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    • 15. 发明授权
    • Thermal air flow meter
    • 热风流量计
    • US4911009A
    • 1990-03-27
    • US253576
    • 1988-10-05
    • Haruhiko MaedaTadao Suzuki
    • Haruhiko MaedaTadao Suzuki
    • G01F1/68G01F1/684G01F1/69
    • G01F1/6842G01F1/684G01F1/69
    • A thermal air flow meter for measuring the flow rate of intake air supplied to an internal combustion engine comprises a thermal sensor disposed in an intake air passage, a drive circuit including a circuit pattern formed on a circuit board for driving the thermal sensor, a shielding case having at least a bottom wall on which the circuit board is mounted and side walls, a through capacitor disposed on one of the side walls of the shielding case, a conductor extending through the capacitor so that the conductor is electrically connected in an AC mode through the capacitor to the shielding case and having one end connected to a corresponding terminal of the drive circuit and the other end connected to an external terminal, a metal case in which the shielding case is mounted and a connecting member electrically connecting the shielding case to the metal case at an area on the bottom wall selected between an edge of the bottom wall connected to the one side wall and an edge of the pattern formed on the circuit board closest to the one side wall, whereby the endurance electromagnetic compatability of the air flow meter is improved.
    • 18. 发明授权
    • Digital to analog converter
    • 数模转换器
    • US4573039A
    • 1986-02-25
    • US432845
    • 1982-10-05
    • Tadao SuzukiMiki Abe
    • Tadao SuzukiMiki Abe
    • H03M1/82G11B20/10H03M1/00H03M1/66H03K13/20
    • H03M1/662H03M1/68H03M1/82
    • A digital to analog converter for converting alternately supplied first and second channel digital data words to first and second channel analog output signals comprises a current producing circuit for selectively producing currents corresponding to the digital data words, respectively; first and second channel voltage producing circuits for producing the first and second channel analog output signals in response to the currents from the current producing circuit; and a switch disposed between the current producing circuits and the first and second channel voltage producing circuits for selectively supplying the current corresponding to the first channel digital data word to the first channel voltage producing circuit and the current corresponding to the second channel digital data word to the second channel voltage producing circuit.
    • 用于将交替提供的第一和第二通道数字数据字转换为第一和第二通道模拟输出信号的数模转换器包括分别用于选择性地产生对应于数字数据字的电流的电流产生电路; 第一和第二通道电压产生电路,用于响应于来自电流产生电路的电流产生第一和第二通道模拟输出信号; 以及设置在电流产生电路和第一和第二通道电压产生电路之间的开关,用于选择性地将对应于第一通道数字数据字的电流提供给第一通道电压产生电路和对应于第二通道数字数据字的电流 第二通道电压产生电路。