公开(公告)号：JPH04229431A

公开(公告)日：1992-08-18

申请号：JP14038191

申请日：1991-06-12

Applicant: BASF AG

Inventor： SHIYUTEFUAN IZERUBORUN ,  GERUTO FUITSUSHIYAA ,  HARUTOMUUTO HIBUSUTO

IPC: B41M5/26 ,  C23C14/06 ,  C23C14/34 ,  G11B7/0055 ,  G11B7/24 ,  G11B7/241 ,  G11B7/243 ,  G11B7/2433 ,  G11B7/253 ,  G11B7/2531 ,  G11B7/257 ,  G11B7/258 ,  G11B7/2585

Abstract: PURPOSE: To provide an optical recording carrier based on a phase exchange medium capable of assuring the high safety of regions where a memory layer has the information of different degrees of crystallization in spite of rapid erasability and solving the problems of the sufficient corrosion resistance of the recording carrier, the decay of signals and a poor signal-to-noise ratio by self-erasing. CONSTITUTION: This recording carrier has at least three states of different optical behaviors which are reversibly changeable over each other. At least, the three states of the different optical behaviors have the different capacity components of the crystal phase and the amorphous phase in the memory layer. The difference in the reflectability between, at least, one pair of the state is larger than in the case of between the amorphous state and the crystal state.

公开(公告)号：JPH03150188A

公开(公告)日：1991-06-26

申请号：JP18817590

申请日：1990-07-18

Applicant: BASF AG

Inventor： SHIYUTEFUAN IZERUBORUN ,  HARUTOMUUTO HIBUSUTO ,  HAARARUTO KUPERUMAIYAA

IPC: B41M5/26 ,  C01B19/04 ,  G11B7/24 ,  G11B7/243 ,  G11B7/253 ,  G11B7/2534

Abstract: PURPOSE: To directly form a record layer without providing other intermediate layer on a conventional carrier by constituting the record layer formed with void by altering a part to be illuminated of optical characteristics of the layer by laser emitting by a thermodynamically metastable alloy of a structure GeTex . CONSTITUTION: The optical recording medium is formed of a carrier material and a record layer formed on the material, and of a void by altering a part to be illuminated of optical characteristics of the record layer by a laser emitting. The record layer is constituted by a thermodynamically metastable alloy of a structure GeTex (wherein x is a thickness of a numeric value of 1.8 to 2.2) with the thickness of 10 to 100 nm. The record layer is formed of an alloy of GeTe2 or in some cases of an alloy containing other metal element. In view of a standpoint of contact resistance, a selenium of an amount not exceeding 10 At.% of small amount can be added. The medium is simply manufactured, information reproducing void is stably formed in a wide intensity range of an incident light, and further high reflectivity of 20% or more is exhibited, and hence high signal-to-noise ratio is provided.

公开(公告)号：JPH03100938A

公开(公告)日：1991-04-25

申请号：JP23600790

申请日：1990-09-07

Applicant: BASF AG

Inventor： SHIYUTEFUAN IZERUBORUN ,  KURAUSU HARUTO ,  HARUTOMUUTO HIBUSUTO

IPC: G11B7/00 ,  G11B7/005 ,  G11B7/0055 ,  G11B7/24

Abstract: PURPOSE: To obtain a high contrast by forming a recording medium in such a manner that the reflection contrast of the light polarized perpendicularly to an incident surface is larger than 0.5 and the sum of the reflection capability to the light polarized parallel and perpendicular thereto is at least 8%. CONSTITUTION: A Te70 Ge30 layer of a memory layer and an SiO2 layer which is a transparent layer are formed on a glass substrate. The reflection contrast in the wavelength of incident light to the light polarized perpendicularly to the incident surface is larger than 0.5. Namely, the component polarized perpendicularly to the incident surface hardly reflects or does not reflect at all at either of two changeover states. Simultaneously, the component polarized parallel therewith still reflects powerfully and, therefore, only the parallel polarization component or the sum of the parallel and perpendicular polarization components is usable for maintaining ordinary focusing and tracking control servo functions.