GB374564A - Improvements in or relating to scanning apparatus for use in television and like systems - Google Patents

Improvements in or relating to scanning apparatus for use in television and like systems

Info

Publication number
GB374564A
GB374564A GB1048731A GB1048731A GB374564A GB 374564 A GB374564 A GB 374564A GB 1048731 A GB1048731 A GB 1048731A GB 1048731 A GB1048731 A GB 1048731A GB 374564 A GB374564 A GB 374564A
Authority
GB
United Kingdom
Prior art keywords
reflectors
mirror
screen
mirrors
reflector
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
GB1048731A
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.)
Baird Television Ltd
Original Assignee
Baird Television 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 Baird Television Ltd filed Critical Baird Television Ltd
Priority to GB1048731A priority Critical patent/GB374564A/en
Publication of GB374564A publication Critical patent/GB374564A/en
Expired legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

374,564. Television. BAIRD, J. L. and BAIRD TELEVISION, Ltd., 133, Long Acre, London. April 9, 1931, No. 10487. [Class 40 (iii).] A scanning device comprises a plurality of fixed reflectors 8, 9, 10, Fig. 1, and a cooperating rotating reflector 5 whose surface is inclined to the axis of rotation 6. The reflector 5 may be replaced by a plurality of reflectors, each equally inclined to its neighbours and the axis of rotation. Light from a source 1 is directed to the rotating reflector 5 and moves across reflectors 8, 9, 10, to trace adjacent contiguous, discontiguous or overlapping lines on the screen 11. Further fixed reflectors may be placed round the shaft 6 so that the screen is scanned in overlapping or adjacent areas in horizontal and vertical lines and in opposite senses. Reflectors 12 .. 19, Fig. 2, may be used to give radial scanning lines EDC. In this case the translucency of the screen 11 may vary to compensate for uneven illumination or the coefficient of reflection may vary across the surface of the reflectors 12 .. 19. At the transmitter this compensation is unnecessary. The aperture 3 is preferably circular in this modification. In Fig. 3, each fixed reflector 21 corresponds to an elemental area of the screen 11. The mirrors 21 may be arranged so that the elemental areas, which may overlap, are illuminated in a non-sequential order. The mirror system 20 may rotate while the mirror 5 remains stationary. For flood-light scanning the source 1 is replaced by a light-sensitive cell. Several zones may be scanned by multiplication of the apparatus. According to the Provisional Specification, the mirror 5, Fig. 1, may be replaced by a mirror drum in which the mirrors are progressively canted. Where the fixed reflectors 8, 9, 10 are continued round the shaft 6, each mirror may co-operate with an inverting prism. Lenses may replace the mirrors. Specifications 222,604, 326,230, [both in Class 40 (iii), Telegraphs, Electric], and 348,211 are referred to.
GB1048731A 1931-04-09 1931-04-09 Improvements in or relating to scanning apparatus for use in television and like systems Expired GB374564A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1048731A GB374564A (en) 1931-04-09 1931-04-09 Improvements in or relating to scanning apparatus for use in television and like systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1048731A GB374564A (en) 1931-04-09 1931-04-09 Improvements in or relating to scanning apparatus for use in television and like systems

Publications (1)

Publication Number Publication Date
GB374564A true GB374564A (en) 1932-06-16

Family

ID=9968745

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1048731A Expired GB374564A (en) 1931-04-09 1931-04-09 Improvements in or relating to scanning apparatus for use in television and like systems

Country Status (1)

Country Link
GB (1) GB374564A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3718761A (en) * 1968-03-27 1973-02-27 Hughes Aircraft Co Omnidirectional planar optical code reader
EP0186920A2 (en) * 1984-12-20 1986-07-09 Magnavox Government and Industrial Electronics Company Focus-corrected convergent beam scanner
GB2207576A (en) * 1987-07-22 1989-02-01 Antony John Clynick Optical-mechanical scan rate multiplier

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3718761A (en) * 1968-03-27 1973-02-27 Hughes Aircraft Co Omnidirectional planar optical code reader
EP0186920A2 (en) * 1984-12-20 1986-07-09 Magnavox Government and Industrial Electronics Company Focus-corrected convergent beam scanner
EP0186920A3 (en) * 1984-12-20 1988-01-07 Magnavox Government And Industrial Electronics Company Focus-corrected convergent beam scanner
GB2207576A (en) * 1987-07-22 1989-02-01 Antony John Clynick Optical-mechanical scan rate multiplier

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