Classifications

• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
  • G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
  • G03C5/26—Processes using silver-salt-containing photosensitive materials or agents therefor
  • G03C5/32—Latensification; Densensitisation
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
  • G03C1/00—Photosensitive materials
  • G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
  • G03C1/06—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with non-macromolecular additives
  • G03C1/08—Sensitivity-increasing substances
  • G03C1/10—Organic substances
  • G03C1/12—Methine and polymethine dyes

Definitions

• the process of this invention comprises (a) exposing to image-forming radiation containing radiation in the region of normal sensitivity of a silver halide photographic emulsion and/or in the region of extended sensitivity con-- ferred by the presence of an optical sensitizing dye, a washed, light-sensitive colloid-silver halide emulsion layer having an average grain size of 0.1 to 10 microns containing (l) 0.5 to 120 mole percent of a water soluble stannous salt, (2) a sensitizing amount of an optical sensitizing dye taken from the group consisting of eyanine, pseudocyanine, .car'bocyani'n'e and merocyaninedyes capable of extending the sensitivity of a silver bromide emul-' sion from the normal blue region to at least one of the green, red and infrared regions of the spectrum, and having added thereto (3) at least one water-soluble halide taken from the group consisting of lithium, sodium, po-
• bromide and iodide in an amount sufficient to provide an excess of halide ions over that necessary initially to pre--' ing the latensified element by exposing it to actinic light (i.e., radiation containing wavelengths from 3000 to 5000 A.) having an intensity less than the exposing radiation (a) for a period of at least 1 second.
• actinic light i.e., radiation containing wavelengths from 3000 to 5000 A.
• a period of 1 second gives an adequate visible image.
• Any photographic silver halide emulsion layer or elements embodying such a layer disclosed in application Ser. No. 117,805 can be used in the process. of this invention.
• the exposure step (a) can be carried out for about 0.01 to about 10,000 microseconds.
• the coated materials were tested by using a Mark HI, Edgerton, Germenshausen Grier, Inc. electronic flash sensitometer similar to that described by Wyckotf and Edgerton, Journal of the Society of Mot-ion Picture and Television Engineers, 66, 474 (1957).
• This instrument uses a xenon discharge tube as a source of radiation. The exposure time was 10- seconds.
• the radiation was modulated with a x/i step tablet of 21 steps in the density range of 0.05 to 3.05.
• the latent image formed was latensified by yellow light attained by a yellow Wratten No. -8 filter modulation of white -watt fluorescent lights at 5 0 foot-candles intensity for a period of 5 seconds. Photo-development was then accomplished by removing the yellow filter and exposing the latensified element to white light -for a period of several minutes to obtain maximum image density.
• the latensified images may also be liquid-developed, stabilized and fixed.
• the instant invention will be illustrated but is not intended to be limited to, the following detailed examples.
• Example I and 30 mole percent excess bromide ions,-all based on.
• step 18 of the step wedge is made visible by the white light exposure with the latensification step.
• Example II Example II was repeated except that the emulsion contained 100 milligrams of the optical sensitizing dye: 3,3- diethyl-9-methyl benzothiazole carbocyanine p-toluene sulfonate per mole of silver halide. All exposure conditions were carried out as described in Example I with the following results.
• the optical sensitizing dye 3,3- diethyl-9-methyl benzothiazole carbocyanine p-toluene sulfonate per mole of silver halide. All exposure conditions were carried out as described in Example I with the following results.
• Example III Example. I was repeated except that the emulsion contained 100 milligrams of the optical sensitizing dye: 5,5-
• Example IV Example IV was repeated except that the emulsion contrimethyl-3,3'-diethyl benzothiazole carbocyanine iodide. All exposure conditions were the same as those described in Example I with the following results:
• ExampleV Example I was repeated except that the emulsion contained 100 milligrams of the optical sensitizing dye: 5,5- diphenyl-9-methyl-3,3 diethyl benzoxazole carbocyanine iodide per mole of silver halide. All conditions of exposure were the same as described in Example I with the following results.
• Example VI Example I was repeated except that the emulsion contained I00 milligrams of the optical sensitizing dye: 5- n1cthyl-3,l'-diethyl-2,2'-selenopseudocyanine iodide per mole of silver halide. All conditions of exposure were the same as described in Example I with the following results.
• Example VII Example VII Example I was repeated except that the emulsion contained milligrams of the optical sensitizing dye: 5,5- dimethyl-3,3',9-triethyl benzothiazole carbocyanine iodide per mole of silver halide. All conditions of expo sure werethe same as described in Example I with the following results.
• Example VIII Example I was repeated except that the emulsion contained 100 milligrams of the optical dye: 5,5- dimethyl 9 -j phenyl 3,3 diethyl benzothiazole earbocyanineiodide per mole ofsilver halide. All conditions of exposure were the sameas described in Example I with the'following results.
• Example IX Example I was repeated except that the emulsion contained 50'milligrams of the merocyanine opticalsensitizing dye: 3 ethyl 5 [1- ethyl 2(1) benzoxazolidene-isopropylidene] 2 thio 2,4 oxazoledione. All exposure conditions were the same as those described in Example I with the following results.
• Example-3' Example I was repeatedexcept that'theemulsioncontained 100 milligrams of the optical-sensitizing dye: 3- I n butyl 5 (3' ethyl- 2 thiazolidene ethylidene) rhodanine. All condition of exposurewere the same as those described inExample-I withthe followingresults.
• Example XII Example XI was repeated except that one mole percent of plumbous nitrate had been incorporated into the emulsion. All exposure conditions were the same as in Example I with the following results.
• Example XIII Example XH was repeated except that mole percentwas exposed to a 10" second xenon dash in thefl sensitomete r behind a neutral density fllter ot 1.3 in place of the V2 step wedge. The exposed material was then exposed for 5 and 60 seconds through a Wratten No. 47 blue filter, a Wraten No. 58 green filter or a Wratten No. 25 red filter I to light of varying intensity as shown in the tables below.
• the material was then photodeveloped by exposing to-a white fluorescent light of 40-foot candles intensity for minutes. The results were determined by reading the.
• Example I the Wratten No. 25 red filter which transmits very effi-' of stannous chloride was added in the manner described .in Example I and an excess. of 64 mole percent ofbromide ion was added. The exposure operations were the same as described, in Example I with the following results.
• Example XIV Example I was repeated except that the emulsion contained 200. milligrams of the optical sensitizing dye disclosed there instead of 100 milligrams per mole of silver halide. All conditions of exposure were the same as described in that example with the following results.
• ExampleXV An emulsion as described in Example I but containing 160 milligrams per mole of silver halide of the optical sensitizing dye described in Example II was tested to show the efiect of varying the time of latensification through the K-2 filter. The exposure and photodevelopment times and conditions remained the same as in Example I. The results are as follows:
• Example X VI The photographic element described in Example I ciently light above 6000 A.
• Foot-candles of intensifying 'Latenslficatlon time-5 seconds light helm-nagging through I Fog White 'Blue Green Red .25 .32 .29 .32 .35 .20 .33 .32 .35 .37 .25 .35 ,a0 .32 .se
• filters may be used for the latensifying'step such as any minus blue filter and those which are minus blue and transmit efiiciently, radiation in the region where the particular optical sensitizing dye confers the greatest amount of spectral response to the emulsion.
• the process of the invention offers several advantages. By being able to latensify the latent images in the manner taught by the invention a much lower energy image exposure is possible or by thesame token, a much higher effective speed is obtainedfrom high intensity exposures. In the former case, one could for instance expose the elements to electroluminescent panels and then by the instant process produce a suitable image. In the latter case, say'for oscillographic use the writing speed can be increased by about 150%. In other words the density of the image normally obtainable without latensification can be increased or more.
• a process' which comprises (a) exposing to image-forming radiation containing radiation in at least one of the regions'of normal sensitivity of a silver halide photographic emulsion and of extended sensitivity conferred by the presence of an optical sensitizing dye, a washed, light-sensitive colloid-silver halide emulsion layer having, lightdevelopable, direct-writing characteristics and an average grain size of 0.1 to 10 microns containing infrared regions of the spectrum, and having I added thereto (3) at least one water-soluble halide taken from the group consisting of lithium, sodium, potas 7 sium, calcium, magnesium and ammonium chloride, bromide and iodide in an amount sufficient to provide an excess of halide ions over that necessary initially'to precipitate all of the silver as silver halide, v
• step (b) latensifying the element resulting from the image exposure of step (a) by irradiating said element for about 1 to about 60 seconds with light radiation in the region of greatest response in the region of extra sensitivity conferred to the silver halide emulsion by said dye, and
• step (c) is carried out with radiation of 50 foot-candles at a temperature of 200-300 F.

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• Physics & Mathematics (AREA)
• Chemical & Material Sciences (AREA)
• General Physics & Mathematics (AREA)
• Spectroscopy & Molecular Physics (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Silver Salt Photography Or Processing Solution Therefor (AREA)
• Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
• Plural Heterocyclic Compounds (AREA)
• Heterocyclic Carbon Compounds Containing A Hetero Ring Having Nitrogen And Oxygen As The Only Ring Hetero Atoms (AREA)

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Citations (7)

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• 0
  • BE BE622340D patent/BE622340A/xx unknown
• 1961
  • 1961-09-12 US US137534A patent/US3183088A/en not_active Expired - Lifetime
• 1962
  • 1962-09-06 GB GB34220/62A patent/GB967768A/en not_active Expired
  • 1962-09-11 DE DEP1267A patent/DE1267976B/de active Pending

Patent Citations (7)

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