FR2131698A5 - Projection screen - with reflective plastic coating contg titanium dioxide - Google Patents

Projection screen - with reflective plastic coating contg titanium dioxide

Info

Publication number
FR2131698A5
FR2131698A5 FR7210916A FR7210916A FR2131698A5 FR 2131698 A5 FR2131698 A5 FR 2131698A5 FR 7210916 A FR7210916 A FR 7210916A FR 7210916 A FR7210916 A FR 7210916A FR 2131698 A5 FR2131698 A5 FR 2131698A5
Authority
FR
France
Prior art keywords
titanium dioxide
projection screen
contg
plastic coating
reflective plastic
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
FR7210916A
Other languages
French (fr)
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.)
TRELFORD EDWARD
Original Assignee
TRELFORD EDWARD
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 TRELFORD EDWARD filed Critical TRELFORD EDWARD
Application granted granted Critical
Publication of FR2131698A5 publication Critical patent/FR2131698A5/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

Landscapes

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

Abstract

A projection screen comprises a sheet with grooves on its observed face, pref. also with other grooves running transversely to these, so that between the sets of grooves pyramids of square or rhombus shape are produced. One surface may be coated with plastic (454g) contg. titanium dioxide (10-50g), optionally also contg. small glass balls to improve reflectivity.
FR7210916A 1971-03-29 1972-03-28 Projection screen - with reflective plastic coating contg titanium dioxide Expired FR2131698A5 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB808771 1971-03-29

Publications (1)

Publication Number Publication Date
FR2131698A5 true FR2131698A5 (en) 1972-11-10

Family

ID=9845511

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7210916A Expired FR2131698A5 (en) 1971-03-29 1972-03-28 Projection screen - with reflective plastic coating contg titanium dioxide

Country Status (5)

Country Link
BE (1) BE781336A (en)
DE (1) DE2214638A1 (en)
FR (1) FR2131698A5 (en)
IT (1) IT953572B (en)
NL (1) NL7204111A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996021883A2 (en) * 1995-01-14 1996-07-18 Optica Nova Onab Ab Projection screen
CN110554558A (en) * 2018-05-31 2019-12-10 深圳光峰科技股份有限公司 High-contrast reflecting screen

Also Published As

Publication number Publication date
IT953572B (en) 1973-08-10
DE2214638A1 (en) 1972-10-12
NL7204111A (en) 1972-10-03
BE781336A (en) 1972-07-17

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Legal Events

Date Code Title Description
ST Notification of lapse