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GB680318A - Improvements in television receivers - Google Patents

Improvements in television receivers

Info

Publication number
GB680318A
GB680318A GB23212/50A GB2321250A GB680318A GB 680318 A GB680318 A GB 680318A GB 23212/50 A GB23212/50 A GB 23212/50A GB 2321250 A GB2321250 A GB 2321250A GB 680318 A GB680318 A GB 680318A
Authority
GB
United Kingdom
Prior art keywords
screen
image
mirror
schmidt
spherical mirror
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
GB23212/50A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries 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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB680318A publication Critical patent/GB680318A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B17/00—Systems with reflecting surfaces, with or without refracting elements
    • G02B17/08—Catadioptric systems
    • G02B17/0896—Catadioptric systems with variable magnification or multiple imaging planes, including multispectral systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B17/00—Systems with reflecting surfaces, with or without refracting elements
    • G02B17/08—Catadioptric systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B17/00—Systems with reflecting surfaces, with or without refracting elements
    • G02B17/08—Catadioptric systems
    • G02B17/0884—Catadioptric systems having a pupil corrector
    • G02B17/0888—Catadioptric systems having a pupil corrector the corrector having at least one aspheric surface, e.g. Schmidt plates
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Abstract

680,318. Optical-projection systems. PHILIPS ELECTRICAL INDUSTRIES, Ltd. Sept. 21, 1950 [Sept. 21, 1949], No. 23212/50. Class 97 (i). [Also in Group XL (b)] A Schmidt optical system for projecting a television image on to a screen is associated with a further projection system comprising a lens mounted in an aperture in the centre of the spherical mirror of the Schmidt system for projecting the television image on to a further screen. By this means the light which would otherwise fall on to the central portion of the spherical mirror of the Schmidt system and would thus not be used in forming the final image, is utilized to produce a further image, thereby increasing the possible number of viewers. An image of the picture on the screen of the cathode-ray tube 1 is produced on the screen 5 by means of spherical mirror 3, plane mirror 7 and corrector plate 4, as described in Specification 548,750. A further image is produced on the screen 10 by means of the lens 9 which is supported by a holder 11 fitted into an aperture provided centrally in the mirror 3. The receiver and screens 5 and 10, which are arranged to be mutually perpendicular, are housed within a cabinet 12. An alternative embodiment, Fig. 1 (not shown), comprises a similar optical system with the mirror 7 omitted so that the screens 5 and 10 are arranged parallel to one another.
GB23212/50A 1949-09-21 1950-09-21 Improvements in television receivers Expired GB680318A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR680318X 1949-09-21

Publications (1)

Publication Number Publication Date
GB680318A true GB680318A (en) 1952-10-01

Family

ID=9022184

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23212/50A Expired GB680318A (en) 1949-09-21 1950-09-21 Improvements in television receivers

Country Status (1)

Country Link
GB (1) GB680318A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1029411B (en) * 1954-11-12 1958-05-08 Thorn Electrical Ind Ltd Projection display device for color television signals
GB2165960A (en) * 1984-10-22 1986-04-23 Gen Electric Light collection systems

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1029411B (en) * 1954-11-12 1958-05-08 Thorn Electrical Ind Ltd Projection display device for color television signals
GB2165960A (en) * 1984-10-22 1986-04-23 Gen Electric Light collection systems

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