GB145098A - Improvements in screens for optical projection apparatus - Google Patents

Improvements in screens for optical projection apparatus

Info

Publication number
GB145098A
GB145098A GB2020418A GB2020418A GB145098A GB 145098 A GB145098 A GB 145098A GB 2020418 A GB2020418 A GB 2020418A GB 2020418 A GB2020418 A GB 2020418A GB 145098 A GB145098 A GB 145098A
Authority
GB
United Kingdom
Prior art keywords
projection apparatus
screens
optical projection
halford
concaved
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
GB2020418A
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
Priority to GB2020418A priority Critical patent/GB145098A/en
Publication of GB145098A publication Critical patent/GB145098A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G03B21/606—Projection screens characterised by the nature of the surface for relief projection

Landscapes

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

Abstract

145,098. Halford, E. E. June 2, 1919. Optical projection apparatus. - Screens made curved or concaved, as shown in Fig. 1, have corrugated surfaces.
GB2020418A 1919-06-02 1919-06-02 Improvements in screens for optical projection apparatus Expired GB145098A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2020418A GB145098A (en) 1919-06-02 1919-06-02 Improvements in screens for optical projection apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2020418A GB145098A (en) 1919-06-02 1919-06-02 Improvements in screens for optical projection apparatus

Publications (1)

Publication Number Publication Date
GB145098A true GB145098A (en) 1920-07-02

Family

ID=10142142

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2020418A Expired GB145098A (en) 1919-06-02 1919-06-02 Improvements in screens for optical projection apparatus

Country Status (1)

Country Link
GB (1) GB145098A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1203979B (en) * 1957-01-15 1965-10-28 Albert Capetta Relief screen for displaying images

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1203979B (en) * 1957-01-15 1965-10-28 Albert Capetta Relief screen for displaying images

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