Abstract: A locking device for the scanning mechanism of a laser scriber of the type having a stationary laser head comprises an actuator operable in association with the table drive mechanism and a presser element operable under the action of the actuator to move one of the scanning tables against the guide structure provided for the table to prevent oscillatory or other displacement of the table in its guided direction during the scanning movement of the other table. As a result, a practically true straight line of scan is obtained, thereby eliminating the danger of the laser beam incising the work sheet beyond a definite range of allowance.
Abstract: Fine crystalline powder, from 0.02 to 0.2 micron in average particle size, of a composition Pb(Zr.Ti)O.sub.3. Parts of Zr and Ti of the composition may be substituted for with Mn and Sb, Nb, and/or Ta. The powder is produced by preparing an acidic aqueous solution of the constituent metallic ions, neutralizing the solution to provide a suspension of hydroxides of the metals, and subjecting the suspension to hydrothermal reaction at 150.degree.-300.degree.C. The powder provides piezoelectric ceramics of a high sintered density without resorting to hot pressing.
Abstract: A memory circuit employing insulated-gate field-effect transistors includes a first circuit for generating a signal upon the completion of one of the circuit functions involved in the operation of the memory circuit. That signal is applied to a second circuit which thereupon produces a timing signal that is used to control a second circuit function of the memory circuit.
Abstract: A leaf spring and contact arrangement for an electromagnetic switch. A movable contact has a magnetic body attached thereto and is restrained by side arms secured to a housing and bent arms connecting the contact member to the side arms. The side arms are arranged symmetrically about the center of gravity of the movable contact. The contact member, side arms and bent arms are all in substantially the same plane. A magnetic force overcoming the restraining force causes movement of the movable contact in a direction perpendicular to said plane. The leaf spring may be formed in a repeat pattern consisting of a plurality of movable contacts each having a pair of bent arms associated therewith for connecting the movable contact to the secured side arms.
Abstract: In a telephone system of the type in which two or more sets may be keyed into the same line, an exclusion circuit is provided which prevents all other sets from accessing a given line once the line is accessed by any one set. The exclusion circuit eliminates a relatively expensive thyristor or SCR circuit and substitutes a simple flip-flop circuit. The flip-flop circuit controls a relay which in turn controls connection of the line contacts to the speech circuit. When a key is depressed to select a line and when the telephone is off-hook, voltage is supplied to the flip-flop. The latter circuit is structured so that it assumes a first stable state whereby the relay is energized and the speech network is disconnected from the line. The relay also throws a switch which connects the control line associated with the selected line circuit to a trigger input of the flip-flop.
Abstract: A demodulation system for use in a vestigial sideband system of an over-modulation type including a sampler for sampling a reduced carrier frequency component from a received modulated wave to be used for demodulation. A discriminator is operative to detect a vertical synchronizing signal portion in a vertical blanking period and thereupon to actuate the sampler, causing a carrier burst signal to build up. The carrier burst signal is subjected to filtering to derive a carrier wave which is supplied to a demodulator. A synchronizing pulse separator is connected to the demodulator to separate horizontal synchronizing pulses from a demodulated output, which pulses are fed back to the sampler to actuate it during the absence of the vertical synchronizing signal.
Abstract: When a plasma display panel driven by a conventional driving circuit therefor, spurious pulsed voltages appear across discharge cells which are in the vicinity of a selected discharge cell. A method and apparatus for driving a plasma display panel in a time division manner includes supplying the plasma display panel electrodes with suppress pulse trains for cancelling the spurious pulse voltages coupled thereto. The suppress pulse trains are in synchronism with, and of a polarity opposite to the driving pulses that are supplied to such electrodes in accordance with time division principles.
Abstract: A flat article separating apparatus for separating overlapping articles traveling along a feeding belt is disclosed. The apparatus includes a slipping section for causing overlapping articles to slip with respect to each other. Thereafter, the articles pass through a detector which detects the presence of an article and in response to such a detection, activates a moving roller aligned with a branching section of the feeding belt to cause the belt in the area of the branching section to bend. Bending of the feeding belt in the vicinity of the branching section allows the article in the branching section to be directed to a branch path of the feeding belt. Articles whose leading edges have passed the branching section at the time the moving roller is activated, continue to move along the main path of the feeding belt.
Abstract: An electromagnetic matrix switch device, suitable for use in an automatic exchange or computer, comprising a two-dimensional array of cross-point elements, each of which comprises a magnetically actuated switch adapted to bridge its associated pair of row and column signal lines and a magnetic core positioned in magnetically-coupled relationship to the switch to actuate it in response to a current pulse applied to its associated pair of row and column control lines. Each magnetic core has provided therearound first and second windings connected to its associated row control line and third and fourth windings connected to its associated column control line, the polarity of those windings being such that application of the current pulse to the row and column control lines will cause the first and fourth windings to produce magnetic fields in a direction opposite to those produced by the second and third windings.
June 19, 1974
Date of Patent:
April 27, 1976
Nippon Telegraph & Telephone Public Corporation, Nippon Electric Company, Limited
Abstract: Delayed pulses are produced by a circuit in which an initiating input pulse causes signals to be supplied to two threshold circuits. The outputs of the threshold circuits are supplied to a gate circuit having an output determined by the difference in time of occurrence of the trailing edges of the output pulses generated by the threshold circuits.
Abstract: Relatively large hologram storage plates, e.g., those storing a large number of discrete entries such as character definitions for a large character set, comprise an array of mini-holograms arranged in different memory plate sections.A different photodiode array is associated with each hologram plate section (for efficiency, some elements of different diode arrays may be common). When the stored contents of any mini-hologram are interrogated by a coherent light beam, the stored information is derived via the associated photodiode array and converged (as by OR logic) to memory output terminals.
March 12, 1974
Date of Patent:
April 6, 1976
Nippon Telegraph & Telephone Public Corporation, Nippon Electric Company Limited
Abstract: Electromechanical filters of the type having a plurality of resonators coupled to each other by couplers which make it possible to provide a transmission frequency characteristic with finite-attenuation poles are disclosed. The filters have a first resonator disposed on the input side and a second resonator disposed on the output side of the filter. A plurality of third resonators, at least two in number, are disposed between the first and second resonators. The third resonators are coupled mechanically in parallel to the first and second resonators by a plurality of couplers so that one of the first and second resonators is in reverse phase relationship with one of the third resonators. Also, the coupling coefficients between the couplers differ from each other.
Abstract: A machine comprises a wire station for supplying various wires, a harness board on which a cable harness is to be formed, and a harness laying head movable relative to the harness board for receiving selected one of the wires from the wire station laying the selected wire on the harness board. The wire station comprises a plurality of wire clampers for releasably clamping the respective wires with their free ends protruding approximately a predetermined length towards the harness laying head.
Abstract: An improved multilevel code transmission system for transmission of a data signal in the form of an N-level code signal based on a partial response shaping employs a special differential coding prior to partial response shaping on the transmitter side and, on the receiver side subsequent to partial response decoding, a differential decoding corresponding to the differential coding. The system is characterized in that each pair of input, parallel binary codes is so arranged that only the most significant bit is different from each other and the remaining bits are represented by the same binary codes, and in that only the most significant bit is affected by the differential coding and decoding.
Abstract: A semiconductor package device characterized by improved operation at ultra-high frequencies and by improved heat dissipation, includes an auxiliary metal stud mounted on a metal substrate. A semiconductor element, such as a field-effect transistor or bipolar transistor, is mounted on the auxiliary stud and has at least one electrode thereof electrically connected to the stud.
Abstract: An injection semiconductor laser having an active region normal to the reflecting surfaces includes an ohmic metal film on the side of the heat sink near the active region. The ohmic metal film is plated with a layer of a thermally conductive material. The shape and dimensions of the plated layer are selected to protect the laser from being damaged when the laser device is bonded to the heat sink, and also to prevent light rays emerging through one of the reflecting surfaces from impinging on the surface of the heat sink.
Abstract: A variable-resistance attenuator having first and second resistive layers deposited upon an insulating substrate. Input and output terminals are electrically connected at spaced intervals to one of the resistive layers and a common terminal is electrically connected to the remaining one of the resistive layers. A pair of contacts are adapted to make slidable electrical engagement, each with an associated one of the resistive layers. Conductive bridging means mechanically and electrically connect the sliding contacts. Mechanical means are provided for simultaneous movement of the sliding contacts to change the resistance in a smooth and continuous fashion.
Abstract: An amplitude limiter circuit utilizing two sets of seriesdiode limiter circuits is disclosed. Each diode circuit has a pair of diodes in series but in abutting polarity. An input signal is applied through a phase converter with equal amplitudes and in opposite phases to each other to the diode circuits and a bias current is applied to each pair of diodes. To obtain an output signal having its level variation suppressed the currents passing through the parallel capacitances of the diodes in each circuit are offset with each other thereby resulting in an output signal not being subject to a shift in response to the variation of the input signal level.
Abstract: A current-splitting network comprises a voltage divider having first and second output terminals, the potentials at the first and second output terminals having a predetermined ratio. A first amplifier is coupled between one end of a first resistor and the first output terminal for holding the potential of the one end of the first resistor substantially at the potential of the first output terminal. A second resistor has a resistance value which has a predetermined ratio to the resistance value of the first resistor, and a second amplifier is coupled between one end of the second resistor and the second output terminal to hold the potential of the one end of the second resistor substantially at the potential of the second output terminal. A constant-current source is connected in common to the other end of the first and second resistors such that a constant current fed from the constant-current source is split to flow through the first and second resistors.
Abstract: In a velocity modulation tube comprising a floating prebuncher and at least one final prebuncher, frequencies of respective fundamental modes of resonance of the input cavity, the floating prebuncher, and the final buncher are adjusted to the lowest frequency of the passband of the tube, adjacent to the highest frequency of the passband, and higher than the highest frequency, respectively. Furthermore, the Q-value of the floating prebuncher is made equal to or lower than that of the input cavity. Naturally, the output cavity has its fundamental mode of resonance approximately at the center of the passband.