Abstract: To secure smooth operation states of a movable body and achieve improvement in functionality. An optical device includes: a movable body including an optical element; a support body configured to support the movable body; at least one first spherical body configured to be positioned between the movable body and the support body in an axial direction of a first fulcrum axis orthogonal to an optical axis and to be rollable; and at least one second spherical body configured to be positioned between the movable body and the support body in an axial direction of a second fulcrum axis orthogonal to the optical axis and the first fulcrum axis and to be rollable.

Abstract: The present invention relates to a feed screw driving apparatus that moves a power transmission member, which engages a feed screw, in an axial direction of the feed screw by rotationally driving the feed screw using a driving source, such as an electric motor, and also to an information recording and/or reproducing apparatus that moves a pick-up apparatus with this feed screw driving apparatus and records and/or reproduces an information signal onto or from a disc-like recording medium In a feed screw driving apparatus that moves a power transmission member, which engages a feed screw, in an axial direction of the feed screw by rotationally driving the feed screw using a driving source, there is provided an elastic member that energizes the power transmission member in the axial direction of the feed screw.

Abstract: A tilt adjusting method for a recording medium driving apparatus including a linear driving device including first and second parallel guide shafts. The method provides a flat mirror on a turntable, an auto-collimator, and a skew angle adjusting jig including an optically flat surface. In a first state of the jig, a height of the second end of the first shaft is adjusted so that a tilt of the first shaft in a radial direction matches a tilt of the mirror, and a height of the first end of the second shaft is adjusted so that a tilt of the first shaft in a tangential direction matches the tilt of the mirror. And, in a second state of the jig, a height of the second end of the second shaft is adjusted so that a tilt of the second shaft in a radial direction matches the tilt of the mirror.

Abstract: A recording medium driving apparatus can adjust the position of a linear driving means with respect to a turntable with high precision, so that a direction in which the head apparatus is moved by the linear driving means matches a predetermined radial direction with respect to a rotational center axis of the turntable. The recording medium driving apparatus includes a chassis 70, a rotating plate 63 that is rotatably provided on the chassis 70, a rotational center determining means 61 that determines the rotational center of the rotating plate 63 with respect to the chassis 70, and a rotational driving means 62 for rotating the rotating plate 63 around the rotational center.

Abstract: The present invention relates to a feed screw driving apparatus that moves a power transmission member, which engages a feed screw, in an axial direction of the feed screw by rotationally driving the feed screw using a driving source, such as an electric motor, and also to an information recording and/or reproducing apparatus that moves a pick-up apparatus with this feed screw driving apparatus and records and/or reproduces an information signal onto or from a disc-like recording medium

Abstract: A tilt adjusting method that can precisely adjust the parallelism between a plane on which a recording medium is mounted on a turntable and a plane that is perpendicular to an optical axis of a recording medium apparatus is provided.

Abstract: A recording medium driving apparatus can adjust the position of a linear driving means with respect to a turntable with high precision, so that a direction in which the head apparatus is moved by the linear driving means matches a predetermined radial direction with respect to a rotational center axis of the turntable. The recording medium driving apparatus includes a chassis 70, a rotating plate 63 that is rotatably provided on the chassis 70, a rotational center determining means 61 that determines the rotational center of the rotating plate 63 with respect to the chassis 70, and a rotational driving means 62 for rotating the rotating plate 63 around the rotational center.