US2011271A - Television system - Google Patents

Television system Download PDF

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Publication number
US2011271A
US2011271A US351488A US35148829A US2011271A US 2011271 A US2011271 A US 2011271A US 351488 A US351488 A US 351488A US 35148829 A US35148829 A US 35148829A US 2011271 A US2011271 A US 2011271A
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US
United States
Prior art keywords
light
path
mirror
disk
paths
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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
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US351488A
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English (en)
Inventor
Cioffari Bernard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RCA Corp
Original Assignee
RCA Corp
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Filing date
Publication date
Priority to NL28960D priority Critical patent/NL28960C/xx
Application filed by RCA Corp filed Critical RCA Corp
Priority to US351488A priority patent/US2011271A/en
Priority to GB10391/30A priority patent/GB351972A/en
Application granted granted Critical
Publication of US2011271A publication Critical patent/US2011271A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/02—Scanning details of television systems; Combination thereof with generation of supply voltages by optical-mechanical means only
    • H04N3/08—Scanning details of television systems; Combination thereof with generation of supply voltages by optical-mechanical means only having a moving reflector

Definitions

  • the present invention relates to television systems, and, more'particularly, to. a method and means for scanning and reproducing a television
  • a method and means for scanning and reproducing a television In the prior art, so far as I ⁇ am' aware, it has hereinbefcre been customary to utilize, ⁇ for the purpose of scanning and reproducing, disks of rather large size in orderto provide suicient detail by which the television picture received may be readily recognized and be of considerably clearer detail.
  • a further object of my invention is to provide amethod and means for scanning and reproducing television subjects in which the rotating elements4 necessary have been materially reduced in size so that they may be driven by the smallest types of synchronous motors which, in'turn, may synchronized' by the use of a small amount of energy such as is obtainable from a synchronizing signal simultaneously transmitted with the -television.k n
  • a further object of my invention is to provide aV method and means forscanning television subjects which will materially reduce the installa- 5 tion expense, since the parts thereof have been reduced to a minimum, and, consequently, less expense for lenses if a lens disk be used, or mirrors, if a mirror disk be used, is necessary.
  • Still another object of my invention is to pro- 10 vide a method and means by which the speed at which the ⁇ television subject may be scanned may be considerably increased, and, thus, the objectionable eiects of iiicker in the reproduced image substantially avoided.
  • Such arrangement is possible with a considerable reduction in the size of the moving elements which are thus capable or higher speeds, and which can be driven by smaller motors, and vby which it is possible to considerably increase the optical efliciency of the entire system.
  • Still another object of my invention is to provide a method and means for scanning and reproducing television subjects which is simple in its construction and Varrangement of parts, a system which is durable, compact, conveniently installed, readily set up, easily operated, efficient in its usej-,and readily adapted to use in conjunction with the present types of transmitting and receiving circuits and apparatus.
  • Y Fig. 1 illustrates an arrangement disclosing the principle of my invention utilizing a small disk having only four reecting surfaces;
  • FIG. 2 illustrates conventionally a form of ap- 40 paratus especially suited to the purpose and arrangement of my invention
  • Fig. 3 diagrammatically illustrates a further arrangement of the invention
  • Fig. 4 diagrammatically illustrates the paths by 45 which the television subject is exposed to scanning rays of light, or by which the paths of light of varying intensity, controlled in accordance with the intensity of light and shadow on the television subject, may be reproduced;
  • Fig. A5 discloses a modification of my invention as applied to 'a-lens disk type of scanning element in contrast to the mirror disk disclosed by Figs.
  • Fig. 7 conventionally illustrates the manner' in which the picture is rebuilt when using a disk and cooperating fixed mirror surfaces of the type shown by Fig. 2.
  • Fig. l suppose, for example, that only four mirrors, I, 2, 3 and 4, were arranged about the periphery of a scanning disk; ⁇ Then, as this disk rotates in the direction shown by the arrow, and a mirror moves from the position a to the position bi, the light reected by the mirror will rotate through a wide angle, and turn from the position a to the position b'.
  • Tc utilize the ⁇ entire angular sweep between a and b', it would be necessary to place a circular cr cylindrical screenin the path of the reflected light beams.
  • Such a system is, of course, not particularly feasible, and even aside from this feature, only four lines on the screen would be produced.
  • a simple way to surmount such a diiculty is to arrange a plurality of stationary mirrors about the arc of a circle upon which the light is reiected, and 'to so tip and vtilt the mirrors that'each mirror will reflect the light therefrom to the same screen.
  • Fig. 2 showing a preferred form of' arrangement of my invention, assuming that instead of using a disk composed of only four mirror elements, as shown by Fig. l., that the number of mirror elements were substantially increased, and, for example, as shown by Fig. 2, that these elements were increased to twelve mirrors placed about the periphery of the disk, and each tilted ata slightly different angle to the plane ofthe disk. This would mean that, as the disk is rotated in the direction.
  • a screen such as the planar dotted outline screen
  • a plurality of narrow mirrors IZ, I3, I4, I5 and I6 each covering l2 of the 60 degrees should be placed in the path of the rotating light beam reected from the mirror surfaces I, 2, 3, etc., of the disk II. Then, as the disk II rotates the beam of light refiected from each of the mirrors I, 2, 3, etc., in sequence will sweep across the arc of a circle from point c to po-int f.
  • each mirror surface arranged about the arc of the circle I0 willproduce on a screen I'l" arranged to receive the light received from the mirrors a single spot of light extending from points somewhat to the right and left, respectively, of the points f and c on the viewing surface II, it being understood from Fig. 3 that mirror wheel II is positioned outside the light path from reflectors I2 to IE and screen I'I.
  • each of the separate and individual mirrors I2, I3, I II, I5 and I6 isset and Atilted, at slightly different angles, both as regards horizontal and vertical tilting, with respect to each other so that as any one beam of light is caused to travel across the screen I1 a path of light will be traced between the points f and c as the light beam reflected from any of the elemental surfaces I, 2, 3, etc., reaches each of the individual mirrors I", I5, Ill, etc.
  • This principle has been conventionally illustrated by Fig.
  • the path of the reflected light beam projected towards the screen I'I has assumed a position as after which the mirror surface 2 positioned about the pcriphery of the disk II is in the path of the projected light from the source I8', which, for example, may be a glow lamp illuminated byvincoming television signals for the purpose of ⁇ reproducing, or may be an'arc source of light, if the system is to be used as an analyzing system for transmission purposes, and the subject for transmission is then positioned at the point Where the screen II is located, and the path of light initially traced by light from the source I6 being reflected from the mirror surface 2 towards the mirror It, will bealong thepath b1, and following the example shown above in connection with the mirror Il, the successive paths of illumination of the screen I'I will be along the lines bz,
  • Fig. 3 I have shown an elevation view schematically describing the system hereinabove described in connection with Figs. 2 and 4, and light from the source IS is shown as projected upon a mirror 'I located on the periphery of Uthe disk Il, and then reflected to the center mirror zI4 of ⁇ the fixed bank of mirrors, each tilted at a different angle with respect to the horizontal and vertical axis, and arranged about the arc of acircle.
  • ⁇ It is thus seenthat the reflected beam of light from the mirror surface ofthe disk II and the fixed mirror I4 will trace a path designated, as g3 and project itself upon the screen Il.
  • mountedon shaft 22 through which light from a, similar source i8 is projected and directed along a bank of mirrors arranged similarly to those shown and described in connection with Fig. 2.
  • the disk 2i rotates in the direction ⁇ of the arrow, the light beams issuing therefrom may be arranged to trace similar parallel paths across the screen Il to those shown and described in connection with thevabove named figures of the drawing.
  • FIG. 7 I have shown in a diagrammatic manner the picture which is produced according to my above escribed invention.
  • the lines produced by the mirror surfaces I, 2, 3, etc. of the disk II have been indicated by a corresponding number with an exponent corresponding to the mirror surface of the fixed reecting body Vfrom which the light is re-directed.
  • the method of scanning which consists in directing light from a light source in a single beam, continuously directing said beam along an arcuate path, consecutively reecting said beam in different planes whereby it traces a plurality of different elemental width parallel paths each covering one dimension of a picture surface which is spaced away from said arcuate path.
  • the method of scanning which includes generating a light beam oi'. an intensity corresponding to the intensity of light and shadow on elemental areas of a television subject, directing the produced light in a single beam, sequentially projecting the light beam along a series of predetermined spaced arcuate paths, and consecutively reflecting the light beams along a plurality of different adjacent parallel planes each covering one dimension of a picture surface and each of elemental width during periods of change in the sequence of arcuate motions of the light beam.
  • the method of scanning and reproducing which includes producing Y light beams and directing the same along a predetermined path, continuously directing the said beams along a plurality of arcuately spaced paths and successively reflecting said beam in different planes for tracing a plurality of additional paths of light along a succession of transverse sections of elemental width and a length equal to one dimension of a ield of View.
  • means for producing light intensities corresponding to the intensities of light and shadow on elemental areas of a television subject means for projecting said light beams along a predetermined path, a disk for continuously changing the path of said projected light beams to a plurality of spaced parallel paths, and a Xed set of mirrors for continuously deiiecting the said projected light beams along successive transverse parallel paths across one dimension of a picture surface and each of elemental width interspersed between said parallel paths produced by said initial changes in path of said light beams, and a screen positioned in the path of said last named reilected light beams for producing a visible image of the television subject.
  • a light source means for projecting the light issuing from said source along a predetermined path, rotating means for continuously deflecting said projected light beams along a plurality of spaced horizontal paths, means positioned in the path of said deilected light beams for successively changing the path of each of said deected light beams into a plurality of adjacent parallel paths each of elemental width and vinterspersed in a vertical plane between said iirst named group of parallel paths so as toV traverse the picture area fully in one direction, and a screen means successively illuminated by all said elemental width parallel paths of light.
  • a light source means for projecting the light issuing from said source along a predetermined path, a rotating diskrneans positioned in the path of said projected light beams, means provided by said disk for successively projecting said light beams along a plurality of spaced parallel paths, means iixed in position and located in the path of said projected light beams for controlling the said projected light beams and tracing the same along a plurality of parallel paths each of elemental width and across the length of the picture surface interspersed between said rst named group of parallel paths, and a screen positioned in the path of all of said reflected light beams.
  • a light source means for projecting the light issuing from said source along a predetermined path
  • a rotating disk positioned in the path of said projected light beams forcontinuously and successively reflecting said light beams along spaced parallel paths
  • a fixed bank of mirrors in the path of said reflected light beams for directing each separately projected light beam from said disk into a number of-distinct transverse parallel sections each of velemental width and equal tothe length of the neld Yof View
  • a screen positioned in the path of the reflected light from said iiXed bank of mirrors.
  • means for producing light beams of predetermined intensities means for projecting said light produced along a predetermined path, means for continuously changing the path ofsaid light beams to a plurality of spaced paths, means for continuously deiecting said rst named projected light beams along a series of parallel transverse paths equal to the length of the eld of view interspersed between said iirst named paths produced by said initial change in the path of said light beams, and a screen positioned in the path of said last named reflected light beams for producing a visible image of a television subject.
  • a light source means for projecting the light issuing from said source along a predetermined path, rotating means for continuously reiiecting said projected light beamsalong a plurality of spaced paths, means positioned in the path of said deflected light beams for successively changing the path of each projected light beam into -a plurality of adjacent parallel lines each of elemental width and equal to the length of the eld of view interspersed between the said group of spaced light paths, and a screen means positioned in the path of all of said light beams for producing a Visible image thereon when illuminated successively by all of said paths of light.
  • a light source means for projecting the light issuing from said source along a predetermined path
  • a rotating disk means positioned in the path of said projected light beams for successively projecting said light beams along a plurality of spaced paths
  • means positioned in the path of said light beams projected by said disk for controlling said projected light beams and tracing the same along a plurality of adjacent paths each of elemental width and of a length corresponding to that of one dimension of the picture subject and interspersed between said first named spaced paths
  • a screen positioned in the path of all said reflected light beams so as to produce a visible image when all of said light beams are successively traced across the same.
  • a rotary scanning disk for tracing a series of separated paths oi' light, and a plurality of fixed reflecting bodies in the path of each separate light path for so directing each successive path of light traced by the said rotary scanning disk as to form a plurality of parallel interspersed light paths each of elemental width and equal in length to one dimension of the picture.
  • a rotary scanning element for tracing a series of separated paths of light, and a plurality of xed reiiecting bodies inclined with respect to each other in two planes and arranged in the path of each of the separated scanning paths for so directing each successive path of light traced by the rotary scanning element as to form a plurality of parallel interspersed light paths each ci elemental width and equal in length to one dimension of the picture.
  • a rotary scanning disk for tracing a set of paths of lightacross a ⁇ plurality of adjacent parallel paths, each of elemental Width and equal in-length to one dit mension of the picture occupying the spacer between the successive pathsy normally traced by the scanning beam.
  • the method of'television scanning which includes directing light from a source in a single ⁇ beam,rdirecting the beam arcuately in sequence 2,011,271v i t 5 along a series of spaced light paths of a number materially less 'than sufficient to obtain sharp detail in image reproduction across a predetermined area, and progressively reflecting the beam in sequence along different parallel paths each equal in length to one dimension of a field of View and each of elemental Width during each arcuate motion for causingtincreased detail in image reproduction by interspersing additional light paths Within the area between initially 10 traced arcuate light paths.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Transforming Electric Information Into Light Information (AREA)
US351488A 1929-04-01 1929-04-01 Television system Expired - Lifetime US2011271A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
NL28960D NL28960C (pl) 1929-04-01
US351488A US2011271A (en) 1929-04-01 1929-04-01 Television system
GB10391/30A GB351972A (en) 1929-04-01 1930-04-01 Improvements in or relating to television and like systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US351488A US2011271A (en) 1929-04-01 1929-04-01 Television system

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US2011271A true US2011271A (en) 1935-08-13

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US351488A Expired - Lifetime US2011271A (en) 1929-04-01 1929-04-01 Television system

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GB (1) GB351972A (pl)
NL (1) NL28960C (pl)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3211046A (en) * 1962-01-04 1965-10-12 Texas Instruments Inc Split image, high scanning rate optical system with constant aperture
US3324303A (en) * 1964-08-18 1967-06-06 James C Keck High speed scanner for radiation measurements
US3544200A (en) * 1968-01-08 1970-12-01 Bell Telephone Labor Inc Cascaded light beam deflector system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3211046A (en) * 1962-01-04 1965-10-12 Texas Instruments Inc Split image, high scanning rate optical system with constant aperture
US3324303A (en) * 1964-08-18 1967-06-06 James C Keck High speed scanner for radiation measurements
US3544200A (en) * 1968-01-08 1970-12-01 Bell Telephone Labor Inc Cascaded light beam deflector system

Also Published As

Publication number Publication date
NL28960C (pl)
GB351972A (en) 1931-07-01

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