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    • 31. 发明授权
    • Method and apparatus for driving a stepping motor
    • 用于驱动步进电机的方法和装置
    • US4959738A
    • 1990-09-25
    • US325978
    • 1989-03-20
    • Hiroshi FujiiShinji Katsuki
    • Hiroshi FujiiShinji Katsuki
    • H02P8/32G11B5/55H02P8/22
    • H02P8/22G11B5/553
    • In driving a stepping motor which, for example, is used to effect tracking movements of a head in an electronic still camera or other magnetic disk recording and/or reproducing apparatus, and which has a rotor and a plurality of phases to which input pulses are applied in predetermined sequences for establishing excitation states by which the rotor is stepped to respective positions, the input pulses are controlled for alternating between first and second excitation states corresponding to adjacent stepped positions between which it is desired to bring the rotor to rest. Such alternation is initially effected at a relatively low frequency so that the rotor oscillates between the stepped positions corresponding to the first and second excitation states, respectively, and then the frequency of alternation between the first and second excitation states is gradually increased to a value at which the rotor no longer oscillates with such alternation and comes to rest at a position between the stepped positions. A duty ratio is selected for the first and second excitation states which inversely corresponds to the ratio of the distances from the desired position of rest of the rotor to the stepped positions of the latter corresponding to the first and second excitation states, respectively, and such duty ratio is applied to the alternation between the first and second excitation states at least during the increasing of the frequency of alternation to the value at which the rotor no longer oscillates.
    • 32. 发明授权
    • Analog-to-digital converter of successive-approximation type
    • 逐次逼近型模数转换器
    • US4897658A
    • 1990-01-30
    • US170358
    • 1988-03-18
    • Hiroshi FujiiKenji KanemaruYoshinori FujihashiNobuyoshi Morita
    • Hiroshi FujiiKenji KanemaruYoshinori FujihashiNobuyoshi Morita
    • H03M1/38H03M1/46H03M1/68H03M1/76
    • H03M1/685H03M1/46H03M1/765
    • An analog-to-digital converter of the successive-approximation type has a successive-approximation logic circuit for successively generating selection signals defined by significant bits in a digital value, a string of high resistance elements to provide voltage dividers for successively dividing a reference voltage into divided voltages, a switch matrix circuit for generating the divided voltages when activated in response to the selection signals, a comparator for successively comparing an analog level with the divided voltages and for generating comparison signals respectively indicative of the significant bits and an output circuit for generating an output digital signal defined by the significant bits when applied with all the comparison signals, the output circuit being associated with the logic circuit for causing it to generate the selection signals in response to the comparison signals. A string of low resistance elements are provided to apply therethrough the reference voltage to at least one of the voltage dividers during a short period of time immediately after the one of the voltage dividers has been activated.
    • 逐次近似型的模数转换器具有逐次逼近逻辑电路,用于连续产生由数字值中的有效位定义的选择信号,一组高电阻元件,以提供分压器,用于连续分频参考电压 分压电路,用于响应于选择信号而被激活时产生分压的开关矩阵电路;比较器,用于连续地将模拟电平与分压电压进行比较,并产生分别表示有效位的比较信号和输出电路, 当应用所有比较信号时,产生由有效位定义的输出数字信号,输出电路与逻辑电路相关联,以使其响应于比较信号产生选择信号。 提供一串低电阻元件,用于在紧接在其中一个分压器被激活之后的短时间内将参考电压施加到至少一个分压器。