Tdk Corporation

Tdk Taiwan Corporation

Nobuo Uekusa

Noriyuki Kawano

Hiroyuki Matsuura

Yasuhiro Terasaki

Mitsuru Kinouchi

Yoshio Saito

Kouichi Ogura

Yi Lang Chan

Masara Uno

The invention provides an optical head device in which the influence of mechanical vibration generated at resonance frequencies of high orders (second and higher orders) can be eliminated and an optical recording/reproducing apparatus utilizing the same. Sidewalls are formed from both ends of a sidewall constituting the top side of a trapezoidal contour of a lens holder portion, the sidewalls extending in the form of a fan to define a predetermined angle between them. A damping system includes a weight in the form of a metal thin plate and a visco-elastic adhesive for bonding the weight to the sidewalls. The visco-elastic adhesive transfers vibration of the lens holder in the direction of an optical axis of an objective lens to the weight and has a viscous damping property which damps vibration of the weight in the direction of the optical axis.

Optical head device and optical recording/reproducing apparatus utilizing the same

An optical head device for an optical disk apparatus for optically reading and writing information by irradiating a light spot onto an information recording surface of an optical recording medium, which is capable of moving an objective lens to a predetermined position even when part of the drive coil is included in an neutral area n in the vicinity of the magnetic boundary. There are provided two driving force generating units, including two magnetsanddisposed in the tangential direction of an optical disk separately on the opposite sides of an objective lens, and coil unitsandfor generating the driving force directed against the magnetsanddisposed on a lens holder, and the magnetsandand the coil unitsandare arranged in such a manner that the driving force other than the driving force generated for tracking movement and the moment act against each other at the two driving force generating units.

Optical head device for an optical disk apparatus reading and writing information on an optical disk

An optical pickup comprises an objective-lens driving device including a movable section provided with an objective lens, a focusing coil, and tracking coils, and a fixed section provided with a single magnetic circuit having a magnetic gap, the focusing coil and the tracking coils being disposed in the magnetic gap. The point of application of a tracking-driving force, the point of application of a result force of focusing-driving forces occurring in and outside the magnetic gap, and the position of the center of gravity of the movable section are made to substantially coincide with each other. In addition, the objective lens and the magnetic circuit are disposed within an area of a window in a lower shell of a optical disk. Further, a through hole for accommodating a lower portion of a yoke of the magnetic circuit is provided in a mounting base on which the objective-lens driving device is mounted. An inclining fulcrum and a height adjusting means for inclining the objective-lens driving device about the inclining fulcrum are provided in the vicinities of the through hole.

Optical pickup

An objective lens driver in which a movable portion,with an objective lens,is supported on a fixed portion by two groups of elastic supporting members each being horizontally bent which are disposed on both sides of the objective lens,such that each group of elastic supporting members are vertically arranged on each side of the objective lens, and the upper elastic supporting members of the groups of elastic supporting members are spaced from each other horizontally, is improved such that each group of elastic supporting members vertically arranged on each side of the objective lens are not parallel to each other. Further, damping material are fixedly disposed between both ends of the elastic supporting members and stuck onto the elastic supporting members, and the amount of the damping material on one side of the objective lens is different from that of the damping material on the other side of the objective lens, and a method of manufacturing the objective lens driver.

Objective lens driving device

An objective lens driver in which a movable portion 1 with an objective lens 11 is supported on a fixed portion by two groups of elastic supporting members each being horizontally bent which are disposed on both sides of the objective lens 11 such that each group of elastic supporting members are vertically arranged on each side of the objective lens, and the upper elastic supporting members of the groups of elastic supporting members are spaced from each other horizontally, is improved such that each group of elastic supporting members vertically arranged on each side of the objective lens are not parallel to each other. Further, damping material are fixedly disposed between both ends of the elastic supporting members and stuck onto the elastic supporting members, and the amount of the damping material on one side of the objective lens is different from that of the damping material on the other side of the objective lens, and a method of manufacturing the objective lens driver.

Objective lens driving device and manufacturing method thereof

An objective lens drive device has a movable section which has an objective lens and is supported by wires extended from a stationary section, and the wires which are positioned by guide holes formed in the movable section or stationary section. In the device, the wires are fixedly positioned in such a manner that the wires are in contact with the inner walls of the guide holes.

Objective lens drive device and method of manufacturing the same

An optical pickup comprises an objective-lens driving device including a movable section provided with an objective lens, a focusing coil, and tracking coils, and a fixed section provided with a single magnetic circuit having a magnetic gap, the focusing coil and the tracking coils being disposed in the magnetic gap. The point of application of a tracking-driving force, the point of application of a result force of focusing-driving forces occurring in and outside the magnetic gap, and the position of the center of gravity of the movable section are made to substantially coincide with each other. In addition, the objective lens and the magnetic circuit are disposed within an area of a window in a lower shell of a optical disk. Further, a through hole for accommodating a lower portion of a yoke of the magnetic circuit is provided in a mounting base on which the objective-lens driving device is mounted. An inclining fulcrum and a height adjusting component for inclining the objective-lens driving device about the inclining fulcrum are provided in the vicinities of the through hole.

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Tokyo, Japan

Nobuo Uekusa