US1927754A - Television scanning device - Google Patents

Description

Sept 19, 1933 J. M; ROBINSON 1,927,754

TELEVIS ION SCANNING DEVICE Filed Sept. lO. 1932 Ei 43mm,

Jaim; Mzwn @3M fm www Patented Sept. 19, 1933 UNITED. STA

signor of one-fourth to Thomas man,rDubois County, Indi Andrew Gos- .Application september 10, 19312 serial No. Iss/2,603

8 Claims., (Cl. l78-6) This invention relates to a television device and has for an object to `provide an improved scanning apparatus for use in television devices, it being an object of this invention to provide a scanning apparatus which may be used for either transmitting or for receiving transmitted television images. A further object of this invention is to provide an improved scanning apparatus for television devices comprising two overlapping intersecting scanning disks, each scanning disk being providedwith a plurality of slots therethrough.

vA furthery object of this invention is to provide a scanning disk having a plurality of apertures therethrough and to provide behind each aperture a movable scanning plate having an angular slot, which angular slot will beheld in a predetermined position as it moves acrossv a 'frame and is overlapped by an intersecting angular slot on a companion rotatablev scanning disk." Ay further-object of this invention is to provide means for holding the scanning slot of a movable scanning platedon a rotatable scanning diskat a predetermined angle as the rscanning vslot isv intersected by an angular slot on an overlapping companion scanning disk. Yet an additional object of thisinvention is toV provide a means for holding the scanning slot anda movable plate on a scanning disk at a predetermined angle, which means will be oper'ated automatically by the rotation means of the two scanning disks, so that the scanning plate will always move in proper synehronism with both scanning disks without the necessity of further attention.

With the foregoing and other objects in view, as will hereinafter become apparent, this invention comprises the constructions, combinations and arrangements of parts hereinafter set forth, disclosed and shown on the accompanying drawing. In this drawing,

' Figure 1 is a front elevation of the invention fshowing the scanning disks, said `disks being -partly broken away, I Figure 2 is a rear View of same showing gearing for operating scanning disks, and

` Figure 3.is a sectional view taken on line 3--3 of Figure 2, also showing neon lamp or any other suitable lamp and viewing lens; f n

The scanning apparatus 10 constituting this invention may be used either with the television apparatus for transmitting images or with the television apparatus for reproducing images. As clearly shown in Figurev 3 a television apparatus `determined number of revolutions `lution of the disk 15.

for vreproducing pictures is schematically shown, a neon tube 12 receiving transmitted electrical impulses reproduces the electrical impulses into lightv impulses Ywhich passV throughthel frame,

schematically shown at 11, and the Vscanning apparatus V10 to a protecting lens schematically shown at 13. Thescanning 4apparatus 10 consists. of two rotatable disks 14'and 15, the ,I otatable` disks 14 and 15 being each rotated from a corn-V mon power shaft 16 to a suitablegearingmechanism or train 17, the gear mechanism being so selected that the disk 14 will make a desired pre.- ior each revo- The gear mechanism orL train 1,7 consists-of a' drive gear 18 driven Aby a screw'pinion 19.0171 power shaft 16. A-large pinion 20 integral withr las PATENT ,f0FF 1.cE-yffi the gear 18 operates through gear 21, 22 vand 23 n to rotate the pinion 24 on the shaft 25 on. which the disk'14 is mounted. A small pinion, 26, like- `wise integral` with the drive gear r18,` meshes lwith the gear 27 on a hollow shaft 28 on; which the disk 15,is mounted. The disk14 .isz provided with a plurality of angular-circumferenti- .ally spaced Vslots 30,vv which passsuccesSvely across the frame llas the. disk 14 'is rotated. Thev disk 15 is provided with a plurality of apertures 31, Vwhich `likewise passsuccessively across the frame 11.

As will be obvious from the gearing nism 17, as shown inFigure 2, the disks i14 and 15 rotate in opposite directions,.the disk 14 32 will be pivoted `about its pivot 34 an amount i just' sufcient to compensate for. the rotationof the pivotl 34 about the center of the disk 15..

Each scanning plate 32 has its other end formed into a boss or projection y35-which ispivotally mounted at 36 on a bell crank 37,-1 A spring 38 secured at 39 to the disk k15 pressesagainstfthek Vboss orvprojection 35 and vtendsgto-hold lor to return the scanning plate 32 to its non-'moving position.

link 40 to'a s1ide Iarm 41` which passesthrough a slide guide 42. Thefdfree end of the slide-arm 41 presses against the circular plate 43 mounted on` the stationary shaft 44 through the` hollow uimecha'l? 185 The bellcrank 37 is pivotally connected by .110 shaft 28.', vProjecting fromV one ,sideoi the cIrouest` lar plate 43 is a cam 45 in the path of the free end'of the slide arm 41, the cam 45 being substantially in alignment with the frame 11, causing the scanning plate32 to pivot as v'itk 'passes `the frame 11 to hold the scanning slot 33 at substantiallythe same angle as it crosses the frame 11.l .As soon asthe scanning, slot 33 has passed beyond the end of the irame 11, therslide arm 41 will have passed beyond the end of cam 45, allowing the spring 38 to return the scanning plate 32 to the normal position.

In operation, the two scanning disks 14 and 15 will be rotated in the predetermined ratio to each other` by means of the power lshaft 16, and as each scanning plate 32 behind its aperture 31 passes across the frame 11, it willrbe tilted by means of the cam mechanism just 'described to hold the scanning slot 33 in substantially the same angle across the frame 11. Meantime, the angular slotl 11 will intersectr across the angular slot 32, allowing a beam of light' from the tube `l2'to passthrough the intersected slot in a plurality of substantially parallel paths, it being intended that the disks 14 and-15 will rotate at such a ratio toeach other that one angular slot 30 will pass across the frame 11, while the angular slot 33 moves only its own Width across the -frame 11, thusv causing the scanning rays to travel in a plurality of substantially horizontal parallel paths. v

The novel features and the operation of'this device'will be apparent from the foregoing description. While the device has been shown and the structure described in detail, it is obvious that this is not to be considered limited to the 'exact form disclosed, and that changes may be made therein Within the scope of what is claimed VWithout departing from the spirit of the invention. f

Having thus' set' forth and disclosed the nature of this invention, what is claimed is:

' 1. In a televisionapparatus, a scanning device comprising in combination a pair of scanning disks,-one of said scanning disks having a plurality of "angular slots vcircumferentially spaced thereabout, theother of said scanning disks having a plurality of .apertures circumierentially spaced thereabout, and a pivoted scanning plate Ymounted on said apertured scanning disk behind each aperture, each scanning plate having a slot yrality of angular slots circumferentially spaced thereabout, the other of said scanning disksl having a plurality of apertures circumferentially spaced thereabout, and a pivoted scanning plate `mounted on said apertured scanning'disk behind `each aperture, each scanning plate having a slot therein, said scanning disks beingv mounted in overlapping relation whereby said angular slots and said apertures Will intersect each other.

3. In a television apparatus, a scanning device comprising in combination a pair of scanning disks, one-of said scanning disks having a pluralityof angular slots'circumferentially spaced thereabout, the other of said scanning disks having a plurality of apertures circumferentially spaced thereabout, a pivoted scanning f plate mounted onl said apertured scanning disk behind each aperture, each scanning plate having a slot therein, said scanning disks being mounted in overlapping 'relation whereby said angular slots and said apertures will intersect veach other, and

means forzrotating each of said scanning disks in predetermined ratio to each other from a 4. In a television apparatus, a scanning device comprising in combination a pair of scanning disks, one of said scanning disks having a plurality of` angular slots circumferentiallyspaced thereabout, the other of said scanning disks having aY plurality of apertures circumerentially spaced thereabout, a pivoted scanning plate mounted on said apertured scanning disk behind each aperture,- each scanning plate having a slot therein, said scanning disks being mounted in overlapping relation whereby said angular slots andV saidapertures Will intersect each other, means vfor rotating each of said scanning disks in kpredetermined ratio to each other from a common power source,rand means for pivoting each scanning `'plate on said apertured disk asit is intersected by the angular slots on said other scanning 'disk to maintain the slot in'said scanning plate at a substantially constant angle.

5. In a television apparatus, a scanning device comprising in combination a pair of .scanningl disks, one of said scanningV disks having a plurality oi `angular slots Acircumferentially spaced thereabout, the other of said scanning disks having a plurality ofY apertures r'circumierentially spaced thereabout, l'a pivoted scanning' plate mounted on said apertured scanning disk behind each aperture, each scanning plate havinga slot therein, said scanning disks being mounted in overlapping relation whereby said angular slots andy said apertures will intersect each other, n

means for rotating each of said scanning disks 'y in predetermined ratio to eachother from a common power source, means for pivoting each'scanning plate on said apertureddiskas it is intersected by the angular slots on said other scanning disk to maintain, the slot in saidscanning'fplate at a substantially constant angle, said means comprising an rarm pivoted to the free end of each scanning plate, and a stationary cam actuating said arm as the disk rotates.

6. Ina television apparatus, a scanning device y comprising in combination a pair of scanning disks, one of said scanning disks having a plurality of angular slots circumferentially spaced vthereabout, the other of said scanning disks having a plurality of apertures circumferentially spaced thereabout, a pivoted scanning plate mounted on said apertured scanning disk behind each aperture, each scanning plate having a slot therein, said scanning disks being mounted in overlapping relation whereby said angular slots and said apertures will intersect each other, means for rotating each of said scanning disks in predetermined ratio to each other from a common power source, means for pivoting each ,1.35

scanning plate on said apertured disk as it is intersected by the angular slots on said other scanning disk to maintain the slot in said scanning plate at a substantially constant angle, said means comprising an arm pivoted to the free end of each scanning plate, a stationary cam actuating said arm as the disk rotates, and a spring means restoring said scanning plate to normal position after Ysaid stationary cam has been passed.

7. In a television apparatus, a scanning-device comprising in combination a pair of scanning disks, one of said scanning disks having a plural'- ity of angular slots circumferentially spaced thereabout, the other of said scanning disks hav- .ing a plurality of apertures circumferentially spaced thereabout, a pivoted scanning plate mounted on said apertured scanning disk behind each aperture, each scanning plate having a slot therein, said scanning disks being mounted in overlapping relation whereby said angular slots and said apertures will intersect each other,`

means for rotating each of said scanning disks in predetermined ratio to each other from a common source, means for pivoting each scanning plate on said apertured disk as it is intersected by the angular slots on said other scanning disk to maintain the slot in said scanning plate at a substantially constant angle, said means comprising a bell crank arm pivoted to the free end of each scanning plate, a slide arm pivoted to said bell crank arm, a guide for said slide arm mounted on said apertured plate, the other end of said guide arm being free, and a stationary cam in the path of said free end of said slide arm, whereby said stationary cam will actuate said slide arm and pivot the lscanning plate as it passes the path of intersection with the angular slot on said other scanning disk.

8. In a television apparatus, a scanning device comprising in combination a pair of scanning disks, one of said scanning disks having a plurality of angular slots circumferentially spaced thereabout, the other of said scanning disks having a plurality of apertures circumferentially spaced thereabout, pivoted scanning plate therein, said scanning disks being ymounted in overlapping relation whereby said angular slots and said apertures will intersect each other,y

means for rotating each of said'scanning disks vin predetermined` ratio to each other from" a common source, means for' pivoting` each scanning plate on said apertured disk as it is intersected by the angular slots on said other scanning disk to maintain the slot in said scanning plate at a substantially constant. angle, said means comprising a bell crankarm-pivoted to the free end of eachv scanning plate, a slide arm pivoted lto -said bell crank arm, a guide forsaid slide arm mounted on said apertured plate, the other end of said guide armbeing free, a stationary cam in the path of said free'end ofsaid slide arm, whereby said stationary cam will'actuate said slide arm and pivot the scanning plateasv f it passes the path of intersection with the `angular slot on said other Scanning disk, a yieldable spring mounted on said apertured disk adjacent each scanning plate, said yieldable spring perposition after said `stationary cam has been passed.Y

JAMES MICHAEL ROBINSON.

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