| Patent Number |
Title Of Patent |
Date Issued |
| 5824450 |
Light irradiation method and optical information recording method |
October 20, 1998 |
| An irradiation method of applying a light spot or a light pattern to an object with high resolution is performed by disposing, in close vicinity to the object, a light-absorbing contrast-increasing layer whose transmittance or reflectivity with respect to an incident light thereto in |
| 5784355 |
Information recording method and device |
July 21, 1998 |
| A method of recording a bit stream on a Phase Change media by illuminating a laser beam on the Phase Change media includes assigning a predetermined number of channel bits to each bit of the bit stream, and assigning one of a highest power level, an intermediate power level, and a lowest |
| 5761179 |
Phase-change optical recording method using pulse width modulation technique |
June 2, 1998 |
| When recording data according to the PWM recording system by modulating signals, pulse modulation for pulse modulation for recording for recording a 0 signal or the like having a signal width of nT (T: Clock time) after modulation is a continuous electro-magnetic wave at a power level e, |
| 5750293 |
Method of recording and reproducing information |
May 12, 1998 |
| An optical recording medium composed of a transparent substrate, with an organic dye-containing layer and a light reflection layer formed on the substrate in that order, which recording medium performs recording and reproducing operations by the application of light beams used for the |
| 5740149 |
Phase-change type optical recording and reproducing method |
April 14, 1998 |
| When recording data according to the PWM recording system by modulating signals, pulse modulation for pulse modulation for recording for recording a 0 signal or the like having a signal width of nT (T: Clock time) after modulation is a continuous electro-magnetic wave at a power level e, |
| 5738973 |
Optical information recording medium |
April 14, 1998 |
| An irradiation method of applying a light spot or a light pattern to an object with high resolution is performed by disposing, in close vicinity to the object, a light-absorbing contrast-increasing layer whose transmittance or reflectivity with respect to an incident light thereto in |
| 5738960 |
Optical information reproducing method |
April 14, 1998 |
| An irradiation method of applying a light spot or a light pattern to an object with high resolution is performed by disposing, in close vicinity to the object, a light-absorbing contrast-increasing layer whose transmittance or reflectivity with respect to an incident light thereto in |
| 5473591 |
Method for recording and reproducing data on recording mediums |
December 5, 1995 |
| The present invention relates to a method of recording and reproducing data on a recording medium, wherein original data is recorded on a recording medium by converting it into a code having more than one "0" between bits "1" such as MFM code and RLL (1,7) code, and a timing of a zero-cr |
| 5353271 |
Method and apparatus for recording or reproducing information on or from recording medium |
October 4, 1994 |
| A method for recording or reproducing information on or from a recording medium, the method capable of reproducing serial data on the basis of signals derived on each of front edges or each of rear edges of a plurality of pieces of recorded information on the recording medium, includ |
| 5239531 |
Optical information recording method using modulated optical beam |
August 24, 1993 |
| An optical information recording method for recording one of signals "1" and "0" in each of bit positions alloted at regular intervals along a track of a recording medium. The method comprises the step of enhancing energy for recording a bit of "1" which is directly subsequent to a bit o |
| 5226031 |
Method of reproducing information by optically scanning marks on a recording medium with compens |
July 6, 1993 |
| A method of reproducing optical information by utilizing an optical information recording medium is disclosed, in which a timing mark is formed on each information track in the recording medium; an information mark is formed on each information track with a predetermined cycle at a p |
| 5196250 |
Optical information recording medium |
March 23, 1993 |
| An optical information recording medium is composed of a substrate and a recording layer which includes a diarylpolyene compound of formula (I): ##STR1## wherein A.sup.1 and A.sup.2 each independently represent an aryl group which may have a substituent; R.sup.1 and R.sup.2 each repr |
| 5144552 |
Optical information storage medium having grooves and pits with specific depths, respectively |
September 1, 1992 |
| An optical information storage medium is used for recording optical information therein and reproducing optical information therefrom. The optical information storage medium includes parallel, concentric, or helical tracking guide grooves and information tracks defined between the tr |
| 4891305 |
Optical information recording element |
January 2, 1990 |
| This invention relate to an optical information recording medium, characterized by having an organic thin film recording layer containing at least one of compounds expressed by the general formula (I), (II), (III) and (IV): ##STR1## (wherein in the above formulas, A, B, D and E r |
| 4829499 |
Processing of a detection signal obtained by scanning an optical disk |
May 9, 1989 |
| An information signal reconstructing method and apparatus for use in an optical disk system is provided. Data stored on an optical disk in a binary format is optically scanned by a photodetector to provide a detection signal. The average of this detection signal is first determined a |
| 4767693 |
Optical information recording medium |
August 30, 1988 |
| This invention provides an optical information recording medium that has, on a substrate, a recording layer containing a cyanine dye represented by the general formula: ##STR1## (wherein, R.sub.1, R.sub.2 and R.sub.3 may be the same or different and each stands for a substituted |
| 4758499 |
Optical information recording medium |
July 19, 1988 |
| This invention relates to an optical information recording medium, characterized by having an organic thin film recording layer containing at least one of triaryl methane type coloring matters expressed by the general formula (1), (2) or (3): ##STR1## (wherein, in the above formu |
| 4714667 |
Optical information recording medium |
December 22, 1987 |
| The present invention relates to an optical information recording medium comprising a recording layer applied directly on a substrate or applied on a substrate by intervening an underlayer therebetween, and further comprising a protective layer on said recording layer if necessary, c |
| 4696892 |
Optical information recording medium |
September 29, 1987 |
| This invention relates to an optical information recording medium, characterized in that on a substrate there is applied a coloring matter film chemically inert to said substrate, said coloring matter film having an extinction coefficient of at least 1. |
| 4656121 |
Optical information recording medium |
April 7, 1987 |
| This invention relates to an optical information recording medium having an organic thin film recording layer, and optionally having an underlayer and/or protective layer, characterized in that at least one of said recording layer, underlayer and protective layer contains a compound |
| 4652514 |
Optical information recording medium |
March 24, 1987 |
| An optical information recording medium which comprises the provision of a thin film (recording layer) formed of a cyanine coloring matter and a transition metal complex being superior in long wavelength range light absorbability to said coloring matter on a transparent or opaque substra |
| 4600625 |
Optical information recording medium |
July 15, 1986 |
| An optical information recording medium being capable of writing and reading with laser beam which comprises forming, on a transparent or opaque substrate, a thin film (recording layer) containing a cyanine coloring matter represented by the general formula: ##STR1## (wherein, R. |
| 4525625 |
Focussing control with astigmatic diffracting means |
June 25, 1985 |
| Disclosed in this specification is a focussing control method for a laser retrieval apparatus. An astigmatic light flux of a laser beam is produced by a diffraction grating or hologram. It is received by a light sensitive device which is divided into four equal areas. The output signals |
| 4477555 |
Optical information recording medium |
October 16, 1984 |
| An optical information recording medium comprising a substrate and a recording layer superimposed on said substrate, said recording layer comprising a reflective layer in which metal particles with a particle diameter of 1500.ANG. or less have been distributed closely and a light abs |
| 4460665 |
Optical information recording medium |
July 17, 1984 |
| An optical information recording medium comprises a transparent or opaque substrate and a cyanine coloring matter-containing thin coloring matter layer formed on said substrate. This recording material is adapted for laser beam reading and writing. |
| 4225211 |
Random phase plate for holography and process for manufacturing same |
September 30, 1980 |
| A coating material such as a solution of polyvinyl butyral resin in benzene is applied to a transparent base in such a manner that the thickness thereof varies in a continuous and random manner so that concentration of light in the central area of a hologram produced using the plate is b |
