GB342755A - Improvements in or relating to a method of and apparatus for making combined sound record and cinematograph films - Google Patents

Abstract

342,755. Kinematograph films. CHIPMAN, A. Le R., 10, Bridge Street, New York, U.S.A.-(Assignees of Chipman, H. E.; 97, Suffolk Street, Springfield, Massachusetts, and Chipman, H. H. ; 10, Bridge Street, New York, both in U.S.A.) Nov. 4, 1929, No. 33540. Convention date, Nov. 5, 1928. [Class 98 (ii).] A kinematograph film comprises two film layers 1, 2, with magnetic material constituting a sound record track 3 embedded between them, and a coating of cementitious material 5, 6, on either or both the opposed faces of the film layers as shown in Fig. 3. The upper film layer 1 may carry the photographic emulsion. The sound track 3 may be in the form of a ribbon or of magnetic granules. If desired, the lower film 2 may be of narrower width than the upper film 1 so as to extend between the sprocket holes of the combined film. During manufacture of the combined film, the photo-transparent films 1, 2 may be fed from reels 11, 8 over guide rollers 9, 10, 13, 12 as shown in Fig. 4, and coated with cementitious material from containers 16, 14. The sound track may be fed between the two films from another reel when the track is in the form of a ribbon and from a vibrated container 29 when in the form of granules. The container 29 is suspended on a rod 32 and vibrated from an electrically-operated arm 34. A magnet 35 may be arranged under the container 29 in order to obtain a uniform flow of magnetic material on to the film. The films are fed forwardly by means of sprocket-wheels 21, 25 and pressure rollers 22, 26, and between pairs of rollers 19, 20, 23, 24. The combined film is wound on to a drying-drum which is given both a rotary and translatory motion so as to prevent overlapping of the film. If desired, a number of sound tracks may be mounted between a pair of wide films, and the finished structure is cut so as to provide a number of combined films of the required widths. Each film may be provided with a single sound track of granular form, or with two ribbon tracks disposed at opposite sides of the film.