Patent ID: 7483194

Claim:
A module for an optical information reader in which at least a light emitting unit with a laser diode as a light source, a collimator lens, a vibration mirror for scanning, a condensing mirror or a condensing lens, and a light receiving unit are installed in a module casing for modularization, wherein a cylindrical lens assembly comprising a plurality of cylindrical lens pieces integrally joined is provided between said light emitting unit and said vibration mirror, wherein each of said plurality of cylindrical lens pieces has one face that forms a cylindrical concave surface having the same curvature and a different center position and another face that is a flat surface orthogonal to an optical axis, and wherein one of said plurality of cylindrical lens pieces is selected and inserted into a passing position of a laser beam generated by said light emitting unit to enable adjustment of an optical axis of the laser beam.