GB1231600A - - Google Patents

Info

Publication number
GB1231600A
GB1231600A GB1231600DA GB1231600A GB 1231600 A GB1231600 A GB 1231600A GB 1231600D A GB1231600D A GB 1231600DA GB 1231600 A GB1231600 A GB 1231600A
Authority
GB
United Kingdom
Prior art keywords
lamp
air
lamphouse
partly
aperture
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
Application number
Other languages
English (en)
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 GB1231600A publication Critical patent/GB1231600A/en
Expired 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
    • G03B21/14—Details
    • G03B21/16—Cooling; Preventing overheating

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Projection Apparatus (AREA)
  • Overhead Projectors And Projection Screens (AREA)
GB1231600D 1968-12-13 1968-12-13 Expired GB1231600A (ja)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5953468 1968-12-13

Publications (1)

Publication Number Publication Date
GB1231600A true GB1231600A (ja) 1971-05-12

Family

ID=10483946

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1231600D Expired GB1231600A (ja) 1968-12-13 1968-12-13

Country Status (1)

Country Link
GB (1) GB1231600A (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2594990A1 (en) * 2011-11-17 2013-05-22 Ricoh Company Ltd. Image projection apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2594990A1 (en) * 2011-11-17 2013-05-22 Ricoh Company Ltd. Image projection apparatus
US9010940B2 (en) 2011-11-17 2015-04-21 Ricoh Company, Limited Image projection apparatus
US9010939B2 (en) 2011-11-17 2015-04-21 Ricoh Company, Limited Image projection apparatus
US9304381B2 (en) 2011-11-17 2016-04-05 Ricoh Company, Limited Image projection apparatus

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees