US2227010A - Television scanning means - Google Patents

Television scanning means Download PDF

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Publication number
US2227010A
US2227010A US94129A US9412936A US2227010A US 2227010 A US2227010 A US 2227010A US 94129 A US94129 A US 94129A US 9412936 A US9412936 A US 9412936A US 2227010 A US2227010 A US 2227010A
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US
United States
Prior art keywords
image
disc
spiral
edge
scanning
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
Application number
US94129A
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English (en)
Inventor
Schlesinger Kurt
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.)
LOEWE RADIO Inc
Original Assignee
LOEWE RADIO Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by LOEWE RADIO Inc filed Critical LOEWE RADIO Inc
Application granted granted Critical
Publication of US2227010A publication Critical patent/US2227010A/en
Anticipated expiration legal-status Critical
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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
    • H04N3/04—Scanning details of television systems; Combination thereof with generation of supply voltages by optical-mechanical means only having a moving aperture also apertures covered by lenses

Definitions

  • Fig. 1 shows an example of a distorted image projection.
  • Fig. 2 the bad result in the received picture which is due to this distortion in the projection to the Nipkow disc
  • Figs. 3 and 4 show exemplary embodiments in schematic form with which remedy may be obtained.
  • the trapezoidal sectional area of the scanning spiral 5 is represented by the. four corners l 2, 3, 4.
  • This spiral is shown as a double spiral; the idea, however, may also be extended to discs having a greater number of spirals. It is assumed that the light image projected on to the disc, due to a slight error in the optical adjustment, is not exactly congruent with the sectional trapezium, but differs from the same as shown by the lines I, 2', 3', 4. This light image is indicated by shading. If an image of this nature is transmitted by the disc 5 and is composed at the receiver in such fashion that the sectional area A is disposed over the sectional area B, there is obtained a received image according to Fig.
  • the fundamental idea of the invention consists in chronologically correcting in such fashion by the transmitter the initiation of the impulses which determine the commencement of a new line at the receiver that the images A and B coincide. This may be performed in its most simple form by proceeding according to the method making use of self-synchronising image points.
  • the image points traverse either a particularly bright or a particularly dark edge of the image. If it is desired to correct the periods of initiation in the case of the sectional areas A and B independently of each other, there is employed for this purpose in accordance with the invention a divided marginal line.
  • Two steel knife edges according to Fig. 3 which are freelymovable in relation to one another and of which each is half the height of the image, are applied by optical reproduction at the transmission end to the edge of the image.
  • the meeting point between the two knife edges passes through the centre of the image.
  • the middle line passes through the point 8 and agrees in length with the section are of the disc.
  • An image point which moves over the surface from the left to the right supplies a synchronising signal after leaving the edge 6 or 1 of the upper or lower knife edge.
  • FIG. 4 shows still further the manner in.
  • Fig. 4 of the drawings 5 represents, as in Fig. l, the Nipkow disc having a spiral of two turns of apertures I and 2., The arrow indicates the direction of rotation of the disc and accordingly the projection of the image moves upward.
  • the part image areas belonging to the two separate spiral turns are designated B and A as in Fig. 1 and such image areas may be rectangular or trapezoidal.
  • the designation ll represents, as also does the legend, the radial light margin causing the synchronization signals.
  • the left edge margin of the field is defined by two diaphragm elements 6 and I which may be adjusted separately and tangentially to the spiral turns.
  • the position of the two diaphragms 6 and I is drawn for rectangular image areas. In the case of trapezoidal areas the inner edges of the diaphragm should be positioned radially. 10
  • a scanning disc having positioned thereon a plurality of elemental scanning openings arranged about the outer area of the disc in spiral forma- 15 tion to form two complete spiral turns, each of said spiral turns having a pitch substantially equal to the height of an image area to be scanned and the separation of the individual elemental scanning openings on each spiral having 20 substantially an equal angular spacing one from the other and a linear spacing along the spiral path varying in accordance with the radial spacing from the disc center, so that an image pattern of predetermined configuration is scanned, said disc being adapted to be illuminated with a band of light of substantially fixed intensity along a strip adjacent a radial edge of the said image pattern area, the combination of two light masking elements each having one edge coincide with a radial edge of the pattern scanned by the disc and located in the path of the fixed intensity light, and each masking element being associated with one of the spiral paths only and adapted to be moved tangentially relatively to its associated spiral path to vary thereby the radial position at which

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Transforming Electric Information Into Light Information (AREA)
US94129A 1935-08-06 1936-08-04 Television scanning means Expired - Lifetime US2227010A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2227010X 1935-08-06

Publications (1)

Publication Number Publication Date
US2227010A true US2227010A (en) 1940-12-31

Family

ID=7991157

Family Applications (1)

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US94129A Expired - Lifetime US2227010A (en) 1935-08-06 1936-08-04 Television scanning means

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US (1) US2227010A (en(2012))
BE (1) BE416844A (en(2012))

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Publication number Publication date
BE416844A (en(2012))

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