US 5,085,495 A · Multi-screen projector

Abstract

A support member for supporting a plurality of vertically-arranged Fresnel sheets is fixedly mounted on a lower end portion of a reinforcing sheet. A hanging mechanism hangs the reinforcement sheet and the Fresnel sheets vertically adjustably. An elongated screen is constituted by a plurality of vertically-arranged unit screens, and the overall screen is constituted by a plurality of elongated screens arranged horizontally. A mechanism for preventing the relative displacement of the opposed edges of the elongated screens from each other in a direction perpendicular to the plane of the elongated screen is provided at an effective projection light-absent region where the light projected from projectors onto the screen is not hindered. A mechanism for limiting the absolute displacement of the elongated screens in a direction perpendicular to the plane of the elongated screen is provided at the right and left edges of the elongated screens and is disposed at the effective projection light-absent region. The limiting mechanism includes a plate member having a buckling load resistance, and pins connecting the opposite ends of the plate member respectively to the elongated screen and a fixed position in such a manner that the elongated screens are free to move vertically. A pillar member is used for fixing the end of the plate member, and a space between a support base supporting the unit projectors and the pillar members is used as a maintenance screen.

Claims25

Dependent claims

A multi-screen projector comprising:

n x m unit projectors arranged horizontally in m columns and vertically in n rows like a matrix, where n and m are positive integers either of which is two or more;
transmissive screen means comprising at least three-layer sheet means connected together in m columns, each column of said three-layer sheet means comprising (i) at least n rows of unit Fresnel sheets, (ii) a front sheet comprising a single front sheet element or n front sheet elements covering the n row, said front sheet having lenticular stripes for diffusing light horizontally, and (iii) a transparent reinforcing sheet on which each row of unit Fresnel sheets and said front sheet are placed in a laminated manner;
light shielding means mounted on a light incident side of said reinforcing sheet;
and
wires and springs connecting said light shielding means to at least right and left edges of said front sheet to produce tension so as to urge said front sheet toward said reinforcing sheet.

2 more elements

In a multi-screen projector comprising a plurality of unit projectors, and an overall screen composed of a plurality of unit screen portions corresponding respectively to said plurality of unit screens;

said overall screen being constituted by a plurality of vertically-elongated screens arranged side by side;
the improvement wherein forward-backward direction absolute displacement-limiting means for limiting the absolute displacement of the elongated screens in a direction perpendicular to the plane of said elongated screens is provided at the right and left edges of said elongated screens and is disposed at an effective projection light-absent region where the projection light projected from said projector onto said screen is not hindered;
and said absolute displacement-limiting means comprises a buckling load-resistant plate, and at least two pins one of which connects one end of said plate to the end of said elongated screen while the other pin connects the other end of said plate to an absolute fixing position in such a manner that said elongated screen is free to move at least upward and downward.

Dependencies are inferred from the claim text.

Multi-screen projector

Life of this patent

Multi-screen projector

Life of this patent

Abstract

Claims25