Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Having electrostatic element
Patent
1990-03-29
1992-06-30
Dwyer, James L.
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Having electrostatic element
381192, 381194, 381202, 381204, H04R 2500
Patent
active
051270609
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to audio transducers.
BACKGROUND ART
Audio transducers, specifically loud speakers and microphones, have been disclosed in a variety of forms. One such audio transducer is disclosed in my previously issued U.S. Pat. No. 4,584,439, Audio Transducer With Controlled Flexibility Diaphragm. That patent discloses the provision of string-like supports which are secured to the diaphragm and extend to the transducer framework. Nylon string was used as the preferred material to support the center expanse of the diaphragm in the transducer of the patent.
Although nylon string performed adequately for its intended purpose, the use of a non-resilient, string-like material did not allow completely free movement of the diaphragm at high frequencies and prevented adequate diaphragm movement at lower frequencies.
Further, the construction of the transducer described in the patent did not provide for an adjustable mechanism which would facilitate adjustment of the central expanse of the diaphragm relative to the magnets surrounding the central expanse. In some instances, the central expanse of the diaphragm would come in contact with the magnets of the transducer, thereby creating an undesirable buzzing sound. This situation prevented manufacture of a transducer having a narrow gap between a magnetic field generator.
An object of the instant invention is to provide an improved centering device for an audio transducer.
Another object of the instant invention is to provide an adjustable diaphragm centering device for an audio transducer.
A further object of the instant invention is to provide a centering device which is passive or acoustically transparent, over a first selected portion of the transducer's operating range while being active, i.e., restricting movement of the transducer diaphragm, over a second selective portion of the transducer's operating range.
Another object of the instant invention is to provide an improved centering device in a frame which facilitates adjustable placement of the centering device.
Still another object of the instant invention is to provide a centering device having elastic, resilient characteristics.
A further object of the invention is to provide grommet means which serve as a form for a coil in the transducer.
Yet another object of the instant invention is to provide a centering device for a transducer which damps out non-linear characteristics of a diaphragm of the transducer.
DISCLOSURE OF THE INVENTION
The improved centering device of the instant invention is intended for use in an audio transducer having a diaphragm which includes a pair of elongate, resilient webs, having intermediate portions disposed with one beside the other and joined to each other to form a moveable expanse in the diaphragm. The expanse extends substantially in a plane and is moveable in the direction of the plane The webs of the diaphragm have flexible curved end portions which extend from the expanse and are secured to a transducer frame An electric coil is attached to the expanse of the diaphragm. Opposed magnets are provided for producing opposing magnetic fields which extend normal to the expanse. The transducer is connected to an audio amplifier.
The transducer frame includes a top and a base A spacer extends between the top and base and includes a center portion which has a pair of opposed magnet-receiving chambers. Spacer panels are provided which radiate outwardly from the center portion, extending between the top and the base, in a substantially X-shaped array. The center portion has a gap between the chambers for receiving the diaphragm expanse.
A grommet extends through the diaphragm expanse normal to the plane thereof and fixes a resilient, elongate cylindrical member to the diaphragm. A clamp is adjustably secured to the frame and holds the centering member and the expanse in a desired position.
These and other objects and advantages of the invention will be more fully apparent as the description which follows is read in conjunction with the drawings.
REFERENCES:
patent: 3477540 (1969-11-01), Rizo-Patron
patent: 3686446 (1972-08-01), Manger
patent: 4464785 (1984-08-01), Kagdis
patent: 4584439 (1986-04-01), Paddock
patent: 4665550 (1987-05-01), Haas
patent: 4903308 (1990-02-01), Paddock et al.
Cumming William
Dwyer James L.
Linaeum Corporation
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