US3781492A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Headset
Assignee: International Standard Electric Corp
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Filing: 1972-09-22
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Granted: 1973-12-25
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Expires: 1992-09-22
Abstract
Abstract A headset includes a main housing containing a miniature demountable earphone, a microphone pre-amp and a snap-on earpiece. The housing is connected to one end of an adjustable boom having a pressure gradient microphone at the other end. The microphone has a piezoelectric disc transducer mounted midway from either end of a cylindrical housing and perpendicular thereto, the cylinder halves being separate acoustic resonators of predetermined frequency to provide an upper limit of operation.
Inventors
- 👤 W Cragg
- 👤 R Carter
- 👤 Bradshaw L Dymoke
- 👤 A Batchelor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:00
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/08; H04R1/10; H04R1/105; H04R1/1016; H04R17/00; H04R17/02; H04R5/00; H04R5/033; H04R5/0335
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
111 words
A pressure gradient microphone for a communications headset, including a housing of molded plastic formed as a hollow cylinder with both ends apertured for the ingress of sound but otherwise substantially closed and a piezoelectric disc transducer element inside the housing with its major surfaces normal to the longitudinal axis of the housing, in which the disc is mounted halfway along the cylinder by an endless ring seal between its edge and the adjacent inside surface of the housing, and in which the apertured cylinder halves on each side of the disc are acoustic resonators at a predetermined frequency to provide an upper limit of the microphone output at said frequency.
Claim 2
Dependent Claim
111 words
A pressure gradient microphone for a communications headset, including a housing of molded plastic formed as a hollow cylinder with both ends apertured for the ingress of sound but otherwise substantially closed and a piezoelectric disc transducer element inside the housing with its major surfaces normal to the longitudinal axis of the housing, in which the disc is mounted halfway along the cylinder by an endless ring seal between its edge and the adjacent inside surface of the housing, and in which the apertured cylinder halves on each side of the disc are acoustic resonators at a predetermined frequency to provide an upper limit of the microphone output at said frequency.
Claim 3
Dependent Claim
31 words
A microphone as claimed in claim 1, and in which the ring seal is of rubber or a rubber-like material such as not to apply rigid edge clamping to the disc.
Claim 4
Dependent Claim
28 words
A microphone as claimed in claim 1, and in which the cylinder halves on each side of the disc contain open celled plastic foam to provide acoustic resistance.
Claim 5
Dependent Claim
41 words
A microphone as claimed in claim 1, and in which the transducer element comprises a piezoelectric disc with an electrode on each major surface thereof, and a second disc of equal acoustic stiffness attached face to face with the piezoelectric disc.
Claim 6
Dependent Claim
18 words
A microphone as claimed in claim 4, and in which the second disc is a flexible metal disc.
Claim 7
Dependent Claim
72 words
A microphone as claimed in claim 1, in which the housing is divided transversely with respect to the longitudinal Axis of the cylinder into two open ended parts, a casing and a cap, which snap fit together, in which the ring seal secures the disc to the casing part at its open end, and in which electrical connection wires from the disc are led out of the housing through the casing part.
Claim 8
Dependent Claim
86 words
A microphone as claimed in claim 6, in which a portion of the cap part near its open end having its wall thickness reduced from the outside projects into a portion of the casing part near its open end having its wall thickness reduced from the inside, and in which the reduced end portion of the cap part is shorter than the reduced end portion of the casing part thus providing a groove in the inside surface of the housing in which the disc is located.
Claim 9
Dependent Claim
102 words
A communications headset having a pressure gradient microphone at the outer end of a boom, in which the boom is a tube carrying the microphone cable inside it, in which the longitudinal axis of the boom towards its outer end is coincident with the longitudinal axis of the microphone housing, and in which the boom and microphone configuration is such that when the apertured cylinder end of the microphone furthest from the boom is positioned in front of one corner of the user''s mouth, then the apertured cylinder end of the microphone adjacent the boom is displaced away from the user''s mouth.
Claim 10
Dependent Claim
102 words
A communications headset having a pressure gradient microphone at the outer end of a boom, in which the boom is a tube carrying the microphone cable inside it, in which the longitudinal axis of the boom towards its outer end is coincident with the longitudinal axis of the microphone housing, and in which the boom and microphone configuration is such that when the apertured cylinder end of the microphone furthest from the boom is positioned in front of one corner of the user''s mouth, then the apertured cylinder end of the microphone adjacent the boom is displaced away from the user''s mouth.
Claim 11
Dependent Claim
108 words
A communications headset as claimed in claim 8, in which the boom and microphone are held together by the outer end of the boom tube fitting into an integral tubular extension from the closed end of the casing part of the microphone housing, in which the electrical connection wires of the microphone are led through a hole in the casing closed end into the tubular extension and hence to the microphone cable in the boom tube, and in which the tubular extension is of smaller section than the casing part of the housing with sound ingress apertures being provided in the casing closed end outside the tubular extension.
Claim 12
Dependent Claim
122 words
A communications headset having an insert type earphone and a microphone, and adapted to be worn by pressure against both sides of the user''s head exerted via an under-the-chin band; in which one end of the under-the-chin band is attached to a main housing which contains the insert earphone, the housing and under-the-chin band being adapted, together with an earpiece, to position the insert earphone acoustic outlet opposite the user''s ear canal; in which a tube associated with the microphone has one end attached to the main housing and is adapted to extend adjustably around the user''s face towards his mouth; and in which the headset cable for connection to the earphone and microphone has one end attached to the main housing.
Claim 13
Dependent Claim
122 words
A communications headset having an insert type earphone and a microphone, and adapted to be worn by pressure against both sides of the user''s head exerted via an under-the-chin band; in which one end of the under-the-chin band is attached to a main housing which contains the insert earphone, the housing and under-the-chin band being adapted, together with an earpiece, to position the insert earphone acoustic outlet opposite the user''s ear canal; in which a tube associated with the microphone has one end attached to the main housing and is adapted to extend adjustably around the user''s face towards his mouth; and in which the headset cable for connection to the earphone and microphone has one end attached to the main housing.
Claim 14
Dependent Claim
69 words
A headset as claimed in claim 10, in which the under-the-chin band, microphone tube and headset cable are attached to the main housing by extending into three tubular cavities in a lower portion of the housing, and in which the earphone is in an upper portion of the housing at the front of a tubular cavity whose axis is perpendicular to the microphone tube cavity in the lower portion.
Claim 15
Dependent Claim
127 words
A headset as claimed in claim 11, in which the microphone tube is a one-piece boom carrying the microphone at its lower end near the user''s mouth, in which the upper portion of the boom is slidable up and down in its tubular cavity in the main housing, and in which a cable from the microphone is carried within the boom up into the main housing where it is led radially into a cylindrical cavity whose axis perpendicular to the tubular cavity holding the upper end of the boom and out of said cylindrical cavity on its axis, the arrangement being such that when the boom is pushed in the upper end of the microphone cable moves into the cylindrical cavity and is accommodated around its periphery.
Claim 16
Dependent Claim
46 words
A headset as claimed in claim 12, and in which the upper portion of the boom and the main housing tubular cavity in which it is accommodated are adapted to allow the boom to be rotated around its own axis through less than one Full turn.
Claim 17
Dependent Claim
92 words
A headset as claimed in claim 13, in which the upper portion of the boom has a radial projection at its top end, and in which the tubular cavity holding the upper portion of the boom has a portion extending for part of its length with a sector of diameter greater than the boom to accommodate said radial extension at the top of the boom, the length and the sector size of said portion being adapted together with said radial extension to limit the sliding and rotative movements respectively of the boom.
Claim 18
Dependent Claim
82 words
A headset as claimed in claim 12, in which the main housing is a two-part molded plastic comprising a cover portion on the back of a casing portion, in which the tubular cavity holding the upper portion of the microphone boom is formed by a groove in the back of the casing and a cooperating groove in the cover, and in which the cylindrical cavity accommodating the upper end of the microphone cable is partly formed by a recess in the cover.
Claim 19
Dependent Claim
37 words
A headset as claimed in claim 15, and in which the cylindrical cavity accommodating the upper end of the microphone cable is coaxial with the tubular cavity at the front of which the insert earphone is located.
Claim 20
Dependent Claim
19 words
A headset as claimed in claim 16, and in which a microphone preamplifier is housed behind the insert earphone.
Claim 21
Dependent Claim
48 words
A headset as claimed in claim 15, and in which the two tubular cavities in the main housing into which extend the under-the-chin band and headset cable respectively are side by side in a separate plane from the tubular cavity holding the upper portion of the microphone boom.
Claim 22
Dependent Claim
35 words
A headset as claimed in claim 10, and in which the under-the-chin band is detachably attached to the main housing so that use as a handset is enabled by the removal of the under-the-chin band.
Claim 23
Dependent Claim
109 words
A communications headset comprising a one-piece boom which mounts a microphone at its lower end, wherein the upper portion of the boom is slidable up and down in a tubular cavity in a main housing, and a cable from the microphone is carried within the boom up into the main housing where it is led radially into a cylindrical cavity whose axis is perpendicular to the tubular cavity holding the upper end of the boom and out of said cylindrical cavity on its axis, whereby when the boom is pushed in, the upper end of the microphone cable moves into the cylindrical cavity and is accommodated around its periphery.
Claim 24
Dependent Claim
109 words
A communications headset comprising a one-piece boom which mounts a microphone at its lower end, wherein the upper portion of the boom is slidable up and down in a tubular cavity in a main housing, and a cable from the microphone is carried within the boom up into the main housing where it is led radially into a cylindrical cavity whose axis is perpendicular to the tubular cavity holding the upper end of the boom and out of said cylindrical cavity on its axis, whereby when the boom is pushed in, the upper end of the microphone cable moves into the cylindrical cavity and is accommodated around its periphery.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |