US4376232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-acoustic transducer
Assignee: Siemens AG
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Filing: 1981-03-02
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Granted: 1983-03-08
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Expires: 2001-03-02
Abstract
Abstract The invention concerns an electro-acoustical transducer with a transducer plate having a piezo electric layer and which subdivides the housing of the transducer into a front and back chamber. In the front chamber, means are provided for the attenuation of resonance increases comprising Helmholtz resonators and an attenuation disc. According to the invention, the Helmholtz resonators are designed in such a manner that their effective surface is not reduced in size by means of the attenuation disc or wafer. This is attained according to the invention in that slots are formed in a separating plate.
Inventors
- 👤 Erwin Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:24
CPC Classifications
H; H04; H04R; H04R17/00; H04R1/00; H04R1/20; H04R1/22; H04R2499/00; H04R2499/10; H04R2499/11
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
169 words
An electro-acoustic transducer, comprising: a transducer plate arranged in a housing and which divides space within the housing into a front chamber and a rear chamber; a cover or fitting closing off the front chamber and provided with sound openings; the front chamber containing means for attenuating rises in resonance comprising a baffle plate arranged in the front chamber between the transducer plate and the cover, and wherein the cover and the baffle plate are provided with sound openings, the sound openings of the cover being arranged offset relative to the sound openings of the baffle plate; means possessing attenuating properties in the region of the baffle plate and which cover the sound openings of the baffle plate; the sound openings of the baffle plate being formed by a plurality of slots which are narrow in relation to the sound openings of the cover; and the narrow slots being assembled to form groups and each such group being adjoined by an extending opening or recess in the baffle plate.
Claim 2
Dependent Claim
169 words
An electro-acoustic transducer, comprising: a transducer plate arranged in a housing and which divides space within the housing into a front chamber and a rear chamber; a cover or fitting closing off the front chamber and provided with sound openings; the front chamber containing means for attenuating rises in resonance comprising a baffle plate arranged in the front chamber between the transducer plate and the cover, and wherein the cover and the baffle plate are provided with sound openings, the sound openings of the cover being arranged offset relative to the sound openings of the baffle plate; means possessing attenuating properties in the region of the baffle plate and which cover the sound openings of the baffle plate; the sound openings of the baffle plate being formed by a plurality of slots which are narrow in relation to the sound openings of the cover; and the narrow slots being assembled to form groups and each such group being adjoined by an extending opening or recess in the baffle plate.
Claim 3
Dependent Claim
38 words
An electro-acoustic transducer as claimed in claim 1 wherein the recess faces towards a space between the cover and the baffle plate, whereas said narrow slots face towards a space between the transducer plate and the baffle plate.
Claim 4
Dependent Claim
139 words
An electro-acoustic transducer, comprising: a transducer plate arranged in a housing and which divides space within the housing into a front chamber and a rear chamber; a cover closing off the front chamber and provided with sound openings; the front chamber containing a baffle plate having a plurality of sound openings all of which lie radially inwardly of the sound openings of the cover; an attenuating material covering the sound openings of the baffle plate and positioned in a space between the baffle plate and cover; the sound openings of the baffle plate comprising narrow rectangular slots having a width substantially less than a diameter of the sound openings in the cover; and the baffle plate sound openings comprising a recess providing an air space beneath the attenuating material, said slots being provided in a base of said recess.
Claim 5
Dependent Claim
139 words
An electro-acoustic transducer, comprising: a transducer plate arranged in a housing and which divides space within the housing into a front chamber and a rear chamber; a cover closing off the front chamber and provided with sound openings; the front chamber containing a baffle plate having a plurality of sound openings all of which lie radially inwardly of the sound openings of the cover; an attenuating material covering the sound openings of the baffle plate and positioned in a space between the baffle plate and cover; the sound openings of the baffle plate comprising narrow rectangular slots having a width substantially less than a diameter of the sound openings in the cover; and the baffle plate sound openings comprising a recess providing an air space beneath the attenuating material, said slots being provided in a base of said recess.
References Cited (Backward Citations)
DE2831411A1
Cited
US4292561A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-03-07 | 1986-09-06 | 1987-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-07 | 1990-09-06 | 1991-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-07 | 1994-09-06 | 1995-03-08 | $7700.00 | Window Closed / Lapsed |