GB858704A - Improvements in or relating to arrangements for effecting changeovers between optical projectors - Google Patents

Improvements in or relating to arrangements for effecting changeovers between optical projectors

Info

Publication number
GB858704A
GB858704A GB17411/56A GB1741156A GB858704A GB 858704 A GB858704 A GB 858704A GB 17411/56 A GB17411/56 A GB 17411/56A GB 1741156 A GB1741156 A GB 1741156A GB 858704 A GB858704 A GB 858704A
Authority
GB
United Kingdom
Prior art keywords
projectors
light
mirror
projector
change over
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
GB17411/56A
Inventor
George Charles Newton
Frederick George Humph Elphick
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Electrical and Musical 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 EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Priority to GB17411/56A priority Critical patent/GB858704A/en
Publication of GB858704A publication Critical patent/GB858704A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Optical Filters (AREA)

Abstract

858,704. Optical-projection apparatus. ELECTRIC & MUSICAL INDUSTRIES Ltd. June 6, 1957 [June 6, 1956], No. 17411/56. Class 97(1) In an arrangement for effecting change over between two optical projectors, different colour light filters are respectively provided in the paths of light from said projectors and a dichroic mirror for reflecting one and transmitting the other of said colours is disposed in the paths of light from both of said projectors subsequently to said filters, the arrangement being such that the path of light from one of said projectors when reflected by said mirror is substantially coincident with the path of light from the other of said projectors when transmitted by said mirror, the arrangement also comprising means whereby light from each of said projectors can be prevented from reaching or allowed to reach an image-receiving surface for said projected light. The form shown comprises a projector 2 with a green filter 6, the output of which may be intercepted by a red-transmitting, green-reflecting dichroic mirror 11 and a projector 3 with a red filter 7, the output of which may be intercepted by a red-reflecting, green-transmitting dichroic mirror 10. The projector 1 has alternative filters 8 (red) and 9 (green). Both dichroic mirrors are removable. To permit change over between projectors 1 and 2 the filter 8 is inserted in projector 1 and the mirror 11 placed in position. The combined light beam is concentrated by a field lens 5 into a television camera 4. To permit change over between projectors 1 and 3 the filter 9 is inserted in projector 1 and the mirror 10 placed in position. To permit change over between projectors 2 and 3 both mirrors are placed in position. The devices for moving the filters 8 and 9 and the mirrors 10 and 11 may be coupled together. The actual change over in either case may be effected by dimmers acting on the lamps or neutral wedges or guillotine shutters acting on the light beams.
GB17411/56A 1956-06-06 1956-06-06 Improvements in or relating to arrangements for effecting changeovers between optical projectors Expired GB858704A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB17411/56A GB858704A (en) 1956-06-06 1956-06-06 Improvements in or relating to arrangements for effecting changeovers between optical projectors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB17411/56A GB858704A (en) 1956-06-06 1956-06-06 Improvements in or relating to arrangements for effecting changeovers between optical projectors

Publications (1)

Publication Number Publication Date
GB858704A true GB858704A (en) 1961-01-11

Family

ID=10094730

Family Applications (1)

Application Number Title Priority Date Filing Date
GB17411/56A Expired GB858704A (en) 1956-06-06 1956-06-06 Improvements in or relating to arrangements for effecting changeovers between optical projectors

Country Status (1)

Country Link
GB (1) GB858704A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3477782A (en) * 1967-02-21 1969-11-11 Electronic Systems Dev Inc Information display apparatus
GB2184256A (en) * 1985-10-30 1987-06-17 Telesnaps Plc Optical projection system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3477782A (en) * 1967-02-21 1969-11-11 Electronic Systems Dev Inc Information display apparatus
GB2184256A (en) * 1985-10-30 1987-06-17 Telesnaps Plc Optical projection system
GB2184256B (en) * 1985-10-30 1989-11-29 Telesnaps Plc Optical projection system

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