Claims
- 1. A method of manufacturing a speaker diaphragm from a multi-layer block constructed of a plurality of rectangular thin layers to be developed into a diaphragm core having a honeycomb construction, said multi-layer block having left and right sides respectively corresponding to the outer surface of a first layer and the outer surface of the last layer of said plurality of layers, top and bottom sides respectively corresponding to the opposite edges of said plurality of rectangular thin layers, and front and rear ends respectively corresponding to the remaining edges of said rectangular thin layers, each of said rectangular thin being connected to an adjacent layer at a plurality of places by means of adhesive, said adhesive being arranged in the form of parallel strips, and these adhesive strips being substantially parallel to said front and rear ends of said multi-layer block, said method comprising the steps of:
- (a) developing said multi-layer block into a cylindrical block in such a manner that the bottom side of said multi-layer block corresponds to the center of said cylindrical block, walls forming each cell of the honeycomb of the cylinder extending radially of the cylinder;
- (b) connecting said left and right sides of each other by means of an adhesive which is painted on one of said left and right sides at spaced-apart intervals so as to form adhesive strips with a predetermined pitch;
- (c) expanding said front end which corresponds to the bottom of said cylindrical block radially for obtaining said diaphragm core, said expanding step having the steps of
- (a) inserting an apex of a cone-shaped tool into the center of said bottom of said cylindrical block for making the shape of said cylindrical block to be a truncated cone;
- (b) drawing out said cone-shaped tool from the truncated cone;
- (c) further developing said truncated cone into a flat disk, in which said walls forming each of said cells of the honeycomb extend axially of said flat disk, by the steps of
- (i) placing said truncated cone on a flat plate; and
- (ii) applying a force at the top of said truncated cone in a direction perpendicular to said flat plate for making the shape of said truncated cone to be a flat disk; and
- (d) attaching a thin layer to each of the top and bottom of said diaphragm core.
Parent Case Info
This is a continuation-in-part of patent application Ser. No. 149,368, filed May 13, 1980, now abandoned.
US Referenced Citations (7)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
149368 |
May 1980 |
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