Abstract: A color sheet comprising; a flexible substrate or film; and a dye layer formed on the substrate including a sublimating dye of yellow, magenta or cyan and a near infrared absorbing pigment with a near infrared absorption without a substantial visible absorption.A color transfer method comprises the steps of: preparing a color sheet above mentioned; abutting the dye layer of the color sheet onto an image receiving sheet to be printed; and irradiating an optical laser beam to the dye layer, the laser beam having a wavelength in the near infrared region absorbed by the near infrared absorbing pigment, whereby a light energy absorbed by the near infrared absorbing pigment is converted into a heat energy thereby sublimating the sublimating dye and transferring the sublimated dye onto the image receiving sheet arranged so as to face the dye layer.As a result, a recording speed and a resolution are remarkably improved with the color sheet and the color transfer method using it.

Abstract: An optical recording medium comprises a light transmissive substrate, a light absorption layer provided on the light transmissive substrate and a light reflecting layer provided on the light absorption layer. The light absorption layer contains a cyanine type dye represented by a following structural formula: ##STR1## and a quencher represented by a following general formula: ##STR2## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 denote hydrogen or substituent group, respectively. A protective layer may be further provided on the light reflecting layer for protecting the same.

Abstract: Disclosed is an information recording medium having a recording layer which contains a benzotriazole type compound. This information recording medium therefore exhibits very excellent effects in light resistance and is safe to use.

Abstract: An optical recording medium comprises a light transmissive substrate, a light absorption layer provided on the light transmissive substrate and a light reflecting layer provided on the light absorption layer. The light absorption layer contains a cyanine type dye represented by a following structural formula: ##STR1## and a quencher represented by a following general formula: ##STR2## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 denote hydrogen or substituent group, respectively. A protective layer may be further provided on the light reflecting layer for protecting the same.

Abstract: A recordable optical recording medium having a sufficiently high reflectance and modulation factor to comply with the CD specifications. The light-absorbing layer in the optical recording medium has a first cyanine dye having a light absorption band in the wavelength region of recording or reproducing light, and a second cyanine dye having a light absorption band in the wavelength range shorter than the first cyanine dye and having a smaller light absorption in the wavelength region of recording or reproducing light. The second cyanine dye is contained in the light-absorbing layer in an amount larger than the first cyanine dye.

Abstract: A writable recording medium having reduced jitter, improved performance on repeated reproduction, improved light resistance, and sensitivity controllability is disclosed, in which a light-absorbing layer thereof contains (D-1) a cyanine dye having an absorption band in the wavelength region of light for recording or reproduction, (D-2) a cyanine dye having an absorption band in a shorter wavelength region than that of cyanine dye (D-1) and having a smaller absorption than that of cyanine dye (D-1) in the wavelength region of light for recording or reproduction, (Q-1) a quencher for preventing photo-deterioration of cyanine dyes, and (Q-2) a quencher selected from an azo compound and a diphenylamine compound, the weight ratio of cyanine dye (D-2) to cyanine dye (D-1), taken as .alpha., being from 1 to 3, the weight ratio of quencher (Q-1) to quencher (Q-2), taken as .beta., being from 0.

Abstract: An optical recording medium having at least a pair of recording films which have a predetermined light absorption distribution and have steep absorption end slopes which are closer to each other. The difference between the wavelengths of recording or reproduction lights for these two recording films may be close to about 50 nm. A common optical system may be used for recording or reproduction operation for the two recording films, whereby the optical system may be simplified.

Abstract: An optical recording medium having a recording film which comprises a phthalocyanine type coloring matter and a light absorbing agent having an absorption in the wavelength region corresponding to the laser recording wavelength.Such an optical recording medium is excellent in light resistance, is capable of providing a clear pit having a neat configuration at the time of recording and is capable of providing a sufficient reproduction characteristic.

Abstract: Disclosed is an optical recording medium having recording film containing a photochromic material and a binder, in which the photochromic material is acid anhydride of diarylethene derivative and the binder is polycarbonate. Owing to this structure, the optical recording medium can reliably keep information recorded thereon even when the information is repeatedly reproduced.

Abstract: An optical recording medium comprises a substrate and a recording layer provided on the substrate, and the recording layer contains a recording material having a property in that a difference in temperature between decomposition point of the recording material and melting point thereof is not more than 100.degree. C. In result, the recording layer is capable of forming a complete pit, and the medium has superior reproduction characteristics.

Abstract: A rewritable photochromic optical disk comprises a photochromic recording layer made of a dibenzothienyl ethene derivative, 1,2-di(2-cyano-3-benzothienyl)-1,2-dicyanoethene capable of assuming first and second states, the first state with a first absorption band transforming into the second state with a second absorption band by irradiating a first light beam of a first wavelength, and the second state transforming into the first state by irradiating a second light beam of a second wavelength in the second absorption band. This rewritable photochromic optical disk has a stability in the repeated recording and erasing information and a high thermal stability and capable of storage of information extended over a long period of time, in accordance with its higher quantum yield than that of the conventional dibenzothienyl ethene derivative so that the achromatic reaction takes place by irradiation of a low power laser beam.

Abstract: An optical recording medium, including a substrate and a recording film disposed thereon, wherein an optical shutter layer is disposed in front of the recording film with respect to the direction of an incident reading light beam or recording light beam which is to be supplied to the optical recording medium; and the optical shutter layer comprises, as a main component, a substance having a shutter property such that the substance is in a state where it develops a color thereof until the substance is irradiated with a reading light beam, but when the substance is irradiated with the reading light beam, the substance irradiated with the reading light beam is heated up over a certain temperature so that the substance is decolored and a central portion of the optical shutter layer irradiated with the reading light beam is caused to have a light transmission.

Abstract: An optical recording medium, comprising: a light transparent substrate, a light absorbing layer disposed on the light transparent substrate, a light reflection layer disposed on the light absorbing layer, and a protection layer disposed on the light reflection layer, wherein the protection layer has been formed by curing a photo-setting resin which is capable of providing a glass transition point of not lower than 110.degree. C., a shrinkage factor of not larger than 8%, and a water vapor permeability of not higher than 110 g/m.sup.2 .multidot.24 H after being cured. The optical recording medium having the above structure is capable of showing stable performances, even in an environment of high humidity.

Abstract: When information recording is conducted by converting a non-colored state of a recording film into a colored state, use is made of a recording light having a wavelength in such a range that an absorbance of the non-colored state is higher than an absorbance of the colored state. When information erasing is conducted by converting a non-colored state of a recording film into a colored state, use is made of an erasing light having a wavelength in such a range that an absorbance of the non-colored state of the recording film is higher than an absorbance of the colored state. Accordingly, the present invention has the advantage of a great change of color being exhibited in the recording film, thus enabling optimal recording and erasing of information.

Abstract: A write once read many type optical disc comprises a light transmissive substrate having a tracking groove formed therein, a light absorbing layer disposed on a surface of the substrate on which the tracking groove is formed, and a light reflection layer disposed on the light absorbing layer, wherein an RMI value defined by the following formula is not lower than 0.22: RMI value=(I.sub.l -I.sub.g)I.sub.o, wherein I.sub.l denotes an electric potential at a land portion, I.sub.g denotes an electric potential at a groove portion, and I.sub.o denotes an electric potential at a mirror surface portion.When the write once read many type optical disc is caused to have a structure as described above, there may be provided the write once read many type optical disc having a good playability, i.e., the optical disc wherein the TE level may be provided assuredly on the basis of a value obtained from one beam.

Abstract: An optical recording medium comprises a light transmissive substrate, a light absorption layer provided on the light transmissive substrate and a light reflecting layer provided on the light absorption layer. The light absorption layer contains a cyanine type dye represented by a following structural formula: ##STR1## and a quencher represented by a following general formula: ##STR2## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 denote hydrogen or substituent group, respectively. A protective layer may be further provided on the light reflecting layer for protecting the same.

Abstract: A Langmuir-Blodgett (LB) film forming apparatus has a packing unit for orientating and packing a sample which is a composition for forming a monomolecular film developed on a subphase stored in a first tank, a sampling unit for sampling the orientated and packed monomolecular film on a substrate, and an outer casing enclosing the packing unit and sampling unit. The packing unit has a second tank in which a circulating solution is stored and the first tank is disposed in the solution. A temperature of the circulating solution in the second tank is controlled by a first controller and a temperature of atmosphere enclosed by the casing is controlled by a second controller. The first and second controllers are synchronously operated. The substrate is disposed above the subphase in a vertical attitude.

Abstract: An optical recording medium has a recording layer formed on a substrate possessing a light transmissive property, through which a light for recording and reproducing is irradiated to the recording layer. The substrate contains a light absorbent so as to allow only the light for recording and reproducing to pass through the substrate. The recording medium exhibits a good light-resistance.

Abstract: Disclosed herein is an optical disk comprising an elastomer layer formed on a transparent substrate and having infinitesimal bumps and depressions such as pre-addresses or pre-grooves, and a reflection retention layer which is formed on the elastomer layer and which comprises a thiophene vinylene resin having a glass transition temperature and, after curing, a high reflection factor. The reflection retention layer having high levels of affinity with polymers minimizes the possibility of its delamination from the elastomer layer. This makes it easier to form the reflection retention layer.

Abstract: A light-sensitive recording medium using a photochromic material produced at a low cost, without necessity of fixing free rotation of bonds in its cis compound and removing its trans compound, is disclosed, the recording medium comprising a substrate having thereon a recording layer which contains a photochromic material capable of cis-trans isomerization upon irradiation with light, wherein not more than 50 mol % of the photochromic material has a trans configuration when the recording layer is in a color-disappearing state.