| 摘要 |
<p>PURPOSE:To miniaturize the stationary bar code reader and to improve the reading performance. CONSTITUTION:The stationary bar code reader is provided with a reading window 52 equipped on the upper surface of a box body 51, a tetraprism rotation scanning mirror 59 reflecting or scanning a laser beam from a laser oscillator 53 on the opposite side from the upper surface where the reading window 52 is equipped, that is, on the oblique low part, and four fixed scanning mirrors 60, 61, 62, and 63 reflecting the reflection beam from this rotation scanning mirror and generating four groups of laser beam scanning in the four directions toward the normal surface against the reading window surface to the outside direction from the reading window 52, that is, two groups of oblique scanning lines b1 and b2 and two groups of almost vertical scanning lines b3 and b4.</p> |
