US2295443A - Television signal-translating system - Google Patents

Description

. P 1942- J. c. WILSON 2,295,443

I TELEVISION SIGNALTRANSLATING SYSTEM Filed April 23, 1941 2 Sheets-Sheet 2 FIG. 2v

FIG. 4.

INVENTOR OHN c.wu.so-

ATTORNEY Patented Sept. 8, 1942 TELEVISION SIGNAL- TRAN SLATIN G SYSTEM John C. Wilson, Bayslde, N. Y., assignor to Hazeltine Corporation, a corporation of Delaware Application April 23, 1941, Serial No. 389,860

13 Claims.

This invention relates generally to television signal-translating systems and, particularly, to such systems of of a type including a cathoderay tube having a target adapted to be scanned by a beam of electrons in translating a television picture.

Prior art television systems of the general type under consideration have generally been subject.

to one or more undesirable characteristics inherent in the particular scanning means employed in the system. Thus, a, television signal-transmitting system includin a signal-generating cathode-ray tube adapted to be scanned by an electron beam in a series of interlaced fields has the inherent characteristic that only the lines of the target corresponding to the field being scanned are discharged by the scanning beam during a particular field-scanning interval. I The image charge associated with any line at the time it is next scanned is that corresponding to the integrated eiiect of the corresponding line of the picture being translated over the time during which the intervening field or fields are scanned, due to the storage effect of cathode-ray tubes of the type under consideration. This integrated effect may be undesirable in a single-color television system, due to changes of the image occurring during the frame-scanning interval, but is especially undesirable in television systems in which a plurality of fields of different colors are translated. The reason for this is that, due to the storage effect of the cathode-ray tube, the image charge stored in any line of such a target electrode is that due to light of'more than one color, whereas, during the scanning of such a line oi the target electrode, it is desirable to have thereon an image charge due only to light, of a single color. v

Also in color television transmitting systems of the type utilizing a signal-generating cathoderay tube having a storage eflect as described, it is particularly desirable to cause light of a single color to be associated with a particular line of the target electrode for substantially the maximum time available in the. system without causing distortion of the type described above. If this is to be done, it is important that, immediately after a particular line of the target electrode has been scanned, there be associated with the line light of the color corresponding to the next scanning of such line. Several prior art arrangements have been provided for this purpose but, in general, they have not completely realized the desired result in that the lines of demarcation between lights of different colors do not follow the lines scanned by the cathode-ray beam of the tube as closely as is desired.

Disadvantages corresponding to those just described are present in television signal-receiving systems utilizing scanning arrangements corresponding in type to those just considered in connection with television signal-transmitting systems.

It is an object of the present invention, therefore, to provide an improved television signaltranslating system of the type under consideration which is not subject to one or more of the above-mentioned disadvantages of prior art television systems.

It is another object of the invention to provide an improved interlaced scanning system for television signal-translating systems.

In accordance with one embodiment of the invention, there is provided a color television signal-translating system comprising a cathode-ray tube including a target, mean for successively scanning the target with an electron beam in a series of similar fields of spaced parallel lines, and optical means associated with the target for forming an image of the translated television picture. The system also comprises means for changing the color of light associated with each line a given interval after such line is scanned and for maintaining this color associated with the line until the line is next scanned by the beam. The system also includes means in the above-mentioned optical means for effectively displacing the image associated with each line with respect to the scanning lines a given interval after the line is scanned and for maintaining the image displaced until the line is next scanned by the scanning beam, thereby effectively to provide interlacing of the scanning lines of the translated image. Additional means are included in the system for blocking the image to each line when changing the color of light and displacing the image associated with each line.

Also in accordance with a feature of the invention, there is provided a television signaltranslating system comprising a cathode-ray tube including a target, means for successively scan ning the target with an electron beam in a series of similar fields of spaced parallel lines, and optical means associated withv the target for forming an image of the translated television picture. The system also includes means in the optical means for effectively displacing the image associated with each line with respect to the scanning lines a given interval after the line is scanned and for maintaining the image displaced until the line is next scanned by the scanning beam, thereby effectively to provide interlacing of the scanning lines of the translated image.

In accordance with a specific embodiment of the invention, there is provided a color television signal-translating system comprising a cathoderay tube including a target, means for scanning the target with an electron beam in a series of parallel lines, and a drum having a plurality of similarly shaped apertures on the periphery thereof, together with color filters in predetermined ones of the apertures, the drum being interposed in the optical path between the target and the television image to be translated. This system comprises optical inverting means within the drum for forming corresponding inverted images of the translated picture substantially at two of the apertures, and means including means for rotating the drum for changing the color of light associated with each line a predetermined interval after the line is scanned and for maintaining the color associated with the line until the line is next scanned by the beam.

For a better understanding of the present iiivention, together with other and further objects thereof, reference is had to the following description taken in connection with the accompanying drawings, and its scope will be pointed out in the appended claims.

In Fig. l of the drawings, there is represented, partially schematically, a complete television signal-broadcasting system including a television signal transmitter and a television signal receiver, each embodying one or more features of the present invention; Fig. 2 illustrates in perspective a color-filter-carrying drum utilized in both the receiver and the transmitter of Fig. 1; Fig. 3 illustrates a light-refracting disc utilized in the transmitter of Fig. 1; while Fig. 4 is a diagram provided for the purpose of illustrating the operation of the retracting disc of Fig. 3.

Referring now more particularly to the drawings, the television transmitting system illustrated includes a signal generator l incorporating features in accordance with the present invention as presently to be described. The signal generator I0 is coupled to the input circuit of a transmitter ll of conventional type having coupled to the output circuit thereof an antenna system I2, l3. A scanning and synchronizing apparatus I4 is provided for the television signal transmitter of Fig, l and adapted to supply scanning fields for the signal generator in and synchronizing signals to the transmitter I l for modulation of, and transmission by, the radiated television carrier signal.

Referring now, more particularly, to the portion of the system of Fig. l embodying the present invention, signal generator I0 comprises a signal-generating cathode-ray tube 32 including a target or target electrode 33. The cathode-ray tube 32 also includes an electron gun of conventional design comprising a cathode 34, first and second accelerating anodes 35 and 36, and a collector electrode 31. The cathode-ray tube 32 also is provided with means, including line- scamning windings 38, 38 and field-scanning windings 40, 4|, for successively scanning the target 33 with the electron beam from cathode 34 in a series of similar fields of spaced parallel lines. The tube 32 comprises an envelope 42 having an elongated portion on the end of which is a photocathode 43 and surrounded by a focusing winding 44 for focusing electron images emitted by photocathode 43 upon the target 33. Thus, the tube 32 includes means for deriving an electron image from photocathode 43 and for focusing it on target 33. Operating potentials are supplied for the various elements of cathode-ray tube 32 from suitable sources illustrated as batteries 45 and 45.

Optical means are associated with the photocathode 43 and target 33 for forming on the latter photocathode and, through the action of focusing winding 44, for forming on the target 33, an electron image of the translated television picture which is represented by the arrow 53. This optical means includes a lens 5|, adapted to focus an image of the arrow 50 in the optical plane of a lens 52, and an image-inverting lens 53, adapted to form on photocathode 43 an image inverted with respect to that formed in the optical plane of lens 52. The signal generator of Fig. 1 also includes means, comprising a color-filter-carrying drum 54 interposed in the optical path between the target and the image to be translated, for changing the color. of light associated with each line scanned on target 'electrode 33 a given interval after such line is scanned and for maintaining this color associated with the line until the line is next scanned by the electron beam from cathode 34.

The manner in which the drum 54 is constructed is illustrated by the perspective view of Fig. 2. It is thus seen that the drum comprises a plurality of similarly shaped apertures on the periphery thereof, each of the apertures having a color filter therein so disposed that filters of similar color are disposed in diametrically opposite apertures on the drum's periphery. A spacing member 55 or mask separates each pair of adjacent color filters on the drum 54, this spacing member 55 effectively comprising means in the signal generator III of Fig. l for blocking the image of each line while the line is being scanned by the electron beam from cathode 34. As will be pointed out hereinafter, means are provided for rotating the drum.

The optical means of signal generator 10 also comprises means for effectively displacing the image associated with each line with respect to the scanning lines a given interval after the line is scanned and for maintaining the image displaced until the line is next scanned by the beam thereby effectively to provide interlacing of the scanning lines of the translated image. This displacing means comprises a light-refracting means illustrated as a transparent refracting disc 56 having its axis and surfaces inclined with respect to the optical axis of the lens system of Fig. l and adapted to be rotated by a shaft 51, which is displaced laterally from the optical axis of the lens system so that the shaft does not interfere with light transmission. Shaft 51 and drum 54 are driven by a motor 15 and the gear ratio of the driving means from motor 15 to these elements is such that disc 56 turns one-half revolution during the period any one of the color filters of drum 54 is being driven across the optical path.

The construction of the disc 56 is illustrated in Fig. 3 of the drawings. It is thus seen that the disc comprises two radial sectors 58 and 59. these sectors being composed of materials having different refractive indices. It will be understood that one of the sectors of disc 56 can be omitted, thereby using the refractive index of air in place of the refractive index of the sector of the disc 56 which is omitted, inasmuch as all that is necessary is that different refractive indices be provided in the optical path for different angular positions of disc 56.

The eflectof the disc 56 upon parallel light rays is illustrated by the diagram of Fig. 4. It 5 is seen that parallel light rays incident on the disc are displaced in a direction perpendicular to the path of the rays by an amount dependent upon the thickness, inclination, and refractive index of the disc.

The system just described with the exception of signal generator I!) represents a conventional television transmitting system. The construction and operation of such apparatus being well known in the art, a detailed description thereof is deemed unnecessary herein. In brief, however, in the operation of the apparatus described, an image of the scene to be transmitted is projected onto mosiac surface 33 of signal generator l0 and, in response to the action of the electron gun structure, video-frequency voltages are developed across resistor l5 at the input circuit of transmitter l I. Scanning voltages are developed in scanning generator l6 and utilized to control the generation of the video-frequency signals 5 developed across resistor l5, while suitable related synchronizing signals are also developed in scanning and synchronizing apparatus 1 4 and applied to the transmitter II for transmission on the radiated carrier signal. Thus, it may be seen that the electron gun structure and scanning means together comprise means for deriving a television signal from the target electrode.

In considering the operation of the signal-generating unit I0, neglecting for the moment the efiect of disc 56 and drum 54, it will be seen that an image of the object 50 is developed in the optical plane of lens 52 by lens 5| and that an image, inverted with respect to that at the optical plane of lens 52, appears on photocathode 43 as illustrated by the dotted arrows adjacent these elements. Furthermore, due to the electron emissive effect of the photocathode 43 and the focusing effect of coil 44, it will be seen that an electron image of the translated picture is 45 developed by the photocathode 43 and is focused on target electrode 33 of tube 32 where it appears as an image charge. If this image charge is scanned in a series of lines from top to bottorn by the cathode-ray beam of tube 32, a video signal will be developed across load resistor l5 in conventional manner,

Considering now the action of drum 54 and refracting disc 56, if drum 54 is rotated'in a clockwise direction synchronously with the field scan- 55 ning of tube 32 and in proper phase relation, the spacing members 55 thereof can be caused to block the light path corresponding to eachline of the image charge on target 33while it is being scanned. Immediately after the scanning of 0 any line, the light filter associated with such line is changed and the new filter remains associated with such line until just before the time when the line is next scanned by the beam. At this time, the light path corresponding to such line is again blocked by one of the spacing members 55 as described. The effective spacing member 55 at the right-hand side of drum 54 which blocks the successive portions of the light path corresponding to the lines of a particular field being scanned thus moves down the image on photocathode 43 as the image charge on target 33 is scanned. However, the effective spacing member 55 at the left-hand side of the drum moves up across corresponding portions of the image, inasmuch as the images formed at apertures on the left-hand and right-hand portions of the drum by the image inverting means," positioned within the drum are inverted with respect to each other. Thus, by the provision of the drum 54, there has been provided an arrangement for inserting the color filters in a color television system in such manner that light of a given color is associated with a given line during substantially the entire field-scanning interval until just before the line is to be scanned at which time all light is blocked from the portion of the photocathode corresponding to such line. Immediately after scanning of such line, a color filter of different color is inserted in the image path corresponding to this line and such color filter is maintained in the path until just before the line is next scanned, at which time the line is again blocked as described. It will be apparent that the tube 32 may be placed within the drum, in which case the image-inverting lens 53 can be dispensed with and that either arrangement is eifective to change the color filters in a manner such that the lines of color demarcation between color filters are at all times parallel to the scanning lines.

A signal output of interlaced type is developed by signal-generating tube l0 due to the action of disc 56 which is driven at half the field-scanning frequency. Thus, if the sector 58 of disc 56 is effective in the system during an interval when red color filters are inserted in the light path, it may be assumed that the light travels directly through the system without being affected or displaced vertically by the sector 58. This is, of course, true if the sector 58 has the same refractive index as that of air or if, as described above, the sector 58 is completely omitted from the disc 56. However, by establishing the proper phase relation of disc 56 to the field-scanning operation, assoon as a given line is scanned, for example, line I, the refractive index of the light path corresponding to this line is changed by the insertion of the sector 59 of the disc 56 into the light path. The refractive index of the sector 59 is so chosen that the image is displaced one-half line either upwards or downwards on the photocathode 43 so that when line I is scanned during the next field, the signal therefrom corresponds to a portion of the image 50 displaced one-half line from that utilized to generate a signal during the previous scanning of line I. In this way, a video-frequency output is developed from unit I 0 which is effectively a doubleinterlaced video-frequency signal.

The greatest advantage of the interlacing system of the invention is obtained in a color television system for the reason that when any line of target 33 is scanned, the image charge thereon is completely discharged and immediately thereafter a different color filter is inserted in the light path corresponding to this line. Also, at the same time, the image corresponding to. this line is displaced one-half of the distance between the lines so that, at the time of next scanning this line, the only image charge associated therewith is that due to light of a color desired to be effective at that time and that due to the particular field of the image to be transmitted. Since the color of light associated with each line is changed immediately after the scanning of the line and since the image associated with each line is displaced at the same time, it may be seen that the blocking means 55, which blocks the image to each line during the interval it is being scanned, effectively biocxs the image to each line when changing the color of light and displacing the image associated with each line.

The receiver of the system of Fig, 1 includes an antenna system 20, 2| connected to a radiofrequency amplifier 22, to which is coupled in cascade, in the order named, an oscillator-modulator 23, an intermediate-frequency amplifier 24 of one or more stages, a detector 25, a video-frequency amplifier 26 of one or more'stages, and an image-reproducing device 21 constructed in accordance with features of the present invention and hereinafter described in detail. A linescanning circuit 28 and a field-scanning circuit 29 are coupled to the output circuit of the detector 25 through a synchronizing-signal separator 30 and to scanning control elements of image-reproducing device 21.

The stages or units 20-26, inclusive, and 28-30, inclusive, may all be of conventional well-known construction, so that detailed illustration and description thereof are unnecessary therein. Referring briefly, however, to the operation of the receiver as a whole,-television signals intercepted by the receiver antenna circuit 20, 2| are selected and amplified in radio-frequency amplifier 22 and applied to the oscillatormodulator 23, wherein they are converted into intermediate-frequency signals which, in turn, are selectively amplified in the intermediate-frequency amplifier 24 and delivered to the detector 25. The modulation components of the signal are derived by the detector 25 and are supplied to the video-frequency amplifier 26 wherein they are amplified and from which they are supplied in the usual manner to a brilliancy-control electrode of the image-reproducing device 21. The intensity of the scanning ray of device 21 is thus modulated or controlled in accordance with the video-frequency voltages impressed upon the control electrode in the usual manner. Scanning waves are generated in the line-scanning and field-scanning circuits 28 and 29 and are supplied with synchronizing pulses from detector 25 through synchronizing-signal separator 30 and the outputs of the scanning circuits are applied to the scanning elements of the image-reproducing device 21 to produce electro-scanning fields, thereby to deflect the scanning ray in two directions normal to each other so as to trace a rectilinear scanning pattern on the screen and thereby construct the transmitted image.

The image-reproducing unit 21 is constructed in accordance with the invention and includes a cathode-ray tube 60 of conventional design including a cathode i, a control electrode 62, first and second accelerating electrodes 63 and 64, a collector electrode 55, and a fluorescent target 66 on the end wall of the tube. Line-scanning coils 68. G9 and field-scanning coils 10, 1| are provided for the vacuum tube 50. Suitable operating potentials are applied to the various electrodes of the tube, for example, by means of batteries 12 and 13. The image-reproducing unit 21 also comprises a number of elements which correspond in type to those of signal-generating unit in of the transmitter section of the system and such elements have reference numerals identical to those of corresponding elements of the transmitter with the addition of a prime. The lens SI of image-reproducing unit 21 serves to focus the reproduced image on a screen 14 in order that the image can be viewed by an observer.

In order to drive the drum 54 synchronously with the corresponding elements 54 and 56 at the transmitter, there is provided a motor 15 connected by dotted lines to drum 54'. However, it will be understood that the driving motors are synchronized in one of the various manners well understood in the art, this being accomplished in the embodiment illustrated by driving the motors from a common power source although synchronizing signals for the motors can also be provided between the transmitter and receiver.

The refracting disc 56 has been omitted from the image-reproducing unit 21, it being understood that target 66 is scanned in a manner which is conventional in double-interlaced scanning systems; that is, the odd lines are scanned during one field period and the even lines are scanned during the succeeding field period. The opera tion of the color-filter-carrying drum 54' is generally the same as that of drum 54 and it is believed that a further description of the operation of the receiver is unnecessary herein.

It will be understood that interlaced scanning of the target of cathode-ray tube 60 is not essential and that this tube can be scanned in exactly the same manner that target 33 of tube 32 of signal-generating unit i0 is scanned, that is, in a series of similar fields of spaced parallel lines, provided that a disc corresponding to 56 of signalgenerating unit ii! is included in the optical path in order to provide the equivalent of a doubleinterlaced picture on the screen 14.

While color filters of three different colors have been illustrated as being used in the drum 54, it will be understood that the invention is not limited toa color television system of any specific number of colors or fields. However, by the use of frames of two fields and three colors, applicant also provides the advantages of a system of the type described and claimed in his copending application, Serial No. 355,547, filed September 6, 1940.

Furthermore, it will be understood that other structures which are the full equivalent of either of drums 54 and 54 can be used in practicing the invention. For example, in place of the color filters being mounted on a rigid drum they can be comprised in an endless belt and it is intended that the word drum be interpreted to cover such equivalent structures.

While there has been described what is at present considered to be the preferred embodiment of this invention, it will be obvious to those skilled in the art that various changes and modifications may be made therein without departing from the invention, and it is, therefore, aimed in the appended claims to cover all such changes and modifications as fall within the true spirit and scope of the invention.

What is claimed is:

1. A color television signal-translating system comprising, a cathode-ray tube including a target, means for successively scanning said target with an electron beam in a series of similar fields of spaced parallel lines, optical means associated with said target for forming an image of the translated television picture, means for changing the color of light associated with each line a given interval after such line is scanned and for maintaining said color associated with said line until said line is next scanned by said beam, means included in said optical means for effectively displacing the image associated with each line with respect to said scanning lines a given interval after said line is scanned and for maintaining said image displaced until said line is next scanned by said beam, thereby effectively to provide interlacing of the scanning lines of the translated image, and means for blocking the image to each line when changing the color of light and displacing the image associated with each line.

2. A television signal-transmitting system, comprising a cathode-ray tube including a target electrode, means for successively scanning said target electrode with an electron beam in a series of similar fields of spaced parallel lines, optical means associated with said target electrode for forming thereon an image of the translated television picture, means included in said optical means for effectively displacing the image associated with each line with respect to said scanning lines a given interval after said line is scanned and for maintaining said image displaced until said line is next scanned by said beam, thereby effectively to provide interlacing of the scanning lines of the translated image, and means for deriving a television signal from said target electrode.

3. A television signal-transmitting system, comprising, a cathode-ray tube including a target electrode, means for successively scanning said target electrode with an electron beam in a series of similar fields of spaced parallel lines, optical means associated with said target electrode for forming thereon an electron image of the translated television picture, means included I in said optical means for effectively displacing the image associated with each line with respect to said scanning lines a given interval after said line is scanned and for maintaining said mage displaced until said line is next scanned by said beam, thereby effectively to provide interlacing .of the scanning lines of the translated image,

and means for deriving a television signal from said target electrode.

4. A television signal-transmitting system, comprising a cathode-ray tube including a target electrode and a photocathode, means for successively scanning said target electrode with an electron beam in a series of similar fields of spaced parallel lines, optical means for forming an electron image of the translated television picture on said photocathode, means for deriving an electron'image from said photocathode and focusing it on said target, and means included in said optical means for effectively displacing the image associated with each line with respect to said scanning lines a given interval after said line is scanned and for maintaining said image displaced until said line is next scanned by said beam, thereby effectively to provide interlacing of the scanning lines of the translated image.

5. A television signal-translatin system comprising, a cathode-ray tube including a target, means for successively scanning said target with an electron beam in a series of similar fields of spaced parallel lines, optical means associated with said target for forming an image of the translated television picture, and means included in said optical means for eiiectively displacing the image associated with each line with respect to said scanning lines a given interval after said line is scanned and for maintaining said image displaced until said line is next scanned by said beam, thereby effectively to provide interlacing of the scanning lines of the translated image.

6. A television signal-translating system comprising a cathode-ray tube includin a target, means for successively scanning said target with an electron beam in a series of similar fields of spaced parallel lines, optical means associated translated television picture, means for blocking the image of each line during the interval said line is being scanned, and means included in said optical means for effectively displacing the image associated with each line with respect to said scanning lines a given interval after said line is scanned and for maintaining said image displaced until said line is next scanned by said beam, thereby effectively to provide interlacing of the scanning lines of the translated image.

7. A television signal-translating system comprising, a cathode-ray tube including a target, means for successively scanning said target with an electron beam in a series of similar fields of spaced parallel lines, optical means associated with said target for forming an image of the translated television picture, and light-refracting means in said optical means for effectively displacing the image associated with each line with respect to said scanning lines a given interval after said line is scanned and for maintaining said image displaced until said line is next scanned by said beam, thereby effectively to provide interlacing of the scanning lines of the translated image.

8. A television signal-translating system comprising, a cathode-ray tube including a target, means for successively scanning said target with an electron beam in a series of similar fields of spaced parallel lines, optical means associated with said target for forming an image of the translated television picture, and means effectively comprising a disc having radial sectors of different refractive indices and moving in a plane inclined with respect to the optical axis of said optical means for effectively displacing the image asso'ciated with each line with respect to said scanning lines a given interval after said Line is scanned and for maintainin said image displaced until said line is next scanned by said beam, thereby effectively to provide interlacing of the scanning lines of the translated picture.

9. A television signal-translating system comprising, a cathode-ray tube including a target, means for successively scanning said target with an electron beam in a series of similar fields of spaced parallel lines, optical means associated with said target for forming an image of the translated television picture, and a disc effectively having sectors of different refractive indices and rotating in a plane inclined with respect to the optical axis of said optical means for effectively displacing the image associated with each line with respect to said scanning lines a given interval after said line is scanned and for maintaining said image displaced until said line is next scanned by said beam, thereby effectively to provide interlacing of the scanning lines of the translated image.

10. A color television signal-translating system comprising, a cathode-ray tube including a target, means for successively scanning said target with an electron beam in a series of parallel lines, a drum having a plurality of similarly shaped apertures on the periphery thereof, said drum being interposed in the optical path between said target and the television image to be translated, color filters in predetermined ones of said apertures, optical image-inverting means within said drum for forming corresponding inverted images of the translated picture substantially at two of said apertures, and means including means for rotating said drum for changing the color of light associated with each line a predetermined with said target for forming an image of the interval after such line is scanned and (or maincolor filters oi the same type, and means includtaining said color associated with said line until ing means for rotating said drum for changing said line is next scanned by said beam, the color of light associated with each line a pre- 11. A color television signal-translating system determined interval after such line is scanned comprising,acathode-ray tube including atarget, and for maintaining s'aid color associated with means for successively scanning said target with said line until said line is next scanned by said an electron beam in a series oi! parallel lines,colorbeam. filter-carrying means interposed in the optical 13. A color television signal-translating syspath between said target and the television image tem comprising; a cathode-ray tube including a to be translated, means for moving said filter- 10 target, means for successively scanning said target carrying means so that the lines of color demarcawith an electron beam in a series of parallel lines, tion thereof remain substantially parallel to said a drum having a plurality of similarly shaped lines or said series for changing the color of light apertures on the periphery thereoi, said drum beassociated with each line a predetermined interval ing interposed in the optical path between said after such line is scanned and for maintaining target and the television image to be translated, said color associated with said line until said line color filters 1n predetermined ones oi! said aperis next scanned by said beam, and means for tures, optical image-inverting means within said blocking the image of each line during the indrum for iorming corresponding inverted images terval said line is being scanned. oi the translated picture substantially at two of 12. A color television signal-translating sys- -20 said apertures, means including means for rotem comprising, a cathode-ray tube including tating said drum for changing thecolor of light a target, means for effectively scanning said tarassociated with each line a predetermined interget with an electron beam in a series of parallel val after such line is scanned and for maintainlines,a drum having a plurality of similarly shaped ing said color associated with said line until said color filters on the periphery thereof, said drum line is next scanned by said beam. and means inbeing interposed in the optical path between said cluding a spacing means between said color filters target and the television image to be translated, for blocking the image of each line during the optical image-inverting means within said drum interval said line is being scanned.

for forming corresponding inverted images 01 the translated picture substantially at two 01 said 30 JOHN C. WILSON.

DISCLAIMER 2,295,443.-John O. Wilson, Bayside, N. Y. Tmmvxsmn SIGNAL -TRANSLATING SYSTEM. Patent dated Sept. 8, 1942. Disclaimer filed March 27, 1947,

by Charles E. Dean, administrator of John O. Wilson, deceased, the assignee, Hazeltine Research, 1110., assenting.

Hereby enters this disclaimer to claims 1, 2, 3, 5, 6, 7, 8, and 9 of said patent.

[Ofiim'al Gazette April 29, 1947.]

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