US3824343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple driver dynamic loud speaker
Assignee: Individual
•
Filing: 1972-11-29
•
Granted: 1974-07-16
•
Expires: 1992-11-29
Abstract
Abstract A loud speaker assembly capable of producing coherent sound with multiple driver, dynamic loud speakers is provided, which assembly is characterized by sonic frequencies of the mid-range and treble frequency bands being generated by wide dispersion, dynamic transducers which are free-air mounted within an accoustically transparent enclosure. The mounting of all of the transducers in the assembly is preferably coordinated as a function of the rise time characteristics of the transducers by positioning the transducers forwardly and rearwardly in the assembly along their radiating axes with respect to a listening area, in such manner that the sound waves generated by electrical signals simultaneously impressed upon the transducers will be simultaneously impinged upon a point in the listening area equidistant from the radiating axes of the transducers.
Inventors
- 👤 J Dahlquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:41
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/26
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
163 words
A multiple transducer dynamic loudspeaker assembly comprising, in combination, a frame including an acoustically transparent front face, an enclosure within said frame, a bass radiator transducer mounted within said enclosure, strut means mounted within said frame and extending externally of said enclosure, said strut means presenting minimal area in the direction of said front face of said frame, at least two additional direct radiator dynamic transducer members positioned within said frame externally of said enclosure, said at least two transducers being supported solely by said strut means and being, with the exception of the connection to said strut means, completely surrounded by free space, the area within said frame and rearward of said at least two transducers being substantially free of sound reflective surfaces facing the front of said speaker, and a frequency dividing network means for dividing the electrical signals fed to said loudspeaker assembly into at least three discrete frequency bands, and applying an appropriate said band to each said transducer.
Claim 2
Dependent Claim
163 words
A multiple transducer dynamic loudspeaker assembly comprising, in combination, a frame including an acoustically transparent front face, an enclosure within said frame, a bass radiator transducer mounted within said enclosure, strut means mounted within said frame and extending externally of said enclosure, said strut means presenting minimal area in the direction of said front face of said frame, at least two additional direct radiator dynamic transducer members positioned within said frame externally of said enclosure, said at least two transducers being supported solely by said strut means and being, with the exception of the connection to said strut means, completely surrounded by free space, the area within said frame and rearward of said at least two transducers being substantially free of sound reflective surfaces facing the front of said speaker, and a frequency dividing network means for dividing the electrical signals fed to said loudspeaker assembly into at least three discrete frequency bands, and applying an appropriate said band to each said transducer.
Claim 3
Dependent Claim
21 words
The loudspeaker assembly in accordance with claim 1 wherein portions of said frame external of said enclosure are substantially acoustically transparent.
Claim 4
Dependent Claim
26 words
The loudspeaker assembly in accordance with claim 2 wherein said rear face of said external frame portion is of lesser acoustic transparency than said front face.
Claim 5
Dependent Claim
82 words
The loudspeaker assembly in accordance with claim 1 wherein the radiating axes of said transducers are substantially parallel and the radiating surfaces of said transducers are displaced one from the other along said axes in accordance with the rise time characteristics of said transducers a distance whereby the sound wave generated by each of said transducers responsive to an electrical signal simultaneously impressed upon said transducers will simultaneously reach a listener in front of and equI-distant from the axes of said transducers.
Claim 6
Dependent Claim
109 words
A loudspeaker assembly in accordance with claim 1 wherein the radiating axes of said transducers are disposed in substantial parallel alignment and are directed toward a listening area forwardly of said front face of said assembly, the radiating diaphragms of said transducers being displaced one from another in inverse relation to the relative rise time characteristics of the transducers whereby the transducer having a longer rise time will be disposed closer to said area, with the diaphragm of each transducer having a longer rise time than another transducer closer to a point within said listening area equi-distant from said diaphragms than each other transducer having a shorter rise time.
References Cited (Backward Citations)
US2217279A
Cited
DE1042024B
Cited
FR1216851A
Cited
US3105569A
Cited
FR1339664A
Cited
US3385929A
Cited
US3666041A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |