发明授权
US07224538B2 Electro-optical reader with improved laser intensity modulation over extended working range 有权
电光读取器,在延长的工作范围内具有改善的激光强度调制

Electro-optical reader with improved laser intensity modulation over extended working range
摘要:
The combination of a rooftop optical element and a soft edge aperture stop, as well as the introduction of a negative spherical aberration in a positive focusing lens, improve working distance and depth of focus in both moving beam and imaging readers for electro-optically reading indicia such as bar code symbols, especially for close-in symbols, and moreover tend to reduce undesirable light intensity modulation in the beam profile thereby improving reader performance.
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