US4596903A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pickup device for picking up vibration transmitted through bones
Assignee: Pilot Corp
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Filing: 1984-04-27
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Granted: 1986-06-24
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Expires: 2004-04-27
Abstract
Abstract A pickup device for picking up vibration transmitted through bones or solid members in human, in which a piezoelectric element is mounted like a cantilever within a substantially rigid liquid-tight case filled with a viscous liquid in such a way that the free end of the piezoelectric element can vibrate with respect to the liquid-tight case. The viscosity of the viscous liquid ranges from 30 to 10,000 cs so that the sharpness of resonance of the piezoelectric element can be suitably suppressed.
Inventors
- 👤 Naomi Yoshizawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:48
CPC Classifications
H; H04; H04R; H04R17/00; H04R17/02; G; G01; G01H; G01H11/00; G01H11/06; G01H11/08; H04R1/00; H04R1/46
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
116 words
A pickup device for detecting auditory vibrations transmitted through bones or other rigid members in a human body, comprising: a substantially rigid liquid-tight case having a cavity therein, a cantilever-like piezo-electric element having a first end fixed to said case so as to vibrate therewith when said case vibrates in response to auditory vibrations, and a free second end extending into said cavity; and a viscous liquid having a viscosity in the range 30 cs to 10,000 cs, filling said cavity so as to dampen resonant vibrations of said free end of said piezo-electric element; said piezo-electric element having a resonant frequency greater than 1.5 KHz and exhibiting a Q in said device less than 3.
Claim 2
Dependent Claim
116 words
A pickup device for detecting auditory vibrations transmitted through bones or other rigid members in a human body, comprising: a substantially rigid liquid-tight case having a cavity therein, a cantilever-like piezo-electric element having a first end fixed to said case so as to vibrate therewith when said case vibrates in response to auditory vibrations, and a free second end extending into said cavity; and a viscous liquid having a viscosity in the range 30 cs to 10,000 cs, filling said cavity so as to dampen resonant vibrations of said free end of said piezo-electric element; said piezo-electric element having a resonant frequency greater than 1.5 KHz and exhibiting a Q in said device less than 3.
Claim 3
Dependent Claim
38 words
A pickup device as in claim 1, wherein said viscous liquid is a liquid selected from the group of viscous liquids consisting of paraffin chloride, high-molecular plasticizer, glycol, mineral oil, motor oil, organic solvent, prepolymer and epoxy resin.
Claim 4
Dependent Claim
29 words
A pickup device as in claim 1, wherein said case has a small hole for filling said cavity with said viscous liquid and a plug closing said small hole.
References Cited (Backward Citations)
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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) | 1989-06-23 | 1989-12-23 | 1990-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-23 | 1993-12-23 | 1994-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-23 | 1997-12-23 | 1998-06-24 | $7700.00 | Window Closed / Lapsed |