Abstract: In an arm for a construction machine formed as a box-shaped structural body by left and right side plates, an upper plate, a lower plate, and a rear plate, a left rear thick side plate constituting the left side plate, a right rear thick side plate constituting the right side plate, a rear thick upper plate constituting the upper plate, and a rear thick lower plate constituting the lower plate are formed by using a soft steel material having a large plate thickness. A left front thin side plate constituting the left side plate, a right front thin side plate constituting the right side plate, a front thin upper plate constituting the upper plate, and a front thin lower plate constituting the lower plate are formed by using a high tensile steel material having a small plate thickness. As a result, the weight of the entire arm can be reduced.

Abstract: In an arm for a construction machine formed as a box-shaped structural body by left and right side plates, an upper plate, a lower plate, and a rear plate, a left rear thick side plate constituting the left side plate, a right rear thick side plate constituting the right side plate, a rear thick upper plate constituting the upper plate, and a rear thick lower plate constituting the lower plate are formed by using a soft steel material having a large plate thickness. A left front thin side plate constituting the left side plate, a right front thin side plate constituting the right side plate, a front thin upper plate constituting the upper plate, and a front thin lower plate constituting the lower plate are formed by using a high tensile steel material having a small plate thickness. As a result, the weight of the entire arm can be reduced.

Abstract: An electronic circuit device 1 arranged with a first substrate 11, a core 33 (magnetic body) mounted on the first substrate 11, a resin sealing body 17 which covers the first substrate 11 and the core 33, and a curable type stress relieving material 35 which reduces stress applied to the core 33 by the resin sealing body 17 is arranged within the resin sealing body 33 from the side surface periphery of the core 33 across to the first substrate 11.

Abstract: The invention provides a load sensor which is driven by a low electric power consumption, can measure at a high precision, and has a high reliability without being broken. The load sensor is structured such that a detection rod for detecting a strain is provided in an inner portion of a hole formed near a center of a pin via a shock relaxation material and a semiconductor strain sensor is provided in the detection rod, in a load sensor detecting a load applied to the pin from a strain generated in an inner portion of the pin.

Abstract: An electronic circuit device 1 arranged with a first substrate 11, a core 33 (magnetic body) mounted on the first substrate 11, a resin sealing body 17 which covers the first substrate 11 and the core 33, and a curable type stress relieving material 35 which reduces stress applied to the core 33 by the resin sealing body 17 is arranged within the resin sealing body 33 from the side surface periphery of the core 33 across to the first substrate 11.

Abstract: The invention provides a load sensor which is driven by a low electric power consumption, can measure at a high precision, and has a high reliability without being broken. The load sensor is structured such that a detection rod for detecting a strain is provided in an inner portion of a hole formed near a center of a pin via a shock relaxation material and a semiconductor strain sensor is provided in the detection rod, in a load sensor detecting a load applied to the pin from a strain generated in an inner portion of the pin.

Abstract: Set with respect to the piezo-electric element (1) is an approximate expression representing a relationship between the amplitude (.DELTA.V) of the applied voltage range, a reference voltage (Vo) relative to the applied voltage range and an amount of displacement (G) of the piezo-electric element per unit voltage. There is obtained the amplitude (.DELTA.V) of the applied voltage range for producing the target amount of displacement in the reference voltage by inputting the target amount of displacement (.DELTA.X) and the reference voltage (Vo) and using the approximate expression. The applied voltage range (Vmin.about.Vmax) for producing the target amount of displacement is determined from the obtained amplitude of the applied voltage range and the inputted reference voltage (Vo). The voltage is applied to the piezo-electric element on the basis of the applied voltage range determined. It is therefore possible to cause highly accurate displacements without using a special displacement measuring device.

Abstract: A multi-axis load sensor is composed of at least one of a parallel plate structure connecting two members to each other by means of a plurality of flexible beams arranged in parallel to one another and a radial plate structure connecting the two members to each other by means of a plurality of flexible beams arranged radially relative to a given point and equipped with detection means for detecting deformations of the associated flexible beams. The deformations are of the bending deformation mode and are developed by a load applied to the associated flexible beams. At least one of the associated flexible beams is provided with another detection means for detecting deformations of a deformation mode different from the bending mode. The multi-axis load sensor is simple in structure and easily machined.