Patent GB-385494-A (GB)
Title: Improvements in or relating to apparatus for recording and reproducing sounds on or from films and discs
IPC: G11B11/00
Filed: 1932-03-31
Abstract: 385,494. Sound recording and reproducing apparatus. DELANNOY, L. A., 45, Rue Villiers de L'Isle Adam, Paris. March 31, 1932, No. 9292. Convention date, April 9, 1931. [Class 40 (ii).] Apparatus for optically recording sound on films or discs alternatively and for reproducing sound from such records by a pick-up after their treatment by photo-engraving methods to produce grooved traces comprises a base supporting two adjustable mountings one of which carries an optical recording apparatus and a pick-up device and the other carries a casing enclosing a rotary carrier for a film and a disc and has two windows in sides at rightangles to one another. Fig. 2 shows a base B supporting a plate p adjustable about a vertical pivot and carrying a pick-up a<2> and an optical recording device 40 slidable on the plate. The base also supports a plate 14 on which is mounted, by a vertical pivot, a casing b housing a mounting 19, Fig. 4, for a shaft 31 carrying a film reel 21, 22 and a plate 33 for a record disc. The record can be made on the film f as it is fed from the inside to the outside of the reel over feed rolls 29 and a guide roll 30 arranged opposite a window 9 in the casing, through which window a beam oscillated by an oscillograph 3 influenced by a microphone is directed through a lens system 5 on a slide 7 mounted in guides 8 on the casing. To record on a disc mounted on the plate 33, the lens system 5 is transferred to guides in front of another window 9a in the casing opposite to the disc, the window 9 being covered, and the casing is rotated through a right-angle so that the system 5 is opposite the oscillograph apparatus 3 which is adjustable along its supporting plate p. The film reel is constructed with two annular plates 21, 22 supported peripherally by rolls 20 carried by brackets 19a, 19b on the mounting 19, and the inner coil bears on rollers 26a supported on the brackets and driven by internal teeth on a flanged wheel 24 on the shaft 31 to feed off the internal coil between one of the rollers 26a and a pressure roll 26b so that it passes with lateral displacement over a cone 28 on the shaft and over the rolls 29, 30 to the outside of the reel. The reel is driven through friction rolls engaging a ring 21<1> on the plate 21 and the side of the wheel 24, and the shaft 31 is driven through reduction gear from a shaft 17 carrying a motor. The casing b is traversed for recording on the disc or for making a continuing spiral on the endless film by a part nut 15 engaging a screw 16 driven at a speed suitably related to the drive of the reel. The optical records thus made are treated to produce the trace in the form of a groove, and are reproduced in the apparatus by rotating the plate p on its vertical pivot so that the pick-up a2 can be brought in front of the-record with its needle or sapphire projecting through the window 9 or 9a to engage the groove. The apparatus may be used in transposing a record of one type, for example a variable density optical record, into a record of another type by replacing the microphone supplying the recording current with a lightsensitive cell influenced by a beam directed through the record.