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Helical scanning pattern generator
| Details |
Inventors: Peng, Ke-Ou;
Assignee: Opticon Sensors Europe B.V. (Hoofddorp, NL)
Primary Examiner: Pitts; Harold
Assistant Examiner:
Attorney, Agent or Firm: Young & Thompson
Scanning apparatus to scan an object by means of a light beam, including at least one mirror (2), which, during operation, is driven by a drive to make a combined movement of a continuous rotation around an axis of rotation (63) and an oscillating movement relative to the axis of rotation (63), the drive including a rotation drive (7, 8) and an oscillating drive (11, 12), both drives being controlled in such a way that the continuous rotation and the oscillating movement of the mirror are controlled independently. Thus the oscillating drive oscillates only the mirror. The light beam is thus parallel to or coincident with the axis of rotation. |
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DETAILED DESCRIPTION It is a primary object of the present invention to provide a scanning apparatus able to provide at least segments of a helical scanning pattern, in which the pitch of the pattern may be varied, in order to read codes at the inside of hollow cylindrical objects.
It is a further object of the present invention to provide a scanning apparatus by which bar codes can be read located at an arbitrary position and having an arbitrary orientation with respect to the scanning apparatus.
Therefore, the invention is directed to a scanning apparatus as defined above wherein the driving means comprises rotation driving means and oscillating driving means, both driving means being controlled by control means in such a way that the continuous rotation and oscillating movement of the mirror are controlled independently.
By these measures the light beam after being reflected by the rotatable and tiltable mirror is able to generate at least segments of a helical scanning pattern, the pitch of which being variable by varying the mutual ratio between rotation speed of the mirror and oscillating speed of the mirror.
For instance, bar codes at the inside of hollow cylindrical objects are easy to read by such a scanning apparatus, since always one scanning line can be made to pass the entire code.
In a first embodiment of the invention, during operation, the light beam incident upon the mirror propagates substantially along the axis of rotation of the mirror.
By the application of this measure a continuous helical scanning pattern may be generated, thus enhancing the change of detecting the code to be read.
In a second embodiment of the invention the scanning apparatus comprises a rotatable polygon having N tiltable, reflective facets and wherein, during operation, the light beam incident upon subsequent facets of the polygon propagates along a path substantially parallel to the axis of rotation of the polygon.
By means of such a polygon segments of a helical scanning pattern may be generated, the pitch of which being variable by varying the mutual ration between the rotation speed of the polygon and the oscillating speed of the individual facets
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Optical Systems 
