Title:
METHOD FOR MANUFACTURING DIAPHRAGM EDGE
Document Type and Number:
Japanese Patent JP2012169887
Kind Code:
A
Abstract:
To provide a method for manufacturing a diaphragm edge, which prevents the diaphragm edge from being broken due to its thinness and greatly improves acoustic properties, when the thin-walled diaphragm edge is manufactured.
Injection gates 6 are disposed in depth-increased areas 7 that are formed in a plurality of locations in a circumferential direction of a molding cavity 4. A diaphragm edge 10 is manufactured by injecting an edge material from the injection gate 6 and making the edge material flow in the circumferential direction in the molding cavity 4. An orientation direction of the diaphragm edge 10 is set as the circumferential direction.
Inventors:
TAKAHASHI RYOICHI
Application Number:
JP2011029439A
Publication Date:
September 06, 2012
Filing Date:
February 15, 2011
Export Citation:
Assignee:
BRIDGESTONE CORP
International Classes:
H04R31/00; B29C45/27; H04R7/20
Attorney, Agent or Firm:
Kenji Sugimura
Kazuyuki Tomita
Ken Ogushi
Kazuyuki Tomita
Ken Ogushi