Laser energy measuring unit and laser machining apparatus
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United States of America Patent
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Apr 19, 2011
Grant Date -
Oct 2, 2008
app pub date -
Feb 20, 2008
filing date -
Mar 28, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
There is provided a laser energy measuring unit whose laser energy measuring range is widened. The laser energy measuring unit has a filter provided within an optical path of a laser to attenuate energy of the laser, a calculating section for measuring the energy of the laser passing through the filter, and a condenser lens provided on one side of the filter for condensing the laser. The filter has a shading portion for blocking a center part of the laser beam from being transmitted through the filter at a position coincident with the center of the laser. The center part of the laser where its energy is large is cut by the shading portion, and the calculating section measures the part where its energy is not so large. Thereby, it is possible to widen the laser energy measuring range.
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