摘要:
A diaphragm 46 is sandwiched between a first body 16 and a second body 18, and comprises an outer diaphragm 50 which is made of synthetic resin and has an opening 48 formed within an effective diameter X, and an inner diaphragm 52 arranged in the opening 48. The outer and inner diaphragms 50 and 52 are hermetically sealed by a coupling member 54 made of rubber. Therefore, the diaphragm 46 reciprocates as a synthetic resin diaphragm at very low temperatures. At normal temperatures, the inner diaphragm 52 reciprocates extensively via the rubber coupling member 54 compared with the outer diaphragm 50, thereby increasing a flow rate of the fuel pump compared with a fuel pump in which a diaphragm is made only of synthetic resin. When the diaphragm 46 is replaced depending upon a desired flow rate, the second body 18 can be manufactured using one die, which is effective in reducing manufacturing costs.
摘要:
A fuel pump which has excellent heat resistance and salt resistance, is low in cost and light in weight, and which is free from fuel leakage. The fuel pump has a bottom body formed of a thermosetting resin such as bakelite material which has heat resistance and strength, and a top body and a cover formed of a thermoplastic resin. The top body and the cover 16 are assembled with a seal member such as a gasket held between the top body and the cover, and the top body and the bottom body 12 are fixed together by a fixing element. Thereby, the main body portions of the fuel pump are constituted of resin.
摘要:
A multi-strobe circuit that latches a signal to be tested, an evaluation target, at each edge timing of a multi-strobe signal having a plurality of edges. An oscillator oscillates at a predetermined frequency in synchronization with a reference strobe signal. A latch circuit latches the signal to be tested at an edge timing of an output signal of the oscillator. A gate circuit is provided between a clock terminal of the latch circuit and the oscillator, and makes the output signal of the oscillator pass therethrough for a predetermined period. A clock transfer circuit loads the output signal of the latch circuit at an edge timing of the output signal of the oscillator and performs retiming on the output signal of the latch circuit by using a reference clock.
摘要:
There is provided an electric circuit that outputs a timing signal and a recovered clock. The electric circuit includes a delay circuit that delays a reference signal, a PLL section that delays an oscillation signal synchronized with the delayed reference signal by an offset delay amount to output the delayed oscillation signal when outputting the timing signal and changes a delay amount for the oscillation signal in a tracking range using the offset delay amount as a standard to output the oscillation signal in synchronization with a periodic signal when outputting the recovered clock, a delay amount separating section that separates a coarse component of an integral multiple of a period of the clock signal and a fine component less than the period of the clock signal from a system timing, and a delay setting section that sets a value obtained by subtracting an adjusted delay amount, which is an integral multiple of the period of the clock signal, from the coarse component as the delay amount of the delay circuit and sets a value obtained by adding the adjusted delay amount to the fine component as the offset delay amount if the tracking range in a negative direction is larger than the fine component.
摘要:
A multi-strobe circuit that latches a signal to be tested, an evaluation target, at each edge timing of a multi-strobe signal having a plurality of edges. An oscillator oscillates at a predetermined frequency in synchronization with a reference strobe signal. A latch circuit latches the signal to be tested at an edge timing of an output signal of the oscillator. A gate circuit is provided between a clock terminal of the latch circuit and the oscillator, and makes the output signal of the oscillator pass therethrough for a predetermined period. A clock transfer circuit loads the output signal of the latch circuit at an edge timing of the output signal of the oscillator and performs retiming on the output signal of the latch circuit by using a reference clock.
摘要:
There is provided a test apparatus that tests a device under test including a plurality of data terminals and a clock output terminal, the test apparatus including a plurality of first variable delay circuits that delays a reference clock, a plurality of timing clock generating sections that outputs a timing clock having a phase obtained by shifting a phase of the delayed reference clock by a designated phase shift amount, a timing comparator that acquires a data signal in accordance with the timing clock, a plurality of second variable delay circuits that delays the timing clock, a plurality of phase comparators that outputs a phase shift amount according to a phase difference between a clock signal and the timing clock, a first adjusting section that adjusts a delay amount of the first variable delay circuit so that the timing comparator acquires a data signal based on the timing clock, and a second adjusting section that adjusts a delay amount of the second variable delay circuit so that the timing comparator acquires the data signal based on the clock signal.
摘要:
The present invention provides a valve apparatus which is small and reasonably priced, and with which a fuel amount can be regulated by restricting the lift amount of a valve. A columnar portion 60 is formed in a body 16, the columnar portion 60 is inserted into a valve 44, 46 and a washer 62 formed with a protruding portion 72 which protrudes outward from a flange portion 64, and the check valve 44, 46 and washer 62 are attached or fixed to the pump body 16 by subjecting the tip end of the columnar portion 60 to thermal caulking or the like. The outer diameter of the protruding portion 72 is set to be relatively smaller than the outer diameter of the flange portion 64 such that when the check valve 44, 46 is sandwiched between the protruding portion 72 and pump body 16, the check valve 44, 46 contacts an outer peripheral edge 70 of the flange portion 64 when the check valve 44, 46 opens. As a result, the lift amount of the valve 44, 46 can be restricted, and the flow rate of the fuel passing through a passage 40, 42 can be maintained at a constant level.
摘要:
There is provided an electric circuit that outputs a timing signal and a recovered clock. The electric circuit includes a delay circuit that delays a reference signal, a PLL section that delays an oscillation signal synchronized with the delayed reference signal by an offset delay amount to output the delayed oscillation signal when outputting the timing signal and changes a delay amount for the oscillation signal in a tracking range using the offset delay amount as a standard to output the oscillation signal in synchronization with a periodic signal when outputting the recovered clock, a delay amount separating section that separates a coarse component of an integral multiple of a period of the clock signal and a fine component less than the period of the clock signal from a system timing, and a delay setting section that sets a value obtained by subtracting an adjusted delay amount, which is an integral multiple of the period of the clock signal, from the coarse component as the delay amount of the delay circuit and sets a value obtained by adding the adjusted delay amount to the fine component as the offset delay amount if the tracking range in a negative direction is larger than the fine component.
摘要:
There is provided a test apparatus that tests a device under test including a plurality of data terminals and a clock output terminal, the test apparatus including a plurality of first variable delay circuits that delays a reference clock, a plurality of timing clock generating sections that outputs a timing clock having a phase obtained by shifting a phase of the delayed reference clock by a designated phase shift amount, a timing comparator that acquires a data signal in accordance with the timing clock, a plurality of second variable delay circuits that delays the timing clock, a plurality of phase comparators that outputs a phase shift amount according to a phase difference between a clock signal and the timing clock, a first adjusting section that adjusts a delay amount of the first variable delay circuit so that the timing comparator acquires a data signal based on the timing clock, and a second adjusting section that adjusts a delay amount of the second variable delay circuit so that the timing comparator acquires the data signal based on the clock signal.
摘要:
A timing generation circuit can increase a maximum delay amount without changing the configuration of a timing memory. The timing generation circuit includes: a timing memory (TMM) 10 containing predetermined timing data; a plurality of down counters 20 for loading the timing data from the TMM and outputting a pulse signal at the timing indicated by the timing data; an address selection circuit 40 for specifying one or two TMM addresses by switching and outputting corresponding one or plural timing data; a load data switching circuit 50 for loading the plural timing data to the plural down counters cascaded and outputting one timing pulse signal; and a timing data selection circuit 60 for selecting one of the pulse signals. The plural timing data are generated by dividing the timing memory into a plurality of memory regions either in a column or row direction.