WO2009082060A1 - Diaphragm of the electronic sounder and the electronic sound which has the diaphragm - Google Patents

Diaphragm of the electronic sounder and the electronic sound which has the diaphragm Download PDF

Info

Publication number
WO2009082060A1
WO2009082060A1 PCT/KR2008/001610 KR2008001610W WO2009082060A1 WO 2009082060 A1 WO2009082060 A1 WO 2009082060A1 KR 2008001610 W KR2008001610 W KR 2008001610W WO 2009082060 A1 WO2009082060 A1 WO 2009082060A1
Authority
WO
WIPO (PCT)
Prior art keywords
diaphragm
electric
acoustic transducer
central portion
magnetic circuit
Prior art date
Application number
PCT/KR2008/001610
Other languages
French (fr)
Inventor
Yoon Kyu Kang
Hyeon Cheol Park
Original Assignee
Yea Il Electronics Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yea Il Electronics Co., Ltd. filed Critical Yea Il Electronics Co., Ltd.
Priority to CN200880004862.4A priority Critical patent/CN101606396B/en
Publication of WO2009082060A1 publication Critical patent/WO2009082060A1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones
    • H04R7/14—Non-planar diaphragms or cones corrugated, pleated or ribbed
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R11/00—Transducers of moving-armature or moving-core type
    • H04R11/02—Loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/16—Mounting or tensioning of diaphragms or cones
    • H04R7/18—Mounting or tensioning of diaphragms or cones at the periphery
    • H04R7/22—Clamping rim of diaphragm or cone against seating
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/04—Construction, mounting, or centering of coil
    • H04R9/041—Centering
    • H04R9/043—Inner suspension or damper, e.g. spider
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2400/00—Loudspeakers
    • H04R2400/03—Transducers capable of generating both sound as well as tactile vibration, e.g. as used in cellular phones

Definitions

  • the present invention relates to a diaphragm for electric- acoustic transducers and an electric- acoustic transducer having the diaphragm.
  • electric-acoustic transducers are acoustic output devices, such as speakers, receivers, buzzers, and vibrators, which convert electric signals, input from signal sources, into mechanical signals to output sounds or generate vibrating force.
  • Earphones and speaker systems are representative examples of devices using such acoustic output devices.
  • a magnet and a top plate are placed on a yoke in positional sequence and are adhered or welded to the yoke.
  • a coil which is fastened to one surface of a diaphragm, is disposed in a gap defined in the magnet and the top plate. Therefore, a magnetic circuit, which includes the yoke, the magnet and the top plate, and/or the coil and the diaphragm vibrate in response to magnetic flux, generated in the gap, depending on the direction of alternating current signals applied to the coil, thus generating vibrating force and/or sounds.
  • FIG. 1 An example of an electric-acoustic transducer, which outputs sounds using the vibration of diaphragms and outputs vibrating force using the vibration of magnetic circuits, is illustrated in FIG. 1.
  • a conventional electric-acoustic transducer 1 includes a diaphragm D, which is made of a thin film, and to one surface of which a coil V is fastened, and a magnetic circuit M, which includes a yoke y, a magnet m and a top plate p to generate magnetic flux in response to alternating current signals applied to the coil V.
  • the conventional electric-acoustic transducer 1 further includes a plate spring S, which elastically supports the magnetic circuit M in a casing C, and a rivet pin R, which fastens the plate spring S to the casing C.
  • the coil in the diaphragm D of the electric-acoustic transducer according to the conventional technique, the coil must be adhered to the thin synthetic resin diaphragm using adhesive.
  • the coil and the diaphragm are small and, particularly, the diaphragm may be easily deformed, it is difficult to handle them and adhere the coil to the diaphragm.
  • the plate spring for supporting the magnetic circuit in the casing may not withstand the load of the magnetic circuit, which moves according to the law of inertia, so that the elastic actuation of the plate spring may exceed the elastic limit, which is the maximum range within which the magnetic circuit normally vibrates in response to the coil to output sounds or vibrating force.
  • the plate spring may be deformed, the magnetic circuit may be damaged, or other elements in the casing may be deformed or damaged.
  • an object of the present invention is to provide a diaphragm for electric-acoustic transducers and an electric- acoustic transducer having the diaphragm, in which a coil can be precisely and easily disposed on a central portion of the diaphragm without error, vibrating loss of a magnetic circuit, attributable to vibration of the diaphragm, is prevented, and a plate spring, the magnetic circuit or other elements in a casing are prevented from being deformed or damaged, and which are constructed such that a yoke, a magnet and a top plate, which constitute the magnetic circuit, are coupled to each other without using an adhesive or welding, so that the magnetic circuit is prevented from being made untidy by foreign material such as adhesive.
  • the present invention provides a diaphragm for electric-acoustic transducers which is fastened at a central portion thereof to one surface of a coil and is supported at the outer edge thereof by an open end of a casing, so that the diaphragm vibrates in response to magnetic flux, which is formed in a gap defined by a yoke, a magnet and a top plate, depending on an alternating current signal applied to the coil, the diaphragm including: a support member fastened to one surface of the diaphragm to prevent the diaphragm from excessively sensitively reacting to external force; and a first annular support protrusion provided on a central portion of a first surface of the support member to maintain the coil at the correct position.
  • the support member may be a thin plate spring made of metal.
  • the support member may be a plate spring, which includes rims, which respectively form a central portion and an outer portion of the plate spring, the center rim and the outer rim being integrally coupled to each other through elastic ribs.
  • the support member may be a plate spring, which includes rims, which respectively form a central portion and an outer portion of the plate spring, the center rim and the outer rim being integrally coupled to each other through elastic ribs, wherein the first annular support protrusion protrudes from the circumferential inner edge of the center rim in one direction.
  • a second annular support protrusion may be provided on the circumferential outer edge of the second surface of the support member to maintain the diaphragm at a correct position.
  • the present invention provides an electric-acoustic transducer, including: a diaphragm provided with a coil fastened to the central portion of one surface of the diaphragm, the diaphragm being supported at the outer edge thereof by an open end of a casing; a magnetic circuit, including a yoke, a magnet and a top plate to form a magnetic flux when an alternating current signal is applied to the coil; and a plate spring to elastically support the magnetic circuit in the casing, so that a sound is output by vibration of the diaphragm, and a vibrating force is generated by vibration of the magnetic circuit, the electric- acoustic transducer further comprising: a support member fastened to the surface of the diaphragm to prevent the diaphragm from excessively sensitively reacting to external force; and an annular support protrusion provided on the central portion of a first surface of the support member to maintain the coil at the correct position.
  • the present invention provides an electric-acoustic transducer, including: a diaphragm provided with a coil fastened to the central portion of one surface of the diaphragm, the diaphragm being supported at the outer edge thereof by the open end of a casing; a magnetic circuit, including a yoke, a magnet and a top plate to form a magnetic flux when an alternating current signal is applied to the coil; and a plate spring to elastically support the magnetic circuit in the casing, so that a sound is output by vibration of the diaphragm, and a vibrating force is generated by vibration of the magnetic circuit, wherein: the central portion of the bottom of the casing protrudes to a predetermined height; the central portion of a plate spring, the lower surface of which is level, is placed on the upper surface of the protruding central portion of the bottom of the casing; the central portion of the plate spring and the protruding central portion of the casing are fitted
  • a diaphragm is constructed such that a coil is fitted over an annular support protrusion of a support member, so that the coil can be precisely and easily disposed on the central portion of the diaphragm without error.
  • the present invention provides an electric-acoustic transducer, in which a magnetic circuit can vibrate separately from the diaphragm. Therefore, the diaphragm, which is much lighter than the magnetic circuit, is prevented from undesirably vibrating even when alternating current signals in a frequency range within which only the magnetic circuit vibrates are applied to the coil, thus preventing vibrating loss of the magnetic circuit attributable to the vibration of the diaphragm.
  • the present invention can prevent the elastic movement of a plate spring from exceeding the elastic limit thereof because the plate spring cannot withstand the load of the magnetic circuit, which moves according to the law of inertia when external force is applied to the electric-acoustic transducer due to carelessness or deliberately, for example, in a falling impact test for testing durability. Therefore, a plate spring, the magnetic circuit or other elements in a casing can be prevented from being deformed or damaged.
  • a yoke, a magnet and a top plate are coupled to each other and are fastened to the plate spring without using adhesive or welding. That is, the present invention is configured such that the outer edge of the plate spring, which elastically supports the magnetic circuit including the yoke, the magnet and the top plate, is extended and bent to cover and hold the circumferential outer surface of the magnetic circuit. Therefore, processes of manufacturing the magnetic circuit and of fastening it to the plate spring are simplified. As well, the magnetic circuit can be prevented from being disordered by foreign material such as adhesive.
  • FIG. 1 is a sectional view showing the construction of a conventional electric- acoustic transducer and a diaphragm used in the electric-acoustic transducer;
  • FIG. 2 is a perspective view illustrating the construction of a first embodiment of a diaphragm, according to the present invention
  • FIG. 3 is an exploded perspective view illustrating the construction of the first embodiment of the diaphragm according to the present invention
  • FIG. 4 is a sectional view illustrating the operation of the first embodiment of the diaphragm according to the present invention.
  • FIG. 5 is a perspective view illustrating the construction of a second embodiment of a diaphragm, according to the present invention.
  • FIG. 6 is an enlarged sectional view of a critical part of the second embodiment of the diaphragm according to the present invention.
  • FIG. 7 is an exploded sectional view illustrating the construction of a first embodiment of an electric- acoustic transducer, according to the present invention.
  • FIGS. 8 and 9 are sectional views illustrating the construction of the first embodiment of the electric- acoustic transducer according to the present invention.
  • FIG. 10 is a sectional view illustrating the construction of a second embodiment of an electric-acoustic transducer, according to the present invention.
  • FIGS. 11 and 12 are sectional views illustrating the operation of the second embodiment of the electric- acoustic transducer according to the present invention.
  • FIG. 13 is an exploded perspective view showing another embodiment of the present invention.
  • FIG. 14 is a sectional view showing the embodiment of FIG. 13.
  • FIG. 2 is a perspective view illustrating the construction of a first embodiment of a diaphragm, according to the present invention.
  • FIG. 3 is an exploded perspective view illustrating the construction of the first embodiment of the diaphragm according to the present invention.
  • FIG. 4 is a sectional view illustrating the operation of the first embodiment of the diaphragm according to the present invention.
  • FIG. 5 is a perspective view illustrating the construction of a second embodiment of a diaphragm, according to the present invention.
  • FIG. 6 is an enlarged sectional view of a critical part of the second embodiment of the diaphragm according to the present invention.
  • FIG. 7 is an exploded sectional view illustrating the construction of a first embodiment of an electric- acoustic transducer, according to the present invention.
  • FIGS. 8 and 9 are sectional views illustrating the construction of the first embodiment of the electric- acoustic transducer according to the present invention.
  • FIG. 8 and 9 are sectional views illustrating the construction of the first embodiment of the electric- acoustic transducer according to the present invention.
  • FIG. 10 is a sectional view illustrating the construction of a second embodiment of an electric- acoustic transducer, according to the present invention.
  • FIGS. 11 and 12 are sectional views illustrating the operation of the second embodiment of the electric- acoustic transducer according to the present invention.
  • FIG. 13 is an exploded perspective view showing another embodiment of the present invention.
  • FIG. 14 is a sectional view showing the embodiment of FIG. 13.
  • a coil 11 is fastened on one surface thereof to the central portion of the diaphragm 12, and the outer edge of the diaphragm 12 is supported by an open end of a casing 20, so that the diaphragm 12 vibrates in response to magnetic flux, which is formed in a gap, defined by a yoke 15, a magnet 16 and a top plate 17, in response to alternating current signals applied to the coil 11.
  • the diaphragm 12 of the present invention further includes a support member 13, which is fastened to one surface of the diaphragm 12 to prevent the diaphragm 12 from excessively sensitively reacting to external force. Furthermore, an annular support protrusion 13a is provided on the central portion of one surface of the support member 13 to maintain the coil 11 at the correct position.
  • the term "oversensitive reaction of the diaphragm 12" means an event in which the diaphragm 12 vibrates even when a signal beyond the range of frequencies corresponding to alternating current signals, which are applied to the coil
  • the support member 13 comprises a thin metal plate spring and has a structure in which rims 13b and 13c are respectively provided on the central portion and the outer portion of the support member 13 and in which the center rim 13b and the outer rim 13c are integrally coupled to each other via elastic ribs 13d.
  • the support member 13 may be adhered or welded to the perimeter of a central dome part of the diaphragm 12 and to a perimeter of the diaphragm 12, or, alternatively, it may be closely adhered to the entire area of the diaphragm 12.
  • the support member 13 may be made of a thin metal plate so that it itself vibrates to output sound.
  • the center rim 13b and the outer rim 13c of the support member 13 are respectively fastened to the perimeter of the central dome part of the diaphragm 12 and the perimeter of the diaphragm 12.
  • the annular support protrusion 13a of the support member 13 may protrude from the circumferential inner or outer edge of the center rim 13b in one direction, or, alternatively, it may protrude from each of the circumferential inner and outer edges of the center rim 13b in one direction. Thanks to the construction using the annular support protrusion, the inner or outer surface of the coil 11 is fitted over or into the annular support protrusion 13a, so that the coil 11 can be stably seated on the support member.
  • annular depression which performs the same function as the annular support protrusion 13a, may be formed in one surface of the center rim 13b.
  • the coil 11 can be stably seated in the annular depression.
  • annular magnetic body 11a may be adhered to the circumferential outer surface of the coil 11, which is fastened to the support member 13.
  • the magnetic body 11a may be a metal body, which can be magnetized by magnetic force, or, alternatively, it may be a magnet.
  • the magnetic body 1 Ia is adhered to or embedded in the center rim 13b of the support member 13 to which the coil 11 is fastened.
  • the coil 11 can be precisely and easily fixed to the center of the diaphragm 12 using the annular support protrusion 13a of the support member 13 without an error.
  • the diaphragm 12 according to the present invention is supported on the inner surface of the open end of the casing 20.
  • fo resonance frequency
  • the support member 13 in which the support member 13 is fastened to the diaphragm 12, the support member 13 supports the diaphragm 12 and restrains the vibration of the diaphragm 12, so that the magnetic circuit 14 can vibrate when frequency signals are applied to the coil 11. Hence, the vibration of the magnetic circuit 14 is prevented from diminishing due to vibration of the diaphragm 12, so that the magnetic circuit can vibrate with a relatively large amplitude.
  • a second annular support protrusion 13e which maintains the diaphragm 12 at the correct position, may be provided on the circumferential outer edge of the corresponding surface of the outer rim 13c.
  • the second annular support protrusion 13e may be provided on a surface opposite the surface on which the annular support protrusion 13a is provided, or, alternatively, it may be provided on a surface oriented in the same direction as the surface on which the annular support protrusion 13a is provided.
  • the electric-acoustic transducer 10 of the present invention includes a diaphragm 12, which is provided with a coil 11 fastened to the central portion of one surface of the diaphragm 12 and is supported at the outer edge thereof by an open end of a casing 20.
  • the electric- acoustic transducer 10 further includes a magnetic circuit 14.
  • the magnetic circuit 14 includes a yoke 15, a magnet 16 and a top plate 17 to form magnetic flux when alternating current signals are applied to the coil 11.
  • the electric- acoustic transducer 10 further includes a plate spring 18, which elastically supports the magnetic circuit 14 in the casing 20, so that the electric-acoustic transducer 10 outputs sound using vibration of the diaphragm 12 and generates vibrating force using vibration of the magnetic circuit 14.
  • the electric- acoustic transducer 10 further includes a support member 13, which is fastened to the surface of the diaphragm 12 to prevent the diaphragm 12 from excessively sensitively reacting to external force, and an annular support protrusion 13a, which is provided on the central portion of one surface of the support member 13 to maintain the coil 11 at the correct position.
  • the diaphragm 12 may comprise a thin film, which is made of synthetic resin and has a major axis and a minor axis.
  • the diaphragm 12 has a shape in which a central dome part is formed in the center thereof, a planar part is formed around the dome part, an annular dome part is formed around the planar part and protrudes in the same direction as the vertical direction of the central dome part, and a planar part is formed around the annular dome part.
  • the support member 13 may comprise a thin metal plate spring and have a shape in which annular support protrusions 13b and 13c are respectively provided on the central portion and the outer portion of the support member 13 and in which the center rim 13b and the outer rim 13c are integrally coupled to each other via elastic ribs 13d.
  • the support member 13 may be adhered or welded to the planar part of the outer edge of the central dome part of the diaphragm 12 and to the planar part of the outer edge of the diaphragm 12, or, alternatively, it may be closely adhered to the entire area of the diaphragm 12.
  • the support member 13 may be made of a thin metal plate so that it itself vibrates to thus output sound. (The general construction of the support member 13, with the exception of the above-mentioned structure, remains the same as that of the diaphragm 12 of the electric-acoustic transducer described above.)
  • the magnet 16 constituting the magnetic circuit 14 has a planar body or a block, which is open at the center thereof.
  • the yoke 15 may include a protrusion, which is provided on at least one or all of the central portion and the circumferential outer edge thereof and has the same height as that of the magnet 16 and the top plate 17, so that a gap is defined by the yoke 15, the magnet 16 and the top plate 17.
  • the magnet 16 constituting the magnetic circuit 14 may include a first magnet body, which has a circular block shape and is disposed on the central portion of the yoke 15, and a second magnet body, which has a ring shape and surrounds the first magnet at a position spaced apart from the first magnet body by a predetermined distance. A configuration in which only one of the circular and the ring-shaped magnet bodies is seated on the yoke 15 is possible.
  • the top plate 17 may comprise a cold-rolled steel plate, which is provided on the upper surface of the magnet 16.
  • a weight 14a which is a tungsten block, may be provided on the circumferential outer surfaces of the magnet 16 and the top plate 17 to increase the weight of the magnetic circuit 14, thus increasing the vibrating force thereof.
  • the plate spring 18 includes a fastening rim 18a, which is fastened to the central portion of the inner surface of the casing 20 using a rivet pin 19, a support rim 18b, which holds and supports the magnetic circuit 14, and an elastic part 18c, which extends from the fastening rim 18a in a planar shape and couples the support rim 18b to the fastening rim 18a to elastically support the magnetic circuit 14.
  • the fastening rim 18a is fastened to the central portion of the inner surface of the casing by fitting it over the rivet pin 19.
  • the support rim 18b covers and tightly holds the circumferential outer surface of the layered body, including the yoke 15, the magnet 16 and the top plate 17.
  • the elastic part 18c is a surface, which is disposed between the fastening rim 18a and the support rim 18b and has relatively large openings formed by cutting portions thereof.
  • the elastic part 18c may be remaining parts of a surface between the fastening rim (18a) and the support rim (18b) after parts of the surface between the fastening rim (18a) and the support rim (18b) are cut such that the area of the cut parts is greater than that of the remaining part.
  • the elastic part 18c may be formed by cutting parts of the surface between the fastening rim 18a and the support rim 18b such that several ribs, each of which has a spiral shape or a zigzag shape, are formed in the surface.
  • the elastic part 18c is inclined at a predetermined angle such that the support rim 18b is disposed higher than the fastening rim 18a.
  • the support member 13 in which the support member 13 is fastened to the diaphragm 12, the support member 13 supports the diaphragm 12 and restrains the vibration of the diaphragm 12, such that the magnetic circuit 14 can vibrate in response to frequency signals applied to the coil 11.
  • the vibration of the magnetic circuit 14 is prevented from diminishing due to vibration of the diaphragm 12, so that magnetic circuit vibrates with a relatively large amplitude, thereby generating a relatively strong vibrating force.
  • the diaphragm 12 reacts to alternating current signals of the coil 11 and to magnet flux generated in the gap in the magnetic circuit 14 and thus vibrates with a resonance frequency (fo) of 300Hz or within a range from 300Hz to 20KHz.
  • fo resonance frequency
  • the diaphragm 12 reacts to the coil 11 without undesirably moving. Such vibration of the diaphragm 12 outputs sound.
  • the electric-acoustic transducer 10 of the present invention may be constructed such that each of the magnet 16 and the top plate 17 has an opening in the center thereof, the end of the rivet pin 19 extends and passes through the yoke 15, the magnet 16 and the top plate 17, and a stopper 19a is provided on the end of the rivet pin 19 to prevent the elastic actuation of the plate spring 18, which functions to support the magnetic circuit 14, from exceeding an elastic limit.
  • the coil 11, which is fastened to one surface of the diaphragm 12, is disposed in the gap, which is defined by the yoke 15, by the magnet 16, which is seated on the yoke 15, and by the top plate 17.
  • the plate spring 18 for supporting the magnetic circuit 14 may not withstand the load of the magnetic circuit 14, which moves according to the law of inertia, so that the elastic actuation of the plate spring 18 may exceed its elastic limit. In this case, there is a possibility of interference between the magnetic circuit 14, the coil 11 and the diaphragm 12.
  • the stopper of the rivet pin realizes a construction for preventing the movement of the magnetic circuit 14 from exceeding the elastic limit with respect to the direction towards the diaphragm 12.
  • the inner surface of the casing 20 serves to prevent the movement of the magnetic circuit 14 from exceeding the elastic limit.
  • the circumferential outer surface of the plate spring 18 extends in one direction and covers the circumferential outer surface of the magnetic circuit 14, which is seated on the plate spring 18.
  • the extending edge of the plate spring 18 is bent so as to compress and thus firmly hold the magnetic circuit 14.
  • the circumferential outer surface of the plate spring 18 may be the circumferential outer surface of the support rim 18b.
  • a stepped part is formed in the circumferential outer edge of the upper surface of the top plate 17, which is disposed at the uppermost position of the magnetic circuit 14, so that the bent outer edge of the plate spring 18 is brought into close surface contact with the stepped part of the top plate 17.
  • the stepped part which is formed in the circumferential outer edge of the upper surface of the top plate 17, has a depth corresponding to the thickness of the plate spring 18. The reason for this is that, if the bent edge of the plate spring 18, which is brought into close contact with the upper surface of the top plate 17, is level with the surface of the top plate 17, the leakage of magnetic flux can be prevented.
  • the yoke 15, the magnet 16 and the top plate 17, which constitute the magnetic circuit 14, can be firmly fixed at the correct positions without using an adhesive or welding.
  • partial support protrusions 13f which protrude to form a dashed line shape, may be provided on each of the central portion of one surface of a plate spring 13 and the outer edge of the other surface thereof.
  • notches 1 Ib and 12a are respectively formed in a coil 11 and a diaphragm 12, which are seated onto the cor- responding partial support protrusions 13f, at positions corresponding to the partial support protrusions 13f such that the partial support protrusions 13f are fitted into the corresponding insert notches l ib and 12a.
  • the partial support protrusions 13f substitute for the above-mentioned annular support protrusion 13a and second annular support protrusion 13e.
  • the partial support protrusions 13f may substitute for both the annular support protrusion 13a and the second annular support protrusion 13e or, alternatively, one thereof may substitute for only one of them, as necessary.
  • the partial support protrusions 13f of the plate spring 13 engage with the notches 1 Ib or 12a of the coil 11 or the diaphragm 12, so that the coil 11 or the diaphragm 12 can be easily disposed at the correct position.
  • the coil 11 or the diaphragm 12 can be guided such that it is coupled to the plate spring 13 in the correct direction.
  • an acoustic transducer 10 includes a diaphragm 12, which is provided with a coil 11 fastened to the central portion of one surface of the diaphragm 12 and is supported at the outer edge thereof by an open end of a casing 20.
  • the acoustic transducer 10 further includes a magnetic circuit 14.
  • the magnetic circuit 14 includes a yoke 15, a magnet 16 and a top plate 17 to form magnetic flux when alternating current signals are applied to the coil 11.
  • the acoustic transducer 10 further includes a plate spring 18, which elastically supports the magnetic circuit 14 in the casing 20, so that the electric-acoustic transducer 10 outputs sound using the vibration of the diaphragm 12 and generates vibrating force using the vibration of the magnetic circuit 14.
  • the central portion of the bottom of the casing 20 protrudes to a predetermined height.
  • the central portion of a plate spring 18, the lower surface of which is level, is placed on the upper surface of the protruding central portion of the bottom of the casing 20.
  • the central portion of the plate spring 18 and the protruding central portion of the bottom of the casing 20 are fitted over the lower end of a rivet pin, which is provided at an upper end thereof with a stopper 19a, such that they are compressed and held by the rivet pin.
  • the ring-shaped magnet 16 and the ring-shaped top plate 17 are placed on the central portion and the perimeter of the upper surface of the yoke 15, such that a gap, in which the coil 11 is disposed, is defined in the magnet 16 and the top plate 17.
  • An extending circumferential outer surface of the plate spring 18 covers both the circumferential outer surface of the yoke 15 and the circumferential outer surfaces of the magnet 16 and the top plate 17, which are disposed on the perimeter of the yoke 15, and is bent onto the upper surface of the top plate 17 to compress and hold the yoke 15, the magnet 16 and the top plate 17.
  • the plate spring 18 is fastened to the protruding central portion of the casing 20, the plate spring 18 can be moved upwards or downwards at a position higher than the bottom in the casing 20. Furthermore, because the lower surface of the yoke 15 is inclined, when the plate spring 18 is moved downwards, the yoke 15 can also be moved downwards without interfering with the plate spring 18.
  • the present invention described above is an electric-acoustic transducer (a signal output device), such as a speaker, a receiver, a buzzer, a vibrator, etc.
  • a signal output device such as a speaker, a receiver, a buzzer, a vibrator, etc.
  • the case in which the above-mentioned device is applied to an earphone or a speaker system must also be regarded as falling with the scope of the present invention.
  • the present invention can be used as an earphone.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Electromagnetism (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

A diaphragm for electric-acoustic transducers and an electric-acoustic transducer having the diaphragm are disclosed. The diaphragm (12) is coupled at a central position thereof to a coil (11) and is supported at an outer edge thereof by an open end of a casing (20), so that the diaphragm vibrates in response to magnetic flux, formed in a gap defined by a yoke (15), a magnet (16) and a top plate (17), when alternating current signals are applied to the coil (11). The diaphragm (12) further includes a support member (13), which is fastened to one surface of the diaphragm to prevent the diaphragm from excessively sensitively reacting to external force. An annular support protrusion (13a) is provided on the central portion of one surface of the support member (13) to support the coil (11) at the correct position.

Description

Description
DIAPHRAGM OF THE ELECTRONIC SOUNDER AND THE ELECTRONIC SOUND WHICH HAS THE DIAPHRAGM
Technical Field
[1] The present invention relates to a diaphragm for electric- acoustic transducers and an electric- acoustic transducer having the diaphragm. Background Art
[2] Generally, electric-acoustic transducers are acoustic output devices, such as speakers, receivers, buzzers, and vibrators, which convert electric signals, input from signal sources, into mechanical signals to output sounds or generate vibrating force. Earphones and speaker systems are representative examples of devices using such acoustic output devices.
[3] In conventional electric- acoustic transducers, a magnet and a top plate are placed on a yoke in positional sequence and are adhered or welded to the yoke. A coil, which is fastened to one surface of a diaphragm, is disposed in a gap defined in the magnet and the top plate. Therefore, a magnetic circuit, which includes the yoke, the magnet and the top plate, and/or the coil and the diaphragm vibrate in response to magnetic flux, generated in the gap, depending on the direction of alternating current signals applied to the coil, thus generating vibrating force and/or sounds.
[4] An example of an electric-acoustic transducer, which outputs sounds using the vibration of diaphragms and outputs vibrating force using the vibration of magnetic circuits, is illustrated in FIG. 1. As shown in FIG. 1, a conventional electric-acoustic transducer 1 includes a diaphragm D, which is made of a thin film, and to one surface of which a coil V is fastened, and a magnetic circuit M, which includes a yoke y, a magnet m and a top plate p to generate magnetic flux in response to alternating current signals applied to the coil V. The conventional electric-acoustic transducer 1 further includes a plate spring S, which elastically supports the magnetic circuit M in a casing C, and a rivet pin R, which fastens the plate spring S to the casing C.
[5] However, in the diaphragm D of the electric-acoustic transducer according to the conventional technique, the coil must be adhered to the thin synthetic resin diaphragm using adhesive. Here, in the case of a relatively small electric- acoustic transducer, because the coil and the diaphragm are small and, particularly, the diaphragm may be easily deformed, it is difficult to handle them and adhere the coil to the diaphragm. In addition, it is very difficult to dispose the coil at the correct portion (the center) of the diaphragm.
[6] Furthermore, in the case of a dual type electric- acoustic transducer, which can output sounds using the vibration of a diaphragm and output vibrating force using the vibration of a magnetic circuit, even when alternating current signals in a frequency range, within which only the magnetic circuit vibrates, are applied to the coil, the thin diaphragm may undesirably vibrate, because it is much lighter than the magnetic circuit. Therefore, there is a problem in that the magnetic circuit undergoes vibrating loss in an amount equal to the vibration of the diaphragm.
[7] As well, in the conventional electric-acoustic transducer, when external force is applied to the electric-acoustic transducer, either due to carelessness or deliberately, for example, in a falling impact test for testing the durability thereof, the plate spring for supporting the magnetic circuit in the casing may not withstand the load of the magnetic circuit, which moves according to the law of inertia, so that the elastic actuation of the plate spring may exceed the elastic limit, which is the maximum range within which the magnetic circuit normally vibrates in response to the coil to output sounds or vibrating force. In this case, the plate spring may be deformed, the magnetic circuit may be damaged, or other elements in the casing may be deformed or damaged.
[8] Moreover, in the conventional electric-acoustic transducer, because the yoke, the magnet and the top plate are placed on top of one another and are coupled to each other using adhesive or by welding, there are disadvantages in that the coupling process inconveniences a worker and the area around the portion to which adhesive is applied is untidy. Disclosure of Invention
Technical Problem
[9] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a diaphragm for electric-acoustic transducers and an electric- acoustic transducer having the diaphragm, in which a coil can be precisely and easily disposed on a central portion of the diaphragm without error, vibrating loss of a magnetic circuit, attributable to vibration of the diaphragm, is prevented, and a plate spring, the magnetic circuit or other elements in a casing are prevented from being deformed or damaged, and which are constructed such that a yoke, a magnet and a top plate, which constitute the magnetic circuit, are coupled to each other without using an adhesive or welding, so that the magnetic circuit is prevented from being made untidy by foreign material such as adhesive. Technical Solution
[10] In order to accomplish the above object, in one aspect, the present invention provides a diaphragm for electric-acoustic transducers which is fastened at a central portion thereof to one surface of a coil and is supported at the outer edge thereof by an open end of a casing, so that the diaphragm vibrates in response to magnetic flux, which is formed in a gap defined by a yoke, a magnet and a top plate, depending on an alternating current signal applied to the coil, the diaphragm including: a support member fastened to one surface of the diaphragm to prevent the diaphragm from excessively sensitively reacting to external force; and a first annular support protrusion provided on a central portion of a first surface of the support member to maintain the coil at the correct position.
[11] The support member may be a thin plate spring made of metal. Alternatively, the support member may be a plate spring, which includes rims, which respectively form a central portion and an outer portion of the plate spring, the center rim and the outer rim being integrally coupled to each other through elastic ribs. As a further alternative, the support member may be a plate spring, which includes rims, which respectively form a central portion and an outer portion of the plate spring, the center rim and the outer rim being integrally coupled to each other through elastic ribs, wherein the first annular support protrusion protrudes from the circumferential inner edge of the center rim in one direction. Furthermore, a second annular support protrusion may be provided on the circumferential outer edge of the second surface of the support member to maintain the diaphragm at a correct position.
[12] In order to accomplish the above object, in another aspect, the present invention provides an electric-acoustic transducer, including: a diaphragm provided with a coil fastened to the central portion of one surface of the diaphragm, the diaphragm being supported at the outer edge thereof by an open end of a casing; a magnetic circuit, including a yoke, a magnet and a top plate to form a magnetic flux when an alternating current signal is applied to the coil; and a plate spring to elastically support the magnetic circuit in the casing, so that a sound is output by vibration of the diaphragm, and a vibrating force is generated by vibration of the magnetic circuit, the electric- acoustic transducer further comprising: a support member fastened to the surface of the diaphragm to prevent the diaphragm from excessively sensitively reacting to external force; and an annular support protrusion provided on the central portion of a first surface of the support member to maintain the coil at the correct position.
[13] In order to accomplish the above object, in another aspect, the present invention provides an electric-acoustic transducer, including: a diaphragm provided with a coil fastened to the central portion of one surface of the diaphragm, the diaphragm being supported at the outer edge thereof by the open end of a casing; a magnetic circuit, including a yoke, a magnet and a top plate to form a magnetic flux when an alternating current signal is applied to the coil; and a plate spring to elastically support the magnetic circuit in the casing, so that a sound is output by vibration of the diaphragm, and a vibrating force is generated by vibration of the magnetic circuit, wherein: the central portion of the bottom of the casing protrudes to a predetermined height; the central portion of a plate spring, the lower surface of which is level, is placed on the upper surface of the protruding central portion of the bottom of the casing; the central portion of the plate spring and the protruding central portion of the casing are fitted over the lower end of a rivet pin, which is provided at the upper end thereof with a stopper, such that the central portion of the plate spring and the protruding central portion of the casing are compressed and held by the rivet pin; the yoke is placed on the upper surface of the plate spring, the yoke having an opening in the center thereof and a lower surface inclined upwards from the outer edge thereof to the inner edge thereof; the magnet, having a ring shape, and the top plate, having a ring shape, are placed on the central portion and the perimeter of the upper surface of the yoke, such that a gap, in which the coil is disposed, is defined in the magnet and the top plate; an extending circumferential outer surface of the plate spring covers both the circumferential outer surface of the yoke and circumferential outer surfaces of the magnet and the top plate, which are disposed on the perimeter of the yoke, and is bent onto the upper surface of the top plate to compress and hold the yoke, the magnet and the top plate; and a support member is seated on the inner surface of the open end of the casing, with an annular support protrusion on the circumferential outer edge of the first surface of the support member, the annular support protrusion maintaining and supporting the diaphragm at the correct position, and an annular support protrusion provided on the second surface of the support member, the annular support protrusion maintaining and supporting the coil at the correct position.
[14] The features and advantages of the present invention will be more clearly understood from the following detailed description with reference to the attached drawings. The terms and words used in the specification and claims are not necessarily limited to typical or dictionary meanings, but must be understood to indicate concepts selected by the inventor as the best method of illustrating the present invention, and must be interpreted as having meanings and concepts adapted to the scope and sprit of the present invention to promote an understanding of the technology of the present invention.
Advantageous Effects
[15] In the present invention, a diaphragm is constructed such that a coil is fitted over an annular support protrusion of a support member, so that the coil can be precisely and easily disposed on the central portion of the diaphragm without error.
[16] Furthermore, the present invention provides an electric-acoustic transducer, in which a magnetic circuit can vibrate separately from the diaphragm. Therefore, the diaphragm, which is much lighter than the magnetic circuit, is prevented from undesirably vibrating even when alternating current signals in a frequency range within which only the magnetic circuit vibrates are applied to the coil, thus preventing vibrating loss of the magnetic circuit attributable to the vibration of the diaphragm.
[17] In addition, the present invention can prevent the elastic movement of a plate spring from exceeding the elastic limit thereof because the plate spring cannot withstand the load of the magnetic circuit, which moves according to the law of inertia when external force is applied to the electric-acoustic transducer due to carelessness or deliberately, for example, in a falling impact test for testing durability. Therefore, a plate spring, the magnetic circuit or other elements in a casing can be prevented from being deformed or damaged.
[18] Moreover, in the present invention, a yoke, a magnet and a top plate are coupled to each other and are fastened to the plate spring without using adhesive or welding. That is, the present invention is configured such that the outer edge of the plate spring, which elastically supports the magnetic circuit including the yoke, the magnet and the top plate, is extended and bent to cover and hold the circumferential outer surface of the magnetic circuit. Therefore, processes of manufacturing the magnetic circuit and of fastening it to the plate spring are simplified. As well, the magnetic circuit can be prevented from being disordered by foreign material such as adhesive. Brief Description of the Drawings
[19] FIG. 1 is a sectional view showing the construction of a conventional electric- acoustic transducer and a diaphragm used in the electric-acoustic transducer;
[20] FIG. 2 is a perspective view illustrating the construction of a first embodiment of a diaphragm, according to the present invention;
[21] FIG. 3 is an exploded perspective view illustrating the construction of the first embodiment of the diaphragm according to the present invention;
[22] FIG. 4 is a sectional view illustrating the operation of the first embodiment of the diaphragm according to the present invention;
[23] FIG. 5 is a perspective view illustrating the construction of a second embodiment of a diaphragm, according to the present invention;
[24] FIG. 6 is an enlarged sectional view of a critical part of the second embodiment of the diaphragm according to the present invention;
[25] FIG. 7 is an exploded sectional view illustrating the construction of a first embodiment of an electric- acoustic transducer, according to the present invention;
[26] FIGS. 8 and 9 are sectional views illustrating the construction of the first embodiment of the electric- acoustic transducer according to the present invention;
[27] FIG. 10 is a sectional view illustrating the construction of a second embodiment of an electric-acoustic transducer, according to the present invention;
[28] FIGS. 11 and 12 are sectional views illustrating the operation of the second embodiment of the electric- acoustic transducer according to the present invention;
[29] FIG. 13 is an exploded perspective view showing another embodiment of the present invention; and
[30] FIG. 14 is a sectional view showing the embodiment of FIG. 13.
[31] <Description of the elements in the drawings>
[32] 10: acoustic transducer 11: coil
[33] 12: diaphragm 13: support member
[34] 13a: first annular support protrusion 13b: center rim
[35] 13c: outer rim 13d: elastic rib
[36] 13e: second annular support protrusion 14: magnetic circuit
[37] 15: yoke 16: magnet
[38] 17: top plate 18: plate spring
[39] 18a: fastening rim 18b: support rim
[40] 18c: elastic part 19: rivet pin
[41] 19a: stopper
Best Mode for Carrying Out the Invention
[42] The above and other objects, features and advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings.
[43] Hereinafter, preferred embodiments of a diaphragm for electric- acoustic transducers and an electric-acoustic transducer having the diaphragm according to the present invention will be described in detail with reference to the attached drawings.
[44] Reference now should be made to the drawings, in which the same reference numerals are used throughout the different drawings to designate the same or similar components. Furthermore, in the description of the present invention, explanation of well-known functions and constructions will be omitted, so that the present invention can be described more clearly.
[45] A description of the accompanying drawings, provided for comprehension of the present invention, will precede a description of the present invention. FIG. 2 is a perspective view illustrating the construction of a first embodiment of a diaphragm, according to the present invention. FIG. 3 is an exploded perspective view illustrating the construction of the first embodiment of the diaphragm according to the present invention. FIG. 4 is a sectional view illustrating the operation of the first embodiment of the diaphragm according to the present invention.
[46] FIG. 5 is a perspective view illustrating the construction of a second embodiment of a diaphragm, according to the present invention. FIG. 6 is an enlarged sectional view of a critical part of the second embodiment of the diaphragm according to the present invention. FIG. 7 is an exploded sectional view illustrating the construction of a first embodiment of an electric- acoustic transducer, according to the present invention. [47] FIGS. 8 and 9 are sectional views illustrating the construction of the first embodiment of the electric- acoustic transducer according to the present invention. FIG.
10 is a sectional view illustrating the construction of a second embodiment of an electric- acoustic transducer, according to the present invention. FIGS. 11 and 12 are sectional views illustrating the operation of the second embodiment of the electric- acoustic transducer according to the present invention. FIG. 13 is an exploded perspective view showing another embodiment of the present invention. FIG. 14 is a sectional view showing the embodiment of FIG. 13.
[48] The present invention will be described in detail herein below with reference to the attached drawings.
[49] As shown in FIGS. 2 and 4, in the diaphragm for electric-acoustic transducers according to the present invention, a coil 11 is fastened on one surface thereof to the central portion of the diaphragm 12, and the outer edge of the diaphragm 12 is supported by an open end of a casing 20, so that the diaphragm 12 vibrates in response to magnetic flux, which is formed in a gap, defined by a yoke 15, a magnet 16 and a top plate 17, in response to alternating current signals applied to the coil 11. The diaphragm 12 of the present invention further includes a support member 13, which is fastened to one surface of the diaphragm 12 to prevent the diaphragm 12 from excessively sensitively reacting to external force. Furthermore, an annular support protrusion 13a is provided on the central portion of one surface of the support member 13 to maintain the coil 11 at the correct position.
[50] For reference, the term "oversensitive reaction of the diaphragm 12" means an event in which the diaphragm 12 vibrates even when a signal beyond the range of frequencies corresponding to alternating current signals, which are applied to the coil
11 to output sound using vibration of the diaphragm 12, is input, or even when external force, which is generated, for example, by a free fall, is applied.
[51] Here, in the diaphragm 12 for electric-acoustic transducers according to the present invention, preferably, the support member 13 comprises a thin metal plate spring and has a structure in which rims 13b and 13c are respectively provided on the central portion and the outer portion of the support member 13 and in which the center rim 13b and the outer rim 13c are integrally coupled to each other via elastic ribs 13d.
[52] The support member 13 may be adhered or welded to the perimeter of a central dome part of the diaphragm 12 and to a perimeter of the diaphragm 12, or, alternatively, it may be closely adhered to the entire area of the diaphragm 12. As a further alternative, the support member 13 may be made of a thin metal plate so that it itself vibrates to output sound. [53] Here, the center rim 13b and the outer rim 13c of the support member 13 are respectively fastened to the perimeter of the central dome part of the diaphragm 12 and the perimeter of the diaphragm 12.
[54] Furthermore, the annular support protrusion 13a of the support member 13 may protrude from the circumferential inner or outer edge of the center rim 13b in one direction, or, alternatively, it may protrude from each of the circumferential inner and outer edges of the center rim 13b in one direction. Thanks to the construction using the annular support protrusion, the inner or outer surface of the coil 11 is fitted over or into the annular support protrusion 13a, so that the coil 11 can be stably seated on the support member.
[55] In addition, in place of the annular support protrusion 13a of the support member 13, an annular depression, which performs the same function as the annular support protrusion 13a, may be formed in one surface of the center rim 13b. In this case, the coil 11 can be stably seated in the annular depression.
[56] As well, an annular magnetic body 11a may be adhered to the circumferential outer surface of the coil 11, which is fastened to the support member 13.
[57] The magnetic body 11a may be a metal body, which can be magnetized by magnetic force, or, alternatively, it may be a magnet. The magnetic body 1 Ia is adhered to or embedded in the center rim 13b of the support member 13 to which the coil 11 is fastened.
[58] In this case, when no alternating current signals are input to the coil 11, the magnetic force of the magnet 16 is applied to the top plate 17 and the yoke 15, so that they are attracted to each other. When alternating current signals are applied to the coil 11, ma gnetic force of the annular magnetic body is added to the input signals. Thus, vibrating force can be further increased.
[59] In the diaphragm 12 according to the present invention having the above-mentioned construction, because the coil 11 is fitted over or into the annular support protrusion 13a of the support member 13, it can be fixed at the correct position, thus preventing the phenomenon in which, when the diaphragm 12 vibrates, it leans in an incorrect direction and thus distorts the output.
[60] Furthermore, the coil 11 can be precisely and easily fixed to the center of the diaphragm 12 using the annular support protrusion 13a of the support member 13 without an error.
[61] Meanwhile, as shown in FIG. 4, the diaphragm 12 according to the present invention is supported on the inner surface of the open end of the casing 20. A magnetic circuit 14, which includes the yoke 15, the magnet 16 and the top plate 17, and functions to form magnetic flux in response to alternating current signals applied to the coil 11, is elastically fastened to the central portion of the inner surface of the casing 20 using a plate spring 18, thus manufacturing an acoustic transducer 10. On the assumption that the magnetic circuit 14, which is supported by the plate spring 18, vibrates in a range of a resonance frequency (fo) from 100Hz to 175Hz in response to the coil 11, the magnetic circuit 14 must firmly vibrate in response to the coil 11. However, in the case of the conventional technique, in which the diaphragm 12 including the coil 11 is not supported by the support member 13, because the magnetic circuit 14 is heavier than the diaphragm 12, the magnetic circuit 14 vibrates with a relatively small amplitude, but the diaphragm 11 vibrates with a relatively large amplitude. Therefore, large vibrating force cannot be generated.
[62] However, unlike the conventional technique, in the present invention, in which the support member 13 is fastened to the diaphragm 12, the support member 13 supports the diaphragm 12 and restrains the vibration of the diaphragm 12, so that the magnetic circuit 14 can vibrate when frequency signals are applied to the coil 11. Hence, the vibration of the magnetic circuit 14 is prevented from diminishing due to vibration of the diaphragm 12, so that the magnetic circuit can vibrate with a relatively large amplitude.
[63] That is, in the present invention, in the case where the magnetic circuit 14 vibrates separately from the diaphragm 12, even when alternating current signals within a frequency range, for example, a resonance frequency (fo) ranging from 100Hz to 175Hz, which vibrates only the magnetic circuit 14, are applied, the diaphragm 12, which is thin and is much lighter than the magnetic circuit 14, is prevented from vibrating. Therefore, vibration loss of the magnetic circuit 14 is prevented in an amount corresponding to the amount of vibration of the diaphragm 12.
[64] Furthermore, as shown in FIGS. 5 and 6, in the diaphragm 12 of the electric-acoustic transducer of the present invention, a second annular support protrusion 13e, which maintains the diaphragm 12 at the correct position, may be provided on the circumferential outer edge of the corresponding surface of the outer rim 13c.
[65] Here, the second annular support protrusion 13e may be provided on a surface opposite the surface on which the annular support protrusion 13a is provided, or, alternatively, it may be provided on a surface oriented in the same direction as the surface on which the annular support protrusion 13a is provided.
[66] In this case, the circumferential outer edge of the diaphragm 12 is fitted and seated into the circumferential inner surface of the second annular support protrusion 13e, thus preventing the diaphragm 12 from being undesirably displaced from the support member 13.
[67] Meanwhile, as shown in FIGS. 7 through 9, the electric-acoustic transducer 10 of the present invention includes a diaphragm 12, which is provided with a coil 11 fastened to the central portion of one surface of the diaphragm 12 and is supported at the outer edge thereof by an open end of a casing 20. The electric- acoustic transducer 10 further includes a magnetic circuit 14. The magnetic circuit 14 includes a yoke 15, a magnet 16 and a top plate 17 to form magnetic flux when alternating current signals are applied to the coil 11. The electric- acoustic transducer 10 further includes a plate spring 18, which elastically supports the magnetic circuit 14 in the casing 20, so that the electric-acoustic transducer 10 outputs sound using vibration of the diaphragm 12 and generates vibrating force using vibration of the magnetic circuit 14. The electric- acoustic transducer 10 further includes a support member 13, which is fastened to the surface of the diaphragm 12 to prevent the diaphragm 12 from excessively sensitively reacting to external force, and an annular support protrusion 13a, which is provided on the central portion of one surface of the support member 13 to maintain the coil 11 at the correct position.
[68] In the electric- acoustic transducer 10 of the present invention, the diaphragm 12 may comprise a thin film, which is made of synthetic resin and has a major axis and a minor axis. The diaphragm 12 has a shape in which a central dome part is formed in the center thereof, a planar part is formed around the dome part, an annular dome part is formed around the planar part and protrudes in the same direction as the vertical direction of the central dome part, and a planar part is formed around the annular dome part.
[69] Furthermore, in the electric- acoustic transducer 10 of the present invention, the support member 13 may comprise a thin metal plate spring and have a shape in which annular support protrusions 13b and 13c are respectively provided on the central portion and the outer portion of the support member 13 and in which the center rim 13b and the outer rim 13c are integrally coupled to each other via elastic ribs 13d.
[70] The support member 13 may be adhered or welded to the planar part of the outer edge of the central dome part of the diaphragm 12 and to the planar part of the outer edge of the diaphragm 12, or, alternatively, it may be closely adhered to the entire area of the diaphragm 12. As a further alternative, the support member 13 may be made of a thin metal plate so that it itself vibrates to thus output sound. (The general construction of the support member 13, with the exception of the above-mentioned structure, remains the same as that of the diaphragm 12 of the electric-acoustic transducer described above.)
[71] Furthermore, in the electric- acoustic transducer 10 of the present invention, the yoke
15, constituting the magnetic circuit 14, has a planar body or a block, which is open at the center thereof. The yoke 15 may include a protrusion, which is provided on at least one or all of the central portion and the circumferential outer edge thereof and has the same height as that of the magnet 16 and the top plate 17, so that a gap is defined by the yoke 15, the magnet 16 and the top plate 17. [72] The magnet 16 constituting the magnetic circuit 14 may include a first magnet body, which has a circular block shape and is disposed on the central portion of the yoke 15, and a second magnet body, which has a ring shape and surrounds the first magnet at a position spaced apart from the first magnet body by a predetermined distance. A configuration in which only one of the circular and the ring-shaped magnet bodies is seated on the yoke 15 is possible.
[73] The top plate 17 may comprise a cold-rolled steel plate, which is provided on the upper surface of the magnet 16.
[74] In addition, in the magnetic circuit 14, a weight 14a, which is a tungsten block, may be provided on the circumferential outer surfaces of the magnet 16 and the top plate 17 to increase the weight of the magnetic circuit 14, thus increasing the vibrating force thereof.
[75] Preferably, in the electric-acoustic transducer 10 of the present invention, the plate spring 18 includes a fastening rim 18a, which is fastened to the central portion of the inner surface of the casing 20 using a rivet pin 19, a support rim 18b, which holds and supports the magnetic circuit 14, and an elastic part 18c, which extends from the fastening rim 18a in a planar shape and couples the support rim 18b to the fastening rim 18a to elastically support the magnetic circuit 14.
[76] Here, preferably, the fastening rim 18a is fastened to the central portion of the inner surface of the casing by fitting it over the rivet pin 19.
[77] The support rim 18b covers and tightly holds the circumferential outer surface of the layered body, including the yoke 15, the magnet 16 and the top plate 17.
[78] The elastic part 18c is a surface, which is disposed between the fastening rim 18a and the support rim 18b and has relatively large openings formed by cutting portions thereof. In detail, the elastic part 18c may be remaining parts of a surface between the fastening rim (18a) and the support rim (18b) after parts of the surface between the fastening rim (18a) and the support rim (18b) are cut such that the area of the cut parts is greater than that of the remaining part. Preferably, the elastic part 18c may be formed by cutting parts of the surface between the fastening rim 18a and the support rim 18b such that several ribs, each of which has a spiral shape or a zigzag shape, are formed in the surface. The elastic part 18c is inclined at a predetermined angle such that the support rim 18b is disposed higher than the fastening rim 18a.
[79] In the electric- acoustic transducer 10 of the present invention having the above- mentioned construction, as shown in FIG. 8, on the assumption that the magnetic circuit 14, which is supported by the plate spring 18, vibrates in a range of a resonance frequency (fo) from 100Hz to 175Hz or from 150Hz to 200Hz in response to the coil 11, the magnetic circuit 14 must vibrate in response to the coil 11. However, in the case of the conventional technique, in which the diaphragm 12 including the coil 11 is not supported by the support member 13, because the magnetic circuit 14 is heavier than the diaphragm 12, the magnetic circuit 14 vibrates with a relatively small amplitude, but the diaphragm 11 vibrates with a relatively large amplitude. Therefore, a large vibrating force cannot be generated.
[80] However, unlike the conventional technique, in the present invention, in which the support member 13 is fastened to the diaphragm 12, the support member 13 supports the diaphragm 12 and restrains the vibration of the diaphragm 12, such that the magnetic circuit 14 can vibrate in response to frequency signals applied to the coil 11. Hence, the vibration of the magnetic circuit 14 is prevented from diminishing due to vibration of the diaphragm 12, so that magnetic circuit vibrates with a relatively large amplitude, thereby generating a relatively strong vibrating force.
[81] Meanwhile, in the electric- acoustic transducer 10 of the present invention, as shown in FIG. 9, the diaphragm 12 reacts to alternating current signals of the coil 11 and to magnet flux generated in the gap in the magnetic circuit 14 and thus vibrates with a resonance frequency (fo) of 300Hz or within a range from 300Hz to 20KHz. Here, because the magnetic circuit 14 is heavier than the diaphragm 12, the diaphragm 12 reacts to the coil 11 without undesirably moving. Such vibration of the diaphragm 12 outputs sound.
[82] Furthermore, as shown in FIG. 10, the electric-acoustic transducer 10 of the present invention may be constructed such that each of the magnet 16 and the top plate 17 has an opening in the center thereof, the end of the rivet pin 19 extends and passes through the yoke 15, the magnet 16 and the top plate 17, and a stopper 19a is provided on the end of the rivet pin 19 to prevent the elastic actuation of the plate spring 18, which functions to support the magnetic circuit 14, from exceeding an elastic limit.
[83] In this case, as shown in FIGS. 11 and 12, the coil 11, which is fastened to one surface of the diaphragm 12, is disposed in the gap, which is defined by the yoke 15, by the magnet 16, which is seated on the yoke 15, and by the top plate 17. The magnetic circuit 14, including the yoke 15, the magnet 16 and the top plate 17, vibrates in response to magnetic flux, generated in the gap, depending on the direction of an alternating current signal applied to the coil 11, thereby generating vibrating force. Here, if the amplitude of vibration is excessively large due to a high input value, or if external force is applied to the electric-acoustic transducer due to carelessness or deliberately, for example, in a falling impact test for testing the durability thereof, the plate spring 18 for supporting the magnetic circuit 14 may not withstand the load of the magnetic circuit 14, which moves according to the law of inertia, so that the elastic actuation of the plate spring 18 may exceed its elastic limit. In this case, there is a possibility of interference between the magnetic circuit 14, the coil 11 and the diaphragm 12. [84] However, in the present invention, as shown in the drawings, even if the plate spring
18 cannot withstand the load of the magnetic circuit 14 and the elastic actuation thereof exceeds the elastic limit, because the stopper 19a of the rivet pin 19 stops the magnetic circuit 14 and thus prevents the movement of the magnetic circuit 14 from exceeding its elastic limit, the plate spring 18 can be prevented from being deformed.
[85] As such, the stopper of the rivet pin realizes a construction for preventing the movement of the magnetic circuit 14 from exceeding the elastic limit with respect to the direction towards the diaphragm 12. With regard to the direction opposite the diaphragm 12, the inner surface of the casing 20 serves to prevent the movement of the magnetic circuit 14 from exceeding the elastic limit.
[86] Furthermore, in the structure holding the magnetic circuit 14 of the electric-acoustic transducer 10 of the present invention, the circumferential outer surface of the plate spring 18 extends in one direction and covers the circumferential outer surface of the magnetic circuit 14, which is seated on the plate spring 18. In addition, the extending edge of the plate spring 18 is bent so as to compress and thus firmly hold the magnetic circuit 14.
[87] Here, the circumferential outer surface of the plate spring 18 may be the circumferential outer surface of the support rim 18b.
[88] In addition, a stepped part is formed in the circumferential outer edge of the upper surface of the top plate 17, which is disposed at the uppermost position of the magnetic circuit 14, so that the bent outer edge of the plate spring 18 is brought into close surface contact with the stepped part of the top plate 17. Preferably, the stepped part, which is formed in the circumferential outer edge of the upper surface of the top plate 17, has a depth corresponding to the thickness of the plate spring 18. The reason for this is that, if the bent edge of the plate spring 18, which is brought into close contact with the upper surface of the top plate 17, is level with the surface of the top plate 17, the leakage of magnetic flux can be prevented.
[89] As such, the yoke 15, the magnet 16 and the top plate 17, which constitute the magnetic circuit 14, are compressed and thus held by the circumferential surface of the support rim 18b and the outer edge thereof, which is bent onto the top plate 17.
[90] Therefore, the yoke 15, the magnet 16 and the top plate 17, which constitute the magnetic circuit 14, can be firmly fixed at the correct positions without using an adhesive or welding.
[91] Meanwhile, in the electric- acoustic transducer 10 of the present invention, as shown in FIG. 13, partial support protrusions 13f, which protrude to form a dashed line shape, may be provided on each of the central portion of one surface of a plate spring 13 and the outer edge of the other surface thereof. In this case, notches 1 Ib and 12a are respectively formed in a coil 11 and a diaphragm 12, which are seated onto the cor- responding partial support protrusions 13f, at positions corresponding to the partial support protrusions 13f such that the partial support protrusions 13f are fitted into the corresponding insert notches l ib and 12a.
[92] Here, the partial support protrusions 13f substitute for the above-mentioned annular support protrusion 13a and second annular support protrusion 13e. The partial support protrusions 13f may substitute for both the annular support protrusion 13a and the second annular support protrusion 13e or, alternatively, one thereof may substitute for only one of them, as necessary.
[93] In this case, when the coil 11 or the diaphragm 12 is coupled to the plate spring 13, the partial support protrusions 13f of the plate spring 13 engage with the notches 1 Ib or 12a of the coil 11 or the diaphragm 12, so that the coil 11 or the diaphragm 12 can be easily disposed at the correct position. As well, the coil 11 or the diaphragm 12 can be guided such that it is coupled to the plate spring 13 in the correct direction.
[94] Meanwhile, as shown in FIG. 14, an acoustic transducer 10 according to another embodiment of the present invention includes a diaphragm 12, which is provided with a coil 11 fastened to the central portion of one surface of the diaphragm 12 and is supported at the outer edge thereof by an open end of a casing 20. The acoustic transducer 10 further includes a magnetic circuit 14. The magnetic circuit 14 includes a yoke 15, a magnet 16 and a top plate 17 to form magnetic flux when alternating current signals are applied to the coil 11. The acoustic transducer 10 further includes a plate spring 18, which elastically supports the magnetic circuit 14 in the casing 20, so that the electric-acoustic transducer 10 outputs sound using the vibration of the diaphragm 12 and generates vibrating force using the vibration of the magnetic circuit 14. The central portion of the bottom of the casing 20 protrudes to a predetermined height. The central portion of a plate spring 18, the lower surface of which is level, is placed on the upper surface of the protruding central portion of the bottom of the casing 20. The central portion of the plate spring 18 and the protruding central portion of the bottom of the casing 20 are fitted over the lower end of a rivet pin, which is provided at an upper end thereof with a stopper 19a, such that they are compressed and held by the rivet pin. The yoke 15, which has an opening in the center thereof, and the lower surface of which is inclined upwards from the outer edge thereof to the inner edge, is placed on the upper surface of the plate spring 18. The ring-shaped magnet 16 and the ring-shaped top plate 17 are placed on the central portion and the perimeter of the upper surface of the yoke 15, such that a gap, in which the coil 11 is disposed, is defined in the magnet 16 and the top plate 17. An extending circumferential outer surface of the plate spring 18 covers both the circumferential outer surface of the yoke 15 and the circumferential outer surfaces of the magnet 16 and the top plate 17, which are disposed on the perimeter of the yoke 15, and is bent onto the upper surface of the top plate 17 to compress and hold the yoke 15, the magnet 16 and the top plate 17. A support member 13, which is provided on the circumferential outer edge of one surface thereof with an annular support protrusion 13e for seating and supporting the diaphragm 12 at the correct position and is provided on the other surface thereof with an annular support protrusion 13a for seating and supporting the coil 11 at the correct position, is seated on the inner surface of the open end of the casing 20.
[95] In this embodiment, because the plate spring 18 is fastened to the protruding central portion of the casing 20, the plate spring 18 can be moved upwards or downwards at a position higher than the bottom in the casing 20. Furthermore, because the lower surface of the yoke 15 is inclined, when the plate spring 18 is moved downwards, the yoke 15 can also be moved downwards without interfering with the plate spring 18.
[96] The present invention described above is an electric-acoustic transducer (a signal output device), such as a speaker, a receiver, a buzzer, a vibrator, etc. The case in which the above-mentioned device is applied to an earphone or a speaker system must also be regarded as falling with the scope of the present invention. For example, in the case where the casing 20 is applied to an earphone casing, the present invention can be used as an earphone.
[97] Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. Such modifications, additions and substitutions must be regarded as falling within the bounds of the claims of the present invention.

Claims

Claims
[1] A diaphragm for electric-acoustic transducers, which is fastened at a central portion thereof to one surface of a coil (11) and is supported at an outer edge thereof by an open end of a casing (20), so that the diaphragm (12) vibrates in response to a magnetic flux, which is formed in a gap defined by a yoke (15), a magnet (16) and a top plate (17), depending on an alternating current signal applied to the coil (11), the diaphragm (12) comprising: a support member (13) fastened to one surface of the diaphragm (12) to prevent the diaphragm (12) from excessively sensitively reacting to an external force; and a first annular support protrusion (13a) provided on a central portion of a first surface of the support member (13) to maintain the coil (11) at a correct position.
[2] The diaphragm for electric-acoustic transducers according to claim 1, wherein the support member (13) is a thin plate spring made of metal.
[3] The diaphragm for electric-acoustic transducers according to claim 1, wherein the support member (13) is a plate spring, comprising rims (13b) and (13c), which respectively form a central portion and an outer portion of the plate spring, the center rim (13b) and the outer rim (13c) being integrally coupled to each other by elastic ribs (13d).
[4] The diaphragm for electric-acoustic transducers according to claim 1, wherein the support member (13) is a plate spring, comprising rims (13b) and (13c), which respectively form a central portion and an outer portion of the plate spring, the center rim (13b) and the outer rim (13c) being integrally coupled to each other by elastic ribs (13d), wherein the first annular support protrusion (13a) protrudes from a circumferential inner edge of the center rim (13b) in one direction.
[5] The diaphragm for electric-acoustic transducers according to claim 4, wherein the first annular support protrusion (13a) protrudes from a circumferential outer edge of the center rim (13b) in one direction.
[6] The diaphragm for electric-acoustic transducers according to claim 4, wherein the first annular support protrusion (13a) protrudes from each of the circumferential inner and outer edges of the center rim (13b) in one direction.
[7] The diaphragm for electric-acoustic transducers according to claim 1, wherein a second annular support protrusion (13e) is provided on a circumferential outer edge of a second surface of the support member (13) to maintain the diaphragm (12) at a correct position.
[8] An electric-acoustic transducer, comprising: a diaphragm (12) provided with a coil (11) fastened to a central portion of one surface of the diaphragm (12), the diaphragm (12) being supported at an outer edge thereof by an open end of a casing (20); a magnetic circuit (14), including a yoke (15), a magnet (16) and a top plate (17) for forming a magnetic flux in response to an alternating current signal applied to the coil (11); and a plate spring (18) for elastically supporting the magnetic circuit (14) in the casing (20), so that a sound is output by vibration of the diaphragm (12), and a vibrating force is generated by vibration of the magnetic circuit (14), the electric-acoustic transducer (10) further comprising: a support member (13) fastened to the one surface of the diaphragm (12) to prevent the diaphragm (12) from excessively sensitively reacting to an external force; and an annular support protrusion (13a) provided on a central portion of a first surface of the support member (13) to maintain the coil (11) at a correct position.
[9] The electric-acoustic transducer according to claim 8, wherein the support member (13) comprises a thin plate spring made of metal and has a structure, in which rims (13b) and (13c) respectively form a central portion and an outer portion of the support member (13), and the center rim (13b) and the outer rim (13c) are integrally coupled to each other by elastic ribs (13d).
[10] The electric-acoustic transducer according to claim 8, wherein the support member (13) is adhered to a planar part of a perimeter of a central dome part of the diaphragm (12) and to a planar part of a perimeter of the diaphragm (12).
[11] The electric-acoustic transducer according to claim 8, wherein the support member (13) is adhered to an entire area of the diaphragm (12).
[12] The electric-acoustic transducer according to claim 8, wherein the support member (13) is made of a thin metal plate that substitutes for the diaphragm (12).
[13] The electric-acoustic transducer according to claim 8, wherein the yoke (15) of the magnetic circuit (14) comprises a plate having an opening in a center thereof.
[14] The electric-acoustic transducer according to claim 8, wherein a protrusion is provided on at least one selected from a central portion and a circumferential outer edge of the yoke (15) of the magnetic circuit (14), the protrusion having a same height as a height of the magnet (16) and the top plate (17), so that a gap is defined by the yoke (15), the magnet (16) and the top plate (17).
[15] The electric-acoustic transducer according to claim 8, wherein the magnet (16) of the magnetic circuit 14 comprises: a first magnet body disposed on a central portion of the yoke (15), the first magnet body having a circular block shape; and a second magnet body surrounding the first magnet at a position spaced apart from the first magnet body by a predetermined distance, the second magnet body having a ring shape.
[16] The electric-acoustic transducer according to claim 8, wherein the magnet (16) of the magnetic circuit (14) has one shape selected from between a circular shape and a ring shape, and is seated on the yoke (15).
[17] The electric-acoustic transducer according to claim 8, wherein the plate spring
(18) comprises: a fastening rim (18a) fastened to a central portion of an inner surface of the casing (20) using a rivet pin (19), a support rim (18b) for holding and supporting the magnetic circuit (14); and an elastic part (18c) extending from the fastening rim (18a) in a planar shape and coupling the support rim (18b) to the fastening rim (18a) to elastically support the magnetic circuit (14).
[18] The electric-acoustic transducer according to claim 17, wherein the fastening rim
(18a) is fastened to the central portion of the inner surface of the casing (20) by the rivet pin 19, which is fitted into the fastening rim (18a).
[19] The electric-acoustic transducer according to claim 17, wherein the support rim
(18b) covers and holds a circumferential outer surface of a layered body, including the yoke (15), the magnet (16) and the top plate (17).
[20] The electric-acoustic transducer according to claim 17, wherein the elastic part
(18c) is a remaining part of a surface between the fastening rim (18a) and the support rim (18b) after a part of the surface between the fastening rim (18a) and the support rim (18b) is cut away, an area of the cut part being greater than an area of the remaining part, the elastic part (18c) having a spiral shape.
[21] The electric-acoustic transducer according to claim 17, wherein the elastic part
(18c) is inclined at a predetermined angle such that the support rim (18b) is disposed higher than the fastening rim (18a).
[22] The electric-acoustic transducer according to claim 8, wherein the diaphragm
(12) vibrates at a resonance frequency ranging from 300Hz to 20KHz.
[23] The electric-acoustic transducer according to claim 8, wherein the diaphragm
(12) vibrates at a resonance frequency of 300Hz.
[24] The electric-acoustic transducer according to claim 8, wherein the magnetic circuit (14) vibrates at a resonance frequency ranging from 100Hz to 200Hz.
[25] The electric-acoustic transducer according to claim 8, wherein the magnetic circuit (14) vibrates at a resonance frequency of 175Hz.
[26] The electric-acoustic transducer according to claim 8, wherein each of the magnet (16) and the top plate (17) has an opening in a center thereof, and an end of the rivet pin (19), which is fitted into a central portion of an inner surface of the casing (20), extends and passes through the yoke (15), the magnet (16) and the top plate (17), wherein a stopper (19a) is provided on the end of the rivet pin
(19) to prevent elastic actuation of the plate spring (18), which supports the magnetic circuit (14), from exceeding an elastic limit.
[27] The electric-acoustic transducer according to any one of claims 8 and 26, wherein a circumferential outer surface of the plate spring (18) extends and covers a circumferential outer surface of the magnetic circuit (14), which is seated on the plate spring (18), wherein the extending edge of the plate spring (18) is bent to compress and hold the magnetic circuit (14).
[28] The electric-acoustic transducer according to any one of claims 8 and 26, wherein partial support protrusions (13f) are provided on each of a central portion of a first surface of the plate spring (13) and of an outer edge of a second surface of the plate spring (13), the partial support protrusions (13f) forming a dashed line shape, and wherein notches (1 Ib) and (12a) are respectively formed in the coil (11) and the diaphragm (12), which are seated on the corresponding partial support protrusions (13f), at positions corresponding to the partial support protrusions (13f).
[29] An electric-acoustic transducer, comprising: a diaphragm (12) provided with a coil (11) fastened to a central portion of one surface of the diaphragm (12), the diaphragm (12) being supported at an outer edge thereof by an open end of a casing (20); a magnetic circuit (14), including a yoke (15), a magnet (16) and a top plate (17) for forming a magnetic flux in response to an alternating current signal applied to the coil (11); and a plate spring (18) for elastically supporting the magnetic circuit (14) in the casing (20), so that a sound is output by vibration of the diaphragm (12), and a vibrating force is generated by vibration of the magnetic circuit (14), wherein: a central portion of a bottom of the casing (20) protrudes to a predetermined height; a central portion of a plate spring (18), a lower surface of which is level, is placed on an upper surface of the protruding central portion of the bottom of the casing (20); the central portion of the plate spring (18) and the protruding central portion of the casing (20) are fitted over a lower end of a rivet pin, which is provided at an upper end thereof with a stopper (19a), such that the central portion of the plate spring (18) and the protruding central portion of the casing (20) are compressed and held by the rivet pin; the yoke (15) is placed on an upper surface of the plate spring (18), the yoke (15) having an opening in a center thereof and a lower surface inclined upwards from an outer edge thereof to an inner edge; the magnet (16), having a ring shape, and the top plate (17), having a ring shape, are placed on a central portion and a perimeter of an upper surface of the yoke (15), such that a gap, in which the coil (11) is disposed, is defined in the magnet (16) and the top plate (17); an extending circumferential outer surface of the plate spring (18) covers both a circumferential outer surface of the yoke (15) and circumferential outer surfaces of the magnet (16) and the top plate (17), which are disposed on the perimeter of the yoke (15), and is bent onto an upper surface of the top plate (17) to compress and hold the yoke (15), the magnet (16) and the top plate (17); and a support member (13) is seated onto an inner surface of an open end of the casing (20), with an annular support protrusion (13e) on a circumferential outer edge of a first surface of the support member (13), the annular support protrusion (13e) maintaining and supporting the diaphragm (12) at a correct position, and an annular support protrusion (13a) provided on a second surface of the support member (13), the annular support protrusion (13a) maintaining and supporting the coil (11) at a correct position.
[30] The electric-acoustic transducer according to any one of claims 1, 8, 26 and 29, wherein the casing (20) comprises an earphone body.
PCT/KR2008/001610 2007-12-26 2008-03-21 Diaphragm of the electronic sounder and the electronic sound which has the diaphragm WO2009082060A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN200880004862.4A CN101606396B (en) 2007-12-26 2008-03-21 Diaphragm of the electronic sounder and the electronic sound which has the diaphragm

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020070137772A KR100824436B1 (en) 2007-12-26 2007-12-26 Diaphragm of the electronic sounder and the electronic sound which has the diaphragm
KR10-2007-0137772 2007-12-26

Publications (1)

Publication Number Publication Date
WO2009082060A1 true WO2009082060A1 (en) 2009-07-02

Family

ID=39572309

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2008/001610 WO2009082060A1 (en) 2007-12-26 2008-03-21 Diaphragm of the electronic sounder and the electronic sound which has the diaphragm

Country Status (3)

Country Link
KR (1) KR100824436B1 (en)
CN (1) CN101606396B (en)
WO (1) WO2009082060A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100315899A1 (en) * 2009-06-16 2010-12-16 Baker Hughes Incorporated Self-stabilizing dynamic diaphragm for broad bandwidth acoustic energy source
US20110278962A1 (en) * 2010-05-14 2011-11-17 Samsung Electro-Mechanics Co., Ltd. Linear vibrator
EP2770752A3 (en) * 2013-02-22 2014-11-12 Em-tech. Co., Ltd. Inner ring magnet type microspeaker
DE102013210708A1 (en) * 2013-06-07 2014-12-11 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Belleville spring transducers
JP2016529829A (en) * 2013-08-21 2016-09-23 イェイル エレクトロニクス カンパニー，リミテッド Sensory signal output device

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100878249B1 (en) * 2008-05-01 2009-01-12 주식회사 예일전자 Sensory signal output apparatus
CN103561368A (en) * 2008-05-01 2014-02-05 株式会社礼一电子 Sensory signal output apparatus
KR100894656B1 (en) * 2008-05-01 2009-04-24 주식회사 예일전자 Sensory signal output apparatus
KR100967409B1 (en) * 2008-07-11 2010-07-01 주식회사 예일전자 Sensory signal output apparatus
KR101042032B1 (en) 2009-03-11 2011-06-16 주식회사 비에스이 Micro-speaker
CN102240226B (en) 2010-05-13 2014-04-09 深圳市理邦精密仪器股份有限公司 Patient monitoring device with recreation function and control method thereof
KR101570366B1 (en) 2014-03-10 2015-11-19 주식회사 예일전자 Sensory signal output apparatus
CN106576206A (en) * 2014-07-29 2017-04-19 礼电子有限公司 Sensory signal output apparatus
CN110198510B (en) * 2018-02-26 2022-04-15 歌尔股份有限公司 Sound generator
KR101948826B1 (en) * 2018-04-26 2019-05-02 박래범 Diaphragm

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4403117A (en) * 1981-06-04 1983-09-06 Polaroid Corporation Sonic transducer having diaphragm tensioning spring directly attached to diaphragm
JP2002135888A (en) * 2000-10-23 2002-05-10 Pioneer Electronic Corp Diaphragm for speaker
JP2003333690A (en) * 2002-05-10 2003-11-21 Matsushita Electric Ind Co Ltd Loudspeaker
KR100419915B1 (en) * 2002-08-30 2004-02-25 주식회사 진영음향 Dynamic micro speaker with dual suspension

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200171642Y1 (en) 1997-07-02 2000-03-02 김충지 A diaphragm for speaker
KR20000008356U (en) * 1998-10-20 2000-05-15 허훈 Diaphragm coupling structure of dynamic speaker
CN2626168Y (en) * 2003-03-28 2004-07-14 浙江新嘉联电子股份有限公司 Doublefaced moving-coil type electroacoustic convertor
KR100558452B1 (en) 2004-01-19 2006-03-10 삼성전기주식회사 A device for generating the sound

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4403117A (en) * 1981-06-04 1983-09-06 Polaroid Corporation Sonic transducer having diaphragm tensioning spring directly attached to diaphragm
JP2002135888A (en) * 2000-10-23 2002-05-10 Pioneer Electronic Corp Diaphragm for speaker
JP2003333690A (en) * 2002-05-10 2003-11-21 Matsushita Electric Ind Co Ltd Loudspeaker
KR100419915B1 (en) * 2002-08-30 2004-02-25 주식회사 진영음향 Dynamic micro speaker with dual suspension

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100315899A1 (en) * 2009-06-16 2010-12-16 Baker Hughes Incorporated Self-stabilizing dynamic diaphragm for broad bandwidth acoustic energy source
US8441889B2 (en) * 2009-06-16 2013-05-14 Baker Hughes Incorporated Self-stabilizing dynamic diaphragm for broad bandwidth acoustic energy source
US20110278962A1 (en) * 2010-05-14 2011-11-17 Samsung Electro-Mechanics Co., Ltd. Linear vibrator
EP2770752A3 (en) * 2013-02-22 2014-11-12 Em-tech. Co., Ltd. Inner ring magnet type microspeaker
US9185494B2 (en) 2013-02-22 2015-11-10 Em-Tech Co., Ltd. Inner magnet type microspeaker
DE102013210708A1 (en) * 2013-06-07 2014-12-11 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Belleville spring transducers
DE102013210708B4 (en) * 2013-06-07 2015-01-22 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Belleville spring transducers
JP2016529829A (en) * 2013-08-21 2016-09-23 イェイル エレクトロニクス カンパニー，リミテッド Sensory signal output device

Also Published As

Publication number Publication date
CN101606396B (en) 2013-04-24
CN101606396A (en) 2009-12-16
KR100824436B1 (en) 2008-04-23

Similar Documents

Publication Publication Date Title
WO2009082060A1 (en) Diaphragm of the electronic sounder and the electronic sound which has the diaphragm
US7961553B2 (en) Sensory signal output apparatus
US6529611B2 (en) Multifunction acoustic device
US7791456B2 (en) Vibrator
US6377145B1 (en) Vibration actuator having magnetic circuit elastically supported by a spiral damper with increased compliance
US7576462B2 (en) Electromagnetic exciter
US20050276434A1 (en) Dynamic exciter and loudspeaker using the same
US6741721B2 (en) Informing apparatus for mobile communication apparatus
JP4475993B2 (en) Multi-function vibration actuator and portable terminal device
US7684586B2 (en) Dual voice coil speaker
US20080063234A1 (en) Electroacoustic transducer
US20110129112A1 (en) Exciter apparatus
GB2076257A (en) Electro-acoustic transducers
US20110155501A1 (en) Diaphragm for electroacoustic transducer
KR101496668B1 (en) Transducer device and method of assembling the same
JP3668042B2 (en) Notification device
JP4355242B2 (en) Multi-function vibration actuator and portable terminal device
JP2006340185A (en) Speaker
JP2008244710A (en) Electroacoustic transducer
EP0289264B1 (en) Electromagnetic sounding device
US9398375B2 (en) Electrodynamic electroacoustic transducer, diaphragm thereof, and method of manufacturing the same
KR100977880B1 (en) Diaphragm of the electronic sounder
JP2012175240A (en) Electrodynamic exciter
KR20230145617A (en) Actuator for generating sound and vibration
JP3100833U (en) Thin speaker with corrugation

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 200880004862.4

Country of ref document: CN

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 08723646

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 08723646

Country of ref document: EP

Kind code of ref document: A1