Abstract: A single element of an ultrasonic transducer includes at least one combination of an equivalent series capacitor C1, an equivalent series inductor L1, and an equivalent series resistance R1. The ultrasonic transducer further includes an equivalent parallel capacitor C0. An inductor L2 is connected in series between the ultrasonic transducer and the drive circuit. A first resonance frequency of the equivalent series capacitor C1 and the equivalent series inductor L1 is F0. A second resonance frequency determined by at least the equivalent parallel capacitor C0 and the inductor L2 is Fp. A drive circuit drives the ultrasonic transducer while switching the driving frequency of the ultrasonic transducer to one of the resonance frequency F0 and the resonance frequency Fp.

Abstract: A single element of an ultrasonic transducer includes at least one combination of an equivalent series capacitor C1, an equivalent series inductor L1, and an equivalent series resistance R1. The ultrasonic transducer further includes an equivalent parallel capacitor C0. An inductor L2 is connected in series between the ultrasonic transducer and the drive circuit. A first resonance frequency of the equivalent series capacitor C1 and the equivalent series inductor L1 is F0. A second resonance frequency determined by at least the equivalent parallel capacitor C0 and the inductor L2 is Fp. A drive circuit drives the ultrasonic transducer while switching the driving frequency of the ultrasonic transducer to one of the resonance frequency F0 and the resonance frequency Fp.

Abstract: An imaging system for use in a vehicle includes an imaging unit having a lens for imaging a state of affairs and a rotation mechanism for defining a state of the lens of the imaging unit. The rotation mechanism is operated to be either in a first position or in a second position. That is, the first position of the rotation mechanism arranges the lens in a state of separation from a room in the vehicle, and the second position of the rotation mechanism arranges the lens in a state of exposure to the room in the vehicle.

Abstract: An imaging device for use in a vehicle includes an imaging unit having a lens for imaging a state of affairs and an exposure control unit for controlling exposure of the imaging by the imaging unit. The imaging unit images substantially a whole perspective in the vehicle including at least portions of windows on lateral sides of the vehicle. The exposure control unit uses brightness of an area in a predetermined frame of an image taken by the imaging unit for determining the exposure of the imaging, and the area in the predetermined frame in the image is set to be positioned at a proximity of a target area of the imaging.

Abstract: A load drive control system for use with an automobile one-touch window glass or sunroof opening and closing system or antenna vertical movement control system includes a signal holding switching circuit responsive to an instruction signal for driving a reversible drive motor in the forward or reverse direction and also to a motor drive current detection signal and functioning to hold the forward or reverse rotation of the motor within a predetermined load range and emergency stopping the motor when the motor load current gets out of the predetermined range. It also includes a signal hold inhibiting circuit to permit a desired extent of motor rotation to be obtained according to the forward or reverse drive instruction signal.