light pen
noun [ C ] (also lightpen) uk/ˈlaɪt ˌpen/ us/ˈlaɪt ˌpen/
读码器，条形码扫描器
a pen-shaped device used for reading bar codes
You access the system simply by moving a light pen across the bar code.
- More examples
- Light pens are rarely seen these days, now that touchscreens and graphics tablets are widely available.
- The device came with a child-size mouse, a colour printer and a light pen for drawing.
- You can highlight one of the options by tapping the touchscreen or with the lightpen.
- Instead of using chalk or markers, students answer questions using light pens or hand-held clickers.