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Optical alignment between components in a head of a laser scanner is maintained in the event of external shock. Optical and scanning component assemblies are shock-mounted near their respective centers of mass. A flexible, printed circuit board on which the assemblies are mounted serves as an alignm

Optical alignment between components in a head of a laser scanner is maintained in the event of external shock. Optical and scanning component assemblies are shock-mounted near their respective centers of mass. A flexible, printed circuit board on which the assemblies are mounted serves as an alignment fixture.

대표청구항 ▼

In a laser scanning system for reading indicia having portions of different light reflectivity, said system being of the type including (A) a hand-held head normally supportable by a user in an intended position of use; (B) an optical assembly located in the head, having a center of mass, and includ

In a laser scanning system for reading indicia having portions of different light reflectivity, said system being of the type including (A) a hand-held head normally supportable by a user in an intended position of use; (B) an optical assembly located in the head, having a center of mass, and including (i) laser diode for emitting a laser beam with concomitant generation of heat, (ii) a heat sink for conducting the heat away from the diode, (iii) optic means for optically forming and modifying the laser beam to have a predetermined beam cross-section at a reference plane in the vicinity of which indicia to be read are located and impinged by the laser beam, thereby reflecting off the indicia reflected laser light, at least a returning portion of which travels away from the indicia back toward the head, and (iv) sensor means for detecting the returning portion of the reflected laser light, and for generating an electrical signal indicative of the indicia being read; and (C) a scanning assembly located in the head, having a center of mass, and including (i) a reciprocally oscillatable scanning motor having a drive shaft on which a mirror is mounted for joint repetitive and cyclical oscillating movement a plurality of times per second, said mirror directing the laser beam toward the reference plane and to and across the indicia to be read for scanning the same, said mirror also collecting the returning portion of the reflected laser light and directing the same to the sensor means, the improvement which comprises: (a) means for shock mounting the assemblies relative to the head, including (i) a first pair of shock mounts within the head and aligned along a first axis which extends generally through the center of the mass of the scaning assembly, and (ii) a second pair of shock mounts within the head and aligned along a second axis which extends generally through the center of mass of the optical assembly; and (b) a printed circuit board supported by, and extending between, the assemblies for maintaining the assemblies in optical alignment.