Abstract: A remote-readable identification tag (T) that is provided with at least two resonance circuits (81 . . . 8n) and at least one transmitter/receiver antenna system (1) coupled with the circuits. The at least two circuits have a respectively different resonant frequency. A delay device (6) of the remote-readable identification tag delays a signal response between a signal received by the antenna system and a signal emitted in response by the antenna system, e.g., by delaying feeding the received signal into the resonance circuits.

Abstract: A voltage generator (1) for conversion of non-electrical primary energy (PE) to a voltage signal (USIG, USIG?) by means of induction. The voltage generator (1) has at least one mechanical energy store (2) for holding the primary energy (PE), and which has at least one changeover point (P). At least one induction system (3) is provided which can be coupled to the mechanical energy store (2), with the mechanical energy store (2) carrying out a movement on reaching the at least one changeover point (P) by means of which movement a voltage signal (USIG, USIG?) can be induced in the induction system (3).

Abstract: A remote-readable identification tag (T) that is provided with at least two resonance circuits (81 . . . 8n) and at least one transmitter/receiver antenna system (1) coupled with the circuits. The at least two circuits have a respectively different resonant frequency. A delay device (6) of the remote-readable identification tag delays a signal response between a signal received by the antenna system and a signal emitted in response by the antenna system, e.g., by delaying feeding the received signal into the resonance circuits.

Abstract: A piezoelectric drive element which surrounds an ink channel in a writing jet in a mosaic printing device is a winding formed by plies of thin synthetic foil having piezoelectric properties. The plies of the foil contact adjacent plies over large areas of adjacent plies and form a compression chamber in the interior of the winding which surrounds the ink chamber. Application of a voltage of a first polarity to the winding expands the winding and application of a voltage having an opposite polarity then contracts the winding forcing ink out of the chamber for printing. The winding and chamber may be surrounded by a covering of silicon rubber.

Abstract: Burglar alarm apparatus includes an ultrasonic transmitter and an electromagnetic radiation transmitter whose signals are Doppler frequency shifted by an object moving through the radiation fields, the signals being received by respective demodulating receivers which provide respective electrical signals corresponding to the Doppler frequency. Frequency conversion apparatus is connected to one of the receivers to convert the output frequency thereof by a predetermined ratio to normalize or equalize the frequencies and a signal comparison circuit is provided to produce a signal in response to a ratio of the Doppler shifted signals within a predetermined tolerance range.

Abstract: The invention relates to a piezoelectric drive element for cast printer heads used in ink-operated mosaic printer units in which printing liquid is ejected droplet fashion by a mechanism of piezoelectric contraction of the cylindrical drive elements which surround the ink passages, said drive element comprising a plurality of drive electrodes in furtherance of the proposed operation in accordance with the teachings of this invention.

Abstract: A mosaic printing head for typewriters, data printers, teleprinters and the like, utilizing dot-producing pin-like printing elements for recording characters in the form of a dot pattern upon a data carrier, employing a plurality of dot forming elements, each of which is adapted to be actuated by an elongated, piezoelectric transducer which is subjected to electric fields in rapid succession to effect changes in the length of each transducer and thereby produce driving forces upon the associated element.

Abstract: An arrangement for mounting one end of a piezoelectric element operating in a bending mode about the one end to generate essentially linear movement for a part of a moving component operatively attached to the other end characterized by a support strip adjacent a side of the element at the point of mounting and extending parallel along the element to modify the stresses applied to the element during a bending operation to prevent damage thereto. The piezoelectric element comprises a carrier strip having at least one side in contact with a ceramic strip or layer and the support strip is disposed adjacent the one end to modify the stresses applied to the ceramic strip to prevent damage thereto. The support strip is provided with a shape and size so that the maximum stress applied to the element occur at a point removed from the point of mounting.