Thin speaker having an enclosure with an open portion and a clos

Details Thin speaker having an enclosure with an open portion and a clos Thin speaker having an enclosure with an open portion and a clos

1989-11-28

1991-12-17

Dwyer, James L.

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

381159, 381186, 381182, 381194, 181145, 181160, H04R 2500, H04R 700, H05K 500

Patent

active

050739468

ABSTRACT:
A speaker which is thin but which is capable of providing high-fidelity reproduction and ensuring a suitable level of sound pressure even when it is brought close to a wall. A closed chamber is formed behind one part of a disphragm mounted in an enclosure, and an open chamber is formed behind another part of the diaphragm. At least one voice coil driver unit is connected to the diaphragm. The phase difference between sounds radiated from the front and rear surfaces of the diaphragm is increased as large as possible by using an acoustic duct for the sound radiated through the open chamber, thereby minimizing cancellation of sounds and improving the sound pressure level.

REFERENCES:
patent: 2632055 (1953-03-01), Parker
patent: 3204031 (1965-08-01), Gorike et al.
patent: 3688864 (1972-09-01), Guss
patent: 3858679 (1975-01-01), Askins
patent: 4122302 (1978-10-01), Bobb
patent: 4213008 (1980-07-01), Helffrich
patent: 4426556 (1984-01-01), Saiki et al.
patent: 4899390 (1990-02-01), Takawa et al.

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