EP0072991A2 - Lautsprechersystem - Google Patents

Lautsprechersystem Download PDF

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Publication number
EP0072991A2
EP0072991A2 EP82107390A EP82107390A EP0072991A2 EP 0072991 A2 EP0072991 A2 EP 0072991A2 EP 82107390 A EP82107390 A EP 82107390A EP 82107390 A EP82107390 A EP 82107390A EP 0072991 A2 EP0072991 A2 EP 0072991A2
Authority
EP
European Patent Office
Prior art keywords
vibration plate
type vibration
cone type
cone
speaker
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.)
Granted
Application number
EP82107390A
Other languages
English (en)
French (fr)
Other versions
EP0072991A3 (en
EP0072991B1 (de
Inventor
Shinichiro Kawamura
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Publication of EP0072991A2 publication Critical patent/EP0072991A2/de
Publication of EP0072991A3 publication Critical patent/EP0072991A3/en
Application granted granted Critical
Publication of EP0072991B1 publication Critical patent/EP0072991B1/de
Expired 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
    • H04R9/06—Loudspeakers
    • 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 
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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

Definitions

  • This invention relates to a speaker system, and more particularly to a speaker system using a cone type in which the dip effect of the cone is decreased.
  • a buffle with an infinite size is suitable for the buffle surface of the cone type speaker.
  • a buffle with a finite plane surface has been applied.
  • cylindrical surface, spherical surface and other types are used.
  • a depression in the cone surface causes a later-mentioned so-called "dip effect" in the voice pressure-frequency characteristic and the voice pressure phase-frequency characteristic. This disturbs reproduction with high fidelity.
  • Fig. 1 the cross-section of a cone type speaker is shown to explain the "dip effect".
  • 1 and 1' denote cone type vibration plates with semi-vertical angles a and ⁇ , respectively.
  • the object of this invention is to eliminate the above-mentioned defect of the prior art and to provide a speaker system of cone type with the dip effect reduced.
  • a part of the cone type vibration plate is made to protrude above the buffle surface, or in the direction of a space to which the sound wave is radiated from the vibration plate, so that the dip and bump effects appear simultaneously in the center and outer peripheral parts respectively.
  • a dome type vibration plate with a bump effect is fixed to the cone type vibration plate so that the bump and dip effects appear in the center and outer peripheral parts respectively.
  • the complementary characteristic for the dip and bump effects is not perfect.
  • the frequency range of both the cone type and dome type vibration plates is limited in such a range where the plates may be assumed to be a point sound source on an infinite size buffle (ka ⁇ ⁇ 2)
  • a fair complementary characteristic can be obtained under the following condition: the protruded and depressed parts of the vibration plate with respect to a plane containing the buffle surface have substantially the same volume.
  • This invention makes use of the complementary characteristic in this region.
  • Fig. 3 is the cross-sectional view of a dome type vibration plate for the explanation of the bump effect as applied by this invention.
  • Fig. 4 is a diagram of the frequency characteristic of the dome type vibration plate shown in Fig. 3.
  • a reference numeral 11 denotes a speaker, 12 a cone type vibration plate (hereinafter referred to as a cone simply) and 12' a flexible edge-suspension.
  • the edge-suspension 12' may be of the same material as that of the cone 12, or of a different material therefrom. In the latter case, a part of the edge-suspension is adhered to the cone 12.
  • 12" denotes a margin part of adhering the edge-suspension 12'.
  • 13 denotes a center cap which is used to avoid the generation of noise due to invasion of dust and iron powder, etc. into the speaker 11.
  • the center cap 13 is also useful to avoid the bending vibration of the cone type vibration plate 12 and is called as a dust cap.
  • 14 denotes a frame, 14' a frame raising part, 15 a magnetic circuit, 16 a buffle plate, 16' a front surface of the buffle plate 16 (hereinafter referred to as a buffle surface simply), and 16" a virtual plane which contains the buffle surface 16' and crosses the speaker 11. Even when the buffle surface 16' is a curves surface, the surface to which the speaker 11 is fixed may be a plane.
  • the virtual surface 16" divides a group of surfaces consisting of the front surface of the cone 12, the front surface of the edge-suspension 12' and the front surface of the center cap 13 into front and rear parts.
  • the front part B contains the edge-suspension 12' while the rear part C contains the center cap 13.
  • the center cap 13 is formed by either a mesh or an apertured plate, the volume expressed by a shade is decreased by a fraction corresponding to the apertured ratio.
  • the height of the frame raising part 14' should be determined along this line.
  • the existence of the above-mentioned volume has equivalently an effect that a part of the buffle surface 16' protrudes toward the edge-suspension 12' and the margin part 12". Therefore, the effect of protruding the group of surfaces above the virtual plane 16" is to some extent cancelled.
  • the diameter of the frame raising part 14' is made infinitely large, not only the group of surfaces but also the buffle surface 16' protrude. This means that the group of surfaces do not protrude above the buffle surface 16' at all. In order to recover the cancelled part, the group of surfaces should be further protruded. If the frame 14 does not have such a frame raising part 14', an annular body similar to 14' may be separately formed and combined.
  • Fig. 7 shows the second embodiment of a speaker system according to this invention and the cross-section of the peripheral part of it.
  • a combination of a cone type vibration plate and a vibration plate with a concave surface, e.g. a dome type vibration plate the aforementioned object can be attained without protruding the frame 14 above the virtual plane 16".
  • a speaker denotes a speaker, 21 a frame, and 22 a dome type vibration plate (hereinafter referred to as a dome simply).
  • the dome 22 is fixed to the cone 12.
  • a volume @ which consists of a surface part of the dome 22 below the virtual plane 16" and a surface part of the cone 12 that is not covered with the dome 12 and lies below the virtual plane 16".
  • the volume E projected to a plane vertical to the virtual plane 16" is shown by a shade.
  • a volume F which consists of a surface part of the dome above the virtual plane 16" and is shown by another shade.
  • the mass of the dome 22 according to this method is liable to become large.
  • the strength of the cone 12 should be considerably large. A drawback of this method, therefore, is that the mass of the cone becomes easily large.
  • Fig. 8 is a diagram showing the third embodiment of a speaker system according to this invention and the cross-section of the peripheral part of it. In this embodiment, the methods of the first and second embodiments shown in Figs. 5 and 7 are commonly applied.
  • a part of the cone type vibration plate 12 is protruded above the buffle surface 16' in the direction of a space to which the sound wave is radiated from the cone type vibration plate 12, thereby to obtain a dip effect.
  • a vibration plate with a concave surface e.g. a dome type vibration plate 22
  • the cone type vibration plate is combined with the cone type vibration plate, thereby to obtain a bump effect.
  • this invention since the dip effect of a vibration plate can be decreased without using any planar vibration plate, sound pressure-frequency and sound pressure phase-frequency characteristics which can match those of a speaker system with use of a planar vibration plate can be obtained. Moreover, this invention has an effect of making the cost as low as or equal to that of a prior art speaker system using a cone type vibration plate.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
EP19820107390 1981-08-28 1982-08-13 Lautsprechersystem Expired EP0072991B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP134096/81 1981-08-28
JP13409681A JPS5838097A (ja) 1981-08-28 1981-08-28 スピ−カ・システム

Publications (3)

Publication Number Publication Date
EP0072991A2 true EP0072991A2 (de) 1983-03-02
EP0072991A3 EP0072991A3 (en) 1983-04-20
EP0072991B1 EP0072991B1 (de) 1985-07-03

Family

ID=15120337

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820107390 Expired EP0072991B1 (de) 1981-08-28 1982-08-13 Lautsprechersystem

Country Status (3)

Country Link
EP (1) EP0072991B1 (de)
JP (1) JPS5838097A (de)
DE (1) DE3264559D1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989004581A1 (en) * 1987-11-12 1989-05-18 Robert Michael Grunberg Electro-acoustic transducers
WO1999025149A3 (en) * 1997-11-06 1999-07-22 Macklaine Di Francesco Di Summ Moving-coil loudspeaker
DE102005023759B3 (de) * 2005-05-19 2006-09-14 Florat Seta Schallwandler mit Vollkonus-Membran und Vollkonusmembran

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR673659A (fr) * 1928-08-13 1930-01-17 Reproducteur de sons
US2303989A (en) * 1941-03-01 1942-12-01 Rca Corp Signal translating apparatus
US2549091A (en) * 1946-10-25 1951-04-17 Bell Telephone Labor Inc Diaphragm for electroacoustic transducers
DE899048C (de) * 1950-05-04 1953-12-07 Adelbert Stephan Lautsprecher mit kippfreier Mehrfachkonus-Membran
US3746125A (en) * 1971-09-10 1973-07-17 Lowell Mfg Co Protective speaker back-can
US3940576A (en) * 1974-03-19 1976-02-24 Schultz Herbert J Loudspeaker having sound funnelling element
JPS5251929A (en) * 1975-10-23 1977-04-26 Pioneer Electronic Corp Diaphragm for speakers
JPS5393816A (en) * 1977-01-28 1978-08-17 Hitachi Ltd Diaphragm of speaker

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989004581A1 (en) * 1987-11-12 1989-05-18 Robert Michael Grunberg Electro-acoustic transducers
WO1999025149A3 (en) * 1997-11-06 1999-07-22 Macklaine Di Francesco Di Summ Moving-coil loudspeaker
DE102005023759B3 (de) * 2005-05-19 2006-09-14 Florat Seta Schallwandler mit Vollkonus-Membran und Vollkonusmembran

Also Published As

Publication number Publication date
DE3264559D1 (en) 1985-08-08
EP0072991A3 (en) 1983-04-20
EP0072991B1 (de) 1985-07-03
JPS5838097A (ja) 1983-03-05

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