×

System for automatically reading symbols, such as bar codes, on objects which are placed in the detection zone of a symbol reading unit, such as a bar code scanner

  • US 5,260,554 A
  • Filed: 10/31/1991
  • Issued: 11/09/1993
  • Est. Priority Date: 06/05/1991
  • Status: Expired due to Term
First Claim
Patent Images

1. Apparatus for reading a symbols on an object for obtaining information with respect thereto which comprises means for reading said symbols in response to the reflection of a beam of light emanating therefrom, means for detecting from a reflective area on a surface separate from or of the object on which area said beam is incident and from which said beam is reflected to present said symbol thereon in intercepting relationship with said beam, means for testing the presence of said reflective area on said surface separate from the object and of the object, said testing means including means for providing said beam in successive means including means for providing said beam in successive pulses of emanating light which are returned by said reflecting areas when reflected thereby, and means responses to the ratio of said pulses of emanating light to said return pulses of light for operating said reading means.

View all claims
  • 5 Assignments
Timeline View
Assignment View
    ×
    ×