Electrodynamic transducer comprising a two-part diaphragm

Details Electrodynamic transducer comprising a two-part diaphragm Electrodynamic transducer comprising a two-part diaphragm

1986-06-06

1989-05-09

Ng, Jin F.

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Having electrostatic element

381153, 381158, 381159, 381184, 381186, 381174, 381202, 381204, H04R 718, H04R 124, H04R 704, H04R 718

Patent

active

048295817

ABSTRACT:
An electrodynamic transducer (1) comprises a diaphragm with a central part (2) and a peripheral part (3) and a voice-coil device (9, 10) coupled to the central part (2). The diaphragm (2, 3) cooperates with an enclosed volume (6), the enclosed volume being such that ##EQU1## where f.sub.o and f.sub.o ' are the anti-resonance frequencies of a transducer respectively with or without the enclosed volume behind the diaphragm. These frequencies each correspond to a local minimum situated between two maxima (f.sub.1 and f.sub.1 ' respectively, and f.sub.2 and f.sub.2 ' respectively) in the input impedance curves Z.sub.1 in the case of a transducer with the enclosed volume and in the case of a transducer without the enclosed volume. The maxima correspond to the two resonance frequencies for which the central part of the peripheral part move in phase and in phase opposition relative to one another, and S.sub.1 and S.sub.2 are the surface areas of the central part and the peripheral part, respectively, where S.sub.2 /S.sub.1 .gtoreq.2.

REFERENCES:
patent: 1459803 (1923-06-01), Steurer
patent: 2146975 (1939-02-01), Nagelvoort
patent: 3046362 (1962-07-01), White
patent: 3573396 (1971-04-01), Schoengold
patent: 4315112 (1982-02-01), Hofer
patent: 4321434 (1982-03-01), Irie
Tremaine, Howard, Audio Cyclopedia, 1969, Sections 20.29, 20.45 and 20.60.

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