US2275710A

US2275710A - Combined sound and picture film

Info

Publication number: US2275710A
Application number: US365082A
Authority: US
Inventors: Lot S Wilder
Original assignee: Eastman Kodak Co
Current assignee: Eastman Kodak Co
Priority date: 1940-01-03
Filing date: 1940-11-09
Publication date: 1942-03-10
Anticipated expiration: 1959-03-10

Description

March 10, 1942. L. s. WlLDER 2,275,710

COMBIN ED SOUND AND PICTURE FILM Filed Nov. 9, 1940 NEG/4 T/l E EXPOSURE.

/4 BLUE SENSITIVE.

/3 lNFRA-RED Java/W5 YELLOh/DYED. GREEN SENSITIVE.

/i I I I \RED ssmsmvs.

I/YFRA RED EXPOSURE SOL/ND TRACK PR/N TED (GLUE LIGHT).

TON/N6 REVERSAL EXPOSURE AND 6020/? DEVELOPMENI L076. Z/V/LDER INVENTOR ,W

W BY UGYMMZMM ATTORNEYS culties.

Patented Mar. 10, 1942 2,275,710 I common SOUND AND PICTURE FILM :Lot S. Wilder, Rochester, N. Y., assignor to Eastman Kodak Company, Rochester; N. Y., a cor- 'poration of New Jersey Application November 9, 1940, Serial No. 365,082

In Great Britain January 3, 1940 11 Claims.

This invention relates to a method ofrecording sound in photographic materials and especially to the recording of sound in multi-layer materials for color photography.

The recording of sound and picture images on motion picture film containing a plurality of "differentially light sensitive layers which are processed to color has heretofore presented difli- The characteristics of contrast and density desirable for the sound track are seldom compatible for those required for optimum picture quality and this is particularly true where the multilayer material is processed by reversal.

- Consequently, it is desirable to form the positive sound track by printing. from a negative rather than a master positive and forming the positive development process. i

It has been proposed in color'processes of th picture images by the usual'selective reversal selective reversal type to use an interlayer between two of the emulsion layers containing a light absorbing material to restrict reversal exposure to a single layer. A fogged emulsion which has been converted to silver by development, and yellow Carey-Lea silver, have been the most satisfactory layers for this purpose. As described above, for reasons of quality obtained it is highly desirable to have negative sound tracks on reversal color films. One way of accomplishing this consists inconverting the nega I tive silver in the sound track area to gold. This toning process has been described in Mannes and Godowsky application Serial, No. 298,116, filed I October 5, 1939, whereby in a film in which both colored picture images and sound images occur the negative sound image may be gold toned and the picture images formed by the selective reversal color process. However, during this toning process the silver in the conventional interlayers in the sound track area is also converted to gold and since this produces unwanted density in the sound track area the resultant film is ,not of highest quality.

One object of the present invention is to provide a means of satisfying the requirements for an interlayer containing density in the picture area without undesirable silver in the sound area. Another object is to provide a process which avoids the use of a screening dye which is stable to the processing solutions used in the selective reversal color process andis easily removable in weakly oxidizing bleach baths. Such dyes are not common and they are applied to color processes with utmost difiiculty.

These objects are accomplished in the' present invention by providing a multilayer sound and picture film with a light-absorbing interlayer which is sensitized to a region of the spectrum other than that to which any of the other emulsions are sensitive and which may be fogged and developed to silver in the picture area, the sound record being printable to the desired density and quality in the sound track area. I v

More specifically, I sensitize the .interlayer to the infra-red regionor in a narrow band of the spectrum such as the yellow region, which the other differentially light sensitive layers of a film do not record. This narrow-band sensitization has been described in the prior application of L. M. Dearing, Serial No." 328,311, filed April 6, 1940. The interlayer contains a soluble light absorbing dye such as tartra'zine or fiuorescein which serves to screen underlying layers during exposure of the picture area and is removable in negative developing solutions.

'The sensitizationof the interlayer to a region such as the infra-red then enables me to obtain a silver interlayer during-first development in the picture area only by exposing this area with infra-red light before processing. The following description illustrates a method of'processing a film such as I described. The accompanying drawing shows sectional views of a multilayer film, the various figures representing various stages in the processing treatment.

The multi-layer film comprises a support l0 upon which are laid in order emulsion layers, H red sensitive, l2 green sensitive, l3 infraered sensitive, and I4 blue sensitive. After exposure of the material in a camera as shown in the first stage of' the drawingthe infra-red sensitive interlayer I3 is fogged with infra-red light in the picture area, as shown in the second stage of the drawing, the sound track is printed with blue light, stage 3, and the film subjected to negative development whereby negative silver images are formed in the sound area i5, and the picture areas, and the screening dye of the infra-red sensitive layer is removed, a dense layer'of metalrial and process described I have succeeded in producing a sound image of the required density and quality and have obviated the use of the conventional colloidal silver interlayer in the sound area of a film.

While I have described only one means of opcrating the process I may vary the procedure by the appropriate selection of photographic materials and processes. I may position the light absorbing inter-layer which is sensitive to radiations other than those to which the other emulsions are sensitive, between any of the sensitive layers of a multi-layer sound-color film. The inter-layermay be fogged before or after exposure of the picture area, on before orafter exposure of the sound area. The soundimage area may be printed and toned after the negative development of the picture areas. My invention, therefore, is to be understood as limited only by the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. The method of forming sound and natural color picture images in a film having a plurality of layers sensitive to different spectral regions and a light absorbing interlayer between two of the sensitive layers on a support which comprises exposing the picture area to form an ima therein and fogging only in the picture area the lightabsorbing interlayer sensitized to a region of the spectrum other than that to which any of the other emulsions are sensitive, printing the sound image in the sound area, developing the film and gold toning only the sound image and subjecting the film to a series of exposure and color development steps to produce silver and dye images in the layers, the color development being one in which a color forming compound couples with the oxidation product of the developer and in which the gold sound image is not affected and then removing the silver images formed in the various developmentsteps without affecting the gold or the dye images.

2. The method of forming sound and natural color picture images in a film having a plurality of layers sensitive -to different spectral regions and a light absorbing interlayer between two of the sensitive layers on a support which comprises exposing the picture area to form an image therein and fogging only in the picture area the lightabsorbing interlayer sensitized to a region of the spectrum other than that to which any of the other emulsions are sensitive, printing the sound image in the sound area, developing the film and gold toning only the sound image before subjecting the film to a series of exposure and color development steps to produce silver and dye images in the layers, the color development being one in which a color forming compound couples with the oxidation product of the developer and in which the gold sound image is not affected and then removing the silver images formed in the various development steps without affecting the gold or the dye images.

3. The method of forming sound and natural color picture images in a 'film having a plurality of layers sensitive to different spectral regions and a light absorbing interlayer between two of the sensitive layers on a support which comprises.

which a color-forming compound couples with the oxidation product of the developer and in which the gold sound image is not affected and then removing the silver images formed in the various developmentsteps without affecting the gold or the dye images.

4. The method of forming sound and natural color picture images in a film having a plurality of layers sensitive to different spectral regions and a light absorbing interlayer between two of the sensitive layers on a support which comprises exposing the picture area to'form an image therein and fogging only in the picture area the light.- absorbing interlayer sensitized to the infrared region of the spectrum, printing the sound image in the sound area, developing the film and gold toning only the sound image and subjecting the film to a series of exposure and color development steps to produce silver anddye images in the layers, the color development being one in which a color, forming compound couples with the oxidation product of the developer and in which the gold sound image is not affected, and then removing the silver images formed in the various development steps without/affecting the gold or the dye images.

5. The method of forming sound and natural color picture images in a film having a plurality of layers sensitive to different spectral regions and a light absorbing interlayer between two of the sensitive layers on a support which comprises exposing the picture area to form an image therein and fogging only in the picture area the lightabsorbing inter -yer sensitized to the infra-red region of the spectrum. printing the sound image in the sound area, developing-the film and gold toning only the sound image before subjecting the film to a series of exposure and color development steps' to produce silver and dye images in the layers, the color development being one in which a color forming compound couples with the oxidation product of the developer and in which the gold sound image is not afiected, and then removing the silver images formed in the various development steps without affecting the gold or the dye images.

6. The method of forming sound and natural color picture images in a film having a plurality of layers sensitive to different spectral regions and a light absorbing interlayer between two of the sensitive layers on a support which comprises exposing the picture area to form an image therein and fogging only in the picture area the lightabsorbing interlayer sensitized to the infra-red region of the spectrum, printing the sound image in the sound area, developing the film and gold toning only the sound image before subjecting the film to a seriesof exposure and color development steps to produce silver and dye images in the layers, the color development being one in which a color forming compound couples with the oxidation product of the developer and in which the gold sound image is not affected, and then removing the silver images formed in the various development steps without affecting the gold or the dye images.

7. A method of forming sound and natural color picture images in a film having a plurality of layers sensitive to different spectral regions and'a light absorbing interlayer between two of the sensitive layers on a support which comprises exposing the picture area to form an image therein and fogging only in the picture area of the light-absorbing interlayer sensitized to the infrared-region of the spectrum and containing a dye, printing the sound image in the sound area, developing the film and gold toning only the sound image and subjecting the film to a series of exposure and color development steps to produce silver and dye images in the layers, the color development being one in which a color forming compound couples with the oxidation product of the developer and in which the gold sound image is not affected, and then removing the silver images formed in the various development steps without affecting the gold or the dye images.

8. A method of forming sound and natural color picture images in a film having a plurality of layers sensitive to different spectral regions and a light absorbing interlayer between two of the sensitive layers on a support which comprises exposing the picture area to form an image therein and fogging only in the picture area of the light-absorbing interlayer sensitized to the infrared region of the spectrum and containing a dye, printing the sound image in the sound area, developing the film and gold toning only the sound image before subjecting the film to a series of exposure and color development steps to produce silver and dye images in the layers, the color development being one in which a color forming compound couples with the oxidation product of the developer and in which the gold sound image is not affected, and then removing the silver images formed in the various development steps without affecting the gold or the dye images.

9. A method of forming sound and natural color picture images in a film having a plurality of layers sensitive to different spectral regions and a light absorbing interlayer between two of the sensitive layers on a support which comprises exposing the picture area to form an image therein and fogging only in the picture area of the light-absorbing interlayer sensitized to the infrared region of the spectrum and containing a dye, printing the sound image in the sound area, developing the film and gold toning only the sound image after subjecting the film to a series of exposure and color development steps to produce silver and dye images in the layers, the color development being one in which a color forming compound couples with the oxidation product of the developer and in which the gold sound image is not affected, and then removing the silver images formed in the various development steps without affecting the gold or the dye images.

10. The method of forming sound and natural cplor picture images in a film having a plurality of layers sensitive to different spectral regions and a light absorbing interlayer between two of the sensitive layers on a support which comprises exposing the picture area to form an image therein and fogging only in the picture area before exposure of the picture area the light absorbing interlayer sensitized to a region of the spectrum other than that to which any of the other emulsions are sensitive, printing the sound image in the soundarea, developing the film and gold toning only the sound image and subjecting'the film to a series of exposure and color development steps to produce silver and dye images in the layers, the color development being one in which a color forming compound couples with the oxidation product of the developer and in which the gold sound image is not affected, and then removing the silver images formed in the various development steps without affecting the gold or the dye images.

11. The method for forming sound and natural color picture images in a film having a plurality of layers sensitive to difierent spectral regions and a light absorbing interlayer between two of the sensitive layers on a support which comprises exposing the picture area to form an image therein and fogging only in the picture area after exposure of the sound area the light absorbing interlayer sensitive to infra-red, printing the sound image in the sound area, developing the film and gold toning only the sound image, and subjecting the film to a series of exposure and color development steps to produce silver and dye images in the layers, the color development being one in which a color forming compound couples with the oxidation product of the developer and in which the gold sound image is not affected, and then removing the silver images formed in the various development steps without affecting the gold or the dye images.

, LOT S. WILDER.

CERTIFICATE OF CORRECTION. .4

Patent No. 2,27 ,710. March 10, 19h2,

- LOT s. WILDER.

It is hereby certified that error appears in the printed specification of the above numbered pstent requiring correction as follows; Page 2, sec- 0nd column, line 68, claim 6, for "before" read --after--; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

- Signed and sealed this 2nd day of June, A. D. 19h2.

Henry Van Arsdale,

(Seal) Acting Commissioner of Patents.