Method for manufacturing a paper diaphragm for a loud speaker
AssigneeSharp Kabushiki Kaisha
InventorYukimi Hiroshima
Life of this patent
Estimating the term…
Abstract
To manufacture a diaphragm of the present invention for use in a loud speaker, first a suspension is made by putting fibers consisting chiefly of polysaccharide constituting fibrous molecules into water. Next, suitable pressure is applied to the suspension and then the suspension is jet out into the air of normal pressure. As a result, water which has penetrated into the fibers expands rapidly. This causes the fibers to be sufficiently loosen and split into fibrils. When the fibrils are used for manufacturing a diaphragm, since the fibrils get sufficiently entangled together, a highly stiff and elastic diaphragm with high internal loss is obtained. Optimum fibrils are obtained by simply adjusting the pressure. Therefore, the control of the manufacturing process is simplified.
Claims15
A method for manufacturing a paper diaphragm for a loud speaker comprising the steps of:
- (1) suspending fibers consisting essentially of polysaccharide molecules in water to form a suspension;
- (2) placing said suspension formed in step (1) into a pressure-proof container;
- (3) applying pressure to said suspension in said pressure-proof container;
- (4) when said fibers swell by penetration of water into said fibers, letting out said suspension from said pressure-proof container thereby rapidly expanding said suspension so as to burst said fibers from the inside into fibrils;
- and
- (5) making a paper loud speaker diaphragm using the fibrils.
A method of manufacturing a loud speaker diaphragm, said method comprising the steps of:
- pressurizing a water suspension of fibers until the fibers swell by penetration of water into said fibers;
- rapidly de-pressurizing said water-swelled fibers so as to burst said fibers from the inside into fibrils;
- and
- making a paper loud speaker diaphragm using said fibrils.
A method of manufacturing a loud speaker diaphragm, said method comprising the steps of:
- swelling fibers with pressurized water within a pressurized container;
- releasing said pressurized swollen fibers to a lower pressure so as to explode the fibers into fibrils from inside the fiber without exerting external mechanical forces;
- and
- making a paper loud speaker diaphragm using said fibrils.
A method of manufacturing a loud speaker diaphragm, said method comprising the steps of:
- forming a water suspension of fibers consisting essentially of polysaccharide molecules;
- pressurizing said suspension in a pressure container to around 8 atmospheres of pressure;
- permitting said fibers to swell by absorption of pressurized water thereinto;
- passing the pressurized swollen fibers out of said pressure container to a lower pressure environment without exerting external impact forces to thereby burst said fibers due to their internal pressurization into fibrils;
- and
- using said fibrils to make a paper loud speaker diaphragm.
Dependencies are inferred from the claim text.