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| Number | Title | Issue Date |
| 5600618 | Optical data recording/reproducing device and integrated head An optical data recording/reproducing device, wherein the number of reflection in an optical path of coherent light formed between a coherent light source and an optical disk is twice or a larger even number of times, and the array direction of the cohere... | 02/04/1997 |
| 5523993 | Holographic optical element for optical disk pickup head A pickup head for use in optical disk systems such as compact disk players or CD-ROM computer memory includes a holographic optical element that has two decision regions that greatly simplify the design of the pickup head. The two decision regions diffrac... | 06/04/1996 |
| 5031166 | Optical disk tracking and seeking systems and specific track formats using discontinuities and circuitry therefor An optical disk recording system including a record medium is disclosed for providing an accurate track crossing count and an accurate track following signal. A first embodiment utilizes off-centered wobbled areas located in the headers of the record medi... | 07/09/1991 |
| 4959823 | Tracking and seeking system for use with an optical record carrier having a wobbled track format An optical disk recording system including a record medium is disclosed for providing an accurate track crossing count and an accurate track following signal. A first embodiment utilizes off-centered wobbled areas located in the headers of the record medi... | 09/25/1990 |
| 4914645 | Optical disk tracking and seeking systems and specific track formats using servo areas An optical disk recording system including a record medium is disclosed for providing an accurate track crossing count and an accurate track following signal. A first embodiment utilizes off-centered wobbled areas located in the headers of the record medi... | 04/03/1990 |
| 4879707 | Optical disk tracking and seeking systems specific track formats using discontinuities An optical disk recording system including a record medium is disclosed for providing an accurate track crossing count and an accurate track following signal. A first embodiment utilizes off-centered wobbled areas located in the headers of the record medi... | 11/07/1989 |
| 4879708 | Optical disk tracking and seeking systems specific track formats using wobbled pits An optical disk recording system including a record medium is disclosed for providing an accurate track crossing count and an accurate track following signal. A first embodiment utilizes off-centered wobbled areas located in the headers of the record medi... | 11/07/1989 |
| 4807212 | Correcting for comatic aberration in an optical head of an optical disk apparatus The present invention relates to an optical head of an optical disk apparatus and a method of making the same, and more particularly, to an optical head which projects a light spot onto a track recess, receives the reflected light of the light spot by at ... | 02/21/1989 |
| 4748609 | Method and apparatus for composite tracking servo system with track offset correction and rotary optical disc having at least one correction mark for correcting track offset A composite wobbled tracking servo system uses a rotary optical disc which has a header field and a data field alternately arranged along the direction of rotation to provide a sector, and which includes pregrooves formed in at least the data field and at... | 05/31/1988 |
| 4707816 | Method and apparatus for composite wobbled and push-pull tracking servo system A composite wobbled tracking servo system uses a rotary optical disc which has a header field and a data field alternately arranged along the direction of rotation, and which includes pregrooves formed in at least the data field and at least one pair of w... | 11/17/1987 |
| 4209804 | Record carrier containing information in an optically readable radiation reflecting information structure A record carrier is described having an optically readable radiation-reflecting information structure, comprising information areas arranged in information tracks, which areas are spaced from each other by intermediate areas, the information areas having ... | 06/24/1980 |
| 3969593 | Sound recording on color film by hue modulation Sound is recorded on color motion picture film in the form of variations of ue rather than overall density, with inverse density variations of different color media of the film directly superposed. With three distinct color media it is possible in that man... | 07/13/1976 |
