US1740490A - Picture telegraphy - Google Patents

Picture telegraphy Download PDF

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Publication number
US1740490A
US1740490A US183631A US18363127A US1740490A US 1740490 A US1740490 A US 1740490A US 183631 A US183631 A US 183631A US 18363127 A US18363127 A US 18363127A US 1740490 A US1740490 A US 1740490A
Authority
US
United States
Prior art keywords
light
picture
message
message form
lens
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
US183631A
Other languages
English (en)
Inventor
Wright George Maurice
Smith Sidney Bertram
Davis Norman Eustace
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
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 RCA Corp filed Critical RCA Corp
Application granted granted Critical
Publication of US1740490A publication Critical patent/US1740490A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/06—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using cylindrical picture-bearing surfaces, i.e. scanning a main-scanning line substantially perpendicular to the axis and lying in a curved cylindrical surface
    • H04N1/0607—Scanning a concave surface, e.g. with internal drum type scanners
    • H04N1/0621—Scanning a concave surface, e.g. with internal drum type scanners using a picture-bearing surface stationary in the main-scanning direction
    • H04N1/0635—Scanning a concave surface, e.g. with internal drum type scanners using a picture-bearing surface stationary in the main-scanning direction using oscillating or rotating mirrors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/06—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using cylindrical picture-bearing surfaces, i.e. scanning a main-scanning line substantially perpendicular to the axis and lying in a curved cylindrical surface
    • H04N1/0607—Scanning a concave surface, e.g. with internal drum type scanners

Definitions

  • This invention relates to picture telegraphy, and more particularly to what is someor picture while the message form itself is stationary or moving only slowly. lt will be seen that the positioning of a message form 'upon a rapidly moving part of the apparatus is likely to involve considerable dimculty, while if the apparatus has to be stopped, for the message form to be placed in position, delay will result.
  • the. apparatus includes a source of light and a photo-electric cell or the like (as apparatus for picture telegraphy almost in.
  • apparatus for the telegraphic transmission and reception of pictures or the like comprises a stationary source of light, an optical system for projecting a point of light upon a message form or upon a message receiving device, and means for moving the optical system, whereby the point of light is caused to move over substantially the whole surface of the message form or message receiving device.
  • rial such as glass.
  • 'lhe lens 8 through which the light reflected from the image point passes, is concentric with and llarger than the focussing lens 4, the latterl being arrangedina protecting tube 10 passing through the former and embracing the prism so that there is no interference between the outgoing and the reflected light.
  • 11 is a mirror for collecting the refiected light reflected from the form or device 6. It will be seen vthat the light reflected from the .message form will vary in intensity and strength with the message inscribed upon the said form, since the amount of reflected light will vary with the degree of light and shade of the message upon the said message form.
  • the tube is oscillated or rotated, while the message carrier is progressively advanced in an axial direction.
  • gression between the tube and the message carrier comprises a clutching device, whereby the said mechanism may be disengaged while the message form is placed in position.
  • the lens 8 through which the reflected light passes is located further along the tube than the focussing lens 4, there being provided a spherical mirror 11 whose centre is the focus point, the said mirror serving to collect the reiected light for projectio through the said lens 8.
  • the arrangements 'hereinbefore described may be rendered suitable for the reception of picture telegraphy by substituting for the message form and associated optical system for collecting the reflected light, a Kerr cell or other light modulating device, and a light sensitive receiving surface.
  • the light from the arc lamp or other source is modulated by the Kerr cell and focussed by the prism and lens upon the sensitive receiving surface.
  • the motion of the message form 6 is continuous and is derived as above stated from the rotation of the motor 12 so that as .the light system is rotated from the worm connection 19, new portions of the picture to be transmitted will be placed continuously above the slotted p0rtion 30 of the message form 6 so as to enable the light beam entering the reflecting lens system 20 from a point to the right of 2O (looking at Fig. 4) to scan all portions of lthe picture carried by the message form.
  • Fig. 3 there is a large bracket arm 31 carried from a pivotal mounting 32.
  • bracket arm or yoke 31 is preferably provided With any suitable form of belt of a desired Width for holding the message tight Vagainst the message form 6, and the pivotal connection provides means whereby the bracket arm can hold the picture surface tight against the message form and yet an arrangement which can be quickly released upon beingA moved in a counter-clockwise direction (looking at Fig. 3) about 32 as a pivot and thus quickly release the picture from the message form.
  • Fig. 4 is shown in opposite relationship to the showing of Fig. 2 and that if Fig ⁇ 2 is turned end for end so that the light directed from the lens 4 can be assumed to direct itself toward the bottom of the page instead of toward the top of the page, as shown, the analogy between Figs. 2 and 4 Willbe at once apparent and it will be seen that the photocell to which the reflected light from the reecting system 21 is directed will be placed at the left end of the light tube 2 vof Fig. 4.
  • means are provided for adjusting the phase of the receiving device so that should the streak of light referred to in the last paragraph not fall in the correct plane on the mes-v sage form, adjustments may be made.
  • This may be effectedv by rotatably mounting the driving means, for example, a synchronous motor, in trunnions or the like and rotating the whole machine by means of suitable gearing, thereby advancing .or retarding the armature.
  • This adjustment may be effected either by hand or automatically.
  • the message form or receiving surface does not occupy the whole cylindrical circumference of the message carrier (tube 7 in the figures), but embraces only an arc thereof.
  • a plurality of such message forms may be employed so that between them they occupy substantially the whole cylindrical circumference, and a corresponding plurality of machines be provided ⁇ the said machines being mechanically' or electrically geared together and the arrangement being such that the several spots of light traverse their respective arcs successively,
  • 12 is a driving motor which is mounted upon a pedestal 13 and whose carcase may be rotated by means of a handle 14 driving a transmitted, a stationar 'entitled to all modifications that fall fairly Within its scope as defined by the following claims, wherein We claim:
  • a picture transmission system a stationary source of light, a message form for supporting the picture to be transmitted, optical means or projecting the light from said source to a point on said supported picture, means for mounting said optical means within said message form, means for causing said projected light to traverse the entire message form, and means for collecting.
  • a message form adapted to support a picture
  • a stationary source of light means for directing said light Within said message form, optical means for projecting a point of said light upon said message form, said means comprising a reecting prism and a lens, a second lens concentric with said lirst named lens, said second lens being adapted to direct reflected light from said message form, and electrical means controlled by said relected light for varying the strengthV of an electric current in proportion to the pigmentation of the picture upon said message form.
  • a stationary source of light a message form for supporting a picture to be transmitted, optical ineans for projecting the light from said source to a point on said supported picture, means for rotating said optical means within said message form, means for causing said projected light to traverse the entire.
  • a picture transmission system a stationary source of light, a messagelform for supporting a picture to be transmitted, op tical means carried within said message form for projecting light against said message form, means for causing said projected lightv to trace successive paths transverse et said message form, means for advancing said message form with respect to said projected light whereby each successive path of projected light covers a di'erent portion ot the picture carried b said message form and means for collectmg the light redected from said message form.
  • a picture transmitting apparatus in cludinga member adapted to support a pic ture bearing sheet, a rotatable member, means mountedon said member for projecting light upon said sheet, and means for re ⁇ 1 ceiving and directing the light reected from said sheet along apredetermined path.
  • a picture transmitting apparatus inn cluding means for supporting a picture bearing sheet, a ⁇ rotatable member, a lens mounted on said member for projecting light upon said sheet, a lens mounted on said member tor receiving the light reected from said sheet, and means mounted on said member for changing the direction or the light redected through said lens.
  • a picture transmitting apparatus im cluding a stationary support, a hollow shaft, means mounted on said shaft for projecting light toward said support and tor receiving the light redected away from said support and means arranged to direct said reflected light through said hollow shaft.
  • A. picture transmitting apparatus including a support, a hollow rotatable shaft, a lens mounted on said shaft tor projecting light toward said support, a lens on said shaft for receiving the light relected away ne Y on said member for projecting light toward l said picture bearing sheet and for receiving the light reflected away from said sheet, and

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Mechanical Light Control Or Optical Switches (AREA)
  • Optical Communication System (AREA)
  • Mechanical Optical Scanning Systems (AREA)
US183631A 1926-04-21 1927-04-14 Picture telegraphy Expired - Lifetime US1740490A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB10557/26A GB276399A (en) 1926-04-21 1926-04-21 Improvements in or relating to picture telegraphy and the like

Publications (1)

Publication Number Publication Date
US1740490A true US1740490A (en) 1929-12-24

Family

ID=9970030

Family Applications (1)

Application Number Title Priority Date Filing Date
US183631A Expired - Lifetime US1740490A (en) 1926-04-21 1927-04-14 Picture telegraphy

Country Status (5)

Country Link
US (1) US1740490A (fr)
BE (1) BE341615A (fr)
DE (1) DE535262C (fr)
FR (1) FR634793A (fr)
GB (1) GB276399A (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2532799A (en) * 1944-08-01 1950-12-05 Rca Corp Facsimile system having rotating scanner moving longitudinally within stationary transparent drum
US2989586A (en) * 1956-07-09 1961-06-20 Honeywell Regulator Co Facsimile systems
US4107740A (en) * 1974-06-14 1978-08-15 Cooley Austin G Optical scanning system utilizing an oscillating lens and mirror
WO1981000320A1 (fr) * 1979-07-11 1981-02-05 L Buechler Appareil de gravure ayant des caracteristiques ameliorees de frequence et d'exploration
EP0023962B1 (fr) * 1979-08-13 1983-04-06 International Business Machines Corporation Système de balayage de documents
US9561508B2 (en) 2010-06-24 2017-02-07 Metso Brasil Industria E Comercio Ltda Roller for high pressure roller grinder, roller grinder, and method for assembling a roller for a roller grinder

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1904340C3 (de) * 1968-02-05 1974-08-22 Xerox Corp., Rochester, N.Y. (V.St.A.) Optische Abtastvorrichtung für die Faksimile-Nachrichtenübertragung

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2532799A (en) * 1944-08-01 1950-12-05 Rca Corp Facsimile system having rotating scanner moving longitudinally within stationary transparent drum
US2989586A (en) * 1956-07-09 1961-06-20 Honeywell Regulator Co Facsimile systems
US4107740A (en) * 1974-06-14 1978-08-15 Cooley Austin G Optical scanning system utilizing an oscillating lens and mirror
WO1981000320A1 (fr) * 1979-07-11 1981-02-05 L Buechler Appareil de gravure ayant des caracteristiques ameliorees de frequence et d'exploration
EP0023962B1 (fr) * 1979-08-13 1983-04-06 International Business Machines Corporation Système de balayage de documents
US9561508B2 (en) 2010-06-24 2017-02-07 Metso Brasil Industria E Comercio Ltda Roller for high pressure roller grinder, roller grinder, and method for assembling a roller for a roller grinder

Also Published As

Publication number Publication date
BE341615A (fr)
DE535262C (de) 1931-10-08
FR634793A (fr) 1928-02-25
GB276399A (en) 1927-08-22

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