Panasonic Intellectual Property Management Co., Ltd.

Panasonic Corporation

Hideki Shirane

Teruyuki Takizawa

Hironori Tomita

Takeshi Nakazawa

Jiro Seki

Kiyoshi Masaki

Kazuhiko Miyazaki

Shinichi Yamada

Masaya Kuwahara

An input/output operation device includes an actuator detection circuit part, a drive circuit part, a drive control calculation processing part that controls the drive circuit part, and a rotation body on which the actuator is installed. The actuator includes a movable unit freely rotatable independently about two axes orthogonal to each other, a fixed unit supporting the movable unit for free rotation, and a drive part driving the movable unit with respect to the fixed unit. The detection circuit part outputs a position signal corresponding to a position of an operation part. The drive circuit part controls the drive part. The rotation body rotates about a rotation axis, in which the control calculation processing part controls the drive of the operation part through use of a coordinate system stationary with respect to a reference rotation angle of the rotation body at different rotation angles of the rotation body.

Input/output operation device

Provided is an input/output operation device including: an operation unit, which is operated by an operator; a detection unit, which detects a position of the operation unit to generate a position signal corresponding to the position of the operation unit; a control circuit, which receives the position signal to generate a speed control signal; and a drive circuit, which receives the speed control signal to drive the operation unit, in which the control circuit: (a) causes the position signal to pass through a first filter circuit to generate a speed signal; (b) causes the position signal to pass through a second filter circuit, which has a frequency transmission characteristic that is different from that of the first filter circuit, to generate a correction signal; and (c) adds at least the speed signal and the correction signal together to generate the speed control signal.

An input/output operation device () includes: an operation part (); a movable unit () including a loosely fitted space inside, a main body supporting the operation part () and including a first loosely fitted surface () exposed in the loosely fitted space, and at least one drive magnet (); a fixed unit including a second loosely fitted surface () in point- or line-contact with the first loosely fitted surface of the movable unit, a holder () supporting the movable unit for free rotation, a base () including a space for accommodating at least a part of the movable unit and supporting the holder, and at least one drive coil (); a drive part to rotate the movable unit with respect to the fixed unit; and a detector to detect a position of the operation part in the fixed unit. One of the first and second loosely fitted surfaces includes an inner peripheral surface formed into a recessed portion, and another one of the first and second loosely fitted surfaces includes at least one protruded spherical surface.

A selector includes a lever guide, an operating lever, and a stopper. The lever guide has first and second movable-path slits therein. The first movable-path slit extends from a first position to a second position along a first direction. The second movable-path slit extends along a second direction different from the first direction as to intersect the first movable-path slit at an intersection position. The second movable-path includes a third position. The operating lever is movable in along the first and second movable-path slits. The operating lever is configured to move to the first position through the first and second movable-path slits. The stopper slides and contacts the operating lever when the operating lever moves from the third position to the first position. The stopper slides and contacts the operating lever when the operating lever moves from the first position to the third position. The stopper opens and closes an opening-and-closing target path out of the first movable-path slit between the second position and the intersection position in conjunction with a movement of the operating lever.

Selector

A second tracking error detector detects the displacement between the track and the light beam and outputs a second displacement detection result based on the comparison of the reproduction signals between first and second pit strings respectively. A second tracking error controller corrects a target position for push-pull control based on the second displacement detection result. A third tracking error controller calculates a correction data of a first displacement detection result based on the correction amount of the target position by the second tracking error controller, and corrects the first displacement detection result based on the calculated correction data.

Tracking error control apparatus, tracking error control circuit, optical disk apparatus and tracking error control method

An optical disc apparatus has: an optical headfor emitting a light beam onto a predetermined track of an optical discbefore tracking control in order to detect reflected light with a photodetector; an arithmetic circuitfor generating measurement signals each indicative of a time-varying change of light received on a respective one of a plurality of light receiving areas of the photodetector; an A/D converter circuitfor A/D converting each measurement signal; a microcomputerfor determining a correction value based on a difference, in terms of high- and low-frequency components, between measurement signals having been A/D converted; and an adder circuitfor adding the correction value to a driving value output from a tracking control circuit, so that the driving value is corrected.

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Osaka, Japan

Hideki Shirane