DE1295998B - Use of a photographic material for the development of light, in particular for oscillographic recordings - Google Patents

Description

1 2

They are photosensitive to radiation. _: , are water-soluble salts and salts that are in with

Materials with a silver halide emulsion ^ "water-miscible solvents, such as

layer known in which upon exposure to a methanol, ethanol and the like, are soluble, is preferred

High intensity light source used to create a latent image.

which then by exposure to light 5 preferably contains the silver hagonide emulsion,

lower intensity to a visible image based on the halogen silver, 1 to 20 mole percent

can be wrapped. Such radiation-sensitive stannous salt and 0.5 to 5 mole percent cupric salt.

Liehe photographic materials find in particular Suitable water-soluble halides are, for example

in so-called light pens or oscilloscopes show the chlorides, bromides and iodides of the

Use. The silver halide emulsion layers of ammonium, calcium, lithium, magnesium,

such photographic materials contain potassium and sodium. Preferably contains the

either a so-called halogen acceptor, e.g. B. Silver halide emulsion as a water-soluble halide

Thiourea, or certain inorganic salts. a bromide. Advantageously, 1 to

For example, from the German interpretation, 10 mole percent water-soluble bromide, based on

writing 1123 557 light-developable, directly recordable 15 the silver halide, used,

nend photographic materials with a silver- To prepare the silver halide emulsion are

halide emulsion layer known, which is used by one of the silver halide grains whose beam

Content of a lead salt and a stannous salt as well as sensitivity to lungs to a considerable extent,

excess halogen ions is marked. preferably for the most part, on one

It has now been found that there is a high internal grain sensitivity for light. The silver evolution photographic, in particular oscilloscope halide, can, for example, consist of silver bromide, graphical recordings consist of silver bromide iodide and silver chloride bromide in an excellent manner, photographic materials with a silver and silver bromide as a predominant proportion always Let use halide emulsion layer which prevails. The silver halide grains of the emulsion Correct amounts of a stannous salt, a cupri-25 are expediently of an average size salt and a water-soluble halide. from 0.1 to 10 microns. Preferably a

The invention thus relates to the use of silver halide emulsion with grains of a

formation of a photographic material, consisting of an average diameter of 0.5 to 1 micron

turns from a carrier with a layered on top.

Silver halide emulsion, the silver halide of which consists predominantly of silver bromide and which, based on photographic material, has 0.5 to 120 mol percent of an emulsion of high internal grain sensitivity of an emulsion of high internal grain sensitivity and 0.1 to 25 mol percent of a cupric salt the following properties: If a sample of 0.1 to 100 mole percent of a water-soluble emulsion is applied to a transparent support containing halides, for light development in particular for a certain time between 1 · 10 ~ ⁶ and special oscillographic recordings, where 1 second exposed to a light intensity scale, the first exposure is with a xenon flash lamp of high intensity for 5 minutes in a 0.3% potassium ferricyanide or a flash lamp with a light solution bleached at 18 ° C and for 5 minutes at a similar intensity and the light 18 ° C in the one described below n development with a light source of lower intensity winding B, then the emulsion has a sity. Sensitivity measured at a density of 0.1

The photographic used according to the invention above the veil, which is greater than the sensitivity

Material is characterized by a familiarity with a corresponding sample of the photographic

th photographic materials improved em- graphic materials made in the same way

delicacy. The exposed using a photo-45 and 6 minutes at 20 ° C in the im Graphic material according to the invention, the following developer A is developed

bare image has excellent contrast and was

excellent stability. Developer A

The fact that N-methyl-p-aminophenolsmfat containing stannous salts .... 0.31 g

Highly developable silver halide emulsions by 50. * .. _ '

The addition of cupris salts significantly improves sodium sulphite, dehydrated 39.6 g

was not to be expected, nor did hydroquinone 6.0 g

knowing the known facts that sodium carbonate dehydrates 18.7 g

by adding copper to celloidin emulsions, potassium bromide 0.86 g

Retain hard copying papers (see Hay, 55 Citric Acid 068 2

»Handbuch der Photographies, Vol. IV, pp. 301/302 Citric Acid u, ö» _g

[1939]) and that the addition of copper chloride produces potassium metabisulphite 1.5 g

for silver halide photographic emulsions made up to 1.01 with water

The density of the silver can be increased (cf. Eder, »Hand-DevelopersB

Buch der Photographic «, 5th edition, part 3, p. 135 60

[1902]). N-methyl-p-aminophenol sulfate 2.0 g

To produce the sodium sulfite used according to the invention, 90.0 g dehydrated

Cupric salts suitable for photographic material are hydroquinone. 8.0 g

z. B. Cupriacetate, Cupric Sulphate Cuprirdtrate and Cupric Sodium Carbonate, "Monohydrate ". '.'. '. 52 ^ 5 g

bromide. Suitable stannous salts are e.g. B. Stanno- 65. ^J

acetate, stannon nitrate and stannobromide. Appropriate potassium bromide 5, Ug

Cupric and stannous salts are used, the slightly sodium thiosulphate 10.0 g

can be incorporated into the emulsions. Therefore topped up with water to ... 1.01

A large number of hydrophilic, water-permeable, organic colloids can be used, e.g. B. colloidal albumin, cellulose derivatives and synthetic resins. Gelatin is preferably used.

It has proven advantageous if the silver halide emulsion contains a cyanine dye.

The formation of the latent image in the photographic material according to the invention takes place with a high intensity light source, generally those rich in blue and ultraviolet Light is as it is used, for example, in oscilloscopes. The subsequent light development takes place by irradiation with a light source opposite the light source used initially lower intensity, e.g. B. an ordinary fluorescent lamp or a tungsten lamp or even with ordinary daylight. In general, that which is initially formed in the emulsion is latent Image not visible, d. That is, it only becomes visible through the development of light. If necessary, can the photographic materials are fixed after the light development.

The following examples are intended to illustrate the invention in more detail.

example 1

First, a photosensitive gelatin silver chlorobromide solution (containing 95% bromide and 5% chloride) with high internal grain sensitivity of the type described in U.S. Patent 2,592,250 was prepared. First 50 mole percent potassium bromide, 5 minutes later 20 mole percent stannous chloride dissolved in methanol, and then 1.5 mole percent cupric sulfate dissolved in water, each based on the silver halide, were added to part of the molten emulsion. The emulsion was heated to 60 ° C. for 10 minutes and then applied to a paper support in such a way that 110 mg of silver and 255 mg of gelatin were ^{applied to a support area of 0.09 m 2.} The photographic material was then placed in a sensiometer, e.g. B. in Journal of the Society of Motion Picture and Television Engineers, 66 (1957),

P. 474, with a high intensity xenon flash lamp for 100 microseconds through a 21-step gray wedge exposed with 0.15 log E density steps. The material was then exposed to a 646 lux exposure for 5 minutes.

ao radiant fluorescent lamp developed light. During the development of light there were 16 0.15 log E levels visible. The steps were an intense blue on a greyish blue background.

Example 2

It became another photosensitive gelatin-silver chlorobromide emulsion of the type described in Example 1. Various proportions of the emulsion were as shown in Table I below specified additives, as described in Example 1, incorporated.

Table I. emulsion
No. Emulsion additives no 1 1.5 mole percent cupric sulfate 2 20 mole percent stannous chloride 3 50 mole percent potassium bromide 4th 20 mole percent stannous chloride
1.5 mole percent cupric sulfate 5 50 mole percent potassium bromide
1.5 mole percent cupric sulfate 6th 50 mole percent potassium bromide
20 mole percent stannous chloride 7th 50 mole percent potassium bromide
20 mole percent stannous chloride
1.5 mole percent cupric sulfate 8th

The concentrations given relate to Example 1 described, applied to a layer substrate,

on the silver halide present in the emulsion. 65 exposed and light-developed in accordance with the image. In the

The emulsion no. 8 of Table I is a table following the invention Π are the number of visible

according to the emulsion used. 0.15-log Zs levels listed in each individual

Emulsions Nos. 1 to 8 were then obtained as in the case.

Tables

emulsion Visible 0.15 log B levels
after. Expose No. and light development 1 no picture 2 no picture 3 15th 4th no picture 5 16 6th no picture 7th 16 8th 18th

kelt. The number of visible 0.15 log Ε levels that are also given in Table TV below.

Table IV

Ip

. ■

Emulsion No. 8 used in the present invention accordingly showed an increase in sensitivity of two visible 0.15 log Ε levels compared to emulsion no. 7, which does not contain Cupris salt contained. ao

The densities in the picture tubes (D _max ) and in the background areas (D _min ) were also measured for each of the emulsions after exposure and light development. The densities were determined in a safety light using a No. 15 Wratten filter in a densitometer.

Tables!

Sealing after exposure and ^D max ^D min AD emulsion
TVT Light development 0.03 0.05 -0.02 No. 1 0.12 0.13 -0.01 (Control) 0.65 0.30 0.35 2 0.03 0.03 0 3 0.61 0.20 0.41 4th 0.03 0.03 0 5 0.60 0.25 0.35 6th 0.58 0.19 0.39 7th 8th

30th

Emul
sion
No. Emulsion additives Visible
0.15 log
B stages
according to picture
fairer
exposure
for light
development 9
10
11
12th
13th control
50 mole percent potassium bromide
20 mole percent stannous chloride
1.5 mole percent lead (II) nitrate
50 mole percent potassium bromide
20 mole percent stannous chloride
1.5 mole percent cupric sulfate
50 mole percent potassium bromide
20 mole percent stannous chloride
1.5 mole percent lead QGQ nitrate
+ Cyanine dye
50 mole percent potassium bromide
20 mole percent stannous chloride
1.5 mole percent cupric sulfate
+ Cyanine dye no picture
13th
17th
13th
18th

35

40

As can be seen from Table ΠΙ, an excellent contrast (AD) can also be achieved when using emulsion No. 8.

Example 3 "-

(Comparative example)

The additives indicated in Table IV below were added to various proportions of a light-windable gelatin silver chlorobromide emulsion of the type described in Example 1. The addition of cupric sulfate, stannous chloride and potassium bromide on the one hand was compared with the addition of lead (n) nitrate, stannous chloride and potassium bromide on the other. The effect of a cyanine dye customary for panchromatic sensitization of silver halide _{emulsions, namely 3 3} 3'-diethyl-9-methylthiacarbocyanine bromide _{3, was also} tested.

The indicated concentrations of the additives relate to the silver halide present in the emulsion. Emulsions Nos. 11 and 13 are emulsions used in the present invention. The emulsions nos. 9 to 13 were each, as described in Example 1, applied to the support, exposed in an imagewise manner and light-developed _; The results obtained show increases in sensitivity of four and five visible 0.15 log i? Levels, respectively, for emulsions no. 11 and 13 used according to the invention, compared with the known emulsions of the prior art no. 10 and 12, respectively.

Claims (5)

Patent claims: 1. Use of a photographic material consisting of a support with one thereon layered silver halide emulsion, the silver halide of which is mainly composed of silver bromide and which, based on the silver halide, 0.5 to 120 IV tol percent of a stannous salt, 0.1 to 35 mol percent of a cupric salt and 0.1 to 100 mol percent of a water soluble one Contains halides, for the development of light, especially in oscillographic recordings, wherein the first exposure is with a high intensity xenon flash lamp or a flash lamp a light of a similar intensity takes place and the light development with a light source of lower intensity follows. 2. Use of a photographic material according to claim 1, characterized in that that the silver halide emulsion, based on the silver halide, is 1 to 20 mole percent stannous salt and contains 0.5 to 5 mole percent cupric salt. 3. Use of a photographic material according to Claims 1 and 2, characterized in that that the silver halide emulsion contains a bromide as the water-soluble halide. 4. Use of a photographic material according to Claims 1 to 3, characterized in that the silver halide emulsion contains a cyanine dye. 5. Use of a photographic material according to Claims 1 to 4, characterized in that that the silver halide emulsion silver halide grains having an average 0.5 to 1 micron in diameter.