Vibration apparatus and imaging appliance

An imaging appliance comprising:

• an image surface configured to generate an optical image;
• a plate-shaped dust prevention member including a light transmissive region having a predetermined area spread from a central portion in radial directions, and disposed such that the light transmissive region faces the image surface with a predetermined gap therebetween;
• a securing member disposed to have a predetermined gap between itself and the dust prevention member;
• a vibration application member configured to vibrate the dust prevention member, and including a piezoelectric member and electrodes, each of the electrodes formed of a conductive thin plate or film, disposed in a voltage-supplied region to partly or entirely hold the piezoelectric member, and partly extending outward relative to the dust prevention member;
• a facing member disposed to surround a center of the dust prevention member and to face one of the dust prevention member and the vibration application member on a side closer to the image surface;
• a support member disposed between the facing member and the one of the dust prevention member and the vibration application member and configured to support the dust prevention member or the vibration application member;
• and
• wherein the piezoelectric member consists of a plate-shaped resin comprised of a poly-L-lactic acid sheet and a poly-D-lactic acid sheet that are alternately layered and stretched in a direction orthogonal with an outer periphery line of the dust prevention member, is attached annularly along at least the peripheral portion of the dust prevention member, and is supplied with voltage in the voltage-supplied region.

A vibration apparatus comprising:

• a plate-shaped dust prevention member including a light transmissive region having a predetermined area spread from a central portion in radial directions;
• a securing member disposed to have a predetermined gap between itself and the dust prevention member;
• a vibration application member fixed to a peripheral portion of the dust prevention member, including a flexible thin plate-shaped piezoelectric member, and configured to vibrate the dust prevention member;
• a support member disposed between the securing member and the dust prevention member or the vibration application member to surround a center of the dust prevention member;
• an electrode formed of a conductive thin plate or film, disposed to partly or entirely holding the piezoelectric member, and partly extending outward relative to the dust prevention member;
• poly-L-lactic acid sheet or poly-D-lactic acid sheet stretched in a direction orthogonal with an outer periphery line of the dust prevention member, and wherein
• the electrode is disposed along the outer periphery line of the dust prevention member,
• the piezoelectric member includes layers of at least one of the poly-L-lactic acid sheet or the poly-D-lactic acid sheet, and
• the poly-D-lactic acid sheet and the poly-L-lactic acid sheet are alternately layered to form the piezoelectric member.