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    • 5. 发明申请
    • MARKED CARD READER
    • 标记卡读卡器
    • WO98049648A1
    • 1998-11-05
    • PCT/US1998/007591
    • 1998-04-14
    • G05B19/12G05B19/14G06K7/10
    • G05B19/14G05B19/124G05B2219/23363G05B2219/23367G05B2219/23384G05B2219/2633
    • A marker card reader having a lensless optical detection system with fixed angle illumination and detection, the sensitivity of which is independent of the associated frequency response. The optical detection system (48) includes a radiation source (50) to produce radiation and a radiation detector (56). A target plane is positioned so that the radiation source directs radiation toward the target plane (66). The detection source is positioned to sense radiation reflected from the target plane. An optically opaque body (108) is positioned between the optical detector and the radiation source to prevent incident radiation from being sensed by the optical detector.
    • 具有固定角度照明和检测的无镜头光学检测系统的标记卡读取器,其灵敏度与相关的频率响应无关。 光学检测系统(48)包括产生辐射的辐射源(50)和辐射检测器(56)。 定位靶平面,使得辐射源将辐射引向目标平面(66)。 检测源被定位成感测从目标平面反射的辐射。 光学不透明体(108)位于光学检测器和辐射源之间,以防止被光学检测器感测入射的辐射。