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    • 3. 发明授权
    • Thermal printer with print density control
    • 具有打印浓度控制的热敏打印机
    • US4442342A
    • 1984-04-10
    • US373681
    • 1982-04-30
    • Shigeo Yoneda
    • Shigeo Yoneda
    • B41J2/37B41J2/36H04N1/40H05B3/00
    • B41J2/36H04N1/40025
    • There is disclosed a print density control for use in a thermal printer, which control is responsive to variation in a supply voltage for assuring a uniform print density. The control includes a voltage-to-frequency converter for varying the frequency of an output signal in accordance with the amplitude of the supply voltage to the print head. An enabling voltage is applied to the print head until a count characteristic of the frequency of the output signal from the voltage-to-frequency converter reaches a predetermined value. By controlling the conduction duration of the print head in response to variations in the supply voltage, the thermal energy conveyed from the print head to a heat sensitive sheet is fixed to thereby assure uniform print density. In a preferred form, there are further provided a control circuit for permitting voltage supply to the print head until the count reaches the predetermined value and for varying the current conduction duration of the print head as a function of variations in the supply voltage to the print head. Accordingly, the strength of thermal energy being supplied to the print head is kept constant regardless of variations in the supply voltage to the print head.
    • 公开了一种在热敏打印机中使用的打印浓度控制,该控制响应供应电压的变化以确保均匀的打印浓度。 该控制包括电压 - 频率转换器,用于根据与打印头的电源电压的幅度来改变输出信号的频率。 向打印头施加使能电压,直到来自电压 - 频率转换器的输出信号的频率的计数特性达到预定值。 通过响应于电源电压的变化来控制打印头的传导持续时间,将从打印头传送到热敏纸的热能被固定,从而确保均匀的打印密度。 在优选形式中,还提供一种控制电路,用于允许对打印头的电压供应,直到计数达到预定值,并且根据对打印头的电源电压的变化来改变打印头的当前导通持续时间 头。 因此,供给打印头的热能的强度保持恒定,而与打印头的电源电压的变化无关。
    • 8. 发明授权
    • Manual scan type image reader for correcting read image data to
faithfully reproduce read image
    • 手动扫描型图像读取器,用于校正读取图像数据以忠实地再现读取图像
    • US5058188A
    • 1991-10-15
    • US609517
    • 1990-11-05
    • Shigeo Yoneda
    • Shigeo Yoneda
    • G06K7/10G06K9/22H04N1/047H04N1/107
    • G06K7/10881G06K9/228H04N1/047H04N1/107H04N1/1072H04N2201/04705H04N2201/04787
    • Thers is disclosed a manual scan type image reader for reading a document image by manually moving an image sensor for optically reading the image in a predetermined manual scan direction, converting the read document image into document image data, and outputting the converted document image data to an external unit. In the image reader, there is provided a ruler body including an image reading window for seeing the image therethrough formed on a bottom surface thereof so as to be opened to a top surface thereof, and plural scale lines printed with predetermined equal pitches in the manual scan direction on a bottom surface thereof. A scanner is mounted on the ruler body for movement in the manual scan direction, and the scanner includes the image sensor for reading the document image and the plural scale lines and converting them into document image data and scale image data, respectively. An image reading controller of the image reader corrects the document image data converted by the image sensor according to the scale image data converted by the image sensor so as to reproduce further document image data corresponding to the document image with predetermined equal pitches between the adjacent scale lines of the converted scale image data.
    • 公开了一种手动扫描型图像读取器,用于通过手动移动用于以预定的手动扫描方向光学读取图像的图像传感器来读取文档图像,将读取的文档图像转换为文档图像数据,并将转换的文档图像数据输出到 外部单元。 在图像读取器中,提供了一个标尺体,其包括用于在其底表面上形成的图像的图像读取窗口,以便在其顶表面上打开,并且在手册中以预定的等间距印刷多个刻度线 扫描方向。 扫描仪安装在标尺主体上,用于在手动扫描方向上移动,扫描仪包括用于读取文档图像和多个刻度线的图像传感器,并将它们转换为文档图像数据和缩放图像数据。 图像读取器的图像读取控制器根据由图像传感器转换的比例图像数据来校正由图像传感器转换的文档图像数据,以便在相邻尺度之间以预定的等间距再现与文档图像相对应的另外的文档图像数据 转换的缩放图像数据的行。