DE3227739A1 - Projection screen for photographic projectors - Google Patents

Projection screen for photographic projectors

Info

Publication number
DE3227739A1
DE3227739A1 DE19823227739 DE3227739A DE3227739A1 DE 3227739 A1 DE3227739 A1 DE 3227739A1 DE 19823227739 DE19823227739 DE 19823227739 DE 3227739 A DE3227739 A DE 3227739A DE 3227739 A1 DE3227739 A1 DE 3227739A1
Authority
DE
Germany
Prior art keywords
screen
projector
projection screen
light
projectors
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.)
Withdrawn
Application number
DE19823227739
Other languages
German (de)
Inventor
Andreas 2950 Leer Otten
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DE19823227739 priority Critical patent/DE3227739A1/en
Publication of DE3227739A1 publication Critical patent/DE3227739A1/en
Withdrawn legal-status Critical Current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
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/281—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for attenuating light intensity, e.g. comprising rotatable polarising elements
    • 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
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G03B21/60—Projection screens characterised by the nature of the surface
    • G03B21/604—Polarised screens

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Projection Apparatus (AREA)

Abstract

The light emitted from a projector is polarised and subsequently projected through a polarisation filter onto a viewing screen. It is possible in this way largely to avoid a loss of contrast due to light extraneous to the projector. <IMAGE>

Description

Bildwand für LichtbildprojektorenScreen for slide projectors

Die Erfindung betrifft eine Bildwand für Lichtbildprojektoren, die es ermöglichen soll, auch in nicht abgedunkelten Räumen klare Bilder zu projizieren.The invention relates to a screen for light image projectors that it should make it possible to project clear images even in rooms that are not darkened.

'ine normale Bildwand ist ein Stück Leinen, das auftreffendes Licht möglichst vollständi? diffus reflektiert. A normal screen is a piece of linen, the incident light as complete as possible? diffusely reflected.

wird nun das Licht eines Projektors in einen nicht abgedunkelten Raum auf eine solche Leinwand geworfen, 80 wird das Tageslicht ebenso reflektiert wie das Projektorlicht. Dadurch entsteht ein sehr hoher Kontrastverlust. the light from a projector is now turned into a non-darkened one Space thrown onto such a screen, 80 daylight is also reflected like the projector light. This results in a very high loss of contrast.

Der Erfindung liegt die Aufgabe zu Grunde, diesen Kontrastverlust zu vermeiden. The invention is based on the problem of this loss of contrast to avoid.

Diese Aufgabe ist erfindungsmäßig dadurch gelöst worden, daß das vom Projektor abgestrahlte Licht polarisiert wird und durch einen Polarisationsfilter auf eine Mattscheibe geworfen wird. This object has been achieved according to the invention in that the Light emitted by the projector is polarized and passed through a polarizing filter being thrown onto a screen.

Da das Tageslicht alle Schwingungsebenen aufweist, kann nur ein kleiner Teil des Lichtes das filter durchdringen und so einen Kontrast---erlust hervorrufen. Since daylight has all levels of vibration, only a small one can do it Part of the light penetrates the filter and thus causes a loss of contrast.

Da die Anordnurn des Projektors hinter der Bildwand sehr platzraubend ist, kann der Projektor mit einem Zusatzobjektiv versehen lcrden, welches den Abstand zur Leinwand erkürzt. Since the arrangement of the projector behind the screen takes up a lot of space the projector can be equipped with an additional lens, which determines the distance shortened to canvas.

Weiterhin ist es vorteilhaft, hinter der Bildwand ein System von Spiegeln anzuordnen, das das Bild auf die Mattscheibe wirft.It is also advantageous to have a system of mirrors behind the screen to arrange that throws the picture on the screen.

h diese Weise ist es möglich, den Projektor vor der Bildwand aufzustellen. h This way it is possible to place the projector in front of the screen.

in Ausführungsbeispiel, aus dem sich weitere erfinderische Merkmale ergeben, ist in der Zeichnung schematisch dargestellt. in exemplary embodiment from which further inventive features result is shown schematically in the drawing.

bas vom Projektor 1 abgegebene Licht 2 wird durch einen Polarisator 3 polarisiert durch ein Polarisationsfilter 4 auf eine Mattscheibe 5 geworfen. The light 2 emitted by the projector 1 is passed through a polarizer 3 polarized thrown through a polarization filter 4 onto a ground glass 5.

L e e r s e i t eL e r s e i t e

Claims (3)

Patentansprüche: 1. Bildwand für Lichtbildprojektoren, dadurch gekennzeichnet, daß das vom Projektor abgestrahlte Licht polarisiert wird und auf eine Mattscheibe geworfen wird, deren dem Projektor zugewandte Seite mit einem Polarisationsfilter überzogen ist.Claims: 1. Screen for photo projectors, characterized in that that the light emitted by the projector is polarized and on a screen is thrown, the side facing the projector with a polarizing filter is covered. 2. Bildwand nach Anspruch 1, dadurch gekennzeichnet, daß sich der Projektor vor der Bildwand befindet und das Bild von einem Spiegelsystem auf die Mattscheibe geworfen wird.2. Screen according to claim 1, characterized in that the Projector is located in front of the screen and the image from a mirror system onto the Screen is thrown. 3. Bildwand nach Anspruch 1, dadurch gekennzeichnet, daß der Projektor mit eine %usatzobjektiv ausgerüstet wird, welches eine Verkürzung des Abstandes zur Mattscheibe erlaubt.3. Screen according to claim 1, characterized in that the projector is equipped with an additional lens, which shortens the distance allowed to the ground glass.
DE19823227739 1982-07-24 1982-07-24 Projection screen for photographic projectors Withdrawn DE3227739A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19823227739 DE3227739A1 (en) 1982-07-24 1982-07-24 Projection screen for photographic projectors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19823227739 DE3227739A1 (en) 1982-07-24 1982-07-24 Projection screen for photographic projectors

Publications (1)

Publication Number Publication Date
DE3227739A1 true DE3227739A1 (en) 1984-01-26

Family

ID=6169265

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19823227739 Withdrawn DE3227739A1 (en) 1982-07-24 1982-07-24 Projection screen for photographic projectors

Country Status (1)

Country Link
DE (1) DE3227739A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0525773A2 (en) * 1991-07-31 1993-02-03 Kuraray Co., Ltd. Polarizing screen and projector using the same
EP1258747A2 (en) * 1995-04-07 2002-11-20 Honeywell Inc. High efficiency polarized display

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0525773A2 (en) * 1991-07-31 1993-02-03 Kuraray Co., Ltd. Polarizing screen and projector using the same
EP0525773A3 (en) * 1991-07-31 1993-05-05 Kuraray Co., Ltd. Polarizing screen and projector using the same
US5251065A (en) * 1991-07-31 1993-10-05 Kuraray Co., Ltd. Polarizing screen and projector using the same
EP1258747A2 (en) * 1995-04-07 2002-11-20 Honeywell Inc. High efficiency polarized display
EP1258747A3 (en) * 1995-04-07 2004-01-28 Honeywell Inc. High efficiency polarized display

Similar Documents

Publication Publication Date Title
DE69532009T2 (en) Optical system for rear projection device
DE2836184C2 (en)
DE3227739A1 (en) Projection screen for photographic projectors
DE2305752A1 (en) FINDER FOR SINGLE-EYE REFLECTIVE CAMERA WITH A DEVICE FOR REVISING EXPOSURE CONDUCTIVES
DE3525526C1 (en) Motion-picture film camera with viewing magnifier extension
DE934808C (en) Cinema equipment, in particular for arrangements for television transmission of film strips
DE69923393T2 (en) Thin illumination device for reflective display devices
DE3229997C2 (en) Device for producing photographic silhouettes with a camera
DE1219788B (en) Viewfinder for cameras with biaxial light frame reflection
DE931869C (en) Method for producing and projecting films with panoramic images and projection device for films produced by this method
DE1956654C (en) Viewfinder for a single lens reflex camera
DE938643C (en) Device for recording and reproducing stereoscopic multicolor images
DE176312C (en)
DE556676C (en) Optical system for viewfinder on cinema recording chambers
AT85301B (en) Color cinematography.
DE2002043C (en) Single-lens reflex camera with attention control display in the viewfinder
DE666871C (en) Optical system for recording or reproducing two parallax-free partial images for multicolor image projection
DE513190C (en) Playback device for quickly changing between the projection of additive color images and black-and-white images in color cinematography
DE616298C (en) Photographic camera with setting viewfinder
DE3122090A1 (en) VERSION FOR AN INVERTED GALILEO SEEKER
DE2106596A1 (en) Optical system for stereoscopy
DE667607C (en) Method for projecting stereo images
DE709530C (en) Devices on photographic recording apparatus with a finder device
DE375038C (en) Cinematograph with optical compensation through a polygonal interior mirror
AT155548B (en) Angle finders, in particular for photo or cinema cameras.

Legal Events

Date Code Title Description
8139 Disposal/non-payment of the annual fee