Optics: measuring and testing – Photometers – Comparison
Reexamination Certificate
2011-04-19
2011-04-19
Toatley, Gregory J (Department: 2877)
Optics: measuring and testing
Photometers
Comparison
C219S121370, C219S121830, C356S152100
Reexamination Certificate
active
07929127
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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Bukawa Katsurou
Watanabe Fumio
Alli Iyabo S
Hitachi Via Mechanics
Toatley Gregory J
Wenderoth , Lind & Ponack, L.L.P.
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