US3855428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speaker diaphragm
Assignee: Pioneer Corp
•
Filing: 1972-10-30
•
Granted: 1974-12-17
•
Expires: 1992-10-30
Abstract
Abstract A U-shaped, annular indentation within the edge of a cone-shaped diaphragm forms a reinforcing rib within the periphery of the diaphragm and provides dual, right angle contact surfaces with the annular frame which edge supports the diaphragm at its outer periphery.
Inventors
- 👤 T Itagaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:56
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/16; H04R7/18; H04R7/22
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
171 words
In a loudspeaker having an annular thin film diaphragm, an annular frame concentrically surrounding an axially movable voice coil, said diaphragm including an annular portion with its inner peripheral edge supporting a rearwardly directed cylindrical bobbin holding said voice coil and its outer peripheral edge fixed to said frame, the improvement wherein: said frame includes an annular, right angle recess within the forward end face of the same at its inner periphery, said diaphragm includes a right angle, U-shaped annular indentation inwardly of its outer peripheral edge at a radial position corresponding to said frame recess, said indentation forming a reinforcing rib, and a right angle flange portion radially outward thereof, the radially outer sidewall of said indentation is fixed to the radially inner sidewall of said frame recess, and the right angle flange portion of said outer peripheral edge of said diaphragm, radially outwards of said radially outer sidewall, is fixed to the forward end face of said frame with the forward surface of said diaphragm free of said frame.
Claim 2
Dependent Claim
171 words
In a loudspeaker having an annular thin film diaphragm, an annular frame concentrically surrounding an axially movable voice coil, said diaphragm including an annular portion with its inner peripheral edge supporting a rearwardly directed cylindrical bobbin holding said voice coil and its outer peripheral edge fixed to said frame, the improvement wherein: said frame includes an annular, right angle recess within the forward end face of the same at its inner periphery, said diaphragm includes a right angle, U-shaped annular indentation inwardly of its outer peripheral edge at a radial position corresponding to said frame recess, said indentation forming a reinforcing rib, and a right angle flange portion radially outward thereof, the radially outer sidewall of said indentation is fixed to the radially inner sidewall of said frame recess, and the right angle flange portion of said outer peripheral edge of said diaphragm, radially outwards of said radially outer sidewall, is fixed to the forward end face of said frame with the forward surface of said diaphragm free of said frame.
Claim 3
Dependent Claim
49 words
The loudspeaker as claimed in claim 1, further comprising: an annular strip of packing material fixed at its top to the bottom wall of said U-shaped indentation and fixed at its bottom to the bottom of said annular recess within said frame to dampen the vibrations of said diaphragm.
References Cited (Backward Citations)
US3179204A
Cited
US1843367A
Cited
US2034882A
Cited
US2814353A
Cited
US3095941A
Cited
AT244415B
Cited
US3679844A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |