US 5,963,370 AGranted

Support structure for tensely extending and supporting film or sheet

AssigneeDai Nippon Printing Co., Ltd.

InventorSatoshi Nakamae

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Abstract

A flexible film of a synthetic resin is arranged on a rigid support plate, and both edges of the film in the tensely extending direction are attached to fixing portions of the support plate. The support plate is fitted into a frame body via the film, so that the film is tensely extended and supported between the frame body and the support plate. The support plate has arcuate raised portions extending in parallel to the fixing portions on the side of the film. In a case where the film is arranged so as to extend along the support plate to be attached to the fixing portions, the film is pushed by the arcuate raised portions of the support plate, so that a gap is formed below the film. When the support plate is fitted into the frame body via the film, the film is pushed and extended by the angular portions of the frame body, so that the gap is stopped.

Claims13

Dependent claims

In combination, a flexible optical lens comprising at least one of a film and sheet and a tensely extending support structure for supporting the flexible optical lens while tensely extending the flexible optical lens, said tensely extending support structure comprising:

a rigid support plate having a top surface on which the flexible optical lens is positioned tensely, and a fixing portion at each end, to which at least one of a pair of opposite edges of the flexible optical lens is fixed;
and
a frame body, into which said rigid support plate is fitted so that at least one of the pair of opposite edges of the flexible optical lens is fixed therebetween;
said rigid support plate having at least a pair of arcuate raised portions, each arcuate raised portion being adjacent to one fixing portion and curving away therefrom to contact tightly the flexible optical lens with said frame body so that a gap is formed below the flexible optical lens between each one of said arcuate raised portions and its adjacent fixing portion before said rigid support plate is fitted into said frame body, and
said frame body being provided with a pair of angular portions, each angular portion being received between one of said arcuate raised portions and its adjacent fixing portion, said angular portions eliminating said gap when said rigid support plate is fitted into said frame body.

2 more elements

Dependencies are inferred from the claim text.