Browse Prior Art Database

Ultra Reliable Non-Contact Laser Wand with no Moving Parts

IP.com Disclosure Number: IPCOM000103042D
Original Publication Date: 1990-May-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 1 page(s) / 53K

Publishing Venue

IBM

Related People

Cato, RT: AUTHOR

Abstract

This article describes a "laser wand" that is a non-contact scanner like a laser gun, but has no moving parts like a wand. The laser guns available today have moving mirrors that scan the beam across the laser beam. Moving parts are much less reliable than non-moving parts. Wands have no moving parts, but need to contact the bar code.

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Ultra Reliable Non-Contact Laser Wand with no Moving Parts

      This article describes a "laser wand" that is a non-contact
scanner like a laser gun, but has no moving parts like a wand.  The
laser guns available today have moving mirrors that scan the beam
across the laser beam.  Moving parts are much less reliable than
non-moving parts.  Wands have no moving parts, but need to contact
the bar code.

      Solid-state lasers are much lighter and more reliable than
previous HeNe lasers.  Now it is possible to mount a solid-state
laser in a wand and do non-contact scanning. The operator would sweep
the beam across the label from a distance.  No moving parts would be
required in the wand itself.

      In order to meet the laser safety regulations concerning laser
emissions, especially for those for a stationary beam, two
accelerometers would be built into the wand.  Solid-state
accelerometers can be made from solid-state pressure sensors and a
mass.  The two accelerometers would sense acceleration in the two
directions that are both perpendicular to the laser beam. Thus, the
laser would turn on when the wand is being moved (accelerated)
quicker than a certain amount.

      Theoretically, the accelerometers do not know whether the
velocity is constant or zero.  However, in practicality it is
difficult for a human to move a wand at an exactly constant velocity.
The following things are done to prevent the laser from being on too
long if the wand is no...