Patent ID: 7757575

Claim:
An optical apparatus comprising: a holding member configured to hold an optical member; a rack attached to the holding member; and an actuator configured to rotate a lead screw engaging with the rack, wherein the rack is formed as an integrally-formed member including (a) an attachment portion at which the rack is attached to the holding member, (b) a first tooth portion and a second tooth portion engaging with the lead screw so as to sandwich the lead screw there between, and (c) a connecting portion connecting the attachment portion and the second tooth portion and having elasticity, wherein the first tooth portion, the second tooth portion and the connecting portion have been formed with a same die, the die having been removed from between the first tooth portion and the second tooth portion in a removing direction orthogonal to the optical axis, wherein, when viewed from an optical axis direction of the optical apparatus, the second tooth portion is formed to have a gap from the first tooth portion such that a width of the gap in a direction orthogonal to the removing direction becomes narrower with increased distance from the attachment portion in the removing direction, and wherein, when viewed from the optical axis direction, the connecting portion is provided with a protrusion protruding toward the first tooth portion in the direction orthogonal to the removing direction, and wherein, when viewed from the optical axis direction, the protrusion is formed to have a gap from the first tooth portion such that a width of the gap in the direction orthogonal to the removing direction becomes narrower with increased distance from the attachment portion in the removing direction, and wherein, when viewed from the optical axis direction, an inclination angle of the protrusion with respect to the first tooth portion is larger than an inclination angle of the second tooth portion with respect to the first tooth portion.