| 摘要 |
A plane parallel plate 91 constituted with optical glass and disposed further frontward relative to an image-capturing element 10 is caused to swing and vibrate by alternately expanding and contracting piezoelectric elements 92a and 92c. As the plane parallel plate 91 becomes slanted relative to the image-capturing element 10, the angle of incidence of subject light 20 changes, causing the position of the subject image projected on the image-capturing element 10 to move from point A to point B. As a result, the image forming position vibrates parallel to the x-axis, thereby enabling the plane parallel plate 91 to function as a low pass filter for the spatial frequency manifesting along the x direction.
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