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Scanning device
| Details |
Inventors: Peng, Ke-Ou;
Assignee: Opticon Sensors Europe B.V. (Hoofddorp, NL)
Primary Examiner: Dzierzynski; Paul M.
Assistant Examiner: Chang; Audrey Y.
Attorney, Agent or Firm: Young & Thompson
Scanning device for optically scanning symbol codes, such as bar codes, comprising a laser source for producing a scanning beam, a detector for detecting light backscattered by the scanned symbol codes, first and second rotatable deflection elements for both transmitting and deflecting the scanning beam so as to generate a scanning pattern, and drive devices for rotating the first and second deflection elements around a first and second axis of rotation, respectively, in which scanning device the scanning beam when impinging upon the first deflection element does not coincide with at least one of both axes of rotation. |
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DETAILED DESCRIPTION Therefore, it is an object of the present invention to provide a relatively simple scanning device that, while using rotating deflection means, can generate various multiple-directional scanning patterns.
To meet this object the scanning device as defined above is characterized in that the scanning beam when impinging upon the first deflection means does not coincide with at least one of both axes of rotation.
By the application of these measures the generated scanning pattern will loose its rotational symmetry.
However, it appears that the exact rotational symmetry is not important for most applications, such as bar code readers.
Moreover, surprisingly,if the shift of the scanning beam from either of both axes of rotation is small the resulting non-symmetry will also be very small.
The introduction of this non-symmetry offers great advantages in the actual design, because no complicated driving mechanism with two hollow shafts, one for every rotating deflection means each, e.
g.
wedges, is needed anymore.
Now, it is possible to use standard driving means for the rotating deflection means.
The deflection means may be triangular prisms.
In the scanning device according to the invention the scanning beam may impinge upon one of the first or second deflection means substantially along the first or second axis of rotation, respectively.
The driving means may comprise a first motor and a second motor, the first motor driving said first deflection means and the second motor driving said second deflection means, both said motors being connected to a synchronising/control unit, which controls the speed of rotation and the direction of rotation of both motors in order to generate a required scanning pattern.
These measures offer advantageous and flexible design possibilities for a scanning device according to the invention.
First of all, by controlling the speed of rotation and the direction of rotation relative to each other of the two deflection means the scanning pattern may be given a predetermined shape, depending on the actual application
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Optical Systems 
