Abstract: An electromagnetic wave absorber (1a) includes: a first layer (10a) being a dielectric layer or a magnetic layer; and a conductive layer (20a) provided on at least one surface of the first layer (10a). The conductive layer (20a) has a sheet resistance of 100?/? or less after the electromagnetic wave absorber (1a) is exposed to an environment having a temperature of 85° C. and a relative humidity of 85% for 1000 hours. The electromagnetic wave absorber (1a) has a flexural rigidity of 7000 MPa·mm4 or less.

Abstract: An electromagnetic wave absorber (1a) includes: a first layer (10a) being a dielectric layer or a magnetic layer; and a conductive layer (20a) provided on at least one surface of the first layer (10a). The conductive layer (20a) has a sheet resistance of 100?/? or less after the electromagnetic wave absorber (1a) is exposed to an environment having a temperature of 85° C. and a relative humidity of 85% for 1000 hours. The electromagnetic wave absorber (1a) has a flexural rigidity of 7000 MPa·mm4 or less.

Abstract: The electric tool including a motor having a stator and a rotor, a rotation shaft integrally rotating with the rotor, a casing accommodating the motor, a ventilating window disposed in the casing, a cooling fan sucking an air through the ventilating window to cool off the motor, a magnetic body disposed to the rotation shaft, a magnetic detection unit detecting a rotational position of the magnetic body, and a circuit substrate on which the magnetic detection unit is mounted. The circuit substrate and the magnetic body are disposed to be isolated from a wind path of a cooling wind generated by rotation of the cooling fan.

Abstract: A rectifier circuit for rectifying an AC voltage supplied from a commercial power supply into a DC voltage, a smoothing capacitor for smoothing the output of the rectifier circuit, and an electrically powered tool for supplying the smoothed pulsating DC voltage to a motor by an inverter circuit, wherein when the motor is driven while no load is being applied to a tip tool, the smoothed DC voltage repeatedly generates a maximal value and a minimum value so as to synchronize with the fluctuation in the AC voltage. During no-load rotation, control is performed so that driving is performed at a value that is less than a threshold value D1 for the duty ratio at which the generation of a gear sound starts in any of the speed dial setting values 1-6. It is thereby possible to suppress a gear sound generated by a power transmission mechanism during no-load rotation.

Abstract: An electric tool is provided. The electric tool prevents anomalies in motor rotation due to dust and moisture sucked in together with a cooling wind, and is configured such that rotational position detection operations and switch operations are not affected. In the electric tool which drives a brushless DC motor using a controller, a magnetic body for rotational position detection is provided on a rotation shaft which can rotate integrally with a rotor, Hall ICs are provided to detect the rotational position of the magnetic body and output a position signal to the controller, and the magnetic body and the Hall ICs mounted on a substrate are arranged in a region isolated from the wind path of the cooling wind generated by rotation of a cooling fan. The Hall ICs are accommodated in a housing filled with resin.

Abstract: A resin film has through holes formed to extend through the thickness of the resin film. The through holes are pillar-shaped. An average density of the through holes is 1×106 to 1×1012 holes/cm2. An average diameter of the through holes is 1 to 310 nm. A degree of variability of the diameter of the through holes is 30% or less, the degree of variability of the diameter of the through holes obtained by dividing a standard deviation of the diameter of the through holes by the average diameter of the through holes and multiplying the resulting value by 100.

Abstract: A power tool is provided such that noise can be reduced at a wide range of rotation speeds. A speed setting dial to be operated by a worker is disposed on a rear end part of a housing of a grinder. A control part controls driving of a motor by setting the rotation speed of the motor in response to the value of a speed setting signal which indicates a value (voltage) corresponding to an amount of rotation of the speed setting dial by the worker. Although the control part basically causes the rotation speed of the motor to change continuously in response to the rotation amount of the speed setting dial, the control part sets the rotation speed of the motor while avoiding a predetermined rotation speed region in which the noise level is increased due to mechanical and acoustic resonances.

Abstract: Provided is an electric tool in which the risk of short-circuiting between conductive members of multiple installed switching elements has been reduced by providing partitioning plates between the switching elements. An electric tool, which has a motor, an inverter circuit with multiple switching elements for performing switching operations and controlling the driving of the motor, a control unit for controlling switching element on-off operations, and a circuit board on which the switching elements are loaded, is configured so that the circuit board is housed inside a container-shaped case (40) and the circuit board is secured with a partitioning member (50) that is interposed between the multiple switching elements and has partitioning plates (51, 52a, 52b) obtained from an insulating material.

Abstract: Provided is an easy-to-use electric tool with which braking force can be changed according to work conditions. When an operation switch 5 is turned off, a control unit 50 detects a rotation rate R1 of an electric motor 6. The control unit 50 stands by for a prescribed period, detects a rotation rate R2 of the electric motor 6, and calculates the difference between the rotation rates R1, R2 (R=R1?R2). Since the rotation rate difference R corresponds to the rate of change in rotation rate with time during deceleration of the electric motor 6 and is smaller the larger the moment of inertia of the attached rotary tool, the control unit 50 can determine the moment of inertia of the rotary tool on the basis of the rotation rate difference R. The control unit 50 sets the braking force according to the moment of inertia and performs braking.

Abstract: The dial structure includes a dial base having an optical transparency, on which a carbon pattern is formed, and an uneven portion formed on a front surface of the dial base. The uneven portion has a convex and concave form representing a convex and concave form of the carbon pattern. A background print layer is formed on a back surface of the dial base excluding a portion to be an indicator portion, and has a color tone of the carbon pattern.

Abstract: An electric tool is provided. This electric tool includes a controller which controls power supply to the motor in response to operation of a switch lever which turns rotation of the motor ON and OFF. The electric tool includes a magnetic body provided on a movable arm which is moved by means of a switch lever, and a first and second magnetic detection units (Hall ICs) provided adjacent to the range of motion of the magnetic body. The first magnetic detection unit detects the approach of the magnetic body when the switch lever is in the motor OFF position, and the second magnetic detection unit detects approaching of the magnetic body when the switch lever is in the ON position. The controller uses the two detection results to determine the switch lever position. The magnetic detection units are accommodated in a casing which is isolated from a cooling wind path.

Abstract: An electric tool is provided. The electric tool prevents anomalies in motor rotation due to dust and moisture sucked in together with a cooling wind, and is configured such that rotational position detection operations and switch operations are not affected. In the electric tool which drives a brushless DC motor using a controller, a magnetic body for rotational position detection is provided on a rotation shaft which can rotate integrally with a rotor, Hall ICs are provided to detect the rotational position of the magnetic body and output a position signal to the controller, and the magnetic body and the Hall ICs mounted on a substrate are arranged in a region isolated from the wind path of the cooling wind generated by rotation of a cooling fan. The Hall ICs are accommodated in a housing filled with resin.

Abstract: A grinder includes a spindle on which a grindstone wheel is mounted, and a wheel guard covering the grindstone wheel, the grinder including: an attachment portion having a housing portion and provided to a main body rotatably holding the spindle to surround the spindle; a fitting portion being provided to the wheel guard and fitting into the attachment portion; locking pieces disposed to the fitting portion at a different position in a circumferential direction of the spindle; cut-out portions disposed to the attachment portion at a different position in the circumferential direction and allowing the locking pieces to enter the housing portion; and an inner circumferential edge disposed to the attachment portion at a different position from the positions of the cut-out portions in the circumferential direction and being pressed against the locking pieces housed in the housing portion.

Abstract: A disc grinder comprises: a motor serving as a driving source; a housing in which the motor is housed; a centrifugal fan mounted on an output shaft of the motor, and configured to provide cooling air for cooling the motor; and a first flow-regulating member for guiding cooling air in a radially-outward direction of the output shaft, and a second flow-regulating member for guiding cooling air guided by the first flow-regulating member toward the front end of the housing.

Abstract: A grinder includes an attachment base provided on a main body, which is rotatably retaining a spindle, and surrounding the spindle; a mating portion provided on the wheel guard and mated with the attachment base; a recessed portion provided on the attachment base; a protruding portion provided on the mating portion; and a plate spring disposed between the attachment base and the mating portion, and when the wheel guard is displaced in the radial direction of the spindle against bias of the plate spring, mating between the recessed portion and the protruding portion is canceled, and the wheel guard is turnable in the circumferential direction of the spindle. As a result, the possibility that fixation of the wheel guard is cancelled against the intention of an operator is reduced as much as possible.

Abstract: For providing a power tool capable of significantly reducing the transmission of vibrations to the housing 40 held by a user, the inner cover 30 for covering an opening at a front end of the housing 40 is attached at the front end of the housing 40 of the grinder 10 and the gear cover 20 is attached with screws 36 on a front side of the inner cover 30. When the gear cover 20 is attached to the inner cover 30, the elastic member 70 is disposed in the recess shape 60 formed at the fixing part between the inner cover 30 and the gear cover 20 and the locking part of the housing 40 is fitted so as to be locked to the elastic member 70.

Abstract: The dial structure includes a dial base having an optical transparency, on which a carbon pattern is formed, an uneven portion formed on a front surface of the dial base, having a convex and concave form representing a convex and concave form of the carbon pattern, and a background print layer formed on a back surface of the dial base excluding a portion to be an indicator portion, having a color tone of the carbon pattern.

Abstract: A power tool includes a motor, a housing that accommodates the motor, a switch that supplies power to the motor, a switch lever that is provided movable relative to the housing to selectively turn ON and OFF the switch, and an off-lock member that is provided movable relative to the switch lever. The off-lock member includes a first engaging part and a second engaging part that are engageable with the housing.

Abstract: A power tool includes a motor, a housing that accommodates the motor, a switch that supplies power to the motor, a switch lever that is provided movable relative to the housing to selectively turn ON and OFF the switch, and an off-lock member that is provided movable relative to the switch lever. The off-lock member includes a first engaging part and a second engaging part that are engageable with the housing.

Abstract: The present invention is directed to an image processing device that can process a halftone dot image without producing moire therein.