| 摘要 |
PROBLEM TO BE SOLVED: To provide a focal plane shutter having a substrate superior in wear resistance and corrosion resistance. SOLUTION: The focal plane shutter includes a front curtain 10 having blades 11 to 14 and a rear curtain 20 having blades 21 to 24. A rear curtain arm 26 pivotally supports the blades 21 to 24 turnably through connection pins 27a to 27d, and a first substrate 30 having an opening 30a is disposed in parallel with and adjacently to a turning trajectory surface of the rear curtain arm 26 and has a nickel plating layer 2 and a black oxide layer 3 formed on a surface A thereof to suppress progress of wear and has the surface of the black oxide layer 3 treated by sand blasting to enhance the corrosion resistance of the substrate. A surface B of a second substrate 31 is treated in the same manner. COPYRIGHT: (C)2006,JPO&NCIPI
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