Electrostatic electroacoustic transducer专利检索-电声换能器传感器变压器和转换设备专利检索查询-专利查询网

Electrostatic electroacoustic transducer

阅读：383发布：2022-05-12

专利汇可以提供Electrostatic electroacoustic transducer专利检索，专利查询，专利分析的服务。并且An electroacoustic transducer apparatus for electrostatically transducing audio frequencies from electrical signals to sound or from sound to electrical signals. One embodiment includes a headset having a pair of insulated electrodes positionable on opposite sides of and in contact with a wearer''s head near the auditory centers. A single-channel audio signal is coupled through an isolation transformer and a fixed or automatic d.c. bias circuit to the electrodes. Each electrode and the adjacent head tissue form plates of a capacitor and the insulation there between constitutes the dielectric. On application of an electric audio signal, the tissue is caused to vibrate and propagate pressure waves in accordance with the frequency and amplitude of the signal and thereby produce monaural sound reproduction. In another embodiment, two stereo channels of electric audio signals are similarly coupled to the headset electrodes with their common output coupled to a third uninsulated electrode in contact with the wearer''s body for producing three-dimensional sound reproduction. In still another embodiment, an insulated electrode constitutes a sound pickup having its output connected through a d.c. bias circuit directly to the input of an audio signal responsive device such as a loud speaker system or recorder. When held against the wearer''s head near the vocal center, the electrode and the tissue adjacent thereto act as the plates of a capacitor and the insulation constitutes the dielectric. Vibration of the tissue due to sound propogation from the vocal center produces an electric signal in accordance with the frequency and amplitude of the vibration.，下面是Electrostatic electroacoustic transducer专利的具体信息内容。

权利要求

1. Electroacoustic audio frequency transducer apparatus comprising, in combination: a plate-shaped electrode forming a plane surface on one side; a thin sheet of solid plastic dielectric material having one side continuously directly intimately physically contacting and secured to said surface and the other side formed to directly engage and intimately contact a given predetermined stationary portion of a user''s skin for direct acoustic coupling therewith and direct transfer therebetween of audio frequency signals; and d.c. bias means having two output terminals, one of said terminals electrically connected to said electrode, and the other of said terminals formed to be operatively connected to the user''s skin.

2. Electroacoustic audio frequency transducer apparatus comprising, in combination: a step-up transformer having a primary winding adapted to be connected across a source of audio signal varying about ground datum in frequency and voltage amplitude, and a secondary winding, for increasing the voltage amplitude of the audio signal; a d.c. bias means having two input terminals connected across the secondary winding for producing the increased audio signal above the ground datum two output terminals thereof; a pair of separate and independent plastic dielectric covered electrode means formed to be held in continuous stationary direct acoustic coupling engagement against a given stationary portion of a wearer''s skin in the vicinity of the ears for direct transfer thereto of audio frequency signals and electrically connected to respective ones of the output terminals of said d.c. bias means; and said transformer being formed to match the impedance of the source and the total impedance of said d.c. bias means and said electrode means when held against the skin.

3. Apparatus according to claim 2 wherein each of said electrode means comprises: a housing having an opening and filled with sound absorbing material; a solid-plastic-dielectric-covered annular conductor formed on one surface for directly intimately physically continuously contacting a given location on the wearer''s skin for direct transfer thereto of audio frequency signals; and means for resiliently supporting said conductor about the periphery of said opening.

4. Electroacoustic audio frequency transducer apparatus comprising, in combination: a step-up transformer having two primary windings adapted to be connected respectively across two sources of audio signals independently varying about ground datum in frequency and voltage amplitude, and corresponding secondary windings having one end of each connected in common to ground, for increasing the voltage amplitude of the audio signals; a d.c. bias means having two input terminals connected across both secondary windings for producing the increased audio signals above ground datum at two output terminals thereof; a pair of separate and independent solid-plastic-dielectric-covered electrode means formed to be held in continuous stationary direct acoustic coupling engagement against a given predetermined portion of a wearer''s skin in the vicinity of the ears for direct transfer thereto of audio frequency signals and electrically connected to respective ones of the output terminals of said d.c. bias means; an uninsulated ground electrode formed to intimately contact the wearer''s body; and said transformers being formed to match the impedance of the source and the total impedance of said d.c. bias means and said electrode means when held against said portion of the skin.

5. Apparatus according to claim 4 wherein each of said electrode means comprises: a housing having an opening and filled with sound absorbing material; a solid-plastic-dielectric-covered annular conductor formed on one surface for directly continuously intimately contacting and acoustic coupling with the given portion of the wearer''s body; and means for resiliently supporting said conductor about the periphery of said opening.

6. Apparatus according to claim 1 wherein said d.c. bias means further comprises: an isolation resistor connected at one end to said electrode; a regulated d.c. voltage source connected between the other end of said resistor and ground; a capacitor connected at one end to said input terminal; and amplifier means connected to the other end of said capacitor and having respective output terminals connected to the output terminals of said bias means, one of said terminals being grounded.

7. An electroacoustic audio frequency microphone comprising: an electrically conductive housing having an opening, the periphery of said opening exposed for intimately directly continuously contacting and acoustically coupling with a given predetermined stationary area of a surface capable of vibrating acoustically; an electrical insulator mounted in said opening; a plate-shaped electrode supported by said insulator having a plane surface adjacent to said opening; and a solid plastic electrically polarized dielectric plate having one side directly intimately contacting and secured on said surface of said electrode and having the other side at said opening exposed for continuously intimately directly contacting and acoustic coupling with a given predetermined stationary portion of an adjacent area of said surface capable of vibrating acoustically for direct transfer therebetween of audio frequency signals.

8. In an electrical apparatus including a source of audio frequency electrical signals having a pair of output terminals; an electroacoustic audio frequency transducer for continuous stationary direct physical acoustic coupling engagement with a predetermined given portion of the body tissue of a wearer, and having a first conductor for connection to one of said output terminals, and a second conductor for connection between the other of said output terminals and the body tissue of the wearer; the improvement wherein said transducer comprises: a conductive electrode connected to said first conductor and having a principal contact surface; and an electrically polarized sheet of solid plastic dielectric material having a first principal surface for direct continuous physical contact and acoustic coupling engagement with a given predetermined stationary portion of the body tissue of the wearer for direct transfer therebetween of audio frequency signals and a second principal surface covering said principal contact surface of said electrode and secured in direct physical intimate acoustic coupling contact therewith.

9. In an electrical apparatus including an amplifier having a pair of input terminals; an electroacoustic audio frequency microphone transducer for continuous direct physical and acoustic coupling engagement with a source of acoustic vibrations, and having a first conductor for connection to one of said input terminals, and a second conductor for connection between the other of said output terminals and a surface operatively connected with a source of vibrations; the improvement wherein said transducer comprises: a conductive electrode connected to said first conductor and having a principal contact surface; and an electrically polarized sheet of solid plastic dielectric material having a first principal surface for continuous direct physical acoustic coupling engagement and contact with a given predetermined stationary portion of the surface operatively connected with a source of vibrations for direct transfer therebetween of audio frequency signals and said dielectric material having a second principal surface covering and secured in direct acoustic coupling engagEment with said principal contact surface of said electrode.

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Electrostatic electroacoustic transducer

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