Abstract: The invention relates to an optical data recording method which comprises addressing a recording device using an infra-red laser modulated with a waveform of the information to be recorded, wherein said recording device comprises an infra-red absorbing material and a photochromic fulgide which is converted into its colored form under the influence of the heat absorbed from the laser, and updating the recording by erasing undesired previously recorded data using a laser operation in the visible region of the spectrum.

Abstract: A method for producing a negative image by coating a substrate with a photosensitive layer containing a blocked hydrophobic polymer capable of deblocking in the presence of an acid, and an oxime sulfonate ester or o-quinone-4-sulfonyl-containing diazide, then imagewise exposing, treating with a gaseous base, removing excess base, overall flood exposing, baking and developing with an aqueous alkaline solution.

Abstract: A dye-donor element for laser-induced thermal dye transfer comprising a support having thereon a dye layer and an infrared-absorbing material which is different from the dye in the dye layer, and wherein the infrared-absorbing material is an indene-bridged-polymethine dye. In a preferred embodiment, the indene-bridged-polymethine dye has the following formula: ##STR1## wherein: R represents a substituted or unsubstituted alkyl or cycloalkyl group having from 1 to about 6 carbon atoms or an aryl or hetaryl group having from about 5 to about 10 atoms; R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 each independently represents hydrogen, halogen, cyano, alkoxy, aryloxy, acyloxy, aryloxycarbonyl, alkoxycarbonyl, sulfonyl, carbamoyl, acyl, acylamido, alkylamino, arylamino or a substituted or unsubstituted alkyl, aryl or hetaryly group; or any two of said R, R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.

Abstract: Supersensitization of silver halide emulsions is effected by the addition of a metal chelating agent after chemical sensitization or a combination of phenylmercaptotetrazoles and a metal chelating agent to a spectrally sensitized emulsion. The contrast of the emulsion may also be increased by the addition of this combination of materials after chemical and spectral sensitization.

Abstract: A photographic recording material which has at least one silver halide emulsion layer containing gelatine, at least one protective layer and at least one hardening layer and in which the protective layer is further removed from the layer support than any silver halide emulsion layer and the hardening layer is further removed from the layer support than any other layer and contains an effective quantity of at least one instant hardener will have improved stability in storage under moist, warm conditions if the protective layer contains an effective quantity of at least one azaindene.

Abstract: A silver halide photographic material comprising a support having thereon at least one silver halide emulsion layer spectrally sensitized by at least one adsorptive spectral sensitizing dye, wherein the emulsion layer or a hydrophilic colloid layer adjacent to the emulsion layer contains at least one compound represented by following formula (I), (II), or (III); ##STR1##A.sub.2 --Time.sub.1).sub..sbsb.t.sbsb.1 X (II)A.sub.3 --Time.sub.2).sub.t.sbsb.2 Y (III)(all the symbols of which are defined in the specification) are disclosed.

Abstract: A medium for image formation which comprises a monomolecular film or monomolecular built-up film of a metal chelate compound and a process for image formation which comprises (1) manipulating the adsorption of a gas on a metal chelate compound and the desorption of the gas therefrom or (2) reducing metal ions in molecules of a metal chelate compound.

Abstract: A silver halide photographic material comprising a silver halide emulsion layer containing (1) a pyrazoloazole magenta coupler, (2) an anti-color-fading agent having an oxidation potential (Eox) of 0.95(V)<Eox<1.50(V) and (3) a hydroquinone derivative.

Abstract: Naphtholactamtrimethine dyes useful in optical recording media have the formula ##STR1## where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are identical or different and each is independently of the others C.sub.1 -C.sub.22 -alkyl, which may be substituted and/or interrupted by one or more oxygen atoms, one or more imino groups or one or more C.sub.1 -C.sub.4 -alkylimino groups, or is substituted or unsubstituted C.sub.5 -C.sub.7 -cycloalkyl or substituted or unsubstituted phenyl, and the rings A, B, C and D may each be substituted and/or benzofused.

Abstract: Recording in which a recording double layer which has an absorbing dye is exposed to laser light of a higher and a lower energy level, in which by exposure to laser light of the lower energy level, a bump is formed in the recording layer and in which by exposure to laser light of the higher energy level a bulge is formed which at the surface comprises a groove, as well as a recording element obtained by using the method and a method of manufacturing a metal copy from the recording element.

Abstract: An optical information recording medium for carrying out recording, readout or erasing with layer beams, which comprises a support having carried thereon at least one compound represented by the general formula (I): ##STR1## wherein R.sup.1 and R.sup.2 independently represent substituted or unsubstituted alkyl groups, or substituted or unsubstituted aryl groups, Z represents an atomic group for forming a substituted or unsubstituted aromatic ring, and L represents a linking group for forming a carbocyanine.The present optical information recording media have an excellent recording performance and stability, and dyes used therein have no explosive property and thus can safely and readily be prepared.

Abstract: Compounds of the formula ##STR1## where A represents the atoms necessary to complete a benzoxazole or naphthoxazole ring which is optionally substituted, R.sub.1 and R.sub.2 are each alkyl, hydroxyalkyl or alkoxy alkyl groups wherein the alkyl moiety comprises 1 to 4 carbon atoms, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 are each hydrogen atoms or alkyl groups having 1 to 4 carbon atoms or phenyl groups, and X is an anion.

Abstract: A silver halide photographic material comprising a pyrazolotriazole coupler represented by the following Formula I and a stabilizer represented by the following Formula VIII. ##STR1## The substituents are as defined in the specification.

Abstract: A silver halide color photographic material is described which is to be processed by a scheme including at least the step of development with a color developer having a pH of at least 11 wherein said material contains a specific pyrazoloazole based magenta coupler and a compound that react with the oxidized product of a color developing agent and which substantially lacks the ability to impart an image density. The color photographic material is improved in granularity and color reproduction and yet permits efficient desilvering.

Abstract: Novel 1H-pyrazolo[3,2-c]-s-triazole dye-forming couplers containing in the 3-position a tertiary carbon group enable more extensive development of silver halide images in photographic silver halide materials and enable preparation of improved dispersions in photographic silver halide materials because of reduced tendency to form crystals. These couplers are useful in photographic silver halide materials and processes.

Abstract: A silver halide light-sensitive photographic material comprising a support and, provided thereon, at least one silver halide emulsion layer containing a dye-forming coupler of Formula [I]: ##STR1## wherein R.sub.1 is an alkyl group or a cycloalkyl group; R.sub.2 is an alkyl group, a cycloalkyl group, an acyl group or an aryl group; R.sub.3 is a group which is substituted to a benzene ring; n is an integer of zero or 1; R.sub.4 is an organic group containing one linkage group containing a carbonyl unit or a sulfonyl unit; J is a ##STR2## wherein R.sub.5 is a hydrogen atom, an alkyl group, an aryl group or a heterocyclic group; and X.sub.1 is a group capable of being split off upon reaction with the oxidation product of a color developing agent.

Abstract: A method of producing a silver halide photographic emulsion including the step of:reacting a water-soluble silver salt and at least one water-soluble halide salt containing chloride in aqueous solution in the presence of at least one compound represented by formulae (I) or (II): ##STR1## wherein A.sub.1, A.sub.2, A.sub.3 and A.sub.4, which may be the same or different, each represents a nonmetallic atomic group necessary for forming a substituted or unsubstituted heterocyclic ring; B represents a divalent linking group; R.sub.1 and R.sub.2, which may be the same or different, each represents an alkyl group; X represents an anion necessary for charge balance; m is 0 or 1; and n is 0 or 1;to form light-sensitive silver halide grains having a silver chloride content of at least 50 mol %, selected from octahedral grains, tetradecahedral grains and tablular grains, wherein at least 30% of the surface area of said light-sensitive silver halide grains is composed of (111) planes.

Abstract: The present invention provides silver halide color photographic materials having a layer which contains at least one magenta color image-forming oleophilic coupler of the following formulae (I) and/or (II) and at least one of the following formula (III): ##STR1## in which Ar represents a phenyl group which is substituted by at least one substituent selected from the group consisting of a halogen atom, an alkyl group, an alkoxy group, an alkoxycarbonyl group and a cyano group; Y represents an acylamino group or an anilino group; and Z.sub.1 represents a group capable of being removed by coupling, ##STR2## in which X represents a hydrogen atom or a substituent; Z.sub.2 represents a hydrogen atom or a group capable of being removed by coupling;W represents a hydrogen atom, an acyl group or an aliphatic or aromatic sulfonyl group;Za and Zb each represent a methine group, a substituted methine group or --N.dbd.; andX, Z.sub.

Abstract: The present invention relates to a method of stabilizing an organic base substance having an absorption mixture in the range of from about 300 nm to about 200 nm, against light, by combining the organic substance and at least one complex of formulae (I), (II) or (III): ##STR1## in which each of R.sup.1 to R.sup.5, R.sup.10 to R.sup.14 and R.sup.17 to R.sup.21, each of which may be the same or different within an individual compound, represents a halogen atom, a hydrogen atom, or an alkyl, aryl, cycloalkyl or heterocyclic group which is bonded to the carbon atom on the benzene ring directly or indirectly via a divalent linking group, and these may be same or different and the adjacent substituents may be bonded together to form a ring;R.sup.6 and R.sup.7 each represents an alkyl group or an aryl group, and these may be the same or different;R.sup.8, R.sup.9, R.sup.15, R.sup.16, R.sup.22 and R.sup.

Abstract: This invention relates to an optical recording medium characterized by high sensitivity, high stability, etc, and a process for making the optical recording medium. Specifically, the present invention provides an optical recording medium composed of a transparent substrate having prepits and/or pregrooves for system control signals and first and second recording layers formed thereon in order, the both layers having individually a specific reflectance, transmittance and absorbance. To the optical recording medium, a laser beam is irradiated on the transparent substrate side to record or read out information and, by detecting the variation of the amount of light as a sum of the reflected light from the boundary between the first recording layer and the substrate and the reflected light from the boundary between the second recording layer and the air, the system control signals are primarily obtained from the prepits and/or pregrooves.