GB2228391A - Metal mold for loudspeaker diaphragm - Google Patents

Metal mold for loudspeaker diaphragm Download PDF

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Publication number
GB2228391A
GB2228391A GB8917197A GB8917197A GB2228391A GB 2228391 A GB2228391 A GB 2228391A GB 8917197 A GB8917197 A GB 8917197A GB 8917197 A GB8917197 A GB 8917197A GB 2228391 A GB2228391 A GB 2228391A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
stationary
piece
movable
edge
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Withdrawn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
GB8917197A
Other versions
GB8917197D0 (en
Inventor
Katsumi Kinoshita
Kenzo Okada
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.)
Pioneer Corp
Original Assignee
Pioneer Electronic Corp
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 Pioneer Electronic Corp filed Critical Pioneer Electronic Corp
Publication of GB8917197D0 publication Critical patent/GB8917197D0/en
Publication of GB2228391A publication Critical patent/GB2228391A/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1635—Making multilayered or multicoloured articles using displaceable mould parts, e.g. retractable partition between adjacent mould cavities
    • 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
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
    • B29L2031/3418—Loud speakers

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

Abstract

A molding apparatus for molding a diaphragm member of a speaker unit, which diaphragm member includes a diaphragm piece 12 and an edge piece 13 integral with an outer peripheral end of the diaphragm piece. The molding apparatus including a stationary metal mold 11, a movable metal mold 21 and a center core 22 disposed movably in a space defined between the stationary and movable molds. An edge cavity E is provided at a portion of parting faces between two molds, and a diaphragm cavity is temporarily defined upon movement of the center core. When the center core is moved in one direction, the diaphragm cavity disappears and the edge cavity is closed by center core. When the center core is moved in opposite direction, the diaphragm cavity 12 is provided and it is communicated with the edge cavity. <IMAGE>

Description

METAL MOLD APPARATUS FOR MOLDING DIAPHRAGM OF SPEAKER UNIT The present invention relates to a metal mold apparatus for molding a diaphragm of a speaker unit, and more particularly, to a metal mold apparatus capable of integrally providing a diaphragm piece and an edge piece.
As shown in Fig. 1, a diaphragm member of a speaker unit includes a diaphragm portion 1 and an edge piece 2 provided integral with an outer peripheral edge portion of the diaphragm portion 1. An outer peripheral end portion of the edge piece 2 is attached to a speaker frame 4 through a gasket 3. In a conventional method for producing a diaphragm member, the edge piece 2 is manufactured in a process different from the manufacturing process of the diaphragm piece 1, and the edge piece is integrated with the diaphragm piece 1 at a final step.
One conventional method for producing the diaphragm member will be described with reference to Figs. 2(a) thru 2(f). A crashed pulp 1' is applied onto a paper making or molding device 1A as shown in Fig. 2(a), and the thus prepared paper is thermally dried with a hot air H as shown in Fig. 2(b). The dried paper is separated from the device so as to produce a diaphragm piece 1 as shown in Fig. 2(c).
In order to independently prepare the edge piece, a woven fabric 2A shown in Fig. 2(d) is subjected to resin coating 2B as shown in Fig. 2(e), and then is thermally molded as shown in Fig. 2(f). This molded product is punched for making an edge piece 2, and the edge piece is sticked to the diaphragm piece to thereby provide the diaphgram member.
In the above described production method, a process for making the diaphragm piece is carried out independent of a process for making the edge piece, and further, integration process is required for providing an integral structure between the diaphragm piece and the edge piece. Accordingly complex production steps are required.
To avoid this, if the diaphragm piece and the edge piece can be integrally molded with a resin, entire production steps can be simplified. However, a desirable diaphragm member is not obtainble in an aspect of acoustics, since requisite function of the diaphragm piece is different from that of the edge piece.
Recently, insertion molding is adopted for integrally providing the diaphragm piece with the edge piece. However, this insertion molding is similar to the conventional method in that the edge piece must be provisionally molded, and further, a metal mold must have an intricate structure.
Therefore, it is an object of the present invention to overcome the above-described drawbacks and to provide an improved metal mold apparatus for molding a diaphragm member for a speaker unit.
Another object of the invention is to provide such metal mold apparatus capable of efficiently producing, within this single metal mold apparatus, a diaphragm and edge pieces which are made of materials different from each other.
According to the invention, a metal mold apparatus, for molding a diaphragm member of a speaker unit, the diaphragm member having a diaphragm piece and an edge piece integral therewith, comprises a stationary mold; a movable mold positioned in confronting relation with the stationary mold; a centre core movable in the stationary and movable molds; an edge piece cavity defined at a portion of parting faces between the stationary and movable molds for molding the edge piece; and a diaphragm cavity defined at a portion of parting faces of the centre core and of the stationary or movable mold for molding the diaphragm piece; the diaphragm cavity being contiguous with the edge cavity at a communicating portion, the centre core providing a first position for opening the communicating portion and a second position for closing the communicating portion, and a moving stroke of the centre core corresponding to a thickness of the diaphragm piece.
During injection for the edge piece, the movable centre core is displaced toward the mold face of the stationary or movable mold, so that the communicating portion between the diaphragm cavity and the edge cavity is closed, and the diaphragm cavity disappears. Upon completion of the injection molding for molding the edge piece, the center core is moved to its original position so as to provide the diaphragm cavity, and then resin for making the diaphragm piece is injected thereinto. In this instance, the diaphragm cavity becomes contiguous with the edge piece molded in the edge cavity. Accordingly, the diaphragm piece can be integral with the edge piece.
In the drawings:, Fig. 1 is a schematic view showing a conventional diaphragm member attached to a speaker frame; Figs. 2(a) thru 2(f) show schematic views for description of a conventional method for molding the diaphragm member; Fig. 3 is a cross-sectional view showing a metal mold apparatus for molding a diaphragm member of a speaker unit according to the present invention; Fig. 4 is a partial enlarged view of Fig. 3; and Fig. 5(a) and 5(b) are cross-sectional views showing molding steps in the present invention.
One embodiment according to this invention will be described with reference to Figs. 3 thru 5(b).
As shown in Fig. 3, a stationary metal mold 11 and a confronting movable metal mold 21 are provided. The stationary metal mold 11 has a gate 11A for injecting a resin such as polypropylene therethrough for molding the diaphragm piece. Between the stationary and movable molds 11 and 21, an internal chamber C having generally a frustoconical shape is provided in which a center core 22 is movably provided. Further, at a partial parting faces between the stationary and movable moldes, an edge cavity 13 is provided. The edge cavity 13 is communicated with a gate 13A for injecting a resin such as an elastomer resin therethrough for molding the edge piece.
The center core 22 is movable in an axial direction thereof within the chamber C. An outer conical profile of the center core 22 is identical with an inner conical profile of the stationary mold 11. Further, an outer cylindrical portion 22A of the center core 22 is disposed slidable on an inner peripheral surface 21A of the movable core 21. The stationary mold 11 has an inner conical profile portion 11B, and the movable mold 21 has an inner cylindrical profile portion 21A, The center core 22 is provided with a conical surface portion 22B and the cylindrical portion 22A. The conical surface portion 22B has an outer profile identical with the inner conical profile portion 11B of the stationary mold 11, and the cylindrical portion 22A has a diameter equal to an inner diameter of the inner cylindrical profile 21A of the movable mold 21.A communicating portion 12A is provided at a boundary defined between the inner profile portion 21A of the movable mold 21 and an end line of the conical profile portion liB of the stationary mold 11.
More specifically, the center core 22 has a first moving position in close contact with a molding face of the stationary mold 11 and has a second position spaced away therefrom by a distance S. Therefore, when the center core is moved to the second position, a diaphragm cavity 12 is provided between the stationary mold 11 and the center core 22. In this case, the diaphragm cavity 12 is communicated with the edge cavity 13 at the communicating portion 12A.
On the other hand, when the center core 22 is moved to the first position, the communicating portion 12A is closed by the outer peripheral portion 22A of the center core 22.
In other words, the edge cavity 13 is provided by a parting line defined between the movable and stationary molds, and the parting line therebetween includes the diaphragm cavity 12. The center core 22 is linearly movable by the stroke S corresponding to a depth of the diaphragm cavity 12. The outer peripheral surface of the center core 22 can close the communicating portion 12A between the edge cavity 13 and the diaphragm cavity 12 in response to the movement of the center core 22.
Next, described will be the production method in using the metal mold apparatus for molding the diaphragm of the speaker unit according to the present invention.
First, the movable mold 21 is adjusted with respect to the stationary mold 11, and the diaphragm cavity 12 is closed by the center core 22 as shown in Fig. 5(a). With this state, a resin is injected through the gate 13A to form the edge piece E within the edge cavity 13. In this case, since the communicating portion 12A between the edge cavity 13 and the diaphragm cavity 12 is closed by the outer peripheral surface 22A of the center core 22, the edge piece E is not entered into the diaphragm cavity 12.
Upon completion of injection of the edge piece E, the center core 22 is moved to its second position by the predetermined stroke S so that the diaphragm cavity 12 is provided. Then the diaphragm material B is injected through the gate 11A while opened is the communicating portion 12A between the diaphragm cavity 12 and the edge cavity 13 in which the edge material E has already been injected. The diaphragm material B thus injected is becoming integral with an inner peripheral edge portion of the edge member E.
In view of the foregoing, in the metal mold apparatus for molding the diaphragm of the speaker unit according to this invention, since the center core which defines the diaphragm cavity is movably provided so as to open and close the communicating portion between the diaphragm cavity and the edge cavity, the diaphragm provided with the edge piece can be simply obtained by the injection molding in using the single metal mold apparatus, and the diaphragm can be produced at low cost.

Claims (3)

1. A metal mold apparatus for molding a diaphragm member of a speaker unit, the diaphragm member having a diagragm piece and an edge piece integral therewith, the apparatus comprising a stationary mold; a movable mold positioned in confronting relation with the stationary mold; a centre core movable in the stationary and movable molds; an edge piece cavity defined at a portion of parting faces between the stationary and movable molds for molding the edge piece; and a diaphragm cavity defined at a portion of parting faces of the centre core and of the stationary or movable mold for molding the diaphragm piece; the diaphragm cavity being contiguous with the edge cavity at a communicating portion, the centre core providing a first position for opening the communicating portion and a second position for closing the communicating portion, and a moving stroke of the centre core corresponding to a thickness of the diaphragm piece.
2. An apparatus as claimed in claim 1, wherein a space is provided between the stationary and movable molds, and the centre core is axially movable in the space, and wherein the stationary mold has an inner conical profile portion, and the movable mold has an inner cylindrical profile portion, the centre core being provided with a conical surface portion and a cylindrical portion, the conical surface portion having an outer profile identical with the inner conical profile portion of the stationary mold, and the cylindrical portion having a diameter equal to an inner diameter of the inner cylindrical profile of the movable mold, the communicating portion being provided at a boundary defined between the inner profile portion of the movable mold and an edge line of the conical profile portion of the stationary mold.
3. A metal mold apparatus, substantially as described with reference to Figures 3 to 5 of the accompanying drawings.
GB8917197A 1989-02-10 1989-07-27 Metal mold for loudspeaker diaphragm Withdrawn GB2228391A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3162989A JPH02209215A (en) 1989-02-10 1989-02-10 Die device of diaphragm for speaker

Publications (2)

Publication Number Publication Date
GB8917197D0 GB8917197D0 (en) 1989-09-13
GB2228391A true GB2228391A (en) 1990-08-22

Family

ID=12336503

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8917197A Withdrawn GB2228391A (en) 1989-02-10 1989-07-27 Metal mold for loudspeaker diaphragm

Country Status (2)

Country Link
JP (1) JPH02209215A (en)
GB (1) GB2228391A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0492914A2 (en) * 1990-12-20 1992-07-01 Leach, Patrick Arthur Loudspeaker cone and surround assembly
EP0552040A1 (en) * 1992-01-15 1993-07-21 Patrick Arthur Leach Method and apparatus for making a loudspeaker cone and surround assembly
EP0632674A1 (en) * 1993-06-28 1995-01-04 Sony Corporation Diaphragm for use with an electro-acoustic transducer and method of producing the same
GB2326373A (en) * 1998-08-20 1998-12-23 Kurt Mueller Uk Limited Method and mould for moulding a speaker cone
GB2327902A (en) * 1997-10-14 1999-02-10 Kurt Mueller A speaker cone and method of manufacture thereof

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0082757A1 (en) * 1981-12-23 1983-06-29 Allibert Sa. Method of making a lid of a recipient provided with a retractable pouring spout, and mould for carrying out this method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0082757A1 (en) * 1981-12-23 1983-06-29 Allibert Sa. Method of making a lid of a recipient provided with a retractable pouring spout, and mould for carrying out this method

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0492914A2 (en) * 1990-12-20 1992-07-01 Leach, Patrick Arthur Loudspeaker cone and surround assembly
EP0492914A3 (en) * 1990-12-20 1992-10-21 Leach, Patrick Arthur Loudspeaker cone and surround assembly
EP0552040A1 (en) * 1992-01-15 1993-07-21 Patrick Arthur Leach Method and apparatus for making a loudspeaker cone and surround assembly
WO1993014608A1 (en) * 1992-01-15 1993-07-22 Patrick Arthur Leach Method and apparatus for making a loudspeaker cone and surround assembly
GB2273678A (en) * 1992-01-15 1994-06-29 Patrick Arthur Leach Method and apparatus for making a loudspeaker cone and surround assembly
GB2273678B (en) * 1992-01-15 1995-05-03 Patrick Arthur Leach Method and apparatus for making a loudspeaker cone and surround assembly
US6171534B1 (en) 1992-01-15 2001-01-09 Patrick Arthur Leach Method of making a speaker cone and surround assembly
EP0632674A1 (en) * 1993-06-28 1995-01-04 Sony Corporation Diaphragm for use with an electro-acoustic transducer and method of producing the same
US5521886A (en) * 1993-06-28 1996-05-28 Sony Corporation Diaphragm for use with an electro-acoustic transducer and method of producing the same
CN1071986C (en) * 1993-06-28 2001-09-26 索尼公司 Diaphragm for use with an electro-acoustic transducer and method of producing the same
GB2327902B (en) * 1997-10-14 2000-01-12 Kurt Mueller Speaker cone
GB2328177A (en) * 1997-10-14 1999-02-17 Kurt Mueller Injection moulding an elastomeric surround to a speaker cone
GB2327903A (en) * 1997-10-14 1999-02-10 Kurt Mueller A speaker cone and a method of manufacture thereof
GB2327903B (en) * 1997-10-14 2000-01-12 Kurt Mueller Speaker cone
GB2328177B (en) * 1997-10-14 2000-01-12 Kurt Mueller Speaker cone
GB2327902A (en) * 1997-10-14 1999-02-10 Kurt Mueller A speaker cone and method of manufacture thereof
GB2326373B (en) * 1998-08-20 2000-01-19 Kurt Mueller Speaker cone
GB2326373A (en) * 1998-08-20 1998-12-23 Kurt Mueller Uk Limited Method and mould for moulding a speaker cone

Also Published As

Publication number Publication date
JPH02209215A (en) 1990-08-20
GB8917197D0 (en) 1989-09-13

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)