GB756954A - Improvements in optical scanning arrangements for facsimile and picture telegraph transmitters - Google Patents

Improvements in optical scanning arrangements for facsimile and picture telegraph transmitters

Info

Publication number
GB756954A
GB756954A GB2584253A GB2584253A GB756954A GB 756954 A GB756954 A GB 756954A GB 2584253 A GB2584253 A GB 2584253A GB 2584253 A GB2584253 A GB 2584253A GB 756954 A GB756954 A GB 756954A
Authority
GB
United Kingdom
Prior art keywords
objective
light
mirror
scanned
arrangement
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
Application number
GB2584253A
Inventor
John Bell
Alan Arthur Kirchel
Maurice Sidney Pembroke
Peter William Sieber
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.)
Muirhead and Co Ltd
Original Assignee
Muirhead and Co Ltd
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 Muirhead and Co Ltd filed Critical Muirhead and Co Ltd
Priority to GB2584253A priority Critical patent/GB756954A/en
Priority to DEM24518A priority patent/DE1011917B/en
Priority to FR1111622D priority patent/FR1111622A/en
Publication of GB756954A publication Critical patent/GB756954A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/14—Beam splitting or combining systems operating by reflection only
    • G02B27/144—Beam splitting or combining systems operating by reflection only using partially transparent surfaces without spectral selectivity
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/14—Beam splitting or combining systems operating by reflection only
    • G02B27/143—Beam splitting or combining systems operating by reflection only using macroscopically faceted or segmented reflective surfaces
    • 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
    • H04N1/024—Details of scanning heads ; Means for illuminating the original
    • H04N1/028—Details of scanning heads ; Means for illuminating the original for picture information pick-up
    • H04N1/029—Heads optically focused on only one picture element at a time

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

756,954. Copying telegraphy. MUIRHEAD & CO., Ltd. Sept. 17, 1954 [Sept. 18, 1953], No. 25842/53. Class 40 (3). An optical scanning arrangement for a copying telegraph transmitter is arranged with the optical axes of the illumination and light-collecting systems coincident and inclined to the surface to be scanned at an angle sufficient to ensure that no light reflected directly from the surface (as occurs, for example, with a glossy finished photograph) can enter the collecting system. The magnitude of the signal produced by the system is then a true measure of the optical tone or density of the surface scanned. In one arrangement, Fig. 1, the lamp 1 reflects light to the surface 5 being scanned by. way of an inclined mirror 3 and objective 4, the same objective serving to form an image of the surface on a light-sensitive device 7 by way of a central circular or elliptical aperture in mirror 3. Surface 5 is set at angle to the normal AA which exceeds half the inclined angle of the collecting cone of the objective. In a modified arrangement, Fig. 2 (not shown), the apertured mirror is replaced by a plane glass or half-silvered mirror. In a further modification, Fig. 3 (not shown), a pair of contacting prisms are utilized with the contacting face of one ground or sand-blasted away to leave only a central circular or elliptical part in optical contact with the face of the other. To reduce the light entering the collecting system due to reflection from upper surface of objective, this surface is preferably " bloomed ". In another arrangement, Fig. 4 (not shown), the illuminating beam of light is arranged not to pass through the objective 4 by disposing the reflecting half silvered mirror or glass plate between the objective and surface 5.
GB2584253A 1953-09-18 1953-09-18 Improvements in optical scanning arrangements for facsimile and picture telegraph transmitters Expired GB756954A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB2584253A GB756954A (en) 1953-09-18 1953-09-18 Improvements in optical scanning arrangements for facsimile and picture telegraph transmitters
DEM24518A DE1011917B (en) 1953-09-18 1954-09-16 Optical-electrical scanning device for image transmitter
FR1111622D FR1111622A (en) 1953-09-18 1954-09-17 Improvements in optical scanning arrangements for telegraphic facsimile and image transmitters

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2584253A GB756954A (en) 1953-09-18 1953-09-18 Improvements in optical scanning arrangements for facsimile and picture telegraph transmitters

Publications (1)

Publication Number Publication Date
GB756954A true GB756954A (en) 1956-09-12

Family

ID=10234234

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2584253A Expired GB756954A (en) 1953-09-18 1953-09-18 Improvements in optical scanning arrangements for facsimile and picture telegraph transmitters

Country Status (3)

Country Link
DE (1) DE1011917B (en)
FR (1) FR1111622A (en)
GB (1) GB756954A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49106713A (en) * 1973-02-10 1974-10-09

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB948980A (en) * 1961-12-20 1964-02-05 Solartron Electronic Group Improvements relating to mechanical linkages to electro-magnets
JP3045629B2 (en) * 1993-02-17 2000-05-29 三菱電機株式会社 Uneven pattern detector

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE503150C (en) * 1927-04-13 1931-08-26 Franz Wrede Dr Recording device for photoelectric image transmission
DE539253C (en) * 1927-06-04 1931-11-24 Lorenz Akt Ges C Device for image scanning for remote image transmission
US2262584A (en) * 1940-05-22 1941-11-11 Bell Telephone Labor Inc Scanning apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49106713A (en) * 1973-02-10 1974-10-09

Also Published As

Publication number Publication date
FR1111622A (en) 1956-03-02
DE1011917B (en) 1957-07-11

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