US3384432A - Curved screens and method of making same - Google Patents

Curved screens and method of making same Download PDF

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Publication number
US3384432A
US3384432A US467289A US46728965A US3384432A US 3384432 A US3384432 A US 3384432A US 467289 A US467289 A US 467289A US 46728965 A US46728965 A US 46728965A US 3384432 A US3384432 A US 3384432A
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United States
Prior art keywords
rods
screen
face
sheath
screens
Prior art date
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Expired - Lifetime
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US467289A
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English (en)
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Hourdiaux Jules
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Individual
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Individual
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS 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
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G03B21/58—Projection screens collapsible, e.g. foldable; of variable area
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS 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
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/54—Accessories
    • G03B21/56—Projection screens

Definitions

  • the present invention has essentially for its object improvements in curved screens for projecting motion-picture films or other images.
  • a projection screen which comprises a series of individual panels secured together in side-by-side relation.
  • Each panel comprises a plurality of juxtaposed screen elements overlapping partially each other and having each a light-diffusing front face, said front faces together constituting a single curved projection surface and being parallel to a direction perpendicular to the projection axis.
  • the diffusing elements forming said known curved screens may consist of rods having a T, L, trough, crescent or other cross-sectional contour, and comprising a convex face preferably so treated as to produce an integral reflection of the light received from the projector, this face constituting the projection face.
  • rods have a length equal to the panel height and are clamped at the upper and lower portions of the panel by fastening and pivot means whereby the rods may be given the desired orientation.
  • This specific form of embodiment of the panels may be used to advantage for constructing projection screens of relatively moderate height, that is, inferior to twentythree feet.
  • each diffusing element extending throughout the height of a panel consists of a plurality of rods disposed end to end and assembled at their adjacent ends by means of connecting members.
  • panels may be constructed from relatively short rod elements which are therefore easy to transport and handle.
  • each aforesaid connecting member may consist of a rigid 3,384,432 Patented May 21, 1968 sheath or like member of substantially cylindrical crosssectional contour which has formed on its concave face slideways or the like in which the ends of the two rods to be connected are adapted to be fitted.
  • This sheath constitutes a fastening means which is both simple and convenient and permits a rapid mounting of the rods.
  • said connecting member may consist of a clamp or like member made from a resilient material and comprising a rear face of substantially cylindrical configuration, adapted to bear on the concave faces of the rods to be interconnected, and a front face adapted to bear on that portion of the front face of the rods which is covered by the ladj acent rods.
  • FIGURE 1 shows two superposed rods assembled by means of a sheath-like connecting member, according to a typical form of embodiment of this invention
  • FIGURE 2 is a section taken upon the line 11-11 of the sheath shown in FIGURE 1;
  • FIGURE 3 is a perspective diagrammatic view showing superposed rods forming a screen element and mounted on a panel forming a part of the projection screen;
  • FIGURE 4 shows a clamp-shaped connecting member
  • FIGURE 5 is a fragmentary section taken upon the line VV of a screen portion shown in FIGURE 5, said screen being provided with said clamp-shaped connecting members;
  • FIGURE 6 is a front view showing one portion of a screen provided with clamps of said type
  • FIGURE 7 shows the cross-section of one portion of a screen made of rods according to this invention.
  • FIGURES 1 and 2 illustrate a typical form of embodiment of a connecting member 1 contemplated for assembling the elementary screens consisting of rods 4 and 5 having a trough-shaped cross-sectional contour, the convex faces 4a and 5a of said rods receiving and diffusing the light emitted by the projector (not shown).
  • This member consists of a sheath or the like having a substantially part-cylindrical configuration and, on its concave face 1a, a pair of dovetail-sectioned in-turned shoulders 2, 3 between which the ends of rods 4, 5 are adapted to be fitted. Each rod engages the sheath so as to occupy about one-half of its height as shown in FIGURE 1, the two rods thus engaged contacting each other with their adjacent ends.
  • the sheath and notably its concave face It is given substantially the same radius of curvature as the rods 4 and 5. It is to he noted that the convex face 1b of sheath 1 which covers the abutting ends of rods 4 and 5 constitutes a part of the projection surface of the screen as do the front convex faces 4a and 5a of rods 4 and 5.
  • FIGURE 3 shows the two superposed rods 4 and 5 of FIGURE 1, and the connecting member I mounted on a panel 10 of the type described in the aforesaid US. patent.
  • a plurality of screen elements each consisting of two rods assembled by a sheath, are mounted on said panel, the juxtaposed screen elements in the juxtaposed panels together constituting the single curved projection surface.
  • the sheath 1 may be made from any suitable and sufliciently rigid material, for example metal.
  • the sheath 1 may be made from any suitable and sufliciently rigid material, for example metal.
  • the sheath 1 may be made from any suitable and sufliciently rigid material, for example metal.
  • the connecting member is made from elastic material and in the form of a clamp 6.
  • This member has a p-art-cylindrical face 6a of a width substantially equal to the width of the rods to be assembled and a substantially narrower face 6b.
  • This clamp is made from a material having a sufficient resilience, for example steel, to permit the elastic movement of faces 6a and 6b away from each other.
  • the rods 4, 5 to be connected are fitted on either side of the clamp 6 one edge of each rod being inserted between the parts 6a and 6b of the clamp so that said rods are rigidly held by this member.
  • Each rod engages the clamp so as to occupy about one half of its height, the two rods thus engaged contacting each other with their adjacent ends as shown in FIG- URE 5.
  • the face 6b of the clamp engages the front faces of rods 4 and 5, but its width is so calculated that it cannot exceed the width of the rod 4 which is covered by the adjacent rod 4 (see FIGURE 5), whereby this face 6! is not visible by the spectator.
  • This clamp is advantageous in comparison with the sheath in that it avoids any projections or unevennesses 0n the screen face, whereby the diffusing element presents a continuous surface from top to bottom of the panel.
  • Another improvement consists in rounding the ends of the rods constittuing the elementary screens.
  • FIGURE 7 shows in cross-section one portion of a screen made of trough-shaped rods 8 having rounded edges 9. It will be seen that in this case not only the lightreceiving portion 8a of the front face 8a of the rod but also the edge 9, which has been bent to provide a round edge, receive and diffuse the light emitted by the projector.
  • the rods 8 overlap partially each other so that only a portion 8a of their front faces receives the light from the projector, which is located in the theater. that is the part indicated by T in FIGURE 7.
  • this projector (not shown) has its optical axis substantially perpendicular to the small surfaces 8a, in other words this optical axis is parallel to the direction indicated by F in FIGURE 7.
  • This round edge may, like said front face 8a, be treated with a view to ensure a proper diffusion of the light.
  • This specific form of embodiment of the rods is particularly advantageous for projecting pictures from projectors disposed outside the vertical median plane of the screen.
  • a projection screen comprising a series of individual panels which are secured together in side-by-side relation, each panel being provided with a plurality of juxtaposed screen elements each having a light diffusing front face, said front faces together constituting a single curved projection surface and being substantially parallel to a direction perpendicular to the projection axis throughout the screen surface, each screen element comprising a plurality of superposed rods disposed end to end and connecting members for securing said rods one with the other.
  • each rod has a trough-like configuration with a concave face and a convex face and each connecting member comprises a rigid sheath having a cylindrical cross-section and provided on its concave face with slideways in which the ends of two rods to be connected are inserted.
  • each rod has a trough-like configuration with a concave face and a convex face and each connecting member comprises a clamp made from a resilient material and having a back face of substantially cylindrical configuration adapted to bear against the concave faces of the rods to be interconnected and a front face adapted to bear on that portion of the convex face of the rods which is covered by the adjacent rods.
  • a curved screen according to claim 1 wherein said rods are so distributed in the panel that their connecting joints are shifted in relation to one another.
  • a curved screen according to claim 1 wherein said rods are trough-shaped with their edges so bent that when they are positioned on the panels they provide alon their edges light-diffusing faces.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Overhead Projectors And Projection Screens (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Operating, Guiding And Securing Of Roll- Type Closing Members (AREA)
  • Clamps And Clips (AREA)
US467289A 1964-06-30 1965-06-28 Curved screens and method of making same Expired - Lifetime US3384432A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR980225A FR87109E (fr) 1964-06-30 1964-06-30 Procédé de fabrication d'un écran courbe et écran ainsi obtenu

Publications (1)

Publication Number Publication Date
US3384432A true US3384432A (en) 1968-05-21

Family

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Application Number Title Priority Date Filing Date
US467289A Expired - Lifetime US3384432A (en) 1964-06-30 1965-06-28 Curved screens and method of making same

Country Status (11)

Country Link
US (1) US3384432A (fr)
AT (1) AT275909B (fr)
BE (1) BE666010A (fr)
CH (1) CH449998A (fr)
DE (1) DE1264099B (fr)
ES (1) ES314742A2 (fr)
FR (1) FR87109E (fr)
GB (1) GB1093639A (fr)
LU (1) LU48923A1 (fr)
NL (1) NL6508315A (fr)
OA (1) OA085E (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4318589A (en) * 1980-07-07 1982-03-09 The Singer Company Segmented curved screen construction for preserving a predefined curvature
US5098616A (en) * 1990-11-19 1992-03-24 Cae Electronics Ltd. Method for forming a curved projection screen

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1882829A (en) * 1930-10-29 1932-10-18 Bell Telephone Labor Inc Relief picture viewing screen
US2476521A (en) * 1947-09-22 1949-07-19 Vitarama Corp Screen for picture projections
FR1283342A (fr) * 1960-12-22 1962-02-02 Perfectionnements apportés aux écrans de projection, notamment pour le cinéma

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1882829A (en) * 1930-10-29 1932-10-18 Bell Telephone Labor Inc Relief picture viewing screen
US2476521A (en) * 1947-09-22 1949-07-19 Vitarama Corp Screen for picture projections
FR1283342A (fr) * 1960-12-22 1962-02-02 Perfectionnements apportés aux écrans de projection, notamment pour le cinéma

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4318589A (en) * 1980-07-07 1982-03-09 The Singer Company Segmented curved screen construction for preserving a predefined curvature
US5098616A (en) * 1990-11-19 1992-03-24 Cae Electronics Ltd. Method for forming a curved projection screen

Also Published As

Publication number Publication date
GB1093639A (en) 1967-12-06
NL6508315A (fr) 1965-12-31
DE1264099B (de) 1968-03-21
AT275909B (de) 1969-11-10
CH449998A (fr) 1968-01-15
LU48923A1 (fr) 1965-08-26
FR87109E (fr) 1966-06-17
ES314742A2 (es) 1966-05-16
BE666010A (fr) 1965-10-18
OA085E (fr) 1970-12-15

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