Portable laser diode scanning head

  • US 5,545,889 A
  • Filed: 12/07/1993
  • Issued: 08/13/1996
  • Est. Priority Date: 02/28/1985
  • Status: Expired due to Term
First Claim
Patent Images

1. A laser scanning head for reading symbols comprising:

  • (a) an actuatable laser light source mounted in the head and operative, when actuated, for generating an incident laser beam;

    (b) a stationary folding mirror for reflecting the incident laser beam along a first optical path;

    (c) a movable scanning mirror positioned in the first optical path so as to reflect the incident laser beam directly to a reference plane located exteriorly of the head, and to a symbol located in a working distance range in the vicinity of the reference plane, thereby reflecting off the symbol reflected laser light, at least a returning portion of which travels along a second optical path away from the symbol directly back to the scanning mirror;

    (d) a stationary, curved collecting mirror having the folding mirror mounted in a central area thereof, the collecting mirror being larger than the folding mirror;

    (e) a scan drive means mounted in the head for moving the scanning mirror and for sweeping the incident laser beam in a scan across the symbol, the returning portion of the reflected laser light having a variable intensity over the scan;

    (f) a sensor mounted in the head for detecting the variable intensity of the returning portion of the reflected laser light over a field of view, and for generating an electrical analog signal indicative of the detected variable light intensity, the curved collecting mirror positioned to collect the returning portion of the reflected laser light over the field of view and to direct the collected returning portion to the sensor;

    (g) a signal processor mounted in the head for processing the analog electrical signal, and for generating a processed signal indicative of the symbol; and

    (h) a manually-actuatable trigger on the head and operatively connected to and operative for actuating, the scanning mirror, the laser light source, the scan drive means, the sensor, and the signal processor, to initiate a reading of the symbol upon manual actuation of the trigger by the user.

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