Abstract:
Provided is a vehicle approach warning device which performs abnormality detection in various abnormal modes. A vehicle approach warning device emits a vehicle approach sound by causing a sound output from a microcomputer (21) to pass through an AMP (22) and an HPF (24) and applying output voltage (VOUT) corresponding to the sound output to a loudspeaker (3). The vehicle approach warning device is provided with a voltage sensor circuit (25) for monitoring the output voltage (VOUT), and produces an output for checking, as the sound output, when detecting an abnormality. As the output for checking, a frequency within a speaker resonant frequency band, for example, a single-frequency output that is difficult to recognize by a user and has low frequency at which the reproduction capability of the speaker is low is used. The abnormality detection is performed on the basis of whether or not an integration circuit voltage outputted by the voltage sensor circuit (25) falls within a voltage range defined as a threshold for abnormality detection.
Abstract:
PROBLEM TO BE SOLVED: To provide a vehicle approach report device capable of generating a report sound containing a low sound, even if a large-sized speaker such as a woofer is not used.SOLUTION: When the report sound is to be reproduced by making the report sound contain 250 Hz (the low sound difficult to be reproduced in a small-sized speaker), a signal generation part generates "many beat frequency signals" which have an overtone relationship with 250 Hz and are spaced by 250 Hz. Beat phenomena are generated at intervals of "250 Hz" in reproduced sound in the small-sized speaker, and the "250 Hz" which is not produced from the small-sized speaker can be heard as if the "250 Hz" were produced from the small-sized speaker by the beat phenomena. As a result of this, the report sound containing the "250 Hz" which cannot be reproduced in the small-sized speaker can be generated to the outside of a vehicle without using the large-sized speaker such as the woofer.
Abstract:
Piezoceramic bending transducer has a base (3) on which a stack of piezoceramic layers (6) is mounted. These have electrodes (7, 8) between them. A compensating layer (10) is mounted on the opposite side of the carrier to the piezoceramic. This is made from a material with the same coefficient of thermal expansion as it.
Abstract:
PURPOSE:To enable to correctly determine the cause of an abnormal operation, if any, and facilitate maintenance, inspection, repair and the like, by providing an indicator for indicating operating conditions of an ultrasonic vibrator and a controlling circuit for driving the indicator. CONSTITUTION:A power source is thrown in, a starting switch 19 is depressed, a vibrator-driving circuit 3 is made to be effective by a CPU10 through an output port 14, a high-frequency signal is supplied to the ultrasonic vibrator 1, and a mechinaing horn 2 is reciprocated, thereby conducting ultrasonic machining on the work. The vibration quantity of the vibrator 1, a value detected by a voltage difference detecting circuit 6, the quantity of an electric current supplied to the circuit 3 and the like and indicated on am ammeter 9. The thus indicated values are compared with data stored in an ROM11 by a CPU10, and when an abnormal condition is present, an LED's 23a, 23b, 23c or the like is turned ON to inform the operator of the abnormal condition.
Abstract:
Bei einem handgeführten Elektrowerkzeug (100) mit einer Antriebseinheit (103) zum schwingenden Antrieb eines Einsatzwerkzeugs (130), die mindestens einen schwingfähigen Anregungsaktor (105) aufweist, der mit einem Koppelelement (110) zur Übertragung von Schwingungen auf das Einsatzwerkzeug (130) gekoppelt ist, die vom Anregungsaktor (105) im Betrieb der Antriebseinheit (103) beim Anlegen einer vorgegebenen Ansteuerspannung an den Anregungsaktor (105) erzeugt werden, wobei der Anregungsaktor (105) mindestens ein Anregungselement (132, 134) aufweist, das aus einem piezoelektrischen Material ausgebildet ist, ist dem Anregungsaktor (105) zur Erfassung seiner jeweils aktuellen Betriebstemperatur ein Temperatursensor (199) zugeordnet, um eine von der jeweils aktuellen Betriebstemperatur abhängige Anpassung der vorgegebenen Ansteuerspannung zu ermöglichen.
Abstract:
Delay line memory device, systems and methods are disclosed. In one aspect, a delay line memory device includes a substrate; an electronic unit disposed on the substrate and operable to receive, amplify, and/or synchronize data signals into a bit stream to be transmitted as acoustic pulses carrying data stored in the delay line memory device; a first and a second piezoelectric transducer disposed on the substrate and in communication with the electronic unit, in which the first piezoelectric transducer is operable to transmit the data signals to the acoustic pulses that carry the data through the bulk of the substrate, and the second piezoelectric transducer is operable to transduce the received acoustic pulses to intermediate electrical signals containing the data, which are transferred to the electronic unit via an electrical interconnect to cause refresh of the data in the delay line memory device.