Patent ID: 7978220

Claim:
An optical apparatus comprising: an optical member provided on an optical axis, the optical member having a rectangular shape defined by two opposing height sides and two opposing width sides, the height sides being shorter than the width sides; a supporting member configured to support the optical member; and a single vibrating device fixed to the optical member proximate to and in parallel with one of the two height sides of the optical member and configured to vibrate the optical member, the vibrating device having a rectangular shape defined by two opposing longitudinal sides and two opposing shorter sides, wherein a plurality of node lines form parallel with the longitudinal sides of the vibrating device and two height sides of the optical member in a case where the vibrating device vibrates the optical member in a wave having a predetermined wavelength, and wherein a support position at which the optical member is supported by the supporting member is located inward from the other of the two height sides by ¼ the predetermined wavelength.