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    • 2. 发明授权
    • Switched capacitor circuit
    • US06683514B2
    • 2004-01-27
    • US10207177
    • 2002-07-30
    • Yoshihisa Fujimoto
    • Yoshihisa Fujimoto
    • H03H700
    • H03H19/004
    • A non-inverting-side first switch is formed in a first area on one of sides of a differential amplifier, meanwhile a non-inverting-side second switch is formed in a second area on the other of sides of the differential amplifier, the non-inverting switches being for resetting a non-inverting input terminal of the differential amplifier. Similarly, An inverting-side first switch is formed in the first area, meanwhile an inverting-side second switch is formed in the second area, the inverting switches being for resetting a non-inverting input terminal of the differential amplifier. Further, a non-inverting-side line connecting the non-inverting-side first switch and the non-inverting input terminal, and an inverting-side line connecting the inverting-side first switch and the inverting-side second switch are provided next to each other. A signal line crossing one of the lines is provided so as to cross the other of the lines. This causes interferences from the signal line onto the lines to cancel out each other. As a result, it is possible to realize a switched capacitor circuit capable of attaining improvement in operational accuracy and low electric power consumption or high-speed operation.
    • 3. 发明授权
    • Sample-and-hold amplifier circuit and pipelined A/D and D/A converters using sample hold amplification circuit
    • 采样保持放大器电路和流水线A / D和D / A转换器使用采样保持放大电路
    • US06608504B2
    • 2003-08-19
    • US09932025
    • 2001-08-20
    • Yoshihisa Fujimoto
    • Yoshihisa Fujimoto
    • G11C2702
    • H03M1/442G11C27/026H03F3/45977H03K5/2481H03K5/249
    • A sample-and-hold amplifier circuit has a switch, provided between an operational amplifier stage and an inverting amplifier stage, for connecting or cutting off the connection of the operational amplifier stage and the inverting amplifier stage. During the first operation phase (&phgr;1), the first and second switches are switched to the &phgr;1 side, the third switch is conductive, and the switch for connecting or cutting off the connection is nonconductive. Thus, sampling can be carried out so that first and second capacitors are charged by predetermined electrical charges. During the second operation phase (&phgr;2), the first and second switches are switched to the (&phgr;2 side, the third switch is nonconductive, and the switch for connecting or cutting off the connection is conductive.
    • 采样和保持放大器电路具有设置在运算放大器级和反相放大级之间的开关,用于连接或切断运算放大器级和反相放大器级的连接。 在第一操作阶段(phi1)期间,第一和第二开关切换到phi1侧,第三开关导通,用于连接或切断连接的开关不导通。 因此,可以进行采样,使得第一和第二电容器被预定的电荷充电。 在第二操作阶段(phi2)期间,第一和第二开关切换到(phi2侧,第三开关不导通,用于连接或切断连接的开关是导电的。
    • 4. 发明申请
    • Fixing device and image forming apparatus
    • 固定装置和成像装置
    • US20070170172A1
    • 2007-07-26
    • US11589857
    • 2006-10-31
    • Yutaka OtsukaYoshihisa FujimotoKoji TakahashiNaoki Yamamoto
    • Yutaka OtsukaYoshihisa FujimotoKoji TakahashiNaoki Yamamoto
    • G03G15/20H05B6/14
    • H05B6/145G03G15/2003
    • A Fixing device has a heat roller, a magnetic flux generating element, and a magnetic flux block section. The magnetic flux block section for blocking magnetic flux flowing from a magnetic flux generating element to a heat roller is moved to a position at which the magnetic flux does not cause the heat roller to generate heat when rotation of the heat roller stops. The magnetic flux block section is moved to a position at which the heat roller generates heat when the heat roller rotates. Therefore, when rotation of the heat roller stops, even if electric current is applied to the magnetic flux generating element to generate magnetic flux from the magnetic flux generating element, heat generation by the magnetic flux generating element is prevented, so that smoking and firing of the heating element is suppressed.
    • A固定装置具有加热辊,磁通量产生元件和磁通量块部。 用于阻止从磁通量产生元件流到加热辊的磁通量的磁通块部分移动到当热辊停止转动时磁通量不会导致热辊产生热量的位置。 当加热辊旋转时,磁通量块部移动到加热辊产生热量的位置。 因此,当加热辊的旋转停止时,即使向磁通产生元件施加电流以从磁通量产生元件产生磁通量,也防止了由磁通量产生元件产生的热量,从而吸烟和烧制 加热元件被抑制。
    • 6. 发明授权
    • Mixer
    • 混合器
    • US07483684B2
    • 2009-01-27
    • US11338673
    • 2006-01-25
    • Pascal LoreYoshihisa FujimotoMasayuki Miyamoto
    • Pascal LoreYoshihisa FujimotoMasayuki Miyamoto
    • H04B1/18
    • H03D7/1441H03D7/1483H03D2200/0033
    • To realize a mixer with a charge subsampling circuit with which a base band signal can be readily obtained without being affected by noise from wide bandwidth signals or undesired signals. A current generating circuit 8 outputs a current in proportion to the input signal voltage. In response to a control signal from the timing generating block 6, a charge subsampling circuit 7 samples the current at the same sampling frequency as the carrier frequency. In a charge-integrating process accompanying the sampling, weighting is carried out on terms in the transfer function of the FIR filter using a set of selected weights.
    • 实现具有充电子采样电路的混频器,可以容易地获得基带信号而不受来自宽带宽信号或不期望信号的噪声的影响。 电流产生电路8输出与输入信号电压成比例的电流。 响应于来自定时产生块6的控制信号,电荷子采样电路7以与载波频率相同的采样频率对电流进行采样。 在伴随采样的电荷积分过程中,使用一组选定的权重对FIR滤波器的传递函数中的术语进行加权。
    • 7. 发明授权
    • AD converter
    • AD转换器
    • US07439889B2
    • 2008-10-21
    • US11485330
    • 2006-07-13
    • Yoshihisa Fujimoto
    • Yoshihisa Fujimoto
    • H03M3/00
    • H03M3/37H03M1/0836H03M1/167H03M3/416H03M3/424H03M3/456
    • The ΔΣ AD converter includes: a sampling section for sampling an input signal at each cycle Ts; an AD conversion section for performing AD conversion of the input signal; a DA conversion section for performing DA conversion of an output of the AD conversion section; and a loop filter for integrating a difference obtained by subtracting an output of the DA conversion section from an output of the sampling section so as to output the integrated difference to the AD conversion section, wherein the sampling section includes two sampling circuits disposed parallel to each other, and the two sampling circuits respectively operate at timings different from each other, and each of the sampling circuits delays the input signal so as to output the delayed input signal.
    • DeltaSigma AD转换器包括:用于在每个周期Ts对采样输入信号的采样部分; AD转换部分,用于对输入信号进行AD转换; DA转换部分,用于执行AD转换部分的输出的DA转换; 以及环路滤波器,用于将通过从采样部分的输出中减去DA转换部分的输出而获得的差值积分,以将积分差分输出到AD转换部分,其中采样部分包括两个并行设置的采样电路 另外,两个采样电路分别在彼此不同的定时运行,并且每个采样电路延迟输入信号以输出延迟的输入信号。
    • 9. 发明授权
    • Fixing device
    • 固定装置
    • US08369730B2
    • 2013-02-05
    • US12037772
    • 2008-02-26
    • Yoshihisa Fujimoto
    • Yoshihisa Fujimoto
    • G03G15/20
    • G03G15/50G03G15/2039
    • A fixing device has a heating rotor, a pressure belt, a sheet member, first and second pressurizing members, a motor and a control unit. The control unit controls the motor to rotate the heating rotor and the pressure belt in a direction opposite to a conveyance direction of a recording material at startup time after jam treatment of the recording material. Contact positions of the sheet member with respect to the first and second pressurizing members are changed, so that the sheet member is prevented from obstructing independent actions of each of the first and second pressurizing members, which allows the nip portion N to maintain proper nip width and proper nip pressure. Thus, the fixing device has excellent stability at the nip portion to improve fixability and conveyability of the recording material with a simple construction.
    • 定影装置具有加热转子,加压带,片状部件,第一和第二加压部件,马达和控制部。 在记录材料的卡纸处理之后,控制单元控制电动机使加热转子和压力带在启动时沿与记录材料的输送方向相反的方向旋转。 板件相对于第一和第二加压构件的接触位置被改变,从而防止片状构件妨碍第一和第二加压构件中的每一个的独立作用,这允许夹持部分N保持适当的夹紧宽度 和适当的压区压力。 因此,定影装置在咬合部处具有优异的稳定性,以简单的结构提高记录材料的定影性和输送性。
    • 10. 发明授权
    • Delta-sigma modulator and its application to switching amplification circuit
    • Delta-Σ调制器及其在开关放大电路中的应用
    • US07248193B2
    • 2007-07-24
    • US11354916
    • 2006-02-16
    • Yoshihisa Fujimoto
    • Yoshihisa Fujimoto
    • H03M3/00
    • H03M3/366H03M3/43H03M3/448H03M3/452H03M3/506
    • A loop delay control circuit is provided between a comparator and a power switch stage. When the amplitude of an input signal is especially high, the loop delay control circuit secures an oscillation threshold value by setting a delay amount at a low value. On the other hand, when the amplitude of the input signal is not so high, the loop delay control circuit reduces an average switching rate by increasing the delay amount, but does not reduce the oscillation threshold value. This makes it possible to provide a delta-sigma modulator allowing realization of both (i) a high oscillation threshold value, i.e., high output power, and (ii) high power efficiency.
    • 在比较器和功率开关级之间设置环路延迟控制电路。 当输入信号的振幅特别高时,环路延迟控制电路通过将延迟量设定为低值来确保振荡阈值。 另一方面,当输入信号的振幅不高时,环路延迟控制电路通过增加延迟量来降低平均切换速率,但不降低振荡阈值。 这使得可以提供一种Δ-Σ调制器,允许实现(i)高振荡阈值,即高输出功率,和(ii)高功率效率。