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1. 发明授权

US4267439A Document reader lamp life extension system 失效
标题翻译：文件阅读器灯寿命延长系统
公开(公告)号：US4267439A
公开(公告)日：1981-05-12
申请号：US102663
申请日：1979-12-12
申请人： Robert J. Thomas , Michael Piekarski
发明人： Robert J. Thomas , Michael Piekarski
IPC分类号： G06K7/10 , G06K7/14
CPC分类号： G06K7/10851 , G06K2207/1018
摘要： An optical character reader for conversion of information to a machine readable code from a strip of alpha-numeric characters on the face of a document. It includes an elongated document slot along which the document may be hand guided through a predetermined path. Optical viewing means is provided across a scan line intersecting the path of the alpha-numeric characters. A character scanning assembly electronically generates images of each character. Recognition processing means encodes these images into a machine readable code. All of the physical, optical and electronic components are contained within a compact single enclosure. Incandescent lamps are utilized to illuminate the document face across the scan line. The usable life of each lamp is extended by providing a constant current source in the operational lamp circuit. Incandescent lamps are utilized to illuminate the face of the document across the scan line. Lamp life is extended by dimming of the lamps when they are nonoperational, maintaining the lamps in a state of excitation beyond the crystalline state of the material comprising the lamp filaments. A second form of lamp life extension is provided by interposing a constant current source in the electrical power supply connected to the lamps in their operational state.
摘要翻译：一种光学字符读取器，用于将信息从文档面上的字母数字字符条转换为机器可读代码。它包括一个细长的文件槽，文档沿着该文件槽可以手动引导通过预定的路径。在与字母数字字符的路径相交的扫描线上提供光学观察装置。字符扫描组件以电子方式生成每个字符的图像。识别处理装置将这些图像编码成机器可读代码。所有物理，光学和电子部件都包含在紧凑的单个外壳内。利用白炽灯照亮扫描线上的文件面。通过在操作灯电路中提供恒定电流源来延长每个灯的使用寿命。利用白炽灯照亮扫描线上文件的面部。当灯不工作时，通过调光灯来延长灯的寿命，保持灯处于超过包含灯丝的材料的结晶状态的激发状态。通过在其操作状态下连接到灯的电源中插入恒定电流源来提供第二种灯寿命延长。

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