DE69509074D1 - Fresnellinse mit stufen auf beiden seiten fuer overheadprojektion - Google Patents

Fresnellinse mit stufen auf beiden seiten fuer overheadprojektion

Info

Publication number
DE69509074D1
DE69509074D1 DE69509074T DE69509074T DE69509074D1 DE 69509074 D1 DE69509074 D1 DE 69509074D1 DE 69509074 T DE69509074 T DE 69509074T DE 69509074 T DE69509074 T DE 69509074T DE 69509074 D1 DE69509074 D1 DE 69509074D1
Authority
DE
Germany
Prior art keywords
stages
sides
fresnel lens
overhead projection
overhead
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
DE69509074T
Other languages
English (en)
Other versions
DE69509074T2 (de
Inventor
Stephen K Eckhardt
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.)
3M Co
Original Assignee
Minnesota Mining and Manufacturing Co
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 Minnesota Mining and Manufacturing Co filed Critical Minnesota Mining and Manufacturing Co
Application granted granted Critical
Publication of DE69509074D1 publication Critical patent/DE69509074D1/de
Publication of DE69509074T2 publication Critical patent/DE69509074T2/de
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
    • G03B21/132—Overhead projectors, i.e. capable of projecting hand-writing or drawing during action
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Overhead Projectors And Projection Screens (AREA)
  • Projection Apparatus (AREA)
DE69509074T 1994-02-16 1995-02-16 Fresnellinse mit stufen auf beiden seiten fuer overheadprojektion Expired - Fee Related DE69509074T2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US19714994A 1994-02-16 1994-02-16
PCT/US1995/001796 WO1995022772A1 (en) 1994-02-16 1995-02-16 Dual grooved fresnel lens for overhead projection

Publications (2)

Publication Number Publication Date
DE69509074D1 true DE69509074D1 (de) 1999-05-20
DE69509074T2 DE69509074T2 (de) 1999-12-09

Family

ID=22728247

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69509074T Expired - Fee Related DE69509074T2 (de) 1994-02-16 1995-02-16 Fresnellinse mit stufen auf beiden seiten fuer overheadprojektion

Country Status (8)

Country Link
US (1) US5803568A (de)
EP (1) EP0745228B1 (de)
JP (1) JPH09509263A (de)
KR (1) KR100342724B1 (de)
CN (1) CN1051157C (de)
DE (1) DE69509074T2 (de)
ES (1) ES2129812T3 (de)
WO (1) WO1995022772A1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3655972B2 (ja) * 1996-08-16 2005-06-02 大日本印刷株式会社 反射型スクリーン及び前方投影システム
JP5053531B2 (ja) * 2005-09-14 2012-10-17 スリーエム イノベイティブ プロパティズ カンパニー フレネルレンズ
US7684126B2 (en) * 2006-02-24 2010-03-23 3M Innovative Properties Company Fresnel field lens
DE102009001102A1 (de) * 2009-02-24 2010-08-26 Evonik Röhm Gmbh Verfahren und Bemessungsregel zur Dimensionierung und Herstellung von Fresnel-Linsen zur Licht-Fokussierung
JP2013033163A (ja) * 2011-08-03 2013-02-14 Tomy Co Ltd 投影装置
JP6370626B2 (ja) * 2014-07-24 2018-08-08 オリンパス株式会社 照明光学系、照明装置、及び照明光学素子
US10468566B2 (en) * 2017-04-10 2019-11-05 Ideal Industries Lighting Llc Hybrid lens for controlled light distribution

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE761741C (de) * 1940-01-11 1954-03-01 Klangfilm G M B H Stufenlinse mit Stufen auf beiden Seiten
US3334958A (en) * 1963-08-07 1967-08-08 Minnesota Mining & Mfg Nested fresnel-type lenses
DD107347A1 (de) * 1973-06-14 1974-07-20
FR2472197A1 (fr) * 1979-12-18 1981-06-26 Cintra Daniel Lentille de fresnel et son application a la television
US4741613A (en) * 1986-12-19 1988-05-03 Minnesota Mining And Manufacturing Company Reduced height transmissive overhead projector
US4900129A (en) * 1988-12-16 1990-02-13 Minnesota Mining And Manufacturing Company Dual grooved Fresnel lens for overhead projection
US5296882A (en) * 1992-12-21 1994-03-22 Minnesota Mining And Manufacturing Company Overhead projector with catadioptric fresnel lens
US5317349A (en) * 1993-06-29 1994-05-31 Minnesota Mining And Manufacturing Company Overhead projector with achromatic fresnel lens
US5504544A (en) * 1994-11-23 1996-04-02 Minnesota Mining And Manufacturing Company Projector with multiple lamp light source

Also Published As

Publication number Publication date
ES2129812T3 (es) 1999-06-16
CN1051157C (zh) 2000-04-05
US5803568A (en) 1998-09-08
EP0745228A1 (de) 1996-12-04
KR100342724B1 (ko) 2002-12-05
WO1995022772A1 (en) 1995-08-24
CN1141080A (zh) 1997-01-22
JPH09509263A (ja) 1997-09-16
EP0745228B1 (de) 1999-04-14
DE69509074T2 (de) 1999-12-09
KR970701357A (ko) 1997-03-17

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee