JPS57204686A - Back projection television set - Google Patents

Back projection television set

Info

Publication number
JPS57204686A
JPS57204686A JP8991281A JP8991281A JPS57204686A JP S57204686 A JPS57204686 A JP S57204686A JP 8991281 A JP8991281 A JP 8991281A JP 8991281 A JP8991281 A JP 8991281A JP S57204686 A JPS57204686 A JP S57204686A
Authority
JP
Japan
Prior art keywords
projection
ray tube
back projection
cathode ray
reflectors
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.)
Pending
Application number
JP8991281A
Other languages
Japanese (ja)
Inventor
Shoichi Sato
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP8991281A priority Critical patent/JPS57204686A/en
Publication of JPS57204686A publication Critical patent/JPS57204686A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Abstract

PURPOSE:To prevent a time aging drop of luminance and contrast, and an increase of flare and ghost, due to adhesion of fine dust, by storing a front part of a projection cathode ray tube, a projection lens, a reflector and a back projection screen in a dustproof case. CONSTITUTION:A picture of a projection cathode ray tube 12 passes through a projection lens 13, is reflected by reflectors 14, 15, and is expanded and displayed on a back projection screen 16. A front part of the projection cathode ray tube 12, the projection lens 13, the reflectors 14, 15, and the back projection screen 6 are stored in the inside of a dust proof case 17 for preventing dust from going in. The dustproof case 17 is formed, for instance,by a synthetic resin material, and it is fastened to a housing by means of screw setting or adhesion, etc.
JP8991281A 1981-06-11 1981-06-11 Back projection television set Pending JPS57204686A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8991281A JPS57204686A (en) 1981-06-11 1981-06-11 Back projection television set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8991281A JPS57204686A (en) 1981-06-11 1981-06-11 Back projection television set

Publications (1)

Publication Number Publication Date
JPS57204686A true JPS57204686A (en) 1982-12-15

Family

ID=13983919

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8991281A Pending JPS57204686A (en) 1981-06-11 1981-06-11 Back projection television set

Country Status (1)

Country Link
JP (1) JPS57204686A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62178227A (en) * 1986-01-28 1987-08-05 フィリップス　エレクトロニクス　ネムローゼ　フェンノートシャップ Rear projection unit
US5184224A (en) * 1990-07-03 1993-02-02 Matsushita Electric Industrial Co., Ltd. Television projection screen having anti-static elements

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62178227A (en) * 1986-01-28 1987-08-05 フィリップス　エレクトロニクス　ネムローゼ　フェンノートシャップ Rear projection unit
US5184224A (en) * 1990-07-03 1993-02-02 Matsushita Electric Industrial Co., Ltd. Television projection screen having anti-static elements

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