Electrostatic discharge protector for an electret microphone
First Claim
1. A sleeve for supporting and shielding from electrostatic discharge an electret microphone installed within said sleeve, the sleeve being made of insulating material and comprising at least two generally coaxial, adjoining, open-ended sleeve portions, a first one of the sleeve portions having a relatively small internal diameter substantially identical to the external diameter of the microphone to be installed and a second one of the sleeve portions having a relatively large internal diameter, stop means located within the first sleeve portion and arranged to abut a front surface portion of the microphone to limit the extent to which the microphone can be inserted within the first sleeve portion via the second sleeve portion such that a rear portion of the microphone will project into the second sleeve portion with the entire microphone contained within the sleeve, and at least one aperture extending through the second sleeve portion to provide an acoustic passage to the rear portion of the microphone when installed.
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Accused Products
Abstract
A holder for an electret microphone of the type having a front acoustic aperture and peripheral acoustic apertures is made of insulating material and includes a first sleeve portion of a diameter to receive the microphone snugly and a second sleeve portion of larger diameter. An internal stop limits the extent to which the microphone can be inserted such that the rear portion of the microphone projects into the second sleeve portion. Through holes in the second sleeve portion provide an acoustic passage to the peripheral acoustic apertures. The internal stop is in one embodiment formed by an apertured web. In another embodiment an internal shoulder forms the stop but in that embodiment too an apertured web is provided. A concentric small cylinder extends from the web in that case and terminates short of the shoulder. In either embodiment, a rectangular plate is molded with the sleeves and this forms the cover of a microphone enclosure. The invention retains or enhances the acoustic response of conventional mounting system while providing protection against electrostatic discharge.
44 Citations
15 Claims
- 1. A sleeve for supporting and shielding from electrostatic discharge an electret microphone installed within said sleeve, the sleeve being made of insulating material and comprising at least two generally coaxial, adjoining, open-ended sleeve portions, a first one of the sleeve portions having a relatively small internal diameter substantially identical to the external diameter of the microphone to be installed and a second one of the sleeve portions having a relatively large internal diameter, stop means located within the first sleeve portion and arranged to abut a front surface portion of the microphone to limit the extent to which the microphone can be inserted within the first sleeve portion via the second sleeve portion such that a rear portion of the microphone will project into the second sleeve portion with the entire microphone contained within the sleeve, and at least one aperture extending through the second sleeve portion to provide an acoustic passage to the rear portion of the microphone when installed.
- 6. A sleeve for supporting and shielding from electrostatic discharge an electret condenser microphone installed within said sleeve, the sleeve being made of insulating material and comprising a generally rectangular plate portion for forming a cover of a microphone enclosure, at least two generally coaxial, adjoining, open-ended sleeve portions attached to the one side of the plate portion such that the sleeve portions have a central axis which is substantially parallel to the plane of the plate portion and the sleeve portions are contained completely within the rectangular confines of the plate portion, a first one of the sleeve portions having a relatively small internal diameter substantially identical to the external diameter of the microphone to be installed and a second one of the sleeve portions having a relatively large internal diameter, stop means located within the first sleeve portion and arranged to abut a front surface portion of the microphone to limit the extent to which the microphone can be inserted within the first sleeve portion via the second sleeve portion such that a rear portion of the microphone will project into the second sleeve portion with the entire microphone contained within the sleeve portions, and at least one aperture extending through the second sleeve portion to provide an acoustic passage to the rear portion of the microphone when installed.
Specification