Patent US4158753A successfully refreshed from Google Patents.
US4158753A
Expired / Lapsed
US
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Headphone of circumaural design
Assignee: AKG Acoustics GmbH
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Filing: 1978-01-30
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Granted: 1979-06-19
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Expires: 1998-01-30
Abstract
Abstract The headphone includes a cup-shaped case forming the coupling space and this cup-shaped case, in use, engages the user's head and encloses the user's ear. At least one electroacoustic transducer is included in the cup-shaped case, and the case either is designed as an acoustic frictional resistance or as a supporting structure of such a resistance. The headphone is equipped with acoustic and/or electrical systems compensating the drop at the low frequencies, and there are no reflecting surfaces located close to the external ear of the user. The low frequencies drop may be compensated by passive or blind diaphragms, or the diaphragm of the electroacoustic transducer may be coupled to an air mass. A headset, including two headphones, may be designed for quadraphonic reproduction.
Inventors
- 👤 Rudolf Gorike
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:37
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/28; H04R1/2807; H04R1/2811; H04R1/10; H04R1/1008; H04R1/2869; H04R1/2884; H04R1/2888
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
98 words
A headphone engageable on a person's head around the ear, comprising a cup-shaped case having an encircling rim around its periphery, a flat soft sealing strip engaged around said rim and engageable with the wearer's head around the ear having a maximum thickness of approximately three mm, said case forming a coupling space enclosing the user's ear, at least one electroacoustic transducer having a diaphragm included in cup-shaped case, acoustic frictional resistance means coextensive with all of the surfaces of said cup-shaped case, and compensating means for reduction of responses at low frequencies operatively associated with said headphone.
Claim 2
Dependent Claim
98 words
A headphone engageable on a person's head around the ear, comprising a cup-shaped case having an encircling rim around its periphery, a flat soft sealing strip engaged around said rim and engageable with the wearer's head around the ear having a maximum thickness of approximately three mm, said case forming a coupling space enclosing the user's ear, at least one electroacoustic transducer having a diaphragm included in cup-shaped case, acoustic frictional resistance means coextensive with all of the surfaces of said cup-shaped case, and compensating means for reduction of responses at low frequencies operatively associated with said headphone.
Claim 3
Dependent Claim
28 words
A headphone of circumaural design, as claimed in claim 1, in which said cup-shaped case is designed as an acoustic frictional resistance constituting said acoustic frictional resistance means.
Claim 4
Dependent Claim
30 words
A headphone of circumaural design, as claimed in claim 1, in which said cup-shaped case forms a supporting structure for an acoustic frictional resistance constituting said acoustic frictional resistance means.
Claim 5
Dependent Claim
43 words
A headphone of circumaural design, as claimed in claim 1, designed as a headphone of a stereo headset in which, in use, the electroacoustic transducer of each headphone is positioned laterally, at the front side and near said rim, of said cup-shaped case.
Claim 6
Dependent Claim
67 words
A headphone of circumaural design, as claimed in claim 1, designed as a headphone of a quadraphonic headset in which, in use, one of the electroacoustic transducers of each headphone is positioned laterally at the front side, and the other electroacoustic transducer of each headphone is positioned laterally at the rear side, both electroacoustic transducers of each headphone being near the rim of the respective cup-shaped case.
Claim 7
Dependent Claim
14 words
A headphone according to claim 1 wherein said compensating means comprises an acoustic device.
Claim 8
Dependent Claim
23 words
A headphone according to claim 1 wherein said compensating means comprises a blind diaphragm arranged closely adjacent said cup-shaped acoustic frictional resistance means.
Claim 9
Dependent Claim
24 words
A headphone according to claim 1 wherein said compensating means comprises an air mass which is coupled to the diaphragm of said electroacoustic transducer.
References Cited (Backward Citations)
US4071717A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-06-18 | 1982-12-18 | 1983-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-18 | 1986-12-18 | 1987-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-18 | 1990-12-18 | 1991-06-19 | $7700.00 | Window Closed / Lapsed |