US3158697A - Two-system dynamic earphone - Google Patents

Two-system dynamic earphone Download PDF

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Publication number
US3158697A
US3158697A US185157A US18515762A US3158697A US 3158697 A US3158697 A US 3158697A US 185157 A US185157 A US 185157A US 18515762 A US18515762 A US 18515762A US 3158697 A US3158697 A US 3158697A
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US
United States
Prior art keywords
diaphragm
earphone
earpiece
reproduction
systems
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
US185157A
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English (en)
Inventor
Gorike Rudolf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AKG Acoustics GmbH
Original Assignee
AKG Akustische und Kino Geraete GmbH
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 AKG Akustische und Kino Geraete GmbH filed Critical AKG Akustische und Kino Geraete GmbH
Application granted granted Critical
Publication of US3158697A publication Critical patent/US3158697A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/10—Telephone receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/24—Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges

Definitions

  • the invention relates to an improvement in dynamic earphones and resides in that the earphone incorporates two actuating systems which are concentric relative to each other and of which suitably the inner one serves for a preferential reproduction of the high tones while the outer system serves for a preferential reproduction of the low tones, the diaphragm of the low-tone system preferably extending into the recessed earpiece.
  • each system can be optimally designed for the frequency range associated with it to achieve a substantial increase of the overall frequency range transmitted by the earphone.
  • the application of the dynamic system minimizes the non-linear distortions.
  • the low-tone diaphragm of the earphone may have a soft mounting
  • the high-tone diaphragm may have a hard mounting and may be adjoined on the rear by an air chamber of small depth. This enables a strong reproduction of the basses in conjunction with a full reproduction of the high frequencies even when the earphone is only loosely applied to the ear.
  • FIG. l of the accompanying drawing An illustrative embodiment of the invention is shown in FIG. l of the accompanying drawing, FIG. 2 being an explanatory diagram.
  • a housing 1 having an inclined dange 1a contains in the axis of the earphone the magnetic boss 3 for the hightone system including the inner diaphragm 4- and the moving coil da. This system may be surrounded by a pot-shaped part 5 of soft iron. This part of soft iron not only forms the yoke for completing the magnetic cir- 3,158,697 Patented Nov. 24, .1964
  • the yoke member 5 has a peripheral an- 5y nular rib 10 which supports the rim of the diaphragm 4 to establish a relatively stiff or hard mounting for this diaphragm for the reasons previously explained.
  • a shallow air space between diaphragm 4 and the front face of member 5 communicates through the inner annular air gap 11, receiving the voice coil 4a, with an air chamber 12 surrounding the magnetic boss 3.
  • the low-tone outer diaphragm 7, provided with a moving coil 7a in gap 14, has a rim engaging a circular step 1b ofthe housing flange 1a and is secured to this flange, eg., by an adhesive connection.
  • This iange 1a supports the rim of the diaphragm 7 through the intermediary of a corrugated suspension 13 establishing a relatively flexible or soft mounting for this diaphragm 7, .again for the reasons noted above.
  • the housing flange 1a carries at its outer rim a screw thread onto which is screwed an earpiece 8 which covers and protects .at the same time the diaphragm 7 of the low-tone system without impeding the movements of said diaphragm.
  • Earpiece 8 is formed with a central aperture 15 facing the magnetic structure 3, 5. Openings 9 leading to the atmosphere are filled in known manner by a frictional acoustic resistance material to ensure a strong reproduction of the basses even when the earphone does not tightly contact the ear.
  • An earphone provided with tWo earpieces according to the invention is particularly suitable for a reproduction of stereophonic recordings with perfect fidelity.
  • FIG. 2 shows the frequency curve of an earphone having only one diaphragm, measured on a coupler of 2 cubic centimeters.
  • the hatched yarea is that range which is improved by the earphone according to the invention having two diaphragms.
  • the pressure response of the earphone, in microbars per volt, is plotted against frequency given in cycles per second.
  • both moving coils may be disposed in a single annular air gap, as is known in loudspeakers.
  • the design of the magnetic system and the arrangement of the diaphragms may be similar to those adopted in loudspeakers.
  • the necessary reduction in the size of the elements of construction is facilitated by the progress in magnetic engineering.
  • the tuning of the diaphragms and the adjustment of the efficiency ⁇ of the individual transducers may be elfected with known electrical, mechanical or magnetic means.
  • a dynamic earphone which comprises at least one earpiece having a portion adapted to contact a human ear, said portion defining an annular cavity, said earpiece incorporting inner and outer actuating systems which are concentrically arranged relative to each other and comprise each a diaphragm and a movable coil energizable to actu-ate said diaphragm, said inner system being designed for a preferential reproduction of relatively high tones and said outer system being designed for a preferential reproduction of relatively low tones, said diaphragm of said outer system extending into said cavity.
  • a dynamic earphone as defined in claim l wherein said diaphragm of said outer system is peripherally provided with suspension means securing it to said portion Within said cavity and forming a relatively soft mounting for the last-mentioned diaphragm, said inner actuating system being provided with support means peripherally engaging the diaphragm of said inner system and forming a relatively hard mounting therefor.
  • a dynamic earphone comprising at least one earpiece having a front surface shaped to contact a human ear, a housing rigid with said earpiece on the rear side amasar n thereof, a magnetic structure in said housing forming an inner and an outer annular air gap concentrically disposed therein, an inner diaphragm spanning the central part of said structure land extending across said inner air gap, relatively stil mounting means peripherally supporting said inner diaphragm on said structure externally of said inner air gap and with slight spacing from the front of said structure whereby a shallow air space is formed rearwardly of said inner diaphragm, an outer diaphragm ⁇ overlying said inner diaphragm and extending radially therebeyond across said outer air gap, relatively llexible mounting means peripherally supporting said outer diaphragm on said housingsaid structure forming within said housing an air chamber communicating through said inner air gap with said shallow air space, a first movable voice coil on said inner diaphragm in said inner air gap
  • a dynamic earphone as defined in claim 3 wherein said earpiece partly overlies said outer diaphragm and is provided with a central aperture exposing a portion of said outer diaphragm registering with said inner diaphragm, said housing being provided with passages leading to the atmosphere at locations behind said outer diaphragm toverlain by said earpiece, said passages containing frictional acoustic resistance material.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Headphones And Earphones (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
US185157A 1961-04-28 1962-04-04 Two-system dynamic earphone Expired - Lifetime US3158697A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT335061A AT224180B (de) 1961-04-28 1961-04-28 Dynamischer Kopfhörer nach dem Zweiwegsystem

Publications (1)

Publication Number Publication Date
US3158697A true US3158697A (en) 1964-11-24

Family

ID=3549193

Family Applications (1)

Application Number Title Priority Date Filing Date
US185157A Expired - Lifetime US3158697A (en) 1961-04-28 1962-04-04 Two-system dynamic earphone

Country Status (4)

Country Link
US (1) US3158697A (de)
AT (1) AT224180B (de)
DE (1) DE1163386B (de)
GB (1) GB943321A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3943304A (en) * 1973-06-19 1976-03-09 Akg Akustische U Kino-Gerate Gesellschaft M.B.H. Headphone operating on the two-way system
US4357498A (en) * 1979-06-30 1982-11-02 Pioneer Electronic Corporation Coaxial type multi-way planar diaphragm loudspeaker system
US4497981A (en) * 1982-06-01 1985-02-05 Harman International Industries Incorporated Multi-driver loudspeaker
US4554414A (en) * 1983-04-28 1985-11-19 Harman International Industries Incorporated Multi-driver loudspeaker
US20040175016A1 (en) * 2000-07-11 2004-09-09 Kef Audio (Uk) Limited Compound loudspeaker having a magnet system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT320042B (de) * 1973-04-11 1975-01-27 Akg Akustische Kino Geraete Wenigstens zwei dynamische Wandler aufweisende Hörermuschel oder in Schaumstoff eingebettete Wandlerhalterung
GB8402229D0 (en) * 1984-01-27 1984-02-29 Tannoy Ltd Moving coil loudspeaker

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1951692A (en) * 1933-04-12 1934-03-20 Albert M Evens Loud speaker
US2122587A (en) * 1925-07-20 1938-07-05 Rca Corp Acoustic device
FR1001734A (fr) * 1946-08-13 1952-02-27 Subalpine Apparecchiature Elet Haut-parleur à large bande de fréquences et à double système vibrant

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB349630A (en) * 1929-12-03 1931-06-04 Joseph Poliakoff Improvements in loud speakers and other telephone receviers
BE538196A (de) * 1954-05-18

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2122587A (en) * 1925-07-20 1938-07-05 Rca Corp Acoustic device
US1951692A (en) * 1933-04-12 1934-03-20 Albert M Evens Loud speaker
FR1001734A (fr) * 1946-08-13 1952-02-27 Subalpine Apparecchiature Elet Haut-parleur à large bande de fréquences et à double système vibrant

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3943304A (en) * 1973-06-19 1976-03-09 Akg Akustische U Kino-Gerate Gesellschaft M.B.H. Headphone operating on the two-way system
US4357498A (en) * 1979-06-30 1982-11-02 Pioneer Electronic Corporation Coaxial type multi-way planar diaphragm loudspeaker system
US4497981A (en) * 1982-06-01 1985-02-05 Harman International Industries Incorporated Multi-driver loudspeaker
US4554414A (en) * 1983-04-28 1985-11-19 Harman International Industries Incorporated Multi-driver loudspeaker
US20040175016A1 (en) * 2000-07-11 2004-09-09 Kef Audio (Uk) Limited Compound loudspeaker having a magnet system
US20040202342A1 (en) * 2000-07-11 2004-10-14 Kef Audio (Uk) Limited Compound loudspeaker drive unit having a magnet system

Also Published As

Publication number Publication date
GB943321A (en) 1963-12-04
AT224180B (de) 1962-11-12
DE1163386B (de) 1964-02-20

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