介绍了当前机床自动换刀技术的读码方法， 增强了换刀的可靠性，应用效果较为理想。
This article introduces reading-sign method on NC machine tools Auto-change tool, increase rehability of changing tool and the effect is better.
提出了一种采用单读码器件的串行编码绝对式光学编码器，介绍了其工作原理和基本结构。
The presented absolute optical encoder is based on a serial encoding method with single code detector. Its working principle and structure is described.
光学字符识别技术，它利用光敏感器件，是用来读码，商品标签，产品标签，信用卡收据及其他文件。
OCR technology, which uses a light sensitive device, is used to read codes on merchandise tags, product labels, credit card receipts, and other documents.
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