Fibrous vibration plate for loudspeaker and production thereof
Abstract
Abstract A VIBRATION PLATE FOR A LOUDSPEAKER HAVING AN EDGE PORTION INTEGRAL THEREWITH IS PRODUCED IN SUCH A MANNER THAT A FIRST PLY HAVING A FLAGED PORTION AND A CENTRAL CONICAL PORTION AND MADE INTO UNIFORM THICKNESS IS FABRICATED BY FORMING A FIRST PLY IN A MOLD COMPRISING A MOLDING PORTION OF A VABRICATION PLATE AND STANTIALLY EQUAL TO THAT OF THE VIBRATION PLATE AND PROVIDED WITH A NUMBER OF SECTION HOLES EVENLY DISTRIBUTED OVER THE MOLDING PORTION, AND A WIRE NET EXTENDED ALONG THE ENTIRE AREA OF THE MOLDING PORTION. A SECOND PLY HAVING A MERE CONICAL PORTION AND MADE INTO A UNOFORM THICKNESS IS SECONDLY FABRICATED IN A SECOND MOLD COMPRISING A MOLDING PORTION OF A CONFIGURATION SUBSTANTIALLY EQUAL TO THAT OF THE FIRST MOLD BUT THE SUCTION HOLES BEING DISTRIBUTED OVER AMERE PORTION THEREOF CORRESPONDING TO THE CONICAL PORTION OF THE VIBTATION PLATE, AND A WIRE NET EXTENDED ALONG THE ENTIRE AREA OF THE MOLDING PORTION. THEN THE FIRST PLY AND THE SECOND PLY ARE COMBINED INTO AN INTERGALL VIBRATION PLATE BY MEANS, FOR INSTANCE, OF A HEATING PRESS.
Inventors
- 👤 Y Miki
- 👤 T Kumanogo
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |