| 摘要 |
An apparatus and system that uses an improved photo detector in a laser scanner to scan bar codes. The photo detector has an increased signal to noise ratio, which improves the ability to detect faint reflected laser light. The signal to noise ratio is increased by reducing the thermal noise of the photo detector. The increased signal to noise ratio improves the laser bar code scanner's ability to read smaller bar codes as well as improving the read range of the scanner.
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