FR2561406B1 - Appareil de retroprojection - Google Patents

Appareil de retroprojection

Info

Publication number
FR2561406B1
FR2561406B1 FR8503702A FR8503702A FR2561406B1 FR 2561406 B1 FR2561406 B1 FR 2561406B1 FR 8503702 A FR8503702 A FR 8503702A FR 8503702 A FR8503702 A FR 8503702A FR 2561406 B1 FR2561406 B1 FR 2561406B1
Authority
FR
France
Prior art keywords
projection apparatus
back projection
projection
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 - Fee Related
Application number
FR8503702A
Other languages
English (en)
Other versions
FR2561406A1 (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.)
CHEBBAH AKLI
Original Assignee
CHEBBAH AKLI
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 CHEBBAH AKLI filed Critical CHEBBAH AKLI
Publication of FR2561406A1 publication Critical patent/FR2561406A1/fr
Application granted granted Critical
Publication of FR2561406B1 publication Critical patent/FR2561406B1/fr
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • G03B21/06—Projectors or projection-type viewers; Accessories therefor affording only episcopic projection
    • 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
    • G03B21/132—Overhead projectors, i.e. capable of projecting hand-writing or drawing during action

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Projection Apparatus (AREA)
FR8503702A 1984-03-13 1985-03-13 Appareil de retroprojection Expired - Fee Related FR2561406B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DZ847107 1984-03-13

Publications (2)

Publication Number Publication Date
FR2561406A1 FR2561406A1 (fr) 1985-09-20
FR2561406B1 true FR2561406B1 (fr) 1990-02-16

Family

ID=8161366

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8503702A Expired - Fee Related FR2561406B1 (fr) 1984-03-13 1985-03-13 Appareil de retroprojection

Country Status (1)

Country Link
FR (1) FR2561406B1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE133179C (fr) *
GB190922910A (en) * 1909-10-07 1910-06-16 Ernst Reiners Improved Apparatus for Projecting and Enlarging Pictures.
FR731359A (fr) * 1932-02-13 1932-09-02 Appareil d'agrandissement
FR969820A (fr) * 1948-08-03 1950-12-26 Dispositif permettant la projection par réflexion des corps opaques
US3900253A (en) * 1972-04-26 1975-08-19 Lindaco Ltd Optical projecting apparatus

Also Published As

Publication number Publication date
FR2561406A1 (fr) 1985-09-20

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Legal Events

Date Code Title Description
ST Notification of lapse