| 摘要 |
PROBLEM TO BE SOLVED: To provide a laser marker capable of preventing ghost phenomena, improving the intensity of line light, and preventing workmen from incorrectly recognizing line light. SOLUTION: An arch-like ceiling irradiation window part 7 is mounted to an upper part of a housing 4. A ceiling irradiation window 7a for making the inside and the outside of the housing 4 communicate with each other is formed in the ceiling irradiation window part 7 in such a way as to include the same surface as the surface of Fig and form an arch shape. A ceiling irradiation window dustproof cover 8 made of a film material constituted of polyester etc. capable of transmitting line light is mounted to the ceiling irradiation window part 7 in such a way as to block the ceiling irradiation window 7a. The ceiling irradiation window dustproof cover 8 therefore forms an arch shape in such away as to cover a ceiling wide-angle lens part 17. The overall internal side of the housing 4 of the ceiling irradiation window dustproof cover 8 is covered with an antireflection film 9 made of SiO<SB>2</SB>. COPYRIGHT: (C)2007,JPO&INPIT
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