Abstract: A boundary microphone includes a base, a microphone unit that is mounted onto the base and converts voice into electrical signals, and a pressure-sensitive switch of membrane type for an on/off operation of output signals from the microphone unit. The pressure-sensitive switch is physically isolated from the base, and is supported at the bottom thereof by a switch support comprising a hard material.

Abstract: Electro-acoustic converters each include a diaphragm, and a fixed electrode apart from the diaphragm for a certain distance and facing the diaphragm. The electro-acoustic converters are anteroposteriorly disposed on the same axis in a single casing, and are electrically connected in series. The front and rear converters each include impedance converters, and are serially connected with each other together with the impedance converters.

Abstract: A stereo capacitor microphone unit includes: two unidirectional microphone units integrally formed with respective fixed electrodes of the unidirectional microphone units facing each other; and an insulating spacer that is interposed between the fixed electrodes and provided with a gap formed at a portion of an outer periphery towards radial direction. The gap communicates fixed electrode rear spaces of the respective unidirectional microphone units with an external space to serve as a common rear acoustic terminal for the unidirectional microphone units.

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.

Abstract: Diaphragms of a plurality of capacitor microphone units are arranged in the same plane and the capacitor microphone units are connected in series to make an output from an impedance converter connected to one capacitor microphone unit drives a ground side of another capacitor microphone unit connected to the impedance converter.

Abstract: A base having a flat shape; a support provided on a bottom surface of the base; a microphone unit incorporated in the base and converts sound into an electric signal; and a pressure sensitive switch with which an output signal from the microphone unit is turned on and off are included. At least one such pressure sensitive switch is provided to be pressed between the base and the support.

Abstract: A recording apparatus including a stacker which is configured to be displaced between a first posture for stacking a recording medium in an inclined state that a first end part which is distant from a recording position in a transport direction is located above a second end part which is near thereto, and a second posture for forming a transporting path of a straight line along which the recording medium is able to be transported toward the recording position; a first support unit which supports the first end part of the stacker to be able to rotate; and a second support unit which moves the second end part of the stacker upward and downward while supporting the second end part of the stacker to rotate the stacker centering around the first end part when the stacker is displaced between the first posture and the second posture.

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: 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: A roller apparatus includes: a first roller provided in a curved medium transporting path and driven by a power source; and a second roller driven and rotating with a medium nipped between it and the first roller, wherein the second roller is located on a side in which, when the leading end of the medium enters between the rollers, the leading end of the medium comes into contact with the second roller due to the restoring force of the medium with a curved state as a result of the curved medium transporting path, and has on its outer circumferential surface a guide section for guiding the leading end of the medium between the rollers.

Abstract: A recording apparatus includes a transport roller that transports recording materials, a holding tray for setting a first recording material, which is configured to be advanced and retracted between a first position wherein the first recording material can be transported by the transport roller and a second position wherein the holding tray is retracted from the first position, and a path forming member for guiding a second recording material from above or below the second position to a position wherein the recording material can be transported by the transport roller, in which a front end portion of the holding tray being retracted to the second position protrudes to a position located between a guide path formed by the path forming member and the transport roller.

Abstract: A boundary microphone including a microphone case is provided whereby sufficient shielding performance can be achieved against strong electromagnetic waves of cellular phones. In the boundary microphone, a microphone case 1 includes a flat metallic base 10 opened on its top surface and a metallic microphone cover 20 mounted on the base 10 so as to cover the top surface of the base 10, the microphone cover 20 having a number of openings (sound wave introduction holes) thereon, the microphone case 1 housing a microphone unit 31, wherein a gasket 40 having elasticity and conductivity is disposed between the base 10 and an edge face 20a of the microphone cover 20.

Abstract: A boundary microphone, comprising: a base made of a metal; a cover made of a metal having a plurality of holes for introducing sound waves; and internal components including a microphone unit that is disposed in an internal space enclosed by the base and the cover; a first metallic part disposed on one side of the upper and lower sides of the internal components; and a second metallic part, which is disposed on other side of the upper and lower sides of the internal components and which encloses the internal components along with the first metallic part from all directions, are provided, wherein the base, the cover, the first metallic part, and the second metallic part are alternately overlapped at their peripheral portions, and wherein at least one of the first metallic part and the second metallic part is made of a metallic mesh.

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: A boundary microphone including a microphone case is provided whereby sufficient shielding performance can be achieved against strong electromagnetic waves of cellular phones. In the boundary microphone, a microphone case 1 includes a flat metallic base 10 opened on its top surface and a metallic microphone cover 20 mounted on the base 10 so as to cover the top surface of the base 10, the microphone cover 20 having a number of openings (sound wave introduction holes) thereon, the microphone case 1 housing a microphone unit 31, wherein a gasket 40 having elasticity and conductivity is disposed between the base 10 and an edge face 20a of the microphone cover 20.

Abstract: A spindle unit control method controls a plurality of spindle units which rotate in synchronism with each other, and comprises with respect to each of the spindle units a first step of obtaining a phase error by comparing phases of a detection signal indicating a rotary reference position of the spindle unit and a first clock signal, a second step of generating a second clock signal having a phase which is adjusted by delaying or advancing the phase of the first clock signal by the phase error, and a third step of controlling the rotation of the spindle unit by a phase locked loop based on the detection signal and the second clock signal. The first clock signal is used in common with respect to each of the spindle units, and the second clock signal is independent for each of the spindle units.

Abstract: An image forming apparatus for developing an electrostatic latent image formed on a photosensitive drum by a toner while rotating the photosensitive drum, transferring the toner image to a paper, and fixing the toner image on the paper. The photosensitive drum is rotated by a stepping motor, and an excitation circuit gradually increases an exciting current of a coil in each phase of the stepping motor to a predetermined value and thereafter gradually decreases. By this control of the exciting current, the stepping motor smoothly rotates without generating minute vibration, so that when the photosensitive drum is rotated by the stepping motor, there is no deleterious influence on an image. Use of the stepping motor enables a reduction in the size and the cost of the image forming apparatus.

Abstract: An impact printer which can detect halfway defects of printing coils such as partial short circuits is disclosed. The impact printer according to the present invention includes at least one printing coil for driving a printing element and driving transistor which controls the printing element by switching a current flowed through the printing coil, and further includes an inductance detection means for detecting whether or not said printing coil has an appropriate inductance.

Abstract: A shuttle printer having a print shuttle unit capable of reciprocating with a print head mounted thereon, and a balance shuttle unit capable of reciprocating to generate counterforce to momentum of the print shuttle unit. The shuttle printer includes a device for driving the print shuttle unit to reciprocate, and a device for driving the balance shuttle unit to reciprocate. The shuttle printer further includes a device for detecting the position of the print shuttle unit, and a device for synchronously controlling the two driving devices in response to a result of detection by the print shuttle unit position detecting device.