GB2154096A - Loudspeaker - Google Patents

Loudspeaker Download PDF

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Publication number
GB2154096A
GB2154096A GB08403282A GB8403282A GB2154096A GB 2154096 A GB2154096 A GB 2154096A GB 08403282 A GB08403282 A GB 08403282A GB 8403282 A GB8403282 A GB 8403282A GB 2154096 A GB2154096 A GB 2154096A
Authority
GB
United Kingdom
Prior art keywords
loudspeaker
diaphragm
magnet
improved loudspeaker
permanent magnet
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.)
Withdrawn
Application number
GB08403282A
Other versions
GB8403282D0 (en
Inventor
Chien Yuan Liu
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB08403282A priority Critical patent/GB2154096A/en
Publication of GB8403282D0 publication Critical patent/GB8403282D0/en
Publication of GB2154096A publication Critical patent/GB2154096A/en
Withdrawn legal-status Critical Current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; DEAF-AID SETS; 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; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/06—Arranging circuit leads; Relieving strain on circuit leads
    • 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
    • H04R9/046—Construction
    • H04R9/047—Construction in which the windings of the moving coil lay in the same plane

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

A loudspeaker comprising a frame (5), a permanent magnet (1) fixedly mounted on the frame, a diaphragm (4) supported at its circumference by the frame, and a voice coil (3) located above the permanent magnet and connected with the inner side of the diaphragm. The central portion (6) of the permanent magnet (1) is of one polarity and the outer portion (7) is of opposite polarity. <IMAGE>

Description

SPECIFICATION Improved loudspeaker The present invention relates to an improved loudspeaker and in particular to one which is simple in structure.
The loudspeaker is an apparatus for converting an electrical signal back into sound waves. The type most commonly used in the home is the dynamic loudspeaker, shown in FIG 5. As illustrated, the dynamic loudspeaker comprises a basket (90) which is fixedly attached to a first soft magnet (91) which acts as outer pole. A permanent magnet (92) is secured to the interior of the first soft magnet (91). A second soft magnet (93) served as inner pole is mounted on the permanent magnet (92). The second soft magnet (93) is designed such that a circular gap is formed between the first soft magnet (91) and the second soft magnet (93). A voice coil (94) is supported at one end by a flexible annular suspension (96) which centers the voice coil (94) in the circular gap and minimizes the resistance to axial motion.A diaphragm (95) is attached to the voice coil (94) so that it will move in unison with the voice coil (94). As a result, the diaphragm (95) will produce alternate compressions and rarefactions in the surrounding air to cause an acoustic pressure wave to be radiated from the front.
Nevertheless, the loudspeaker has suffered from the following drawbacks: 1. It is complex in structure; 2. It is difficult to produce; 3. It is very difficult to accurately mount the second soft magnet (93) on the center of the permanent magnet (92); 4. It is necessary to use the first and second soft magnets so that it is relatively large and heavy.
It is a primary object of the present invention to provide an improved loudspeaker which may obviate the above-mentioned drawbacks of the prior art loudspeaker.
It is another object of the present invention to provide an improved loudspeaker which is simple in structure.
It is still another object of the present invention to provide an improved loudspeaker which is easy to manufacture.
It is still another object of the present invention to provide an improved loudspeaker which is economic to produce.
It is a further object of the present invention to provide an improved loudspeaker which is lightweight.
It is still a further object of the present invention to provide an improved loudspeaker which is facile to assemble.
Other objects and merits and a fuller understanding of the present invention will be obtained by those having ordinary skill in the art when the following detailed description of the best mode contemplated for practicing the invention has been read in conjunction with the accompanying drawings wherein like numerals referto like or similar parts and in which: FIG. 1 is a perspective view of an improved loudspeaker embodying the present invention; FIG. 2 shows the rear side of the improved loudspeaker; FIG. 3 is a cross-sectional view of the improved loudspeaker; FIG 4 is a f?agmentary perspective view of the improved loudspeaker; and FIG. 5 is a cross-sectional view of a prior art dynamic loudspeaker.
With reference now to the drawings and in particular to FIGS. 1,2,3 and 4, the improved loudspeaker according to the present invention comprises a permanent magnet (1) which is designed so that the polarity of central portion (6) of the magnet (1) is opposite to that of outer portion (7) of the magnet (1). In other words, if the central portion (6) of the magnet (1) is the N-pole, the outer portion (7) will be the S-pole, but if the outer portion (7) of the magnet (1 ) is the S-pole, the central portion (6) of the magnet (1 ) will be the N-pole. The permanent magnet (1) is fixedly mounted on a frame (5) which is preferably made of plastic or metal. A voice coil (3) is supported at one end by a damper (not shown) mounted on the top of the permanent magnet (1 ) or is directly connected to a diaphragm (4).The two free ends (10) of the voice coil (3) are connected to two terminals (8) at the rear side of the frame (5). The diaphragm (4) is supported at its circumference by the frame (5). Then, a fixing ring (9) is mounted on the top of the frame (5) so as to fix the circumference of the diaphragm (4). It should be noted, however, that the frame (5) and the fixing ring (9) must provide necessary rigidity and strength to maintain all critical portions of the mechanism in proper alignment. This improved loudspeaker uses the electro-dynamic principle to convert electrical energy to mechanical motion. In this method, when current flows through the voice coil (3), the voice coil (3) will be moved forward and backward, according to the Fleming's rule. The direction and magnitude of the motion of the voice coil (3) rely on the direction and strength of the current therethrough.Since the diaphragm (4) is attached to the voice coil (3), it will move in unison with the voice coil (3). As a result, the motion of the diaphragm (4) will produce compression of air at the time of the forward movement of the diaphragm (4) and will produce rarefraction of air at the time of the backward movement of the diaphragm (4), thereby causing an acoustic pressure wave to be radiated from the front of the improved loudspeaker.
Although this invention has been described with a certain degree of particularity, it is understood that the present disclosure has been made by way of example only and that numerous changes in the detail of construction and the combination and arrangement of parts may be resorted to without departing from the scope and spirit of the invention as hereinafter claimed.
1. An improved loudspeaker comprising: a frame; a permanent magnet fixedly mounted on said frame;
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (6)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Improved loudspeaker The present invention relates to an improved loudspeaker and in particular to one which is simple in structure. The loudspeaker is an apparatus for converting an electrical signal back into sound waves. The type most commonly used in the home is the dynamic loudspeaker, shown in FIG 5. As illustrated, the dynamic loudspeaker comprises a basket (90) which is fixedly attached to a first soft magnet (91) which acts as outer pole. A permanent magnet (92) is secured to the interior of the first soft magnet (91). A second soft magnet (93) served as inner pole is mounted on the permanent magnet (92). The second soft magnet (93) is designed such that a circular gap is formed between the first soft magnet (91) and the second soft magnet (93). A voice coil (94) is supported at one end by a flexible annular suspension (96) which centers the voice coil (94) in the circular gap and minimizes the resistance to axial motion.A diaphragm (95) is attached to the voice coil (94) so that it will move in unison with the voice coil (94). As a result, the diaphragm (95) will produce alternate compressions and rarefactions in the surrounding air to cause an acoustic pressure wave to be radiated from the front. Nevertheless, the loudspeaker has suffered from the following drawbacks: 1. It is complex in structure; 2. It is difficult to produce; 3. It is very difficult to accurately mount the second soft magnet (93) on the center of the permanent magnet (92); 4. It is necessary to use the first and second soft magnets so that it is relatively large and heavy. It is a primary object of the present invention to provide an improved loudspeaker which may obviate the above-mentioned drawbacks of the prior art loudspeaker. It is another object of the present invention to provide an improved loudspeaker which is simple in structure. It is still another object of the present invention to provide an improved loudspeaker which is easy to manufacture. It is still another object of the present invention to provide an improved loudspeaker which is economic to produce. It is a further object of the present invention to provide an improved loudspeaker which is lightweight. It is still a further object of the present invention to provide an improved loudspeaker which is facile to assemble. Other objects and merits and a fuller understanding of the present invention will be obtained by those having ordinary skill in the art when the following detailed description of the best mode contemplated for practicing the invention has been read in conjunction with the accompanying drawings wherein like numerals referto like or similar parts and in which: FIG. 1 is a perspective view of an improved loudspeaker embodying the present invention; FIG. 2 shows the rear side of the improved loudspeaker; FIG. 3 is a cross-sectional view of the improved loudspeaker; FIG 4 is a f?agmentary perspective view of the improved loudspeaker; and FIG. 5 is a cross-sectional view of a prior art dynamic loudspeaker. With reference now to the drawings and in particular to FIGS. 1,2,3 and 4, the improved loudspeaker according to the present invention comprises a permanent magnet (1) which is designed so that the polarity of central portion (6) of the magnet (1) is opposite to that of outer portion (7) of the magnet (1). In other words, if the central portion (6) of the magnet (1) is the N-pole, the outer portion (7) will be the S-pole, but if the outer portion (7) of the magnet (1 ) is the S-pole, the central portion (6) of the magnet (1 ) will be the N-pole. The permanent magnet (1) is fixedly mounted on a frame (5) which is preferably made of plastic or metal. A voice coil (3) is supported at one end by a damper (not shown) mounted on the top of the permanent magnet (1 ) or is directly connected to a diaphragm (4).The two free ends (10) of the voice coil (3) are connected to two terminals (8) at the rear side of the frame (5). The diaphragm (4) is supported at its circumference by the frame (5). Then, a fixing ring (9) is mounted on the top of the frame (5) so as to fix the circumference of the diaphragm (4). It should be noted, however, that the frame (5) and the fixing ring (9) must provide necessary rigidity and strength to maintain all critical portions of the mechanism in proper alignment. This improved loudspeaker uses the electro-dynamic principle to convert electrical energy to mechanical motion. In this method, when current flows through the voice coil (3), the voice coil (3) will be moved forward and backward, according to the Fleming's rule. The direction and magnitude of the motion of the voice coil (3) rely on the direction and strength of the current therethrough.Since the diaphragm (4) is attached to the voice coil (3), it will move in unison with the voice coil (3). As a result, the motion of the diaphragm (4) will produce compression of air at the time of the forward movement of the diaphragm (4) and will produce rarefraction of air at the time of the backward movement of the diaphragm (4), thereby causing an acoustic pressure wave to be radiated from the front of the improved loudspeaker. Although this invention has been described with a certain degree of particularity, it is understood that the present disclosure has been made by way of example only and that numerous changes in the detail of construction and the combination and arrangement of parts may be resorted to without departing from the scope and spirit of the invention as hereinafter claimed. CLAIMS
1. An improved loudspeaker comprising: a frame; a permanent magnet fixedly mounted on said frame; a diaphragm supported at its circumference by said frame; a voice coil located above said permanent magnet and connected at one end with the inner side of said diaphragm; and a fixing ring mounted on the top of said frame so as to fix the circumference of said diaphragm.
2. An improved loudspeaker as claimed in claim 1, wherein said frame is made of plastic.
3. An improved loudspeaker as claimed in claim 1, wherein said frame is made of metal.
4. An improved loudspeaker as claimed in claim 1, wherein said permanent magnet is cylindrical in shape.
5. An improved loudspeaker as claimed in claim 1, wherein the central portion of said permanent magnet is the N-pole while the outer portion of said permanent magnet is the S-pole.
6. An improved loudspeaker as claimed in claim 1, wherein the central portion of said permanent magnet is the S-pole while the outer portion of said permanent magnet is the N-pole.
GB08403282A 1984-02-08 1984-02-08 Loudspeaker Withdrawn GB2154096A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08403282A GB2154096A (en) 1984-02-08 1984-02-08 Loudspeaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08403282A GB2154096A (en) 1984-02-08 1984-02-08 Loudspeaker

Publications (2)

Publication Number Publication Date
GB8403282D0 GB8403282D0 (en) 1984-03-14
GB2154096A true GB2154096A (en) 1985-08-29

Family

ID=10556259

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08403282A Withdrawn GB2154096A (en) 1984-02-08 1984-02-08 Loudspeaker

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GB (1) GB2154096A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2254978A (en) * 1991-04-15 1992-10-21 Chang Ching Lu Transducer assembly
EP1919253A1 (en) * 2006-10-31 2008-05-07 Sanyo Electric Co., Ltd. Electroacoustic transducer

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB869620A (en) * 1958-03-07 1961-05-31 Robert Ruben Gamzon Electroacoustic transducers
GB926277A (en) * 1960-07-18 1963-05-15 Bogen And Rich Inc Full range electroacoustic transducers
GB1418360A (en) * 1972-06-20 1975-12-17 Beer P F Electroacoustic transducer
GB1494593A (en) * 1976-01-30 1977-12-07 Sawafuji T Acoustic transducer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB869620A (en) * 1958-03-07 1961-05-31 Robert Ruben Gamzon Electroacoustic transducers
GB926277A (en) * 1960-07-18 1963-05-15 Bogen And Rich Inc Full range electroacoustic transducers
GB1418360A (en) * 1972-06-20 1975-12-17 Beer P F Electroacoustic transducer
GB1494593A (en) * 1976-01-30 1977-12-07 Sawafuji T Acoustic transducer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2254978A (en) * 1991-04-15 1992-10-21 Chang Ching Lu Transducer assembly
GB2254978B (en) * 1991-04-15 1994-08-03 Chang Ching Lu Electroacoustic transducer used in a microphone
EP1919253A1 (en) * 2006-10-31 2008-05-07 Sanyo Electric Co., Ltd. Electroacoustic transducer

Also Published As

Publication number Publication date
GB8403282D0 (en) 1984-03-14

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