EP1084022A1 - Procede et agencement permettant de fabriquer un diaphragme en plastique destine a un transducteur electroacoustique - Google Patents

Procede et agencement permettant de fabriquer un diaphragme en plastique destine a un transducteur electroacoustique

Info

Publication number
EP1084022A1
EP1084022A1 EP00920472A EP00920472A EP1084022A1 EP 1084022 A1 EP1084022 A1 EP 1084022A1 EP 00920472 A EP00920472 A EP 00920472A EP 00920472 A EP00920472 A EP 00920472A EP 1084022 A1 EP1084022 A1 EP 1084022A1
Authority
EP
European Patent Office
Prior art keywords
deep
foil
length
drawing die
front surface
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Withdrawn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
EP00920472A
Other languages
German (de)
English (en)
Inventor
Ewald Frasl
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.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
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 Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Priority to EP00920472A priority Critical patent/EP1084022A1/fr
Publication of EP1084022A1 publication Critical patent/EP1084022A1/fr
Withdrawn legal-status Critical Current

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
    • H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
    • H04R31/003—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor for diaphragms or their outer suspension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/26—Component parts, details or accessories; Auxiliary operations
    • B29C51/30—Moulds
    • B29C51/36—Moulds specially adapted for vacuum forming, Manufacture thereof
    • B29C51/365—Porous moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0822—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using IR radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/001—Shaping in several steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/004—Shaping under special conditions
    • B29C2791/006—Using vacuum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/004—Shaping under special conditions
    • B29C2791/007—Using fluid under pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/008—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor without using a mould, e.g. ballooning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/10—Forming by pressure difference, e.g. vacuum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/755—Membranes, diaphragms

Definitions

  • the invention relates to a method of manufacturing a diaphragm as defined in the opening part of Claim 1.
  • the invention further relates to an arrangement as defined in the opening part of Claim 5.
  • the invention further relates to a diaphragm as defined in the opening part of
  • the known method and the known arrangement use a deep-drawing die which consists of brass and which has air ducts between the front of the deep-drawing die and the rear of the deep- drawing die, which ducts extend substantially in the deep-drawing direction and are formed by holes having a diameter of, for example, approximately 0J 5 mm.
  • the air ducts have been provided to allow the air present between the length of foil and the front of the deep-drawing die during a deep-drawing process to escape as rapidly as possible from this area, namely through the deep-drawing die via the air ducts.
  • the air is discharged in a point by point fashion because the air can escape only through the air ducts in a point by point fashion, which leads to a comparatively inhomogeneous contact of the length of foil on the deep-drawing die at the location of the front of this die.
  • Another problem is that during a deep- drawing process the thin air ducts may already be covered by the length of foil in an early stage, after which the residual air can no longer escape unimpededly.
  • the known construction further requires a comparatively high pressure in order to press the foil onto the front of the deep-drawing die in a reliable manner. Moreover, comparatively long cycle times are needed.
  • a deep-drawing die of a sintered material it is achieved that no convex irregularities are formed on any of the diaphragm surfaces of a manufactured diaphragm because such a deep-drawing die of a sintered material has a perfectly uniform cross-sectional shape without any entrances to air ducts.
  • a further advantage of such a deep-drawing die of a sintered material is that the manufacturing costs for the manufacture of such a deep-drawing die are substantially lower than for the manufacture of a known brass deep-drawing die provided with thin air ducts.
  • a diaphragm in accordance with the invention does not exhibit any irregularities, such as convex protrusions, on its diaphragm surfaces, as a result of which it has a particularly uniform shape in the direction of its thickness, which is particularly favorable for a high acoustic performance.
  • Figure 1 shows an arrangement embodying the invention in a highly diagrammatic manner, which arrangement is adapted to manufacture a plastic diaphragm for an electroacoustic transducer by means of a method in accordance with the invention and includes a deep-drawing station.
  • Figure 2 shows a part of the deep-drawing station of the arrangement shown in
  • Figure 1 to an enlarged scale in comparison with Figure 1 , the part shown including a deep- drawing die of the deep-drawing station.
  • Figure 3 shows a diaphragm manufactured by means of the arrangement shown in Figure 1.
  • FIG 1 diagrammatically shows an arrangement 1 for manufacturing a plastic diaphragm 2 having a given cross-sectional shape for an electroacoustic transducer, not shown.
  • a diaphragm 2 is shown in Figure 3.
  • the diaphragm 2 has a curved central portion 4, which is rotationally symmetrical with respect to a diaphragm axis 3, a substantially flat annular intermediate portion 5, a curved peripheral portion 6, a hollow cylindrical spacer portion 7, which extends parallel to the diaphragm axis 3, and a mounting portion 8, which extends perpendicularly to the diaphragm axis 3.
  • the intermediate portion 5 serves for connection to a moving coil, not shown.
  • the mounting portion 8 serves for mounting the diaphragm 2 in an electroacoustic transducer.
  • the device 1 comprises a multitude of parts, of which parts the means mentioned and described hereinafter are shown in Figure 1.
  • the arrangement 1 has positioning means 9 which serve for positioning a length of foil 10, which consists of a plastic and is essentially flat.
  • the positioning means 9 include a first positioning ring 1 1 and a second positioning ring 12.
  • the two positioning rings 1 1 and 12 are held together to be coaxial with the diaphragm axis 3 in a manner not shown, the length of flat foil 10 being held between them, as is illustrated for the position of the positioning means 9 indicated by the reference symbol PI in Figure 1.
  • the positioning means 9 are movable into the position bearing the reference symbol PI in a direction indicated by an arrow 13.
  • the positioning means 9 form feed-in means which are movable to a deep-drawing station of the arrangement 1 in order to feed in the length of substantially flat plastic foil 10, as will be described in greater detail hereinafter.
  • the arrangement 1 further includes a heating station 14.
  • the length of substantially flat foil 10 can be fed to the heating station 14 with the aid of the positioning means 9 in a direction indicated by an arrow 15.
  • the heating station 9 has infrared radiators 16 which are carried by a fixture 17 for the infrared radiators 16.
  • the heating station 14 further has a power supply source 18 for the infrared radiators 16, which power supply source is connected to the infrared radiators 16 via an electrically conductive connection 19.
  • the flat foil section 10 can be heated to a temperature in a given temperature range. This heating of the foil section 10 results in a slight plastic deformation of the length of foil 10, thereby causing the length of foil 10 to sag, as is shown at the position bearing the reference symbol P2 in Figure 1.
  • the arrangement 1 further includes a deep-drawing station 20 in which deep- drawing in a given deep-drawing direction 21 can be effected.
  • the deep-drawing station 20 has a die box 22 comprising a lower section 23 and an upper section 24.
  • the lower section 23 In the end surface 26 of the lower section 23, which faces the end surface 25 of the upper section 24, the lower section has been provided with a seal 27 in the form of a so-called O-ring.
  • the lower section 23 has a low-pressure chamber 28.
  • the upper section 24 has a high-pressure chamber 29.
  • the lower section 23 can be moved in the direction indicated by an arrow 30 into the operating position shown in Figure 1.
  • the upper section 24 can be moved in the direction indicated by an arrow 31 into the operating position shown in Figure 1.
  • the intermediate area between the two end surfaces 25 and 26 is sealed by means of the seal 27.
  • the length of foil 10 can be brought to the deep-drawing station 20 in the direction indicated by an arrow 32 with the aid of the feed-in means formed by the positioning means 9, the positioning means 9 together with the length of foil 10 then assuming the position bearing the reference symbol P3 in Figure 1.
  • the deep-drawing station 20 has a deep-drawing die 33 mounted in the lower section 23.
  • the deep-drawing die 33 has a front surface 34 with a cross-sectional shape corresponding to the cross-sectional shape of the diaphragm 2 and a rear surface 35 spaced from the deep-drawing direction 21.
  • the aid of retaining means which in the present case are formed by means the lower section 23, the seal 27 provided in the lower section and the upper section 24, the length of foil 10, which has been fed to the deep-drawing station 20 with the aid of the positioning means 9, can be held in a position opposite to the front surface 34 of the deep-drawing die 33.
  • the arrangement 1 i.e. its deep-drawing station 20, includes a vacuum generating device 36 by means of a which a partial vacuum can be generated.
  • the vacuum generating device 36 is connected to a coupling portion 38 of the lower section 23 via a flexible tube 37, the vacuum generating device 36 thus being connected to the low-pressure chamber 28.
  • the vacuum generating device 36 it is possible to subject the deep- drawing die 33 to suction in the area of the rear surface 35 of the deep-drawing die 33 and to extract the air present between the front surface 34 of the deep-drawing die 3 and the length of foil 10 facing the front surface 34 from the front surface 34 of the deep-drawing die 33, through the deep-drawing die 33, to the rear surface 35 of the deep-drawing die 33.
  • the arrangement 1, i.e. its deep-drawing station 20, further includes a pressurizing device 39.
  • a pressurizing device 39 By means of the pressurizing device 39 a higher pressure can be produced.
  • the pressurizing device 39 is connected to a coupling portion 41 of the upper section 24 via a flexible tube 40, the pressurizing device 39 thus being connected to the high- pressure chamber 29.
  • the pressurizing device 39 it is possible to exert pressure on the length of foil 10 which faces the front surface 34 of the deep-drawing die 33 and to press the length of foil 10 which faces the front surface 34 onto the front surface 34 of the deep- drawing die 33.
  • this length of foil 10 can be given a cross-sectional shape corresponding to that of the front surface 34 of the deep-drawing die 33.
  • a length of foil 42 is shown which has already been given the cross-sectional shape corresponding to that of the front surface 34 of the deep-drawing die 33.
  • the arrangement 1 has feed-out means for feeding the length of foil 42 provided with the given cross-sectional shape away from the deep-drawing station 20 and to further means of the arrangement 1, said feed-out means enabling the length of foil 42 provided with the given cross-sectional shape away from the deep-drawing station 20.
  • the feed-out means just as the feed-in means, are formed by the positioning means 9. Feeding-out with the aid of the positioning means can be effected in the direction indicated by an arrow 43.
  • the arrangement 1 further includes joining means 44 adapted to receive a length of foil 42 provided with the given cross-sectional shape can be conveyed after it has been moved away from the deep-drawing station 20 in the direction indicated by the arrow 43 and, in addition, adapted to receive a metal ring 45, which joining means enable the useful portion 46 of the length of foil 42, which portion has the given cross-sectional shape and subsequently forms the diaphragm 2, to be joined to the metal ring 45 in such a manner that the metal ring 45 surrounds the useful portion 46 of the length of foil 42.
  • the joining means 44 include supporting means 47, which are movable in the direction indicated by an arrow 48 from a rest position into an operating position shown in Figure 1 , in which operating position a length of foil 42 which is in the position referenced P4 can be supported by the supporting means 47.
  • the joining means 44 further include substantially pot-shaped holding means 49 which are annular in their area 50 which faces the supporting means 47 and which are movable in the direction indicated by an arrow 51 from a rest position into the operating position shown in Figure 1.
  • the holding means 49 can hold the metal ring 45 in such a manner that upon a movement of the holding means 49 in the direction indicated by the arrow 51 the metal ring 45 can be brought into contact with the length of foil 42.
  • the arrangement 1 includes separating means 53 at a location corresponding to the position P5.
  • the separating means 53 serve for separating the residual portion 54 of the length of foil 42 from the useful portion 46 of the length of foil 42 along a circular separating zone which extends in radial directions outside the metal ring.
  • the separating means are arranged and constructed accordingly.
  • the separating means 53 include a laser beam source 55 which is arranged on a rotationally drivable support 55H for the laser beam source 55 and which is capable of generating a laser beam 56 represented diagrammatically in Figure 1.
  • the laser beam 56 is aimed at the length of foil 42 and enables the residual portion 54 of the length of foil 42 and the useful portion 46 of the length of foil 42 to be separated in a simple and exact manner.
  • the metal ring 45 together with the length of foil 42 attached to it can be held by further pot-shaped holding means 57, as is illustrated in Figure 1.
  • the further holding means 57 are movable in a direction indicated by an arrow 58 from a rest position not shown into the operating position shown in Figure 1.
  • the further holding means 57 are movable in a direction indicated by an arrow 59, namely into a position indicated by the reference symbol P6 in Figure 1.
  • the metal ring 45 together with the diaphragm 2 attached to it by an adhesive joint and formed by the useful portion 46 of the length of foil 42 is held in this position P6.
  • the finished diaphragm 2, together with the metal ring 45 joined to it for the purpose of holding and handling the diaphragm 2 can be moved in a direction indicated by an arrow 62 into a further position, not shown, for example in order to be packaged with the aid of a packaging device.
  • the deep-drawing station 20 advantageously has a deep-drawing die 33 of a sintered material.
  • the deep-drawing die 33 of a sintered material reference is made to Figure 2 which shows the deep-drawing die 33 of a sintered material by way of illustration.
  • the deep-drawing die 33 has particle-free interstices between the particles 60 coalesced by sintering, as is known per se of a sintered material.
  • the deep-drawing die of a sintered material consists of non-corrodible steel particles and is produced by sintering of a steel granulate.
  • the deep- drawing die may consist of other metal particles, for example brass particles, coalesced by sintering.
  • the arrangement 1 in accordance with the invention shown in Figure 1 is capable of carrying out a method in accordance with the invention of manufacturing a plastic diaphragm 2 having a given cross-sectional shape for an electroacoustic transducer. Such a method in accordance with the invention has the process steps described hereinafter.
  • a length of substantially flat plastic foil 10 is transferred to the heating station 14, where the length of foil 10 is heated to a temperature in a desired given temperature range so as to promote plastic deformation of the length of foil 10. Subsequently, the length of foil 10 is transferred to the deep-drawing station 20, in which deep-drawing of the length of foil 10 is effected so as to obtain a length of foil 42 having a given cross-sectional shape.
  • the vacuum generating device 36 is activated so as to extract the air present between the still virtually non- deformed length of foil 10 and the front surface 34 of the deep-drawing die 33 via the particle- free interstices formed in the sintered material between the particles 60 of the sintered material which have been coalesced by sintering.
  • the pressurizing device 39 is activated to generate a pressure in the high-pressure chamber 29 which is sufficiently high to press the length of foil 10 to be subjected to plastic deformation onto the front surface 34 of the deep- drawing die 33. It is to be noted that during such a deep-drawing process the deep-drawing die is heated to a given temperature by heating means not shown, namely to a temperature in a range between 1 10°C and 145°C. The pressure in the high-pressure chamber 29 is then in a range between 10 bar and 25 bar.
  • the length of foil 42 is transferred to the joining means 44 with the aid of the length of foil 42 is joined to the metal ring 45.
  • the assembly is transferred to the separating means 53, with the aid of which the residual portion 54 of the length of foil 42 is separated from the useful portion 46 of the length of foil 42, after which the useful portion 46 of the length of foil 42, i.e. the diaphragm 2, which is attached to the metal ring 45, is subjected to further operations or processes.
  • the arrangement 1 in accordance with the invention and the method in accordance with the invention guarantee that during the manufacture of a plastic diaphragm 2 the air present between a length of foil 10 and the front surface 34 of the deep-drawing die 33 is extracted comparatively rapidly and, above all, in a particularly steady manner through the deep-drawing die 33, as a result of which a length of foil 42 is always pressed very homogeneously onto the front surface 34 of the deep-drawing die 33. Moreover, this is achieved at a comparatively low pressure and with comparatively short cycle times, as a result of which a high output per unit of time is guaranteed.
  • a diaphragm in accordance with the invention as shown in Figure 3 has the particularly important advantage that no irregularities are produced on any diaphragm surface of the manufactured diaphragm 2 because this diaphragm 2 has been manufactured by means of a deep-drawing die 33 of the deep-drawing station 20 of the arrangement 1 in accordance with the invention, which deep-drawing die consists of a sintered material and does not have any ducts for extracting the air, as a result of which no irregularities caused by such ducts can be produced during the manufacture of the diaphragm 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

Agencement (1) et procédé permettant de fabriquer un diaphragme en plastique (2), qui font appel à un poste d'emboutissage profond (20) comportant un outil d'emboutissage profond (33) constitué d'un matériau fritté. L'air présent entre la surface frontale (34) dudit outil (33) et la feuille de base (10) tournée vers ladite surface frontale (34) est extrait à travers l'outil (33) via les interstices exempts de particules formés dans ledit matériau fritté, entre les particules (60) coalescées par le frittage.
EP00920472A 1999-03-25 2000-03-06 Procede et agencement permettant de fabriquer un diaphragme en plastique destine a un transducteur electroacoustique Withdrawn EP1084022A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP00920472A EP1084022A1 (fr) 1999-03-25 2000-03-06 Procede et agencement permettant de fabriquer un diaphragme en plastique destine a un transducteur electroacoustique

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP99890106 1999-03-25
EP99890106 1999-03-25
EP00920472A EP1084022A1 (fr) 1999-03-25 2000-03-06 Procede et agencement permettant de fabriquer un diaphragme en plastique destine a un transducteur electroacoustique
PCT/EP2000/001869 WO2000058073A1 (fr) 1999-03-25 2000-03-06 Procede et agencement permettant de fabriquer un diaphragme en plastique destine a un transducteur electroacoustique

Publications (1)

Publication Number Publication Date
EP1084022A1 true EP1084022A1 (fr) 2001-03-21

Family

ID=8243971

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00920472A Withdrawn EP1084022A1 (fr) 1999-03-25 2000-03-06 Procede et agencement permettant de fabriquer un diaphragme en plastique destine a un transducteur electroacoustique

Country Status (4)

Country Link
EP (1) EP1084022A1 (fr)
JP (1) JP2002539988A (fr)
CN (1) CN1310665A (fr)
WO (1) WO2000058073A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE450120T1 (de) * 2001-02-13 2009-12-15 Nxp Bv Verfahren zur herstellung eines elektroakustischen wandlers mit einer membrankonfiguration
KR100552336B1 (ko) * 2004-08-11 2006-03-21 주식회사 비에스이 피드백 방식의 박막 신장 시스템 및 박막 신장 방법
CN105848063B (zh) * 2015-01-13 2019-05-14 奥音科技（北京）有限公司 扬声器振膜组件、扬声器及制作扬声器振膜组件的方法
CN106239883A (zh) * 2016-09-07 2016-12-21 滁州市鑫鼎机械模具制造有限公司 一种改进的冰箱内胆真空成型模具

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Publication number Priority date Publication date Assignee Title
US3527854A (en) * 1968-06-04 1970-09-08 Gulf Oil Corp Method for the continuous production of open top containers
JPS57131198A (en) * 1981-02-05 1982-08-13 Matsushita Electric Ind Co Ltd Manufacture of diaphragm for loudspeaker
CH675096A5 (fr) * 1987-04-09 1990-08-31 Uniport Theodor Hirzel
DE3723021A1 (de) * 1987-07-11 1989-01-19 Alkor Gmbh Verfahren und vorrichtung zur herstellung von formteilen oder gegenstaenden
DE3834604C2 (de) * 1988-10-11 1997-02-27 Alkor Gmbh Verfahren und Vorrichtung zur Herstellung von Gegenständen aus Schaumstoff, die mit einer thermoverformbaren Kunststoffbahn beschichtet sind
DE19517458C1 (de) * 1995-05-12 1996-12-05 Sandler Helmut Helsa Werke Verfahren zu Herstellung einer vulkanisierten Elastomermembran

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0058073A1 *

Also Published As

Publication number Publication date
JP2002539988A (ja) 2002-11-26
CN1310665A (zh) 2001-08-29
WO2000058073A1 (fr) 2000-10-05

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