GB2154096A - Loudspeaker - Google Patents
Loudspeaker Download PDFInfo
- 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- Withdrawn
Links
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
Landscapes
- 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)
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.
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 |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2154096A (en) |
Cited By (2)
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)
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 |
-
1984
- 1984-02-08 GB GB08403282A patent/GB2154096A/en not_active Withdrawn
Patent Citations (4)
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)
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 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3979566A (en) | Electromagnetic transducer | |
US3141071A (en) | Full range electroacoustic transducers | |
US6259800B1 (en) | Speaker and speaker apparatus | |
US7916890B2 (en) | Ultra low frequency transducer and loud speaker comprising same | |
US3937904A (en) | Moving magnet electroacoustic transducer | |
US4191863A (en) | Support for multi-point magnetic driver loudspeaker | |
EP1223789B1 (en) | Magnet system for loudspeakers | |
EP1173042A2 (en) | Compound loudspeaker drive unit having a magnet system | |
EP0538381A1 (en) | Loudspeaker suspension. | |
GB2154096A (en) | Loudspeaker | |
CN214544774U (en) | Bone conduction speaker and earphone with same | |
US4584438A (en) | Percussion air motor | |
CN210840042U (en) | Loudspeaker and electronic equipment with same | |
CN117336651A (en) | Speaker, speaker module and electronic equipment | |
CN212936189U (en) | Magnetic circuit system and electronic device | |
GB2364847A (en) | Magnet system for a compound loudspeaker | |
US20240098423A1 (en) | Bone conduction loudspeaker and headset including same | |
KR970000799B1 (en) | A speaker with magnetic circuit which is light | |
GB1591184A (en) | Electroacoustic transducers | |
JPS5855747Y2 (en) | Buzzer | |
KR900003717Y1 (en) | A transducer of moving-coil type | |
JPH0446498A (en) | Bi-directional electrodynamic acoustic transducer | |
JPH0226497A (en) | Electrodynamic type electric-acoustic commutator | |
CA1234619A (en) | Percussion air motor | |
KR950023205A (en) | speaker |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |