| 摘要 |
In a camera filter unit having a small longitudinal width, the camera filter unit (1) comprises a filter frame (2) having a cylindrical component (2a) and a filter-holding ring (3), and an optical filter (4). The optical filter (4) is fixed to an internal side of the filter-holding ring (3) in a state of being held from the front and the rear between a protuberance (31) formed in the filter-holding ring (3) and a crimp (33a). The filter-holding ring (3) is fixed to the internal side of the cylindrical component (2a) by a ring-side male thread (32) being screwed into a female thread (22) of the filter frame (2). The filter-holding ring (3) for holding the optical filter (4) is disposed concentrically between the cylindrical component (2a) and the optical filter (4), and the longitudinal dimension of the filter frame (2) can therefore be made smaller than when the member for holding the optical filter is mounted to the cylindrical component (2a) in a state of being aligned with the optical filter (4) in the axial direction.
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