US3230319A - Dynamic ear phone - Google Patents

Dynamic ear phone Download PDF

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US3230319A
US3230319A US282998A US28299863A US3230319A US 3230319 A US3230319 A US 3230319A US 282998 A US282998 A US 282998A US 28299863 A US28299863 A US 28299863A US 3230319 A US3230319 A US 3230319A
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diaphragm
air
means fastening
voice coil
chamber
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US282998A
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Kliewer Donald Leroy
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Plastic Mold & Engineering Co
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Plastic Mold & Engineering Co
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Priority to US282998A priority Critical patent/US3230319A/en
Priority to US380147A priority patent/US3329777A/en
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    • 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
    • H04R7/122—Non-planar diaphragms or cones comprising a plurality of sections or layers
    • 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
    • H04R9/10—Telephone receivers

Definitions

  • This invention rel-ates to dynamic ear phones and more particularly to a diaphragm which is provided with a rigid medial auxiliary batten.
  • One object of the present invention is to eliminate the vibrations of the diaphragm which interfere with the tonal qualities of the diaphragm.
  • Still another object of the present invention is to have the outer circumferential area of the diaphragm produce low frequency sound waves while the stiffened medial area of the diaphragm produces high frequency sound waves.
  • the present invention overcomes this undesirable condition through a structure which provides a stiff auxiliary membrane attached to the medial area of the diaphragm with entrapped air between the stiff auxiliary membrane and diaphragm.
  • the prior art discloses a stiff auxiliary membrane inserted into a medial area orifice in the diaphragm.
  • the present construction encompasses a stiff membrane attached in the medial area of the diaphragm and united by means of the peripheral area of the stiff membrane. There is entrapped air between the membrane and diaphragm.
  • the present invention contemplates a primary and a secondary medial diaphragm construction and not a single thick medial diaphragm.
  • FIGURE 1 is a vertical medial sectional view through the new and improved dynamic ear phone.
  • FIGURE 2 is a view similar to FIGURE 1, taken in a vertical plane at right angles to the vertical plane of FIGURE 1.
  • FIGURE 3 is an exploded perspective view of the construction illustrated in FIGURES l and 2.
  • FIGURE 4 is a perspective view of a detail in construction of the voice coil attached to the diaphragm.
  • a circular frame generally indicated by reference numeral 11, comprising an outwardly extending circular flange 12, a circular shell 13, and a tapered body section 14 provided with a circular band 15 and a plurality of air ports 16.
  • Circular flange 12 is provided with a chamber 17 having a stepped wall which provides a guard seat 18, a diaphragm seat 19 and a sloped side 20 terminating at the axial bore 21 of shell 13.
  • a magnetic structure having inner and outer pole pieces is required. One such structure will be described. Any equivalent structure may be substituted.
  • a hollow cylindrical member, serving the function of a pole piece, is generally indicated by reference numeral 23 and comprises a cylindrical wall 24 having a bottom plate 25 and a top plate 26 provided with a central opening 27.
  • the hollow area of cylindrical member 23 is indicated by reference numeral 28.
  • Top plate 26 provides the outer pole piece for the magnetic structure and may have a circular recess 38.
  • Hollow cylindrical member or pole piece 23 is fastened in circular shell 13 by mean-s of a tight fit in axial bore 21.
  • a solid cylindrical magnet 30 is centrally disposed within hollow cylindrical member 23 and is fastened to bottom plate 25 by means of an electrically insulating cement 32.
  • Bottom plate 25 may be provided with a circular recess 31 for the purpose of holding the insulating cement 32 and to permit the cylindrical magnet 30 to be embedded therein.
  • Magnet 30 projects through central opening 27 with an air gap 33 between cylindrical magnet 30 and the side of central opening 27.
  • the magnet 30 may be termed the inner pole piece.
  • a diaphragm, generally indicated by reference numeral 40 is preferably fabricated from a membrane of polyethylene terephthalate or a co-polymer of polyvinylidine chloride.
  • a membrane of polyethylene terephthalate or a co-polymer of polyvinylidine chloride is known commercially as Mylar and the latter as Saran-Wrap.
  • Diaphragm 40 is of a shape illustrated in the drawing and consists of a general conical shape having a raised central portion or medial dome 41 and a tapering outwardly extending circular side portion 42 having a cir cular crimped area 43 which terminates in a flat rim 44.
  • a plastic, dome-shaped stiff auxiliary membrane 45 having a circular band 46 is placed over medial dome 41 with the circular band 46 fastened to said circular side portion 42 by means of a heat seal or an adhesive.
  • An air pocket 47 is formed between dome 41 and stiff auxiliary membrane 45.
  • Flat rim 44 is secured to diaphragm seat 19 by means of an adhesive.
  • the tapering outwardly extending circular side portion 42 is the area of the diaphragm which produces the low frequency sound waves.
  • the plastic, dome-shaped stiff auxiliary membrane 45 in cooperation with medial dome 41 produce the high frequency sound waves.
  • a voice coil 35 having terminal ends 36, 37 is fastened to diaphragm 40 by means of an adhesive 39.
  • Medial dome 41 assists in locating the convolutions of the voice coil in exact medial position on the diaphragm 40.
  • the exact locating of the voice coil on the diaphragm is necessary for the proper location of the voice coil in air gap 33 and the proper functioning of the voice coil and diaphragm.
  • Voice coil 35 is placed in central opening 27 surrounding cylindrical magnet 30 and within air gap 33.
  • a guard plate is provided with a plurality of perforations or air spaces 51.
  • Guard plate is preferably fabricated from metal such as aluminum and is fastened to guard seat 18 by means of a press fit.
  • the structure described supra provides a new and improved dynamic ear phone having superior tonal qualities. However, it has been found that the additional structure about to be described further adds to the tonal qualities of the ear phone.
  • a cover generally indicated by reference numeral 52, comprises a base 53, and an integrally formed circular side wall 62 provided with a peripheral edge 63 which is fastened to circular band 15.
  • a cavity 54 is formed between cover 52 and circular frame 11.
  • Diaphragm 40 divide chamber 17 into two sections. Inner or rear section 17 and outer or front section 17A.
  • Lead wires 36A, 37A are provided as extensions to terminal ends 36, 37 respectively.
  • Body section 14 is provided with two channels 70, 71.
  • Cover 52 is provided with an opening 73. Lead wires 36A, 37A are passed through opening 73 and channels 70, 71 respectively and are united, as by twisting, to ends 36, 37 respectively.
  • lead wires 36A, 37A are attached to a sound source (not shown) which provides the electrical energy to vibrate the voice coil and diaphragm.
  • a DC. magnetic field exists between magnet and top plate 26 across central opening 27.
  • the vibration of the voice coil in the DC. magnetic field creates a vibration frequency in the diaphragm 40.
  • the shape of pole piece 23 provides a path for the harnessing of the magnetic lines of force inherent in magnet 30.
  • Opening 73 is just large enough to accommodate lead wires 36A, 37A.
  • Chamber 54 is filled with atmospheric pressure air. As diaphragm 40 vibrates it moves air in front section 17A through air spaces 51 to produce sound waves. Diaphragm 40 also moves the air in rear section 17 through ports 16 into air filled chamber 54. Porous disks 60 provide a resistance to the movement of air through ports 16. Chamber 54 provides back pressure to the movement of air from ports 16 into chamber 54.
  • Applicant has produced a diaphragm which is both a tweeter and a woofer.
  • a dynamic ear phone comprising a frame having a shell provided with an axial bore, a tapered body section provided with a plurality of air ports, and a chamber having a wall provided with a diaphragm seat, a movable diaphragm of a general conical shape having a medial area and a tapering outwardly extending circular side portion, stiff auxiliary membrane, means fastening said stiif auxiliary membrane to said diaphragm at said medial area with an air space between said medial area and said stiff auxiliary membrane, a voice coil, means fastening said voice coil to said diaphragm at said medial area, a magnetic structure having inner and outer pole pieces provided with an air gap therebetween, means fastening said movable diaphragm in said diaphragm seat with said voice coil disposed within said air gap, said diaphragm being located in said chamber and dividing said chamber into two sections, means fastening said magnetic structure in said axial bore, a cover provided with a cavity,
  • a dynamic ear phone comprising a frame having a shell provided with an axial bore, a tapered body section provided with a plurality of air ports, and a chamber having a wall provided with a diaphragm seat, a movable diaphragm fabricated from a membrane of polyethylene terephthalate or a membrane of a co-polymer polyvinylidine chloride, and having a generally conical shape provided with a medial area and a tapering outwardly extending circular side portion having a circular crimped area and a flat rim, a dome-shaped stiff auxiliary membrane fabricated from plastic material, means fastening said dome-shaped stilf auxiliary membrane to said diaphragm at said medial area with an air space between said medial area and said dome-shaped stiff auxiliary membrane, a voice coil having terminal ends adapted to extend beyond said frame, means fastening said voice coil to said diaphragm at said medial area, a magnetic structure having inner and outer pole pieces provided with an air gap therebetween
  • a dynamic ear phone consisting of a circular frame having a circular shell provided with an axial bore, a tapered body section provided with a circular band and a plurality of air ports, and a chamber having a stepped wall providing a guard seat, a diaphragm seat and a sloping side terminating at said axial bore, a hollow cylindrical member pole piece comprising a cylindrical wall having a bottom plate and a top plate provided with a central opening, means fastening said hollow cylindrical member pole piece in said axial bore, a cylindrical magnet, electrically insulating means fastening said cylindrical magnet to said bottom plate with one end of said cylindrical magnet located in said central opening, a diaphragm comprising a general conical shape having a medial dome, a tapering outwardly extending circular side portion provided with a circular crimped area and a flat rim, a dome-shaped stiff auxiliary membrane means fastening said dome-shaped stiff auxiliary membrane over said medial dome and to said tapering outwardly extending circular side portion

Description

Jan. 18, 1966 .1.. KLIEWER 3,230,319
DYNAMIC EAR PHONE Filed May 24, 1965 F/G/ 44 43 42 4/ 47 46 m4 /7 /9 /&
INVENTOR. DONALD L EROV KL lEWER AWORNE) United States Patent 3,230,319 DYNAMIC EAR PHONE Donald Leroy Kliewer, East Providence, R.I., assignor to Plastic Mold 8; Engineering Co., Providence, R.I., a corporation of Rhode Island Filed May 24, 1963, Ser. No. 282,998 3 Claims. (Cl. 179115.5)
This invention rel-ates to dynamic ear phones and more particularly to a diaphragm which is provided with a rigid medial auxiliary batten.
One object of the present invention is to eliminate the vibrations of the diaphragm which interfere with the tonal qualities of the diaphragm.
And still another object of the present invention is to have the outer circumferential area of the diaphragm produce low frequency sound waves while the stiffened medial area of the diaphragm produces high frequency sound waves.
In the past the surface of the diaphragm reacted with a wave producing motion so that more than one sound was produced. The secondary or excess sound waves are undesirable because they produce sound waves which interfere with the primary sound wave and thereby interfere with the tonal quality of the primary sound wave.
The present invention overcomes this undesirable condition through a structure which provides a stiff auxiliary membrane attached to the medial area of the diaphragm with entrapped air between the stiff auxiliary membrane and diaphragm.
The prior art discloses a stiff auxiliary membrane inserted into a medial area orifice in the diaphragm. The present construction encompasses a stiff membrane attached in the medial area of the diaphragm and united by means of the peripheral area of the stiff membrane. There is entrapped air between the membrane and diaphragm. The present invention contemplates a primary and a secondary medial diaphragm construction and not a single thick medial diaphragm.
Other objects of the present invention will be pointed out in part and become apparent in part in the following specification and claims.
Referring to the drawings in which similar characters of reference indicate corresponding parts in all the figures:
FIGURE 1 is a vertical medial sectional view through the new and improved dynamic ear phone.
FIGURE 2 is a view similar to FIGURE 1, taken in a vertical plane at right angles to the vertical plane of FIGURE 1.
FIGURE 3 is an exploded perspective view of the construction illustrated in FIGURES l and 2.
FIGURE 4 is a perspective view of a detail in construction of the voice coil attached to the diaphragm.
In proceeding with this invention there is provided a circular frame, generally indicated by reference numeral 11, comprising an outwardly extending circular flange 12, a circular shell 13, and a tapered body section 14 provided with a circular band 15 and a plurality of air ports 16.
Circular flange 12 is provided with a chamber 17 having a stepped wall which provides a guard seat 18, a diaphragm seat 19 and a sloped side 20 terminating at the axial bore 21 of shell 13.
A magnetic structure having inner and outer pole pieces is required. One such structure will be described. Any equivalent structure may be substituted.
A hollow cylindrical member, serving the function of a pole piece, is generally indicated by reference numeral 23 and comprises a cylindrical wall 24 having a bottom plate 25 and a top plate 26 provided with a central opening 27. The hollow area of cylindrical member 23 is indicated by reference numeral 28. Top plate 26 provides the outer pole piece for the magnetic structure and may have a circular recess 38.
Hollow cylindrical member or pole piece 23 is fastened in circular shell 13 by mean-s of a tight fit in axial bore 21.
A solid cylindrical magnet 30 is centrally disposed within hollow cylindrical member 23 and is fastened to bottom plate 25 by means of an electrically insulating cement 32. Bottom plate 25 may be provided with a circular recess 31 for the purpose of holding the insulating cement 32 and to permit the cylindrical magnet 30 to be embedded therein. Magnet 30 projects through central opening 27 with an air gap 33 between cylindrical magnet 30 and the side of central opening 27. The magnet 30 may be termed the inner pole piece.
A diaphragm, generally indicated by reference numeral 40 is preferably fabricated from a membrane of polyethylene terephthalate or a co-polymer of polyvinylidine chloride. One aspect of the former is known commercially as Mylar and the latter as Saran-Wrap.
Diaphragm 40 is of a shape illustrated in the drawing and consists of a general conical shape having a raised central portion or medial dome 41 and a tapering outwardly extending circular side portion 42 having a cir cular crimped area 43 which terminates in a flat rim 44. A plastic, dome-shaped stiff auxiliary membrane 45 having a circular band 46 is placed over medial dome 41 with the circular band 46 fastened to said circular side portion 42 by means of a heat seal or an adhesive. An air pocket 47 is formed between dome 41 and stiff auxiliary membrane 45. Flat rim 44 is secured to diaphragm seat 19 by means of an adhesive.
The tapering outwardly extending circular side portion 42 is the area of the diaphragm which produces the low frequency sound waves. The plastic, dome-shaped stiff auxiliary membrane 45 in cooperation with medial dome 41 produce the high frequency sound waves.
A voice coil 35 having terminal ends 36, 37 is fastened to diaphragm 40 by means of an adhesive 39. Medial dome 41 assists in locating the convolutions of the voice coil in exact medial position on the diaphragm 40. The exact locating of the voice coil on the diaphragm is necessary for the proper location of the voice coil in air gap 33 and the proper functioning of the voice coil and diaphragm.
Voice coil 35 is placed in central opening 27 surrounding cylindrical magnet 30 and within air gap 33.
A guard plate, generally indicated by reference numeral 50, is provided with a plurality of perforations or air spaces 51. Guard plate is preferably fabricated from metal such as aluminum and is fastened to guard seat 18 by means of a press fit.
The structure described supra provides a new and improved dynamic ear phone having superior tonal qualities. However, it has been found that the additional structure about to be described further adds to the tonal qualities of the ear phone.
A cover, generally indicated by reference numeral 52, comprises a base 53, and an integrally formed circular side wall 62 provided with a peripheral edge 63 which is fastened to circular band 15. A cavity 54 is formed between cover 52 and circular frame 11.
Silk in the form of disks 60 or any other air porous material is fastened by means of an adhesive over the ends of air ports 16 and to tapered body section 14 on cavity 54 side of air ports 16. Porous material disks 60 filter the air which passes from chamber 17 to cavity 54 through air ports 16. Cavity 54 is provided for back loading as will hereinafter appear.
Diaphragm 40 divide chamber 17 into two sections. Inner or rear section 17 and outer or front section 17A.
Lead wires 36A, 37A are provided as extensions to terminal ends 36, 37 respectively. Body section 14 is provided with two channels 70, 71. Cover 52 is provided with an opening 73. Lead wires 36A, 37A are passed through opening 73 and channels 70, 71 respectively and are united, as by twisting, to ends 36, 37 respectively.
In operation, lead wires 36A, 37A are attached to a sound source (not shown) which provides the electrical energy to vibrate the voice coil and diaphragm.
A DC. magnetic field exists between magnet and top plate 26 across central opening 27. The vibration of the voice coil in the DC. magnetic field creates a vibration frequency in the diaphragm 40. The shape of pole piece 23 provides a path for the harnessing of the magnetic lines of force inherent in magnet 30.
Opening 73 is just large enough to accommodate lead wires 36A, 37A. Chamber 54 is filled with atmospheric pressure air. As diaphragm 40 vibrates it moves air in front section 17A through air spaces 51 to produce sound waves. Diaphragm 40 also moves the air in rear section 17 through ports 16 into air filled chamber 54. Porous disks 60 provide a resistance to the movement of air through ports 16. Chamber 54 provides back pressure to the movement of air from ports 16 into chamber 54.
In this manner, the air in rear section 17 impedes the vibration of diaphragm 40 and thereby the frequency response and tonal quality of diaphragm 40.
Plastic dome-shaped stiff auxiliary membrane stiifens diaphragm 40 in the medial area whereby the frequency response of the medial area is also impeded.
It is the control of the frequency response of the medial area of the diaphragm 40 through stiff auxiliary membrane 45 and the control of the frequency response of the entire diaphragm 40 through the impedance of air in rear section 17 which provides the present structure with the ability to produce both low and high frequency responses and primary sound waves unfettered with secondary sound waves. Secondary sound waves are produced by the uncontrolled vibrations of a diaphragm.
Applicant has produced a diaphragm which is both a tweeter and a woofer.
Having shown and described a preferred embodiment of the present invention by Way of example, it should be realized that structural changes could be made and other examples given Without departing from either the spirit or scope of this invention.
What I claim is:
1. A dynamic ear phone comprising a frame having a shell provided with an axial bore, a tapered body section provided with a plurality of air ports, and a chamber having a wall provided with a diaphragm seat, a movable diaphragm of a general conical shape having a medial area and a tapering outwardly extending circular side portion, stiff auxiliary membrane, means fastening said stiif auxiliary membrane to said diaphragm at said medial area with an air space between said medial area and said stiff auxiliary membrane, a voice coil, means fastening said voice coil to said diaphragm at said medial area, a magnetic structure having inner and outer pole pieces provided with an air gap therebetween, means fastening said movable diaphragm in said diaphragm seat with said voice coil disposed within said air gap, said diaphragm being located in said chamber and dividing said chamber into two sections, means fastening said magnetic structure in said axial bore, a cover provided with a cavity, and means fastening said cover to said frame to provide back pressure on said diaphragm through one of said two sections, said plurality of air ports and said cavity.
2. A dynamic ear phone comprising a frame having a shell provided with an axial bore, a tapered body section provided with a plurality of air ports, and a chamber having a wall provided with a diaphragm seat, a movable diaphragm fabricated from a membrane of polyethylene terephthalate or a membrane of a co-polymer polyvinylidine chloride, and having a generally conical shape provided with a medial area and a tapering outwardly extending circular side portion having a circular crimped area and a flat rim, a dome-shaped stiff auxiliary membrane fabricated from plastic material, means fastening said dome-shaped stilf auxiliary membrane to said diaphragm at said medial area with an air space between said medial area and said dome-shaped stiff auxiliary membrane, a voice coil having terminal ends adapted to extend beyond said frame, means fastening said voice coil to said diaphragm at said medial area, a magnetic structure having inner and outer pole pieces provided with an air gap therebetween, means fastening said movable diaphragm through said flat rim in said diaphragm seat with said voice coil disposed within said air gap, said diaphragm being located in said chamber, thereby dividing said chamber into a front section and a rear section, means fastening said magnetic structure in said axial bore, a cover provided with a cavity, and means fastening said cover to said frame to provide back pressure on said diaphragm through said rear section, said plurality of air ports and said cavity.
3. A dynamic ear phone consisting of a circular frame having a circular shell provided with an axial bore, a tapered body section provided with a circular band and a plurality of air ports, and a chamber having a stepped wall providing a guard seat, a diaphragm seat and a sloping side terminating at said axial bore, a hollow cylindrical member pole piece comprising a cylindrical wall having a bottom plate and a top plate provided with a central opening, means fastening said hollow cylindrical member pole piece in said axial bore, a cylindrical magnet, electrically insulating means fastening said cylindrical magnet to said bottom plate with one end of said cylindrical magnet located in said central opening, a diaphragm comprising a general conical shape having a medial dome, a tapering outwardly extending circular side portion provided with a circular crimped area and a flat rim, a dome-shaped stiff auxiliary membrane means fastening said dome-shaped stiff auxiliary membrane over said medial dome and to said tapering outwardly extending circular side portion, means fastening said flat rim to said diaphragm seat, an air pocket located between said medial dome and said stiff auxiliary membrane, a voice coil provided with terminal ends, means fastening said voice coil to said diaphragm, said voice coil being located in said central opening and around said cylindrical magnet, a guard plate provided with a plurality of air pockets, means fastening said guard plate in said guard seat, a plurality of air porous disks, means fastening said plurality of air porous disks over said plurality of air ports,
- a cover provided with a base and a circular side wall hav- References Cited by the Examiner UNITED STATES PATENTS 6/1953 Levy et al 181-32 6/1958 Olson et al. l7 9l ROBERT H. ROSE, Primary Examiner.

Claims (1)

1. A DYNAMIC EAR PHONE COMPRISING A FRAME HAVING A SHELL PROVIDED WITH AN AXIAL BORE, A TAPERED BODY SECTION PROVIDED WITH A PLURALITY OF AIR PORTS, AND A CHAMBER HAVING A WALL PROVIDED WITH A DIAPHRAGM SEAT, A MOVABLE DIAPHRAGM OF A GENERAL CONICAL SHAPE HAVING A MEDIALDE AREA AND A TAPERING OUTWARDLY EXTENDING CIRCULAR SIDE PORTION, STIFF AUXILIARY MEMBRANE, MEANS FASTENING SAID STIFF AUXILIARY MEMBRANE TO SAID DIAPHRAGM AT SAID MEDIAL AREA WITH AN AIR SPACE BETWEEN SAID MEDIAL AREA AND SAID STIFF AUXILIARY MEMBRANE, A VOICE COIL, MEANS FASTENING SAID VOICE COIL TO SAID DIAPHRAGM AT SAID MEDIAL AREA, A MAGNETIC STRUCTURE HAVING INNER AND OUTER POLE PIECES PROVIDED WITH AN AIR GAP THEREBETWEEN, MEANS FASTENING SAID MOVABLE DIAPHRAGM IN SAID DIAPHRAGM SEAT WITH SAID VOICE COIL DISPOSED WITHIN SAID AIR GAP, SAID DIAPHRAGM BEING LOCATED IN SAID CHAMBER AND DIVIDING SAID CHAMBER INTO TWO SECTIONS, MEANS FASTENING SAID MAGNETIC STRUCTURE IN SAID AXIAL BORE, A COVER PROVIDED WITH A CAVITY, AND MEANS FASTENING SAID COVER TO SAID FRAME TO PROVIDE BACK PRESSURE ON SAID DIAPHRAGM THROUGH ONE OF SAID TWO SECTIONS, SAID PLURALITY OF AIR PORTS AND SAID CAVITY.
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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3555206A (en) * 1967-09-15 1971-01-12 Astatic Corp Microphone diaphragm assembly
US3560667A (en) * 1968-05-01 1971-02-02 Industrial Research Prod Inc Transducer having an armature arm split along its length
US3792526A (en) * 1971-04-21 1974-02-19 Ltv Ling Altec Inc Method of sound transducer construction
EP0022544A1 (en) * 1979-07-11 1981-01-21 Telefonbau und Normalzeit GmbH Electrodynamic transducer, in particular for telephonic apparatus
US4414436A (en) * 1982-04-19 1983-11-08 Pioneer Speaker Components, Inc. Narrow-frequency band acoustic transducer
US4507800A (en) * 1982-01-06 1985-03-26 Analog & Digital Systems, Inc. Enclosed magnet loudspeaker
US4608463A (en) * 1983-08-04 1986-08-26 International Standard Electric Corporation Electro-acoustic transducer
US20070223772A1 (en) * 2006-03-13 2007-09-27 Pioneer Corporation Speaker
US20180020292A1 (en) * 2016-07-13 2018-01-18 Mrspeakers, Llc Planar magnetic loudspeaker airflow system
USD864916S1 (en) * 2017-09-05 2019-10-29 Pioneer Corporation Speaker for automobile
USD864917S1 (en) * 2017-09-12 2019-10-29 Pioneer Corporation Speaker for automobile
US11051110B2 (en) * 2017-01-26 2021-06-29 Denso Electronics Corporation Sound generator

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2641329A (en) * 1950-05-29 1953-06-09 Univ Loudspeakers Inc Loud-speaker diaphragm with transversely arched stiffener means
US2838607A (en) * 1951-04-27 1958-06-10 Rca Corp Combination chassis and loudspeaker

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2641329A (en) * 1950-05-29 1953-06-09 Univ Loudspeakers Inc Loud-speaker diaphragm with transversely arched stiffener means
US2838607A (en) * 1951-04-27 1958-06-10 Rca Corp Combination chassis and loudspeaker

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3555206A (en) * 1967-09-15 1971-01-12 Astatic Corp Microphone diaphragm assembly
US3560667A (en) * 1968-05-01 1971-02-02 Industrial Research Prod Inc Transducer having an armature arm split along its length
US3792526A (en) * 1971-04-21 1974-02-19 Ltv Ling Altec Inc Method of sound transducer construction
EP0022544A1 (en) * 1979-07-11 1981-01-21 Telefonbau und Normalzeit GmbH Electrodynamic transducer, in particular for telephonic apparatus
US4507800A (en) * 1982-01-06 1985-03-26 Analog & Digital Systems, Inc. Enclosed magnet loudspeaker
US4414436A (en) * 1982-04-19 1983-11-08 Pioneer Speaker Components, Inc. Narrow-frequency band acoustic transducer
US4608463A (en) * 1983-08-04 1986-08-26 International Standard Electric Corporation Electro-acoustic transducer
US20070223772A1 (en) * 2006-03-13 2007-09-27 Pioneer Corporation Speaker
US20180020292A1 (en) * 2016-07-13 2018-01-18 Mrspeakers, Llc Planar magnetic loudspeaker airflow system
US10631098B2 (en) * 2016-07-13 2020-04-21 Mrspeakers, Llc Planar magnetic loudspeaker airflow system
US11051110B2 (en) * 2017-01-26 2021-06-29 Denso Electronics Corporation Sound generator
USD864916S1 (en) * 2017-09-05 2019-10-29 Pioneer Corporation Speaker for automobile
USD864917S1 (en) * 2017-09-12 2019-10-29 Pioneer Corporation Speaker for automobile

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