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| Number | Title | Issue Date |
| 7327648 | Player with rotational control for double-sided optical discs A double-sided optical disc, such as a DVD-18 disc, is formed with data tracks on each layer. The tracks on one side are oriented along one spiral while the tracks on the other side are oriented along a different spiral, the two spirals being oriented in opposite di... | 02/05/2008 |
| 7151734 | Player with two read heads for double-sided optical discs A double-sided optical disc, such as a DVD-18 disc, is formed with data tracks on each layer. The tracks on one side are oriented along one spiral while the tracks on the other side are oriented along a second spiral, the two spirals being oriented in opposite direc... | 12/19/2006 |
| 7050381 | Optical system having a convex surface for accessing a storage medium An optical system for accessing a storage medium. The system combines two kinds of laser diode, abandons some unnecessary optical elements used in the prior art, and further uses a Penta prism to fold the optical path. Moreover, the optical system uses a CZBO prism ... | 05/23/2006 |
| 5754509 | Disc device having heads mounted on the housing and movable in a radial direction A disc device accommodates a disc rotatably mounted therein, a plurality of first heads movable in a first direction radially of the disc, and a plurality of second heads movable in a second direction radially of the disc and perpendicular to the first di... | 05/19/1998 |
| 5719848 | Optical pickup system with independently movable multioptical elements An optical pickup system for supporting a plurality of objective lenses, which irradiate light spots on an optical disc having tracks, to guide and move the objective lenses in a tracking and a focus direction, comprises a first and a second optical picku... | 02/17/1998 |
| 5600623 | Disc device having a plurality of heads each movable within a limited distance A disc device accommodates a disc rotatably mounted therein, a plurality of first heads movable in a first direction radially of the disc, and a plurality of second heads movable in a second direction radially of the disc and perpendicular to the first di... | 02/04/1997 |
| 5327417 | Optical disk drive and read/write apparatus In order to provide an optical disk drive and read/write apparatus, the time of erasure, recording and reproduction of data by which is shortened to heighten the apparatus in access speed and data transfer speed, in the apparatus according to the present ... | 07/05/1994 |
