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Scanning device for symbol codes
| Details |
Inventors: Peng, Ke-Ou;
Assignee: Opticon Sensors Europe B.V. (Hoofddorp, NL)
Primary Examiner: Pitts; Harold
Assistant Examiner:
Attorney, Agent or Firm: Parmelee, Bollinger & Bramblett
Scanning device for optically scanning symbol codes, such as bar codes, the device comprising a laser source for producing a scanning beam, a first lens for focussing the scanning beam, a detector for detecting light backscattered by the scanned symbol codes, a second lens for focussing the backscattered light onto the detector, first and second rotatable deflection means for both transmitting and deflecting the scanning beam so as to generate a scanning pattern, and drive means for rotating the deflection means, wherein both the first and the second deflection means comprise triangular prisms. |
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DETAILED DESCRIPTION The object of the invention is therefore to provide another and compact device for optically scanning symbol codes, said device being provided with simple and relatively inexpensive deflection means which have, in practice, an excellent efficiency.
Another object of the invention is to provide suitable drive means for such a scanner, the drive means enabling a compact structure of the scanner.
In order to meet these objects, the scanning device according to the invention is characterized in that both deflection means comprise triangular prisms.
Such prisms are easy to manufacture and are therefore relatively inexpensive.
In addition, a combination of two rotating prisms makes it possible to obtain a large variety of scanning patterns by, for example, using different rotation speeds and/or different prism angles and/or different refractive indexes.
Although various practical scanning patterns can be obtained by using prisms rotating in the same direction, a preferred embodiment of the invention is characterized in that the prisms have opposite directions of rotation.
Such an embodiment allows a plurality of advantageous scanning patterns to be produced, i.
e.
scanning patterns with which symbol codes, such as bar codes, can be scanned effectively.
In principle, the prism angle, that is to say the angle between the entry face and the exit face of each prism, can have a wide variety of values.
According to the invention, a scanning device which has a compact structure and which generates the desired scanning patterns can preferably be produced by using prisms whose prism angle is less than 15.
degree.
.
Suitable values are, for example, 6.
degree.
, 8.
degree.
and 10.
degree.
.
As a result of this small angle, the prisms can be relatively thin and their weight is consequently low.
This is especially important for scanning devices which are held in the hand when in use.
A further advantage of the use of said prisms is their flexibility in forming a high-density scanning pattern with a limited directional angle
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