| 摘要 |
PURPOSE:To measure the light and the distance accurately even in high-speed photography, by providing a bound preventing lever for each of a main movable mirror and a sub-movable mirror to prevent the bound of the sub-movable mirror after preventing the bound of the main movable mirror. CONSTITUTION:In a mirror box 1, a main movable mirror 2 and a submovable mirror 3 are supported pivotally by pivots 2a and 3a, and a cam 3c which is formed into one body together with the mirror 3 is engaged with a pin 5b of a driving lever 5. Mirrors 2 and 3 are provided with levers 6 and 7 which are engaged with mirrors to prevent their bound when mirrors are returned, and these levers 6 and 7 are charged clockwise by springs 6b and 7b. In case that jumped mirrors 2 and 3 are returned, a pin 2c of the mirror 2 and the lever 6 are engaged with each other to prevent the bound, and next, the bound of the mirror 3 is prevented by the lever 7. Thus, it is unnecessary to wait as conventional until the bound is stopped, and the light and the distance are measured accurately in a short time even in the high-speed photography. |
