| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce impact from the outside from being propagated to a photomultiplier tube (PMT). <P>SOLUTION: An optical measurement device 100 comprises a PMT 40, a magnetic shield 44 which accommodates the PMT 40 therein, and a PMT case 45 which accommodates the magnetic shield case 44 therein. Th PMT 40 is held elastically at multiple points in the magnetic shield case 44 by a plurality of elastic members 46 between the PMT 40 and the magnetic shield case 44, and the magnetic shield case 44 is held elastically at multiple points in the PMT case 45 by a plurality of elastic members 47 between the magnetic shield case 44 and the PMT case 45. Thus, vibration resistance can be improved while maintaining hold performance of the PMT 40. Furthermore, since the PMT case 45 is disposed to form a gap between the PMT case 45 and a housing 10, even when power is applied to the housing 10, the power is prevented from being propagated to the PMT 45, and, to the PMT 40 as a result. <P>COPYRIGHT: (C)2013,JPO&INPIT |
