GB661797A - Improvements in and relating to television cameras - Google Patents

Improvements in and relating to television cameras

Info

Publication number
GB661797A
GB661797A GB12331/49A GB1233149A GB661797A GB 661797 A GB661797 A GB 661797A GB 12331/49 A GB12331/49 A GB 12331/49A GB 1233149 A GB1233149 A GB 1233149A GB 661797 A GB661797 A GB 661797A
Authority
GB
United Kingdom
Prior art keywords
reflector
cathode
image
light
dechroic
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
GB12331/49A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston 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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB661797A publication Critical patent/GB661797A/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
    • G02B27/141—Beam splitting or combining systems operating by reflection only using dichroic mirrors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Viewfinders (AREA)

Abstract

661,797. Television transmitters. BRITISH THOMSON-HOUSTON CO., Ltd. May 9, 1949 [May 11, 1948], No. 12331/49. Class 40 (iii). A view-finder for use with an image-orthicon television transmitting tube comprises a partially-reflecting, partially light-transmitting device 7 which splits the beam focused by the objective lens 6, so that the transmitted light forms an image on the photo-cathode 12 while the reflected light produces an image on the ground-glass screen 20. The device 7 may be a half-silvered mirror having achromatic properties or it may be a dechroic reflector comprising a thin transparent film deposited on a transparent surface. In an arrangement employing a dechroic reflector the transmitted light may be arranged to compensate for divergences in the colour characteristic of the cathode 12 from that of the eye. Alternatively, the reflector may reflect only light of the colours to which the photo-cathode is insensitive, thereby effecting a worsening of the colour characteristic of the tube, but providing a more sensitive arrangement. As the same objective lens is used for both optical systems, simultaneous focusing of the two images by a single control may be effected.
GB12331/49A 1948-05-11 1949-05-09 Improvements in and relating to television cameras Expired GB661797A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US661797XA 1948-05-11 1948-05-11

Publications (1)

Publication Number Publication Date
GB661797A true GB661797A (en) 1951-11-28

Family

ID=22067767

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12331/49A Expired GB661797A (en) 1948-05-11 1949-05-09 Improvements in and relating to television cameras

Country Status (3)

Country Link
BE (1) BE488963A (en)
FR (1) FR985758A (en)
GB (1) GB661797A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2458188A1 (en) * 1979-05-29 1980-12-26 Victor Company Of Japan VIEWFINDER FOR TELEVISION CAMERA

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2709391A (en) * 1953-06-29 1955-05-31 Nichols Robert Gordon Motion picture camera with two view finders

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2458188A1 (en) * 1979-05-29 1980-12-26 Victor Company Of Japan VIEWFINDER FOR TELEVISION CAMERA

Also Published As

Publication number Publication date
FR985758A (en) 1951-07-23
BE488963A (en)

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