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1. WO1991000546 - OVERHEAD PROJECTOR

Publication Number WO/1991/000546
Publication Date 10.01.1991
International Application No. PCT/FI1989/000124
International Filing Date 28.06.1989
Chapter 2 Demand Filed 04.01.1991
IPC
G03B 21/132 2006.01
GPHYSICS
03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
BAPPARATUS 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
21Projectors or projection-type viewers; Accessories therefor
132Overhead projectors, i.e. capable of projecting hand-writing or drawing during action
CPC
G03B 21/132
GPHYSICS
03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
BAPPARATUS 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
21Projectors or projection-type viewers; Accessories therefor
132Overhead projectors, i.e. capable of projecting hand-writing or drawing during action
Y10S 353/03
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
10TECHNICAL SUBJECTS COVERED BY FORMER USPC
STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
353Optics: image projectors
03Transparent
Applicants
  • EDUCATEK OY [FI/FI]; Lääkärintie 5 I SF-01900 Nurmijärvi, FI (AllExceptUS)
  • TARIK, Al-Ani [FI/FI]; FI (UsOnly)
Inventors
  • TARIK, Al-Ani; FI
Agents
  • LEITZINGER OY; Ruoholahdenkatu 8 SF-00180 Helsinki, FI
Priority Data
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) OVERHEAD PROJECTOR
(FR) RETROPROJECTEUR
Abstract
(EN)
The objective of the invention is an overhead projector (1) supplied with acetate film rolls (4), to which projector belongs a body (2) onto which is fixed a projection arm (16) equipped with a lens/lenses (21) and a flat mirror (20). The body (2) is supplied with an openable top part (3) into which roll spaces are arranged for the acetate film rolls (4). The acetate film rolls (4) are installed on axle rods (26) which are supplied with rotating cylinders (5) and mounted in the top part (3) at opposite ends in the shaped spaces with the aid of a bent spring and fixing hole. In the inner side of the body (2) is also arranged at least one shutter screen element (10-13) that stays inside the body (2) in all cases of use, and which is installed to cover the projected part of the acetate film (6) fully or partially. The screen elements are moved in a flat level on guiding rods (15) inside the body (2) in the directions of the length and/or width of the body (2) with the help of levers (14).
(FR)
L'invention concerne un rétroprojecteur (1) alimenté en rouleaux de films acétate (4). Ledit projecteur comprend un corps (2) sur lequel est monté un bras de projection (16) doté d'une ou plusieurs lentilles (21) et d'un miroir plat (20). Ledit corps (2) comprend une partie supérieure pouvant s'ouvrir (3) dans laquelle sont disposés des espaces pour recevoir lesdits rouleaux de film acétate (4). Les rouleaux de film (4) sont montés sur des arbres (26) pourvus de cylindres rotatifs (5), et aménagés dans ladite partie supérieure (3) aux extrémités opposées dans les espaces formés à l'aide d'un ressort plié et d'un trou de fixation. Au moins un élément d'écran obturateur (10-13) est disposé également dans le côté intérieur dudit corps (2). Ledit élément d'écran, destiné à couvrir partiellement ou totalement la partie projetée du film acétate (6), reste dans le corps (2) lors de tout usage. Les éléments d'écran se déplacent, à un niveau plat, sur des barres de guidage (15) disposées dans le corps (2) dans le sens de la longueur et/ou de la largeur dudit corps (2) à l'aide de levier (14).
Also published as
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