Movable optical unit, optical adapter, and endoscope apparatus

An optical adapter configured to be attachable to and detachable from a distal end portion of an insertion portion of an endoscope apparatus comprising an optical apparatus including:

• a movable optical unit comprising:
• a fixed shaft,
• a bearing through which the fixed shaft is inserted and which is polarized in a direction orthogonal to a long axis of the fixed shaft, the bearing having a rear face and a front face that are orthogonal to the long axis,
• a holding frame that is provided to be rotatable around the fixed shaft and holds at least one optical member, and
• a pair of arm members extending outward from the holding frame in a direction orthogonal to the long axis of the fixed shaft,
• wherein the pair of arm members being bonded to the bearing in a state of sandwiching the bearing in a direction along the long axis of the fixed shaft and configured to be rotatable around the fixed shaft;
• and
• the pair of arm members include a first arm member and a second arm member, and the first and second arm members sandwich the bearing by the first arm member coming into contact with the rear face of the bearing and the second arm member coming into contact with the front face of the bearing, and
• an electromagnetic drive unit that has an electromagnet acting on a magnetic pole of the bearing and rotates the bearing around the fixed shaft by the electromagnet.

An endoscope apparatus provided with an optical apparatus including a movable optical unit at a distal end portion of an insertion portion, the endoscope apparatus comprising:

• the optical apparatus including:
• the movable optical unit comprising:
• a fixed shaft,
• a bearing through which the fixed shaft is inserted and which is polarized in a direction orthogonal to a long axis of the fixed shaft, the bearing having a rear face and a front face that are orthogonal to the long axis,
• a holding frame provided to be rotatable around the fixed shaft and holding at least one optical member, and
• a pair of arm members extending outward from the holding frame in a direction orthogonal to the long axis of the fixed shaft,
• wherein the pair of arm members being bonded to the bearing in a state of sandwiching the bearing in a direction along the long axis of the fixed shaft and configured to be rotatable around the fixed shaft, and
• the pair of arm members include a first arm member and a second arm member, and the first and second arm members sandwich the bearing by the first arm member coming into contact with the rear face of the bearing and the second arm member coming into contact with the front face of the bearing,
• an electromagnetic drive unit that has an electromagnet acting on a magnetic pole of the bearing and rotates the bearing around the fixed axis by the electromagnet;
• an observation optical system that forms an optical image of an observation object on a predetermined light receiving surface;
• and
• an image pickup device that receives an optical image formed by the observation optical system and performs predetermined photoelectric conversion, wherein
• by rotating the bearing around the fixed shaft by the electromagnetic drive unit, the holding frame is rotated between a first position where the optical member is positioned on an optical axis of the observation optical system and a second position where the optical member is retracted from an optical axis of the observation optical system.