LASER DIODE SCANNER WITH ENHANCED VISIBILITY OVER EXTENDED WORKING DISTANCE

摘要

The visibility of a laser beam emitted by a laser diode in a scanner is enhanced to facilitate aiming the laser beam at a symbol to be read. An aperture stop in an optical train is increased in dimension along a non-scan direction. The magnification of a focusing lens in the optical train is increased. Laser diode astigmatism is affirmatively used to enhance visibility.