 Digital information recording media and method of using same |
| OF THE INVENTION The present invention relates in general to a light-stable colorant system that ... |
|
| Method for tagging thermoplastic materials with near infrared fluorophores |
| This invention relates to a method for "marking" or "tagging" a thermoplastic polymeric material by ... |
|
| Insulation system |
| The object of the present invention is therefore to provide an insulation system of the above type ... |
|
| Epoxy-sulfonamide compounds and compositions |
| What is claimed is: 1. The reaction product of an aryl sulfonamide compound selected from the group ... |
|
| Optical quality polycarbonates with reduced static charge and method for making same |
| OF THE INVENTION Polycarbonate resins are prepared in a melt process by the reaction of a diaryl ... |
|
| Optical data storage compact disc and method for manufacturing the same |
| OF THE DRAWING AND PREFERRED EMBODIMENTS Referring to the drawings, there is shown an optical data ... |
|
| Optical pickup device |
| It is an object of the present invention to provide a more simplified and minimized optical pickup ... |
|
| Photosensitive composition |
| What is claimed as new and intended to be covered by Letters Patent of the United States is: 1. A ... |
|
|
Optical information recording medium
| Details |
Inventors: Hamada, Emiko; Arai, Yuji; Shin, Yuaki; Ishiguro, Takashi;
Assignee: Taiyo Yuden Co., Ltd. (Tokyo, JP)
Primary Examiner: Shoop, Jr.; William M.
Assistant Examiner: Martin; David
Attorney, Agent or Firm: Oblon, Spivak, McClelland, Maier & Neustadt
An optical information recording medium comprising a light transmitting substrate, a light absorptive layer overlaying the substrate to absorb a laser beam and a light reflective layer overlaying the light absorptive layer, wherein an optical parameter represented by .rho.=n.sub.abs d.sub.abs /.lambda. where n.sub.abs is the real part of the complex refractive index of the light absorptive layer, d.sub.abs is the thickness of the light absorptive layer and .lambda. is the wavelength of a reading laser beam, is 0.05.ltoreq..rho..ltoreq.0.6, and the imaginary part k.sub.abs of the complex refractive index of the light absorptive layer is at most 0.3. |
|
DETAILED DESCRIPTION What is claimed is: 1.
An optical information recording medium comprising a light transmitting substrate, a light absorptive layer having a complex refractive index comprised of a real part of said complex refractive index (n.
sub.
abs) and an imaginary part of said complex refractive index (k.
sub.
abs), said absorptive layer having a thickness (d.
sub.
abs), said light absorptive layer overlaying the substrate to absorb a laser beam and a light reflective layer overlaying the light absorptive layer, wherein an optical parameter represented by .
rho.
=n.
sub.
abs d.
sub.
abs /.
lambda.
where .
lambda.
is the wavelength of a reading laser beam, meets the inequality 0.
05.
ltoreq.
.
rho.
.
ltoreq.
0.
6, and the imaginary part k.
sub.
abs of the complex refractive index of the light absorptive layer is at most 0.
3.
2.
The optical information recording medium according to Claim 1, wherein the light absorptive layer comprises a cyanine dye, and the light reflective layer is made of a metal film.
3.
The optical information recording medium according to claim 2, wherein the cyanine dye is indodicarbocyanine.
4.
The optical information recording medium according to claim 1, wherein the light absorptive layer contains a material which, upon absorption of a laser beam by the light absorptive layer, undergoes a temperature rise and, at a temperature of from 100.
degree.
to 600.
degree.
C.
, undergoes an exothermic reaction with generation of a gas.
5.
The optical information recording medium according to claim 1, wherein n.
sub.
abs is n.
sub.
abs .
gtoreq.
1.
8, and k.
sub.
abs is 0.
001.
ltoreq.
k.
sub.
abs .
ltoreq.
0.
3.
6.
The optical information recording medium according to claim 1, wherein the real part n.
sub.
ref of the complex refractive index of the light reflective layer and the imaginary part k.
sub.
ref of the complex refractive index of the light reflective layer satisfy a relation of k.
sub.
ref .
gtoreq.
2n.
sub.
ref +0.
8.
7.
The optical information recording medium according to claim 1, wherein an enhancing layer which is transparent to the wavelength of the reading laser beam is disposed between the light absorptive layer and the light reflective layer
|
| Related patents |
|
|
Optical recording disk
Therefore, an object of the invention is to provide a novel and improved optical recording disk having a dye base recording layer which disk is less expensive and highly ...
|
|
|
Directed energy assisted in vacuo micro embossing
OF PREFERRED EMBODIMENTS FIG. 1. shows a diagram of one possible configuration of the embossing machine/station. A drum 1 and pressure roll(s) 2, 3 confine a web (roll ...
|
|
|
Method for preparing poly-N-alkenylamines
We claim: 1. A method for preparing thermoplastic poly-N-alkenylamines having the general formula ##EQU2## where A is a tertiary heterocyclic amine, connected to the ...
|
|
|
Polymeric Schiff's bases containing acetylene terminal groups
OF THE INVENTION It has been discovered that acetylene-substituted Schiff's bases can be prepared from the reaction of acetylene-substituted amines and ...
|
|
|
Physically optimized optical disc structure, method and apparatus
The present invention provides structures, methods and apparatus which are useful both in coping with demanding real-time applications of the type mentioned above and in ...
|
|
|
Polycarbonate from carbonyl halide, bischloroformate and dihydric phenol
What is claimed is: 1. High molecular weight thermoplastic aromatic polycarbonate exhibiting improved processability consisting essentially of at least one recurring ...
|
|
|
Optically isotropic devices
OF THE INVENTION As indicated above, in many optical devices it is important that optical clarity and uniformity be achieved. For example, in such uses as optical disks ...
|
|
|
Optical recording disk
An object of the present invention is to suppress the appearance of wrinkles of a UV-cured resin surface, thereby to provide an optical recording disk of high C/N ratio ...
|
|
|
Arm socket and attached hand prosthesis
In view of the above, it is an object of the present invention to provide an arm socket that is easy to put on and that can be fitted by the user to changes in the shape ...
|
|
|
Method for detecting and separating thermoplastic containers with near infrared fluorosphores
This invention relates to a method for "marking" or "tagging" a thermoplastic polymeric material by incorporating one or more thermally stable, near infrared fluorescing ...
|
|
|
Manufacturing Materials 
