| 摘要 |
An optical apparatus according to this invention has an optical member for scanning light beams, a datum surface to which the optical member is fixed, an elastic member for fixing the optical member to the datum surface by pressing the optical member against the datum surface so that the optical member is placed easily and accurately on the datum surface by means of the elastic member. The optical member is fixed to the datum surface only by means of the elastic member, enabling the optical member to be replaced easily.
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