US4570742A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microphone apparatus
Assignee: Sony Corp
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Filing: 1983-09-09
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Granted: 1986-02-18
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Expires: 2003-09-09
Abstract
Abstract A microphone apparatus is disclosed which consists of a plain plate with a constant area and a microphone element located on the plain plate at its peripheral position at least different from the center thereof.
Inventors
- 👤 Tadashi Takise
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:48
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/32; H04R1/34; H04R1/342; H04R5/00; H04R5/027
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
105 words
A microphone apparatus comprising a rigid plate having a plain surface with a predetermined area, and a microphone element attached to said rigid plate so as to locate its sound receiving point at a peripheral position which is different from the center of said plate and a sound source spaced a vertical distance from said plain surface such that a sound pressure signal directly reaching said microphone element from said sound source has practically the same phase over the entire audible frequency band as signals caused by non-direct or reflecting waves on said plain surface, respectively at the sound receiving point of said microphone element.
Claim 2
Dependent Claim
105 words
A microphone apparatus comprising a rigid plate having a plain surface with a predetermined area, and a microphone element attached to said rigid plate so as to locate its sound receiving point at a peripheral position which is different from the center of said plate and a sound source spaced a vertical distance from said plain surface such that a sound pressure signal directly reaching said microphone element from said sound source has practically the same phase over the entire audible frequency band as signals caused by non-direct or reflecting waves on said plain surface, respectively at the sound receiving point of said microphone element.
Claim 3
Dependent Claim
16 words
A microphone apparatus as claimed in claim 1, wherein said rigid plate is a plain disc.
Claim 4
Dependent Claim
17 words
A microphone apparatus as claimed in claim 1, wherein said rigid plate is a plain square plate.
Claim 5
Dependent Claim
40 words
A microphone apparatus as claimed in claim 1, wherein said microphone element is located at a position apart from the center of said rigid plate by 3/4 a where a is the radius or 1/2 side of the rigid plate.
Claim 6
Dependent Claim
48 words
A microphone apparatus as claimed in claim 1, wherein said microphone element consists of a pair of microphone elements which are located at symmetrical positions apart from the center of said rigid plate by 3/4 a where a is the radius or 1/2 side of said rigid plate.
Claim 7
Dependent Claim
22 words
A microphone apparatus as claimed in claim 1 further comprising a sound absorbing member of a constant thickness on said rigid plate.
References Cited (Backward Citations)
US2457527A
Cited
US4314098A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-02-17 | 1989-08-19 | 1990-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-17 | 1993-08-19 | 1994-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-17 | 1997-08-19 | 1998-02-18 | $7700.00 | Window Closed / Lapsed |