+

WO1996035141A1 - Ecran de projection avec gain de lumiere important - Google Patents

Ecran de projection avec gain de lumiere important Download PDF

Info

Publication number
WO1996035141A1
WO1996035141A1 PCT/PT1996/000002 PT9600002W WO9635141A1 WO 1996035141 A1 WO1996035141 A1 WO 1996035141A1 PT 9600002 W PT9600002 W PT 9600002W WO 9635141 A1 WO9635141 A1 WO 9635141A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
projection screen
fluted
gain
order
Prior art date
Application number
PCT/PT1996/000002
Other languages
English (en)
Inventor
Joaquim António ABRANTES CANDEIAS
Original Assignee
Abrantes Candeias Joaquim Anto
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 Abrantes Candeias Joaquim Anto filed Critical Abrantes Candeias Joaquim Anto
Priority to JP8533214A priority Critical patent/JPH10503034A/ja
Priority to AU54105/96A priority patent/AU5410596A/en
Priority to EP96911128A priority patent/EP0769163A1/fr
Publication of WO1996035141A1 publication Critical patent/WO1996035141A1/fr

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
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G03B21/60—Projection screens characterised by the nature of the surface

Definitions

  • Screen of light gain used for low luminosity sources, such as video projectors, for instance, are usually slightly reflective; their concave shape allows them to guide the light so that the luminosity can be more or less uniform to the spectators at every point of its surface.
  • a screen cannot be mirrored, because, as anyone with a slight knowledge of optics knows, what would be seen, besides the room and the projector, would be the circle of the lens at the point corresponding to the lens of the projector existing in the virtual room on the other side of the surface of the mirror.
  • the surface of the screen must diffuse the light in all directions, so that the light can reach the spectators from each and every point of the screen, even if they change position.
  • the solution found to date now is the use of slightly reflective dim pellicles (as if it were a dirty mirror, in which we can see hardly anything, but which still maintains some metallic brightness) being half way between mirrored and opaque. Nevertheless, in a bright environment, especially with low luminosity sources, the result is still unsatisfactory, because when the screen becomes semi-obscure, it only reflects part of the light, absorbing the rest, which is better in respect of a white wall, but is still far from being ideal.
  • one (2) which is slightly translucent, produces almost without light absorption the scattering of the light that passes through it, due to the micrometrical irregularity of its surface.
  • the second one (3) which completely mirrored, recedes the light in the oposite direction and, by crossing the first pellicle, scatters the light a bit more.
  • the pellicles are thin, they can be adhesive, and the first one can also have other characteristics, such as a surface with a configuration of multiple tiny lenses side by side or having a fluted or wavy surface, vertically or crossed vertically and horizontally causing a sufficient scattering of the light by diffraction so that transparent material can be used in order to make even more use of the light.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Overhead Projectors And Projection Screens (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Abstract

Cette invention concerne un écran de projection de forme concave offrant un gain de lumière important et dont la capacité de réflexion de la lumière est bien supérieure à celle des écrans traditionnels, étant donné que l'on fait appel à deux pellicules produisant des effets très différents au lieu de la surface argentée habituellement utilisée et du support structurel (1) de l'écran. La première pellicule (2) est légèrement translucide et, presque sans absorber la lumière, diffuse la lumière qui la traverse grâce aux irrégularités micrométriques de sa surface. La seconde pellicule (3), qui est complètement réfléchissante, renvoie la lumière dans la direction opposée et, lors du passage de la lumière à travers la première pellicule, permet de diffuser encore un peu plus celle-ci. Grâce à leur finesse, ces pellicules peuvent être adhésives, et la première peut également posséder d'autres caractéristiques tel qu'un surface striée afin d'accroître la dispersion de la lumière plus sur le plan horizontal que vertical, vu qu'il n'existe aucun besoin de gaspiller de la lumière vers le sol ou le plafond.
PCT/PT1996/000002 1995-05-04 1996-05-03 Ecran de projection avec gain de lumiere important WO1996035141A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP8533214A JPH10503034A (ja) 1995-05-04 1996-05-03 大きな光ゲインの映写スクリーン
AU54105/96A AU5410596A (en) 1995-05-04 1996-05-03 Projection screen of great light gain
EP96911128A EP0769163A1 (fr) 1995-05-04 1996-05-03 Ecran de projection avec gain de lumiere important

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PT916695U PT9166T (pt) 1995-05-04 1995-05-04 Ecran de projeccao de grande ganho luminoso
PT9166 1995-05-04

Publications (1)

Publication Number Publication Date
WO1996035141A1 true WO1996035141A1 (fr) 1996-11-07

Family

ID=20081164

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/PT1996/000002 WO1996035141A1 (fr) 1995-05-04 1996-05-03 Ecran de projection avec gain de lumiere important

Country Status (6)

Country Link
EP (1) EP0769163A1 (fr)
JP (1) JPH10503034A (fr)
AU (1) AU5410596A (fr)
CA (1) CA2194410A1 (fr)
PT (1) PT9166T (fr)
WO (1) WO1996035141A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003016982A3 (fr) * 2001-07-20 2003-11-20 Schneider Laser Technologies Systeme de projection

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4089587A (en) * 1974-11-29 1978-05-16 Schudel Conrad R Projection screen surface and method of forming said surface

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4089587A (en) * 1974-11-29 1978-05-16 Schudel Conrad R Projection screen surface and method of forming said surface

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003016982A3 (fr) * 2001-07-20 2003-11-20 Schneider Laser Technologies Systeme de projection

Also Published As

Publication number Publication date
AU5410596A (en) 1996-11-21
CA2194410A1 (fr) 1996-11-07
PT9166T (pt) 1996-12-31
EP0769163A1 (fr) 1997-04-23
JPH10503034A (ja) 1998-03-17

Similar Documents

Publication Publication Date Title
JP6676155B2 (ja) 人工天窓及び方法
RU2642138C2 (ru) Система искусственного освещения для имитации естественного освещения
US4298246A (en) Reflection type screen
US4510560A (en) Device for controlling light images
JP2019511812A (ja) 拡張された知覚される窓領域を有する太陽−天空模倣照明システム
US6844969B2 (en) Front projection type screen
JP2004505290A (ja) 黒色鋸歯状光学パネル
JPS6327807B2 (fr)
US5877893A (en) Holographic screen having light absorbers for absorbing ambient light
US4995701A (en) Anti-glare filter with improved viewing area
US11454930B2 (en) Holographic image display device
EP0769163A1 (fr) Ecran de projection avec gain de lumiere important
JP3346296B2 (ja) ホログラムスクリーンの製造方法
CN214278644U (zh) 一种抗光凌空全息成像装置
JPH06265888A (ja) 面光源素子
JPS647027A (en) Reflection type screen
KR920002322B1 (ko) 구면 스크린(screen)투영장치
RU2324211C1 (ru) Проекционный экран (варианты)
US4912752A (en) Optical projector for transparencies and opaques
JPH03127040A (ja) 反射型スクリーン
JPH0368931A (ja) スクリーン
KR20230099593A (ko) 측면 조명을 구비한 홀로그램 액자
KR200234063Y1 (ko) 교통 신호등용 렌즈
JP5301759B2 (ja) スクリーン及び画像投影システム
JP2007522495A (ja) 後面投射スクリーン

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AL AM AT AU AZ BB BG BR BY CA CH CN CZ DE DK EE ES FI GB GE HU IS JP KE KG KP KR KZ LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK TJ TM TR TT UA UG US UZ VN AM AZ BY KG KZ MD RU TJ TM

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): KE LS MW SD SZ UG AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN

ENP Entry into the national phase

Ref document number: 1997 776322

Country of ref document: US

Date of ref document: 19970103

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: 2194410

Country of ref document: CA

Ref document number: 1996911128

Country of ref document: EP

121 Ep: the epo has been informed by wipo that ep was designated in this application
WWP Wipo information: published in national office

Ref document number: 1996911128

Country of ref document: EP

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

WWW Wipo information: withdrawn in national office

Ref document number: 1996911128

Country of ref document: EP

点击 这是indexloc提供的php浏览器服务，不要输入任何密码和下载