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    • 29. 发明授权
    • Converter
    • 转换器
    • US5621620A
    • 1997-04-15
    • US526963
    • 1995-09-12
    • Haruhiko MachidaShinichi Tasaki
    • Haruhiko MachidaShinichi Tasaki
    • H02M3/155H03K3/354H03K4/54H02M3/337
    • H02M3/155
    • A converter for raising a weak input DC voltage of 0.3 volts or less to an output voltage has a blocking oscillator and a field-effect transistor included in the oscillator. The transistor having a base earthed is of the enhancement type activated by a gate-source voltage equal to or lower than the input, and the oscillator is activated responding to the gate-source voltage, so that pulses are generated as the output. Typically, the oscillator is composed of a resistor and a condenser connected in series through a lead and between an earth and an input line, a transformer whose secondary winding is connected to transistor's gate and the lead, with a primary winding being connected to the input line and the transistor's drain, and a diode earthed and having a cathode connected to the gate. An electromotive force induced through the secondary winding when the transistor is inactivated has positive and negative poles directed to the condenser and the gate, respectively.
    • 用于将输入电压为0.3V以下的弱输入直流电压升压的转换器具有包含在振荡器中的阻塞振荡器和场效应晶体管。 具有基极接地的晶体管是由等于或低于输入的栅极 - 源极电压激活的增强型,并且振荡器响应于栅极 - 源极电压被激活,使得产生脉冲作为输出。 通常,振荡器由电阻器和电容器组成,它们通过引线串联连接在地线和输入线之间,其次级绕组连接到晶体管的栅极和引线上,其中初级绕组连接到输入端 线路和晶体管的漏极,以及二极管接地并具有连接到栅极的阴极。 当晶体管失活时,通过次级绕组感应的电动势分别具有指向冷凝器和栅极的正极和负极。
    • 30. 发明授权
    • Optical reader with improved response to change in reflected signal
    • 光学读取器对反射信号变化的响应改善
    • US5506411A
    • 1996-04-09
    • US175247
    • 1993-12-29
    • Shinichi Tasaki
    • Shinichi Tasaki
    • G06K7/10
    • G06K7/10851
    • An optical reader, such as a bar code reader, includes improved circuitry to enable the bar code reader to respond more quickly and more accurately to signal variations due to changes in the ambient light condition and in the contrast presented by the information being read. In particular, the reader includes "slice" circuitry to sense the transitions of signals corresponding to the black-to-white and white-to-black edges of a bar code. The slice circuit includes two ideal diodes whose inputs are connected to an analog input terminal and whose outputs are respectively connected to first and second capacitors to sense and peak detect the values ofincreasing and decreasing signals. Two diodes are connected in series between the postive peak detector and the negative peak detector and the junction of the two series connected diodes functions as an output terminal at which is produced a reference voltage applied to a comparator. An analog signal, corresponding to the information being read, is applied to the slice circuit and to the comparator whose ouptut follows rapidly and faithfully the analog signal.
    • 诸如条形码读取器的光学读取器包括改进的电路,使得条形码读取器能够更快速和更准确地响应于由于环境光条件的改变以及正被读取的信息呈现的对比度而引起的变化。 特别地,读取器包括“切片”电路,用于感测对应于条形码的黑白和黑白边缘的信号的转变。 分片电路包括两个理想的二极管,其输入端连接到模拟输入端子,其输出分别连接到第一和第二电容器,以感测和峰值检测增加和减小信号的值。 两个二极管串连在寄存峰值检测器和负峰值检测器之间,并且两个串联连接的二极管的结点用作输出端子,在该输出端子处产生施加到比较器的参考电压。 对应于正在读取的信息的模拟信号被施加到片电路和比较器,其比较器迅速且忠实地跟随模拟信号。