| 摘要 |
PROBLEM TO BE SOLVED: To have shock resistant properties, capable of 10,000 G of impact acceleration and to secure accurate operation after collision. SOLUTION: A conical support projection that is a part of a gear is inserted in a thrust bearing member 9 of bearings 7 applied to an observation apparatus. The thrust bearing member 9 is covered by a cylindrical rubbery body 11 having its bottom, which provides a holder 13 on the inside and a case 13 on the outside, and a dish spring 10 is arranged between the thrust bearing member 9 and the holder 12. The holder 12 is coated with molybdenum disulfide. Silicone rubber for low temperature application is used for the rubbery body 11. Each member of the bearings 7, in a large gear wheel side, is flush with a face S and is set apart from a flat portion T of the large gear wheel by a clearance K corresponding to a maximum allowable bending amount. By the maximum allowable bending amount is meant the maximum displaced amount, which permanently prevents its dropping-out and the like.
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