| 摘要 |
An optical apparatus includes a rectangular optical member provided on an optical axis, a supporting member configured to support the optical member, and a rectangular vibrating device stuck to the optical member close to and in parallel with one of four sides of the optical member and configured to vibrate the optical member in a wave fashion having a predetermined wavelength to have a plurality of nodes parallel with the one side. A support position at which the optical member is supported by the supporting member at a side opposite the one side of the optical member is located inward from the opposite side by ¼ the predetermined wavelength.
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