GB691898A - Projection display apparatus - Google Patents

Projection display apparatus

Info

Publication number
GB691898A
GB691898A GB2522451A GB2522451A GB691898A GB 691898 A GB691898 A GB 691898A GB 2522451 A GB2522451 A GB 2522451A GB 2522451 A GB2522451 A GB 2522451A GB 691898 A GB691898 A GB 691898A
Authority
GB
United Kingdom
Prior art keywords
disc
screen
lens
arrow head
colour filter
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
GB2522451A
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.)
Federal Telecommunication Laboratories Inc
Original Assignee
Federal Telecommunication Laboratories Inc
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 Federal Telecommunication Laboratories Inc filed Critical Federal Telecommunication Laboratories Inc
Priority to GB2522451A priority Critical patent/GB691898A/en
Publication of GB691898A publication Critical patent/GB691898A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
    • G01C21/20—Instruments for performing navigational calculations
    • G01C21/22—Plotting boards

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Automation & Control Theory (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Instrument Panels (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Abstract

691,898. Optical pointers. STANDARD TELEPHONES & CABLES, Ltd. (Federal Telecommunication Laboratories). Oct. 29, 1951, No. 25224/51. Class' 97 (i). [Also in Group XXXVIII] An air traffic supervision system (see Group XXXVIII), comprises means for controlling the movement of a projected image on a screen in first and second orthogonal co-ordinates. Light from a source 132 is condensed by a lens 133 on to a disc 50 through one of a series of colour filters 134 mounted on a wheel 135 and selected by rotation of a knob 136. Each colour filter 134 is inscribed with a code and identifies an aircraft and its altitude. The disc 50 has a cut-out central portion and an arrow head, and is rotatable by a Selsyn motor 53 such that the arrow head may indicate the direction of flight. An image of the disc 50 and colour filter 134 is projected by a lens 137 on to a screen 1 after reflection at mirrors 30 and 36 pivoted to provide horizontal and vertical deflections of the beam under the control of servo motors 24 and 25. Compensating linkages 29 and 35 correct for distortion of co-ordinate values due to the finite spacing of projector and screen.
GB2522451A 1951-10-29 1951-10-29 Projection display apparatus Expired GB691898A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2522451A GB691898A (en) 1951-10-29 1951-10-29 Projection display apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2522451A GB691898A (en) 1951-10-29 1951-10-29 Projection display apparatus

Publications (1)

Publication Number Publication Date
GB691898A true GB691898A (en) 1953-05-20

Family

ID=10224226

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2522451A Expired GB691898A (en) 1951-10-29 1951-10-29 Projection display apparatus

Country Status (1)

Country Link
GB (1) GB691898A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3205765A (en) * 1961-04-20 1965-09-14 Zoltai John Schematic diagram composing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3205765A (en) * 1961-04-20 1965-09-14 Zoltai John Schematic diagram composing

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