Patent US3684830A successfully refreshed from Google Patents.
US3684830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amplifier mounted on rotor of gain control device
Assignee: Pye Electronic Products Ltd
•
Filing: 1970-02-11
•
Granted: 1972-08-15
•
Expires: 1990-02-11
Abstract
Abstract The present invention relates to amplifying arrangements of subminiature construction which are provided with means for varying the gain of the amplifier. In particular, though not exclusively, the invention relates to hearing aids of the ''''behind the ear'''' type. The amplifier circuit is supported by a disc of insulating material. Around the periphery of the disc there is a plurality of discrete areas of conductive material adapted for both external connection from the disc and connection to the amplifier circuit. At least some of these conductive areas are connected to the amplifier circuit by resistors thereby forming a gain control device for the amplifier. The disc is rotatably mounted and adapted to serve as the rotor of the gain control device.
Inventors
- 👤 Robert Gordon Maclagan
- 👤 Geoffrey William Griffiths
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:10
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/181; H03F3/183; H01; H01C; H01C10/00; H01C10/46; H01C10/48; H04; H04R; H04R25/00; H04R25/60; H04R25/603; H04R25/609; H01H; H01H19/00; H01H19/001; H01H19/02; H01H19/03; H01H2300/00; H01H2300/004; H01H9/00; H01H9/02; H01H9/0271; H04R2225/00; H04R2225/61
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
119 words
An amplifying arrangement comprising an amplifier circuit supported by a disc of insulating material rotatably mounted within a recess formed in a body of insulating material, a peripheral segment of said disc protruding beyond said recess, said disc being provided at or adjacent its periphery with a plurality of discrete areas of conductive material connected to said amplifier circuit and adapted for external connection from said disc, means individually connecting at least some of said discrete conductive areas to said amplifier circuit by way of a plurality of resistors so as to form a gain control device for the amplifier circuit that includes said resistors, said disc being adapted to serve as the rotor of said gain control device.
Claim 2
Dependent Claim
119 words
An amplifying arrangement comprising an amplifier circuit supported by a disc of insulating material rotatably mounted within a recess formed in a body of insulating material, a peripheral segment of said disc protruding beyond said recess, said disc being provided at or adjacent its periphery with a plurality of discrete areas of conductive material connected to said amplifier circuit and adapted for external connection from said disc, means individually connecting at least some of said discrete conductive areas to said amplifier circuit by way of a plurality of resistors so as to form a gain control device for the amplifier circuit that includes said resistors, said disc being adapted to serve as the rotor of said gain control device.
Claim 3
Dependent Claim
27 words
An amplifying arrangement as claimed in claim 1 in which electrical contacts are provided on said body to selectively engage with the said areas of conductive material.
Claim 4
Dependent Claim
52 words
An amplifying arrangement as claimed in claim 2 in which said disc is provided with a projection member which extends radially from said segment, said projection member engaging with one or the other shoulders formed on said body so as to limit the extent of rotation of said disc within said recess.
Claim 5
Dependent Claim
60 words
An arrangement as claimed in claim 3 in which when said disc is in a first position with said projection engaging one of said shoulders said electrical contacts are insulated from said areas of conductive material while when said disc rotatably moved to positions other than said first positions, said contacts electrically engage with their associated areas of conductive material.
Claim 6
Dependent Claim
51 words
An arrangement as claimed in claim 2 in which said disc is provided with a further discrete area of conductive material on the side opposite to that on which said amplifier circuit is supported, said further area being in continuous engagement with a further electrical contact provided on said insulating body.
Claim 7
Dependent Claim
63 words
An arrangement as claimed in claim 2 in which said first mentioned electrical contacts extend over said recess to selectively engage with said first mentioned discrete areas provided on the obverse side of said disc and adjacent the edge thereof, said first mentioned electrical contacts being arranged to exert a force on the disc so as to retain said disc within said recess.
Claim 8
Dependent Claim
34 words
An arrangement as claimed in claim 6 in which one of said contacts is adapted to be moved clear of the recess so as to allow said disc to be removed from said recess.
Claim 9
Dependent Claim
76 words
An arrangement as claimed in claim 6 wherein said disc includes a further discrete area of conductive material centrally located on the reverse side of the disc, a further electrical contact mounted on said insulating body and in continuous engagement with said further conductive area so as to exert a counter force on the disc opposite to that of said first mentioned contacts whereby the disc floats between said further contact and said first mentioned contacts.
Claim 10
Dependent Claim
64 words
A hearing aid incorporating an amplifier arrangement as claimed in claim 2 further comprising, means connecting the input of said amplifier circuit to a microphone through one of said electrical contacts, the output of said amplifier circuit to an earpiece through a second of said electrical contacts, and said amplifier circuit to a DC supply source through a further one of said electrical contacts.
Claim 11
Dependent Claim
36 words
A hearing aid as claimed in claim 9 in which said microphone, said earpiece and said supply source are housed in a casing external to said disc and in which said insulating body forms a part.
References Cited (Backward Citations)
US2393184A
Cited
US2971065A
Cited
US3061677A
Cited
DE1146545B
Cited
US3209083A
Cited
US3270146A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |