Patent GB-955521-A (GB)
Title: Photographic apparatus and products useful therein
Inventor: WAREHAM RICHARD ROGERS
IPC: G03B17/52
Filed: 1962-03-02
Abstract: 955,521. Film assemblies. INTERNATIONAL POLAROID CORPORATION. March 2, 1962, No. 8227/62. Heading G2A. A photographic film sheet or sheets has a first leader connected with a second leader at a distance from the leading end of the second leader, the first leader being flexible and having its leading end extending forwardly of the leading end of the second leader; a major part of the first leader can be readily detached at a predetermined location at or adjacent to the connection with the second leader. In the form shown in Figs. 1 and 2, a film unit consists of a photosensitive sheet 16 and a print-receiving sheet 22. Sheet 16 has a short leader sheet 20 and a short trailer sheet 18. Sheet 22 is mounted on a carrier 24, which has a leading end section 28 and a trailing end section 30. Carrier sheet 24 has a rectangular aperture 25 overlying sheet 22 and defining the area thereof over which processing fluid is spread to form a transfer print. The fluid is provided in a rupturable container 32 mounted on end section 28 of carrier 24. The first sheet 16 and second sheet 22 are secured together in the appropriate register by clip members 36 attached across the leader portions of the two sheets. The film units are used in the form of camera shown in Fig. 5. This has a rear chamber 48 defined by walls 44, 46, and a lower chamber 58 defined by walls 54, 56. The two chambers join in communicating fashion to form a passage 62 having a slot-like opening 64. Adjacent opening 64 are a pair of pressure rollers 66, 68. The camera opens on a hinge 70 to permit loading, both rollers being displaced from wall 60 of passage 62, so that a leader can be threaded between roller 68 and wall 60, instead of between the rollers. As shown in Figs. 1 and 2, sheet 22 carries at its forward end two leaders: a short stiff leader 74, and a longer flexible leader 76. Leader 76 is joined on to the leading end section 28 of sheet 22 by a narrow neck portion 84, so that it can easily be torn away when no longer required. In loading the camera, the print-receiving sheet 14 (or 22) is inserted into the lower chamber 58, and the photosensitive sheet 16 (or 12) into the rear chamber 48, which latter has an exposure aperture 50 through which an image is received on sheet 16. The long flexible leader 76 is drawn round the outside of the roller 68 (Fig. 5). When this is subsequently pulled, the film unit is drawn down until the stiff leader 74 projects between rollers 66, 68, and can be grasped. Leader 76 is now no longer required, and can be simply torn away. Leader 74 can now be grasped and pulled so as to draw the whole unit between rollers 66, 68, the fluid container being ruptured and the sheets processed in the usual way. When a number of such film units are supplied in pack form, the two sets of sheets (photosensitive and print-receiving) are housed in separate envelopes, and the leaders 76 can be of graduated lengths for ease of manipulation.) A dark slide of opaque paper may be provided, with a separate leader, enabling it to be withdrawn when the first exposure is to be made. Specifications 684,572, 714, 412, 855, 843 and 878, 863 are referred to.