DE20200607U1 - Back projection unit has projector and transparent screen having mirror chain reflecting light from the projector through a gap behind the screen and at an acute angle to the transparent screen - Google Patents

Back projection unit has projector and transparent screen having mirror chain reflecting light from the projector through a gap behind the screen and at an acute angle to the transparent screen

Info

Publication number
DE20200607U1
DE20200607U1 DE20200607U DE20200607U DE20200607U1 DE 20200607 U1 DE20200607 U1 DE 20200607U1 DE 20200607 U DE20200607 U DE 20200607U DE 20200607 U DE20200607 U DE 20200607U DE 20200607 U1 DE20200607 U1 DE 20200607U1
Authority
DE
Germany
Prior art keywords
projector
mirror
screen
projection device
rear projection
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 - Lifetime
Application number
DE20200607U
Other languages
German (de)
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.)
EXACT PLANWERK GmbH
Original Assignee
EXACT PLANWERK GmbH
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 EXACT PLANWERK GmbH filed Critical EXACT PLANWERK GmbH
Priority to DE20200607U priority Critical patent/DE20200607U1/en
Publication of DE20200607U1 publication Critical patent/DE20200607U1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • G03B21/10—Projectors with built-in or built-on screen

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Projection Apparatus (AREA)

Abstract

A back projection unit has a projector (15) and transparent screen (13) has a mirror chain (21, 22, 23) reflecting light (27) from the projector (15) through a gap (24) behind the screen and at an acute angle to the transparent screen (13) then up and onto it.

Description

Der Beschreibungstext wurde nicht elektronisch erfaßt The description text was not recorded electronically  

Der Beschreibungstext wurde nicht elektronisch erfaßt The description text was not recorded electronically  

Der Beschreibungstext wurde nicht elektronisch erfaßt The description text was not recorded electronically  

Der Beschreibungstext wurde nicht elektronisch erfaßt The description text was not recorded electronically  

Der Beschreibungstext wurde nicht elektronisch erfaßt The description text was not recorded electronically  

Der Beschreibungstext wurde nicht elektronisch erfaßt The description text was not recorded electronically  

Der Beschreibungstext wurde nicht elektronisch erfaßt The description text was not recorded electronically  

Der Beschreibungstext wurde nicht elektronisch erfaßtThe description text was not recorded electronically

Claims (11)

1. Rückprojektionseinrichtung mit einem Projektor (15), einem lichtdurchlässigen Projektionsschirm (13), einem ersten Spiegel (21), der ein vom Projektor kommendes Strahlenbündel (27) auf den Projektionsschirm (13) lenkt, einem zweiten Spiegel (22), der das Strahlenbündel auf den ersten Spiegel (21) lenkt, wobei der zweite Spiegel (22) annähernd rechtwinkelig zum Projektionsschirm (13) nahe von deren einem Rand (29) verläuft und wobei der dem einen Rand (29) gegenüberliegende zweite Rand (25) zusam­ men mit dem ersten Spiegel (21) einen Spalt (24) bildet, durch den das vom Projektor (15) kommende Strahlenbündel (27) derart gerichtet hindurch geht, dass sein dem Pro­ jektionsschirm (13) nächstliegender Randstrahl (27a) an­ nähernd parallel zu dem Projektionsschirm (13) verläuft.1. rear projection device with a projector ( 15 ), a translucent projection screen ( 13 ), a first mirror ( 21 ) which directs a beam of rays coming from the projector ( 27 ) onto the projection screen ( 13 ), a second mirror ( 22 ) which radiation beam deflected at the first mirror (21), said second mirror (22) extends approximately perpendicular to the projection screen (13) near of the one edge (29) and wherein the said measures an edge (29) opposite second edge (25) together forms with the first mirror (21) has a gap (24), directed by the projector (15) coming beams (27) in such a way passes that be the Pro jektionsschirm (13) closest edge beam (27 a) of approaching parallel to the projection screen ( 13 ) runs. 2. Rückprojektionseinrichtung nach Anspruch 1, dadurch ge­ kennzeichnet, dass der Abstand zwischen dem Randstrahl (27a) und dem Projektionsschirm (13) sich im Verlauf des Strahlenweges zunehmend vergrößert.2. rear projection device according to claim 1, characterized in that the distance between the edge beam ( 27 a) and the projection screen ( 13 ) increases progressively in the course of the beam path. 3. Rückprojektionseinrichtung nach Anspruch 1 oder 2, da­ durch gekennzeichnet, dass ein Gehäuse oder Rahmengestell (10; 10a) vorgesehen ist, in dem der erste und der zweite Spiegel (21, 22) montiert sind und das durch den Projektionsschirm (13) abgeschlossen ist.3. rear projection device according to claim 1 or 2, characterized in that a housing or frame ( 10 ; 10 a) is provided, in which the first and second mirrors ( 21 , 22 ) are mounted and that through the projection screen ( 13 ) is completed. 4. Rückprojektionseinrichtung nach Anspruch 3, dadurch ge­ kennzeichnet, dass das Gehäuse (10) den Projektor (15) wenigstens teilweise einschließt. 4. rear projection device according to claim 3, characterized in that the housing ( 10 ) at least partially includes the projector ( 15 ). 5. Rückprojektionseinrichtung nach Anspruch 3, dadurch ge­ kennzeichnet, dass der Projektor (15) außerhalb des Ge­ häuses (10a) auswechselbar angeordnet ist.5. rear projection device according to claim 3, characterized in that the projector ( 15 ) outside of the Ge housing ( 10 a) is arranged exchangeably. 6. Rückprojektionseinrichtung nach einem der Ansprüche 1-5, dadurch gekennzeichnet, dass ein dritter Spiegel (23) zwischen dem Projektor (10) und dem zweiten Spiegel (22) oberhalb des Projektionsschirms (13) angeordnet ist, wo­ bei der dritte Spiegel (23) die Strahlung des horizontal ausgerichteten Projektors (15) durch den Spalt (24) lei­ tet.6. Rear projection device according to one of claims 1-5, characterized in that a third mirror ( 23 ) is arranged between the projector ( 10 ) and the second mirror ( 22 ) above the projection screen ( 13 ), where the third mirror ( 23 ) the radiation from the horizontally oriented projector ( 15 ) through the gap ( 24 ) leads. 7. Rückprojektionseinrichtung nach einem der Ansprüche 1-6, dadurch gekennzeichnet, dass der Projektor (15) senkrecht über dem ersten Spiegel (21) mit senkrecht zum Projekti­ onsschirm (13) verlaufender geometrischer Ausrichtung angeordnet ist.7. Rear projection device according to one of claims 1-6, characterized in that the projector ( 15 ) is arranged perpendicularly above the first mirror ( 21 ) with a perpendicular to the projection screen ( 13 ) running geometric orientation. 8. Rückprojektionseinrichtung nach einem der Ansprüche 1-7, dadurch gekennzeichnet, dass der Projektor (15) einen von Null verschiedenen Abstrahlwinkel hat.8. rear projection device according to one of claims 1-7, characterized in that the projector ( 15 ) has a non-zero radiation angle. 9. Rückprojektionseinrichtung nach einem der Ansprüche 1-8, dadurch gekennzeichnet, dass das Objektiv des Projektors (15) ein Verhältnis Projektionsabstand. Bildhöhe von 2,0 : 1 bis 3,0 : 1 hat.9. rear projection device according to one of claims 1-8, characterized in that the lens of the projector ( 15 ) has a ratio projection distance. Image height from 2.0: 1 to 3.0: 1. 10. Rückprojektionseinrichtung nach einem der Ansprüche 1-9, dadurch gekennzeichnet, dass die Breite des Spalts (24) kleiner ist als die Länge des zweiten Spiegels (22), ins­ besondere kleiner als ein Drittel der Länge des zweiten Spiegels. 10. rear projection device according to one of claims 1-9, characterized in that the width of the gap ( 24 ) is smaller than the length of the second mirror ( 22 ), in particular less than a third of the length of the second mirror. 11. Rückprojektionseinrichtung nach einem der Ansprüche 1-10, dadurch gekennzeichnet, dass der Projektionsschirm (13) transparent und lichtbeugend ist.11. Rear projection device according to one of claims 1-10, characterized in that the projection screen ( 13 ) is transparent and diffractive.
DE20200607U 2002-01-16 2002-01-16 Back projection unit has projector and transparent screen having mirror chain reflecting light from the projector through a gap behind the screen and at an acute angle to the transparent screen Expired - Lifetime DE20200607U1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE20200607U DE20200607U1 (en) 2002-01-16 2002-01-16 Back projection unit has projector and transparent screen having mirror chain reflecting light from the projector through a gap behind the screen and at an acute angle to the transparent screen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE20200607U DE20200607U1 (en) 2002-01-16 2002-01-16 Back projection unit has projector and transparent screen having mirror chain reflecting light from the projector through a gap behind the screen and at an acute angle to the transparent screen

Publications (1)

Publication Number Publication Date
DE20200607U1 true DE20200607U1 (en) 2003-06-05

Family

ID=7966618

Family Applications (1)

Application Number Title Priority Date Filing Date
DE20200607U Expired - Lifetime DE20200607U1 (en) 2002-01-16 2002-01-16 Back projection unit has projector and transparent screen having mirror chain reflecting light from the projector through a gap behind the screen and at an acute angle to the transparent screen

Country Status (1)

Country Link
DE (1) DE20200607U1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4030821A (en) * 1976-01-09 1977-06-21 Bell & Howell Company Rear screen projector with remote projection capability
DE19737861C1 (en) * 1997-08-29 1999-03-04 Ldt Gmbh & Co Rear projector

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4030821A (en) * 1976-01-09 1977-06-21 Bell & Howell Company Rear screen projector with remote projection capability
DE19737861C1 (en) * 1997-08-29 1999-03-04 Ldt Gmbh & Co Rear projector

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Legal Events

Date Code Title Description
R163 Identified publications notified
R207 Utility model specification

Effective date: 20030710

R156 Lapse of ip right after 3 years

Effective date: 20050802