US1426317A - Cinematographic screen - Google Patents

Cinematographic screen Download PDF

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Publication number
US1426317A
US1426317A US49435821A US1426317A US 1426317 A US1426317 A US 1426317A US 49435821 A US49435821 A US 49435821A US 1426317 A US1426317 A US 1426317A
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United States
Prior art keywords
screen
cinematographic
metallic
powder
metallic surface
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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Ogilvie Julian Macartney
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Individual
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Priority to US49435821 priority Critical patent/US1426317A/en
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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
    • G03B21/60—Projection screens characterised by the nature of the surface
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31678—Of metal
    • Y10T428/31714—Next to natural gum, natural oil, rosin, lac or wax
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
    • Y10T442/2041—Two or more non-extruded coatings or impregnations
    • Y10T442/2098—At least two coatings or impregnations of different chemical composition
    • Y10T442/2107—At least one coating or impregnation contains particulate material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
    • Y10T442/259—Coating or impregnation provides protection from radiation [e.g., U.V., visible light, I.R., micscheme-change-itemave, high energy particle, etc.] or heat retention thru radiation absorption
    • Y10T442/2598—Radiation reflective

Definitions

  • This invention relates to screens for use in connection with cinematograph lanterns and like projection apparatus, of the kind having a metallic surface formed of powdered aluminium silver, bronze, or the like.
  • the object of the invention is to make such screens capable of producing a colour effect instead of the usual black and white efiect produced by the present screens of this type.
  • Another object of the invention is to reduce as far as possible the shadow efiect which is rather pronounced with metallic or metallized screens when viewed from acute angles and to obtain an even diffusion of light at all angles of observation.
  • the main feature of the invention consists in the use of a coloured background on to which the metallic powder is dusted or otherwise applied. Whilst any colours except black and white may be used, the colours preferably used are orange, or red, as being most suitable for general use. Green and blue backgrounds may be suitable for reproduction of wooded and like scenery and of sea-scapes.
  • the metallized surface of the screen has generally the efi'ect of reflecting the light and of producing a very clear reproduction of fine. detail, the coloured backound has the effect of giving a certain tone to the picture.
  • barium sulphate For reducing the shadow efiect and for matting the brilliant metallic surface barium sulphate is used as a final coating, which is spread on to or otherwise applied to the metallic coating.
  • the barium sulphate may also be mixed with the metallic powder.
  • the coloured background for the metallic surface may be produced in any suitable manner, but it is preferred to prepare this background in such amanner as to enable the metallic surface to be formed thereon in the usual manner.
  • Figure 1 1s a View of a port1on of a screen with parts of the coatings broken away.
  • FIG. 2 is a sectional view therethrough.
  • a screen embodying the features of the invention may be prepared in the following manner.
  • a canvas or cotton fabric 1 in one seamless sheet is prepared in the usual way for painting.
  • @ne or more coats of paint containing each white lead, red lead (or orange powder'iir other colouring matter), genuinelinseed oil and liquid driers are then applied either by means of a brush or of a hand-spraying machine. If handpainting is used the surface should be carefully stip-pled.
  • a final coat is, then applied which contains, in addition to the above mentioned ingredients, heavy stand 011.
  • metallic powder 2 for instance alumimumlpdwder, is then thrown by hand upon the final coating, which should be in a suitable condition, i. e., nearly dry, but should have sufficient tackiness to hold the powder.
  • the metallic powder is ently brushed all over the surface and. is nally, after a suitable interval, brushed ofi.
  • powder may, of course, be applied in any other suitable manner, for instance, it may be sprayed on.
  • the sheet is then sprayed one or more times with a mixture 3 of highly refined barium sulphate and glue diss0 ved in water.
  • barium sul hate on to the aluminium, the barium su phate may be mixed with the aluminium.
  • the combination of a coloured background with a metallic surface consisting of powdered metal is the mainfeature of the invention, the object of the coloured background being to soften the hard effect produced by the metallic surface and to give a definite tone to the picture.
  • a cinematographic screen comprising a red background, a metallic surface of powdered aluminum, and an outer coating of barium sulphate.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Overhead Projectors And Projection Screens (AREA)

Description

J. M. OGILVIE. CINEMATOGRAPHIC SCREEN. APPLICATION FILED AUG.22,1921.
stares- UINEMATOGBAPHIC SCREEN.
Specification of Letters Patent. 'Patgntd A 15 1922 Application filed August 22, 1921. Serial No. 494,358.
To all whom it my concern.-
Be it known that I, JULIAN MAOARTNEY OGILVIE, a subject of the King of England, residing at 68 Warwick Gardens, Earls Court, London, S. W., England, have invented certain new and useful improvements in cinematographic Screens (for which I have filed applications in England Aug .l6, 1920, Sept. 9, 1920, and May 17, 1921), of which the following is a specification.
This invention relates to screens for use in connection with cinematograph lanterns and like projection apparatus, of the kind having a metallic surface formed of powdered aluminium silver, bronze, or the like.
The object of the invention is to make such screens capable of producing a colour effect instead of the usual black and white efiect produced by the present screens of this type. Another object of the invention is to reduce as far as possible the shadow efiect which is rather pronounced with metallic or metallized screens when viewed from acute angles and to obtain an even diffusion of light at all angles of observation.
As far as the colour eifect is concerned the main feature of the invention consists in the use of a coloured background on to which the metallic powder is dusted or otherwise applied. Whilst any colours except black and white may be used, the colours preferably used are orange, or red, as being most suitable for general use. Green and blue backgrounds may be suitable for reproduction of wooded and like scenery and of sea-scapes.
Whilst the metallized surface of the screen has generally the efi'ect of reflecting the light and of producing a very clear reproduction of fine. detail, the coloured backound has the effect of giving a certain tone to the picture.
For reducing the shadow efiect and for matting the brilliant metallic surface barium sulphate is used as a final coating, which is spread on to or otherwise applied to the metallic coating. The barium sulphate may also be mixed with the metallic powder. a g
The coloured background for the metallic surface may be produced in any suitable manner, but it is preferred to prepare this background in such amanner as to enable the metallic surface to be formed thereon in the usual manner. In the accompanying drawing, Figure 1 1s a View of a port1on of a screen with parts of the coatings broken away.
Figure 2 is a sectional view therethrough. A screen embodying the features of the invention may be prepared in the following manner. A canvas or cotton fabric 1 in one seamless sheet is prepared in the usual way for painting. @ne or more coats of paint containing each white lead, red lead (or orange powder'iir other colouring matter), genuinelinseed oil and liquid driers, are then applied either by means of a brush or of a hand-spraying machine. If handpainting is used the surface should be carefully stip-pled. A final coat is, then applied which contains, in addition to the above mentioned ingredients, heavy stand 011. metallic powder 2, for instance alumimumlpdwder, is then thrown by hand upon the final coating, which should be in a suitable condition, i. e., nearly dry, but should have sufficient tackiness to hold the powder. The metallic powder is ently brushed all over the surface and. is nally, after a suitable interval, brushed ofi. The
powder may, of course, be applied in any other suitable manner, for instance, it may be sprayed on. The sheet is then sprayed one or more times with a mixture 3 of highly refined barium sulphate and glue diss0 ved in water. barium sul hate on to the aluminium, the barium su phate may be mixed with the aluminium.
The combination of a coloured background with a metallic surface consisting of powdered metal is the mainfeature of the invention, the object of the coloured background being to soften the hard effect produced by the metallic surface and to give a definite tone to the picture.
' I claim-- 1. A cinematographic screen com rising a colored background, a metallic sur ace of powdered aluminum, and an outer coating of barium sulphate.
2. A cinematographic screen comprising a red background, a metallic surface of powdered aluminum, and an outer coating of barium sulphate.
3. A cinematographic screen comprising a sheet of fabric, a plurality of coats of Instead of spraying the the metallic surface, substantially as de- 10 scribed.
lln testimon whereof he has hereunto set his hand in t e presence of two witnesses.
JULIAN MACARTNEY OGILVIE. Witnesses:
S. SoKAL,
I. McGIBBoN.
US49435821 1921-08-22 1921-08-22 Cinematographic screen Expired - Lifetime US1426317A (en)

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