Business Screen Magazine (1963-1964)

were able to completely miniaturize all polarizing components producing animation, utilizing the fine accuracy of direct photographic images. Key to this system was a specially prepared light polarizing film which is sensitized with a photosensitive resist before use. Spcciul 3.5inni Polaroid Film The film basically is a specially prepared 35mni Polaroid film stock composed of a central support and a special layer on each of its outside surfaces. Each of these layers has been treated with a dichroic dye to render it differentially light polarizing because each outer layer has its polarizing axis oriented at right angles to the other. Thus, as above described, no light can pass through the film stock and it appears opaque. The angles of axial orientation of these polarizing layers correspond to those employed in making our large animations. One length of film stock is prepared having layers oriented, for example, at 0 and 90 degrees. A second film strip is prepared having its axial orientation at 45 and 135 degrees. Coat Each La\er \\'ilh Resist Each light polarizing layer is then coated with a photo-sensitive resist. This coating is Kodak Ortho Resist or KOR. a tough, new plastic which can be applied in liquid form to almost any surface, forming a water-insoluble and waterresistant coating. After exposure to light, non-exposed areas develop away in organic solvents, leaving a resist pattern. KOR also is one of the few substances which will adhere tenaciously to the dyed polyvinyl alcohol light polarizing layers of the film. Coating is accomplished in a machine of our own design and manufacture. Operating at a speed of 50 feet per minute, the machine automatically applies a 1 10 mil layer of KOR to both sides of the . i'A {' V«^ 9W^^t^^. y ^ Tcchiuimalitm I'.v /;riiii;i(if,' aiiiinatcd moicment to the miniature ^5mm .ijicle through iw of pnhirizpil light polarized film. The coated film is then solidified in a special drying cabinet and taken up on a collection spiKil. Cooperation Made It Possible The c(X)f)eration of Polaroid Corporation in supplying the basic film stock has been of material assistance in our ability to produce slides economically and in mass quantity. Moreover, because the KOR-coated film enables us to use a direct photographic process, we are able to provide a maximum of animation in the slides In production, the original color artwork for each slide is prepared full-size by our artists. The fullsize animation art is prepared in outline on white paper rather than on the light polarizing film stock as is the case in our technique of making large transparencies. This is because the film stock is light polarizing in the polarizing directions or axes that we require to start with. graphic subject, a complete image with the areas to be animated specially designated or blacked out, is then photographed by a special pin-registered copy camera and developed as a negative image. The color artwork is photographed on the same pin-register camera and developed to form an Eastman 5251 color master negative. Both black and white animation negatives and color negatives are prepared in 8" x 10" size and punch-registered, using the Kodak punch system. 3 Exposures on Each Slide The negatives are then put into a special optical printer and are used to make the positive prints for our slides. Each "Technamated" slide we manufacture is the result of five separate exposures in this printer, one for each of the four animation image portions or sequences required and one negative for use in preparing a fullcolor print of the photographic subject. The printer provides spe The animation art or photo \ow the polarized film is being coated uith Then the coated polarizina film is dried Kodak Ortho Resist before being, exposed ■ . . ihe specialhj-buili dnjing cabinet below ■ cial lighting for both black-andwhite and color photography and insures that all elements are in perfect registration. One of each of the animation negatives is mounted on the stage of the printer. A powerful light source projects the image forwardly through the negative onto the 35mm polarizing film stock coated with photosensitive resist. The light passing through one animation negative produces exposure of one side of the coated polarizing film. The film is reversed and a second animation negative is used to expose the other side of the coated film. This means that we have two animation positives exposed on opposite sides of the same frame of polarizing film that have been made possible by the fact that no light has penetrated through the film because the polarizing axes of the polarizing layers are at right angles to each other. The procedure is repeated for the second assembly of Final step: Technamated filmstrip is checked for registration of the polarized animation. t m