US2416918A - Color television system - Google Patents

Color television system Download PDF

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Publication number
US2416918A
US2416918A US512119A US51211943A US2416918A US 2416918 A US2416918 A US 2416918A US 512119 A US512119 A US 512119A US 51211943 A US51211943 A US 51211943A US 2416918 A US2416918 A US 2416918A
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color
filter
light
image
component
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US512119A
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Alfred N Goldsmith
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RCA Corp
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RCA Corp
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Priority to FR955405D priority Critical patent/FR955405A/fr
Priority to NL73157D priority patent/NL73157C/xx
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Priority to US512119A priority patent/US2416918A/en
Priority to GB20745/45A priority patent/GB599134A/en
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B33/00—Colour photography, other than mere exposure or projection of a colour film
    • G03B33/10—Simultaneous recording or projection
    • G03B33/16—Simultaneous recording or projection using colour-pattern screens
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/10—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from different wavelengths
    • H04N23/12—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from different wavelengths with one sensor only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/03—Circuitry for demodulating colour component signals modulated spatially by colour striped filters by frequency separation

Definitions

  • This invention is directed to television systems; and particularly is concerned with methods and systems for individually controlling the current balance or primary color gain for either the socalled cyclic or sequential color television 'systems on the one hand, or for simultaneous color television systems on the other hand. Also, the invention is directed, with equal applicability, to cyclic or simultaneous color photography.
  • a system of color balance control which is primarily optical in its nature and which involves a specialized and appropriate type of color iilter irig instrumentality which will be suitably assoelated with the objective lens system of the television camera tube together with suitableA and requisite means for providing either local or remote control of the illters or filtering aggregate relative to the optical system.
  • a system of this nature is free from many of the inherent diillculties of a system which is purely electrical in its nature and from one wherein the individual primary color video amplifier channels are adjusted to a variable degree of gain to secure the desired color balance irrespective of all variations which can be introduced from electrical noises, changes in illumination with change in the illuminant color temperature, changes in circuit power supplies or operation, and other variations of various characters.
  • therelis a certain limited range of color which is not correctly reproducible by any presently known additive color system of usual design, such as those colors which lie outside the triangle formed between the three points defining the primaries used in the system 'and shown by the usual-red and green chromoticity diagram.
  • any other colors within rect color balance of the image transmission is most conveniently accomplished with the aid of visual observation on a monitoring assembly, with the skilled observer or monitor adjusting the relative intensities of the transmitted primary or component color images until the desired color balance effect is achieved.
  • this process of monitoring becomes somewhat analogous to the process of monitoring a sound broadcasting program on a monitoring loudspeaker.
  • the present invention incorporates only optical instrumentalities, except for the controls thereof which are to be effective to make adjustments in" the'color balance set-up.
  • Such optical adjustments provide, according to the present invention, for the positioning of one or more suitable filter elements, which will herein be termed a diversified color fllter, in such aA position relative to the television camera that the objective of the lens system of the camera is incapable of forming any image of the objects lying in the filter plane upon the light sensitive camera tube or mosaic.
  • the invention is so contemplated that provision is Amade for locating the diversified color lter system in such relationship to the light rays of the image which is to be cast upon the light sensitive camera tube that light rays from each point of the object must pass through every point of the diversified color filter system on their way to the image forming target or screen or mosaic of the camera tube.
  • the present invention contemplates the use of suitable diversified color filter systems as have a filter area suiliciently great orthogonally to the image forming light beam to permit the entire beam to pass through the filter, irrespective of any necessary and desired range of adjustment of the position of the lter, and, further, that the diversied color lter shall be located near, or actually in, the lens system which directs the light of the image upon the camera tube of the television system and at a distance from the nearest nodal point of the lens system which is small with the comparison of the corresponding distance therefrom ofthe object or image respectively.
  • the system contemplates the utilization of suitable diversified color filter devices in combination with image scanning or camera apparatus, with provision being made, as before stated, to locate the planar diversied color filter in such a position relative to the 'scanning instrumentalities that the entire light beam passes through the lter and yet the filter is so placed that it is not imaged upon the camera tube target or mosaic plane.
  • Color photographic systems. of either the cyclic or the sequential type embody, generally speaking, the same general forms of arrangements as the broadly related television systems.
  • the general arrangement of the diversified color lter and the color selective disc is substantially similar to that of the sequential or cyclic television systems, insofar ⁇ as the arrangement of each of the diversified color filters and the color selection discs, relative to the optical system and the light responsive target or film surface, are concerned.
  • Special provisions are made for monitoring which are slight departures from the de vices normally used in conlleftioli With 4 television systems, in that, for any photographic system, visual monitoring devices are desirable.
  • Simultaneous color photography systems also may be provided with the diversified color filter arrangements in the same general manner as for television systems.
  • use may be made of well known tricolor or bicolor or multicolor separation cam ⁇ eras, or the color separation may take place by virtue of the type of film used for recording.
  • the simultaneous color photographic process is generally similar to the simultaneous color tele--A vision process, except again as to the monitoring system.
  • the color separation disc is usually not required in simultaneous systems.
  • Stationary separation lters are also usable in the color photographic process and these may be physically presenter they may be present, for instance, in effect, though usually to a limited extent only, by the color sensitization of the emulsion layers or components. In what is to follow, further reference will be made to the monitoring features.l
  • a filter of this character will be defined as one wherein the filter area includes areas of more than one and the same color and where, accordingly, the complete illter eiect results from the composite or conjoint effects of the color filtering of all of the filter areas of diierent colors.
  • a further object of the invention is that of producing an optical mechanical method of obtaining the requisite color balance as well as, in many instances, an optical electrical control and method for achieving such color balance with the actual color balancing effect resulting from purely optical adjustments.
  • a further object of this invention is that of avoiding added electro-mechanical or electrical commutating equipment as a portion of the usual color television system where adequate adjustments have been made for achieving a color balancing throughout the range of transmission.
  • a further object of the invention is that of providing optical equipment by which color balancing effects are achieved and which equipment can readily vbe controlled and operated from a remote source to achieve instantly an adjustmentV of color balance to modify transmission effects.
  • a further object of the invention is that of providing a diversified color filter assembly which may be positioned relative to the television camera tube and its optical system in the manner above and blue-are usually selected in television operations for convenience. It will be understood and appreciated. however, that some variance in the selection of these colors is possible since the colors selected, generally speaking, may be any three colors which are so chosen that no one of them can be reproduced by the other two alone. Accordingly, it is possible to choose as to the primary or component colors any three colors, preferably widely spectrally separated, which would vbe represented by any three points in the I. C. I.
  • a further object of the invention is that of providing a color balancing diversified color filter capable of use in combination with suitable infra-red filters in the path of the image forming beam and as a fixed adjunct in connection therewith, so that the infra-red forming beam will prevent false color effects which vfrequently result from the sensitiveness of the usual camera tube mosaic of the Iconoscope or Orthicon type to infra-red light, picture haze, or even possibly, lack of' sharpness of focus of the resulting optical image directed thereupon.
  • Another object of this invention is that of providing a system of color balance control which is generally applicable to use in both television and photographic arrangements and usable in these arrangements whether or not the process is carried forward in either a sequential or simultaneous manner.
  • Fig. 1 shows schematically one arrangement of the system to illustrate the general relationship between the scanning or camera tube and the color filter disc and the diversified color filter;
  • Fig. 2a illustrates one arrangement of the diversified color filter relative to the optical system of Fig. 1;
  • Fig. 2b illustrates a modification of Fig. 2a
  • Fig. 2c illustrates a further modification of Fig. 2a
  • Fig. 3 is a schematic representation of the general arrangement of the diversified color filter through Fig. 10 looking in the direction of the Y arrows; r
  • Fig. 12 represents, in conventional schematic manner, one suitable form of electrical circuit for controlling the filter adjusting apparatus from a remote point;
  • Fig. 13 is a conventional representation of one suitable form of diversified color filter adjustment particularly suited to the adjustment of' filters of the type shown by all of Figs. 4 through '7 relative to the camera tube and the optical system thereof;
  • Fig. 14 is a section through Fig. 13 along the line I4-I4 thereof looking in the direction of the arrows;
  • Fig. 15 is a schematic representation of one suitable form of control for providing adjustment of the diversified color filters of the types shown by Figs. 8 and 9 relative to the scanning or camera tube and its optical system.
  • the light of an image II is directed through an optical system I3 of any conventional character to reach the light sensitive plate or mosaic target I5 of a television camera tube Il.
  • the television camera tube may be of any known character such, for example, as those tubes known in the art as the Iconoscopes or Orthicons, or the tube, on the other hand, may be of the non-storage type such as that, for example, which is known in the art as the Dissector tube. In a three-color sequential type system.
  • the light thus directed upon the mosaic or target electrode IB of the camera tube I1 is passed through a light or color filter disc I 9 which is appropriately rotated on a shaft 2i by means of a suitable drive motor 23 which rotates at any desired speed such that the driven disc rotation is appropriately related to a desired field frequency of image transmission.
  • the filter disc I9 is usually divided into three equal-area components or sectors so as to pass or transmit light of chosen component or primary colors, such as the red, the green. and the blue. and thus, as the disc I9 is rotated, the light of the image is directed to the camera tube mosaic through successively changing different color areas to produce the three component color transmissions in sequence.
  • the rotary color component disc I9 is placed in conventional relationship to the optical system I3 and the camera tube I1 and/or its mosaic or light responsive target electrode I5, as is well known fields, which are conventionally represented as being produced by the defiecting coils 29, although it is to be understood that electrostatic deflection may be used as an alternative, or that the deflection may be under the control of a combination of electrostatic and electromagnetic means.
  • the video signals from the camera tube mosaic I which result from scanning it in known manner are then applied according to Well known means to a video amplifier 3
  • is then fed to an output or load circuit 33 to be transferred to further amplifiers, modulators and transmitters, and then to be distributed to suitable receiving points Via Wire line or radio link communication channels or by combinations of such channels.
  • a filter assembly 3 5 which is herein to be termed, for reference purposes, a diversified color filter.
  • this filter is located near or approximately adjacent the lens system, and at a distance from the nodal point of the lens system which is small in comparison with the distance therefrom of the object I I or the image thereof which is cast upon the mosaic I5 depending upon whether the lter 35 is on the object side or the image side of the lens respectively.
  • a monitoring system is conventionally represented at 24, and this monitoring system then receives output signal energy from the video amplifier 3
  • the monitoring system will comprise suitable image reproducing tubes of the cathode ray type for instance, as well as a suitable filter disc assembly, forming a counterpart of the disc I9, which monitor disc, although not shown, will be understood to operate synchronously and cophasally with the disc I9 and preferably may be driven with a synchronous motor operating from the same power supply line as the motor 23.
  • the operator at the monitoring system may adjust various color control elements 26, 28 and 30 which are schematically illustrated, and which may then serve in appropriate manner to supply the controlling effects via the filter control cable 31 to adjust the diversified color filter assembly 35 relative to the optical system I3 and the camera tube Il, and, more specifically, relative to the optical axis of the lens I3.
  • control cables may be of various types and any mechanical or electrical control may be used, generally speaking, for the purpose.
  • the main result to be accomplished by the control cable conventionally represented at 31 is that of providing control forces whichare sufficiently powerful and free from back lash to carry out the control promptly -with action sutliciently accurate so that motions of the controlling instrumentalities are capable of positioning the diversified color filter in any desired arrangement.
  • various means may be utilized, among which may be included controlled Selsyn or Autosyn motors, controlled torque-transfer cables and the like, which are caused to drive or rotate various mechanical means serving to move and position the filters relative to the 0ptical system and the camera tube.
  • the image II is positioned along the optical axis 39, 4U of the schematically represented objective or lens system I3. Accordingly, it can be appreciated that the image of the object II will be formed in inverted manner between points 4I and 42 on the surface I5, which is assumed, for reference purposes, to be the camera tube mosaic.
  • the relative dimensions of the object and image respectively may differ widely from those shown in Fig. 3 which is to be regarded as illustrative. Considering this arrangement, light from the point 43 of the object or subject II will form rays conventionally represented at 45, 41 and 49 which, in their totality, strike all points of the anterior surface of the optical system I3.
  • the diversified color filter element 35 must pass the entire light bundle from each point of the object, insofar as such bundle passes through the lens or objective I3, and is effective in the formation of the final image on the mosaic or target electrode I5. Furthermore, the diversified color filter 35 must also be placed in such a location relative to the lens system or objective I3 that it cannot be, or is not focused thereby upon the image plane or mosaic surface I5.
  • FIG. 2 various com- 9 binations of a group of aiternativelyacceptable diversified color filter positions are shown;
  • the optical system is composed of schematically represented compo- 'nents 5
  • the diversified color filter 35 is placed close to the anterior surface of the lens. As shown by Fig. 2c, the color filter 35 may be placed, with equal eectiveness, close to the posterior surface of the lens. In the arrangement of Fig. 2b, the diversified color filter 35 is placed intermediate the' components 5
  • the arrangement of Fig. 2c, as above depicted, is that vwhich corresponds to -the illustrated modification in the schematic representation of Fig. 1.
  • the light may be directed to suitable independent scanning or camera tubes for the scanning of the independent component or primary color images.
  • the light of the image is passed through or reflected from suitable halfsilvered mirror surfaces, for instance, to be directed upon independent scanningy or camera tubes through suitablyv positioned fixed filters of the selected primary or component colors, so that an image of a like size and aspect ratio is directed upon each of the independent scanning or camera tubes.
  • the scanning pattern and scanning detail in each tube is carried on simultaneously and. in identical manner through lthe use of a plurality of separate tubes toreproduce the desired color ⁇ image signals for transmission.
  • the images are reproduced at receiving points in known manner through the use of a plurality ofseparate tubes lWhose images are brought into registry on a viewing screen, or
  • the light path may be as above explained and the separate images, representing the chosen component colors,.may then be directed along independent channels, as exemplified, for instance, by the Hefele Patent No. 2,037,166, granted April 14, 1936, with it being understood, of course, that the diversified color filter herein disclosed makes unnecessaryA the adjustment of the amplification level in the diierent signalling channels to compensate for any differences in response of the .system due to different sensi,.- tivities of different light responsiveelements to different colors, for in applicants present disclosure the compensation is taken care of optically and without introducing electrical noise or other disturbances into the outgoing signal by is intended to .include any .form of composite color filter which, through alteration of its position in relation to the center of the image form-- ing light beam, and therefore with reference to the boundary vof the active image forming portion thereof, acts effectively as a variable color filter to enable the desired color balancing effect to be achieved.
  • the diversified color filter 35 consists of three separate areas, conventionally desig.. nated at V55, 51 and ⁇ 59 and also shown, for example, by the letters R, G and B respectively, which are intended to represent the component or primary colors, red, green and blue, selected for the transmission.
  • the sections 55, 51 and 59 of the diversified color filter 35 are respectiveLv a rather pale blue, a rather pale red and :a pale green which," for illustrative purposes,
  • the light absorption from the three areas 55, 5l and 59 should preferably be equal to their effect on the resulting brightness on the transmittedimage, so that changes in color balancing
  • the three separate filter sections forming the red section 55, the green section 51 and the blue section 59 function as light absorbing color filters and are used primarily for color balancing under practical conditions of normal variations from balance which can be obtained, for instance, by adjustment of the filter, so that the color balance is maintained at a moderate value.
  • the filter light absorptions can be maintained at quite moderate values and, for instance, within the range of about to 20% light absorption.
  • the filter light absorptions can be maintained at quite moderate values and, for instance, within the range of about to 20% light absorption.
  • the diversified color filter assembly is moved up or down, as indicated by the arrows adjacent to the side of Fig. 4, the color corrective or balancing effect will be toward the red or the green respectively.
  • any desired change in the chromaticlty of the light reaching the camera tube through the diversified color filter 35 can be secured if it lies within the range of colors obtainable by a balancing lter 35 which has a specific saturation or primary color absorption for each of its color areas.
  • the red, the green, and the blue areas 55, 51 and 58 are all of substantially uniform saturation or light absorption over their entire areas, so that a lateral or horizontal motion of the filter to the left will bring more blue before the camera tube mosaic, or to the right will bring more of the red and the green and less of the blue before the camera tube mosaic.
  • a downward motion of the lter 35 will bring more oi the red and less of the green and an equal amount of blue before the camera tube mosaic', while an upward motion of the lter 35 will bring more of the green and less of the red, and yet retain an equal amount of the blue before the camera tube mosaic.
  • Combinations of horizontal and vertical motions will provide for further variations of these adjustments.
  • the areas 53, 55 and 51 of the lter which are assumed to be the red, the green, and the blue illter areas respectively, are formed according to the same shape or configuration as those assumed for Fig. 4, but are representative of the nature of color wedges, that is, the color becomes increasingly intense toward the outer edges so that there is increased absorption or saturation in the fashion indicated by the drawings, where the lightest area of the filters is over the areas of lightest shading in the figure.
  • color wedges are readily made by well known methods using, for example, dyed gelatine flowed between two pieces of glass or other transparent material which forms an air wedge between their mutually inclined surfaces.
  • the diversified color filter 35 is assumed to be formed from the red, the green, and the blue color filter areas 63', 65 and 61 which are similar to those of Fig. 5.
  • These areas 63', 65' and 61' of Fig. 6 will also be in the nature of color wedges, but are formed in a slightly modified fashion which is indicated in such a way that the greatest absorption of light occurs at the remote corners of the red and the 'green filter areas 53 and 65 respectively, while the maximum absorption of the blue fllter section 61' corresponds substantially to that represented for the filter area 51 of Fig. 5.
  • the adjustment of the filter in the horizontal plane and in the vertical plane may be made as already explained in connection with Fig. 4, and, accordingly. is here represented again merely by the vertical and horizontal areas extending in both the up and down and the right and left directions.
  • the diversified color filter element shown by Fig. 7 is, in many respects, somewhat similar to that filter assembly shown by Fig. 4, for instance, except that the filter of Fig. 7 comprises four distinct areas 55', 51', 59' and 59.
  • the tllter areas 55' and 51' correspond respectively to the areas 55 and 51 comprising the red and green sections of the filter of Fig. 4.
  • the area. identified as 59 serves as the blue lter area and corresponds to the arrangement of Fig, 4. except for the size of the blue filter area.
  • the remaining filter area 59 also marked by the letter K on the representation of Fig.
  • lter areas serve substantially to produce what is known in the art as a key image, in combination with tricolor systems, where the key image is also transmitted so that it later may be reproduced in a natural tint, such, for example, as black, grey, and white, and byadjustment of the filter assembly 35 of Fig. 7 in the direction shown by the arrow.
  • a natural tint such as black, grey, and white
  • the key image serves more or less as a black-and-whlte delineator and improves the transmission as a whole. More particular reference was made to the key image and its use in connection with additive color systems in applicant's presently pending application, Serial No. 455,556, filed August 21, 1942, and hereinabove previously mentioned.
  • the color filter areas may be formed as sectors of circular filter elements, conventionally represented at 15 particularly in the showings of Figs. 8 and 9.
  • the various flltersfor providing the red, the green, andthe blue transmissions are shown as sector shaped areas l120 in extent, but, for purposes of practical operation, they may be of any such angular width as is particularly suited to the color intensity absorption or saturation and other factors of the individual colors of the sectors.
  • the color saturation of the various filter areas such as 19 and 8
  • Fig. 8 The lter arrangement of Fig. 8, for example, is somewhat closely related to that of Fig. 5, in that the more dense areas are at the boundaries.
  • the filter arrangement of Fig. l9 is, however, somewhat different from all the preceding types in that Fig. 9 discloses the most dense area at the central portion of the filter.
  • Motion of the filters in three directions, to provide the desired combination of filter effects in the optical path to the camera tube may be provided, as indicated in Fig. 8, along paths desigl nated by the arrows 83, 85 and 81, while with the modification of Fig. 9, where the most dense section of the filter is toward the center, suitable adjustment of the filter is preferably obtained by moving up and down in the vertical direction, asl shown by the arrows 89, and by providing rotary motion about an axis 9
  • might serve as an adjustment means whereby the diversified color filter position relative to the camera tube and the optical system is changed. This is particularly desirable in connection with arrangements whereby color balancing at the camera is Icarried forward fromv a remote control point, such as the monitor booth, whereat the observer or control operator views the images of the subject being transmitted.
  • any form of mechanical or electrical controlmethod may be used for the purpose of providing the necessary or desirable adjustments of the diversified color illter 35, provided that the control force which may be applied'through the control shall be sufllciently powerful toA carry out the control those represented conventionally at 2l. II and 30 in Fig. 1, shall be precisely conveyed to the controlling devices for actuating or moving or adjusting the diversied color filter.
  • Fig. 10 Represented by Fig. 10 is a torque-transfer cable of the triple type.
  • This lcable is provided with three separate sections capable of transferring motion to three separate controls.v
  • is arranged in such a manner as to be capable of rotation under the control of a control knob
  • 05 may be assumed to be caused to rotate under the control of the control knob I 01, which is provided with a hollow centralmost opening ⁇
  • 05 is separated from the innermost section by a stationary low friction cylindrical member which serves as both a. bearing surface and a support for the cable elements or sections
  • the outer s'ection 3 of the torque-transfer cable element is arranged also in the form of a cylinder which is supported from the bearing surface
  • 3 is arranged to be rotated relative to the stationary bearing surface
  • the outer covering of the cable is provided by the outer shell
  • 05 may be rotated under the control of the control knob 28 of Fig. 1, and that the hollow 'cylindrical torqueftransfer section
  • 3 may be rotated under the control of the control promptly, and that the action transferred shall be sufliciently accurate or free from back lash that motion of control knobs or the like, such as
  • the showings of Figs. 10 and 11 are consideredV to be purely schematic and to function in co' operation with the remaining figures of the drawings, and are particularly to exemplify the control between the monitor system 24 of Fig. l-
  • control means 26, 26 and 30 may be arranged to operate or actuate suitable Selsyn or Autosyn motors for the purpose of providing the bi-directional motion or rotary motion of the light filter sections, as herein to be described.
  • control currents may be used for control purposes in various well known manners.
  • 21 are assumed to be the usual telephone line circuits which carry the sound portion of the program from the pickup point to the transmitter.
  • the diversified color filter element 35 which has been assumed to be a filter 'of the type schematically represented by Fig. 1, for instance, 'is carried in a support element
  • 39 which carries the diversified color filter element 35 is provided in one conventional form by means of the pinion
  • the 10 and 11 may be so arranged as to provide so that one section of the torquetransfer cable is arranged to rotate in either a clockwise or a counter-clockwise direction on the pinion
  • 39 is moved by virtue of the rotation of the pinion
  • is arranged to be carried in guideways
  • 53 may be considered as being driven and rotated in either the clockwise or counter-clockwise direction under the control of another or second section of the torque-transfer' cable 31 of Fig. 1 and more particularly explained by Figs. 10 and 11; Accordingly, with the optical system so arranged relative to the supported diversified color ilter section, it is apparent that a rotation of the pinion
  • the correct filtering of the red and the green components may be obtained under such conditions, so that the red and the green sections 55 and 51 of the diversified color filter 35 may be varied and more or less of them placed in the optical path by a rotation of the pinion
  • which is particularly adaptable for use with thefllter section shown by Fig. 8, is schematically shown.
  • independent drive pinions for obtaining motion of thefllter in the directions represented by the arrows 83, 85 and 81 are provided respectively by means of driving pinions
  • is provided with a window or apertured portion defined by the dotted outline
  • the lowermost adjustable support element is provided with a window or apertured area defined by the dotted outline window portion
  • the adjustment of the diversied color filter, relative to the camera or scanning tube I1 is established Awithout the necessity of continually shifting from one position to another, since the adjustment, once established, has been found to be such that it will hold for a considerable time with variations required only upon substantial changes in the studio or circuit conditions taking place, all as hereinabove outlined.
  • the cyclic color photography processes are carried forward .in broadly the same way as for cyclic or sequential television, with the exception that monitoring must be carried forward by a modified form of arrangement since the recorded image is latent and unavailable until after development, which requires an appreciable time.
  • the process is generally similar to that of simultaneous color television, with the exception that the recording, in its final form, in each photographic instance, takes place directly upon the lm as a latent image later to be developed, and consequently unavailable for examination at the time of exposure.
  • a diversied color filter is positioned in both the optical path along which the light'of the image is directed through the camera lens to the film, and also along the optical path through the view finder lens to the view finder image plane.
  • the separate diversied color filters in such systems should be mechanically coupled and in the same relative location with respect to each optical system.
  • the diversified color fllter, located in the main or primary voptical system may be considered as being equivalent to the filter shown by any of Figs. 4 through 9 and located relative to the optical system i3 in the general arrangement shown by Fig. 1.
  • the operator viewing the image in the view finder will control the position of the knobs or dials 2B, 28 and 30, for instance, in the same manner as with the monitoring operator for the television system who observed the monitor image in a monitor 24.
  • the desired color balance is thus visually monitored.
  • a color temperature meter such as one of the type manufactured by Eastman Kodak Company, which is frequently used in con.. nection with particular types of color-sensitive films for color photography.
  • a color temperature meter of this general character has been described, for instance, in the Journal of the Society of Motion Picture Engineers, for March, 1939, in an article entitled A color temperature meter, by E. M. Lowry and K. S. Weaver, on pages 298 to 306 inclusive, vol. 32.
  • the neutral setting of the diversified color filter, to establish the desired color balance, will then be made to correspond to some predetermined specific color temperature for the particular film in use; and for any other color temperatures, the added color temperature scales or calibrations adjacent the control knobs 26, 28 and 3U, for instance, will indicate the proper setting or adjustment of the diversiiied color filter relative to the optical system for use of the system with an illuminant of that color temperature.
  • Suchy conditions ⁇ of course, are to be assumed and to apply rather rigidly where the illuminant which is illuminating the subject or body Il produces black body radiation at some chosen color temperature. which type of .radiation would reasonably closely be obtained where the illumination was either by sunlight, skylight, or incandescent lamps.
  • bicolor diversified color filters may have color areas meeting either along a line or at a point or along two lines. Other arrangementsare possible falling within the scope of this invention, both for bicolor and multicolor diversified color filters.
  • the key image section of the filter may occupy a. section of the complete filter 35, which might be represented by the filter area 6l in Fig. 7, with two-thirds of the remaining area of the complete filter then being occupied by the reddish-orange filter and one-third of the remaining area. being'occupied by the greenishblue filter. ⁇ or vice versa, as the case may be.
  • the lter element which applicant has herein termed a, diversified color filter, is of a character such as to be composed essentially of at least two areas of different colors which are introducible into the image forming light beam. Accordingly, the arrangement is of a character different indeed both as to its function and its operation from a single filter having areas of different shades of one and the same color.
  • the color areas may meet along straight lines, curves or, at least, in a sense, at a point where the color areas are sectors of a circle or the like, as is exemplified, for instance, by the arrangements of Figs. 8 and 9.
  • the areas may also meet at a point for circular sectors,
  • a neutral or inactive point on the diversified color filter is that point which, when placed on the axis of the optical system or on the central axis of the image forming beam, as may be the case, causes the diversified color filter to produce no change in,
  • the common point and the neutral point in a diversified color filter may not be, and frequently are not, coincident or identical in use.
  • television apparatus incorporating diversified color filters of any of the aforesaid types may readily be operated in such a way that the neutral setting of the filter corresponds to a state of very little cr practically. no absorption of light.
  • the filter comprises sectorial-shaped areas 11 for red; lli ⁇ for green; and 8l for blue, where, at the centralmost point, or the meeting point, the filters would have minimum light absorption and be practically clear (assuming the wedge character of the filter), but, toward the edge of the lter, the light and color absorption would increase.
  • the increases in density would, with this system, extend from the center outwardly so that the light absorption for any given amount of color balancing may be kept strictly at a minimum by providing adjustments from the center outwardly.
  • a filter of the wedge character (such as that shown by Fig. 8, for example, where the centermost part of the filter has minimum density and the outermost parts of the filter near the edges of the circle have greatest density) may be positioned in the optical path in such a way that the centermost part of the filter (such as the point 9
  • the desired range will be limited, but, in the event it is desired to increase the range over which the filter is effective so as to bring greater density areas nearer to the center of the lens aperture, for instance, the lter may be moved up and down along'a path, as indicated by the areas 89 in Fig. 9, to vary the range of control (e. g., to establish a decrease or increase) and then rotary motion of the filter will again provide the desired balance.
  • One essential feature is that by using filters of the wedge type as hereinabove explained it is possible to obtain greater compensation and greater corrections for a small or limited amount of motion or, for any predetermined amount of motion, greater or less absorptions can be obtained within the limits of motion. In all cases where a diversified filter is used, it is desirable to provide a multiplicity of color areas.
  • the diversified filter must be moved in at least one or two fashions of which one may be considered as a translatory motion having a component orthogonal to the optical axis or the center of the image forming light beam, or the other may be considered as being the case where the lter is so arranged as to be capable of rotary motion where there is a component of such rotary motion about an axis parallel to the central axis of the image forming beam, with the motion in either case being such that it produces a change in the relative proportions of the color areas comprising the filter with reference to the cross section of the image forming light beam intersected by the filter.
  • any consideration of the system as it embodies the light responsive camera tube, in combination with the means by whichhe light beams (representative of the selected component colors) are directed thereupon, when used with a diversified color filter of the character hereinabove explained, will be understood as incorporating features such that the diversified color filter may itself be adjusted to create a balance in the system which will compensate not only for optical changes but also for electrical changes. It happens frequently that changes in the video amplifiers and/or modulators, due, for example, to tube changes, voltage variations and the like, may frequently be compensated in the manner hereinabove explained through the adjustment of the diversified color filter, so that a color balance is obtainable without the introduction of electrical noise or disturbance.
  • a system which includes an image forming optical system, a light responsive image receiving area, and component-color filter mean's adapted to present light of different component colors to the light responsive image receiving area
  • the combination comprising a relatively fixed position color balancing filter element supported in intersecting relationship to and in a non-imaging position in the image forming light beam path of the optical system so as to include at least the complete beam cross-section, and means to adjust the said color balancing filter with a component of motion relative to the axis of the optical system and within the image forming light beam path so as to vary the proportions of the filter color areas in the optical path so as thereby to provide a controllably variable color range thereof toward and away from each .of the select-eci component colors as presented to the image receiving areas.
  • a light responsive image receiving area whereon impinging light causes a latent image to be developed
  • color filter means adapted'to move continuously and uniformly so invention, what is tnA colors so as to compensate for different color responses of the image receiving area.
  • a, plurality of component-color receiving area in each component color in seas sequentially to present rapidly changing light of different component colors to the light responsive image receiving area, a iixedly positioned color balancing filter element supported in intersecting relationship to and in a. nonimaging position in the image forming light beam path of the optical system so as to include at least the complete beam cross-section, and means to adjust the said color balancing filter .with a component of motion relative to the axis of the optical system and within the image forming light beam path so as to vary the proportions of the filter color areas thereof which are included in' the optical path so as thereby.
  • a normally lixedly positioned color balancing filter element said filter element having filter. areas of relatively low light absorption as compared with the absorption of the componentcolor separation filter elements, said color balancing filter element including a plurality of filter areas having colors of at least the majority of the component-color areas of the color separation filter but of lower saturation and absorption and being located to intersect and to include the complete optical beam path and in an out-offocus plane relative to the light responsive light image receiving area, and means to adjust the said color balancing filter with a transverse component of motion relative to the axis of the optical system so as thereby to vary the proportions of the several color filter areas of the color balancing filter simultaneously included in the optical path thereby providing a controllably variable color range in the light images reaching the image receiving area.
  • a plurality of componentcolor light absorption separation filter elements located in intersecting relationship to and including the complete optical path, means for rapidly and uniformly moving the said filter elements at a high repetition rate relative to the optical path so that light is revealed to the light responsive image receiving area in a sequence of cyclically changing component colors, a normally iixedly supported color balancing filter element also located in the optical path and arranged for relatively slow adjustment, said filter element having filter areas of relatively low light absorption as compared with the absorption of the componentcolorseparation filter elements, said color balancing filter element including a plurality of filter areashaving colors of at least the majority of the component-color areas of the color separation filter but of lower saturation and absorption and being located to intersect and to include the complete optical beam path and in an out-offocus plane relative to the light responsive light image receiving area, and filter control means to adjust the position of said color balancing filter within the optical path with a trans
  • a color balancing fllter element In combination with an image forming optical system and a light responsive light image receiving area to receive light directed through the optical system. a plurality of componentmoving the said filter elements relative to the optical path comparatively rapidly so that light is revealed to the light responsive image receiving area in each component color only at a given time, and for the several component colors in a predetermined sequence, a color balancing fllter element also positioned in the 'optical path and relatively slowly movable relative.
  • said color balancing filter element having filter areas of relatively low light absorption as compared with the absorption of the component-color separation filter elements, said color balancing filter element including a plurality of lter areas having colors of at least the majority of the component-color areas of the color separation filter but of lower saturation and absorption and being located to intersect and to include at least the complete optical beam path and in an out-,offocus plane relative to the light responsive light image receiving area, and means to adjust the said color balancing filter with a transverse component of motion relative to the axis of the optical system so as thereby to vary the proportions of the several color filter areas of the color balancing lter simultaneously included in the optical path thereby providing a controllably variable color range of light images directed upon the image receiving area.
  • a componentcolor light filter element assembly having relatively high light ab-sorption in the selected component colors of an additive color system, means for comparatively rapidly and transversely moving the said filter relative to the image forming light beam path for sequentially illuminating the mosaic target of the tube in light of predetermined component colors, a relatively slowly movable color balancing filter element having filter areas of relatively low light absorption as compared with the iilter areas of the componentcolor separation filter elementwith the color balancing filter elements being adapted to absorb substantially the same color light components as the component-color filter element, said color balancing filter element being positioned in intersecting relationship to and in anout-offocus position in the image forming light beam path so as to include atleast the complete beam cross-section, and means to adjust the said color balancing filter element along at least two adjustment paths so that a controll
  • a component-color light filter element assembly having relatively high light absorption in the selected component colors 'of an additive color system, means for relatively rapidly and transversely moving the filter while including the optical path for illuminating the mosaic target of the camera tube in light of predetermined component colors in a cyclic manner, a relatively slowly movable color balancing filter element having filter areas 26 of relatively low light absorption as compared with the filter areas of the component-color separation filter elements with the color balancing lter elements being adapted to absorb substantially the same color light components as the component-color filter element, said color balancing filter element being positioned in intersecting relationship to and in an out-of-focus position in the image forming light beam path so as to include at least the complete beam crosssection, and means to adjust the said color balancing filter element orthogonally relative to the light
  • A8 In a system of color television which embodies an electronic camera tube having a light responsive target element for receiving light images, an image forming optical system for directing the image forming light rays toward the said target element, and a component-color separation filter having color transmission sections corresponding to predetermined component -colors of an additive color process, and means for moving the separation iilter relatively rapidly relative tothe image forming light beam path for cyclically directing light in individual selected component colors to the tube target element, said color separation filter sections each having relatively high lght absorption, the combination comprising a relatively slowly movable color balancing filter element including a plurality of component-color filter areas of approximately the component colors of the separation filter and arranged in juxtaposition with respect to one another and havin-g light absorptions which are relatively low as compared with the sections of the color separation filter, and said color balancing filter being positioned substantially transverse to the axis of the optical system and embracing an area at least as great as the complete light beam cross-section and also being located in an
  • color balancing lter adjustment means comprises means for shifting the filter in one direction along a substantially straight line path and additional means for providing movement of the filter in a second path independently of the first motion.
  • a television system which embodies an electronic camera tube having a light responsive target element for receiving light images, an image forming optical system for directing image forming light rays toward the said target element, a component-color separation filterv assembly having color transmission sections corresponding to predetermined component colors of an additive color system, and means for rapidly,
  • the combination comprising a color balancing filter element including a plurality of component-color filter areas of approximately the component colors of the separation filter and arranged in juxtaposition with respect to one another and having light absorptions which are relatively low as compared with that of the filter sections of the color separation filter, and said color balancing filter being positioned in the image forming light beam path of the optical system in intersecting relationship thereto and in an out-of-focus position with respect to images formed upon the camera tube mosaic element, and means to adjust the color balancing filter relative to the axis of the optical system and while encompassing the image forming light beam path so as to vary the portions of the color filter areas of the different component colors included in the optical path to the mosaic electrode so as thereby to compensate and controllably vary the color range of the color image directed upon the mosaic.
  • a multicolor television system having a light responsive image receiving target, an optical means to project light images upon the target so as thereby to cause the development of electrostatic charges thereon in accordance with the intensity of the impinging optical images, and means to scan the light responsive image receiving target to transfer to a communication channel signal wave train outputs of magnitudes proportional to the intensity of the impinging light
  • the combination which includes a componentcolor separation element having a plurality of filter sections of relatively high light absorption and with at least one filter section of each component color of anadditlve color system, said filter being located in the optical path so that each filter area embraces the said path, means for moving the filter relatively rapidly relative to the light beam path at a uniform rate for cyclically and sequentially passing light of each selected component 4color of the multicolor system to the light sensitive target element; a relatively slowly movable color balancing filter element comprising also a plurality of filter sections also of the said chosen component colors and of relatively low light absorption compared with the sectional areas of the color separation filter and positioned and within the image
  • a multicolor image resolving system having a light responsive image receiving target element and an optical means to project light images upon the target so as thereby to cause the development thereon of a latent image representative of the varying intensities of light and shadow of the impinging optical images
  • the combination which includes a component-color separation element positioned for sequentially and relatively rapidly revealing light in a repeating sequence in said selected component color of the multicolor system to the light sensitive target element, a second filter element comprising a plurality of filter sections also of the said chosen component colors and of relatively low light absorption compared with the color separation filter positioned to include at least the complete crosssection of the image forming light beam path so that all filter sections thereof may be included within said path simultaneously, said colorbalancing filter being positioned in a non-image forming location relative to the image cast upon the light responsive target, and means to vary the position of the color balancing filter transverse to the optical axis so that the proportions of the color balancing filter areas of the different component colors simultaneously included within the optical path may be varied
  • a multicolor television system having a light responsive image receiving target, an optical means to project light images upon the target so as thereby to cause the development of electrostatic charges thereon in accordance with the intensity of the impinging optical images, and means to scan the light responsive image receiving target to develop signal wave train outputs of magnitudes, ⁇ proportional to the intensities of the impinglng light, which signals are adapted to be supplied to a transmission channel, the combination which includes a component-color separation element for sequentially and relatively rapidly transmitting light in each selected component color of the multicolor system to the light sensitive target element, a second lter element comprising a plurality of filter sections also of the said chosen component colors and of relatively low light absorption compared with the color f separation filter positioned to include at least the complete cross-section of the image forming light beam path so that at least portions of all filter sections thereof may be included within said path simultaneously, said color balancing filter being positioned in a non-image forming location rela tive to the image cast upon the light responsive target, and means to vary the position of
  • a multicolor television system having a light responsive image receiving target, an optical means to project light images upon the target so as thereby to cause the development of electrostatic charges thereon in accordance with the intensity of the impinging optical images, and means to scan the light responsive image receiving target to develop signal wave train outputs of magnitudes proportional to the intensities of the impinging light, which signals are adapted to be supplied to a transmission channel, the combination which includes a component-color separation element supported for sequentially, cyclically-and relatively rapidly revealing light in each selected component color of the multicolor system to the light sensitive target element at a high velocity so that repetition occurs at a. frequency at least as high as that of the persistence of vision, a second filter element comprising a.
  • plurality of filter sections also of the said chosen component colors and of relatively low light absorption compared with the color separation filter normally fixedly positioned to include at least the complete cross-section of the image forming light beam path so that at least portions of all filter sections thereof may be included Within said path simultaneously, said color-balancing filter being positioned in a non-image forming location relative.
  • a multicolor television system having a light responsive image receiving target, an optical meansto project light images upon the target so as thereby to cause the development of electrostatic charges thereon in accordance with the intensity of the impinging optical imagesy and means to scan the light responsive image receiving target to develop signal wave train outputsof magnitudes proportional to the impinging light, which signals are adapted to be supplied to a transmission'channel, the combination which includes a component-color separation element for sequentially and relatively rapidly passing light in each selected component color of the multicolor system to the lightl sensitive target element, a second filter element comprising aplurality of filter sections also of the said chosen component colors and of relatively low light absorption compared with the color separation filter positioned to include at least the complete cross-section of the image forming light beam path so that at least portions of all iilter sections thereof may be included within said path simultaneously, said color balancing filter being positioned in a nonimage forming location relative to the image formed upon the light responsive target, and means to vary the position of the color-balancing iil
  • a system for obtaining color balance in multicolor television systems of the'type Wherein optical images are directed by an optical system tovfocus upon an image receiving element, which comprises a component color separation lter element for forming, with progressive and sequential changes in the filter color component included in the optical path ofthe system, a sequence of compo-nent color light images which are developed and directed along the optical axis of the optical system and focused upon the image receiving element, a color balance ilter element located in an out-of-focus plane remote from the image receiving element upon which the component color light images are focused for intercepting predetermined quantities' and color qualities of the light images directed along the optical axis of the system to the image receiving element, and means for controllably varying the light interception by the second filter element in the selected multicolor components to selected degrees to compensate for variance in the color of the iiluminant and the degree of chromatic response and sensitivity of the light image receiving element upon which the image is focused and the therewith associated system.
  • a first cyclically movable filter means for presenting as a repeating sequence a series of color images produced in sequence by light rays representative of an image passing through individual selected component color filter elements of the group of filter elements forming the complete filter so that light rays of each selected component color of the image are caused to influence the light responsive camera tube
  • the combination of a second movable filter means for balancing the color response of the light responsive camera tube to each of the color components, and means for controllably moving the second filter relative to the first filter and to the camera tube for intercepting controllably variable quantities and color qualities of the said component color images which arey focused upon the light responsive camera tube.
  • a light responsive camera tube which is adapted to be scanned at a selected field repetition rate to produce signal outputs representative of the said component color images
  • a first component color separation filter unit positioned relative to the camera tube to expose the camera tube, with a cyclic and progressively sequential change in the color component of the iilter instantaneously included in the light path, to a sequence of light images of the selected component colors at a rate coinciding with the selected field scanning rate
  • a color balancing filter for separately modifying the light image rays directed upon the camera tube by the component color separation lter so as to compensate for changes in color ⁇ of the illuminant and chromatic response of the said camera tube and the output system associated therewith in each of the color components, and means to move the color balancing filter relative to the component color separation filter and to the camera tube for intercepting predetermined quantities and color qualities
  • the method of obtaining color balance in multicolor television systems including a camera tube having a light responsive storage electrode element having 4different responses to different selected component colors which comprises forming a multicolor image in a selected number of component colors while directing the light rays from an object along a predetermined light beam path, focusing the component color images upon the light responsive storage electrode of the camera tube to produce thereby electrostatic charge representations of magnitudes proportional to thegbrilliance of the focused images', scanning the light responsive electrode to produce output image signals therefrom to be applied to a transmission channel, intercepting predetermined quantities and color qualities of thelight of the component colors along the light beam path in a plane remote from the focal plane of the light images, and 'controllably varying the color interception of each of the selected color components' to predetermined degrees to compensate for response variations of the camera tube to the different component colors.
  • the method of obtaining color balance in multicolor television systems including a camera tube having a light responsive storage electrode element having different responses to different selected component colors which comprises forming a sequence. of color images in a predetermined selected number of component colors at a predetermined rate while directing the light rays from an object along a predetermined light beam path, focusing the component color images upon the light responsive storage electrode of the camera tube to produce thereby electrostatic charge representations of magnitudes proportional to the brilliance of the focused images, scanning the light responsive electrode at a scanning rate corresponding to the rate of component color image formation to produce output image signals therefrom to be applied to a transmission channel, intercepting predetermined quantities and color qualities of the light of the component colors along the light beam path in a plane remote from the focal plane of the light images, and controllably varying, at a rate slow relative to the scanning rate,
  • the method of obtaining color balance in multicolor light responsive systems including a light image receiving element having a light response characteristic of a different nature for each of a plurality of selected component colors which comprises forming a multicolor image in a selected number of component colors while directing the light rays from an object along a predetermined light beam path, focusing the component color images upon the light image receiving element to produce thereby image representations proportional to the brilliance of the focused images, intercepting predetermined quantities and color qualities of the light of the component colors along the light beam path in a plane remote from the focal plane of the light images, and controllably varying the color interception of each of the selected color components to predetermined degrees to compensate for response variations of the light image receiving element in the different component colors.
  • An optical system comprising a lens element for focusing an optical image directed thereupon at a remotely spaced image plane, a relatively rapidly movable color separation unit located in the optical path for producing a plurality of component color images of the optical image directed into the optical system in a predetermined sequence at the spaced image plane, and a color balancing filter element having a plurality of color filter areas of relatively low light absorption of colors substantially corresponding to the component colors into which the optical image is formed, said color balancing filter element being positioned in the light path of the optical image so that predetermined areas of all separate areas thereof are simultaneously included in the optical path to provide predetermined color balancing.
  • optical system claimed in claim 22 comprising, in addition, means for adjusting the position of the color balancing filter element relative to the said optical path to vary thereby the relative areas of the selected component colors which are simultaneously .included in the optical path.
  • a component color separation filter element arranged sequentially to present, at a repetition rate which is synchronous with the field scanning repetition rate, light images in different component colors to the light responsive image receiving element, a relatively stably located color balancing filter element located in intersecting relationship to and in a non-imaging position in the image forming light beam path of the optical system so as to include at least the complete light beam cross-section as projected through component color separation iilter and the optical system, and means to adjust the said color balancing filter with a component of motion relative to the'axis ofthe optical system and within the image forming light beam path so as to vary the proportions of the lter color areas in the optica1 path so as thereby to provide a controllably variable color range thereof toward and away from each of the selected component colors.
  • a system for obtaining color balance in multicolor television systems which comprises light image receiving means having light re sponse characteristics 4which are different in nature for each of a plurality of selected component colors into which an optical image is analyzed for transmission, an optical device to direct and focus component color light images into the light image receiving means to produce image representations proportional to the brilliance of the focused light image, and a controilably movable color balancing filter element having low color selectivity characteristics as compared to the color selectivity of the overall system in each component color of the light directed through the optical device, which color selectivities due to the color balance filter element are determined in accordance with the positioning of the color balance filter relative to the optical device so as to compensate for response variations of the light image receiving means in the different component colors.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Color Television Image Signal Generators (AREA)
  • Endoscopes (AREA)
US512119A 1943-11-29 1943-11-29 Color television system Expired - Lifetime US2416918A (en)

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FR955405D FR955405A (de) 1943-11-29
NL73157D NL73157C (de) 1943-11-29
US512119A US2416918A (en) 1943-11-29 1943-11-29 Color television system
GB20745/45A GB599134A (en) 1943-11-29 1944-10-25 Improvements in image forming optical systems, for use in colour television apparatus or colour photography

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US2544196A (en) * 1947-08-04 1951-03-06 Pavelle Color Inc Photoelectric color analyzer
US2559843A (en) * 1946-12-05 1951-07-10 Rca Corp Television system
US2570723A (en) * 1946-11-21 1951-10-09 Rca Corp Television system
US2630485A (en) * 1950-09-11 1953-03-03 Color Television Inc Color television apparatus
US2635142A (en) * 1951-02-08 1953-04-14 Zenith Radio Corp Television apparatus
US2703340A (en) * 1951-07-20 1955-03-01 Walter Mellott Color television system
US2850563A (en) * 1951-11-08 1958-09-02 Edgar Gretener A G Dr Processes for the reproduction of images in color
US3093704A (en) * 1957-11-05 1963-06-11 Cft Comp Fse Television Color television camera systems
US3410626A (en) * 1964-04-28 1968-11-12 Baird Atomic Inc Interference filter
US4687926A (en) * 1984-12-20 1987-08-18 Polaroid Corporation Spectrally filtered lens producing plural f-numbers with different spectral characteristics
US4797734A (en) * 1984-01-31 1989-01-10 Canon Kabushiki Kaisha Pickup apparatus

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GB8617549D0 (en) * 1986-07-17 1986-08-28 Atherton E J Obtaining precise positional control

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US562642A (en) * 1896-06-23 Photographic color-screen
US740484A (en) * 1903-05-04 1903-10-06 Rollin H Stocoum Photographic ray-filter.
US1154607A (en) * 1908-03-07 1915-09-28 Charles L A Brasseur Screen for color photography.
US1598956A (en) * 1922-01-21 1926-09-07 Eastman Kodak Co Photographic multiple projection printer
US2010307A (en) * 1931-06-06 1935-08-06 Le Roy J Leishman Means and method for coloring light formed images
US2285262A (en) * 1939-05-06 1942-06-02 Gen Aniline & Film Corp Process and apparatus for the printing of subtractive multicolor images

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Publication number Priority date Publication date Assignee Title
US562642A (en) * 1896-06-23 Photographic color-screen
US740484A (en) * 1903-05-04 1903-10-06 Rollin H Stocoum Photographic ray-filter.
US1154607A (en) * 1908-03-07 1915-09-28 Charles L A Brasseur Screen for color photography.
US1598956A (en) * 1922-01-21 1926-09-07 Eastman Kodak Co Photographic multiple projection printer
US2010307A (en) * 1931-06-06 1935-08-06 Le Roy J Leishman Means and method for coloring light formed images
US2285262A (en) * 1939-05-06 1942-06-02 Gen Aniline & Film Corp Process and apparatus for the printing of subtractive multicolor images

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2570723A (en) * 1946-11-21 1951-10-09 Rca Corp Television system
US2559843A (en) * 1946-12-05 1951-07-10 Rca Corp Television system
US2544196A (en) * 1947-08-04 1951-03-06 Pavelle Color Inc Photoelectric color analyzer
US2630485A (en) * 1950-09-11 1953-03-03 Color Television Inc Color television apparatus
US2635142A (en) * 1951-02-08 1953-04-14 Zenith Radio Corp Television apparatus
US2703340A (en) * 1951-07-20 1955-03-01 Walter Mellott Color television system
US2850563A (en) * 1951-11-08 1958-09-02 Edgar Gretener A G Dr Processes for the reproduction of images in color
US3093704A (en) * 1957-11-05 1963-06-11 Cft Comp Fse Television Color television camera systems
US3410626A (en) * 1964-04-28 1968-11-12 Baird Atomic Inc Interference filter
US4797734A (en) * 1984-01-31 1989-01-10 Canon Kabushiki Kaisha Pickup apparatus
US4687926A (en) * 1984-12-20 1987-08-18 Polaroid Corporation Spectrally filtered lens producing plural f-numbers with different spectral characteristics

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NL73157C (de)
FR955405A (de) 1950-01-14

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