Abstract: A detecting period of a stepping motor is divided into a first segment for detecting an induced signal generated at least in a second quadrant by the rotation of a rotor immediately after the driving of a main driving pulse, a second segment being provided after the first segment for detecting the induced signal in a third quadrant, and a third segment provided after the second segment and the control circuit drives the stepping motor by the predetermined fixed main driving pulse having energy not smaller than the maximum energy when a rotation detecting circuit does not detect the induced signal exceeding a reference threshold voltage in the second segment at the time of the rotational driving by the main driving pulse having the maximum energy.

Abstract: According to a stepping motor control circuit of the invention, a rotation detecting period is divided into a first segment for detecting an induced signal generated at least in a second quadrant by the rotation of a rotor immediately after driving of a main driving pulse, a second segment being provided after the first segment for detecting the induced signal in a third quadrant, and a third segment provided after the second segment and, when a stepping motor detects the induced signal exceeding a reference threshold voltage in the first segment and the second segment, a control circuit controls a pulse down counter circuit to output a pulse down control signal.

Abstract: An invention allows a stepping motor to be reliably driven to rotate when initializing the driving and allows power consumption of the stepping motor to be reduced. The controller, when initializing the driving (for example, replacing a battery), controls a main drive pulse generator to drive a stepping motor using a main drive pulse having a maximum energy and sets the generation cycle of a pulse down control signal of a pulse down counter for pulsing down the main drive pulse to a first cycle to drive the stepping motor, and when pulsing down the main drive pulse to that having a predetermined energy, changes the generation cycle of the pulse down control signal of the pulse down counter to a second cycle.

Abstract: The present invention aims to prevent a nonrotation state from being brought about even when a drive allowance is changed by variations in a stepping motor or the like. A pulse down counter circuit outputs pulse down control signal for subjecting main drive pulse to control pulse down when time is counted for a predetermined time period. When a detecting signal exceeding a reference threshold voltage detected by a rotation detecting circuit is detected at a first detection section at start of a rotation detecting time period, a control circuit resets the pulse down counter circuit. Thereby, a main drive pulse generating circuit is not subjected to control pulse down by the pulse down counter circuit, and therefore, it is prevented that the main drive pulse is subjected to pulse down unnecessarily.

Abstract: Disclosed are a cooling system, a cooling method, and an electronic apparatus which easily allow a reduction in size and which help to achieve an improvement in terms of energy efficiency. The cooling system uses a liquid constituting a fuel of a fuel cell as a cooling medium.

Abstract: A wristwatch with an oscillation alarm uses an ultrasonic motor as its drive source. A vibration member has a piezoelectric element adhered thereto on one side and comb-like projections on the other side. A rotor has a sliding member composed of resin at its contacting portion with the comb-like projections and an eccentric weight at its outer circumferential portion. Shock absorbers are sandwiched between the weight and the rotor to absorb shocks applied to the rotor and thus prevent rotor damage. In the vicinity of the upper or lower side of the weight, there is disposed an abutment portion made of rigid material, the abutment portion abutting with the weight when shocks of large magnitude are applied to the rotor to assist the shock absorbers in preventing damage to the rotor.