exciter made of the voice coil and magnet, wiring of the voice coil is facilitated. The coil wire that becomes the voice coil can be used as a lead wire as it is.
Moreover, since the wiring does not appear to the outside, the possibility of disconnection or the like can be eliminated.

Further, by forming an adhesive filling port having a predetermined depth into which the adhesive is poured, specifically, the entire length of the voice coil bobbin, along the peripheral edge of the opening of the gap formed in the housing. By pouring the adhesive from the adhesive filling port, the voice coil bobbin can be securely fixed to the housing, and the operation of covering the voice coil surface with the adhesive can be easily performed, and the voice coil bobbin is securely fixed in the housing. be able to.

Embodiments of an exciter according to the present invention and a speaker using the exciter will be specifically described below with reference to the accompanying drawings.
The present invention is not limited to the illustrated embodiment, and the two voice coils are arranged in the vibration direction so as to be in opposite phases with a required interval, and the voice coils are connected in series. In the present invention, a magnet is movably disposed between the two voice coils, and the magnet is moved in the vibration direction of the voice coil by changing the magnetic pole of the voice coil by the audio current flowing through the voice coil. Various changes can be made without departing from the scope of the gist.

As shown in FIGS. 1 to 3 and 5, an exciter 1 according to the present invention basically includes a housing 2 formed of a bottomed cylindrical body having a gap portion 3 having an open top, and the housing. A coupler 10 that is supported by two dampers 17 and 18 in a vertically movable manner, a magnet 7 fixed to the coupler 10, and two voice coils 4 fixed in the housing 2. , 5 and a voice coil bobbin 6 .
The two voice coils 4 and 5 are basically made of the same material and have the same diameter.

The housing 2 is obtained by integral molding of a synthetic resin, and the inner diameter of the gap 3 varies depending on the use of the exciter.
Further, although there is no particular limitation on the shape thereof, a vibrating body that is supported via a coupler, which will be described later, by forming a flange 2a having a required width extending outward at the opening of the gap portion 3. Can be held more reliably.

Further, as shown in FIG. 1, the upper surface portion of the housing 2 has a predetermined depth along the opening edge of the gap portion 3, specifically, the two voice coils 4 and 5 in the vibration direction. in that is formed with a plurality of adhesive filling port 8, 8 having the same depth as the total length of the voice coil bobbin 6 to be described later and holding the presence of required intervals.
Further, a slit portion 9 reaching from the opening edge of the gap portion 3 to the outer peripheral surface of the housing 2 is formed in a part thereof, and the lead wires 4a and 5a of the voice coils 4 and 5 are passed through the slit portion 9. It is configured so that it can be easily pulled out.

As shown in FIG. 4, the two voice coils 4 and 5 are spaced apart from each other in the vibration direction of the voice coil, and the voice coils 4 and 5 are out of phase with each other. The coils 4 and 5 are arranged so that the magnetic poles are the same, and the voice coils 4 and 5 are connected in series to increase the magnetic flux at the midpoint of the connection coil, thereby reducing the weight of the exciter attached to the vibrating body. Is.
Note that the two voice coils 4 and 5 configured in this way are both used by being fixed in the housing 2.

Therefore, when a magnet 7 magnetized in the thickness direction is movably arranged in the vertical direction inside the voice coils 4 and 5 and a voice current is passed from the voice coil 4 to the voice coil 5, the voice coil 4 The magnetic pole 5 becomes S-N-N-S, and the magnet 7 moves upward.
On the other hand, when a voice current is passed from the voice coil 5 to the voice coil 4, the magnetic poles of the voice coils 5 and 4 become NSSN and the magnet 7 moves downward. By repeating this operation, the magnet 7 moves up and down between the voice coils 4 and 5.

Specifically, as shown in FIG. 5, the voice coils 4 and 5 have outer circumferences of the voice coil bobbin 6 made of a cylindrical body whose outer diameter is slightly smaller than the inner diameter of the gap portion 3 of the housing 2. It is used by being mounted in concave grooves 6a and 6b formed with a required interval in the part.

  The magnet 7 is ring-shaped, and as is apparent from FIG. 5, the voice coil 4 is fixed to the coupler 10 disposed in the gap 3 of the housing 2 and disposed in the vibration direction. It is comprised so that it may move up and down inside 5 side.

That is, the coupler 10 includes, for example, a disk-shaped substrate 11 on which a thin vibration body such as a liquid crystal panel or a thin vibration plate such as a flat vibration plate is mounted, and a stepped portion at the center of the back surface of the substrate 11. A cylindrical first body portion 13 for attaching a first damper 17 formed through 12 and a magnet 7 connected to the first body portion 13 via a step portion 14 are attached. The second body part 15 having a small diameter and the third body part 16 having a small diameter for mounting the second damper 18 formed in the center of the front end surface of the second body part 15 are formed. Is.
In addition, each said part is integrally molded with a synthetic resin.

Further , when forming the third body portion, as shown in FIG. 5, a recess 20 is formed in the center of the tip surface of the second body 15, and the third body having a small diameter is formed in the center of the recess 20. By forming the protrusion 16 in a projecting manner, the concave portion 20 can be securely fixed to the inner peripheral portion of the second damper 18, which is a preferable mode.

  The first damper 17 is provided with a mounting portion 17b vertically attached to the housing 2 below the outer peripheral edge of the damper main body 17a whose outer diameter is substantially equal to the outer diameter of the flange 2a of the housing 2. The main body 17a is formed with a through hole 17c having a diameter substantially equal to the outer diameter of the first body portion of the coupler 10.

When the through hole 17c of the first damper 17 is fixed to the coupler 10 and the coupler 10 is held movably in the vertical direction in the gap 3 of the housing 2 , the damper 17 is given elasticity, In order to further increase the movable range of the coupler 10, it is preferable to bulge upward the inner portion of the flat outer peripheral portion as shown in FIG.

  Further, the second damper 18 forms a flat surface 18b in contact with the inner bottom surface 3a of the gap portion 3 of the housing 2 on the outer periphery of the damper main body 18a, and bulges the portion other than the flat surface 18b upward. The protrusion 18d is integrally formed with a through hole 18c that contacts the outer periphery of the third body 16 of the coupler 10 at the center.

  The outer diameter of the second damper 18 including the flat surface 18b is slightly smaller than the inner diameter of the inner bottom surface 3a of the gap 3 in the housing 2, and the inner diameter of the through hole 18c formed in the protruding portion 18d. Is substantially equal to the outer diameter of the third body 16 of the coupler 10.

  In the exciter 1 of the present invention, in order to reduce the weight, a magnetic body is used as a yoke that constitutes a magnetic circuit other than the magnet 7 that vibrates by moving up and down in the gap 3 of the housing 2. Not.

  In order to manufacture the exciter 1 using each of these members, first, the through hole 17c of the first damper 17 is fitted into the first body portion 13 constituting the coupler 10, and the flat peripheral edge of the through hole 17c is formed. The portion 17d is fixed to the step portion 12 of the coupler 10 with an adhesive.

Next, the through-hole 7a of the magnet 7 is fitted into the second body 15 of the coupler 10, and the upper flat surface 7b of the magnet 7 is fixed to the step 14 of the coupler 10 with an adhesive.
The unit assembled in this way is referred to as an upper unit.

On the other hand, the second damper 18 is fitted into the gap 3 of the housing 2, and the flat surface 18 b of the outer peripheral portion is fixed to the inner bottom surface 3 a of the gap 3 with an adhesive .
Next , from above, the voice coil bobbin 6 is inserted into the gap 3 with the held voice coils 4 and 5 positioned outside, and the bottom surface of the voice coil bobbin 6 is placed on the flat surface of the second damper 18. It fixes with the adhesive agent on 18b.
That is, the flat portion 18 b of the second damper 17 is fixed with an adhesive so as to be sandwiched between the bottom surface of the housing 4 and the bottom portion of the voice coil bobbin 6.
At this time, the lead wires 4 a and 5 a of the voice coils 4 and 5 are accommodated in a slit portion 9 provided in the housing 2.

Next, the adhesive B is injected into the adhesive filling port 8 provided on the upper surface of the housing 2, and the voice coil bobbin 6 is fixed to the inner peripheral surface of the housing 2 by the adhesive B, and each of the voice coils 4, 5 is fixed. The surface of is covered with adhesive B.
The unit assembled in this way is referred to as a lower unit.

As the adhesive that covers the surfaces of the voice coils 4 and 5, a highly heat-resistant adhesive that can withstand heat radiation from the voice coil is preferable.
Further, since the adhesive absorbs heat from the voice coil, it is possible to prevent the voice coil from collapsing and the resistance value from increasing due to temperature rise, and to obtain a stable sound pressure.

  As a final process of assembly, the upper unit and the lower unit are combined. At that time, the third body portion 16 of the upper unit having an adhesive applied to the periphery is formed in a through hole 18c formed in the second damper 18 of the lower unit. After fitting, the mounting portion 17b formed on the first damper 17 in the upper unit is fitted to the outermost peripheral surface of the housing 2 of the lower unit, that is, the outer peripheral portion of the flange 2a, and both are fixed with an adhesive. To do.

  By assembling the exciter 1 in this manner, the parts can be assembled and assembled on the same axis, and the magnet 7 is disposed in the voice coil bobbin 6 between the two voice coils 4 and 5. The exciter 1 can be easily made without preparing a dedicated jig.

  In addition, when the exciter 1 is assembled, in other words, when the exciter 1 is not driven, the magnet 7 is located in the middle of the voice coils 4 and 5 as is apparent from FIG.

Since the exciter 1 having such a configuration is magnetized in the thickness direction so that the upper part of the magnet 7 has an N pole and the lower part has an S pole as described above, the magnetic poles of the two voice coils 4 and 5 vibrate. When the voice current flows so as to be S-N-N-S in the direction, since the voice coils 4 and 5 are both fixed to the housing 2, the magnet 7 rises to the top in the vibration direction, The integral coupler 10 is also raised.
In addition, when the current direction is reversed, the magnetic poles of the voice coils 4 and 5 are also reversed like NSSS, and the magnet 7 moves downward in the vibration direction, so that the coupler 10 is also lowered.
By repeating such an operation, the magnet 7 moves up and down in the gap 3 and vibrates. Therefore, by attaching a diaphragm as a vibrating body to the substrate 11 of the coupler 10, the exciter 1 is connected to the speaker. It can be a driving body.
Furthermore, if a vibrating body on which an advertisement or the like is printed and displayed is mounted on the surface of the substrate 11, the vibrating body can be used as a moving display body.

  In addition, in the configuration of each member described above, two members are fixed by providing, on one side or both sides of the opposing member, a recess that is not shown but serving as an adhesive reservoir, and filling the recess with an adhesive. Can also increase the adhesive strength.

6 and 7 show a planar speaker 20 using the exciter 1 having the above-described configuration. Two exciters 1 and 1 are arranged and fixed in parallel in a rectangular speaker frame 21, and the rectangular shape is shown. The diaphragm 22 is joined to the edge 23, the outer peripheral side edge of the edge 23 is fixed to the speaker frame 21 by the holding plate 24, and the back surface of the diaphragm 22 is joined to the upper surface of the substrate 11 of each exciter 1, 1. The flat speaker 20 is bonded.
Therefore, if a voice current is passed through the voice coils of the exciters 1 and 1 at regular intervals in the forward and reverse directions, the vibration of the magnet is transmitted to the diaphragm 22 via the exciter, and functions as a flat speaker. be able to.

In the exciter according to the present invention, two voice coils that are spaced apart from each other in the vibration direction and arranged in opposite phases are connected in series and magnetized in the thickness direction inside the two voice coils. The magnet is provided so as to be movable in the vibration direction.
Therefore, by taking out the movement (vibration) of the magnet to the outside through an assembly such as a coupler, the vibration can be used effectively. Therefore, its use is not limited to a speaker, and an advertising medium that produces sound. Furthermore, by using a diaphragm with a large surface area, it can be used in a wide range of fields such as use as a sound collecting microphone.

It is a partially notched top view which shows an example of the exciter concerning this invention. FIG. 2 is a half-sectional view of the exciter shown in FIG. 1 when not driven. FIG. 2 is a half-sectional view when the exciter shown in FIG. 1 is driven. It is a schematic explanatory drawing which shows the voice coil of the exciter shown in FIG. It is a schematic explanatory drawing which shows an example of a structure of the exciter shown in FIG. It is a top view which shows an example of the planar speaker using the exciter concerning this invention. It is sectional drawing along ZZ in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Exciter 2 Housing 2a Flange 3 Space | gap part 4,5 Voice coil 4a, 5a Voice coil lead wire 6 Voice coil bobbin 6a, 6b Groove 7 Magnet 7a Magnet through-hole 8 Adhesive filling port 9 Slit part 10 Coupler 11 Substrate 12, 14 steps 13 first body 15 second body 16 third body 17 first damper 18 second damper 20 planar speaker 21 speaker frame 22 diaphragm 23 edge 24 holding plate

Claims (6)

Consists of a housing composed of a bottomed cylindrical body having a gap opening at the top, and a coupler that is arranged to move up and down within the gap of the housing,
In the gap of the housing, two voice coils connected in series to the outer periphery are fixed to a voice coil bobbin provided with a required interval in the vibration direction so as to be in opposite phase to each other,
The coupler has a cylindrical first body portion which is provided at the center of the rear surface and is mounted on the center portion of the first damper whose outer peripheral portion is fixed to the upper portion of the housing. A second barrel having a smaller diameter than the first barrel, on which the magnetized magnet is mounted, and the center of the second damper whose outer peripheral portion is fixed on the inner bottom surface of the housing at the tip surface of the second barrel A third body part having a smaller diameter than the second body part to which the part is mounted, and
The magnet mounted on the second body by the first damper and the second damper is positioned between the two voice coils when the voice coil is not energized, and the direction in which the audio current flows when energized. An exciter, wherein the exciter is supported so as to move up and down in the gap so as to rise or fall in response to the movement . The gap in the housing is
The exciter according to claim 1, wherein the inner diameter is slightly larger than the outer diameter of the voice coil bobbin. The housing is
The exciter according to claim 1, wherein a slit portion for pulling out the lead wire of the voice coil to the outside of the housing is formed. The housing is
The exciter according to claim 1, wherein a plurality of adhesive filling ports having a predetermined depth are formed along the upper opening. The voice coil is
The exciter according to any one of claims 1 to 3 , wherein the surface is covered with an adhesive. A flat speaker, wherein the exciter according to any one of claims 1 to 5 is attached to a back surface portion of a flat diaphragm.