| 摘要 |
PROBLEM TO BE SOLVED: To provide a focal-plane shutter capable of suppressing the occurrence of the blade shut caused by changes with the passage of time. SOLUTION: A leading blade driving lever 4 and a trailing blade driving lever 5 are turnably attached to a leading blade shaft 1d and a trailing blade shaft 1e provided on a shutter base plate 1. The respective driving levers are respectively driven by a leading blade driving spring 8 and a trailing blade driving spring 9. The biasing force of the respective driving springs is adjusted by a leading blade adjusting gear 6 and a trailing blade adjusting gear 7 turnably attached to the leading blade shaft 1d and the trailing blade shaft 1e. An upper base plate 3 includes a leading blade receiving surface 3a and a trailing blade receiving surface 3b that are position limiting surfaces in a thrust direction of the respective adjusting gears. An area of the leading blade receiving surface 3a is larger than that of the trailing blade receiving surface 3b. COPYRIGHT: (C)2010,JPO&INPIT |
