30results about How to "Prevent noise leakage" patented technology

A vehicle steering system includes a sound absorbing material made of sponge and attached to an elastic joint which connects a second steering shaft extending from a steering wheel and a third steering shaft extending from a steering gear box to each other. The sound absorbing material faces an opening in a joint cover which is mounted on a dashboard and through which the second steering shaft passes. Therefore, the sound absorbing material absorbs noise which is produced in the steering gear box such that the noise does not pass from the engine room side through the opening in the joint cover to the vehicle compartment side, thereby preventing transmission of the noise to the vehicle compartment side. Further, the sound absorbing material requires only a simple shape and construction, thereby reducing the cost. Furthermore, the sound absorbing material does not come into sliding contact with the second steering shaft, and thus does not produce sliding noise or sliding resistance.

Provided is a connector for connection to a module board including an eject mechanism selectively ejecting a module from a module accommodating section. The eject mechanism includes a locking member that has a locking nib engageable with a recess of a case of the module. The locking member is rotatably supported by a sidewall section of a guide rail member, and thus can stay in an opening of the sidewall section. An eject button of the connector for connection to a module board has an operation section provided with a flange. The flange is pressed against the inner peripheral surface of a housing of an electronic device by a biasing force of coil springs all the time except for when the operation section is pushed in.

A circuit board (100) includes power supply planes (141, 143) arranged with gaps (147) in a D layer (140), connection members (182, 183, 184) electrically connecting at least one of the power supply planes (141, 143) to an electronic device (181), plural conductor elements (121) repeatedly arranged to surround at least some of the gaps (147) and the connection members (182, 183, 184), and ground planes (111, 171) being located in an A layer (110) or a G layer (170) and extending in a second region or a third region including a region opposing the first region and a region opposing the conductor elements (121).

A carpet for use in vehicles includes an upper surface layer 2, a nonwoven fabric sound absorption layer 3 and an adhesive resin layer 4 integrally securing the upper surface layer and the sound absorption layer. The adhesive resin layer is an air permeable resin layer formed by extruding melted thermoplastic into filament-like resin pieces by an extruder, and a thickness direction air permeability of the carpet falls within the range of 1 to 50 cm³/cm²·second. This carpet can secure excellent silence.

An upper surface layer 2 and a nonwoven fabric sound absorption layer 3 are integrally secured via an air permeable adhesive resin layer 4 formed by melting thermoplastic resin powder, and the air permeability of the thickness direction of the entire carpet 1 falls within the range of 1 to 50 cm³/cm²·second. This effectively absorbs noise from the upper side entering via a roof, doors and windows as well as noise from the lower side. The carpet can be manufactured by scattering thermoplastic resin powder on an upper surface member, heating the thermoplastic resin powder into melted thermoplastic resin, placing a nonwoven fabric on the upper surface member via the melted thermoplastic resin, and pressing the nonwoven fabric and the upper surface member in a laminated state. It is preferable that powder of particle size of 90 to 10,000 μm is scattered in the amount of 5 to 500 g/m².

A first semiconductor chip (200) is mounted on a second semiconductor chip (100). The first semiconductor chip (200) has a first conductor pattern (222). The second semiconductor chip (100) has a second conductor pattern (122). The second conductor pattern (122) is formed at a region overlapping the first conductor pattern (222) in a plan view. At least one element selected from a group consisting of the first conductor pattern (222) and the second conductor pattern (122) has a repetitive structure.

The invention discloses a network switch cover. The network switch cover comprises a framework, a casing covering the framework, and a sound abatement side board and an end face door which are oppositely arranged on the framework, wherein the framework, the casing, the sound abatement side board and the end face door form an enclosed space, the network switch is arranged in the enclosed space, the top face of the framework is provided with a top sound abatement channel, the bottom face is provided with a bottom sound abatement channel, one end of the top sound abatement channel is provided with a top air flow outlet communicated with an outer portion of the enclosed space, the other end is provided with a top air flow inlet communicated with an inner portion of the enclosed space, the top air flow inlet is equipped with an air pumping part used for pumping the air flow into the top sound abatement channel, one end of the bottom sound abatement channel is provided with a bottom air flow inlet communicated with the outer portion of the enclosed space, and the other end is provided with a bottom air flow outlet communicated with the inner portion of the enclosed space. The network switch cover is advantaged in that the network switch cover realizes noise reduction, realizes good heat radiation, has a simple structure, is convenient to process and has wide application occasions.

A resilient shielding member for a device (10) is disposed in a facing space (300) between a conductive motor case (10) of a motor (100) and an inverter case (201) of an inverter device (200). The resilient shielding member surrounds first terminal fittings (102) and second terminal fittings (202) connecting the motor (100) and the inverter device (200) over the entire circumference and is formed by integrating a waterproofing component (11) configured to resiliently contact the motor case (101) and the inverter case (201) in a liquid-tight manner over the entire circumference and a shielding component (13) configured to conductively contact the motor case (101) and the inverter case (201).

It is an object of the invention to provide a digital broadcast receiving unit capable of restraining the influence of a noise generated in a digital signal processing circuit to be exerted upon a turner unit, and of arranging a digital signal processing circuit board close to the tuner unit while restraining the influence exerted upon a peripheral circuit thereof and so forth even if the tuner unit is laid out on any location of a main circuit board. Both the tuner unit and the digital signal processing circuit board substantially stand upright on the main circuit board, respectively. The digital signal processing circuit board is disposed close to the tuner unit along the longitudinal direction thereof, and the digital signal processing circuit board has a mounting face on which electronic components such as ICs and so forth are mounted at a side facing tuner unit. Ground patterns are formed on the digital signal processing circuit board at a side opposite to the tuner unit and is rendered in an exposed state having no sealed case.

The invention provides an air cylinder, a slip sheet spring fixing structure and a rotary compressor. The air cylinder is provided with a slip sheet groove which is formed in the wall of the air cylinder in the radial direction. The radial outer side of the slip sheet groove is provided with a spring hole communicating with the slip sheet groove. The tail end of the spring hole is a sealed end formed by the wall of the air cylinder. A spring installation guiding opening communicating with the spring hole is formed in the spring hole along at least one of the two air cylinder side walls in the axial direction of the air cylinder. By arranging the tail end of the spring hole to be the sealed end composed of the wall of the air cylinder, the situation that a slip sheet spring is ejected out of the spring hole by a slip sheet during working is prevented, and the work reliability of the compressor is ensured; and meanwhile, the situation that noise in a compressor pump body is transmitted to a shell body and the outside through the spring, namely, noise outleakage occurs, is avoided. Moreover, according to the air cylinder, the slip sheet spring fixing structure and the rotary compressor, the structure is simple, and the manufacturing cost is low.