US1748383A - Controlled-aperture scanning disk - Google Patents

Description

f 1930'. c. F. JENKINS 7 1,748,383

' .CONTR OLLED APERTURE SCANNING DISK Filed June 8, 1927 4 Sheets-Sheet l Feb. 25; 1930. ENKI 1,748,383

' CONTROLLED APERTURE SdANNING DIS K Filed June 8, 1927 4 Sheets-Sheet 2 9am ntoz Feb. 25, 1930.

Q F. JENKINS CONTROLLED APERTURE SCANNING DI SK Filed June 8, 1927 4 Sheets-Sheet Feb. 25, 1930. m m; 1,748,383

CONTROLLED APERTURE SCANNINGDISK Filed June 8, 1927 4 Sheets-Sheet 4 5 'I' :0, f 2 a E.

Patented Feb. 25,1930

" UNITED STATES PATENT oer-ICE omnrms rumors .rrmxm's, or wasnmeron, nrsrmcr or COLUMBIA, ASSIGNOR ro mnxms monnronms, or wnsnme'ron, nrsrnrc'r or COLUMBIA, A con- Pomrrou or'rrm nrsrnrcror Cowman Y CONTROLLED-APERTURE SCANNING, DISK Applicationfiled June 8, 192:7. Serial No. 197,453.

- This .invention relates -to the electrical 7 transmission of motion pictures, and has for its particular object means for scanning a picture surface w1th multiple pencils of light controlled separately.

-Powerful searchlights 'are now available,

is, therefore, necessary to employ other means This is attained in the present invention by interposing an indestructible scanning disk in the light beam, and building up the projected pictureby opening and closing the apertures of the disk by a-master motion picture.

With this and other objects in view the invention consists in the novel details of construction and combinations of parts morefully hereinafter disclosed andp'articularly I pointed out in theclaims.

T In the drawings like symbols refer to like parts in which Fig. 1 is an elevation of the projector; Fig. 2 a schematic drawingof the master control picture mechanism; Fig. 3 the 3 5 scanning disk, and Figs. 4, 5 and 6 details of the several mechanisms.

In the figures, A is a Searchlight, trunnioned ina frame B. C is .a latticed framework attached to the lamp and extending in i 40- 'the-direction of'the light beam. This lat ticed frame carriesat its far end a lens D. In

the back focus of the lens is a rotary scanning disk E, driven'by a motor F; v

a On the scanning disk each aperture is closed by shutters G (Fig. 3), mounted on pivots G (shown in detail in Figs. 4, 5 and 6),

' with bellcrank attachment to rod G 1 The lower crank end of. G engages with the bar -'H of the armature J of the electro magnet K. TTlTeTearesix of these magnets, duplicates of the HJ -K unit, amagnet unit for each aperture of the six apertures of the radial rows of apertures. Each HJ.K unit is stationarily fixed. As each row of bellcranks passes these magnets each of the six 3 aperture shutters is opened by its particular magnet-armature bar H for so long as light is needed through that aperture to build up the motion picture projected on the clouds.

- The six magnets are attached by wires to brushes M, one magnet to eachbrush. These "brrishes bear upon six adjacent rings of commutator segments N, eight'segments to each ring. These segments are connected by wire 0 to six corresponding brushes P on disk Q.

The rotation of the disk sweeps these brushes P overthe face of each of the frames. R .of the motion picture ribbon S. a 4 The individual frames are each a zinc etching, or other suitablejmaster frame, and the brushes sweeping ovker. the face vof these 1 frames make contact with the high parts of the picture to close an electric circuit, the return wire of which is common to all. Each of the several. frames of the motion picture series differs from adjacent frames, .much as the frames of cartoon film do, so that'theseseveral frames projected on the clouds in rapid sequence, as explained below, produces the illusion of motion pictures.

The operation of the device is as follows .Thearc being struck, and the motor started, the rotating scanning disk intercepts the light beam except where the apertures are opened by the electro-magnet unit H-J- -K activated by the current through the brush contacts on the zinc etching to build up a motion picture in the sky. 7 Thus- The brush-carrying disk Q, and the scanning disk E rotate synchronously. The high spots of the picture of each frame R sends ;current through the proper ,electro-fnagnet, pulling .down the bar H (to the dotted pos tion, Fig. 6) to open the corresponding aperture of the scanning disk, permitting lightto reach the cloudscrecn at the proper time, and thus build up a fae-simile picture.

' While corresponding aperture shutters G of each'ra'dial group on the scanning disk are placed at different radial distances, the lower to open and close all the shutters.

Thearmature bar H is of length which permits holding open each shutter in succession for the full width of the picture scanning movement. I 4

' Obviously I do not wish to limit myself to the employment of only the mechanism shown, for this could be modified. But any 5 multiplelight-beamintercepting device which can be so controlled by a master-record to reproduce the record at the distant plane of contact of the beam would answen The word light-pencils is used herein to distinguish the light which passes the scanning apertures, the composite of which make up the light-beam.

What I claim, is: Y

1. The combination of alight-beam projector, and rotary intercepting means having apertures. and means for opening and'closing said apertures for permittingjthe passage of said light-beam for only predetermined areas.

and times.

2. The combination of a light-beam projector, rotary intercepting means having apertures, and means carried by the rotary intercepting means for covering and uncovering said apertures for permitting the passage of said light-beain for only predetermined areas and times, and a' master control means i 1 disk, and means carried bysaid disk for cl0s- .connected to said intercepting means for giving a definite order to said projection areas and times.

3. A multiple-apertures rotary scanninging and opening said apertures separately.

4. A multiple-apertured rotary scanning device, and shutters carried by said device in the rotation thereof for limiting the light which may pass eachaperture. I

5. In a scanning'apparatus, the combination'of a plurality of sets of lightvalves, means for determining the order in which,

each set is to be effective in scanning, and

meansvfor operating predetermined valves in each set.

. 6. In a scanning apparatus, the combina tion of a plurality of sets of light valves, means for determining the order'in which each set is to be effective inscanning, and electrlcalmeans for variably operating one or more valves in eachset.

7 In an image reproducing system means each set of light valves in operation in cyclic order. V,

8. In an image reproducing mechanism a light beam. a pluralit of sets of light valves, 7

each set adapted to e moved insuccession across said beam, means for rendering each set effective only as it is crossing said beam,

' and means including a travelingpicture film for controlling the eifectiveness of each valve in the particular set that is crossing said light heam. a

9. The combination of a surface having electric-current-contacting graphic representations thereon, scanning means comprising a plurality of.; circuit terminals contacting successively with saidscannedsurface, a light v beam electrically controlled by said contacting terminals," and a perforated scanning disk having a plurality of sets of light valves, means for rotating said disk to cause eachset CGSSIOH.

In testimonywhereof I have afiixed my signature. v

CHARLES FRANCIS JENKINS.

of light valves to traverse said beam in succomprising a plurality of sets of imageana- 'lyzers, each set adapted successively "to traverse theimage, and means including a plurality of sets of light valves controlled by sald analyzers, and means for bringing

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