Patent ID: 6056200
Filing Date: 2000-05-02
Classification: G06K

Abstract:
A laser scan module adapted for use in a scanning system for reading bar code symbols having parts of different light reflectivity, said module comprising:a) a base;b) a semiconductor light source supported by the base, for generating a laser beam along a first optical path to a symbol to be read;c) a scanning component comprising a reciprocally oscillatable mirror located in said first optical path, for directing the laser beam impinging on the mirror to the symbol;d) a leaf spring supportably mounting the mirror for reciprocal oscillating movement;e) a permanent magnet operatively connected to the mirror, and an electromagnetic coil operative, when an alternating drive signal is applied to the coil, for producing an alternating magnetic field which acts on the permanent magnet and, in turn, flexes the leaf spring and reciprocates the mirror through an arc about an axis;f) a detector for detecting reflected laser light from the symbol and for generating an electrical signal corresponding to the parts of different light reflectivity of the symbol; andg) a pin being parallel to said axis and being fixedly connected to the mirror and located in a stationary opening which is larger than the pin radially of said axis, said pin being spaced away from an inner surface of the opening, and the pin and the opening together serving as a stop to limit radial displacement of the scanning component.