EP0404488B1 - Ribbon transducers - Google Patents

Ribbon transducers Download PDF

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Publication number
EP0404488B1
EP0404488B1 EP90306630A EP90306630A EP0404488B1 EP 0404488 B1 EP0404488 B1 EP 0404488B1 EP 90306630 A EP90306630 A EP 90306630A EP 90306630 A EP90306630 A EP 90306630A EP 0404488 B1 EP0404488 B1 EP 0404488B1
Authority
EP
European Patent Office
Prior art keywords
ribbon
cross
suspension
suspension elements
transducer according
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.)
Expired - Lifetime
Application number
EP90306630A
Other languages
German (de)
French (fr)
Other versions
EP0404488A2 (en
EP0404488A3 (en
Inventor
Graham Bank
Harold Charles Pinfold
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.)
CELESTION INTERNATIONAL Ltd
Original Assignee
CELESTION INTERNATIONAL 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 CELESTION INTERNATIONAL Ltd filed Critical CELESTION INTERNATIONAL Ltd
Publication of EP0404488A2 publication Critical patent/EP0404488A2/en
Publication of EP0404488A3 publication Critical patent/EP0404488A3/en
Application granted granted Critical
Publication of EP0404488B1 publication Critical patent/EP0404488B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H04R9/02—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
    • H04R9/048—Construction in which the windings of the moving coil lay in the same plane of the ribbon type

Definitions

  • This invention relates to ribbon transducers and is particularly concerned with the mounting of the ribbon itself, particularly in transducers for use in loudspeakers and microphones.
  • this is achieved by providing a plurality of cross-suspension elements arranged transversely to the longitudinal axis of the ribbon and to which the ribbon is secured, characterised in that each of these cross-suspension elements is capable of displacement in the direction at right-angles to the longitudinal axis of the ribbon to produce consequential lateral movement of the ribbon.
  • the cross-suspension elements comprise strips or bands of material affixed by adhesive for example to one face of the ribbon and secured at each end to support means.
  • the support means can be adjusted to effect movement of the cross-suspension elements at right-angles to the longitudinal axis of the ribbon.
  • a ribbon foil 10 which constitutes part of a ribbon transducer, for example for a loudspeaker.
  • Beneath the underside of the ribbon foil 10 lies a cross-suspension element 12.
  • This is in the form of a band or strip which is affixed, for example by adhesive, to the underside of the ribbon foil.
  • the ends of the cross-suspension element 12 are secured in suspension pillars 14a and 14b positioned one on each side of the ribbon foil so that the element 12 lies at right-angles to the longitudinal axis of the foil.
  • Each of the suspension pillars 14a, 14b is provided with a slot in the end thereof, so that the pillars can be rotated, for example with a screwdriver.
  • the suspension pillars 14a, 14b are mounted on rear and front extrusion plates 16a and 16b respectively so that they can be rotated relative to the support plates and will hold their adjusted positions.
  • the front and rear extrusion plates 16a, 16b also serve as support plates for magnets 18 which are held in place by backing plates 20.
  • the ribbon foil 10 is provided with a plurality of cross-suspension elements 12 at intervals along its length so that the foil can be accurately centered throughout its length.
  • the cross-suspension element 12 could be mounted between the two limbs 22, 23 of a generally U-shaped support member 24, for example a plastics moulding. Adjustment means would then be provided for moving the cross-suspension element 12 relative to the U-shaped support 24.
  • the U-shaped support 24 could be movable bodily, with the cross-suspension element 12, to effect the required adjustment.

Landscapes

  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Impression-Transfer Materials And Handling Thereof (AREA)
  • Glass Compositions (AREA)
  • Surgical Instruments (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Dry Shavers And Clippers (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
  • Measurement Of Radiation (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)
  • Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)

Abstract

A ribbon transducer has its ribbon (10) which is held at each end made capable of lateral movement for adjustment purposes by providing a plurality of traverse cross-suspension elements (12) to which the ribbon is secured, with each of these cross-suspension elements being capable of transverse displacement, for example by rotation of mounting pillars (14a, 14b).

Description

    RIBBON TRANSDUCERS
  • This invention relates to ribbon transducers and is particularly concerned with the mounting of the ribbon itself, particularly in transducers for use in loudspeakers and microphones.
  • In order to achieve satisfactory operation of a ribbon transducer it is necessary that the ribbon itself should be centered so that its longitudinal axis lies correctly in relation to the other components. Various methods have been proposed heretofore for centering a ribbon. One method involves the use of shaped magnets for this purpose. In another alternative arrangement the ribbon is attached to stretcher elements at its sides and is held in tension by a spring mechanism. Such arrangements are complicated and not capable of easy adjustment.
  • In US-A-4317966 there is described a vibrating ribbon speaker where a ribbon extends between respective end suspension fixtures and a plurality of cross-suspension elements are arranged transversely of the longitudinal axis of the ribbon and to which the ribbon is secured.
  • It is an object of the present invention to provide a means for centering a ribbon of a ribbon transducer in a manner which is simple and capable of easy adjustment.
  • In accordance with the present invention this is achieved by providing a plurality of cross-suspension elements arranged transversely to the longitudinal axis of the ribbon and to which the ribbon is secured, characterised in that each of these cross-suspension elements is capable of displacement in the direction at right-angles to the longitudinal axis of the ribbon to produce consequential lateral movement of the ribbon.
  • Preferably, the cross-suspension elements comprise strips or bands of material affixed by adhesive for example to one face of the ribbon and secured at each end to support means. The support means can be adjusted to effect movement of the cross-suspension elements at right-angles to the longitudinal axis of the ribbon.
  • In order that the invention may be more fully understood, preferred embodiments of cross-suspension mounting for a ribbon of a ribbon transducer will now be described by way of example and with reference to the accompanying drawings, in which:
    • Fig. 1 is an isometric view of a first embodiment of mounting arrangement; and
    • Fig. 2 is a schematic diagram of a second mounting arrangement.
  • Referring to the drawings, there is shown in Fig. 1 a ribbon foil 10 which constitutes part of a ribbon transducer, for example for a loudspeaker. Beneath the underside of the ribbon foil 10 lies a cross-suspension element 12. This is in the form of a band or strip which is affixed, for example by adhesive, to the underside of the ribbon foil. The ends of the cross-suspension element 12 are secured in suspension pillars 14a and 14b positioned one on each side of the ribbon foil so that the element 12 lies at right-angles to the longitudinal axis of the foil. Each of the suspension pillars 14a, 14b is provided with a slot in the end thereof, so that the pillars can be rotated, for example with a screwdriver. The suspension pillars 14a, 14b are mounted on rear and front extrusion plates 16a and 16b respectively so that they can be rotated relative to the support plates and will hold their adjusted positions. The front and rear extrusion plates 16a, 16b also serve as support plates for magnets 18 which are held in place by backing plates 20.
  • In use, in order to centre the ribbon foil 10, it is simply necessary to displace the cross-suspension element 12 by rotation of the suspension pillars until the ribbon foil is accurately centered. A maximum displacement of plus or minus 1 millimetre is generally sufficient.
  • It will be appreciated that the ribbon foil 10 is provided with a plurality of cross-suspension elements 12 at intervals along its length so that the foil can be accurately centered throughout its length.
  • Alternative methods of mounting the cross-suspension elements 12 may be devised within the scope of the present invention. For example, as shown in Fig. 2, instead of providing a suspension pillar on each side of the ribbon foil, the cross-suspension element 12 could be mounted between the two limbs 22, 23 of a generally U-shaped support member 24, for example a plastics moulding. Adjustment means would then be provided for moving the cross-suspension element 12 relative to the U-shaped support 24. Alternatively, the U-shaped support 24 could be movable bodily, with the cross-suspension element 12, to effect the required adjustment. Various other alternative methods of mounting and support will be apparent to those skilled in the art.

Claims (6)

  1. A ribbon transducer comprising a ribbon (10) extending between respective end suspension means, and a plurality of cross-suspension elements (12) arranged transversely of the longitudinal axis of the ribbon and to which the ribbon is secured, characterised in that each of the cross-suspension elements (12) is capable of displacement in the direction at right-angles to the longitudinal axis of the ribbon (10) to produce consequential lateral movement of the ribbon.
  2. A ribbon transducer according to claim 1, characterised in that the cross-suspension elements (12) comprise strips or bands of material which traverse the ribbon and are fixed to the ribbon and are secured at each end to support means (14a, 14b; 22, 23).
  3. A ribbon transducer according to claim 2, characterised in that the strips or bands are fixed to the ribbon by adhesive.
  4. A ribbon transducer according to claim 2 or 3, characterised in that said support means (14a, 14b; 22, 23) can be adjusted to effect movement of the cross-suspension elements at right-angles to the longitudinal axis of the ribbon.
  5. A ribbon transducer according to claim 2, 3 or 4, characterised in that the support means comprises adjustably rotatable posts (14a, 14b) positioned on each side of the ribbon.
  6. A ribbon transducer according to claim 1, characterised in that each cross-suspension element is carried by a U-shaped support member (24) which bridges the ribbon.
EP90306630A 1989-06-21 1990-06-18 Ribbon transducers Expired - Lifetime EP0404488B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8914241 1989-06-21
GB898914241A GB8914241D0 (en) 1989-06-21 1989-06-21 Ribbon transducers

Publications (3)

Publication Number Publication Date
EP0404488A2 EP0404488A2 (en) 1990-12-27
EP0404488A3 EP0404488A3 (en) 1992-04-15
EP0404488B1 true EP0404488B1 (en) 1994-08-24

Family

ID=10658810

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90306630A Expired - Lifetime EP0404488B1 (en) 1989-06-21 1990-06-18 Ribbon transducers

Country Status (8)

Country Link
EP (1) EP0404488B1 (en)
JP (1) JP2523949B2 (en)
AT (1) ATE110514T1 (en)
CA (1) CA2019540C (en)
DE (1) DE69011763T2 (en)
DK (1) DK0404488T3 (en)
ES (1) ES2062370T3 (en)
GB (1) GB8914241D0 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB793261A (en) * 1955-06-13 1958-04-16 Reslosound Ltd Improvements in and relating to electromechanical transducers
US4317966A (en) * 1980-02-19 1982-03-02 Lister Clive R B Vibratory ribbon speaker
US4580014A (en) * 1983-06-21 1986-04-01 Hobrough Theodore B Means for controlling ribbon edge clearance in a ribbon loudspeaker

Also Published As

Publication number Publication date
EP0404488A2 (en) 1990-12-27
CA2019540C (en) 1995-07-18
DE69011763T2 (en) 1995-03-16
JPH03129999A (en) 1991-06-03
DK0404488T3 (en) 1995-01-16
ATE110514T1 (en) 1994-09-15
ES2062370T3 (en) 1994-12-16
EP0404488A3 (en) 1992-04-15
CA2019540A1 (en) 1990-12-21
JP2523949B2 (en) 1996-08-14
DE69011763D1 (en) 1994-09-29
GB8914241D0 (en) 1989-08-09

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