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
  • G03C5/29—Development processes or agents therefor
  • G03C5/30—Developers
• • 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
  • G03C5/16—X-ray, infrared, or ultraviolet ray processes
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
  • Y10S430/135—Cine film
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
  • Y10S430/167—X-ray

Definitions

• This invention relates producing photographic images .of pictures on luminous screens and especially to produce X-ray cinematographic images from luminous screens and developing 5 methods and baths for making the same.
• screen images free from defects as, e. g. X-ray cinematographic images are prepared without costly apparatus by subjecting the exposure material .used to an intensive development. This is the more astonishing as the view was previously.
• a developer containing a caustic alkali may be added.
• a developer containing a caustic alkali may be added.
• a developer rich in sulphite is prepared somewhat as follows:
• a gamma value of 1.6-2.0and a fogging of 0.15 to 0.25 and, moreover, the weakest lightimpression is developed as well as possible since, furthermore, in this developer a developing time of 10-20 minutes may be employed.
• a higher gamma value can also be obtained by addition of substances increasing the gradation oi the developer. preferably such substances as are not attacked in the strongly alkaline developer.
• substances increasing the gradation ni-troor chloro-benzimidarole and chloro-benzotriazole may be particularly mentioned.
• a negative development may be carried out with films of average sensitivity (up to about 17/ 10 Din.) which preferably are suited to the luminous screen in their spectral sensitivity, and which yield fine-grained images without fogging.
• a hard acting film material has been shown to be particularly eifective.
• hard acting exposure material a material is understood which shows a harder gradation than the normal cinematographic film.
• the film material can preferably be hardened either in or after its manufacture or after the exposure or even during the development.
• an exposure material is suitable in which by intensive development the lower part of the blackening curve rises steeply with simultaneous displacement of the curve to the left.
• the gamma value should lie with development times of up to minutes'preferably above 1.5 in
• emulsions are used with a so-called tail in the gradation curve between the threshold and the beginning of the part of the curve used in photography.
• tail emulsions may have with normal exposures in certain circumstances a smaller sensitivity than other sorts; nevertheless these tail emulsionsin contrast to the general rules of photography-are preferred for the process according to the invention.
• a third possibility of producing photographic reproductions of pictures of feebly lighted objects on fluorescent screen consists in using any film material, especially such of high sensitivity,
• a developer is employed.
• a developer containing carbonate to which com-I pounds are added capable of increasing gradation and power of developing especially at the lower part of the curve of gradation, i. e. a developer capable of developing even the faintest traces of a picture in a manner being relatively rich in contrast.
• organic nitrogen compounds such as amines or their salts are suitable that, in the developersolutions used, split oil ammonia only in traces or not at all and that at the same time increase gradation.
• alkali iodides especially of potassium iodide has proved of value.
• the following developer solution may be given as an example for this type of developer:
• ethyl amine hydroiodide may be used likewise.
• alkalihydroxide may be added to the developer solution in order to increase its developing power; for, the splitting off of ammonia in such a developer takes place only very slowly.
• the amount and the kind of alkali and/or carbonate added to the developer depends on the compounds used for increasing gradation.
• the spectral sensitivity i. e. the colour sensitivity of the photographic emulsion is similar to the emission spectrum of the luminous screen or that the spectral sensitisation of the emulsion is substantially uniform in the range between violet and orange.
• X-ray screens are advantageous whose screen brightness rises with increase of X-ray energy.
• Such screens are those which with smaller energies, e. g. in diagnosis give a greater brightness which, however, with increasing energy does not increase considerably.
• a screen may be used which radiates, e. g. blue-violet light and an emulsion with a particularly high individual sensitivity for these wavelengths, which thus does not need to be specially optically sensitised.
• the working up or development of this'emulsion may then take place with orange light in a convenient manner which renders the working process particularly easy.
• This process can also be used if cinematographic images are not to be made but individual images, or small images from the luminous screen,
• a process for the preparation of photographic and cinematographic pictures which comprises providing a film having highly light sensitive exposure material thereon, exposing the same to an image on a luminous fluorescent screen and subjecting the film toan intensive alkaline developing operation, characterised in that'devel-v opers containing a high proportion of caustic alkali are used witha considerable content, approximately to the limit. of solubility, of reducing agents. f
• a process for the preparation of photographic and cinematographic pictures which comprises providing a film having highly light sensitive exposure material thereon, exposing the same to an image on a luminous fluorescent screen and subjecting the film' to an intensive alkaline developing operation, characterised in that strongly alkaline developers are used with an addition of materials raising the gradation.
• Process for the preparation of photographic and cinematographic pictures which comprises providing a film having highly light sensitive exposure material thereon, exposing the same to an image on a luminous fluorescent screen, and subjecting the film to an intensive alkaline developing operation, the exposure material being flrst subjected to an intensive development and after reversal to a development capable of producing fine grained images.
• Process according to claim 3 characterised in that as a fine grain developer at phenylene-diamine taken from the class consisting of the ortho and para compounds is used.
• Process for the preparation of photographic and cinematographic pictures which comprises providing a film having highly light sensitive exposure material thereon, exposing the same to an image on a luminous fluorescent screen, and subjecting the fllm to an intensive alkaline developing operation, such developers being used which contain alkali carbonate and an. organic nitrogen compound capable of increasing gradation.
• a developer for the preparation of photographs obtained by exposure of a film to a luminous fluorescent screen comprising a material of high sensitivity and having a high proportion of caustic alkali, the solution being substantially saturated with the developer.
• a developer for the preparation of photographs obtained by exposure of a film to a luminous fluorescent screen comprising a material of solution containing hydroquinone to a p int of I substantial saturation, a substance taken from the class of amines and amine salts, a relatively high concentration of a soluble sulphite and of caustic alkali.
• Process for the preparation of photographic 'and cinematigraphic .pictures which comprises preparing "a film which has a highly sensitive emulsion, exposing the same without overexposixig, placing the same in an intensive developing solution containing hydroquinone to a point of substantial saturation, a substance taken from the class of amines and amine salts, a relatively high concentration of a soluble sulphite and of caustic alkali, said solution containing also a substance capable of increasing gradation taken from the class of nitroand chloro-be'nzimidazole and chloro-benzotriazole.
• a film which has a highly sensitive emulsion exposing the same without overexposing, placing the same in an intensive developing solution containing hydroquinone to a. point of substantial saturation,. a substance taken from the class' of amines and amine salts, a relatively high concentration of a soluble sulphite and of caustic alkali, said solution containing also a substance capable of increasing gradation taken from the class of nitroand chloro-benzimidazole and chloro-benzotriazole,- and-then treating the film vin a reversal bath to dissolve out fogging, said bath containing phenylenediamine.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Silver Salt Photography Or Processing Solution Therefor (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=7991271

Family Applications (1)

Country Status (3)

Cited By (3)

• 0
  • BE BE429070D patent/BE429070A/xx unknown
• 1938
  • 1938-07-09 US US218390A patent/US2228762A/en not_active Expired - Lifetime
  • 1938-07-11 FR FR842428D patent/FR842428A/fr not_active Expired

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