Abstract: A battery compartment for a condenser microphone includes a battery space configured to hold a battery; a battery outlet open to a portion of a peripheral wall of the battery space and allowing removal of the battery in the battery space; a lid covering the battery outlet; and a ribbon having one end portion fixed to an internal wall of the battery space and the other end portion disposed to be pulled out from the battery outlet and wrapping around an external periphery of the battery. The ribbon is conductive and the fixed end portion is grounded.

Abstract: To suppress the transverse displacement of a ribbon due to an impact to a level smaller than that achieved by electromagnetic damping. The switch 150 breaks a path between the piezoelectric element 140 and the secondary winding 132 so as to be non-conductive when a power plug is connected (the microphone is in use), and completes a path between the piezoelectric element 140 and the secondary winding 132 so as to be conductive when a power plug is not connected (the microphone is not in use), in order to generate a driving force in the direction opposite to the displacement direction of the ribbon 10 by causing a current corresponding to power generated in the piezoelectric element 140 to flow in the ribbon 10.

Abstract: There is provided a narrow directional condenser microphone having an acoustic tube, in which a condenser microphone unit having a large effective diaphragm area is arranged on the rear end portion side of the acoustic tube to achieve high sensitivity without an increase in the diameter of the acoustic tube. In a narrow directional condenser microphone in which a unidirectional condenser microphone unit configured by arranging a diaphragm and a backplate opposedly via a spacer is arranged on the rear end side of an acoustic tube 10, the narrow directional condenser microphone is provided with a unit pair assembly 20 configured by opposedly combining two of the condenser microphone units 20R and 20L with the diaphragm side thereof being parallel to each other, and the unit pair assembly 20 is arranged on the rear end side of the acoustic tube 10 in such a manner that the condenser microphone units 20R and 20L are arranged symmetrically with respect to the tube axis X of the acoustic tube 10.

Abstract: The earphone includes a driver unit; a housing accommodating the driver unit, the housing having a front face serving as a sound emitting surface and a bowl shaped rear face; a hollow casing provided separately from the housing, the casing being configured to increase an internal volume adjacent to the rear side of a vibrating plate and to reduce the back pressure of the vibrating plate; and a connecting channel connecting the rear face of the housing and the casing such that the housing is in communication with the internal space of the casing, in which the housing includes a sound emitting tube protruding from the front face thereof so as to be fitted into an external auditory meatus.

Abstract: A first diaphragm FD and a second diaphragm RD are respectively arranged across a fixed electrode BP at both sides to constitute the variable directivity condenser microphone. A microphone body 1 includes a vacuum tube Q1 for impedance converting an audio signal obtained at the fixed electrode, and a connector 2 provided with a hot side connector terminal and a cold side connector terminal through which the audio signal that is impedance converted by the vacuum tube is outputted in parallel. A means for supplying a polarization voltage applied to the second diaphragm RD from an external power supply circuit 3 is arranged such that the hot side connector terminal and the cold side connector terminal are used as a forward conductor and a ground connector terminal for the microphone body arranged at the connector is used as a return conductor.

Abstract: A dynamic microphone unit has a diaphragm 5 vibrating in response to sound waves, a voice coil 6 fixed to the diaphragm 5 and vibrating in cooperation with the diaphragm 5, a magnetic circuit including a magnetic gap around the voice coil 6 and generating a magnetic field in a magnetic gap, a first air chamber 11 adjacent to the reverse of the diaphragm 5 holding an acoustic resistance therein, a second air chamber 9 behind the voice coil, and a communication passage 22 for sound waves between the first air chamber 11 and the second air chamber 9.

Abstract: A boundary microphone includes: a base made of metal; a cover that is made of metal and has a plurality of holes through which a sound wave is guided; a microphone unit that converts sound into an electric signal; and a microphone unit holder slidably provided on the base and holds the microphone unit. The microphone unit holder has a knob. The base has a hole through which the knob of the microphone unit holder penetrates the base. The knob of the microphone unit holder and the hole of the base are so provided that the microphone unit holder can be moved with the microphone unit by a movement of the knob within a range defined by the hole.

Abstract: A pickup cable for a stringed instrument can switch between the output of the direct vibrational sound of strings and the output of the sound from the stringed instrument body generated by the vibrations of the strings and can also simultaneously output both the sound components. The pickup cable for a stringed instrument includes an input terminal to be inserted in a jack of the stringed instrument; a microphone to collect and convert sound of an internal space of the stringed instrument into collected-sound electrical signals; and an output terminal to output the collected-sound electrical signals. The microphone is incorporated in the input terminal.

Abstract: This invention provides a condenser microphone unit having a diaphragm assembly in which a diaphragm does not attach to a fixed electrode even if a polarization voltage is increased. A condenser microphone unit is provided having a diaphragm assembly 1 in which a diaphragm 12 is stretched over a diaphragm support 10 and a fixed electrode 20 arranged to face the diaphragm assembly 1 through a spacer. An opening 10a over which the diaphragm 12 is stretched so as to be able to vibrate is formed in the diaphragm support 10, the diaphragm 12 is stretched over the diaphragm support 10 in a situation where a central part of the diaphragm is dented to be concave, and the concave is arranged to face the fixed electrode 20.

Abstract: A unidirectional microphone is provided that has an excellent directional frequency response and a high sensitivity. Sound waves are guided to a rear acoustic terminal 10b of an acoustic resistance tube 30 through an acoustic resistance member 31. A rear end opening 30b of the acoustic resistance tube 30 is blocked so as to prevent the sound waves from entering the rear acoustic terminal 10b from the rear end opening 30b of the acoustic resistance tube 30 on the side of the rear acoustic terminal 10b. A gap G which allows low-frequency sound waves to pass and through which a front acoustic chamber A1 and a rear acoustic chamber A2 in the acoustic resistance tube 30 communicate with each other is provided between the inner peripheral surface of the acoustic resistance tube 30 and the outer peripheral surface of the microphone unit 10.

Abstract: To provide electromagnetic damping without a special output connector for protecting a diaphragm of metallic ribbon foil of a ribbon microphone against shocks. A ribbon microphone operable with a phantom power supply comprises: an acoustic-electric converter 1 including a pair of permanent magnets and a diaphragm of metallic ribbon foil; and a step-up transformer 110 coupled with the diaphragm on a primary winding 111 side and having, on a secondary winding 112 side, an output connector 120 removably connected to a phantom power supply, the step-up transformer 110 increasing a voltage generated by the diaphragm to a predetermined voltage, the voltage then being output to the phantom power supply side through the output connector 120, wherein a switch 141 is connected across the secondary winding 112, the switch 141 being normally closed and being opened by a power supplied from the phantom power supply.

Abstract: Provided is a food molding apparatus which performs all steps from forming to conveyance and storage in one housing and which is small in size and inexpensive. A conveyance section 500 which holds a formed cooked rice product (a rice ball 10) by use of holding arms 510 is provided, within a housing, with an X-axis moving unit 570 which moves the formed cooked rice product in an X-axis direction and a Z-axis moving unit 550 which moves the formed cooked rice product in a Z-axis direction. A storage section 600 provided with a tray 610 on which the rice ball 10 is to be placed is further provided, within the housing, a Y-axis moving unit 630 which moves the tray 610 in a Y-axis direction, whereby the rice balls 10 are spread over on the tray 610.

Abstract: A cooked rice molding method includes a first supplying step of spreading cooked rice in a plate form on rolling-up plates deployed horizontally, a second supplying step of placing a dried laver sheet and ingredients on the cooked rice, a first pressing step of folding a first rotating plate and a second rotating plate disposed on two sides of a base plate in a direction to erect at approximate right angles with respect to the base plate, and a second pressing step of folding the third rotating plate rotatably attached to the first rotating plate at a side opposite to the base plate, to a base plate side. Then, the method includes a repositioning step of deploying the rolling-up plates in the horizontal state, and rotating the cooked rice about 90 degrees on the rolling-up bamboo plate. Finally, the first pressing step is repeated again.

Abstract: In a diaphragm of an electric sound converter which converts vibration such as sound into an electrical signal, a center dome is reinforced while suppressing variations in the sensitivity and frequency response to the minimum, whereby reduction in a high-pass reproduction limit is suppressed, and occurrence of anomalous resonance is prevented. In a diaphragm 1 of an electric sound converter having a center dome 2, a reinforcing film 7 made of the same material as that of the center dome and formed into the same shape as that of the center dome is applied to the center dome with a hot-melt adhesive 6 of the same nature as that of the center dome, a groove 7a formed in a polygonal reticulate pattern is provided on one surface of the reinforcing film adhered with the adhesive, and a convex rib 8 corresponding to the groove is formed on the other surface.

Abstract: An inclination detector includes: a casing; a light source installed in the casing; a reflector being suspended with a suspender to be at a certain position in the casing and reflecting a light beam from the light source to a direction different from a light axis direction; and a detector that outputs a signal corresponding to a projected position of the light beam, and an inclination of the casing is detected based on the projected position of the light beam reflected by the reflector.

Abstract: A condenser microphone unit includes a diaphragm, a diaphragm ring, a fixed electrode, a casing unit accommodating the diaphragm ring, the diaphragm, and the fixed electrode. A condenser microphone includes the condenser microphone unit. The diaphragm ring is indirectly fixed to the interior of the unit casing through a fixing ring fixed to the unit casing. The fixing ring has a planar ring portion and a plurality of projections projecting from the internal periphery of the ring portion and provided in a circumferential direction. The plurality of projections urges the diaphragm ring toward the fixed electrode.

Abstract: A dynamic microphone unit includes a diaphragm vibrating in response to received sound waves; a voice coil fixed to the diaphragm; a magnetic circuit generating magnetism in a magnetic gap where the voice coil is disposed; and an acoustic resistor disposed in a space adjacent to the reverse of the diaphragm. The acoustic resistor includes a cover disposed between a felt and the diaphragm. A case having an open end and a closed end accommodates the felt and the cover. The cover has holes transmitting sound waves at the closed end and a bending portion at the open end which urges the cover and the felt.

Abstract: A condenser microphone has an output circuit comprising an emitter-follower circuit; an impedance converter comprising an FET and at least one transistor of the emitter-follower circuit provided next to the FET; and the transistor having an emitter terminal provided with a constant-voltage circuit. The FET included in the impedance converter is operated by a voltage supplied from the constant-voltage circuit.

Abstract: A condenser microphone includes a volume restrictor disposed in a space inside a microphone case and an electronic circuit disposed in the space and encompassed by the volume restrictor. The volume restrictor reduces the volume of the space and prevents sound waves entering the space through openings on the microphone case from reaching the electronic circuit.

Abstract: A capacitor microphone includes: a capacitor microphone unit; a microphone casing that incorporates the microphone unit and is provided with an opening communicating with a rear acoustic terminal of the microphone unit; and a shield plate that covers the opening in the microphone casing from inside of the microphone casing. The shield plate has a projection extending towards axial direction of the microphone casing at least on microphone unit side in the axial direction of the microphone casing. The projection is folded to be pressed firmly against the outer surface of a casing of the capacitor microphone unit. The shield plate is rolled into a cylindrical shape and is in contact with the inner surface of the microphone casing with pressure.