Arrangement for generating asymmetrical green laser beam
AssigneeSymbol Technologies, Inc.
InventorYajun Li
Life of this patent
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Abstract
A green laser beam is generated and is focused and shaped with an asymmetrical beam cross-section in an electro-optical reader for reading indicia. The green laser beam is also used to illuminate an aiming spot or pattern on the indicia prior to reading.
Claims17
In a reader for electro-optically reading indicia, an arrangement for generating and directing a light beam of high visibility toward the indicia to be electro-optically read, the arrangement comprising:
- a laser for generating the light beam as a green laser beam having a wavelength in a range from about 500 nm to about 550 nm, and for directing the green laser beam along a path toward the indicia, the laser including a nonlinear optical crystal compound having an asymmetrical cross-section with unequal length and width dimensions as considered in a transverse plane perpendicular to the path to produce the green laser beam with an asymmetrical beam cross-section as considered in the transverse plane, the length dimension divided by the width dimension constituting an aspect ratio proportional to the asymmetrical beam cross-section.
In a method of electro-optically reading indicia, a method of generating and directing a light beam of high visibility toward the indicia to be electro-optically read, the method comprising the steps of:
- generating the light beam as a green laser beam having a wavelength in a range from about 500 nm to about 550 nm, and directing the green laser beam along a path toward the indicia, the laser beam being generated from a nonlinear optical crystal compound having an asymmetrical with unequal length and width dimensions as considered in a transverse plane perpendicular to the path to produce the green laser beam with an asymmetrical beam cross-section as considered in the transverse plane, the length dimension divided by the width dimension constituting an aspect ratio proportional to the asymmetrical beam cross-section.
An arrangement for generating a light beam of high visibility, the arrangement comprising:
- a laser for generating the light beam as a green laser beam having a wavelength in a range from about 500 nm to about 550 nm, the laser including a nonlinear optical crystal compound having an asymmetrical cross-section with unequal length and width dimensions as considered in a transverse plane perpendicular to the path to produce the green laser beam with an asymmetrical beam cross-section as considered in the transverse plane, the length dimension divided by the width dimension constituting an aspect ratio proportional to the asymmetrical beam cross-section.
Dependencies are inferred from the claim text.