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公开(公告)号：JPH03264391A
公开(公告)日：1991-11-25
申请号：JP28740190
申请日：1990-10-26
Applicant: BASF AG
Inventor： ZUIBIRE BUROZUIUSU , KAARUUHAINTSU FUOIERUHERUTO , URURITSUHI HARUTEN , MIHIYAERU SHIYUMITSUTO , KURAUSU DEIITAA SHIYOOMAN , HAARARUTO KUPERUMAIYAA
Abstract: PURPOSE: To improve continuous reading durability and fading stability by incorporating a carrier material, and a light absorbing layer formed of a soluble mixture of a thermoplastic binder and a dye, and using specific soluble phenol- aldehyde co-condensate as the binder. CONSTITUTION: The optical recording medium comprises a carrier material, and a light absorbing layer formed of a soluble mixture of a thermoplastic binder and at least one type of dye. As the binder, a soluble phenol-aldehyde co-condensate having an average polymerization degree larger than 40 and containing 0.05 to 5% of unreacted phenol constituent is used. Since the polymer made of a novolac exhibits good compatibility with the dye, the absorbing layer can be made to a sufficiently thick layer by a spin coating method of easy treatment, and hence good signal to noise ratio is performed. The medium in which weather resistance and continuous reading durability of the dye-polymer layer are improved can be provided by the polymer.
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Patent Agency Ranking2.发明专利
公开(公告)号：JPH03125332A
公开(公告)日：1991-05-28
申请号：JP26657590
申请日：1990-10-05
Applicant: BASF AG
Inventor： KURAUSU DEIITAA SHIYOOMAN , PEETAA HAMERUSHIYUMITSUTO , ZUIBIRE BUROZUIUSU , KAARUUHAINTSU FUOIERUHERUTO
IPC: G11B7/00 , G11B5/41 , G11B5/54 , G11B7/004 , G11B7/005 , G11B7/085 , G11B11/105 , G11B19/04 , G11B19/06 , G11B33/14
Abstract: PURPOSE: To prevent scanning errors capable of fedbacking by wear by newly positioning a laser light irradiating focus in a shift track after information reading and then return-positioning the same in a newly used track. CONSTITUTION: When a laser light irradiating focus is directed to a track longer than a usual reading time, information is read by an output laser light sufficiently high not to change the information and the laser irradiation focus is maintained after information reading. Then, after the laser light irradiation focus is positioned in a shift track, return-positioning is positioned in a newly used track. That is, after reading of a first track by a laser light is finished, a switch device OS is actuated by a command signal and switched to the shift track via a transfer controller OP, and the laser irradiation is focused by a servo control switch device OR, and thus the change or damaging of the information is prevented.
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公开(公告)号：JPH0230589A
公开(公告)日：1990-01-31
申请号：JP14551589
申请日：1989-06-09
Applicant: BASF AG
Inventor： ZUIBIRE BUROZUIUSU , HERUMUUTO BARUTSUINSUKII , KAARUUHAINTSU FUOIERUHERUTO , BUORUFUGANGU SHIYUROTSUTO , BERUNHARUTO ARUBERUTO , MIHIYAERU ATSUKAA , KURAUSU DEIITAA SHIYOOMAN , HAARARUTO KUPERUMAIYAA , MIHIYAERU SHIYUMITSUTO
Abstract: PURPOSE: To suppress a crystallization of a dye by using a phenol/aldehyde resin having a specific mean molecular weight soluble in an alcohol having a boiling point of a predetermined range as a thermoplastic binder of a light- absorbing layer, thereby improving a dye solubility and forming a higher density. CONSTITUTION: A phenol/aldehyde resin used for a carrier of the optical recording medium is obtained by a reaction of multifunctional phenol soluble in an alcohol having a lower boiling point than 200 deg.C with the formaldehyde. Its mean molecular weight is larger than 300. As the phenol, phenol itself or a compound represented by a formula is used solely or in the state of a mixture thereof. As the aldehyde, a formaldehyde, a formaldehyde decomposed compound, acetaldehyde, chlorinated acetaldehyde, acetal or semi-acetal is used. This resin exhibits a good compatibility with the dye. And the light-absorbing layer containing the dye and the resin is formed in a sufficient density to suppress a crystallization of the dye.
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公开(公告)号：JPH02293183A
公开(公告)日：1990-12-04
申请号：JP9418090
申请日：1990-04-11
Applicant: BASF AG
Inventor： ZUIBIRE BUROZUIUSU , BERUNHARUTO ARUBERUTO , MIHIYAERU SHIYUMITSUTO , KURAUSU DEIITAA SHIYOOMAN , HAARARUTO KUPERUMAIYAA , URURITSUHI HARUTEN
Abstract: PURPOSE: To improve a mechanical stability by providing a light absorbing layer containing a thermoplastic binder made of a polycyclic hydrocarbon of a specific composition and one or more types of dye, and forming an optical recording medium, thereby suppressing a crystal of the layer. CONSTITUTION: A light absorbing layer containing a thermoplastic binder made of a polycyclic hydrocarbon soluble in a content of 3 wt.% or more in the case of an aliphatic hydrocarbon and an aromatic hydrocarbon and having a glass transition temperature of 150 deg.C or higher and one or more types of dye is provided on a support to form the optical recording medium. The polycyclic hydrocarbon of a unit represented in a content of 80% or more by a formula I (wherein n is an integer of 10 to 1,000, R , R to R , R10 are each independent from each other a hydrogen atom and/or 1-3C alkyl group) is preferable.
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6.发明专利
公开(公告)号：JPH02117964A
公开(公告)日：1990-05-02
申请号：JP22762689
申请日：1989-09-04
Applicant: BASF AG
Inventor： BERUNHARUTO ARUBERUTO , PEETAA NOIMAN , ZUIBIRE BUROZUIUSU
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