US2084947A - Apparatus for reproducing sounds recorded on strips - Google Patents

Description

June 22, 1937. Q CZEUA ET AL 2,084,947

APPARATUS FOR REPRODUCING SOUNDS RECORDED ON STRIPS Filed Dec. 25, 1932 INVENTORS OSKA R CZ EIJA JOSEF' LEBZE LTER A NTON SCHERENZ'EL ?atented June 22, 1937 PATENT OFFICE APPARATUS FOR REPRODUCING SOUNDS RECORDED N STRIPS Oskar Czeiia, Josef Lebzelter, and Anton Scherenzel, Vienna, Austria, assignors to Selenophon Lichtund Tonbildgesellschait m. b. H., Vienna, Austria, a company of Austria Application December 23, 1932, Serial No. 648,688 In Austria December 24, 1931 Claims.

In the talking machines heretofore in use mechanically prepared sound records were used.

almost exclusively, for instance the well known gramophone plates. It would offer various ad- 5 vantages to depart from this method and to resort to photographic sound records heretofore mainly used in sound films. This would be of advantage also in connection with apparatus suitable for private use.

In the well known method of reproducing sound records prepared by optical and photographic means in general, a record carrier in the form of a strip is used, whereby a number of particular advantages is secured. The employment of 15 the optical and photographic method of recording permits the recording of sound vibrations in within a much wider range of frequencies than can he usually arrived at, for instance in gramophone discs. Moreover the strip shaped record 0 carrier permits an almost unlimited length of the records to be obtained, and also the arrangement of a plurality of music records etc., in any succession. Furthermore a strip shaped record carrier may include a plurality of records. It

25 is possible to make the record carrier of a transparent material, in which case thereproduction is advantageously eifected by transmitted light; or the record carrier may be made of an opaque material, in which case the record is read by in- 30 cident or reflected light. I

An apparatus permitting all the advantages above mentioned to be utilized, must also be simple in construction and reliable in operation so that it may be handled by unskilled persons.

35 Furthermore the apparatus must be made simple also for the reason that it may be cheaply made at a large commercial scale. The reading of the record being effected by a light sensitive cell it is also indispensable to make use of an amplifier 40 permitting currents of an intensity required for instance for the operation of a loud speaker, to

be derived from the weak currents furnished by the said-light sensitive cell.

According to the present invention such an 45 apparatus for the reproduction of sound from strip shaped record carriers is so constructed that it may be used for as many purposes as possible, that is to say, theamplifier already present for amplifying the currents of the cell sensitive to 50 light is advantageously utilized also as a receiver for broadcast radio transmission. For permitting reproduction from ordinary gramophone records, the amplifier is so constructed that an electric sound box may be connected to the same. 55 In order to enable gramophone records to be reproduced by the same apparatus, the part of the apparatus serving for the feed of the strip shaped record carrier is so proportioned that the normal speed of the gramophone discs, 78 revolutions per minute, is secured. The possibility of using the apparatus in various ways does not only permit use of the apparatus in the three ways above indicated separately, but also combined use thereof; for instance as a broadcast radio receiver and an optical talking machine simultaneously, or as a gramophone disc reproducer and an optical talking machine simultaneously. Also accessory parts may be constructed according to the invention'which permit the completion of already existing amplifying apparatus of any kind, so as to realize the above said combinations.

In the apparatus heretofore used the structural elements used in sound film reproducing apparatus are generally resorted to, so that complicated and expensive means for uniformly feeding the record carrier must be provided. In this connection for instance the difficulties may be referred to which arise by the use of toothed wheels, since for equalizing the irregularities of the engagements of the toothed wheels special mechanical means must be provided. The simplest apparatus known up to now for reproducing optical sound records, in which apparatus small, nonperforated strips serve as record carrier, the latter is fed by the pull of the winding up drum or-by the pull of a separated feed wheel suitably controlled by extraneous means. The uniform running of the record carrier at the point where the record is read is secured by masses acting in the manner of a fly wheel in clutch engagement with the ,record carrier. For avoiding all these disadvantages and for simplifying the construction of the apparatus in the latter, an arrangement is provided in which no toothed wheel is made use of and in which no equalization of speed by fly wheel action is required owing to a simplification of the drive. The desired operation is arrived at according to the invention by the use of a feed Wheel for the record carrier of a roller of sufilciently large periphery and of a sufficiently high adhesion on the record carrier, the said roller being driven through the medium of a uniformly operating friction wheel gearing by a driving electric motor in direct clutch engagement with the said roller. The result of this arrangement is that, in the first place, owing to the large surface of contact between the feed roller and the record carrier, the latter is driven without appreciable slip. Furthermore since the feeding speed of the strip and therefore also the circumferential speed of the feed roller aregiven,anangular. .peedofthefeedrollerof '78to80revoluiionsperminutemaybereadib arrlvedat,thatistosaythesame angularspeed that is normally required for gramophone disw. According to theinvention the ratio of the friction wheelgearlngismadenottoosmall, for instance with a motor of 1500 revolutions per minutethisratiowlll be about 1 to 18,,thus securingthe normal gramophone discspeedof 80rewolutions perminute. fihis number of revolutions as alsothediameterofthefrlctlonfeed roller for the record carrieris defined; in the ease of records forthenormal sound iilm'speed of 456 millimetrespersecondthediameterofthefriction feed rollerwiil be about 109 millimetres.

'l'hedriveofthefeedrolleraccordingtotheinvention may be equally used for the apparatus In apparatus for reproducing optical sound. records it is of great importance to facilitatetheir handling as far as possible. Therefore the winding up and the \mwinding rollers, and also theguide andthefeedrolleraaresoarranged thatthepathoftherecordearrierisassimple as possible. Furthermore, all rollers are disposed socloselyaboveaplaneeoveringplatethatthe insertion of the fore end of the record carrier and thelaying of thesamearoundthevarious rollers takesplaceinpropersucceasiomandthat at the moment of starting the apparatus and tightening the strip. the latter is automatically pressed against the proper point. The covering plate prevents the strip from sinking, for instance, into too low a position, from being led round stationary shafts, etc.

Furthermore by the aforesaid auxiliary strip not only the handling is facilitated, but as experience teaches, it is also made possible to automatically stop the apparatus after playing the record carrier by means. of marks, indentations or the like on the auxiliary strip or on the record carrier. The automatic stopping may be eil'ected liq mechanically or also for instance by controlling the beam of light falling on the light sensitive cell. For instance by an indentation of the strip anintensebeamoflishtmaybegivenaccessto thecellorthelike. Bcsidesthevariouspartsof the invention above referred to in the apparatus according to the present invention may also be provided with a device for multiplying at will the speed of the record carrier in order that, if at any time an interruption of the sormd reproduction just taking place, is desired, the entire sound record may be nm off as rapidly as posible. Such a device may be readily built up by means of friction wheels of different diameters mounted on the motor shaft and adapted to be thrown into and out of gearing as may be required.

In the drawing Fig. 1 is an elevation and Fig. 2 a plan view showing diagrammatically by way of example an embodiment of the present invention.

Intheseflgures lisabaseplatehavlngmounted at two corners thereof two rollers 2 and 3 having wound thereon the record carrier, roller 2 being for instance the supply roller and roller J the winding up roller. The record carrier passes from the supply roller 2 round a guide rollerl andpastalight gate 5 circularin shape, as here shown, and then round the feed wheel 6 andpastapressurerolleritothewindingup roller 3. The plan view Hg. 2 also indicates the two devices for optically reproducing the sound record by transmitted or reflected light. For this purpose serves the source of light I, which proiects, by means ofa suitable well known system oflensesinacasing!,anintenseluminousthin line of light onto a light sensitive cell ll, through the light gate 5. Owing to the uniform rotation of the feed wheel 6 the record canier is moved with-uniformspeedpastthe htgate 5. 'Ihis arrangement is used when the record carrier is transparent. When the record carrier is opaque, for instance one consisting of paper then two soln'cesoflightincasingsli and llareused,

projecting light through lenses on the reading point II. A suitable system of lenses ll projects an image of the intensely illuminated part I! of the record through a suitable diaphragm ii onto a light sensitive cell IS.

The mechanical part of the apparatm is more clearly shown in elevation in Fig. l. The hue plate i is provided with bearings 24, 25 for the tworollers 2 and 3 and abearing 2i forthe feed wheel S the shaft of which carries below the base plate I a frictional gearing comprising the two wheels i1 and II, II being the smaller driving wheel on the shaft of the electric motor is while it is covered with rubber for obtaining the necessary friction and has the required angular-speed ofthefeedwheel. Theotherendoftheshaft of the electric motor is preferably serves for drivingtheshaftofthewindingllprollerl by a worm and worm wheel 2|. As already stated theshaftofthefeedwheelhasthenormal number of revolutions for reproduction from gramophone discs and, as indicated in dotted lines, such a gramophone disc can be simply pushedontothetopendoftheshaftofthe feed wheel 5. The gramophone disc 2| cooperates with a conventional sound box 23 in the usual manner as indicated in Fig. 2 in dotted lines.

In order to facilitate, as already mentioned, the insertion ofthestrip shaped record carrier, a covering plate 22 is provided, which is arranged just below the lower edge of the record carrier, and mounted in such position, that with a loosely inserted record carrier, on starting the apparatus and the tightening of the record carrier due thereto, the proper position of the record carrier relatively to the guide rollers and other parts is secured.

That we claim is:

1. An apparatus for sound reproducing comprisingashaftconstructedand arrangedtohave a" gramophone disc pushed onto the top end thereof, a toothless feed wheel on said shaft below said top end adapted to feed a band shaped optical record carrier without requiring perforations therein, a sound box adapted to cooperate with said gramophone disc, a cover plate, and a supply roller and a winding up roller mounted n ar the corners of said plate and in the plane of said feed wheel, whereby adjacent portions of the peripheries of said rollers underlie the overhang of said gramophone disc and more remote portions thereof extend beyond said cover plate, frictional gearing carried by said shaft below said feed wheel, and a motor constructed and arranged to drive said frictional gearing and thereby drive said shaft at the normal number of revolutions for reproduction from gramophone discs.

2. An apparatus for sound reproducing comprising a shaft constructed and arranged to have a gramophone disc pushed onto the top end thereof, a feed wheel on said shaft below said top end and adapted to feed a band shaped optical record carrier, a sound box adapted to cooperate with said gramophone disc, 9. supply roller and a winding up roller mounted in the plane of said feed wheel, means for directing a thin line of light onto said band at a point in its path between said rollers and under the area defined by said gramophone disc, and a light sensitive cell responsive to said light cooperating with said band at said point.

3. An apparatus for sound reproducing comprising a shaft constructed and arranged to have a gramophone disc pushed onto the top end thereof, a feed wheel on said shaft below said top end and adapted to feed a band shaped optical record carrier, 2, sound box adapted to cooperate with said gramophone disc, a supply roller and a winding up roller mounted in the plane of said feed wheel, means for directing a thin line of light onto said band at a point in its path between said rollers, and a light sensitive of small diameter on said motor shaft, a second friction wheel of large diameter on said feed wheel shaft and in direct engagement with said first friction wheel,

4. An apparatus for sound reproducing comprising means for supporting a band shaped record carrier for movement along a predetermined path, a feed wheel adapted to feed said carrier, a plurality of sources of light simultaneously illuminating a predetermined reading point in the path of said carrier in a plurality of directions, 9. light sensitive cell, and means for directing light reflected by said carrier at said reading point from both said light sources to said light sensitive cell, a second light sensitive cell, means for directing a thin line of light through said band to said second cell at a second predetermined reading point, the shaft of said feed wheel being constructed and arranged to have pushed onto the top end thereof a gramophone disc defining an area overlying both of said predetermined reading points.

5. An apparatus for sound reproducing comprising means for supporting a band shaped record-carrier for movement along a predetermined path, a feed wheel adapted to feed said carrier, a light gate at a predetermined point in said path, a light sensitive cell, and means for projecting light through said gate to said cell, a pair of sources of light simultaneously illuminating a predetermined reading point in the path of said carrier in a diiferent direction, a second light sensitive cell, and means for directing light reflected by said carrier at said reading point from both of said light sources to said light sensitive cell, the shaft of said feed wheel being constructed and arranged to have pushed onto the top end thereof a gramophone disc defining an area overlying said first light sensitive cell and the reading point for said second light sensitive cell.

OSKAR CZEIJA. JOSEF LEBZEL'I'ER. ANTON SCHERENZEL.

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