Abstract: A motor controller includes an inverter circuit, a speed detector, an amplifier, a voltage detector, and an offset voltage addition circuit. The inverter circuit drives a motor based on a PWM signal. The speed detector generates an actual speed signal corresponding to an actual speed of the motor. The amplifier outputs a differential voltage by amplifying a difference between the actual speed signal and a target speed signal. The voltage detector outputs a switch signal for switching rotation direction of the motor. The switch signal has a first level, when the differential voltage is equal to or greater than a predetermined value. The switch signal has a second level, when the differential voltage is less than the predetermined value. The offset voltage addition circuit adds an offset voltage to the differential voltage according to the signal level of the switch signal.

Abstract: A motor controller includes an inverter circuit, a speed detector, an amplifier, a voltage detector, and an offset voltage addition circuit. The inverter circuit drives a motor based on a PWM signal. The speed detector generates an actual speed signal corresponding to an actual speed of the motor. The amplifier outputs a differential voltage by amplifying a difference between the actual speed signal and a target speed signal. The voltage detector outputs a switch signal for switching rotation direction of the motor. The switch signal has a first level, when the differential voltage is equal to or greater than a predetermined value. The switch signal has a second level, when the differential voltage is less than the predetermined value. The offset voltage addition circuit adds an offset voltage to the differential voltage according to the signal level of the switch signal.

Abstract: There is provided an optical connector device which prevents leakage of light until right before connectors are connected to each other and is small-sized by a reduction in space for housing shutters. The optical connector device is an optical connector device comprising a first optical connector and a second optical connector. When shutters for shutting out light from the optical connectors are collided with each other, the shutters move to positions where they do not shut out the light. Therefore, the first optical connector and the second optical connector are connected to each other. After moving, the shutter of the first optical connector and the shutter of the second optical connector are inserted into the second optical connector while remaining contacting each other.

Abstract: The head end surface of an optical fiber (2) and the head end surface of an optical fiber (12) are butted to each other in an alignment member (22) of an adapter (21). In the butting, because one of the members clasping the optical fiber (2) is a plate (4a) that is short, the optical fiber (2) is bent and buckled between the left end of the short plate and the right end of the alignment member. Members clasping the optical fiber (12) are a long plate (14b) and a V-grooved base plate (13), and the optical fiber (12) is therefore horizontally fixed between each of right ends of the long plate and of the V-grooved base plate (13) and the left end of the alignment member. This results that the head end surface of the optical fiber (2) and the head end surface of the optical fiber (12) are in tight contact with each other, achieving excellent optical transmission between both optical fibers.

Abstract: There is provided an optical connector device which prevents leakage of light until right before connectors are connected to each other and is small-sized by a reduction in space for housing shutters. The optical connector device is an optical connector device comprising a first optical connector and a second optical connector. When shutters for shutting out light from the optical connectors are collided with each other, the shutters move to positions where they do not shut out the light. Therefore, the first optical connector and the second optical connector are connected to each other. After moving, the shutter of the first optical connector and the shutter of the second optical connector are inserted into the second optical connector while remaining contacting each other.

Abstract: The present invention provides an optical connector for coupling one optical fiber wire 18 with another optical fiber wire 18′ in physical contact. The optical connector comprises a receiving portion 21 including a support region 22 adapted to support the optical fiber wires 18, 18′ along the axis of said receiving portion. The axis 24 of the receiving portion is offset from the axis 25 of the optical fiber wire in a posture of being ready to be inserted into the receiving portion 21. When the optical fiber wire 18 is inserted into the receiving portion 21, the inserted optical fiber wire 18 is brought into contact with and bent by a guide region 23, and then the optical fiber wire is slidably moved along the support region 22 of the receiving portion 21. Finally, with keeping the optical fiber wire to be supported by the support region 22, the end of the optical fiber wire 18 is brought into physical contact with the end of another optical fiber wire 18′.

Abstract: An electrical load driving circuit is provided which includes an insulated gate transistor and a control voltage limiting circuit. The transistor works to supply the power to an electrical load selectively. The control voltage limiting circuit includes a control circuit and a switching circuit. The control circuit works to limit a voltage applied to the transistor selectively to one of a higher controlled voltage and a lower controlled voltage. The switching circuit is disposed across the transistor and closed selectively to limit the voltage applied to the transistor to the second controlled voltage through the control circuit when it is determined that an overcurrent has occurred which flows through the transistor.

Abstract: An electrical load driving circuit is provided which includes an insulated gate transistor and a control voltage limiting circuit. The transistor works to supply the power to an electrical load selectively. The control voltage limiting circuit includes a control circuit and a switching circuit. The control circuit works to limit a voltage applied to the transistor selectively to one of a higher controlled voltage and a lower controlled voltage. The switching circuit is disposed across the transistor and closed selectively to limit the voltage applied to the transistor to the second controlled voltage through the control circuit when it is determined that an overcurrent has occurred which flows through the transistor.

Abstract: A current control circuit controls a gate potential of a transistor to equalize a load current IL with a trapezoidal wave signal Sb. The trapezoidal wave signal Sb increases at a constant gradient when a drive command signal Sa turns into H level. Due to increase of load current IL, the transistor starts operating in a linear region and a gate voltage VGS abruptly increases. A saturation state detecting circuit turns a current saturation signal Sc into L level when the gate voltage VGS exceeds a reference voltage Vr. A trapezoidal wave generating circuit stops increase of trapezoidal wave signal Sb. When drive command signal Sa turns into L level, the trapezoidal wave signal Sb decreases at a constant gradient. The load current IL decreases according to reduction of trapezoidal wave signal Sb.

Abstract: A current control circuit controls a gate potential of a transistor to equalize a load current IL with a trapezoidal wave signal Sb. The trapezoidal wave signal Sb increases at a constant gradient when a drive command signal Sa turns into H level. Due to increase of load current IL, the transistor starts operating in a linear region and a gate voltage VGS abruptly increases. A saturation state detecting circuit turns a current saturation signal Sc into L level when the gate voltage VGS exceeds a reference voltage Vr. A trapezoidal wave generating circuit stops increase of trapezoidal wave signal Sb. When drive command signal Sa turns into L level, the trapezoidal wave signal Sb decreases at a constant gradient. The load current IL decreases according to reduction of trapezoidal wave signal Sb.

Abstract: The present invention provides an optical connector for coupling one optical fiber wire 18 with another optical fiber wire 18′ in physical contact. The optical connector comprises a receiving portion 21 including a support region 22 adapted to support the optical fiber wires 18, 18′ along the axis of said receiving portion. The axis 24 of the receiving portion is offset from the axis 25 of the optical fiber wire in a posture of being ready to be inserted into the receiving portion 21. When the optical fiber wire 18 is inserted into the receiving portion 21, the inserted optical fiber wire 18 is brought into contact with and bent by a guide region 23, and then the optical fiber wire is sidably moved along the support region 22 of the receiving portion 21. Finally, with keeping the optical fiber wire to be supported by the support region 22, the end of the optical fiber wire 18 is brought into physical contact with the end of another optical fiber wire 18′.

Abstract: An optical connector comprises a housing having a ferrule holding portion for holding a ferrule to be connected to an optical fiber, wherein said ferrule is equipped with a split sleeve for implementing an alignment with a ferrule of a mate connector, and said ferrule holding portion has a ferrule holding through passage which allows said ferrule to be received along the direction of ferrule diameter, allows said split sleeve to be inserted along the axial direction of said sleeve, and allows said ferrule to be installed into and held to said housing.

Abstract: An optical semiconductor module structure comprises a housing which has an optical coupling means comprising an optical semiconductor element and a ferrule accommodating an optical fiber therein, a portion of said housing for holding said ferrule being formed to be a protuberant portion, wherein said optical semiconductor module structure is provided with, for coupling an optical connector with said protuberant portion, a means for regulating said optical connector in the direction of the axis of said ferrule and a means for regulating said optical connector in a direction right to the axis of said ferrule.