FILTER UNIT AND MANUFACTURING METHOD OF FILTER UNIT

To guarantee increase in the quality of a captured image by suppressing a situation where a distortion occurs in a filter lens stored in a filter frame.SOLUTION: A filter unit is attached to a lens barrel of an imaging device and comprises: a filter lens; an annular filter frame which stores the filter lens; and an elastic body which is interposed between a lateral surface of the filter lens and an inner side surface of the filter frame and supports the filter lens in a state of being in non-contact with the filter frame. The filter unit also includes a protrusion which is located on a subject side with respect to the elastic body on the inner side surface of the filter frame and protrudes to the radial direction inner side so as to be opposed to at least an outer edge region of the filter lens surface. A gap is formed between the protrusion and the surface of the filter lens. The thickness of the gap is between 0.01 mm and 0.7 mm. The filter unit also includes a filter lens positioning protrusion which is provided so as to protrude toward the radial direction inner side from the inner side surface of the filter frame and performs positioning of the filter lens by contacting the lateral surface of the filter lens.SELECTED DRAWING: Figure 3 【課題】フィルター枠に収容されたフィルターレンズに歪みが生じる事態を抑制し、撮像される画像の高画質化を担保する。【解決手段】フィルターユニットは、撮像装置のレンズ鏡筒に取り付けられ、フィルターレンズと、フィルターレンズを収容する環状のフィルター枠と、フィルターレンズの側面とフィルター枠の内側面との間に介在し、フィルター枠に非接触な状態でフィルターレンズを支持する弾性体とを備え、フィルター枠の内側面において、弾性体より被写体側に位置すると共に、フィルターレンズ表面の少なくとも外縁領域と対向するよう径方向内側に突出する突部が設けられ、突部とフィルターレンズの表面との間に間隙が形成され、間隙の厚みが、０．０１ｍｍ～０．７ｍｍであり、フィルター枠の前記内側面から径方向内側に向けて突設され、フィルターレンズの側面と接触してフィルターレンズの位置決めを行うフィルターレンズ位置決め用突部が形成される。【選択図】図３