GB280927A - Improvements in or relating to optical projection screens - Google Patents

Improvements in or relating to optical projection screens

Info

Publication number
GB280927A
GB280927A GB30812/27A GB3081227A GB280927A GB 280927 A GB280927 A GB 280927A GB 30812/27 A GB30812/27 A GB 30812/27A GB 3081227 A GB3081227 A GB 3081227A GB 280927 A GB280927 A GB 280927A
Authority
GB
United Kingdom
Prior art keywords
screen
projection
blades
relating
projection screens
Prior art date
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
Application number
GB30812/27A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of GB280927A publication Critical patent/GB280927A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F11/00—Indicating arrangements for variable information in which the complete information is permanently attached to a movable support which brings it to the display position
    • G09F11/02—Indicating arrangements for variable information in which the complete information is permanently attached to a movable support which brings it to the display position the display elements being secured to rotating members, e.g. drums, spindles
    • G09F11/025—Indicating arrangements for variable information in which the complete information is permanently attached to a movable support which brings it to the display position the display elements being secured to rotating members, e.g. drums, spindles the members being rotated simultaneously, each face of the member carrying a part of the sign
    • 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
    • G03B21/62—Translucent screens
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F19/00—Advertising or display means not otherwise provided for
    • G09F19/12—Advertising or display means not otherwise provided for using special optical effects
    • G09F19/18—Advertising or display means not otherwise provided for using special optical effects involving the use of optical projection means, e.g. projection of images on clouds

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Marketing (AREA)
  • Blinds (AREA)

Abstract

280,927. Parolini, C. Nov. 18, 1926, [Convention date]. Drawings to Specification. Projection screens.- A set of blades or the equivalent arranged after the manner of the laths of a venetian blind is provided in front of a projection screen to shield it from daylight &c. The blades may be parallel, or at varying angles one to another, and may be perpendicular to the screen. They may be stationary in a fixed or removable frame or carriage. The screen may be translucent, and projection may be from the rear or from the front. The Specification as open to inspection under Sect. 91 (3 (a) comprises also blades carried by solid or perforated endless bands and moving in front of the screen during projection. This subject-matter does not appear in the Specification as accepted.
GB30812/27A 1926-11-18 1927-11-16 Improvements in or relating to optical projection screens Expired GB280927A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR280927X 1926-11-18

Publications (1)

Publication Number Publication Date
GB280927A true GB280927A (en) 1928-03-29

Family

ID=8886777

Family Applications (1)

Application Number Title Priority Date Filing Date
GB30812/27A Expired GB280927A (en) 1926-11-18 1927-11-16 Improvements in or relating to optical projection screens

Country Status (1)

Country Link
GB (1) GB280927A (en)

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