DE1808532B2 - Blendschutzschirm fuer staenderprojektoren - Google Patents

Blendschutzschirm fuer staenderprojektoren

Info

Publication number
DE1808532B2
DE1808532B2 DE19681808532 DE1808532A DE1808532B2 DE 1808532 B2 DE1808532 B2 DE 1808532B2 DE 19681808532 DE19681808532 DE 19681808532 DE 1808532 A DE1808532 A DE 1808532A DE 1808532 B2 DE1808532 B2 DE 1808532B2
Authority
DE
Germany
Prior art keywords
glare
lens
screen
projection
fresnel
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.)
Withdrawn
Application number
DE19681808532
Other languages
German (de)
English (en)
Other versions
DE1808532A1 (de
Inventor
James Vincent Appeldorn Roger Henry Wilmore Naaman Wilson St Paul Minn Erwin (V St A )
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
Publication of DE1808532A1 publication Critical patent/DE1808532A1/de
Publication of DE1808532B2 publication Critical patent/DE1808532B2/de
Withdrawn legal-status Critical Current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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Overhead Projectors And Projection Screens (AREA)
  • Projection Apparatus (AREA)
  • Optical Elements Other Than Lenses (AREA)
DE19681808532 1967-11-14 1968-11-08 Blendschutzschirm fuer staenderprojektoren Withdrawn DE1808532B2 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US68295167A 1967-11-14 1967-11-14
US71226368A 1968-03-11 1968-03-11
US71226268A 1968-03-11 1968-03-11

Publications (2)

Publication Number Publication Date
DE1808532A1 DE1808532A1 (de) 1969-08-07
DE1808532B2 true DE1808532B2 (de) 1972-01-27

Family

ID=27418406

Family Applications (2)

Application Number Title Priority Date Filing Date
DE19681808532 Withdrawn DE1808532B2 (de) 1967-11-14 1968-11-08 Blendschutzschirm fuer staenderprojektoren
DE19681817823 Expired DE1817823C3 (de) 1967-11-14 1968-11-08 Blendschutzschirm für Ständerprojektoren. Ausscheidung aus: 1808532

Family Applications After (1)

Application Number Title Priority Date Filing Date
DE19681817823 Expired DE1817823C3 (de) 1967-11-14 1968-11-08 Blendschutzschirm für Ständerprojektoren. Ausscheidung aus: 1808532

Country Status (7)

Country Link
JP (1) JPS5126808B1 (enrdf_load_stackoverflow)
CH (1) CH494975A (enrdf_load_stackoverflow)
DE (2) DE1808532B2 (enrdf_load_stackoverflow)
FR (1) FR1591751A (enrdf_load_stackoverflow)
GB (1) GB1253237A (enrdf_load_stackoverflow)
NL (1) NL164396B (enrdf_load_stackoverflow)
SE (1) SE347581B (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2914682A1 (de) * 1979-04-11 1981-03-26 Schott Glaswerke, 55122 Mainz Als lichtblende wirkende glasplatte und verfahren zu ihrer herstellung
DE3414848A1 (de) * 1983-04-26 1984-11-22 Barmag Barmer Maschinenfabrik Ag, 5630 Remscheid Lichtdurchlaessiger verbundkoerper

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2937433C2 (de) * 1979-09-15 1981-08-06 Standard Elektrik Lorenz Ag, 7000 Stuttgart Belichtungsanordnung
DE3127247A1 (de) * 1981-07-10 1983-01-20 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Verfahren zum herstellen eines jalousiefilters und vorrichtung zur durchfuehrung des verfahrens
WO2021198888A1 (en) 2020-03-31 2021-10-07 Pi Industries Ltd. An improved enzyme catalyzed carboxylation reaction

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3255665A (en) * 1964-05-21 1966-06-14 Minnesota Mining & Mfg Article of manufacture for controlling light transmittance
US3340765A (en) * 1964-07-27 1967-09-12 Bell Telephone Labor Inc Projection system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2914682A1 (de) * 1979-04-11 1981-03-26 Schott Glaswerke, 55122 Mainz Als lichtblende wirkende glasplatte und verfahren zu ihrer herstellung
DE3414848A1 (de) * 1983-04-26 1984-11-22 Barmag Barmer Maschinenfabrik Ag, 5630 Remscheid Lichtdurchlaessiger verbundkoerper

Also Published As

Publication number Publication date
SE347581B (enrdf_load_stackoverflow) 1972-08-07
NL164396B (nl) 1980-07-15
DE1817823B2 (de) 1974-01-03
CH494975A (de) 1970-08-15
NL6815702A (enrdf_load_stackoverflow) 1969-05-19
DE1817823A1 (de) 1972-03-09
GB1253237A (enrdf_load_stackoverflow) 1971-11-10
DE1817823C3 (de) 1974-07-25
JPS5126808B1 (enrdf_load_stackoverflow) 1976-08-09
DE1808532A1 (de) 1969-08-07
FR1591751A (enrdf_load_stackoverflow) 1970-05-04

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Legal Events

Date Code Title Description
E77 Valid patent as to the heymanns-index 1977
8339 Ceased/non-payment of the annual fee