Wand turn-on control Patent #: 4072859
ApplicationNo. 05/902892 filed on 05/04/1978
US Classes:235/462.05, Means to read bar code on a transparent medium (e.g., film)235/455, Light level control250/568Digital information
ExaminersPrimary: Cook, Daryl W.
Attorney, Agent or Firm
International ClassesG06K 7/14 (20060101)
G06K 7/10 (20060101)
AbstractA method and apparatus for reading bar coded data for entry into portable data collection systems. The data is read by an optical wand wherein the light source is automatically and periodically energized for saving the energy of the system. The D.C. offset voltages are determined and stored in an up/down counter during reading or sampling intervals while the analog signal processing circuits are periodically de-energized. The light source is also calibrated to maximize the power savings and minimize reading errors.