Abstract:
A heatsink to be mounted on a circuit board including a plurality of electronic parts is constituted of a conductive and rectangular plate-shaped member, and mounted on the circuit board such that a main surface of the heatsink blocks an airflow generated on the circuit board, the heatsink being electrically grounded. The main surface includes a contacting portion disposed in contact with the circuit board and an isolated portion separated from the circuit board, the isolated portion being cut into two parts along a straight line extending in a direction away from the circuit board. The two parts are each bent such that an end portion on a side of the straight line is oriented to a downstream side of the airflow, so that an opening is defined between the respective end portions of the two parts on the side of the straight line.
Abstract:
A motor driving unit controls motor conducted current of a brushed DC motor on the basis of a motor control signal. A motor control unit provides the motor control signal to the motor driving unit and thereby controls the brushed DC motor. A brush noise detecting unit detects brush noises in conducted current of the brushed DC motor and outputs a brush noise detection signal. A speed determining unit determines a time interval of the brush noises and determines a rotation speed of the brushed DC motor on the basis of the time interval. Further, the motor control unit determines whether the brushed DC motor is in a lock status or not on the basis of the rotation speed in a period that the motor control signal is provided to the motor driving unit to cause the brushed DC motor to be in operation.
Abstract:
A motor driving unit controls motor conducted current of a brushed DC motor on the basis of a motor control signal. A motor control unit provides the motor control signal to the motor driving unit and thereby controls the brushed DC motor. A brush noise detecting unit detects brush noises in conducted current of the brushed DC motor and outputs a brush noise detection signal. A speed determining unit determines a time interval of the brush noises and determines a rotation speed of the brushed DC motor on the basis of the time interval. Further, the motor control unit determines whether the brushed DC motor is in a lock status or not on the basis of the rotation speed in a period that the motor control signal is provided to the motor driving unit to cause the brushed DC motor to be in operation.
Abstract:
A liquid ejection device includes an ejection portion, an accommodating portion, a lowering processing portion, and a circulation processing portion. The ejection portion has a first accommodation space configured to accommodate a liquid and eject the liquid from an ejection port communicating with the first accommodation space. The accommodating portion has a second accommodation space below the ejection port and configured to accommodate the liquid to be supplied to the ejection portion, in the accommodating portion, a space above a water level of the liquid accommodated in the second accommodation space communicates with the atmosphere. The lowering processing portion lowers the water level of the liquid accommodated in the accommodating portion with respect to the ejection port. The circulation processing portion circulates the liquid along a circulation path passing through the ejection portion after the water level of the liquid is lowered by the lowering processing portion.
Abstract:
An image forming apparatus includes an equal-magnification-region-designation accepting circuit, a front-surface-image generating circuit, a back-surface-image generating circuit, and a duplex printing circuit. The front-surface-image generating circuit reduces the image in accordance with the reduction magnification to generate image data representing the reduced image as image data representing a front-surface-side image of duplex printing. The back-surface-image generating circuit uses the designated equal-magnification region in the image before the reduction by a magnification equal to the magnification of the image to generate image data representing a back-surface-side image of duplex printing. The duplex printing circuit prints an image corresponding to the front-surface-side image data on a front surface of a predetermined paper sheet and an image corresponding to the back-surface-side image data on the back surface of the paper sheet.