Patent Number: 7,787,031

Title: Image-pickup apparatus for dust prevention

Abstract: An optical filter which can remove dust stuck to the incidence surface of incidence of light and reduce the mounting space. A filter body is adapted to have predetermined transmittivity as well as a piezoelectric characteristic. At least two electrodes are formed on the filter body. A drive voltage is applied between the at least two electrodes to vibrate the filter body.

Inventors: Hozumi; Yasushi (Ageo, JP), Noto; Goro (Tokyo, JP), Itoh; Isami (Mishima, JP)

Assignee: Canon Kabushiki Kaisha

International Classification: H04N 5/217 (20060101)

Expiration Date: 8/31/12018