US2328145A - Color television - Google Patents
Color television Download PDFInfo
- Publication number
- US2328145A US2328145A US407537A US40753741A US2328145A US 2328145 A US2328145 A US 2328145A US 407537 A US407537 A US 407537A US 40753741 A US40753741 A US 40753741A US 2328145 A US2328145 A US 2328145A
- Authority
- US
- United States
- Prior art keywords
- color
- line
- plate
- image
- receiver
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000003086 colorant Substances 0.000 description 5
- 239000010445 mica Substances 0.000 description 4
- 229910052618 mica group Inorganic materials 0.000 description 4
- 230000000875 corresponding effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
- H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
- H01J29/36—Photoelectric screens; Charge-storage screens
- H01J29/39—Charge-storage screens
- H01J29/43—Charge-storage screens using photo-emissive mosaic, e.g. for orthicon, for iconoscope
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J31/00—Cathode ray tubes; Electron beam tubes
- H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
- H01J31/26—Image pick-up tubes having an input of visible light and electric output
- H01J31/46—Tubes in which electrical output represents both intensity and colour of image
Definitions
- an independent scanning beam is used for each of the color elements which it is desired to reproduce in the viewed image.
- a multi-colour mosaic line screen between which and the line plate is arranged a mica plate or like insulating element.
- a multi-line plate is provided, each of the line sections corresponding to one of the colors of the system.
- Figure 1 is a diagrammatic view of part of the transmitting apparatus according to the present invention as applied to a four-color system
- Figure 2 is an enlarged section through the image plate shown in Figure 1.
- Figure 3 is a diagrammatic view illustrating one method of producing a multi-section line plate for use in the apparatus shown in Figure 1.
- Figure 4 illustrates part of a receiving apparatus according to the present invention adapted for direct viewing
- Figure 5 illustrates a similar apparatus by means of which the image may be projected on to a screen.
- the drawing indicates the present invention as applied to a four-color system of television and the electron camera ( Figure .1) is provided with four independent scanning beams shown in broken lines provided by four independent cathodes shown diagrammatically at H, l2, l3 and I4.
- a four-color line screen which consists of' a transparent plate I 5, a mica plate or the like It and a mosaic metal coating II arranged between said transparent plate l5 and said mica plate I6.
- a four-line plate I8 is provided, each line extending from side to side of the surface and the lines being correlated with the lines of vthe mosaic color line screen so that each of the line sections corresponds to one of the colors (see Figure '2).
- a multiple line plate I8, as above described, may be formed of the appropriate number of sheets of tin foil 20 appropriately insulated from one another and folded backwards and forwards, as shown in Figure 3. The folds are pressed together and clamped edgewise against the mica plate IS in register with the mosaic screen. Alternatively, the same may be produced photographically, or in any other desired manner.
- Each of the line sections of the plate [8 is fed to'a separate amplifier and modulator or transmitter by means of the independent lines 2
- a similar arrangement is used at the receiver (see Figures 4 and 5), the individual cathode ray beams 30,. shown in broken lines and provided by individual cathodes, being modulated in accordance with modulation effected for the individual colors of the image at the transmitter in the usual way.
- the imageat the receiver may be viewed directly on the fluorescent screen 29 without the aid of auxiliary light, as shown in Figure 4, in which the lens unit 3! may, if desired, be omitted.
- an auxiliary light from a source 32 may be passed through the mosaic color line screen, as shown in Figure 5.
- the mosaic screensused at the transmitter and receiver are, of course, identical and suitably positioned relative to the image-receivingscreen in both cases and, accordingly, like references have been used in Figures 4 and 5 to indicate the parts corresponding to those shown in Fig-- ure 1.
- the color line screen acts in eo-operation'with the colored image of the object or scene being televised'in the same way as in color photography-or cinematography to filter out the colors.
- green light from the object or scene will be stopped by the red line of the screen (if it be complementarily colored), and no image will be thrown on to the particular line of the line plate 18 at this point. There will thus be no modulation of the corresponding transmitted frequency.
- the color line screen acts in the same way as a similar device in a like system of color cinematography.
- a multi-color television system comprising a transmitter and a receiver, each having means for using an independent individually controlled scanning beam for each of the separate colors 10 of the system, image plates at the transmitter and the receiver including like multi-color m0- saic line screens, a multi-element line plate at the transmitter, said multi-element line plate having one element for each color, and an auxiliary source of light at the receiver to pass light through the mosaic line screen at the receiver in order to render the image visible.
Description
1943- B. T. HEWSON 2,328,145
COLOR TELEVISION Filed Aug. 20, 1941 jerh'arn 1 m Haw/Son INVEN TOE,
Patented Aug. 31, 1943 COLOR TELEVISION Bertram Tom Hewson, London, England Application August 20, 1941, Serial No. 407,537 In Great Britain June 15, 1939' 1 Claim.
In my co-pending patent applications Serial Nos. 360,352, 360,353 and 360,354, I have described and claimed certain methods of producing colored images which are applicable to color television. The present invention is concerned with certain modifications of the methods of color television described in my said co-pending patent application, and has for its chief object to provide a simple system of color television.
According to the principal feature of the present invention, an independent scanning beam is used for each of the color elements which it is desired to reproduce in the viewed image.
Over the image plate of the usual electron vcamera is disposed a multi-colour mosaic line screen between which and the line plate is arranged a mica plate or like insulating element. Instead of a single line plate, as is usual in monochromatic television, a multi-line plate is provided, each of the line sections corresponding to one of the colors of the system.
In order that this invention may be the more clearly understood and readily carried into eiiect, I will proceed to describe the same with reference to the accompanying drawing, which illustrates by way of example certain embodiments of this invention, and in which:
Figure 1 is a diagrammatic view of part of the transmitting apparatus according to the present invention as applied to a four-color system,
Figure 2 is an enlarged section through the image plate shown in Figure 1.
Figure 3 is a diagrammatic view illustrating one method of producing a multi-section line plate for use in the apparatus shown in Figure 1.
Figure 4 illustrates part of a receiving apparatus according to the present invention adapted for direct viewing, and
Figure 5 illustrates a similar apparatus by means of which the image may be projected on to a screen.
Referring now to the drawing, it will be seen that for the sake of clarity the actual amplifying, transmitting and receiving apparatus has not been shown in the drawing. Such apparatus may follow standard practice and detailed description of the same is deemed to be unnecessary.
The drawing indicates the present invention as applied to a four-color system of television and the electron camera (Figure .1) is provided with four independent scanning beams shown in broken lines provided by four independent cathodes shown diagrammatically at H, l2, l3 and I4.
Over thediiiage plate is disposed a four-color line screen which consists of' a transparent plate I 5, a mica plate or the like It and a mosaic metal coating II arranged between said transparent plate l5 and said mica plate I6. Instead of a single line plate, as is usual in monochromatic television, a four-line plate I8 is provided, each line extending from side to side of the surface and the lines being correlated with the lines of vthe mosaic color line screen so that each of the line sections corresponds to one of the colors (see Figure '2).
A multiple line plate I8, as above described, may be formed of the appropriate number of sheets of tin foil 20 appropriately insulated from one another and folded backwards and forwards, as shown in Figure 3. The folds are pressed together and clamped edgewise against the mica plate IS in register with the mosaic screen. Alternatively, the same may be produced photographically, or in any other desired manner. Each of the line sections of the plate [8 is fed to'a separate amplifier and modulator or transmitter by means of the independent lines 2|, 22, 23 and 24 so that the individual color impulses may be selectively transmitted by the transmitter and received at the receiver. 1
A similar arrangement is used at the receiver (see Figures 4 and 5), the individual cathode ray beams 30,. shown in broken lines and provided by individual cathodes, being modulated in accordance with modulation effected for the individual colors of the image at the transmitter in the usual way. The imageat the receiver may be viewed directly on the fluorescent screen 29 without the aid of auxiliary light, as shown in Figure 4, in which the lens unit 3! may, if desired, be omitted. Alternatively, an auxiliary light from a source 32 may be passed through the mosaic color line screen, as shown in Figure 5. The mosaic screensused at the transmitter and receiver are, of course, identical and suitably positioned relative to the image-receivingscreen in both cases and, accordingly, like references have been used in Figures 4 and 5 to indicate the parts corresponding to those shown in Fig-- ure 1.
At the transmitter, the color line screen acts in eo-operation'with the colored image of the object or scene being televised'in the same way as in color photography-or cinematography to filter out the colors. Thus green light from the object or scene will be stopped by the red line of the screen (if it be complementarily colored), and no image will be thrown on to the particular line of the line plate 18 at this point. There will thus be no modulation of the corresponding transmitted frequency. At the receiver, the color line screen acts in the same way as a similar device in a like system of color cinematography.
I claim:
A multi-color television system, comprising a transmitter and a receiver, each having means for using an independent individually controlled scanning beam for each of the separate colors 10 of the system, image plates at the transmitter and the receiver including like multi-color m0- saic line screens, a multi-element line plate at the transmitter, said multi-element line plate having one element for each color, and an auxiliary source of light at the receiver to pass light through the mosaic line screen at the receiver in order to render the image visible.
BERTRAM TOM HEWSON.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2328145X | 1939-06-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
US2328145A true US2328145A (en) | 1943-08-31 |
Family
ID=10903929
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US407537A Expired - Lifetime US2328145A (en) | 1939-06-15 | 1941-08-20 | Color television |
Country Status (1)
Country | Link |
---|---|
US (1) | US2328145A (en) |
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1941
- 1941-08-20 US US407537A patent/US2328145A/en not_active Expired - Lifetime
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