US2235033A - Combined sound and color picture film - Google Patents

Description

March 18, 1,941., A MILLER 2,235,033

COMBINED SOUND AND COLOR PICTURE FILM vFiled Nov. 5, 1957 E; m m si/velfia/l'de emulsion Myers supper/i coflfmh/hg 03195121,? componenh silver halide emu/s/bn layer wi/ho ul ca/or farmer's A Zf'recei Mzdder Inn/BMW latented Mar. 18, 1941 PATENT OFFICE COMBINED SOUND AND COLOR PICTURE FILM Alfred Miller, Dessau, Germany, assignor, by mesne assignments, to General Aniline a Film Corporation, New York, N. Y., a corporation of Delaware Application November 5, 1937, Serial No. 172,866

Germany November 9, 1936 1 Claim.

My present invention relates to sound and color picture films, and the method of their production.

Combined sound and color picture films are already known in which the picture records are present as dyestufi images and the sound record as a silver image. In the production of such films it is necessary to protect the sound track from the action of the treatment baths during the conversion of the picture record into colored images. This frequently increases the number of operations and complicates the treatment of the m. It is an object of my invention to simplify the production of combined sound and picture films.

A further object is the provision of a new and improved photographic material,

Further objects will be apparent from the detailed specification following hereafter.

In the drawing the single figure represents diagrammatically a cross section of a cinematographic film in an enlarged scale. The drawing is otherwise self-explanatory and shows the arand on the other side of the support a silver halide emulsion layer containing no dyestufi component. The layer or layers containing dyestuiI components serve 'for the production of the colored pictures whilst the sound record is produced in the silver halide emulsion layer containing no dyestufi component. For producing the picture and sound records the film may be exposed from one side or from both sides and the exposures for producing the picture record and the sound record may occur simultaneously or in succession.

As dyestufi components for the light-sensitive layers serving tor the production of the picture record there are particularly suitable the dyestufi components fast to difiusion described in U. S. Patent applications Ser. No. 72,718 filed April 4, 1936, now Patent No. 2,179,238, of November 7, 1939, Ser. No. 90,726 filed July 15, 1936, now Patent No. 2,178,612, of November 7, 1939, Ser. No. 94,340 filed August 5, 1936, now Patent No. 2,186,849, of January 9, 1940, Ser. No. 158,860 filed August 13, 1937, now Patent No. 2,179,244, of November 7, 1939, Ser. No. 159,518 filed August 17, 1937, now Patent No. 2,186,732, of January 9, 1940, Ser. No. 164,499 filed September 18, 1937, now Patent No. 2,186,733, of January 9, 1940. These layers may furthermore be sensitized for different spectral regions by means of sensitizing dyestufis. They may also contain any of the additional substances used in the preparation of photographic emulsions, for example stabilisers. The single layer on the other side of the support serving for the production of the sound record may be an ordinary silver halide emulsion layer such as is customarily used in sound films. The photographic material used in accordance with the invention may also contain filter layers or an antihalation layer. It required filter dyestufis may be incorporated in one or more of the emulsion layers.

The treatment of the photographic material after exposure is relatively simple since the lightsensitive layers serving for the picture record contain dyestuii components which can be converted into dyestufi images by color development. The pictures may be produced either by a single development or by reversal development, which may be conducted for example according to the processes of the U. S. Patent applications Ser. No. 100,319 filed September 11, 1936, now Patent No. 2,179,234, of November 7, 1939, and Ser. No. 148,731 filed June 17, 1937. It is merely necessary it the pictures and sound are recorded simultaneously, to take care that the baths serving for removal of the silver from the picture layers do not act on the developed sound track; for this purpose for example the baths may be allowed to act only on one side of the film, for example by treating the film by the so-called floating process or by the use of a resist.

If the sound track is only subsequently exposed no particular precautions are necessary during the development of the picture layers since the development and treatment baths for the picture layers donot act on the layer which is to receive the sound record. The separate development of the picture and sound records offers the advantage that the sound record can be de veloped with a special developer.

If the film is to be subjected to reversal development the exposure of the sound track may precede the second development so that the picture layers and the sound track are developed together during the second development.

The pictures and sound may be recorded on the photographic material in accordance with the invention either by direct exposure or by printing.

What I claim is:

A method of processing combined sound and picture films which comprises exposing to light a cinematographic picture film having on one side a plurality of diflerently light-sensitive silver halide emulsion layers each containing a dyestufi component fast to difiusion and capable of being developed by the same color iorming developer to give dyestuffs of difl'erent colors, said film having on the opposite side a silver halide emulsion free from dyestuff components and designm to receive only a sound track. developing the film to black and white, re=exposing the emulsion layers containing the dyestuff components, recording a sound track in said last named emulsion layer and simultaneously developing all of the layers in the same solutions by a developer, the oxidation product of which reacts with said dyestufir components to form said dye stuffs.

ALFRED

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