JP2006100879A - Ring type speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ring type speaker capable of establishing compatibility between improvement of acoustic characteristics such as a frequency characteristic and a directivity characteristic including suppression of unwanted vibration and an abnormal sound and easiness of assembling or reduction of the number of parts and the number of steps. <P>SOLUTION: This ring type speaker is provided with a magnetic circuit, a voice coil arranged in a magnetic gap of the magnetic circuit, a circular ring diaphragm to which the voice coil is coupled; a shell-like equalizer arranged on the internal periphery of the ring diaphragm; a circular equalizer arranged on the external periphery of the ring diaphragm, and a plate-like coupling arm provided so as to extend in a plurality of radial directions to couple the shell-like equalizer and the circular equalizer. In this speaker, the coupling arm is provided with a first ridgeline represented by an arc crossing the head top end of the shell-like equalizer in a cross-sectional shape in the radial directions, a second ridgeline represented by an arc crossing the bottom surface end of the shell-like equalizer in the cross-sectional shape in the radial directions, and a plate-like portion for coupling the first ridgeline to the second ridgeline. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a ring type speaker including an annular ring diaphragm.

  Some conventional ring-type speakers have an equalizer, a horn, or the like attached to the front surface of an annular ring diaphragm in order to improve acoustic characteristics such as frequency characteristics and directivity characteristics. Ring-type speakers equipped with an annular ring diaphragm are often used as tweeters for high frequencies. The ring diaphragm is fixed and supported on the inner circumference, and a bullet-shaped equalizer with a size comparable to the outer diameter of the ring diaphragm is placed on the inner circumference of the ring diaphragm to improve acoustic characteristics in the high sound range. (Patent Document 1).

Further, when a bullet-shaped equalizer is arranged, there is a device that also serves as a member that fixes and supports the inner periphery of an annular ring diaphragm (Patent Document 2). In addition, when installing a bullet-shaped equalizer, there are ones that connect a ring-shaped equalizer or horn and a bullet-shaped equalizer to easily improve the assembly of a ring type speaker, and others that reduce the number of parts and man-hours (patents) Reference 3).

Japanese Utility Model Publication No. 57-158285 (Fig. 2) Japanese Utility Model Publication No. 57-69390 (Fig. 2) Japanese Utility Model Publication No. 56-11582 (Fig. 2)

  However, in the conventional ring speaker, it is difficult to achieve both improvement in acoustic characteristics and ease of assembly and reduction in the number of parts and man-hours. Specifically, acoustic characteristics and ease of assembly are influenced by each other due to the configuration of a bullet-like equalizer and an annular equalizer arranged on the front surface of the annular ring diaphragm. For example, when connecting a bullet-like equalizer and an annular equalizer, the number of parts and assembly man-hours can be reduced, but if the connecting part is made thin and small and weakened structurally, unnecessary vibrations are excited, and abnormal noise caused by vibrations is generated. On the other hand, if the connecting part is made thicker and stronger and structurally stronger, the effect on the acoustic characteristics increases, for example, the directional characteristics become narrower, or the sound quality deteriorates. there were.

  The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention relates to a ring-type speaker, and is characterized by acoustic characteristics such as frequency characteristics including unwanted vibration and noise suppression, and directivity characteristics. It is an object of the present invention to provide a ring type speaker that can achieve both improvement in ease of assembly and reduction in the number of parts and man-hours.

  The ring type speaker of the present invention includes a magnetic circuit, a voice coil arranged in a magnetic gap of the magnetic circuit, an annular ring diaphragm connected to the voice coil, and a bullet-like shape arranged on the inner periphery of the ring diaphragm. A ring speaker comprising: an equalizer; an annular equalizer disposed on the outer periphery of the ring diaphragm; and a plurality of radially extending plate-like connecting arms that connect the bullet-like equalizer and the annular equalizer; A connecting arm has a first ridge line represented by an arc passing through the top end of the bullet-like equalizer in a radial cross-sectional shape, and a second ridge line represented by an arc passing through the bottom end of the bullet-like equalizer in a radial cross-sectional shape. And a plate-like portion connecting the first ridge line and the second ridge line.

  Preferably, in the ring-type speaker of the present invention, the connecting arm has a first circular arc whose cross-sectional shape in the circumferential direction represents a first ridge line, and a second circular arc that represents a second ridge line having a radius equal to or larger than the radius of the first arc. And a curve representing a plate-like part.

  Preferably, in the ring-type speaker of the present invention, the radius of the first arc increases as the connecting arm reaches from the bullet-shaped equalizer to the annular equalizer in the cross-sectional shape in the circumferential direction.

  More preferably, the ring-type speaker of the present invention has, in a radial cross-sectional shape, a curve defining a cross-sectional shape from the top end to the bottom end of the bullet-like equalizer, and a cross-sectional shape from the top end to the bottom end of the annular equalizer. Are defined by arcs having the same radius, and the direction of the center line defined from the center point of these two arcs is different from the vibration direction of the voice coil.

  More preferably, in the ring type speaker of the present invention, a bullet-shaped equalizer and a connection arm having a connection hole formed at one end are integrally molded with resin, and an annular equalizer is connected to the connection hole of the connection arm. A hole is provided, and the bottom of the bullet-shaped equalizer and the magnetic circuit are sandwiched between the inner periphery of the ring diaphragm by fastening the screw that connects each of the connecting arm and the annular equalizer to the screw hole of the magnetic circuit. The outer periphery of the ring diaphragm is sandwiched between the lower surface of the annular equalizer and the magnetic circuit, and a voice coil connected to the ring diaphragm is disposed in the magnetic gap of the magnetic circuit.

  More preferably, the ring-type speaker of the present invention includes a bullet-shaped equalizer, a connection arm, and a connection equalizer in which a ring equalizer is integrally molded with a resin, and a screw hole corresponding to the connection hole of the magnetic circuit. By tightening the screw that penetrates the connection hole into the screw hole of the connection equalizer, the inner periphery of the ring diaphragm is sandwiched between the bottom surface of the bullet-like equalizer and the magnetic circuit, and the outer periphery of the ring diaphragm is connected to the lower surface of the annular equalizer and the magnetic circuit. A voice coil sandwiched and connected to the ring diaphragm is arranged in the magnetic gap of the magnetic circuit.

  More preferably, in the ring type speaker according to the present invention, the magnetic circuit has a resin-molded inner periphery fixing support member for fixing and supporting the inner periphery of the ring diaphragm, and a resin molding for fixing and supporting the outer periphery of the ring diaphragm. An outer peripheral fixed support member, and the inner peripheral fixed support member and the outer peripheral fixed support member fix and support the inner periphery and the outer periphery of the ring diaphragm via the buffer member.

  The operation of the present invention will be described below.

  The ring-type speaker of the present invention includes an annular ring diaphragm, and a bullet-like equalizer is disposed on the inner periphery of the ring diaphragm, and an annular equalizer is disposed on the outer periphery of the ring diaphragm. Bullet-like equalizers and annular equalizers are provided to improve the acoustic characteristics such as the frequency characteristics and directivity characteristics of ring-type speakers, and to suppress unwanted vibrations and abnormal noises in these equalizers, and In order to facilitate assembly and reduce the number of parts and man-hours, a plurality of radially extending plate-like connecting arms for connecting the bullet-like equalizer and the annular equalizer are provided.

  Here, the plate-like connecting arm has the conditions described below from the viewpoint of vibration and sound. That is, the connecting arm of the present invention is represented by a first ridge line represented by an arc passing through the top end of the bullet-like equalizer in the radial cross-sectional shape and an arc passing through the bottom end of the bullet-like equalizer in the radial cross-sectional shape. Defined by the second ridge line and the plate-like portion connecting the first ridge line and the second ridge line. The plate-like connecting arm defined by the first ridge line and the second ridge line extends from the top end of the bullet-like equalizer to the bottom edge at the connection portion with the bullet-like equalizer, As it reaches the outer periphery, it becomes narrower and narrower continuously. Preferably, since the first ridge line and the second ridge line are represented by arcs having the same radius and different central positions, the radial cross-sectional shape of the plate-like connection arm reaches the connection portion with the annular equalizer. Continuously narrow and narrow. That is, the shape of the plate-like connecting arm changes smoothly in the radial direction, and no extreme change in shape occurs. As a result, the plurality of connecting arms are less likely to generate a unique vibration mode, the bullet-like equalizer can be firmly fixed, and the generation of abnormal noise due to unnecessary vibration can be reduced. And on the other hand, the influence which a plate-shaped connection arm has on acoustic characteristics, for example, directional characteristics, can also be reduced.

  Preferably, the plate-like connecting arm has a first circular arc whose cross-sectional shape in the circumferential direction represents the first ridge line, a second arc that represents the second ridge line having a radius equal to or larger than the radius of the first arc, and a plate-like shape. And a curve representing a part. More preferably, the radius of the first arc increases from the bullet-shaped equalizer to the annular equalizer. That is, the plate-like connecting arm is thinner as it approaches the top end of the bullet-like equalizer, and the thickness in the cross-sectional shape increases toward the outer peripheral side and closer to the ring diaphragm. Since the first ridge line and the second ridge line are circular arcs and do not constitute an acoustic unidirectional reflection surface, the influence on the acoustic characteristics can be reduced with the smooth shape change of the plate-like connecting arm. it can. In addition, since the direction of the draft angle in mold processing can be matched between the bullet-shaped equalizer and the connecting arm, the bullet-shaped equalizer can be used when molding the bullet-shaped equalizer and the plate-shaped connecting arm together. And the plate-like connecting arm can be firmly integrated.

  Furthermore, it is preferable that the bullet-shaped equalizer and the annular equalizer have the following relationship in the cross-sectional shape in the radial direction. In other words, a curve that defines the cross-sectional shape from the top end to the bottom surface end of the bullet-shaped equalizer and a curve that defines the cross-sectional shape from the top surface end to the bottom surface end of the annular equalizer are each defined by arcs of the same radius, In addition, the direction of the center line defined from the center point of these two arcs is different from the vibration direction of the voice coil. That is, the direction of the middle line is inclined from the inner peripheral side to the outer peripheral side in the radial direction. Therefore, the ring type speaker according to the present invention can realize a wider directivity even though it is provided with a cannonball-like and annular equalizer and further has a plate-like connecting arm.

  Preferably, the bullet-shaped equalizer is integrally molded with a connecting arm having a connecting hole formed at one end, and the annular equalizer includes a connecting hole corresponding to the connecting hole of the connecting arm. That is, the bullet-shaped equalizer and the connecting arm, which are integrally molded with resin, are connected to the annular equalizer and the magnetic circuit by the screw as the connecting member. The screw passes through the connecting hole of the connecting arm and the annular equalizer and is screwed into the screw hole of the magnetic circuit. As a result, the bottom surface of the bullet-like equalizer and the magnetic circuit sandwich the inner periphery of the ring diaphragm, and the bottom surface of the annular equalizer and the magnetic circuit sandwich the outer periphery of the ring diaphragm. The voice coil connected to the ring diaphragm is disposed in the magnetic gap of the magnetic circuit, and the inner and outer circumferences of the ring diaphragm are firmly fixed. Therefore, unnecessary vibration and abnormal noise can be suppressed, and at the same time, easy assembly and reduction of the number of parts and man-hours are realized.

  Preferably, the connection equalizer in which the bullet-shaped equalizer, the connection arm, and the annular equalizer are integrally molded with resin includes a screw hole corresponding to the connection hole of the magnetic circuit, and the connection member that connects the connection equalizer and the magnetic circuit is provided. The screw that is screwed into the screw hole, and by tightening the screw that penetrates the connecting hole into the screw hole, the inner periphery of the ring diaphragm is sandwiched between the bottom surface of the bullet-like equalizer and the magnetic circuit, and the outer periphery of the ring diaphragm is The lower surface of the annular equalizer and the magnetic circuit are sandwiched, and a voice coil connected to the ring diaphragm is disposed in the magnetic gap of the magnetic circuit. Therefore, the voice coil connected to the ring diaphragm is arranged in the magnetic gap of the magnetic circuit, and the inner and outer circumferences of the ring diaphragm are firmly fixed. Since the resin is integrally molded by the connecting arm, unnecessary vibration and abnormal noise can be suppressed, and at the same time, further assembly can be facilitated and the number of parts and man-hours can be reduced.

  More preferably, the magnetic circuit is a resin-molded inner peripheral fixed support member that fixes and supports the inner periphery of the ring diaphragm, and a resin-molded outer peripheral fixed support member that fixes and supports the outer periphery of the ring diaphragm; Is provided. The inner periphery fixing support member and the outer periphery fixing support member fix and support the inner periphery and the outer periphery of the ring diaphragm via the buffer member. For example, because the vibration generated by the ring diaphragm is absorbed by a cushioning member such as cotton woven fabric, foamed urethane, foamed rubber, felt, etc., it is difficult to propagate to the bottom of the bullet-shaped equalizer or the bottom of the annular equalizer. The speaker can reduce the generation of abnormal noise caused by unnecessary vibration.

  The ring type speaker of the present invention can improve the frequency characteristics including suppression of unnecessary vibrations and abnormal sounds and acoustic characteristics such as directivity, and further facilitates assembly and reduces the number of parts and man-hours. , Can be compatible.

  The ring type speaker of the present invention includes a magnetic circuit, a voice coil arranged in a magnetic gap of the magnetic circuit, an annular ring diaphragm connected to the voice coil, and a bullet-like shape arranged on the inner periphery of the ring diaphragm. An equalizer, an annular equalizer arranged on the outer periphery of the ring diaphragm, and a plurality of radially extending plate-like connecting arms connecting the bullet-like equalizer and the annular equalizer, the connecting arm being in the radial direction A first ridge line represented by an arc passing through the top end of the bullet-like equalizer in a cross-sectional shape of the first ridge line, a second ridge line represented by an arc passing through the bottom end of the bullet-like equalizer in a cross-sectional shape in the radial direction, This is realized by including a plate-like portion connecting the second ridge line.

  Hereinafter, although the ring-type speaker by preferable embodiment of this invention is demonstrated, this invention is not limited to these embodiment.

  1A and 1B are diagrams for explaining a ring type speaker 1 according to a preferred embodiment of the present invention. FIG. 1A is a front view, and FIG. It is sectional drawing of B-O-A. In addition, FIG. FIG. 2B is a partially enlarged cross-sectional view of B-O, and FIG. It is a partial expanded sectional view about OA. The ring type speaker 1 is a tweeter for high-frequency range reproduction provided with a ring diaphragm 2, and a bullet-like equalizer 11 is provided on the inner peripheral side of the ring diaphragm 2, and an annular equalizer 12 is provided on the outer peripheral side of the ring diaphragm 2. Be placed.

  The ring speaker 1 includes a magnetic circuit including a yoke 4, a plate 5, a main magnet 6, and a submagnet 7, and a ring diaphragm 2 is provided in a magnetic gap defined by the yoke 4 and the plate 5. Is arranged. When a current is applied to the voice coil 3, the ring diaphragm 2 vibrates and a sound wave is emitted. Specifically, the ring diaphragm 2 includes an inner periphery and an outer periphery that are fixedly supported using, for example, a synthetic fiber woven fabric laminated with a resin film such as acrylic or urethane as a base material. The ring-shaped diaphragm has a cross-sectional shape in which two convex rolls are connected to each other, and a bobbin around which a voice coil is wound is connected to a connection part of the roll in the center of the ring. The ring diaphragm 2 is fixedly supported at the inner periphery and the outer periphery by an inner periphery fixing support member 9 and an outer periphery fixing support member 10 which are resin-molded. Specifically, the inner periphery of the ring diaphragm 2 is sandwiched between the bottom surface of the bullet-shaped equalizer 11 and the inner peripheral fixed support member 9 via a cotton woven cloth (felt) 21 as a buffer member, and the outer periphery of the ring diaphragm 2 is The lower surface of the annular equalizer 12 and the outer periphery fixing support member 10 are sandwiched via a cotton woven fabric 22 as a buffer member.

  The yoke 4 has a through hole in the center, and this through hole defines a cavity together with the cover 8 of the magnetic circuit. The inner peripheral fixed support member 9 includes a through hole through which air on the inner peripheral back surface side of the ring diaphragm 2 vents through the yoke 4 and the cavity of the cover 8. The cover 8 of the magnetic circuit is preferably resin-molded into a strong shape having a thickness so as not to generate an excessive sound due to vibration generated in the magnetic circuit, and is attached to the outer peripheral portion of the under plate of the yoke 4 It is done.

  FIGS. 3A and 3B are diagrams illustrating the bullet-like equalizer 11. FIG. 3A is a front view, FIG. 3B is a side view, and FIG. 3C is a cross-section in the circumferential direction of the connecting arm in the side view. It is sectional drawing showing c1-c5. The bullet-shaped equalizer 11 includes a bullet-shaped shell portion 110 and four plate-like connecting arms 111 that are integrally molded with resin, and an end portion of the connecting arm 111 is screwed with an annular equalizer 12 and a magnetic field. A through hole 112 connected to the circuit plate 5 is provided. The bullet portion 110 has a bullet shape extending from the top end O to the bottom end C, and its cross-sectional shape is defined by a curve 113 partially shown in the partially enlarged cross-sectional view of FIG. The connecting arm 111 includes a first ridge line 114 whose radial cross-sectional shape is represented by an arc passing through the top end O of the bullet portion 110, and a first ridge line whose radial cross-sectional shape passes through the bottom end C of the bullet portion 110. It is defined by a second ridge line 115 represented by an arc having the same radius, and a plate-like portion 116 connecting the first ridge line 114 and the second ridge line 115.

  The shape of the plate-like connecting arm 111 changes smoothly in the radial direction. The plate-like connecting arm 111 extends from the top end O to the bottom end C of the cannonball portion 110 at a portion where it is connected to the cannonball portion 110, and on the other hand, the first connecting arm 111 extends from the inner periphery side to the outer periphery side. The cross-sectional shape in the radial direction defined by the ridge line 114 and the second ridge line 115 is continuously narrowed. The first ridge line 114 and the second ridge line 115 are represented by arcs having the same radius ra and having different center positions. As is clear from the cross-sectional view, the cross-sectional shape in the radial direction increases toward the connecting portion with the annular equalizer 12. Continuously narrows. Each of the plurality of connecting arms has a first ridge line that coincides with the top end O of the shell portion 110.

  Further, the plate-like connecting arm 111 has a circumferential cross-sectional shape of a first arc 117 representing the first ridge line 114 and a first arc as shown in the cross-sectional views c1 to c5 of FIG. It is defined from a second arc 118 representing the second ridge line 115 having a radius rd equal to or greater than the radius rc, and curves 119 and 120 representing the plate-like portion 116. The curve 119 or the curve 120 is a curve that connects one end of the first arc 117 and one end of the second arc 118, may be an arc, and includes a straight line. In addition, the connection arm 111 has a radius rc of the first arc 117 that increases from the bullet portion 110 to the connection hole 112. Since the radius rd of the second arc 118 is greater than or equal to the radius rc of the first arc 117, the plate-like connecting arm 111 is thinner toward the top end O of the bullet portion 110, on the outer peripheral side, and on the ring side. The closer to the diaphragm 2, the greater the thickness in the cross-sectional shape. The cross-sectional shape in the circumferential direction of the connecting arm 111 may have the above relationship within the range of the inner periphery and the outer periphery of the ring diaphragm 2 in the radial direction, that is, in the front direction of the vibration part of the ring diaphragm 2. .

  The radius rc of the first arc 117 and the radius rd of the second arc 118 do not need to be extremely large, and may be a dimensional difference that defines the direction of the draft in the die machining. The draft angle coincides with the draft angle direction of the shell 110, and the separation line (parting line) between the upper mold and the lower mold of the mold is close to the bottom of the bullet equalizer 11 and the connecting arm 111. The manufacturing cost of the bullet-shaped equalizer 11 and the connecting arm 111 that are integrally molded can be reduced.

  The plurality of connecting arms 111 are resin-molded integrally with the cannonball portion 110 to constitute a cannonball equalizer 11. If the through-hole 112 of the bullet-shaped equalizer 11, the annular equalizer 12, and the plate 5 of the magnetic circuit are connected by the screw 13, the bullet-shaped equalizer 11 can be firmly fixed. At this time, since the inner periphery and the outer periphery of the ring diaphragm 2 are fixedly supported at the same time, the assembly of the ring speaker 1 is completed. The bullet-like equalizer 11 and the annular equalizer 12 are firmly connected by the plurality of connecting arms 111, and the generation of abnormal noise due to unnecessary vibration of the equalizer exposed on the surface of the ring speaker 1 can be reduced.

  FIG. 4 is a diagram for explaining the vibration characteristics of the bullet-like equalizer 11. FIG. 4A is a front view of the ring type speaker 1, and FIG. 4B is a frequency characteristic diagram showing a vibration acceleration characteristic at a point X of the bullet-like equalizer 11. The characteristic indicated by the solid line (i) is an embodiment of the present invention, and is a case where the bullet-like equalizer 11 and the annular equalizer 12 are firmly connected by a plurality of connecting arms 111. Moreover, the characteristic of a broken line (ii) is a comparative example, and is a case where the connecting arm for connecting the bullet-shaped equalizer 11 and the annular equalizer 12 is not provided. By providing the plate-like connecting arm 111 as in the embodiment of the present invention in almost all the bands except for a part, the vibration acceleration at the point X of the bullet-like equalizer 11 becomes low. Therefore, it is possible to reduce abnormal noise caused by unnecessary vibration of the equalizer, and a ring type speaker with improved sound quality is realized.

  In a preferred embodiment, the inner periphery of the ring diaphragm 2 is sandwiched between the bottom surface of the bullet-shaped equalizer 11 and the inner periphery fixing support member 9 via the buffer member 21, and the outer periphery of the ring diaphragm 2 is inserted into the buffer member 22. The lower surface of the annular equalizer 12 and the outer periphery fixing support member 10 are sandwiched between the two. In the embodiment of the present invention, a cotton woven fabric (felt) is used as the cushioning member. However, urethane foam may be preferable, and foamed rubber may be used. The ring speaker 1 can reduce the generation of abnormal noise caused by unnecessary vibration.

  On the other hand, the ring type speaker 1 can minimize the influence of the plate-like connecting arm 111 on the acoustic characteristics, for example, the directivity. The shape of the cross section in the circumferential direction of the connecting arm 111 is defined by arcs represented by the first arc 117 and the second arc 118, and does not constitute an acoustic unidirectional reflection surface. Further, the shape of the cross section in the radial direction of the plate-like connecting arm 111 changes smoothly. Along with the smooth shape change, the volume per unit length in the radial direction of the plate-like connecting arm 111 gradually decreases from the inner peripheral side to the outer peripheral side. Therefore, even when the angle of the measurement direction in the directional characteristic is wide, the influence of the connecting arm 111 on the acoustic characteristic is reduced. For example, the directional characteristic can be widened, or deterioration of sound quality is prevented.

  In the present embodiment, the annular equalizer 12 is lower in height than the bullet-like equalizer 11, in other words, the thickness from the upper surface end to the lower surface end of the annular equalizer 12 is thin. A curve 123 that defines the cross-sectional shape from the upper surface end to the lower surface end of the annular equalizer 12 is defined by an arc having the same radius rb as the curve 113 that defines the cross-sectional shape from the top end O to the bottom end C of the shell portion 110. The 2A and 2B are partial enlarged cross-sectional views, the center point of the arc 123 and the center point of the arc 113 are not described, and are defined from the center points of these two arcs. The middle line L is a perpendicular bisector connecting the center point of the arc 123 and the center point of the arc 113. The direction of the center line L is different from the vibration direction of the voice coil 3 whose direction is equal to the vertical axis direction Z. As a result, the direction of the center line L is inclined from the inner peripheral side to the outer peripheral side in the radial direction. Note that the curve 113 and the curve 123 may be circular arcs having the same radius within a range in which the mutual relationship is axisymmetric with respect to the midline L.

  FIG. 5 is a diagram for explaining the directivity characteristics of the ring speaker 1. FIG. 5A shows the directivity pattern of the ring type speaker 1 having the connection arm 111 of the first embodiment, and FIG. 5B does not have the connection arm of the comparative example. When the curve 113 that defines the cross-sectional shape from the top end O to the bottom surface end C of the bullet portion 110 and the curve 121 that defines the cross-sectional shape from the top surface end to the bottom surface end of the annular equalizer 12 are axisymmetric. It is a directivity pattern of a ring type speaker. The frequency is common at 19.95 kHz. In the comparative example, a deep dip is generated between the directional beams generated in the front 0 ° direction and the approximately 45 ° direction (approximately 30 ° direction). Deep dip is not possible, and wide directivity is realized. Therefore, the ring type speaker 1 of the present invention can realize a wider directional characteristic even though the bullet-like equalizer 11 and the annular equalizer 12 are provided, and the plate-like connecting arm 111 is provided.

  At the same time, the ring type speaker 1 of the present embodiment can be easily assembled and the number of parts and man-hours can be reduced. Since the bullet-shaped equalizer 11 and the connecting arm 111 are integrated, in addition, the ring diaphragm 2 is fixedly supported at the inner periphery and the outer periphery by the resin-molded inner periphery fixed support member 9 and the outer periphery fixed support member 10. In assembling the ring type speaker 1, the ring diaphragm 2 can be fixed by connecting the screw 13, and no adhesive is used. Even when the voice coil 3 is disconnected, repair is almost impossible if an adhesive is used. However, the ring diaphragm 2 and the voice coil 3, the inner peripheral fixed support member 9 or the outer peripheral fixed support member 10 as required. There is an advantage that only need to be replaced.

  Furthermore, in order to facilitate assembly, the bullet-shaped equalizer 11 and the inner peripheral fixed support member 9 may be provided with a shaft portion 121 and a bearing portion 91 that are fitted to each other. Further, if a through-hole corresponding to the shaft portion 121 or the bearing portion 91 is provided in the inner peripheral portion of the ring diaphragm 2, the shaft portion 121 of the bullet-shaped equalizer 11 or the inner periphery is fixed when the ring type speaker 1 is assembled. The bearing 91 of the support member 9 serves as a guide, and the ring diaphragm 2 can be easily arranged. Therefore, the man-hour can be reduced.

In the present invention, the number of the connecting arms 111 is not limited to four. It is sufficient if the number is sufficient to firmly fix the bullet-shaped equalizer 11. Further, the bullet-shaped equalizer 11 and the connecting arm 111 are not limited to integral molding with resin. You may shape | mold integrally by inject | pouring metals, such as aluminum, into a casting_mold | template. The ring diaphragm 2 may be a plane diaphragm. Any ring diaphragm can be used as long as the inner and outer peripheries are fixed, and the shape of the diaphragm is not limited.

FIG. 6 is a diagram illustrating a ring type speaker 61 according to another preferred embodiment of the present invention. 6A is a front view, and FIG. It is sectional drawing of B-O-A. In FIG. 6, the description of the parts common to the first embodiment described in FIG. 1 is omitted.

The ring type speaker 61 is a tweeter for high-frequency range reproduction including the ring diaphragm 2, and a bullet-like equalizer 11 is provided on the inner peripheral side of the ring diaphragm 2, and an annular equalizer 12 is provided on the outer peripheral side of the ring diaphragm 2. Be placed. Here, the four plate-like connecting arms 111 are integrally molded with the bullet-shaped equalizer 11 and the annular equalizer 12 and connect the bullet-shaped equalizer 11 and the annular equalizer 12. That is, the connection equalizer 62 is formed by integrally molding the bullet-shaped equalizer, the connection arm and the annular equalizer with resin.

  The connection equalizer 62 includes a screw hole corresponding to the connection hole of the magnetic circuit on the bottom surface side of the bullet-like equalizer 11. One screw 63 connects the connection equalizer 62, the magnetic circuit, and the cover 8 of the magnetic circuit. Specifically, the magnetic circuit is an inner magnet type magnetic circuit composed of a yoke 4, a plate 5 having a through hole on the inner peripheral side, and a magnet 6, and a resin is provided in the inner peripheral side through hole of the plate 5. The molded inner peripheral fixed support member 9 is attached to the outer peripheral portion of the yoke 4 and the outer peripheral fixed support member 10 is attached. The screw 63 passes through a bearing portion of the inner peripheral fixed support member 9 of the magnetic circuit and a connection hole provided in the cover 8 of the magnetic circuit and is screwed into a screw hole of the connection equalizer 62, so that the connection equalizer 62 and the magnetic circuit And the cover 8 of the magnetic circuit is fastened. The outer periphery fixing support member 10 also serves as a terminal board.

  As a result, the inner periphery of the ring diaphragm 2 is sandwiched by the inner periphery fixing support member 9 attached to the bottom surface of the bullet-like equalizer 11 and the magnetic circuit, and the outer periphery of the ring diaphragm 2 is attached to the lower surface of the annular equalizer 12 and the magnetic circuit. The outer peripheral fixed support member 10 is sandwiched and the voice coil 3 connected to the ring diaphragm 2 is disposed in the magnetic gap of the magnetic circuit. The voice coil 3 connected to the ring diaphragm 2 is disposed in the magnetic gap of the magnetic circuit, and the ring diaphragm 2 is firmly fixed at the inner periphery and outer periphery thereof.

  Since the ring-type speaker 61 includes the connection equalizer 62 in which the bullet-shaped equalizer 11 and the annular equalizer 12 are integrally molded by the connection arm 111, unnecessary vibration and abnormal noise are suppressed. Further, since only one screw 63 for connecting the connection equalizer 62 and the magnetic circuit is sufficient, further assembly can be facilitated and the number of parts and man-hours can be reduced. Of course, there may be a plurality of screws that connect the connecting equalizer 62 and the magnetic circuit.

  Further, in the connection equalizer 62 of the second embodiment, the height of the annular equalizer 12 is lower than the height of the bullet-like equalizer 11 in the radial cross-sectional shape. The height from the upper surface end to the lower surface end of the annular equalizer 12 may be lower than the height of the bullet-like equalizer 11, and may preferably be equal to the height of the bullet-like equalizer 11. A curve 123 that defines the cross-sectional shape from the top surface end to the bottom surface end of the annular equalizer 12 is defined by an arc having the same radius as the curve 113 that defines the cross-sectional shape from the top end O to the bottom end C of the shell 110. Furthermore, the direction of the center line L defined from the center point of these two arcs is different from the vibration direction Z of the voice coil 3, and as a result, the direction of the center line L is from the radially inner side. What is necessary is just to incline to the outer peripheral side. The ring type speaker of the present invention can realize a wide directional characteristic.

  The ring type speaker of the present invention is not limited to a tweeter for high-frequency range reproduction, but can be applied to a full-range speaker or other speakers for medium-low range reproduction. A bullet-shaped equalizer is disposed on the inner peripheral side of the ring diaphragm, and an annular equalizer is disposed on the outer peripheral side of the ring diaphragm, which is suitable for a speaker having a connecting arm for connecting these.

It is a figure explaining the ring type speaker by preferable embodiment of this invention. (Example 1) It is a figure explaining the ring type speaker by preferable embodiment of this invention. (Example 1) It is a figure explaining the bullet-shaped equalizer by preferable embodiment of this invention. (Example 1) It is a figure explaining the vibration characteristic of the bullet-shaped equalizer by preferable embodiment of this invention. (Example 1) It is a figure explaining the directional characteristic of the ring type speaker by preferable embodiment of this invention. (Example 1) It is a figure explaining the ring type speaker by other preferable embodiment of this invention. (Example 2)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ring type speaker 2 Ring diaphragm 3 Voice coil 4 Yoke 5 Plate 6 Main magnet 7 Sub magnet 8 Cover 9 Inner periphery fixed support member 91 Bearing part 10 Outer periphery fixed support member 11 Bullet-like equalizer 12 Annular equalizer 111 Connection arm 112 Through-hole 114 1st ridgeline 115 2nd ridgeline 116 Plate-shaped part 117 1st circular arc 118 2nd circular arc 121 Axis part 61 Ring type speaker 62 Connection equalizer

Claims (7)

A magnetic circuit; a voice coil disposed in a magnetic gap of the magnetic circuit; an annular ring diaphragm connected to the voice coil; a bullet-like equalizer disposed on an inner periphery of the ring diaphragm; and the ring A ring type speaker comprising: an annular equalizer disposed on the outer periphery of a diaphragm; and a plurality of radially extending plate-like connecting arms that connect the bullet-like equalizer and the annular equalizer;
The connecting arm is
A first ridge represented by an arc passing through the top end of the bullet-like equalizer in a radial cross-sectional shape;
A second ridge represented by an arc passing through the bottom end of the bullet-like equalizer in a radial cross-sectional shape;
A plate-like portion connecting the first ridge line and the second ridge line;
A ring-type speaker. The cross-sectional shape in the circumferential direction of the connecting arm is
Defined by a first arc representing the first ridgeline, a second arc representing the second ridgeline having a radius equal to or greater than the radius of the first arc, and a curve representing the plate-like portion.
The ring speaker according to claim 1. In the cross-sectional shape in the circumferential direction, the connecting arm,
From the bullet-shaped equalizer to the annular equalizer,
The radius of the first arc increases,
The ring type speaker according to claim 2. In the cross-sectional shape in the radial direction,
A curve that defines a cross-sectional shape from the top end to the bottom end of the bullet-shaped equalizer and a curve that defines a cross-sectional shape from the top end to the bottom end of the annular equalizer are each defined by arcs of the same radius, And,
The direction of the middle line defined from the center point of these two arcs is different from the vibration direction of the voice coil,
The ring type speaker according to any one of claims 1 to 3. The bullet-shaped equalizer and the connection arm having a connection hole formed at one end are integrally molded with resin; and
The annular equalizer includes a connection hole corresponding to the connection hole of the connection arm;
By fastening a screw that passes through each connecting hole and connects the connecting arm and the annular equalizer to a screw hole of the magnetic circuit,
The inner surface of the ring diaphragm is sandwiched between the bottom surface of the bullet-shaped equalizer and the magnetic circuit, and the outer periphery of the ring diaphragm is sandwiched between the bottom surface of the annular equalizer and the magnetic circuit, and the voice coil connected to the ring diaphragm is Arranged in the magnetic gap of the magnetic circuit,
The ring type speaker according to any one of claims 1 to 4. The connection equalizer in which the bullet-shaped equalizer, the connection arm, and the annular equalizer are integrally molded with resin includes a screw hole corresponding to the connection hole of the magnetic circuit,
By fastening a screw passing through the connecting hole of the magnetic circuit to the screw hole of the connecting equalizer,
The inner surface of the ring diaphragm is sandwiched between the bottom surface of the bullet-like equalizer and the magnetic circuit, and the outer periphery of the ring diaphragm is sandwiched between the bottom surface of the annular equalizer and the magnetic circuit, and the voice coil connected to the ring diaphragm is Arranged in the magnetic gap of the magnetic circuit,
The ring type speaker according to any one of claims 1 to 4. The magnetic circuit is
A resin-molded inner periphery fixing support member that fixes and supports the inner periphery of the ring diaphragm;
A resin-molded outer periphery fixing support member for fixing and supporting the outer periphery of the ring diaphragm;
With
The inner periphery fixing support member and the outer periphery fixing support member fixedly support the inner periphery and the outer periphery of the ring diaphragm via a buffer member;
The ring speaker according to claim 5 or 6.

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