US4176731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-section exponential acoustical horn
Assignee: Bosch Security Systems Inc
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Filing: 1977-11-21
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Granted: 1979-12-04
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Expires: 1997-11-21
Abstract
Abstract An acoustical horn suitable for use in conjunction with an acoustical driver to form a loudspeaker has a first section between its throat and a predetermined point therealong which has a first exponential flare rate, and a second section between the predetermined point and the mouth which has a second flare rate. The flare rates are chosen to afford improved frequency response over a single section exponential horn with the same length, mouth area and throat area.
Inventors
- 👤 Rex Sinclair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:03
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/02; G10K11/025
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
58 words
A two-section exponential horn comprising: a first section between the throat of the horn and a predetermined point therealong having a first exponential flare rate, m 1 , and a second section between said predetermined point and the mouth of the horn having a second exponential flare rate, m 2 , which is greater than m 1 .
Claim 2
Dependent Claim
58 words
A two-section exponential horn comprising: a first section between the throat of the horn and a predetermined point therealong having a first exponential flare rate, m 1 , and a second section between said predetermined point and the mouth of the horn having a second exponential flare rate, m 2 , which is greater than m 1 .
Claim 3
Dependent Claim
35 words
The horn of claim 1 wherein the distance (a) between the throat of the horn and said predetermined point therealong is equal to one-fourth the distance (b) between the throat and mouth of the horn.
Claim 4
Dependent Claim
24 words
The horn of claim 1 wherein m.sub.1 =m-(0.843/b) and m.sub.2 =m+(0.281/b where b is the distance between the mouth and throat of the horn.
Claim 5
Dependent Claim
101 words
The horn of claim 1 wherein the cross-sectional area, S(l) 1 of the horn at any point between the throat of the horn and said predetermined point therealong is defined by: S(l).sub.1 =S(o)e.sup.m.sbsp.1.sup. l and the cross-sectional area, S(l) 2 of the horn at any point between said predetermined point and the mouth of the horn is defined by: S(l).sub.2 =S(a)e.sup.m.sbsp.2.sup. (1-a) where S(o) is the cross-sectional area of the throat of the horn, S(a) is the cross-sectional area at said predetermined point, and l is the distance of the point of the cross-sectional area from the throat of the horn.
Claim 6
Dependent Claim
11 words
The horn of claim 4 wherein R is equal to 0.9.
Claim 7
Dependent Claim
11 words
The horn of claim 5 wherein a is equal to 0.25b.
References Cited (Backward Citations)
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Cited
US2203875A
Cited
DE952179C
Cited
US2338262A
Cited
US2537141A
Cited
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Cited
US3930561A
Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-12-03 | 1983-06-04 | 1983-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-03 | 1987-06-04 | 1987-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-03 | 1991-06-04 | 1991-12-04 | $7700.00 | Window Closed / Lapsed |