Patent EP0378199A2 successfully refreshed from Google Patents.
EP0378199A2
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EP
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Mark reading device
Assignee: Offta Pubco Licza Uso Non Esclusivo Offerta Lic
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Filing: 1990-01-10
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Granted: —
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Expires: 2010-01-10
Abstract
Abstract A mark reading device (1) that reads marks such as a bar code, or the like on a remote surface (6). A laser beam is outputted, deflected through a scan angle and the reflected energy is read at a detector (7). This energy is processed and converted to a usable format for input into a computer, cash register, or any type of data collection device. The present invention improves depth of field and readability by varying the output energy of the laser (2) after each successive scan, thus providing a range of energy levels at the detector.
Inventors
- 👤 Shinya C/O Osaka Works Takenaka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 19:24
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/10; G06K7/10544; G06K7/10821; G06K7/10851; G06K2207/00; G06K2207/1018
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
72 words
A mark reading device comprising; a laser oscillating unit outputting a laser beam; deflecting means for deflecting said laser beam, cyclicly, through a predetermined scan angle; receiving means for reading said laser beam upon reflection from an object surface; scan detecting means for outputting a scan termination signal after each of said scans; and controller means for varying the output energy of said laser beam in response to said scan termination signal;
Claim 2
Dependent Claim
72 words
A mark reading device comprising; a laser oscillating unit outputting a laser beam; deflecting means for deflecting said laser beam, cyclicly, through a predetermined scan angle; receiving means for reading said laser beam upon reflection from an object surface; scan detecting means for outputting a scan termination signal after each of said scans; and controller means for varying the output energy of said laser beam in response to said scan termination signal;
Claim 3
Dependent Claim
39 words
A mark reading device as described in claim 1; wherein said controller means is configured so as to vary the output energy of said laser beam by an incremental step in response to each of said scan termination signals.
Claim 4
Dependent Claim
103 words
A mark reading device as described in claim 1; wherein said controller means is configured so as to vary the output energy of said laser beam by an incremental step in response to each of said scan termination signals whereby; at least one the incremental steps corresponds to an energy level lower than the usually set laser output energy level; at least one of the incremental steps corresponds to an energy level equal to the usually set laser output energy level; and at least one of the incremental steps corresponds to an energy level higher than the usually set laser output energy level.
References Cited (Backward Citations)
No citation records indexed.
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