Bar code scanner interface
Patent 4356389 Issued on October 26, 1982. Estimated Expiration Date: 
June 27, 2000. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 27, 2000. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3225213 3909594 3925639 Bar code scanner Optical bar code scanning device Power limiting circuit for bar code reader Patent #: 4240064 InventorsApplicationNo. 06/163855 filed on 06/27/1980US Classes:235/455, Light level control382/273Based on peak levelsExaminersPrimary: Robinson, Mark A.Attorney, Agent or FirmInternational ClassesG06K 7/10 (20060101)G06K 7/14 (20060101) AbstractThe positive and negative peak detectors in the interface are reset during each input signal cycle and the reference level used for comparison is switched from one level to another to improve decoding accuracy, with each level determined by the previous two peaks. The input signal is DC coupled and DC offset. The scanner light source is pulsed by a low duty cycle power source if code is not being scanned. The circuit is applicable for digitizing any analog signal with varying amplitudes and/or DC levels and is adaptable to microprocessor control. | |
