Optics: image projectors – Picture carrier
Patent
1995-04-12
1997-04-22
Dowling, William
Optics: image projectors
Picture carrier
40701, G03B 2114
Patent
active
056224206
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a storage pocket for storing and displaying large diapositives, overhead transparencies or overhead pictures, preferably for storing overhead transparencies whose widths are smaller than the width of the light aperture of a standard overhead projector, wherein the pocket is constructed from a transparent supportive film and a transparent cover film, or from a folded single plastic sheet.
2. Description of the Prior Art
Large diapositives or overhead transparencies are often produced in A4-sizes, i.e. in a rectangular shape which deviates from the square light aperture possessed by standard overhead projectors. Consequently, when the transparency is placed centrally on the light aperture of the overhead projector, a light gap is formed on both sides of the overhead picture, these gaps being shown as two highly illuminated surfaces on both sides of the overhead picture shown on the screen. One method of eliminating these illuminating light gaps has been to use a commercially available plastic pocket provided with outwardly foldable flaps which are intended to cover the light gaps that are formed.
It is often desired by persons who use overhead pictures in conjunction with a presentation or lecture to obtain a neat and attractive framing of the message to be put across, although no suitable solution has hitherto been proposed.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a novel storage and projection pocket for overhead transparencies that can be produced simply and inexpensively and that includes means for framing attractively the message to be put across or conveyed, and also to dampen the light gaps or borders that are formed on both sides of the overhead picture.
The invention will now be described with reference to a non-limiting exemplifying embodiment thereof illustrated in the accompanying drawing.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 shows an aerial view of the inventive pocket.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The drawing illustrates an inventive pocket. The pocket is intended for storing and showing overhead transparencies of known standard size and is translucent so that the transparency need not be removed from the pocket when wishing to project the transparency onto a presentation screen or like surface with the aid of an overhead projector.
According to the invention, the pocket 1 is comprised of a transparent supportive film, for instance made of some suitable plastic material, on which a cover film is welded along two adjacent edges 2, 3 to form a pocket in which known overhead transparencies of standard size can be stored. Alternatively, the pocket 1 may comprise a folded single sheet of material which is welded along one edge to form a pocket. An overhead transparency can thus be inserted into the pocket 1, between the supportive film and the cover film, by bending the cover film away from the supportive film at its free corners, to some slight extent. The pocket is slightly larger than the overhead transparency, so as to accommodate the transparency.
As shown in the drawing, two flaps 4, 5 are mounted along the two long edges of the storage pocket. The two flaps are secured conveniently with the aid of adhesive tape 6 on the upper side or the lower side of the pocket 1, adjacent the two long edges, so as to enable the flaps 4, 5 to be folded out over the two long edges of the pocket 1. The flaps 4, 5 are made of a coloured but light-permeable material, so that when folded out over the long side edges of the pocket, the flaps 4, 5 will provide a coloured frame around the overhead transparency present in the pocket 1. The flaps 4, 5 have a width such that when the flaps 4, 5 are folded out, the pocket will have a generally square shape of the same measurements as the light aperture of a standard overhead projector.
A "negative" print, i.e. a part which does not include the light-permeable colour, can be placed in one or both flaps 4, 5 so as to enable the
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Dowling William
Plastus Kreativ AB
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