GB1522710A - Creación de Inventos y Patentes con Inteligencia Artificial

GB1522710A – Low frequency electro-acoustic transducer assembly
– Google Patents

GB1522710A – Low frequency electro-acoustic transducer assembly
– Google Patents
Low frequency electro-acoustic transducer assembly

Info

Publication number
GB1522710A

GB1522710A
GB47691/75A
GB4769175A
GB1522710A
GB 1522710 A
GB1522710 A
GB 1522710A
GB 47691/75 A
GB47691/75 A
GB 47691/75A
GB 4769175 A
GB4769175 A
GB 4769175A
GB 1522710 A
GB1522710 A
GB 1522710A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
nodes
movable
diaphragms
fixed
Prior art date
1974-11-25
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

Application number
GB47691/75A
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.)
1974-11-25
Filing date
1975-11-19
Publication date
1978-08-23

1975-11-19
Application filed by Individual
filed
Critical
Individual

1978-08-23
Publication of GB1522710A
publication
Critical
patent/GB1522710A/en

Status
Expired
legal-status
Critical
Current

Links

Espacenet

Global Dossier

Discuss

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

H04R9/063—Loudspeakers using a plurality of acoustic drivers

Abstract

1522710 Loudspeakers; diaphragms O HEIL 19 Nov 1975 [25 Nov 1974] 47691/75 Heading H4J A low frequency loudspeaker (Fig. 2) or other transducer comprises a stack of spaced apart, generally parallel fixed diaphragms 30a … 30e and movable diaphragms 23a . . . 23f, the fixed and movable diaphragms being disposed in alternation with one another and defining therebetween a plurality of narrow air spaces, adjacent ones of the air spaces having open sides facing in opposite directions. A driver 11, in use, moves the movable diaphragms 23 towards and away from the fixed diaphragms 30. As shown, the driver 11 comprises a driving coil 19 to which are attached drive rods 21, connected along their lengths to movable diaphragms 23a to 23f. The diaphragm arrangement 12 (Fig. 2) comprises upper and lower blocks 27 and 26 in between which are disposed modular transducer assemblies 14 comprising diaphragm spacer blocks 28a to 28l connected on one side to movable diaphragm 23 and on the other side to fixed diaphragm 30, thereby defining a plurality of narrow air spaces alternately facing in opposite directions. A flexible membrane 33 is connected between spacer blocks 28 and the periphery of movable diaphragms 23. Drive rods 21 may be made from light weight rigid material such as drinking straws. Holes 34 provide for free passage through the fixed diaphragm 30. The diaphragms 23 and 30 are circular (see Fig. 3, not shown) but are in the form of two concentric conical sections to provide rigidity. To dampen longitudinal resonance in rods 21, a resilient viscous termination (43) Fig. 4 (not shown) is connected between their upper ends and upper block 27. To counteract any tendency for the unit to vibrate, two acoustic devices of Fig. 2 may be provided end to end (Fig. 2A, not shown) with the two driven units 11 connected to operate in push pull. An alternative transducer 50 (Fig. 6) uses rectangular movable diaphragms 79 and modular transducer assemblies 54 between upper and lower assemblies 51a and 51b. Each drive assembly 51a and 51b has two moving coils 60, 61. Fixed driver units 66 are provided each comprising a fixed diaphragm 68 defining a plane which divides unit 66 into upper and lower halves 69,70 with each half enclosing oppositely disposed upper and lower openings 73 and 74 on opposite sides of fixed diaphragm 68. A flexible membrane is connected between diaphragm 79 and surfaces 76 and 77. Movable diaphragm 67 comprises a plurality of alternately upward and downward protruding rigidizing nodes 81 and 82 (Fig. 8) arranged so that drive rods 63 and 64 are attached at the apex 83 or nadir 84 of each node 81, 82. Nodes 81 and 82 preferably define conic sections but may be hyperbolic paraboloids. The diaphragm 67 may be of layered cellulose fibres or paper pulp or polyethylene, acrylic or other plastics material. Fixed diaphragm unit 66 may be made by injection moulding. To achieve even greater rigidity of the movable diaphragm, two such diaphragms 67 as shown in Fig. 8 may be connected together with upward protruding nodes of the lower diaphragm attached to downward protruding nodes of the upper diaphragm (Fig. 9, not shown). Drive rods 63 and 64 connect to coils 60 and 61 and to nodes of the movable composite diaphragm. Alternatively, rigidity is obtained by moulding a conical section 105 (Fig. 10), of foamed polystyrene or other plastics, having peaks 107 and valleys 108 corresponding to the positions of the nodes of the diaphragms. The lower end of conical section 105 is attached to drive coil 110. The flexible membrane 80 (Fig. 6) or 33 (Fig. 2) may be dispensed with. In one arrangement the diaphragm 103 (Fig. 11), for use with the transducer of Fig. 6, has a peripheral reinforcing bead 115, and a lip 116 is provided, attached to acoustic barrier 71 and 72. The spacing of bead 115 from lip 116 is less than 1 mm. The length of lip 116 is determined by the maximum displacement of movable diaphragm 103. In another arrangement (Fig. 12, not shown) the movable diaphragm 103 is provided with a peripheral reinforcing wall, rather than a bead, which further rigidizes the diaphragm and provides a barrier to prevent air leaking past the lip of acoustic barriers 71 and 72. The spacing, again, should be less than 1 mm. In another arrangement (Fig. 14) a cylindrical housing 214 comprising a plurality of radially disposed, semi-cylindrical slots 215 facing in opposite directions. The movable diaphragms 223a to 223e each comprise six alternately upwardly and downwardly rigidized nodes 281 and 282 arranged in a circular array. The nodes extend upwards and downwards from a plane of the diaphragm 273. Undesirable resonances may be eliminated by straight slots (235) Fig. 15 (not shown) filled with viscous material and located between the nodes. Flag diaphragms may be of polystyrene, diameter 3 inch and weight about I gm. The section 212 of Fig. 14 may be modified so that the fixed diaphragm units 310 (Fig. 18) are of modular form which form a slack (Fig. 19, not shown). Between each adjacent pair of units 310 is disposed a movable diaphragm 223 as in Fig. 14. The fixed diaphragm unit 310 comprises a fixed plate having formed therein six equi-angularly spaced alternately upwardly and downwardly protruding nodes 314, 315 arranged in the same relative location as nodes 281, 282 of movable diaphragm 223 so that the nodes 314, 315 of the fixed diaphragm 310 will tend to nest with the nodes 281, 282 of movable diaphragm 223. At the apex of nodes 314, 315 is a hole 316 for passage of drive rods 324. A semi-cylindrical acoustic barrier 320 is terminated at each end by an upper spacer 321 and has intermediate spacers 322a, 322b. Similar barriers 320′ and spacers 3211, 322a1 and 322b1 are on the underside. The difference in height between spacers 321, 322a, 322b, and barrier 320 determine the width of slot 215 (Fig. 14).

GB47691/75A
1974-11-25
1975-11-19
Low frequency electro-acoustic transducer assembly

Expired

GB1522710A
(en)

Applications Claiming Priority (1)

Application Number
Priority Date
Filing Date
Title

US52666774A

1974-11-25
1974-11-25

Publications (1)

Publication Number
Publication Date

GB1522710A
true

GB1522710A
(en)

1978-08-23

Family
ID=24098275
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

GB47691/75A
Expired

GB1522710A
(en)

1974-11-25
1975-11-19
Low frequency electro-acoustic transducer assembly

Country Status (10)

Country
Link

JP
(1)

JPS5175430A
(en)

AU
(1)

AU499523B2
(en)

CA
(1)

CA1067201A
(en)

CH
(1)

CH607524A5
(en)

DE
(1)

DE2553070A1
(en)

DK
(1)

DK529475A
(en)

FR
(1)

FR2292393A1
(en)

GB
(1)

GB1522710A
(en)

IT
(1)

IT1052385B
(en)

SE
(1)

SE406409B
(en)

Cited By (3)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

DE19605130A1
(en)

1996-02-13
1997-08-14
Kurt Schubert
Omnidirectional electroacoustic radiator

WO2007075674A2
(en)

2005-12-21
2007-07-05
Tymphany Corporation
Linear array transducer and methods of manufacture

WO2009026994A1
(en)

2007-08-24
2009-03-05
Philip Keller
Broadband exciter

Families Citing this family (6)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

DE3929266C1
(en)

1989-09-02
1991-01-03
Mercedes-Benz Aktiengesellschaft, 7000 Stuttgart, De

SE503180C2
(en)

1994-08-29
1996-04-15
Centara Patent Ab

Electroacoustic converter

JP2008042615A
(en)

2006-08-08
2008-02-21
Sharp Corp
Speaker system

JP2008042618A
(en)

2006-08-08
2008-02-21
Sharp Corp
Speaker system

JP2008042614A
(en)

2006-08-08
2008-02-21
Sharp Corp
Speaker system

DE102014218427B4
(en)

2014-09-15
2016-06-02
Kendrion Kuhnke Automotive GmbH

Loudspeaker, in particular electrodynamic loudspeaker

1975

1975-11-19
CA
CA240,018A
patent/CA1067201A/en
not_active
Expired

1975-11-19
GB
GB47691/75A
patent/GB1522710A/en
not_active
Expired

1975-11-21
AU
AU86834/75A
patent/AU499523B2/en
not_active
Expired

1975-11-24
IT
IT52370/75A
patent/IT1052385B/en
active

1975-11-24
SE
SE7513196A
patent/SE406409B/en
unknown

1975-11-24
DK
DK529475A
patent/DK529475A/en
not_active
Application Discontinuation

1975-11-24
CH
CH1521875A
patent/CH607524A5/xx
not_active
IP Right Cessation

1975-11-24
FR
FR7535762A
patent/FR2292393A1/en
not_active
Withdrawn

1975-11-25
JP
JP50140322A
patent/JPS5175430A/en
active
Pending

1975-11-26
DE
DE19752553070
patent/DE2553070A1/en
not_active
Withdrawn

Cited By (4)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

DE19605130A1
(en)

1996-02-13
1997-08-14
Kurt Schubert
Omnidirectional electroacoustic radiator

WO2007075674A2
(en)

2005-12-21
2007-07-05
Tymphany Corporation
Linear array transducer and methods of manufacture

WO2007075674A3
(en)

2005-12-21
2007-08-16
Tymphany Corp
Linear array transducer and methods of manufacture

WO2009026994A1
(en)

2007-08-24
2009-03-05
Philip Keller
Broadband exciter

Also Published As

Publication number
Publication date

JPS5175430A
(en)

1976-06-30

DK529475A
(en)

1976-05-26

AU8683475A
(en)

1977-05-26

CA1067201A
(en)

1979-11-27

SE406409B
(en)

1979-02-05

FR2292393A1
(en)

1976-06-18

AU499523B2
(en)

1979-04-26

CH607524A5
(en)

1978-12-29

DE2553070A1
(en)

1976-05-26

IT1052385B
(en)

1981-06-20

SE7513196L
(en)

1976-05-26

Información de contacto