light pen
柯林斯词典
1. N a rodlike device which, when applied to the screen of a cathode-ray tube, can detect the time of passage of the illuminated spot across that point thus enabling a computer to determine the position on the screen being pointed at 光源路径诊断系统
2. N a penlike device, used to read bar codes, that emits light and determines the intensity of that light as reflected from a small area of an adjacent surface (用以阅读条形码的)光笔
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light pen
剑桥词典
- a pen-shaped device used for reading bar codes
读码器,条形码扫描器 返回 light pen