GB439428A - Improvements in light projection apparatus - Google Patents

Improvements in light projection apparatus

Info

Publication number
GB439428A
GB439428A GB1682834A GB1682834A GB439428A GB 439428 A GB439428 A GB 439428A GB 1682834 A GB1682834 A GB 1682834A GB 1682834 A GB1682834 A GB 1682834A GB 439428 A GB439428 A GB 439428A
Authority
GB
United Kingdom
Prior art keywords
projection apparatus
light projection
optical
devices
air
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
GB1682834A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston 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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Priority to GB1682834A priority Critical patent/GB439428A/en
Publication of GB439428A publication Critical patent/GB439428A/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)

Abstract

439,428. Optical-projection apparatus. BRITISH THOMSON-HOUSTON CO., Ltd., Crown House, Aldwych, London, and TRENCHAM, H., Oakthorpe, King's End, Ruislip, Middlesex. June 6, 1934, No. 16828. [Class 97 (i)] [See also Group XI] Optical devices in light projection apparatus are mounted exteriorly upon a hollow bracket from which air blasts are delivered individually to the devices to prevent overheating by the light source. As shown, a tubular bracket 4, parallel to the light beam, carries a revoluble colour wheel 6 cooled by air from a nozzle 9 under the pressure of a blower 13. A plug 14 closes the end of the tube.
GB1682834A 1934-06-06 1934-06-06 Improvements in light projection apparatus Expired GB439428A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1682834A GB439428A (en) 1934-06-06 1934-06-06 Improvements in light projection apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1682834A GB439428A (en) 1934-06-06 1934-06-06 Improvements in light projection apparatus

Publications (1)

Publication Number Publication Date
GB439428A true GB439428A (en) 1935-12-06

Family

ID=10084415

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1682834A Expired GB439428A (en) 1934-06-06 1934-06-06 Improvements in light projection apparatus

Country Status (1)

Country Link
GB (1) GB439428A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2880432A1 (en) * 2005-01-06 2006-07-07 Thomson Licensing Sa Projector e.g. overhead projector, has rings comprising tube which includes air inlet that faces end of one of guides, and shaft and tube that form opening that permits passage of air flow created by wheel
EP1860496A1 (en) * 2006-05-25 2007-11-28 Funai Electric Co., Ltd. Video projector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2880432A1 (en) * 2005-01-06 2006-07-07 Thomson Licensing Sa Projector e.g. overhead projector, has rings comprising tube which includes air inlet that faces end of one of guides, and shaft and tube that form opening that permits passage of air flow created by wheel
EP1860496A1 (en) * 2006-05-25 2007-11-28 Funai Electric Co., Ltd. Video projector

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