WO2006089382A1 - Transducteur electro-acoustique - Google Patents

Transducteur electro-acoustique Download PDF

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Publication number
WO2006089382A1
WO2006089382A1 PCT/BR2005/000145 BR2005000145W WO2006089382A1 WO 2006089382 A1 WO2006089382 A1 WO 2006089382A1 BR 2005000145 W BR2005000145 W BR 2005000145W WO 2006089382 A1 WO2006089382 A1 WO 2006089382A1
Authority
WO
WIPO (PCT)
Prior art keywords
electro
acoustic transducer
sound sources
sound
impedance
Prior art date
Application number
PCT/BR2005/000145
Other languages
English (en)
Inventor
Antonio Katsushi Fujimoto
Original Assignee
Gradiente Eletrônica S.A.
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 Gradiente Eletrônica S.A. filed Critical Gradiente Eletrônica S.A.
Publication of WO2006089382A1 publication Critical patent/WO2006089382A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/02—Spatial or constructional arrangements of loudspeakers
    • 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
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
    • H04R1/403—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers loud-speakers

Definitions

  • the present invention generally refers to an electro-acoustic transducer. More specifically, the present invention refers to an electro-acoustic transducer of small thickness, which comprises an arrangement of a plurality of sound sources of small thickness, low power and high impedance, being that the result of the power and impedance of such arrangement corresponds to the transducer's total power and impedance.
  • Electro-acoustic transducer device capable of converting an electrical signal into a mechanical vibration for reproduction of an audible sound or not.
  • - Power is the maximum electric power that can be applied in an electro-acoustic transducer, expressed in Watts (W).
  • - Impedance is the resulting measurement obtained from the sum of the dc ohm resistance and the inductance and capacitance of an electro- acoustic transducer to the passage of an electric current, expressed in ohms ( ⁇ ).
  • - Resounding cabinet or acoustic box a box manufactured in an adequate material (such as wood, thermoplastic, masonry or fiberglass) in which an electro-acoustic transducer is assembled for a determined sound resonance.
  • - Small thickness a thickness of about 5 to about 15 mm, particularly from about 7 to about 12 mm, more particularly from about 8 to about 10 mm. Not depending on accessories, frames or finishing boxes. W
  • - Low power power value comprised between about 1 and about 10 W, particularly between about 2 and about 8 W, more particularly between about 3 and about 7 W.
  • impedance value comprised between about 10 and about 100 ⁇ , particularly between about 20 and about 80 ⁇ , more particularly between about 30 and about 60 ⁇ .
  • Electro-acoustic transducers are devices that, in a general way, comprise a magnet, a coil and a vibrating membrane of paper pulp or polymeric material, for example.
  • the operating principle of electro-acoustic transducers is well known to those skilled in the art: an electric signal excites a coil that is surrounded by a magnetic field reproduced by a magnet fixed to the membrane, causing the membrane to vibrate at a determined frequency. The membrane, thus, converts the mechanical vibration into a sound wave.
  • Constructive features, size and proportions of electro-acoustic transducers may vary depending on the type of application for which they are intended, the range of frequency response, and the quality of the reproduced sound. However, regardless the type of application, there is a constant concern with the reduction of the dimensions of the electro-acoustic transducer, in particular its thickness. That is because sound and video equipment technology has been developing for a better efficiency of these speakers to and, at the same time, to occupy the least space possible. Moreover, the market desires to purchase electro-acoustic transducers of small thickness to combine them with plasma or LCD televisions, and also to enable them to be fixed onto a wall, as if they were paintings, for an aesthetic harmony with modern electronic devices, which are increasingly thinner.
  • the great limiting factor for reduction of electro-acoustic transducer thickness is usually the membrane and the magnet.
  • the membrane because it must have a good mechanical resistance to prevent deformation.
  • the membrane has a cone shaped form with a determined depth for a good sound reproduction.
  • the magnet because its size is closely associated with the power to move the membrane for an adequate power response in commercial applications.
  • North-American patents US 3,919,499 and US 4,417,172 reveal an electro-acoustic transducer in which the coils are assembled directly on a plane diaphragm divided into various sectors of different dimensions. A plurality of magnets causes the coil and diaphragm to vibrate at different frequencies.
  • the North-American patent US 4,385,210 describes an electro- acoustic transducer that uses a plane diaphragm of small thickness that is activated by a plurality of magnets spaced from each other. According to this document, there are two diaphragms, one for reproduction of low frequencies (woofer) and another for reproduction of high frequencies (tweeter). The frequency of the signal for each diaphragm is divided by a crossover.
  • the patent US 4,899,390 shows an electro-acoustic transducer of small thickness that uses a series of coils connected to at least one plane diaphragm, in association with a resounding cabinet for a good sound propagation.
  • the publication WO 91/04643 describes an electro-acoustic transducer equipped with a plane diaphragm in which an electric conductor is assembled in the form of a coil.
  • the coil assembled in the diaphragm is excited by a series of magnets that cause the diaphragm to vibrate at a determined frequency and, as a result, reproduce the sound.
  • the North-American patent US 5,539,835 reveals a plane diaphragm with regions of different densities, being that each region is responsible for the reproduction of a determined frequency.
  • these transducers of the state of the art have a complex structure, in which a plurality of magnets and/or coils is assembled directly on a single diaphragm or diaphragms of different densities or sizes for reproduction of determined frequency ranges.
  • an electro- acoustic transducer of small thickness in which there is no use of a plane diaphragm or a single diaphragm, and that provides a simpler structure in comparison with electro-acoustic transducers of small thickness of the state of the art.
  • Yet another objective of the present invention is an electro- acoustic transducer that does not require a frequency divider to separate the frequency ranges, or the use of a crossover.
  • Another objective of the present invention is an electro- acoustic transducer in which its thickness is less than or at least equal to the thickness of prior art electro-acoustic transducers.
  • an electro-acoustic transducer is formed by the assemble of at least two sound sources, which can also be electro-acoustic transducers, of small thickness, low power and high impedance.
  • a greater number of sound sources can be employed, particularly between 5 and 20 sound sources, and more particularly between 8 and 15 sound sources.
  • each sound source may vary between about 1 and about 10 W, particularly between about 2 and about 8 W, and more particularly between about 3 and about 7 W.
  • Each sound source must however have the same power.
  • the impedance range of each sound source of small thickness, lower power and high impedance may vary between about 10 and about 100 ⁇ , particularly between about 20 and about 80 ⁇ , more particularly between about 30 and about 60 ⁇ . However, the impedance of each sound source, individually, should be equal.
  • the sound sources of small thickness, low power and high impedance might be arranged on a surface that may be plane or slightly curved and that defines a panel.
  • the arrangement may vary, such as a parallel arrangement, a circular arrangement, in line, triangular, or any other arrangement deemed necessary.
  • the alignment or arrangement of the sound sources of the electro-acoustic transducer is not relevant to the present invention, although an esthetic distribution would be commercially appreciated.
  • the sound sources arranged on said panel should be spaced from each other for good reproduction of sounds of low frequency, such as frequencies of less than 200 Hz.
  • the spacing between each sound source as well as the spacing between each sound source and the end of the panel should be between about 5 and about 100 mm, particularly between about 8 and about 50 mm, and more particularly between about 10 and about 25 mm.
  • the material of the panel may also vary according to need. The following materials, for example, may be employed: wood, fiberglass, carbon fiber, polymeric materials, etc.
  • the panel's thickness may also vary according to the need, being that said thickness should not exceed 10 mm.
  • Figure 1 is a frontal schematic view of an embodiment of the electro-acoustic transducer according to the present invention
  • Figure 2 is a side schematic view of an embodiment of the electro- acoustic transducer according to the present invention.
  • Figure 3 is a scheme of the electrical circuit of an electro-acoustic transducer according to the present invention.
  • the electro-acoustic transducer (10) of the present invention is formed by the association of 10 sound sources (20- 29) mounted in a panel (30).
  • the panel (30) is intended to fix in an appropriate manner the assembly of the plurality of sound sources of small thickness, low power and high impedance.
  • the arrangement illustrated in Figure 1 is of two parallel rows, each one having 5 sound sources, totaling 10 sound sources.
  • the sound sources employed (20-29) are electro-acoustic transducers of classic construction, i.e., circular, of slightly conic membrane with coil on the rear part.
  • These transducers (20-29) have low power, e.g. 3 W, high impedance, e.g. 40 ⁇ , and low thickness, about 8 to about 10 mm.
  • These transducers (20-29) have a good frequency response in a frequency range of about 50 to about 25,000 Hz, more particularly of about 100 to about 15,000 Hz.
  • each sound source (20-29) has a power of 3 W, the total power of transducer (10) being of 30 W, i.e., a power value commercially acceptable for home and automotive applications.
  • each sound source (20-29) has an impedance of 40 ⁇ , and the total impedance of the electro-acoustic transducer
  • (10) is of 4 ⁇ , a perfectly acceptable value for home and automotive applications, which generally use electro-acoustic transducers of 4 to 8 ⁇ , and in particular cases of 2 to 16 ⁇ .
  • a panel (30) is employed to arrange the sound sources (20-29).
  • the panel (30) may be embodied with several appropriate materials, such as wood, glass fiber, carbon fiber, polymeric materials, etc. According to this embodiment, it is employed a polystyrene panel, and the sound sources are fixed therein by appropriate means, such as an adhesive.
  • the panel (30) must have an appropriate thickness for fixing the sound sources and to maintain a low vibration of the set and the small thickness transducer (10).
  • the space (b) between each sound source, as well as the space (c) between a sound source (20-29) and the panel end (30) must be appropriate for the reproduction of low frequencies, particularly frequencies under about 200 Hz.
  • the space (b) between each sound source and the space (c) between each sound source and the panel end (30) is of about 10 mm.
  • the use of the panel (30) completely eliminates the need of using resounding cabinets for electro-acoustic transducers, due to the fact that it impedes the frequencies generated by the front part (40) of the sound sources (20 to 29) to be cancelled by the frequencies generated by the rear part (50) of the sound sources (20 to 29).
  • the embodiment described herein does not reveal a finishing framework for the transducer (10) of the present invention.
  • a finishing box can be applied on the transducer (10) for aesthetics to the environment where it will be applied.
  • the finishing box is not relevant to the scope of the present invention. Therefore, the present invention overcomes the problems found in the small thickness electro-acoustic transducers of prior art, due to the elimination of resounding cabinets, for presenting a less complex construction in comparison to the thin transducers of the state of the art, and also for eliminating the need of using frequency separators, or crossover.

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)

Abstract

La présente invention concerne un transducteur électro-acoustique (10) comportant un montage constitué d’au moins deux sources sonores de faible épaisseur, de faible puissance et à haute impédance (20 - 29), disponibles dans un panneau (30), ledit montage devant obéir à la relation Pt = ΣPi et lt = li/ΣN, où Pt est la puissance totale du transducteur électro-acoustique selon la présente invention et ΣPi est la somme de la puissance individuelle de chaque source sonore (20 - 29) appliquée au montage ; et It est l’impédance totale du transducteur électro-acoustique selon la présente invention, li est l’impédance individuelle de chaque source sonore (20 - 29) et ΣN est la somme du nombre de sources sonores appliquées dans le montage.
PCT/BR2005/000145 2005-02-23 2005-07-29 Transducteur electro-acoustique WO2006089382A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BRPI0500605 BRPI0500605A (pt) 2005-02-23 2005-02-23 transdutor eletroacústico e uso de pelo menos duas fontes sonoras
BRPI0500605-8 2005-02-23

Publications (1)

Publication Number Publication Date
WO2006089382A1 true WO2006089382A1 (fr) 2006-08-31

Family

ID=36926977

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/BR2005/000145 WO2006089382A1 (fr) 2005-02-23 2005-07-29 Transducteur electro-acoustique

Country Status (2)

Country Link
BR (1) BRPI0500605A (fr)
WO (1) WO2006089382A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3919499A (en) * 1974-01-11 1975-11-11 Magnepan Inc Planar speaker
US4385210A (en) * 1980-09-19 1983-05-24 Electro-Magnetic Corporation Electro-acoustic planar transducer
US4899390A (en) * 1986-09-19 1990-02-06 Matsushita Electric Industrial Co., Ltd. Thin speaker having an enclosure within an open portion and a closed portion
WO1991004643A1 (fr) * 1989-09-22 1991-04-04 Anthony Leonard Trufitt Haut-parleurs plans
US5539835A (en) * 1992-04-09 1996-07-23 Sound Advance Systems, Inc. Planar-type loudspeaker with dual density diaphragm
US20020191808A1 (en) * 2001-01-22 2002-12-19 American Technology Corporation Single-ended planar-magnetic speaker
KR20030078450A (ko) * 2002-03-29 2003-10-08 삼성전기주식회사 초박형 평면 스피커 및 그 제조방법

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3919499A (en) * 1974-01-11 1975-11-11 Magnepan Inc Planar speaker
US4385210A (en) * 1980-09-19 1983-05-24 Electro-Magnetic Corporation Electro-acoustic planar transducer
US4899390A (en) * 1986-09-19 1990-02-06 Matsushita Electric Industrial Co., Ltd. Thin speaker having an enclosure within an open portion and a closed portion
WO1991004643A1 (fr) * 1989-09-22 1991-04-04 Anthony Leonard Trufitt Haut-parleurs plans
US5539835A (en) * 1992-04-09 1996-07-23 Sound Advance Systems, Inc. Planar-type loudspeaker with dual density diaphragm
US20020191808A1 (en) * 2001-01-22 2002-12-19 American Technology Corporation Single-ended planar-magnetic speaker
KR20030078450A (ko) * 2002-03-29 2003-10-08 삼성전기주식회사 초박형 평면 스피커 및 그 제조방법

Also Published As

Publication number Publication date
BRPI0500605A (pt) 2006-10-10

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