Patent GB-1099021-A (GB)
Title: Apparatus for optically recording binary coded data
IPC: G06K17/00
Filed: 1965-01-28
Abstract: 1,099,021. Optically recording coded data. FMA, Inc. Jan.28, 1965 [Oct.12, 1964], No.3861/65. Headings G2A, G2C and G2J. Fig.1 shows a single film frame 10 having a reproduction of a document 11 recorded on one area and a block of code 12 which indexes or identifies the document. As shown, the block is in two main sections 13a and 13b, each section being divided into seven vertical columns and twenty-eight horizontal rows. Thus each section has 7 x 28 square-section "bits", some of which are opaque and some translucent, thus representing the "zero" and "one" digits of a binary code, the particular pattern of opaque and translucent "bits" representing a code identifying one particular film frame. The continuous vertical bar 14 is a frame marker for timing or synchronization. A series of short bars 15 synchronize with the code rows, one to each. Two more vertical bars 16a, 16b, one translucent and one opaque, act as synchronizing markers. The apparatus is concerned with the transformation of some other coding system, such as for example punched cards, to the coding system shown in Fig.1. Fig. 2 shows a block 23 of squaresection light-conducting rods, arranged in two sections 23a, 23b, each section having seven columns and twenty-eight rows, so that they correspond to the square "bits" of the code section of Fig.1. Between sections 23a, 23b are a glass bar 23c and a metal bar 23d, which produce the bars 16a, 16b on Fig.1. An apertured bar 23e and a further bar 23g produce the synchronizing markers 14, 15. The film on which the code record is to be made is placed against the top face of the integrator block 23, i.e. the face visible in Fig. 2. The light source and the coding mechanism is placed below this block, and is shown in more detail in Fig. 3. Between the light source 24 and the integrator block 23 are two masking plates 25, 26, each having a pattern of holes (25a, 26a) corresponding to the row-and-column arrangement of rods in block 23, the two patterns being in register. Between the two masking plates are two sets of opaque rods 27, 28, one set crossing the other at right angles. These rods again correspond to the row-and-column arrangement of the integrator block. Each rod has a series of holes (27a, 28a) along its length, the location of the holes again corresponding to the row-and-column pattern. Each rod has a bar magnet (34) Fig. 5 (not shown) let into it at one end, which lies between the polepieces of an electromagnet (41) Fig. 6 (not shown). Normally the rods lie with the holes in an inclined position (as in the outer two rods 28 shown in Fig. 3). Thus no light from the source 24 can pass through them. When the electromagnet is energized, however, the rod is rotated so that the holes therein take up a vertical position, as in the central rod 28 shown in Fig. 3, so that light can now pass through them. If the corresponding hole in rod 27 is also rotated into a vertical position, light from the source can now pass through the holes in both rods, and through the registering holes in the masks, to the corresponding light-conducting rod in block 23. This conveys the light to the sensitive film, and forms an image of one square "bit" in the appropriate position. Each rod 27 or 28 in every row or column is controlled by a separate electromagnet, these being shown diagrammatically at 20, 21. Energization of the magnets is carried out in a controlled sequence by electronic pulse circuitry derived from the original code scheme (e.g. punched cards) which is being transformed. Beginning at one end, and proceeding to the other end, the "row" rods are energized one by one by the "row" magnets 20. Each time the appropriate "column" rods are energized, so that the appropriate holes are in alignment, and a row of square "bits" (some opaque and some translucent, according to the pattern of registering holes) is recorded on the film. This proceeds row by row, until a complete coding pattern of the kind shown at 13a and 13b is obtained.