Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Having acoustic wave modifying structure
Reexamination Certificate
2005-11-22
2005-11-22
Le, Huyen (Department: 2646)
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Having acoustic wave modifying structure
C381S371000, C381S420000, C381S430000
Reexamination Certificate
active
06968069
ABSTRACT:
A vented tweeter with a low profile particularly suited for automotive applications where the mounting depth is limited. The tweeter comprises a motor with a central air passage extending through it and a lateral air chamber formed around it. Radial channels on the top of the motor connect the air gap in the motor with the central air passage, and radial channels under the motor connect the central air passage with the lateral air chamber. As the diaphragm oscillates, air can move back and forth between the air gap around the magnet and lateral space outside the motor. This configuration substantially increases the volume of air that can be acted on by the diaphragm without significantly increasing the length of the assembled tweeter or compromising the power of the motor. To enhance the power of the motor, a secondary magnet can be included above the top plate.
REFERENCES:
patent: 3496307 (1970-02-01), Sotome
patent: 4239945 (1980-12-01), Atoji et al.
patent: 4742887 (1988-05-01), Yamagishi
patent: 5844998 (1998-12-01), Nageno
Danish Sound Technology, Website, Scan-speak brand Tweeter Model No. D2904/600000, Larkspur, CO., on sale prior to the filing date of the above styled application. Print out of website (4 pages) attached as Exhibit A.
Danish Sound Technology, Photographs of Scan-speak brand tweeter Model No. D2904/600000, Larkspur, CO., on sale prior to the filing date of the above styled application. Photgraphs (2 pages) attached as Exhibit B.
Le Huyen
Lee Mary M.
Stillwater Designs & Audio, Inc.
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