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    • 86. 发明授权
    • Patch density measuring apparatus and image forming apparatus
    • 贴片密度测定装置及成像装置
    • US07194214B2
    • 2007-03-20
    • US11039828
    • 2005-01-24
    • Osamu Takahashi
    • Osamu Takahashi
    • G03G15/00
    • G03G15/5058G03G15/5041G03G2215/0164
    • When a regular reflection light receiving unit is receiving a reflected light in a non-image area where the test patches are not formed, a clamp switch is closed. Then, a first reference voltage generated by a pull-up resistor and a zener diode is corresponded to an electric potential of a terminal of a capacitor on the side of an A/D converter. The capacitor is charged by the difference in electric potential between the first reference voltage and an output voltage from the regular reflection light receiving unit. Next, the clamp switch is opened. After the regular reflection light receiving unit receives the reflected light from an image area where the test patches are formed with this state of things, the output voltage from the regular reflection light receiving unit is changed. The difference in density between the image area and the non-image area can be quantified by the A/D converter.
    • 当正反射光接收单元在未形成测试片的非图像区域中接收到反射光时,闭合开关。 然后,由上拉电阻和齐纳二极管产生的第一参考电压对应于A / D转换器一侧的电容器的端子的电位。 电容器由第一参考电压和来自正反射光接收单元的输出电压之间的电位差来充电。 接下来,夹紧开关打开。 在正常反射光接收单元接收到来自具有这种状态的测试贴片的图像区域的反射光之后,来自正反射光接收单元的输出电压被改变。 图像区域和非图像区域之间的密度差可以通过A / D转换器来量化。