Abstract: A microphone includes a plurality of microphone units; in which the microphone units include a first group of microphone units and a second group of microphone units, the first group of microphone units and the second group of microphone units are disposed alternately, the first group of microphone units are connected in series such that outputs from the first group of microphone units are added and outputted as an added output, the second group of microphone units are connected in series such that outputs from the second group of microphone units are added and outputted as another added output, and the added output of one of the first group of microphone units and the second group of microphone units is output from a hot terminal as a balanced output and the other added output is output from a cold terminal as a balanced output.

Abstract: There is provided a condenser microphone unit in which the shield of a shielding member that covers a front acoustic terminal from the inside of a unit case is assured to prevent noise caused by electromagnetic waves radiated especially from a cellular phone from being generated. In a condenser microphone unit including a metallic cylindrical unit case 10 having a front acoustic terminal 11 on one end side; an electrostatic acousto-electric converter 20 housed in the unit case 10; and a shielding member 30 disposed between the acousto-electric converter 20 and the front acoustic terminal 11 to cover the front acoustic terminal 11 from the inside of the unit case 10, as the shielding member 30, there is used a shielding plate 32 consisting of a metallic porous plate integrally having a plurality of locking pieces 33, which dig into the inner wall surface of the unit case 10 on account of elastic deformation, in the peripheral edge part thereof.

Abstract: There is provided a unidirectional condenser microphone unit in which the shield performance of a rear acoustic terminal is assured by simple assembling work without an increase in cost.

Abstract: A condenser microphone includes a unidirectional microphone unit including a cylindrical metallic unit case having a front audio terminal on a front surface and a rear audio terminal on a side surface; an acoustoelectric converter having a diaphragm and a backplate, disposed in the metallic unit case; and a metal mesh covering a rear audio terminal from an inside of the unit case. A coil spring having an outside diameter larger than an inside diameter of the unit case is disposed in the unit case to thereby press the metal mesh against the inner wall surface of the unit case to contact the metal mesh with the unit case.

Abstract: In a boundary microphone, a high-frequency current caused by extraneous electromagnetic waves is prevented from flowing into a microphone case via a microphone cord that is drawn into the microphone case. A portion in which the microphone cord 31 consisting of a two-core shield covered wire is drawn into the microphone case 1 is made a shielding wire exposed part 310 formed by removing a skin 31d, and the shielding wire exposed part 310 is connected electrically to a base part 10 via an electrical connecting means 40 (preferably, a conductive cloth 41, and further preferably, the conductive cloth 41 that is formed into a washer shape having an insertion hole for the shielding wire exposed part 310 and is arranged so as to close a cord insertion hole 12), whereby the high-frequency current caused by extraneous electromagnetic waves is surely prevented from flowing into the microphone case 1.

Abstract: There is provided a dynamic microphone in which vibration noise generated by the rolling of a microphone unit caused by a vibration component perpendicular to the principal axis direction of the microphone is reduced effectively. In the dynamic microphone including a microphone unit 110, an inner cylinder 120 having a back air chamber. in the structure thereof constituting a microphone body 10 together with the microphone unit 110, and a microphone casing 20 serving as an outer cylinder, in which a part of the inner cylinder 120 of the microphone body 10 is supported by a floating type vibration-proof structure using an elastic member 30, a weight 40 for causing the center of gravity O of the microphone body 10 to coincide with a supporting point S using the elastic member 30 is attached to the inner cylinder 120 so as to be preferably movable.

Abstract: There is provided a variable directional microphone including dynamic microphone units that is small in size and has good directional frequency response. In a variable directional microphone 1A in which a unidirectional first dynamic microphone unit (front-side unit) 1F and a second dynamic microphone unit (rear-side unit) 1R, which has substantially the same configuration as that of the front-side unit 1F and is provided with an output adjusting means of sound signal, are provided as a pair; the front-side unit 1F and the rear-side unit 1R are arranged coaxially so that the directivity axes thereof are directed to the directions 180° opposite to each other; and the output signals of the front-side unit 1F and the rear-side unit 1R are generated via a signal synthesis circuit, one rear air chamber 1b is used in common by the front-side unit 1F and the rear-side unit 1R.

Abstract: There is provided a condenser microphone unit in which the shield of a shielding member that covers a front acoustic terminal from the inside of a unit case is assured to prevent noise caused by electromagnetic waves radiated especially from a cellular phone from being generated. In a condenser microphone unit including a metallic cylindrical unit case 10 having a front acoustic terminal 11 on one end side; an electrostatic acousto-electric converter 20 housed in the unit case 10; and a shielding member 30 disposed between the acousto-electric converter 20 and the front acoustic terminal 11 to cover the front acoustic terminal 11 from the inside of the unit case 10, as the shielding member 30, there is used a shielding plate 32 consisting of a metallic porous plate integrally having a plurality of locking pieces 33, which dig into the inner wall surface of the unit case 10 on account of elastic deformation, in the peripheral edge part thereof.

Abstract: There is provided a unidirectional condenser microphone unit in which the shield performance of a rear acoustic terminal is assured by simple assembling work without an increase in cost.

Abstract: In a condenser microphone unit connected to an output module section via a dedicated microphone cord, the generation of noise caused by strong electromagnetic waves sent from a cellular phone etc. is effectively prevented by a simple configuration. In the condenser microphone unit in which a microphone capsule 10 is supported, for example, exchangeably on a support enclosure 20 and a microphone cord 30 consisting of a two-core shield covering line for connecting the condenser microphone unit to the output module section is pulled into the support enclosure 20, a shield covering line exposure portion 33a, in which a shield covering line 33 is stripped off, is provided in a portion in which the microphone cord 30 is pulled into the support enclosure 20, and a fixing member 40 formed into a doughnut shape is fixed to the shield covering line exposure portion 33a by staking, by which the shield covering line 33 is connected to the support enclosure 20 via the fixing member 40.

Abstract: In a boundary microphone, a high-frequency current caused by extraneous electromagnetic waves is prevented from flowing into a microphone case via a microphone cord that is drawn into the microphone case. A portion in which the microphone cord 31 consisting of a two-core shield covered wire is drawn into the microphone case 1 is made a shielding wire exposed part 310 formed by removing a skin 31d, and the shielding wire exposed part 310 is connected electrically to a base part 10 via an electrical connecting means 40 (preferably, a conductive cloth 41, and further preferably, the conductive cloth 41 that is formed into a washer shape having an insertion hole for the shielding wire exposed part 310 and is arranged so as to close a cord insertion hole 12), whereby the high-frequency current caused by extraneous electromagnetic waves is surely prevented from flowing into the microphone case 1.

Abstract: Cavity resonance is prevented from being produced in a microphone case by strong electromagnetic waves of a cellular phone level in a boundary microphone provided with a flat microphone case having a relatively large internal space. In the boundary microphone including the microphone case 1 made up of a flat metallic base part 10 the upper surface of which is open and a metallic microphone cover 20 having a large number of openings (sound wave introduction holes), which is attached to the base part 10 so as to cover the upper surface of the base part 10, in which at least a microphone unit 31 and a circuit board 30 on which a predetermined electric circuit is formed are housed in the microphone case 1, the space in the microphone case 1 is filled with a filler (for example, a metallic wool material or a conductive sponge material) 50 having electric conductivity, permeability, and elasticity in combination.

Abstract: The electromagnetic shield at a rear audio terminal covered with a metal mesh in a unidirectional microphone unit is ensured. In a condenser microphone including the unidirectional microphone unit 10A incorporating an acoustoelectric converter 30, in which a diaphragm and a backplate are arranged opposedly via a spacer member, in a cylindrical metallic unit case 20 having a front audio terminal 21 on the front surface thereof and the rear audio terminal 22 on the side surface thereof, in which the metal mesh 40 covering the rear audio terminal 22 from the inside is provided in the unit case 20, a coil spring 50 which presses the metal mesh 40 against the inner wall surface of the unit case 20 is provided in the unit case 20.

Abstract: The present invention provides a low noise phantom powered capacitor microphone and a method of using a vacuum tube as an impedance converter of the microphone capsule in the capacitor microphone with no exclusive power supply. In the phantom powered capacitor microphone of which a vacuum tube V01 is used as the impedance converter, a part of the voltage supplied from the phantom power supply is converted to a predetermined voltage by one or more switched capacitor voltage converters, for example, by three switched capacitor voltage converters IC01, IC02 and IC03 seriously connected as three stages to obtain the heater voltage of the vacuum tube V01.

Abstract: The present invention relates to a capacitor microphone which is characterized that even in a microphone with a small diameter such as a lavalier microphone, the noneffective electrostatic capacitance enables to be decreased and a better signal-to-noise ratio enables to be obtained. As shown in FIG. 2, in the capacitor microphone in which a vibration plate 10 strained and fixed on a support ring 11 and a charge back-plate 20 supported on one end-side of a cylinder base 21 face each other and are disposed through a spacer forming a gap, the spacer 30A having at least three spacer pieces, in which the each spacer piece has the same thickness and is disposed apart from the adjacent spacer pieces at generally equal angle on the same circumference, in place of the ring-shaped spacer.

Abstract: In a condenser microphone unit connected to an output module section via a dedicated microphone cord, the generation of noise caused by strong electromagnetic waves sent from a cellular phone etc. is effectively prevented by a simple configuration. In the condenser microphone unit in which a microphone capsule 10 is supported, for example, exchangeably on a support enclosure 20 and a microphone cord 30 consisting of a two-core shield covering line for connecting the condenser microphone unit to the output module section is pulled into the support enclosure 20, a shield covering line exposure portion 33a, in which a shield covering line 33 is stripped off, is provided in a portion in which the microphone cord 30 is pulled into the support enclosure 20, and a fixing member 40 formed into a doughnut shape is fixed to the shield covering line exposure portion 33a by staking, by which the shield covering line 33 is connected to the support enclosure 20 via the fixing member 40.

Abstract: The present invention relates to a capacitor microphone which is characterized that even in a microphone with a small diameter such as a lavalier microphone, the noneffective electrostatic capacitance enables to be decreased and a better signal-to-noise ratio enables to be obtained. As shown in FIG. 2, in the capacitor microphone in which a vibration plate 10 strained and fixed on a support ring 11 and a charge back-plate 20 supported on one end-side of a cylinder base 21 face each other and are disposed through a spacer forming a gap, the spacer 30A having at least three spacer pieces, in which the each spacer piece has the same thickness and is disposed apart from the adjacent spacer pieces at generally equal angle on the same circumference, in place of the ring-shaped spacer.

Abstract: The present invention provides a low noise phantom powered capacitor microphone and a method of using a vacuum tube as an impedance converter of the microphone capsule in the capacitor microphone with no exclusive power supply.

Abstract: A microphone in which a diaphragm which is vibrated by a sound wave received, and a conversion portion such as a magnetic circuit for electrically acting on the diaphragm to convert the vibration into an electric signal are incorporated into a unit case, wherein a first elastic body and a second elastic body are arranged on the upper surface and the lower surface, respectively, of an peripheral edge portion of the diaphragm, the diaphragm is mounted on the unit case through the first elastic body on the upper surface of the peripheral edge portion thereof, and one end side of the conversion portion is placed in contact with the second elastic body arranged on the lower surface of the peripheral edge portion of diaphragm to encase the conversion portion into the unit case.

Abstract: A microphone in which a diaphragm which is vibrated by a sound wave received, and a conversion portion such as a magnetic circuit for electrically acting on the diaphragm to convert the vibration into an electric signal are incorporated into a unit case, wherein a first elastic body and a second elastic body are arranged on the upper surface and the lower surface, respectively, of an peripheral edge portion of the diaphragm, the diaphragm is mounted on the unit case through the first elastic body on the upper surface of the peripheral edge portion thereof, and one end side of the conversion portion is placed in contact with the second elastic body arranged on the lower surface of the peripheral edge portion of diaphragm to encase the conversion portion into the unit case.