BE814924A - DAY-TO-DAY PROJECTION DEVICE - Google Patents

DAY-TO-DAY PROJECTION DEVICE

Info

Publication number
BE814924A
BE814924A BE144230A BE144230A BE814924A BE 814924 A BE814924 A BE 814924A BE 144230 A BE144230 A BE 144230A BE 144230 A BE144230 A BE 144230A BE 814924 A BE814924 A BE 814924A
Authority
BE
Belgium
Prior art keywords
day
projection device
projection
day projection
Prior art date
Application number
BE144230A
Other languages
French (fr)
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 filed Critical
Publication of BE814924A publication Critical patent/BE814924A/en

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
    • 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
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2013—Plural light sources

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Projection Apparatus (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
BE144230A 1973-06-23 1974-05-13 DAY-TO-DAY PROJECTION DEVICE BE814924A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19737323841U DE7323841U (en) 1973-06-23 1973-06-23 DAYLIGHT PROJECTION DEVICE

Publications (1)

Publication Number Publication Date
BE814924A true BE814924A (en) 1974-09-02

Family

ID=6639341

Family Applications (1)

Application Number Title Priority Date Filing Date
BE144230A BE814924A (en) 1973-06-23 1974-05-13 DAY-TO-DAY PROJECTION DEVICE

Country Status (7)

Country Link
BE (1) BE814924A (en)
CH (1) CH566020A5 (en)
DE (1) DE7323841U (en)
DK (1) DK333674A (en)
FR (1) FR2234828A5 (en)
GB (1) GB1421095A (en)
NO (1) NO741871L (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7628047U1 (en) * 1976-09-08 1976-12-30 Rollei-Werke Franke & Heidecke, 3300 Braunschweig STILL PROJECTOR
US5301094A (en) * 1993-03-17 1994-04-05 Minnesota Mining And Manufacturing Company Lamp changing assembly for overhead projector

Also Published As

Publication number Publication date
CH566020A5 (en) 1975-08-29
FR2234828A5 (en) 1975-01-17
DE7323841U (en) 1973-11-22
GB1421095A (en) 1976-01-14
DK333674A (en) 1975-02-10
NO741871L (en) 1975-01-20

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