| 摘要 |
<p>PURPOSE:To obtain a photochopper which does not generate an uneven rotation depending on its set state, by constituting so that an almost semicircular plate- like member and a block for supporting the member concerned have a recessed part on the same side as the plate-like member, against the rotary shaft of the body, and the center of gravity of the body comes on the rotary axis. CONSTITUTION:A block 20 has a recessed part 21 formed by notching the same side as a member 10, against a rotary shaft l0 of a body 8, and is constituted of mechanical dimensions derived and calculated from a static balance conditional expression of the body 8, so that the center of gravity of the body 8 comes on the rotary shaft l0. In case when this photochopper is installed to an infrared ray gas analyzing apparatus, a magnet, a ball bearing, etc. are provided, therefore, it is necessary to derive a static balance conditional expression which takes them into consideration. Since the static balance is obained irrespective of a set state of the body, an uneven rotation by operation of gravity is not generated.</p> |
