DE2436102A1 - PHOTOGRAPHIC FILM UNIT AND METHOD OF MANUFACTURING IT - Google Patents

Description

PATENT LAWYERS

DIPL.-ING. R. SPLANEMANN DIPL.-CHEM. DR. B. REITZNER - DIPL.-INS. J. RICHTER MUNICH HAMBURQ

Polaroid Corporation eooo munchen: July 26, 1974

Valley 13

54-9 Technology Square Telephone (οβ9) 226207/226209

Telegrams: Inventius Munich

Cambridge, Massachusetts

(V.St.A.)

Act "= 3920 - I - 8749

Your sign:

Patent registration

Photographic film unit and method for making it

The invention "relates to a photographic film unit for additive color photography and a process for its production.

In additive color photography, a photosensitive silver halide layer is passed through an optical screen element or a grid with filter or sieve elements, the certain parts of the electromagnetic falling on the grid Selectively let radiation through, exposed «During the development of the silver halide layer exposed in this way silver is deposited as a function of the degree of exposure behind the respective segments of the filter elements, whereby the intensity of the light emitted when the image thus recorded is projected through the respective Filter elements passes through, is modulated.

409 8 86 / UI 7

Accounts: Deutsche Bank AG, Munich, account no. 20/14009 ■ Postal check: Mönchen 60060-807

In the case of additive pargraster units, the photosensitive material and the color grid can represent separate elements which are brought into register in a suitable manner during exposure and during viewing or projection of the image. Following the exposure of the photosensitive material of the grid can be removed to enable the development and production of the silver image, whereupon it can be reunited with the produced silver image for viewing of the final image, however, ₀ Preferably, the additive color raster permanently connected to the light-sensitive material in connection. With such an arrangement it is of course necessary to isolate the grid, for example by separating elements or intermediate layers, in order to protect it from being damaged or changed by the developer acting on the photosensitive material.

In general, suitable film assemblies will include one

Silver pan chromatically sensitized / halide layer and one additive multicolor raster. Examples of such arrangements are the Dufay color film and the color films in "The History of Color Photography" by Friedman (1944), Focal Press. Various conventional photosensitive layers can be used for additive films can be used, which depends on the particular development process to be used. For example, can ever a direct negative image and a direct positive image after the light-sensitive layer selected by the reversal process or a direct image using a conventional direct positive emulsion obtained; also carry out the transmission process

409886/1417

Silver diffusion or the formation of a separate positive image in a separate layer, which is then combined with the Exposure of the film unit used grid or brought with a practically identical grid to cover is, can be applied »

In a preferred film unit, an image receiving component is used between the photosensitive silver halide layer and the additive multicolor raster. With such a film unit, the silver halide emulsion is exposed through the grid and the image receiving component. During the subsequent development, a positive silver image in the image receiving component immediately adjacent to the additive multicolor screen is formed. Such a film unit is an example of an arrangement in which the problem of the grid for To bring coverage, does not occur, since the grid used in the exposure is automatic when viewed is brought to coincide with the positive silver image. In this film unit, the silver halide layer can after the generation of the positive silver image may or may not be removed.

Some examples of suitable films with superimposed negative and positive images made after diffusion transfer reversal processes U.S. Patents 2,861,885, 2,726,154, 2,944,894, 3 536 488, 3 615 427, 3 615 428, 3 615 429 and 3 615 described »

The usefulness of these film units in which the silver halide layer after the formation of the positive image remains an integral part of the film unit is due to the fact that a layer is used as the image receiving element

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is used in which the silver is precipitated or precipitated very efficiently so that the precipitated silver has an exceptionally high hiding power compared to the negative silver developed in the silver halide layer. These phenomena are described in detail in the work of Edwin H. Land, One Step Photography, Photographic Journal , Section A, pages 7-15, January 1950 "

The integral pilm units indicated above, in particular those described in the US patents mentioned are particularly suitable as motion picture films for Projection of moving images, for example for the motion picture system described in US Pat. No. 5,615,127 The development of these pilm units and the composition of the developers are detailed in the described above patents.

However, additive color photography has not yet become very common. There are a number of reasons for this; in particular visual and sensitometric examinations of additive pilm units show a not yet entirely satisfactory one Color saturation, especially in heavily exposed areas. Furthermore, a color desaturation is observed, i.e. the appearance of pale colors or negative colors.

The invention has set itself the task of eliminating these disadvantages and an improved additive To provide multi-color film for projection purposes. Such a PiIm contains in the specified Sequence an additive multicolor screen, a light-sensitive silver halide layer and an antihalation layer in the immediate vicinity

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to the side of the silver halide layer opposite the multicolor additive screen. By using the Antihalation layer becomes a reflection or backscattering of what has passed through the silver halide layer prevents actinic radiation back into the silver halide layer, whereby a pronounced color separation, is obtained particularly in the regions of the color density curve (characteristic curve).

The invention is explained with reference to the drawing. Show it:

1 shows an enlarged section through a preferred embodiment of a film unit according to FIG Invention;

FIG. 2 is an enlarged section through another preferred embodiment of a film unit according to FIG the invention;

3 shows a graphic representation of color density curves (characteristic curve) of a red bar (red column) a control film unit; and

FIG. 4 is a graph showing color density curves of a red bar of a film unit according to FIG Invention.

According to the invention it was found that when using an antihalation layer in the immediate vicinity the side of the light-sensitive silver halide layer opposite the screen, a reflection or backscattering of the light which has passed through the photosensitive layer is practically switched off as a result the absorption of the transmitted light is prevented from being absorbed by silver halide grains other than those which lie in the normal beam path of the incident light,

409886 / U17

ie silver halide grains lying directly behind that part of the filter element which allowed the original rays of the incident light to pass through, exposed. will _o

In the present invention, the antihalation layer can be used in any of the above-mentioned color additive film units After these film units in addition to the photosensitive silver halide layer and the additive Color grids can contain further layers, a further condition is that the antihalation layer must be arranged in the immediate vicinity of the side of the silver halide layer, which is opposite the grid, no matter how the photosensitive layer or the other layers in the film unit are arranged. The additive color images obtained according to the invention clearly show one improved saturation and color fidelity .. As already mentioned, the well-known film units show desaturated colors, especially in heavily exposed areas that can even be perceived as "white" instead of colored. Farther became color distortions, i.e. false colors or so-called Negative colors, noted.

The above-mentioned disadvantages of the known film units are probably due to the fact that light transmitted through the silver halide emulsion layer at an angle to its original direction of incidence is reflected back into the silver halide layer. The reflected light turns silver halide grains exposed that are at a lateral distance from the axis of the original light beam, used to expose the silver halide emulsion layer. The exposed silver halide grains

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_ 7 -

can therefore be located behind a filter element of the additive color grid that has a different color than the element through which the light originally passed. As a result of such exposure, the aforementioned occurs Loss of color saturation and color fidelity. Used film units with very thin silver halide layers, especially silver halide layers less than about 2150 mg silver per 1m- (200 mg / sq.ft.) » so the loss of color saturation is particularly critical The less silver halide is available to absorb the light incident on the film unit, the more light passes through the silver halide layer through and is reflected back.

Under the term "antihalation protection" as used here is understood to be the prevention of the above phenomenon, i.e., the back reflection of light into the emulsion layer from the interface of the emulsion layer with the air or another layer.

According to the invention, all suitable light-absorbing Substances are used; preferred substances are dyes and pigments. According to a preferred embodiment, the backscattering is prevented by a layer of one or more antihalation dyes used on the side of the photosensitive silver halide layer opposite the screen. But since the film unit according to the invention mainly is a projection film, so will the antihalation layer made practically non-absorbent after exposure of the photosensitive layer and before viewing, in order to avoid undesired absorption of light during projection and to achieve good color reproduction to maintain. According to a preferred embodiment the antihalation dyes are in one for the

A09886 / U17

Developer-permeable layer is arranged, and the absorbency is eliminated, i.e., the layer is made practically non-absorbent, either by the action of the developer or by a separate treatment after exposure to the developer, or by the application of heat or light.

The antihalation layer can also be used after exposure, e.g. before, during or after development, can be removed by detaching them from the film unit. The separation can be carried out by peeling off or dissolving the layer or by washing the light-absorbing material out of the layer. The separation becomes special used when the light absorbing material is insoluble in the developer, i.e. when a pigment, e.g. Carbon black or a light absorbing metallic material including light absorbing crystalline metal salts is used. As I said, however, antihalation dyes are preferably used in one for the developer permeable layer used; these dyes have what is required when the film unit is exposed Light absorptivity, but will be in contact with the developer, which during development in the antihalation layer penetrates, removes.

From the above-described method is preferably used the one in which the film units are developed according to the invention by diffusion transfer reversal processes, wherein the film units uniform structure represent, ie in which the emulsion after exposure, and the generation of the positive image on the positive silver image, and the additive multicolor grid remains arranged. With one especially

409886 / U17

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Q -

preferred film unit is a separate image receiving layer for the positive silver image between the photosensitive Silver halide emulsion and the additive multicolor screen.

The additive multicolor screens preferably contain filter elements as fine as the photographic system needs to achieve the greatest possible resolution. A high resolution is particularly desirable in projection systems, since a low resolution limits the degree of magnification of the projected images. According to the invention it is possible. additive multicolor screens with around 1200 elements or lines per cm (3000 per inch) or, taking into account a three-color screen (trichromatic screen) with around 400 triplets per cm (1000 per inch). In such a three-color grid, a large number of geometrically recurring colored light filter elements are used, ie _o a series of primary, blue-colored filter elements, a series of primary, green-colored filter elements and a series of primary, red-colored filter elements, which in a repetitive distribution page are arranged side by side essentially in a single plane »

As the number of filter elements per unit length increases, the area of each element increases and the grid acts as a grating that absorbs the actinic radiation incident on a certain element increasingly bends. The diffracted light can pass through the filter elements located directly behind the respective filter element Silver halide crystals are not completely absorbed. As I said, this is especially true for Silver halide emulsions with a relatively low silver content are the case. The unabsorbed light

409886/1 Al 7

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which passes through the silver halide emulsion layer may be due to the difference in refractive index between the photosensitive layer and the adjacent layer from the back of the silver halide emulsion layer reflected or backscattered, resulting in exposure of silver halide crystals can lead behind adjacent filter elements of the color grid. By using the antihalation layer According to the invention, the production of additive color raster elements with a relatively low Silver concentration facilitates, so that excellent projection images with a high degree of saturation can be obtained becomeβ

Antihalation dyes suitable according to the invention are known per se.

Typical antihalation dyes according to the invention can be used are, for example, in U.S. Patents 3,471,293, 3,469,985, 3,440,051, 3,389,994, 3,384,487, 3,364,029, 3,352,680, 3,340,062, 3,005,701 and in British Patent 515,988. Oxonol and triarylmethane dyes are particularly useful in the present invention.

However, it was not heretofore known to use these dyes in a polymeric material permeable to the developer to be spread to produce an antihalation layer which initially has the above-mentioned light absorptivity has, but at the same time is permeable for the developer in order to enable the development of the image. Instead of the dyes either in the form of a solution or in the form of a dispersion in which the developer is permeable Layer to distribute one can use the dyes

A09886 / U17

can also be applied directly to the photosensitive layer without using a polymeric carrier. Here, however, is ensure that no light-absorbing material is introduced into the silver halide emulsion layer, which affects the photographic sensitivity of the emulsion. In another embodiment can the dyes are distributed in a layer after exposure and before the projection of the image from the Film unit can be peeled off.

Shall use the antihalation layer as part of the film assembly are retained, the dye should be bleachable after exposure, so that it is practically colorless, what is preferably achieved by exposure to the developer. The dyes must be in the film unit as well be relatively immobile.

Some examples of dyes suitable according to the invention are given below:

'C-CH = ± CH

ClO

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3.

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HSO.

(Color Index 42040)

4th

SO ₃ Na

n "(c ₂ h ₅ )

(Color Index 42095)

SO ₃ Na

(Color Index 42500)

6. Zinc double chloride

from

Cl "

+ N

(Color Index 42585)

409886/1417

7. ¹ P ₂ H ₅

il

C-

? 2 ^H 5

-N,

S = CN = CH- (CH = CH) ₂ -

'N C

C ₂ H ₅ C = S

C N '

A-

^C 2 ^H 5

+ N-H

8th.

? 2 ^H 5? 2 ^H 5

S = C

C N.

-CH = CH-C C = S

C ₂ H ₅

^v co "

-N C ₂ H ₅

7 ^Νλ

' + NH

9.

S = C

<ρ ^Η 5 .Ν—

.N-

^C 2 ^H 5 ? 2 ^H 5

-N

C = S

C-0 "

-N ' ^C 2 ^H 5

+ N-H

CH ₂ CH ₂ Cl

10.

CH =

Cl-CH ₂ -CH ₂ ■ CH-

11.

(CH ₃ ) ₂ -N- <' ^y ) CH = N

409886 / U17

• U ·

12. (CH ₃ ) ₂ -N- ^ _ Τ "CH = I H-CH ₃

COOH

CH

Cl

COOH

(CH ₃ ) ₂ -Ν-Λ Λ-CH

CH-

COOH

CH ₃ -CH ₂

: H— (CH = CH) ₂ -HO ''

SO,

SO,

IL

"C-OCH ₂ -CH ₃

Η — Ν— (CH ₂ ) ₄ —CH ₃ Η — Ν— (CH ₃ ) 4-

409886 / U17

£ in / 988607

■ ² (HD = HD) - ² HD = J '- ¹ - DO- ^c (° HD)

Il Il

ο ο

OH

^{£ 2} HD HD-0-D- ^ ¹ ^ - ⁽² HD = HD) - ² H;

JDO- ^{2 HD- £} UD * 8T

. ^e HD— ² HD — O — D -J-

"

HD = HD

iff

- ² HD = IL _D _ ₀ -2 _HD -

-HD 'Ll

^£ HD— ² HD — 0 — I

) —0— ° HD-

20. CH ₃ -

H ₂ - (CH = CH) ₂ -

"CO-CH ₂ -CH ₃

HO

(CH ₂ )

(CH ₀ )

21. S = M, 7 = CH-CH = CH

CH,

CH,

SO ₂ NH ₂

SO ₂ NH ₂

(CH ₂ ) ₅ CH ₃

(CH ₂ ) ₅ CH ₃

= CH-CH = CH

/ = ^s

CH

|
CH

SO ₉ NH ₀

409886 / H17

CH ₃ CH ₂ OOC-J - CH-4CH = CH)

^ Ο

TT

HO- ^ N ^

_{24.CH 3} (CH ^) ₂ OOCη _CH-4CH = CH) - ^ ρ COO (CH ₂ )

25. CH ^ (CH ₀ ) , 00C-, p-rCH-4CH = CH) -τ, - COO (CH ₀ ), CH-

J ^ JU ι 2 Ii ι! £ j

ΤΛ

26. CH ₃ (CH _{2) 4} 00C

COO (CH ₃ )

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27. CH ₃ CH ₂ OOC

₃ w.i2t ~ v.- | -.CH- (CH = CH) -Jj ρ COOCH ₂ CH ₃

HCT ^ N

CH ₃ CH ₂ OOC-Jj f_CH- (CH = CH) ₇₇ J j- COOCH ₂ CH ₃

_Na0

CH ₃ O

O ^ N ^

CONH-nC ₄ H _g

H Cl

30. (CH ₃ J ₂ N

CONH-II-C ₄ H ₉

SO ₂ NH ₂

A09886 / U17

H Cl

CH

O ^ N

CH = CH-CH-CH

CH CONH-Ii-C ₄ H ₉

SO ₂ NH ₂

H Cl

-JpCONH-C ₂ H ₅

(CH ₃ ) ₂ N- / V> ~ CH = CH-CH

OH

9886/1417

35.

- 20 -

CH = CH-CH O

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CH-

OOH

³⁷ '

ⁿ ~ ^C 3 ^H 7

! 00H

o-anisyl

: ooh 409886/1417

UU / 988607

HOOD

HOOD

HdJL

'HD

"HD

"Ofr

HOOD

e _HD J! t ^ H

HD

243610

The dyes indicated above can also be used as Salts, e.g. as silver salts.

The level of light absorption of the antihalation layer can vary over a relatively wide range depending on the desired efficiency of absorption and the amount of absorption required for a particular silver halide emulsion layer. Preferably, the antihalation layer has a transmission density in the range of about 0.4 to 1, 4, preferably more than 0.6. Thus, when exposing a plurality of film units in the form of a shock or the film pack, so the antihalation layer should preferably contain a sufficient density (light absorbance) have a reflection and an exposure of the film units underlying to prevent virtually ₀

It has been found that the amount of the light absorber which is necessary to achieve the desired transmission density and absorption properties is relatively low is. For example, there have been satisfactory film units

ο
with about 108 mg of dye per m (10 mg / sq.ft.). Conversely, however, relatively high dye concentrations can also be removed quickly and completely with the aid of the developer, which penetrates the antihalation layer.

The polymeric material used to contain the light absorbing material is not critical; however, the polymer used should preferably be permeable to the developer. Suitable polymers Substances are ethyl cellulose, cellulose acetate hydrogen phthalate, Polyvinyl alcohol, polyvinyl pyrrolidone and gelatin.

409886 / U17

1 shows an enlarged section through an integral film unit according to the invention; these contains a transparent film base 10, which has an additive on one side in the specified order Multicolor raster 11 with a variety of primary red Color filter elements, a variety of primary green color filter elements, and a variety of blue color filter elements in a geometrically repeating distribution side by side and practically in a single one Level; an essentially light-insensitive layer with seeds for precipitation of silver; a light sensitive Layer 12 with silver halide crystals and a layer 14 with one or more antihalation dyes wearing.

Figo 2 shows a further embodiment of the invention, in which the film unit contains a clear base 10, which is on one side in the order given an additive multicolor raster 11, a practically light-insensitive layer 13 with germs, for precipitation of silver, a photosensitive layer with silver halide crystals, a peeling layer 15 and a das Light absorbing layer with soot bears.

In the case of the film unit according to FIG. 2, the layers 15 and 16 after exposure of the photosensitive layer 12 separated from the film unit. In this embodiment, therefore, it is not necessary that the light absorbent is removed or made transparent with the help of the developer, since the layer 16 in which the Absorbent is contained during the projection no longer with the film unit, which is the positive silver image carries, communicates. The release liner 15

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may contain the usual materials known in photography, and their adhesion is preferably controlled by exposure of the developer, so that the layers 15 and 16 easily by a suitable chemical or mechanical effects can be removed

Optionally, the film unit can contain additional layers, e.g. separate layers with developer reagents, Barrier layers, protective layers, backing layers, etc.

If a dye has a desensitizing effect on the silver halide emulsion, appropriate precautions can be taken be taken to prevent contact, for example by using suitable Insulating layers.

The silver precipitating germs can be in the light-sensitive Silver halide layer of the film unit, in a separate layer or in separate layers, which are in contact with one or both sides of the silver halide layer, and it Two or more silver halide layers can be used, each of which may contain nuclei Deposition of the silver may contain it may also a separate layer of seeds for depositing silver between separate silver halide layers be provided.

The types and amounts of the silver-precipitating nuclei which are suitable according to the invention are in the above U.S. Patents 3,615,427, 3,615,428, 3,615,429, and 3,615 called.

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Silver halide emulsions suitable according to the invention are also mentioned in the patents given above. Particularly useful silver halide emulsions are the substituted halide silver halide emulsions as described in co-filed patent application P 3 ^?> (P 1J? O> (b (US application 383 177; our reference: 3920-1-8805) The color grid can be produced in a manner known per se Preferred methods for producing the grid are given in US Patents 3,032,008, 3,229,607 'and 3,318,220.

The backing or film support can be any transparent rigid or flexible material, for example Glass, polymer films made from synthetic material or from natural product derivatives. Particularly suitable Materials are flexible, transparent synthetic polymers such as the methyl and ethyl esters of polymethacrylic acid, Vinyl chloride polymers, polyvinyl acetate, polyamides such as nylon, polyesters such as the polymeric films from ethylene glycol and terephthalic acid, polymeric cellulose derivatives such as cellulose acetate, nitrate, triacetate, propionate, butyrate, acid butyrate or acetate propionate, polycarbonates, polystyrenes, etc.

The invention is illustrated in a non-restrictive manner by the example below.

example

A film unit was made according to the procedures described above, with one side of one

en

Base made of a polyester film, an additive color raster at about 1200 lines per cm (3000 / inch). The raster contained a number of primary red filter elements, a number of primary blue filter elements +) and in US application 383 176

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and a number of primary green filter elements in a repeating lateral arrangement. The film unit also contained a protective layer made of cellulose acetate butyrate; a mass of deacetylated chitin and copper (II) sulfide, ie about 48 mg / m (4.4 mg / sq.ft.) deacetylated chitin and about 2.7 mg / m (0.25 mg / sq.ft.) .) Copper (H) sulfide j a panchromatically sensitized, hardened grelatin silver iodochlorobromide emulsion in an amount of about 1600 mg / m (150 mg / sq.ft.) Gelatin and about 1080 mg / m ² (100 mg / sq.ft.) silver and about 80 mg / m ² (7.4 mg / sq.ft.) propylene glycol alginate and about 31 mg / m (2.9 mg / sq.ft.) sodium dioctyl sulfo succinate; and a layer comprising about 0.85 grams of dye # 7, about 0.050 grams of dye # 8, about 0.150 grams of dye # 11 dissolved in about 4.5 grams of a 10 # solution of cellulose acetate hydrogen phthalate and about 9 grams cm of acetone.

The film unit described above and a control sample that differ from this film unit only as a result difference that the antihalation layer was omitted were made in the same manner with a conventional one Step wedge exposed and then developed, the film units for about 60 seconds with a developer were brought into contact, which proportionally contained the following components: 111 cm 'of water, 0.36 g of triaminophenol, 6.0 g hydroxyethyloellulose, 6.2 g sodium hydroxide, 16 g sodium thiosulfate, 6.48 g sodium sulfide, 6-nitrobenzimidazole, 7 g of a surface-active agent (reaction product of nonylphenol and glycidol) and 5 g of tolylhydroquinone. During development, the dyes in the antihalation layer became virtually non-absorbent made.

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The Pig. 3 and 4 show the values obtained by analyzing the red bar of the film unit with an analytical Color densitometers were obtained. Comparison of the curves shows that the film unit with the antihalation layer (Fig. 4) a far better color separation and thus a greater purity or color saturation of the red hue shows as the control sample (Fig. 3). A comparison of the toes of the corresponding curves shows that the negative color found on the control film unit in the areas of greatest exposure the film unit according to the invention is practically eliminated is. Furthermore, in the film unit according to the invention, the saturation and the color purity become over one keep wider exposure area.

The silver bromide emulsion used in the invention is suitably a silver halide emulsion with a predominantly homogeneous grain size, such as (US Application 383 196; our reference: 3920-1-8807) in the simultaneously filed patent application P Zf ^ r ^ 36 03> _t o is described. Such silver halide emulsions have an average grain diameter in the range from 0.7 to 1.5 / U, with preferably at least 90% of the silver halide grains having a diameter within + 30 <? O of this average diameter. These silver halide emulsions are preferably coated in an amount corresponding to a silver concentration of about 970 to 1340 mg / m (90-125 mg / sq. Ft.) Of silver.

- patent claims -

409886 / U17

Claims (1)

Claims 1. A photographic film unit, characterized in that
it contains, in the order given, an additive multicolor screen, a layer with light-sensitive silver halide crystals and an antihalation layer. 2. Film unit according to claim 1, characterized in that the antihalation layer is permeable to the developer is. 3. Film unit according to claim 1, characterized in that the radiation absorption capacity of the antihalation layer can be canceled in situ. 4. Film unit according to claim 1, characterized in that the radiation absorption capacity of the antihalation layer can be canceled by separating the layer from the film unit. 5 · film unit according to claim 1, characterized in that the photosensitive silver halide layer is not more than about 2150 mg / m (200 mg / sq.ft.7 / enlfclt. 6. Film unit according to claim 1, characterized in that the antihalation layer has an optical transmission density greater than about 0.4. 7. Film unit according to claim 6, characterized in that the transmission optical density of the antihalation layer ranges from about 0.4 to 1.4. 409886 / H17 8. A film unit according to claim 6, characterized in that the antihalation layer has a density such that
it allows practically no light to pass through during exposure. 9. Film unit according to claim 1, characterized in that the antihalation layer has one or more dyes
contains. 10 · film unit according to claim 9, characterized in that the dye after contact with the photographic developer practically no longer absorbs the radiation in the visible part of the electromagnetic spectrum. 11 · film unit according to claim 1, characterized in that the photosensitive layer is a direct positive emulsion represents. 12. Film unit according to claim 1, characterized in that it is developable by the reverse process. 13o film unit according to claim 1, characterized in that it is developable by the silver diffusion transfer process. H. Film unit according to claim 13, characterized in that it comprises an additive multicolor raster in the order given; a layer of photosensitive silver halide in association with silver-depositing nuclei;
and an antihalation layer, the antihalation layer being removable after exposure of the film unit. 409886 / U17 15. The film unit of claim. 14, characterized in that that the grid is a three-color grid with red, blue and green optical filter elements. 16 «film unit according to claim H in the form of a permanent fixed laminate, characterized by a translucent base that has a carries additive color raster; a photosensitive layer, which contains photosensitive silver halide crystals and, in connection therewith, egg precipitating nuclei; and an antihalation layer containing one or more dyes in an effective concentration to prevent the with respect to the photosensitive silver halide crystals to absorb actinic radiation and to reduce the reflection that which has passed through the light-sensitive layer and onto the interface opposite the grid To prevent radiation fallen from this layer, with the antihalation layer immediately adjacent to the the side of the emulsion layer opposite the grid is arranged, the silver precipitating nuclei be in an effective concentration to allow development in the presence of a solvent for the Silver halide as a function of exposure to provide a silver image that is based on the development of the exposed Silver halide crystals and whose maximum image density is much lower than the maximum Image density of the silver image resulting from the development of unexposed silver halide crystals, and the dye practically no longer emitting radiation after contact with a developer for the film unit absorbed 409886/1417 . 31 - 24361012 17 · Film unit according to claim 16, characterized in that that the silver precipitating nuclei in a separate layer in contact with the photosensitive Layer are arranged 18. Film unit according to claim 17, characterized in that that the light-sensitive silver halide crystals panchromatically sensitized silver chlorobromide, crystals of iodine chloride, iodobromide and / or iodochlorobromide represent. 19. Film unit according to claim 16, characterized in that that the germs precipitating the silver represent metal sulfides, metal selenides and / or colloidal noble metals. 20. Photographic process, characterized in that one (a) a film unit that, in the order given, an additive multicolor screen, one layer with light-sensitive silver halide crystals and an antihalation layer, exposed; (b) contacting the exposed film unit with a photographic developer; and (c) the radiation absorption capacity of the antihalation layer cancels 21. The method according to claim 20, characterized in that the transmission density of the antihalation layer is greater than about 0.4 during exposure of the film unit. A09886 / U17 22 »Procedure according to. Claim 21, characterized in that that the transmission density of the antihalation layer ranges from about 0.4 to 1.0 during exposure of the film unit. 25. The method according to claim 20, characterized in that that the radiation absorptivity of the antihalation layer as a function of the touch the layer with the developer picks up. 24. The method according to claim 20, characterized in that that the radiation B absorbance of the antihalation layer by removing the layer from the The film unit removes the antihalation layer from the film unit after exposure will. 25. The method of claim 20, characterized in that the photosensitive silver halide ^{layer contains no more than about 2150 mg / m 2} (200 mg / sq.ft.) Of silver. 26. The method according to claim 20, characterized in that the antihalation layer has one or more dyes contains. 27. The method according to claim 26, characterized in that the dye after contact with the developer practically no longer absorbs the visible radiation. 28 · Method according to claim 20, characterized in that the silver halide film is a rect-positive silver halide emulsion represents. 409886 / U17 29. Procedure according to. Claim 20, characterized in that that in connection with the light-sensitive silver halide layer, silver-precipitating nuclei are provided are that the developer contains a developing agent and a solvent for the silver halide and that in connection with the nuclei precipitating the silver after the diffusion transfer process a positive one Silver image is generated. 30. The method according to claim 20, characterized in that one (a) a photographic pilm unit with an additive Multicolor raster, silver precipitating germs, a layer with light-sensitive silver halide and an antihalation layer with absorptive capacity for actinic radiation, which is a reflection of the radiation transmitted through the multicolor screen and the photosensitive silver halide layer largely prevented back into the silver halide layer, exposed to actinic radiation, with the antihalation layer on an opposite side of the screen Side of the silver halide layer is arranged; (b) contacts the exposed element with a developer comprising a solvent and a developing agent for the silver halide it contains in order to post the element with a visible silver image Determination of the unexposed areas of the silver halide layer as a puncture of the point-wise degree of exposure to provide; and (c) cancels the radiation absorptivity of the antihalation layer. 4098 86 / UI 7 -34- 243610; 31. The method according to claim 30, characterized in that an additive three-color raster is used for the color raster used with red, green and blue optical filter elements in a screen pattern. 32, method according to claim 30, characterized in, that panchromatically sensitized silver chlorobromide, Silver iodochloride, silver iodobromide and / or silver iodochlorobromide crystals used. 33c method according to claim 30, characterized in that that metal sulfides, metal selenides and / or colloidal noble metals are used as silver-precipitating germs. R / hi 409886 / U17