| 摘要 |
PROBLEM TO BE SOLVED: To decrease a load on a source battery to increase its service life and downsize it by improving a driving circuit of laser beam sources in a laser marking device comprising a plurality of the laser beam sources. SOLUTION: This laser marking device comprises a plurality of the laser beam sources 31, 41, 51, and the driving circuit of the laser beam sources, which periodically puts on the light of the laser beam sources. When the circuit puts on any one of the laser beam sources, it puts out the light of the other laser beam sources. The laser marking device may comprise two laser beam sources. When the laser marking device comprises three laser beam sources, the driving circuit of the laser beam sources may shift lighting timing of each laser beam sources. When any one of the laser beam sources is put out, two other laser beam sources may be put on with three laser beam sources.
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