摘要:
A multilayer printed circuit board, including: a signal interconnection which transmits and receives an electrical signal between electronic components; a ground interconnection connected to a ground of a circuit; a power interconnection connected to a power layer to supply power to electronic components; at least one ground layer installed in an inner layer; at least one clearance which passes through the ground layer; and a ground via which connects the ground interconnection with the ground layer. The signal interconnection and the ground interconnection or the signal interconnection and the power interconnection are installed in a pair, and a pair of interconnection vias for interlayer connection are inserted through the clearance installed in the ground layer so that one of the pair of interconnection vias is connected to the ground layer by the ground interconnection.
摘要:
A multilayer printed circuit board, including: a signal interconnection which transmits and receives an electrical signal between electronic components; a ground interconnection connected to a ground of a circuit; a power interconnection connected to a power layer to supply power to electronic components; at least one ground layer installed in an inner layer; at least one clearance which passes through the ground layer; and a ground via which connects the ground interconnection with the ground layer. The signal interconnection and the ground interconnection or the signal interconnection and the power interconnection are installed in a pair, and a pair of interconnection vias for interlayer connection are inserted through the clearance installed in the ground layer so that one of the pair of interconnection vias is connected to the ground layer by the ground interconnection.
摘要:
In the portable electronic device of the present invention, charging electrodes exposed to the exterior of a casing are electrically connected to a pair of charging terminals mounted upright on the printed circuit board, and a charging terminal (negative electrode, or ground) that is one of the pair of charging terminals is connected to the ground of the printed circuit board. A high-frequency current suppression part is mounted in a series connection on the charging terminal (negative electrode, or ground). The high-frequency current suppression part is a ferrite core, ferrite beads, or another low resistance part. In such a configuration, a secondary electric discharge occurs via the externally exposed charging electrodes and the like when electrostatic discharge noise is applied from the exterior of the portable electronic device and when the ground current of the printed circuit board oscillates due to the discharge electric current that flows at this time, whereby circuit malfunctions are prevented.
摘要:
A vibration drill unit capable of obtaining an intensive drilling force. The vibration drill unit includes a first ratchet, anon-rotatable second ratchet having a claw engageable with the claw of the first ratchet, and a main body frame for accommodating a motor, a spindle, the first ratchet and the second ratchet. The respective claws of the first ratchet and the second ratchet include the first inclined surfaces formed so as to be engaged in the rotation direction by rotations of the first ratchet and so as to be separated from each other, the second inclined surfaces having greater inclination in the reversed direction than the first inclined surfaces, top parts that link the upper parts of both inclined surfaces to each other, and flat parts that link the bottom parts of both inclined surfaces to each other.
摘要:
A plurality of cylindrical-shaped or spherical-shaped magnets each including the N-pole and the S-pole formed at a predetermined angle interval are rotatably placed between upper case and lower case, and a plurality of magnetic detection elements are disposed opposite to the magnets at a predetermined gap. When a plurality of small magnets having a diameter of about 2 to 3 mm are rotated by the finger, from the rotation direction and the rotation angle of the magnets the operation direction and the operation amount of the finger can be detected. Therefore, it is possible to obtain an input device capable of making an entire input device with a low dimension so as to make the device thin, and capable of reliable operation.
摘要:
The present invention has an object of providing a technology capable of stopping and starting an internal combustion engine more preferably by restraining vibrations when the internal combustion engine stops and a scatter in crank angle when the internal combustion engine stops. For a period till an actual stop of the internal combustion engine since a stopping condition of the internal combustion engine was established, an air quantity of air flowing into a cylinder of the internal combustion engine is decreased when a number of revolutions of the engine is higher than a specified number of revolutions (S102) and is increased when the number of revolutions of the engine is equal to or lower than the specified number of revolutions (S106).
摘要:
In a cluster type NAS, it is necessary to copy file data between disk devices of servers upon migration of a file system or a part of the file system. A server includes a control table for managing a file system or a part of the file system, and a mapping table for managing a relation between a logical device of a disk subsystem and a logical unit recognized by a server, and in response to an instruction to execute migration of the file system from a first server to a second server, the mapping table is referenced to send an instruction to update the relation between the logical device and the logical unit to the second server, and the second server newly recognizes a logical unit and updates a management server identifier of the control table.
摘要:
An impact drill minimizing transmission of vibration to a handle gripped by a user's hand. A spindle extends through a main frame and is movable in its axial direction and rotatable about its axis. A first ratchet is rotatable and axially movable together with the spindle. A second ratchet is axially movable but unrotatable. In an impact drilling mode, the first ratchet is brought into abutment with the second ratchet so that the spindle is reciprocally moved in the axial direction.
摘要:
A stop control apparatus for an internal combustion engine is provided with a valve mechanism capable of operating at least one of an intake valve and an exhaust valve independently a crankshaft of an internal combustion engine, and a valve controlling device for controlling an operation of the valve mechanism so that the internal combustion engine is stopped in a predetermined state.
摘要:
A valve-driving system, which is applied to an internal combustion engine having a plurality of cylinders, for driving an intake or exhaust valve provided in each cylinder, comprising: a plurality of valve-driving apparatuses, each of which is provided for at least each one of the intake valve and the exhaust valve, each valve-driving apparatus having an electrical motor as a driving source for generating rotation motion and a power transmission mechanism provided with a transmitting section for transmitting the rotation motion generated by the electrical motor and a converting section for converting the rotation motion transmitted from the transmitting section into opening and closing motion of the valve to be driven; and a motor control device which controls operations of electric motors of the respective valve-driving apparatuses in accordance with the operation state of the internal combustion engine.