Optical: systems and elements – Projection screen – Unitary sheet comprising plural refracting areas
Patent
1991-02-26
1992-02-04
Wintercorn, Richard A.
Optical: systems and elements
Projection screen
Unitary sheet comprising plural refracting areas
353 94, 358237, G03B 2160
Patent
active
050854950
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.
REFERENCES:
patent: 4919518 (1990-04-01), Ogino et al.
patent: 5011277 (1991-04-01), Ogino et al.
Iwahara Yoshiaki
Kobayashi Yukihiro
Kuroda Shoji
Ogino Masanori
Ohta Masutomi
Hitachi , Ltd.
Wintercorn Richard A.
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