Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Microphone capsule only
Patent
1997-06-20
1998-07-14
Tran, Sinh
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Microphone capsule only
381168, 381169, H04R 2500
Patent
active
057816441
ABSTRACT:
A pick-up device includes a front cover, a diaphragm incorporating a voice coil disposed posteriorly of the front cover, a front flux shield plate disposed posteriorly of the diaphragm and having a first hole, a magnet disposed at a back side of the front flux shield plate and having a second hole aligned with the first hole, a yoke disposed around the front flux shield plate and the magnet and confining a first air passage with both the front flux shield plate and the magnet, a rear flux shield plate disposed at the back sides of the magnet and the yoke and having a threaded third hole which is aligned with the second hole, the rear flux shield plate further having a second air passage which is communicated with the first air passage, an encapsulation to encompass the yoke and the rear flux shield plate, a rear cap to encompass the encapsulation and the rear flux shield plate, a screw rod passing through the rear cap and threadedly engaged with the third hole, thereby closing the third hole, and a high frequency resonance pad provided in front of the front flux shield plate and having a securing portion which extends into at least the first and second holes, the high frequency resonance pad being formed via an in-situ forming process.
REFERENCES:
patent: 2293078 (1942-08-01), Proctor
patent: 3536863 (1970-10-01), Schenkel
patent: 3585317 (1971-06-01), Dvorsky
patent: 4199667 (1980-04-01), Renner
patent: 5590211 (1996-12-01), Chang
patent: 5706359 (1998-01-01), Chang
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