Abstract: A wave soldering tank includes a soldering tank body for housing molten solder and a solder feed chamber disposed within the soldering tank body. An axial-flow, multiple-blade screw-type pump is disposed so as to draw molten solder into the solder feed chamber through an inlet and discharge the molten solder through an outlet. In a preferred embodiment, the pump includes a rotatable hub and a plurality of helical blades secured to the hub at equal intervals in the circumferential direction of the hub, each of the blades overlapping an adjoining one of the blades when the blades are viewed in the axial direction of the impeller.

Abstract: A digital/analog conversion apparatus to convert a digital signal into an analog signal. The digital/analog conversion apparatus can generate a high-quality analog signal, even when elements configuring the digital/analog conversion apparatus have variance, with high resolution and a small circuit size. The data conversion apparatus is provided with a first data converter to reduce the number of bits of an input signal, a second data converter to convert the format of the first output signal, and a third data converter for conversion into a code which corresponds to the history of the output from the second data converter.

Abstract: A digital/analog conversion apparatus to convert a digital signal into an analog signal. The digital/analog conversion apparatus can generate a high-quality analog signal, even when elements configuring the digital/analog conversion apparatus have variance, with high resolution and a small circuit size. The data conversion apparatus is provided with a first data converter to reduce the number of bits of an input signal, a second data converter to convert the format of the first output signal, and a third data converter for conversion into a code which corresponds to the history of the output from the second data converter.

Abstract: A digital/analog conversion apparatus to convert a digital signal into an analog signal. The digital/analog conversion apparatus can generate a high-quality analog signal, even when elements configuring the digital/analog conversion apparatus have variance, with high resolution and a small circuit size. The data conversion apparatus is provided with a first data converter to reduce the number of bits of an input signal, a second data converter to convert the format of the first output signal, and a third data converter for conversion into a code which corresponds to the history of the output from the second data converter.

Abstract: A digital/analog conversion apparatus for converting a digital signal into an analog signal. The digital/analog conversion apparatus can generate a high-quality analog signal, even when elements configuring the digital/analog conversion apparatus have variance, with high resolution and a small circuit size. The data conversion apparatus is provided with a first data converter for reducing the number of bits of an input signal, a second data converter for converting the format of the first output signal, and a third data converter for conversion into a code which corresponds to the history of the output from the second data converter.

Abstract: A wave soldering tank includes a soldering tank body for housing molten solder and a solder feed chamber disposed within the soldering tank body. An axial-flow, multiple-blade screw-type pump is disposed so as to draw molten solder into the solder feed chamber through an inlet and discharge the molten solder through an outlet. In a preferred embodiment, the pump includes a rotatable hub and a plurality of helical blades secured to the hub at equal intervals in the circumferential direction of the hub, each of the blades overlapping an adjoining one of the blades when the blades are viewed in the axial direction of the impeller.

Abstract: A wave soldering tank includes a soldering tank body for housing molten solder and a solder feed chamber disposed within the soldering tank body. An axial-flow, multiple-blade screw-type pump is disposed so as to draw molten solder into the solder feed chamber through an inlet and discharge the molten solder through an outlet. In a preferred embodiment, the pump includes a rotatable hub and a plurality of helical blades secured to the hub at equal intervals in the circumferential direction of the hub, each of the blades overlapping an adjoining one of the blades when the blades are viewed in the axial direction of the impeller.

Abstract: A map database site S comprises a map information database Sb for accumulating the map data constructed of units for displaying of unit images m each having a display range smaller than a display range of a map image M corresponding to one page of a map image displayed on a user terminal T, in association with position data indicating the display ranges of the individual unit images m. A user terminal T comprises map-image display means for combining the map data of a plurality of units with each other on the basis of the associated position data, which are read out from the map information database Sb provided in the map database site S and transmitted from the map database site S, to form the one-page map image M for display.

Abstract: A digital/analog conversion apparatus for converting a digital signal into an analog signal. The digital/analog conversion apparatus can generate a high-quality analog signal, even when elements configuring the digital/analog conversion apparatus have variance, with high resolution and a small circuit size. The data conversion apparatus is provided with a first data converter for reducing the number of bits of an input signal, a second data converter for converting the format of the first output signal, and a third data converter for conversion into a code which corresponds to the history of the output from the second data converter.

Abstract: A wave soldering tank includes a soldering tank body for housing molten solder and a solder feed chamber disposed within the soldering tank body. An axial-flow, multiple-blade screw-type pump is disposed so as to draw molten solder into the solder feed chamber through an inlet and discharge the molten solder through an outlet. In a preferred embodiment, the pump includes a rotatable hub and a plurality of helical blades secured to the hub at equal intervals in the circumferential direction of the hub, each of the blades overlapping an adjoining one of the blades when the blades are viewed in the axial direction of the impeller.

Abstract: A semiconductor integrated circuit in which multiphase clock signals having the same phase difference are supplied from a multi-stage differential ring oscillator to other circuits, the multiphase clock signals can be prevented from being degraded in waveform due to electrostatic coupling between wirings of the multiphase clock signals and also wired in as small an area as possible. The semiconductor integrated circuit includes: multiple stages of amplifier circuits, connected in a ring form, for performing oscillating operation; a logic circuit for performing logic operation on the basis of predetermined ones of output signals of the multiple stages of amplifier circuits to output a plurality of clock signals having different phases from each other and duties not equal to 0.5; and a plurality of wirings for transmitting the plurality of clock signals output from the logic circuit.

Abstract: A semiconductor integrated circuit in which, when leading out multiple-phase clock signal wirings from the ring oscillator circuit capable of oscillating at a high frequency, increase in the area of the substrate and deterioration in the clock phase accuracy caused by the non-uniform stray capacitances among the multiple-phase clock signal wirings are prevented. The semiconductor integrated circuit includes: N-stage amplifying circuits connected in a form of a ring to perform oscillating operation, which amplifying circuits are arranged in a semiconductor substrate to be divided into a plurality of rows, wherein in each row an amplifying circuit of “m?1”th stage and an amplifying circuit of “m”th stage are not adjacent to each other, where m is an arbitrary integer number within a range from 2 to N; and a plurality of wirings for respectively leading out a plurality of output signals from the amplifying circuits disposed in one of the plurality of rows.

Abstract: A phase-selective type frequency modulator capable of easing the restriction on a phase range of a modulated clock signal. The phase-selective type frequency modulator includes a multiphase clock signal generating circuit 101 for generating N-phase clock signals; a control circuit 104 for sequentially activating one of first group of clock selection signals indicating a clock signal to be selected from the N-phase clock signals; an edge appearance time adjustment circuit 103 for adjusting a rising edge appearance time and/or a trailing edge appearance time of the first group of clock selection signals outputted from the control circuit 104 to output second group of clock selection signals; and a modulated clock signal generating circuit 102 for selecting one clock signal from the N-phase clock signals in accordance with an activated state of the second group of clock selection signals outputted from the edge appearance time adjustment circuit 103 to output a modulated clock signal MCK.

Abstract: A phase-selective type frequency modulator capable of easing the restriction on a phase range of a modulated clock signal. The phase-selective type frequency modulator includes a multiphase clock signal generating circuit 101 for generating N-phase clock signals; a control circuit 104 for sequentially activating one of first group of clock selection signals indicating a clock signal to be selected from the N-phase clock signals; an edge appearance time adjustment circuit 103 for adjusting a rising edge appearance time and/or a trailing edge appearance time of the first group of clock selection signals outputted from the control circuit 104 to output second group of clock selection signals; and a modulated clock signal generating circuit 102 for selecting one clock signal from the N-phase clock signals in accordance with an activated state of the second group of clock selection signals outputted from the edge appearance time adjustment circuit 103 to output a modulated clock signal MCK.

Abstract: In a semiconductor integrated circuit including a phase comparison circuit for a DLL in a reception circuit for receiving serial digital transmission signals, phase detection characteristics of the phase comparison circuit are improved while preventing false lock so as to improve response speed and locking accuracy of the DLL as a whole.

Abstract: A semiconductor integrated circuit in which multiphase clock signals having the same phase difference are supplied from a multi-stage differential ring oscillator to other circuits, the multiphase clock signals can be prevented from being degraded in waveform due to electrostatic coupling between wirings of the multiphase clock signals and also wired in as small an area as possible. The semiconductor integrated circuit includes: multiple stages of amplifier circuits, connected in a ring form, for performing oscillating operation; a logic circuit for performing logic operation on the basis of predetermined ones of output signals of the multiple stages of amplifier circuits to output a plurality of clock signals having different phases from each other and duties not equal to 0.5; and a plurality of wirings for transmitting the plurality of clock signals output from the logic circuit.

Abstract: A semiconductor integrated circuit which realizes a reception circuit that can stably detect symbol values even in a case where, in the reception of serial transmission data, the serial transmission data has its phase shifted relative to the sampling clock signals or has its waveform degraded due to the deviation of the delay of a signal in a transmission line.

Abstract: A semiconductor integrated circuit in which, when leading out multiple-phase clock signal wirings from the ring oscillator circuit capable of oscillating at a high frequency, increase in the area of the substrate and deterioration in the clock phase accuracy caused by the non-uniform stray capacitances among the multiple-phase clock signal wirings are prevented. The semiconductor integrated circuit includes: N-stage amplifying circuits connected in a form of a ring to perform oscillating operation, which amplifying circuits are arranged in a semiconductor substrate to be divided into a plurality of rows, wherein in each row an amplifying circuit of “m−1”th stage and an amplifying circuit of “m”th stage are not adjacent to each other, where m is an arbitrary integer number within a range from 2 to N; and a plurality of wirings for respectively leading out a plurality of output signals from the amplifying circuits disposed in one of the plurality of rows.

Abstract: A semiconductor integrated circuit in which multiphase clock signals having the same phase difference are supplied from a multi-stage differential ring oscillator to other circuits, the multiphase clock signals can be prevented from being degraded in waveform due to electrostatic coupling between wirings of the multiphase clock signals and also wired in as small an area as possible. The semiconductor integrated circuit includes: multiple stages of amplifier circuits, connected in a ring form, for performing oscillating operation; a logic circuit for performing logic operation on the basis of predetermined ones of output signals of the multiple stages of amplifier circuits to output a plurality of clock signals having different phases from each other and duties not equal to 0.5; and a plurality of wirings for transmitting the plurality of clock signals output from the logic circuit.

Abstract: A semiconductor integrated circuit which realizes a reception circuit that can stably detect symbol values even in a case where, in the reception of serial transmission data, the serial transmission data has its phase shifted relative to the sampling clock signals or has its waveform degraded due to the deviation of the delay of a signal in a transmission line.