Abstract: A semiconductor device has: a memory element which is arranged on a semiconductor substrate and records information therein; a terminal for inputting first voltage for recording the information to the memory element and second voltage lower than the first voltage for reading out the information from the memory element; and an electrostatic discharge protection circuit which is connected to the terminal. The electrostatic discharge protection circuit includes a diode whose cathode is connected to the first terminal and whose anode is connected to a ground potential, and a first MOS transistor whose drain and gate are connected to the terminal and whose source and back gate are connected to the ground potential.

Abstract: A recording head or the like having a voltage generating circuit which does not depend on a voltage fluctuation of a heater driving power source (first power source) is provided. The recording head has: a plurality of heaters connected to a power line VH as a heater driving power source; a power transistor as a switching element for independently driving each heater by supplying a current thereto; and a voltage generating circuit for supplying a voltage for a control signal for controlling the power transistor. The voltage generating circuit has a resistor R1 connected to a grounding potential and an n-type MOS transistor T1 in which a reference voltage V1 which is generated by supplying a constant current from a constant current source I0 to the resistor R1 is inputted to a gate.

Abstract: A semiconductor device has: a memory element which is arranged on a semiconductor substrate and records information therein; a terminal for inputting first voltage for recording the information to the memory element and second voltage lower than the first voltage for reading out the information from the memory element; and an electrostatic discharge protection circuit which is connected to the terminal. The electrostatic discharge protection circuit includes a diode whose cathode is connected to the first terminal and whose anode is connected to a ground potential, and a first MOS transistor whose drain and gate are connected to the terminal and whose source and back gate are connected to the ground potential.

Abstract: There is provided an ink jet head substrate which can sufficiently suppress generation of noises at the time when heating elements are driven, and which can be constituted small in size. In an ink jet head substrate including a plurality of heating elements, a power transistor for driving the heating elements according to image data, an input pad of a heat pulse (pulse width regulating signal) for regulating a width of a drive pulse to be applied to the heating elements, and a block selection unit for dividing the plurality of heating elements into blocks for a predetermined number of heating elements to drive the heating elements in a time division manner with the divided block as a unit, a delay circuit group consisting of a logic circuit (delay circuit) for supplying a drive pulse, which is applied to the heating elements in a selected block, at staggered timing is provided in a line of a heat pulse.

Abstract: A recording head or the like having a voltage generating circuit which does not depend on a voltage fluctuation of a heater driving power source (first power source) is provided. The recording head has: a plurality of heaters connected to a power line VH as a heater driving power source; a power transistor as a switching element for independently driving each heater by supplying a current thereto; and a voltage generating circuit for supplying a voltage for a control signal for controlling the power transistor. The voltage generating circuit has a resistor R1 connected to a grounding potential and an n-type MOS transistor T1 in which a reference voltage V1 which is generated by supplying a constant current from a constant current source I0 to the resistor R1 is inputted to a gate.

Abstract: In a case where first wirings (wirings for a driving power supply (VH)) commonly connected to a plurality of electro-thermal converting elements and adapted to supply an electric power to the plurality of electro-thermal converting elements and second wirings (high voltage grounding wirings (GNDH)) for connecting source areas of respective switching elements to grounding potential are provided, resistance of the second wiring is selected to be smaller than resistance of the first wiring.

Abstract: A semiconductor device having a high source breakdown voltage and high performance and high reliability and a liquid jet apparatus are provided. In a semiconductor device having a switching element for flowing current through a load and a circuit for driving the switching element, respectively formed on the same substrate, the circuit has a source follower transistor for generating a drive voltage to be applied to a control electrode of the switching element, and the source region of the source follower transistor has a first doped region connected to the source electrode and a second doped region having an impurity concentration lower than that of the first doped region, the second doped region forming a pn junction with a semiconductor region forming a channel.

Abstract: In a case where first wirings (wirings for a driving power supply (VH)) commonly connected to a plurality of electro-thermal converting elements and adapted to supply an electric power to the plurality of electro-thermal converting elements and second wirings (high voltage grounding wirings (GNDH)) for connecting source areas of respective switching elements to grounding potential are provided, resistance of the second wiring is selected to be smaller than resistance of the first wiring.

Abstract: There is provided an ink jet head substrate which can sufficiently suppress generation of noises at the time when heating elements are driven, and which can be constituted small in size. In an ink jet head substrate including a plurality of heating elements, a power transistor for driving the heating elements according to image data, an input pad of a heat pulse (pulse width regulating signal) for regulating a width of a drive pulse to be applied to the heating elements, and a block selection unit for dividing the plurality of heating elements into blocks for a predetermined number of heating elements to drive the heating elements in a time division manner with the divided block as a unit, a delay circuit group consisting of a logic circuit (delay circuit) for supplying a drive pulse, which is applied to the heating elements in a selected block, at staggered timing is provided in a line of a heat pulse.

Abstract: A semiconductor device having a high source breakdown voltage and high performance and high reliability and a liquid jet apparatus are provided. In a semiconductor device having a switching element for flowing current through a load and a circuit for driving the switching element, respectively formed on the same substrate, the circuit has a source follower transistor for generating a drive voltage to be applied to a control electrode of the switching element, and the source region of the source follower transistor has a first doped region connected to the source electrode and a second doped region having an impurity concentration lower than that of the first doped region, the second doped region forming a pn junction with a semiconductor region forming a channel.

Abstract: An ultrasonic testing method uses surface waves to prevent false detection of primary cracks, to lower the level of structural noises from grain boundaries, and to improve the detectability in the ultrasonic testing by surface wave testing of hot rolling rolls. A surface wave probe 10 capable of transmitting and receiving a surface wave is provided with a piezoelectric element 10A, a resin wedge 10C disposed on the front surface of the piezoelectric element 10A and a damping block 10B disposed on the back surface. The surface wave probe 10 is driven to produce a short pulse having a pulse length being at most 2.5 times the wavelength of the surface wave to be produced. A coupling liquid medium is supplied to the probe 10 in accordance with the peripheral speed of the roll to be tested. Depending on the height of the reflected waves measured, the grinding allowance of the roll is determined, and the roll is ground according to the thus-determined grinding allowance.

Abstract: An ultrasonic testing method uses surface waves to prevent false detection of primary cracks, to lower the level of structural noises from grain boundaries, and to improve the detectability in the ultrasonic testing by surface wave testing of hot rolling rolls. A surface wave probe 10 capable of transmitting and receiving a surface wave is provided with a piezoelectric element 10A, a resin wedge 10C disposed on the front surface of the piezoelectric element 10A and a damping block 10B disposed on the back surface. The surface wave probe 10 is driven to produce a short pulse having a pulse length being at most 2.5 times the wavelength of the surface wave to be produced. A coupling liquid medium is supplied to the probe 10 in accordance with the peripheral speed of the roll to be tested. Depending on the height of the reflected waves measured, the grinding allowance of the roll is determined, and the roll is ground according to the thus-determined grinding allowance.

Abstract: A videotext receiver receives textual and graphic data including control data, header data and main text data. The videotext receiver includes a RAM for storing the textual and graphic data of a plurality of programs in a received broadcast signal, a microprocessor having a header selector for selecting the header data in the textual and graphic data stored in RAM, and a memory for storing a plurality of the selected header data. The selected header data is displayed on a CRT in a list format.

Abstract: A tonearm control device in which tonearm position is detected by counting output pulses generated in response to a reversible electric motor output used for providing horizontal tonearm movement. A sensor is employed to detect non-recorded portions between recorded bands of music and also the initial position of a record disk. The sensor is supported on a supporting arm separate from the tonearm. The output pulses are counted in a counter of a RAM and the number of pulses corresponding to a distance between the sensor and the stylus of the cartridge is added in an adder in a CPU to the content of the counter. The output of the CPU is memorized in assigned positions of a memory in the RAM, the number of which corresponds to numbers of selected music. The contents of the memory are compared with the output pulses. When coincidence occurs, reproduction of the band of music is achieved. Hence, it is possible to change the cartridge independent of the sensor.

Abstract: A tonearm control device in which tonearm position is detected by counting pulses generated in response to the reversible electric motor output used for providing horizontal tonearm movement. A sensor is employed to detect non-recorded portions between recorded bands and also the initial band. Output pulses are counted in an up counter of a RAM and the counter is compared with a memory stored selection order. When coincidence occurs reproduction of that band is achieved. The counter is controlled to inhibit counting over areas previously scanned. Hence, it is possible to play bands out of order once the portions to be played are scanned.

Abstract: A two-way CATV system having a substantial number of terminals incorporates a central processor and transmitter system which continually interrogates the terminals at high speed, monitoring changes of usage of premium programs and other data while also permitting central control of access to restricted premium programs. For inexpensive but reliable intercommunication, short, fixed word length digital messages are frequency multiplexed onto the cable in both upstream and downstream directions, and subscriber groups are controllably selected in turn, with each subscriber being scanned in what may be an arbitrary order by transmission of unique private messages which are recognized at the terminal and in response to which previously prepared fixed length messages are immediately transmitted in return.