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| Number | Title | Issue Date |
| 7257070 | Optical disc recording and/or reproducing apparatus and aberration adjustment method The astigmatic aberration in an optical system is to be adjusted. Specifically, in an optical disc device on which can be selectively loaded a first optical disc having a first index of double refraction or a second optical disc having a second index of double refra... | 08/14/2007 |
| 7106681 | Optical head arrangements with single substrate lasers An optical head with a plurality of semi-conductor laser chips for use in reducing inclination or gradient of more than one beam presently falling onto a focusing lens is disclosed. To this end, a double mirror or alternatively beam reshaping means is disposed which... | 09/12/2006 |
| 7068576 | Optical disc recording and/or reproducing apparatus and aberration adjustment method The astigmatic aberration in an optical system is to be adjusted. Specifically, in an optical disc device on which can be selectively loaded a first optical disc having a first index of double refraction or a second optical disc having a second index of double refra... | 06/27/2006 |
| 5400314 | Optical pickup using a lamp An optical pickup for use in various optical recording/reproducing apparatus includes a general-purpose lamp producing a wide range of light wavelengths, a converging device for converging the light of the lamp, and a pinhole and color filter for enhancin... | 03/21/1995 |
| 4160269 | Apparatus for optically reading a phase-modulated optical record carrier Apparatus for reading a record carrier provided with a spiral structure in which sound and/or image information is stored in the form of frequency modulated or phase modulated signals is disclosed. The carrier structure is composed of coplanar regions of ... | 07/03/1979 |
