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US 5,705,799 AGranted
Miniature optical scanning assembly for barcode readers
AssigneeSymbol Technologies, Inc.
InventorYajun Li
Life of this patent
Estimating the term…
Abstract
An optical scanning assembly turns an optical element in opposite circumferential directions about a longitudinal axis along which a light beam from a light source is emitted. The optical element and the light source are mounted on individual supports between which torsion elements are connected. An electrical coil arrangement interacts with a permanent magnet to effect the turning movement.
Claims20
An optical scanning assembly, comprising:
- a housing;
- a source within said housing for emitting a light beam along a longitudinal axis to be reflected from a symbol to be scanned;
- a photodetector positioned within said housing for receiving light reflected from said symbol and responsively producing an electrical signal;
- an optical element positioned within the housing in a path of said light beam;
- a permanent magnet mounted to a support member and producing a magnetic field;
- an electric coil mounted with said optical element and axially displaced from said support member;
- and
- a plurality of semi-rigid electrically conducting wires interconnecting said coil and said support member such that AC drive current applied to said coil through said wires causes said coil to generate an electromagnetic field for interaction with the magnetic field of said permanent magnet to produce oscillatory motions of said optical element in opposite circumferential directions about said longitudinal axis.
5 more elements
An optical scanning assembly, comprising:
- a) a pair of supports spaced apart along a longitudinal axis;
- b) a light source on one of the supports for emitting a light beam along the longitudinal axis;
- c) a permanent magnet on said one support for generating a permanent magnetic field between the supports;
- d) an optical element on the other of the supports in the path of the light beam, for optically modifying the light beam;
- and
- e) a drive for turning at least one of the optical element and the light source in opposite circumferential directions about the longitudinal axis, including an energizeable electrical coil arrangement on said other support for generating an electromagnetic field between the supports for interaction with said permanent magnetic field.
3 more elements
Dependencies are inferred from the claim text.