| 摘要 |
PURPOSE:To obtain an exposure device with a simple mechanism by driving a blade which has plural stop apertures of different size and a cam turning a blade which has an aperture for exposure in a simple exposure controlle of a small-sized camera. CONSTITUTION:The 1st blade 3 where the exposure aperture 2 of a substrate 1 is supported 5 pivotally in an opening/closing state is provided with an opn- aperture stop 3a and a small stop 3b, and the 2nd blade 4 is provided with the exposure hole 4a. The 1st blade has a raised part 3c abutting on an external surface cam 7 and the 2nd blade has a pin 4b abutting on an internal surface cam 8. When a motor turns the external surface cam and internal surface cam counterclockwise in one body, the 2nd blade swivels to left firstly beyond the aperture, and then the 2nd blade has the stop aperture overlapping with the aperture successively, so the stop aperture is held selectively by a locking means which is not shwon in a figure, and the 2nd blade turns up to a right swivel position to return to its original state. Therefore, complicate reciprocating motion is reallized only by a unidirectional rotating mechanism. |
