Optical apparatus
An optical apparatus includes a driving unit, a holder holding the driving unit, a moving member holding an optical member and movable by drive of the driving unit, and a guide fixed to the holder in parallel to an optical axis direction. The driving unit is fixed to the holder by a screw and a nut. The nut includes a first plane part. The nut is disposed so that the first plane part of the nut is substantially orthogonal to a line connecting a center of the guide and centers of the screw and the nut when viewed in the optical axis direction.
1. An optical apparatus comprising:
a driving unit holding a lead screw;
a holder holding the driving unit;
a moving member that holds an optical member and that moves in an optical axis direction along the lead screw by drive of the driving unit; and
a guide that is pressed into and fixed to the holder in parallel to the optical axis direction,
wherein the driving unit is fixed to the holder by a screw, which extends in the optical axis direction, and a nut,
wherein the nut (a) includes a first plane part and a second plane part different from the first plane part, and (b) when viewed in the optical axis direction, is formed in a polygonal shape,
wherein, when viewed in the optical axis direction, the nut is disposed so that the first plane part of the nut is substantially orthogonal to a line connecting a center of the guide and a center of the nut,
wherein, when viewed in the optical axis direction, the nut is disposed so that the second plane part of the nut is substantially orthogonal to a line connecting a center of the driving unit and the center of the nut,
wherein, when viewed in a direction orthogonal to the optical axis direction, the holder includes a housing part for housing the nut, which is formed between a part where the driving unit is held and a part to which the guide is fixed, and a gap is formed between the nut and the housing part, and
wherein when viewed in a direction orthogonal to the optical axis direction, a position in the optical axis direction of a part of the holder at which the nut is arranged and a position in the optical axis direction of a part of the holder at which the guide is fixed by press fitting are overlapped with each other.
2. The optical apparatus according to claim 1 , wherein the driving unit is a stepping motor,
wherein an output shaft of the driving unit is provided with a lead screw, and
wherein the moving member moves through feeding by the lead screw.
3. The optical apparatus according to claim 1 , wherein the holder moves in the optical axis direction by a cam barrel and a straight barrel.
4. The optical apparatus according to claim 1 , wherein the optical member is a focus lens.
5. The optical apparatus according to claim 1 , wherein when viewed in the optical axis direction, the nut is formed in a regular hexagonal shape.
6. The optical apparatus according to claim 1 , wherein another end of the guide, which another end is not fixed to the holder, is not fixed to any members of the optical apparatus.