Control circuit for a bar code scanner
First Claim
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1. A bar code scanner, comprising:
- a source of electromagnetic energy for producing a beam of light,a scanner for scanning said beam of light across said bar code,a sensor for receiving said beam of light as it is reflected from said bar code for generating an electrical signal representative of said bar code,a first circuit for stopping said scanning after a predetermined number of scans,a second circuit for receiving said electrical signal representative of said bar code and for outputting a successful decode of said electrical signal, anda third circuit for starting said scanner for scanning said beam of light across said bar code if said second circuit has been unsuccessful in decoding said electrical signal.
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Abstract
A circuit is shown for use with a bar code scanner wherein the scanner includes a laser for producing a beam of light that is scanned across the bar code so that the light reflected from the bar code may be focused upon a sensor which produces an electrical signal representing the bar code. Scanning is stopped by a first circuit after a predetermined number of scans. Thereafter, a second circuit completes the decoding of the electrical signal and outputs the results if that decoding is successful. If not, a third circuit restarts the scanning within the first circuit.
42 Citations
17 Claims
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1. A bar code scanner, comprising:
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a source of electromagnetic energy for producing a beam of light, a scanner for scanning said beam of light across said bar code, a sensor for receiving said beam of light as it is reflected from said bar code for generating an electrical signal representative of said bar code, a first circuit for stopping said scanning after a predetermined number of scans, a second circuit for receiving said electrical signal representative of said bar code and for outputting a successful decode of said electrical signal, and a third circuit for starting said scanner for scanning said beam of light across said bar code if said second circuit has been unsuccessful in decoding said electrical signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A hand-held bar code scanner, comprising:
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a source of electromagnetic energy for producing a beam of light, a scanner for scanning said light beam across said bar code, optics for focusing said beam of light toward said bar code to illuminate said bar code which is reflected as a field of view, a sensor for receiving said reflected field of view and for generating an electrical signal representative of said bar code viewed within said field of view by said sensor, a first circuit for stopping said scanning after a predetermined number of scans, a second circuit, asynchronous from said first circuit, for receiving said electrical signal representative of said bar code and for outputting a successful decode of said electrical signal, and a third circuit for starting said scanner for scanning said light beam across said bar code if said second circuit has been unsuccessful in decoding said electrical signal. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method for scanning a bar code, comprising the steps of:
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producing a beam of light, scanning said beam of light across said bar code, receiving said beam of light reflected from said bar code and generating an electrical signal representative of said bar code, stopping said scanning after a predetermined number of scans, receiving said electrical signal representative of said bar code and decoding said electrical signal, and starting said scanning of said beam of light across said bar code if said second circuit has been unsuccessful in decoding said electrical signal. - View Dependent Claims (16, 17)
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Specification