Loudspeaker

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Plural or compound reproducers

Reexamination Certificate

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Details

C181S163000, C029S594000

Reexamination Certificate

active

07809148

ABSTRACT:
A loudspeaker of improved construction includes a frame and a toroidal magnet that is affixed to the rear of the frame. The toroidal magnet has a central passageway that opens into the frame. A cap is affixed to the rear of the magnet and closes the central passageway. A guide rod is affixed to the cap and projects forwardly from the cap into the central passageway. A tubular former is slidably positioned upon the guide rod. A voice coil is wound about, and is affixed to, the tubular former. A forward cone has a narrow, rear end that is affixed to the tubular former and a wide, front end that is affixed to the front of the frame. A rearward cone has a narrow, rearward end with a central opening that loosely receives the tubular former between the rear of the frame and the rear end of the forward cone. The rearward cone also has a wide, forward end that is affixed to the frame rearwardly of the front end of the forward cone. A rearward spider is affixed to the rearward end of the rearward cone and is affixed to the rear of the frame. A forward spider is affixed to the rear end of the forward cone and is affixed to the forward end of the rearward cone.

REFERENCES:
patent: 1844787 (1932-02-01), Newill
patent: 2269284 (1942-01-01), Olson
patent: 2496589 (1950-02-01), Marquis
patent: 3213209 (1965-10-01), Doelitzsch
patent: 5594804 (1997-01-01), Kim
patent: 57190496 (1982-11-01), None
patent: 59149497 (1984-08-01), None

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