摘要:
A rubber member optically connects (a) an optical transmission medium or an optical component and (b) another optical transmission medium or another optical component by intervening between the (a) and the (b). An adhesive connecting member comprises a rubber member having a refractive index of 1.35 to 1.55 and an adhesive having a refractive index of 1.35 to 1.55.
摘要:
A rubber member optically connects (a) an optical transmission medium or an optical component and (b) another optical transmission medium or another optical component by intervening between the (a) and the (b). An adhesive connecting member comprises a rubber member having a refractive index of 1.35 to 1.55 and an adhesive having a refractive index of 1.35 to 1.55.
摘要:
An adhering jig for an adhesive connecting member is provided, in which the adhesive connecting member can be adhered without being broken even if it is twisted during connection of an optical fiber. The adhesive connecting member of the present invention has a tabular member having insertion holes fitting a shape of the optical connector, and an adhesive connecting member having a certain size. The adhesive connecting member has a strongly adhesive layer and non-adhesive layer, and the adhesive connecting member was arranged at a bottom of the insertion hole via the weakly adhesive layer, so that the non-adhesive layer is lower.
摘要:
An adhering jig for an adhesive connecting member is provided, in which the adhesive connecting member can be adhered without being broken even if it is twisted during connection of an optical fiber. The adhesive connecting member of the present invention has a tabular member having insertion holes fitting a shape of the optical connector, and an adhesive connecting member having a certain size. The adhesive connecting member has a strongly adhesive layer and non-adhesive layer, and the adhesive connecting member was arranged at a bottom of the insertion hole via the weakly adhesive layer, so that the non-adhesive layer is lower.
摘要:
A motor driver drives a motor composed of a rotor and plural-phase windings that generate a magnetic field for rotating the rotor, including: a plurality of transistors that operate as switches for supplying current to the windings; a position detector operable to detect a rotational position of the rotor, based on a terminal voltage of each winding; and a switching controller operable to have performed a switching method to turn the transistors to an ON state or to an OFF state for controlling the rotor at the predetermined speed by means of the position detector, wherein the switching controller further controls so as to force each of the transistors into the OFF state for a predetermined duration in a predetermined cycle, and the position detector detects only while the switching controller forcedly keeps the transistor in the OFF state.
摘要:
A motor comprising: Q-phase windings; voltage supplying unit; power supplying unit having Q first power transistors and Q second power transistors for supplying a power to said Q-phase windings; voltage detecting unit; state shifting unit; activation control unit; and switching operation unit. The switching operation unit includes switching control circuit for producing a main switching pulse and an auxiliary switching pulse, said switching operation circuit executing high-frequency switching operation of at least one second power transistor among said Q second power transistors responding with said auxiliary switching pulse signal when two first power transistors among said Q first power transistors simultaneously execute high-frequency switching operation responding with said main switching pulse signal while at least another second power transistor among said Q second power transistors executes an ON operation.
摘要:
A disk drive apparatus comprising Q phase windings; voltage supplying means; Q first power amplifying means, each one of which including a first power transistor; Q second power amplifying means, each one which including a second power transistor; altering signal producing means for producing altering signals; commanding means for producing a command signal; and switching operation means for producing a modified command signal which responds with said command signal of said commanding means and has a part varied in response to at least an output signal of said altering signal producing means, producing a current detected signal in response to a current to said Q-phase windings from said voltage supplying means, and causing at least one power transistor among Q of said first power transistors and Q of said second power transistors to perform high-frequency switching in response to said modified command signal and said current detected signal.
摘要:
FET power transistors of a power supplying part execute high-frequency switching operation and form current paths to three-phase windings. A voltage detecting part compares terminal voltages of the three-phase windings and produces a detected pulse signal in response to a comparison result. A state shifting part and an activation control part control active periods of the FET power transistors in response to the detected pulse signal. A commanding part produces a command signal in response to an output pulse signal of the voltage detecting means. A switching operation block produces a switching pulse signal in response to a comparison result of a current-detection signal with the command signal, and causes at least an FET power transistor of the power supplying part to perform high-frequency switching in response to the switching pulse signal. The state shifting part produces a timing signal after an adjust time from the detection of the detected pulse signal and shift-holds a holding state in response to the timing signal. The state shifting part changes the adjust time smaller in case that the command signal is larger than a predetermined value, thereby making the product value of the adjust time and the rotational speed smaller in the case.
摘要:
First power transistors of first power amplifying parts and second power transistors of second power amplifying parts form current paths from a DC power source to three-phase windings. A first distribution control block activates the first power amplifying parts with first three-phase signals, each having an active electrical angle larger than 120 degrees. A second distribution control block activates the second power amplifying parts with second three-phase signals, each having an active electrical angle larger than 120 degrees. A switching operation block has a current detecting part and a switching control part. The current detecting part obtains a current detected signal corresponding to a composed supply current of negative or positive parts of the three-phase drive currents to the three-phase windings. The switching control part compares an output signal of the current detecting part with a command signal and switches at least one power transistor of the first power transistors and the second power transistors to an off state when the output signal of the current detecting part becomes a value corresponding to the command signal, thereby causing the at least one power transistor to perform high-frequency switching responding with a comparison result.
摘要:
In a brushless motor having a field permanent-magnet part, an altering signal producing circuit produces altering signals which vary analogously with output signals of a position detector. Then, at least one distributing circuit distributes current to first and/or second three-phase distributed current signals which vary analogously with the output signals of the altering signals. The first and/or second distributed current signals may be composed by a distributing composer to produce three-phase distributed signals. A driving block uses the three-phase distributed signals to produce driving signals for the three-phase coils.