US3745263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phonograph pickup cartridge
Assignee: Individual
•
Filing: 1971-12-20
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Granted: 1973-07-10
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Expires: 1991-12-20
Abstract
Abstract A phonograph pickup cartridge which has a stylus with a pair of driving arms engageable with the ends of a pair of tapered flexible members and formed with tapered openings therein so that the movement of the stylus moves the flexible members and causes the volume of the air chambers therein to vary. A pair of electrostatic transducers are coupled to the cavities of the flexible members and have diaphragms which vary with variations in volume of the flexible members so as to produce audio output signals.
Inventors
- 👤 H Kawakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:32
CPC Classifications
H; H04; H04R; H04R19/00; H04R19/06; H04R19/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
191 words
A phonograph pickup cartridge including: a stylus supported by said cartridge; a hollow flexible member mounted in said cartridge and formed with a pair of side-by-side separated fluid-filled hollow tapered driving cavities each formed with small closed first ends that are coupled to said stylus and each formed with larger second ends; a pair of electrostatic transducers respectively fluidly coupled to the larger second ends of said pair of tapered driving cavities of said flexible member, wherein said stylus is formed with a pair of driving arms mounted at right angles to each other which respectively engage the first ends of said flexible member, and wherein each of said electrostatic transducers comprise an electrical conductive cup-shaped membr formed with an opening fluidly connected to the respective driving cavity of said flexible member, an electrical conductive diaphragm electrically connected to said cup-shaped member and mounted therein to be driven by pressure variations in the fluid in the associated driving cavity, and a second conductive electrode insulatingly mounted in said cup-shaped member and stationary relative thereto such that movement of said diaphragm produces capacitive variation between said diaphragm and said second conductive electrode.
Claim 2
Dependent Claim
191 words
A phonograph pickup cartridge including: a stylus supported by said cartridge; a hollow flexible member mounted in said cartridge and formed with a pair of side-by-side separated fluid-filled hollow tapered driving cavities each formed with small closed first ends that are coupled to said stylus and each formed with larger second ends; a pair of electrostatic transducers respectively fluidly coupled to the larger second ends of said pair of tapered driving cavities of said flexible member, wherein said stylus is formed with a pair of driving arms mounted at right angles to each other which respectively engage the first ends of said flexible member, and wherein each of said electrostatic transducers comprise an electrical conductive cup-shaped membr formed with an opening fluidly connected to the respective driving cavity of said flexible member, an electrical conductive diaphragm electrically connected to said cup-shaped member and mounted therein to be driven by pressure variations in the fluid in the associated driving cavity, and a second conductive electrode insulatingly mounted in said cup-shaped member and stationary relative thereto such that movement of said diaphragm produces capacitive variation between said diaphragm and said second conductive electrode.
Claim 3
Dependent Claim
24 words
A phonograph pickup cartridge according to claim 1 including fluid damping means mounted in each of said tapered driving cavities of said flexible member.
Claim 4
Dependent Claim
24 words
A phonograph pickup cartridge according to claim 1 wherein said electrical conductive diaphragm comprises a flexible plastic film with electrical conductive material attached thereto.
Claim 5
Dependent Claim
20 words
A phonograph pickup cartridge according to claim 3 wherein said electrical conductive material is vacuum deposited on said plastic film.
Claim 6
Dependent Claim
15 words
A phonograph pickup cartridge according to claim 4 wherein said electrical conductive material is aluminum.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |