Abstract: Plural thin plate projecting portions are integrally and projectingly provided on an outer peripheral portion of a side plate member of a bobbin. Each of the thin plate projecting portions comprises a circumferential rib, a slit portion and a reinforcement rib. The circumferential rib is provided on an outer peripheral face of the thin plate projecting portion of the bobbin and then a gap is formed between a claw-shaped magnetic pole of a rotor core and the thin plate projecting portion. A varnish material etc. is caused to adhere to and harden in this gap. By filling a root portion of the claw-shape magnetic pole of the rotor core with varnish material, the resonance vibration in the rotor core can be restrained. As a result, an alternating current generator for use in a vehicle having the small magnetic noise can be obtained.

Abstract: There is disclosed an ultrasonic diagnosis apparatus comprising a transmission/reception unit, a signal processing unit, a conversion unit, and a display unit. The transmission/reception unit transmits/receives ultrasonic waves to/from an object to be examined, thereby obtaining ultrasonic reception signals. The signal processing unit executes signal processing of the ultrasonic reception signals to obtain ultrasonic images. The conversion unit converts an ultrasonic image having a predetermined dynamic image obtained from the object to be examined to which a contrast medium is injected into an ultrasonic image having a dynamic range corresponding to that of the display unit. The display unit displays the ultrasonic image obtained by the conversion unit.

Abstract: An ultrasonic diagnostic apparatus is used to obtain ultrasonic tomography images of subjects under examination.

Abstract: The present invention provides a magnetic recording medium which can prevent mold from generating in the magnetic medium without degrading physical and electromagnetic conversion characteristics of the magnetic medium. Anti-mold agents specified by chemical formulas (1) through (7) are employed in magnetic layers or over-coat layers which are overlaid on non-magnetic bases.

Abstract: An ultrasonic probe has a plurality of ultrasonic transducer elements arranged in a row. A plurality of signal electrodes are provided at one side of the transducer elements. An earth electrode is provided at the other side of the transducer elements. Each of a plurality of signal conductive members is connected to a corresponding signal electrode. An earth conductive member is connected to the earth electrode. The signal conductive members are located close enough to the earth conductive member to sufficiently reduce a mutual inductance generated between said signal conductive members. Therefore, an amount of crosstalk generated between the signal conductive members is reduced.

Abstract: In an ultrasonic diagnostic apparatus in which ultrasonic echo beams is focused three-dimensionally, a probe employs plural transducers arranged in two directions, lateral and azimuth directions. The transducers arranged in each azimuth direction are connected to a transmitting-receiving channel in a transmitting-receiving portion via a switch circuit. The switch circuit operates on the control of a switching controller and can connect a transducer selected by the controller in the azimuth direction to the transmitting-receiving channel. Output signals from the transmitting-receiving portion are supplied to a signal processing portion, in which beam forming for three-dimension echo beams is carried out by using a beam former. Thus, transducers arranged on each line in the lateral direction can be driven simultaneously, resulting in a more compact circuit and a reduced number of transmitting and receiving for better real-time processing.

Abstract: In an ultrasound diagnosis apparatus, a focusing point of received ultrasound beams is moved along a transmission direction of the ultrasound beams so as to receive echo signals at all the focusing points on a scan line by one transmission operation. Reception opening portions of an ultrasound probe are changed to receive and add the echo signals in a plurality of directions at the respective focusing points, thereby reducing a speckle noise.

Abstract: An ultrasonic imaging apparatus comprises an ultrasonic transducer for outputting ultrasonic beams and converting echo waves of the ultrasonic beams to a B-mode echo signal corresponding to a B-mode for obtaining a tomographic image and a D-mode echo signal corresponding to a D-mode for obtaining Doppler data, a transmitter circuit for driving the transducer for generating the ultrasonic beams for scanning a subject, a receiver circuit including a gain control circuit for controlling the gain of the B-mode and D-mode echo signals output from the ultrasonic transducer so that the level of the B-mode echo signal is made to equal to that of the D-mode echo signal and for outputting gain-controlled echo signals, and A/D converter for converting the gain-controlled signals to digital signals, and a delay/addition circuit for delaying the digital signals and adding them to output a received signal, a B-mode processor circuit for producing a B-mode image signal from the received signal, a D-mode processor circuit fo

Abstract: In the ultrasonic imaging apparatus according to the present invention, ultrasonic transducers provided in a probe for corresponding channels are driven and caused to propagate ultrasonic waves by a standard signal generating circuit, transmission delay circuits and pulsers. Then, receiving signals obtained from the ultrasonic transducers are delayed in an analog manner by analog delay circuits. The resulting delayed signals are A/D converted by analog/digital converters. The outputs of the A/D converters are delayed in a digital manner by digital delay circuits composed of semiconductor memory elements. The resulting delayed outputs are summed by a summing circuit. The output of the summing circuit is detected. Predetermined imaging data is produced based on the detected output and displayed. In order to enhance delay precision of the analog/digital converters and digital delay circuits, the delay amount of the analog delay circuits can be continuously varied in small steps.

Abstract: A system and method for measuring the sound velocity of the internal tissue within an object to be investigated. First and second pulses of ultrasonic energy are transmitted along a common, steered transmitting beam into the object by a first subarray of transducer elements that are a distinct part of an array of transducer elements. The echoes of the first and second pulses return to the transducer array along a first and a second parallel steered receiving beams, activated by a second and third subarrays of transducer. The system measures the propagation times for the first and second pulses to leave and return to the array. The average sound velocity of the internal tissue of the object can be determined from the measured propagation times and the known geometric characteristics of the array, subarray, and steered angles, without the measurement being adversely affected by a fat or muscle layer covering the internal tissue.

Abstract: An ultrasonic measuring apparatus having an ultrasonic transducer array for transmitting ultrasonic beams and receiving echoes corresponding to the beams. The array is divided into a transmission section and a reception section. The transducer elements of the transmission section emit sequentially ultrasonic beams at a predetermined angle to a plurality of targets in a subject. The elements of the reception section receives echoes corresponding to the ultrasonic beams and coming at a predetermined angle, i.e., from the direction crossing the transmission ultrasonic beam and converts the echoes to echo signals. The echo signals are added or averaged, thereby obtaining the time which ultrasonic waves require to propagate through the subject. The sound velocity at which the ultrasonic waves travel in the subject is calculated from this propagation time.