FR2021698A1 - - Google Patents

Info

Publication number
FR2021698A1
FR2021698A1 FR6936612A FR6936612A FR2021698A1 FR 2021698 A1 FR2021698 A1 FR 2021698A1 FR 6936612 A FR6936612 A FR 6936612A FR 6936612 A FR6936612 A FR 6936612A FR 2021698 A1 FR2021698 A1 FR 2021698A1
Authority
FR
France
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.)
Withdrawn
Application number
FR6936612A
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Publication of FR2021698A1 publication Critical patent/FR2021698A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens
    • 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
    • G03B21/625—Lenticular translucent screens

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Overhead Projectors And Projection Screens (AREA)
FR6936612A 1968-10-28 1969-10-24 Withdrawn FR2021698A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1968094019U JPS487050Y1 (en) 1968-10-28 1968-10-28

Publications (1)

Publication Number Publication Date
FR2021698A1 true FR2021698A1 (en) 1970-07-24

Family

ID=14098805

Family Applications (1)

Application Number Title Priority Date Filing Date
FR6936612A Withdrawn FR2021698A1 (en) 1968-10-28 1969-10-24

Country Status (4)

Country Link
JP (1) JPS487050Y1 (en)
DE (1) DE1953715A1 (en)
FR (1) FR2021698A1 (en)
GB (1) GB1258119A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2427620A1 (en) * 1978-05-30 1979-12-28 Rca Corp FRESNEL LENS, ESPECIALLY FOR SOLAR ENERGY CONCENTRATOR
FR2557983A1 (en) * 1984-01-09 1985-07-12 Loison Daniel Method and system for the formation and projection of images giving an impression of relief

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2629186C2 (en) * 1976-06-29 1985-10-03 Heinrich Wilke Gmbh, 3548 Arolsen Support rod that can be clamped between two walls
FR2472197A1 (en) * 1979-12-18 1981-06-26 Cintra Daniel Fresnel lens for TV screen - has grooves with sidewall being functions of groove and lens radii
US4701020A (en) * 1986-09-18 1987-10-20 North American Philips Consumer Electronics Corp. Rear projection screen with improved luminance uniformity
DE4121770A1 (en) * 1991-07-01 1993-01-07 Wilke Heinrich Hewi Gmbh ARRANGEMENT OF TWO TELESCOPICALLY CONNECTED COMPONENTS
DE19737107C2 (en) 1997-08-26 2001-02-08 Fresnel Optics Gmbh Optical arrangement consisting of at least two Fresnel lenses and a projection or display device with this arrangement

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2427620A1 (en) * 1978-05-30 1979-12-28 Rca Corp FRESNEL LENS, ESPECIALLY FOR SOLAR ENERGY CONCENTRATOR
FR2557983A1 (en) * 1984-01-09 1985-07-12 Loison Daniel Method and system for the formation and projection of images giving an impression of relief

Also Published As

Publication number Publication date
JPS487050Y1 (en) 1973-02-23
GB1258119A (en) 1971-12-22
DE1953715A1 (en) 1970-05-27

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Legal Events

Date Code Title Description
ST Notification of lapse