JPS5470062A - Projection type image display device - Google Patents

Projection type image display device

Info

Publication number
JPS5470062A
JPS5470062A JP13754877A JP13754877A JPS5470062A JP S5470062 A JPS5470062 A JP S5470062A JP 13754877 A JP13754877 A JP 13754877A JP 13754877 A JP13754877 A JP 13754877A JP S5470062 A JPS5470062 A JP S5470062A
Authority
JP
Japan
Prior art keywords
glass
medium
light
refractive index
mirror
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.)
Granted
Application number
JP13754877A
Other languages
Japanese (ja)
Other versions
JPS6033023B2 (en
Inventor
Osamu Konosu
Nozomi Arimoto
Osamu Yoshida
Masanori Takagawa
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electronics Corp
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 Matsushita Electronics Corp filed Critical Matsushita Electronics Corp
Priority to JP52137548A priority Critical patent/JPS6033023B2/en
Publication of JPS5470062A publication Critical patent/JPS5470062A/en
Publication of JPS6033023B2 publication Critical patent/JPS6033023B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Overhead Projectors And Projection Screens (AREA)
  • Lenses (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Abstract

PURPOSE: To improve light focusing rate to the inside face of a concave mirror and perform highly efficient image projection by focusing the image light projected on a braun tube screen with a light medium of more than 1 in refractive index.
CONSTITUTION: The light emitted by the fluorescent substance 23 coated on the inside surface of the front glass 22 of a braun tube 21 is focused within the critical angle determined by the refractive index of the glass 22. A light medium 24 formed with a transparent solid such as glass, acrylic resin or the like whose refractive index is more than 1 and is equal to or higher than that of the glass is provided on the outside of said glass 22. The critical angle of the light emitted by the fluorescent substance 23 is decreased by the medium 24, whereby light focusing rate is improved. Hence, the reflected luminous flux by the mirror 27 of the luminous flux having been highly efficiently focused on the concave reflecting mirror 27 provided on the surface of the medium 24 opposing to the glass 22 is imaged onto a screen 32 after its aberrations have been corrected by the specified curved face 30 on the other side of the medium 24, whereby the highly efficiently projected image is displayed.
COPYRIGHT: (C)1979,JPO&Japio
JP52137548A 1977-11-15 1977-11-15 Projection image display device Expired JPS6033023B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP52137548A JPS6033023B2 (en) 1977-11-15 1977-11-15 Projection image display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP52137548A JPS6033023B2 (en) 1977-11-15 1977-11-15 Projection image display device

Publications (2)

Publication Number Publication Date
JPS5470062A true JPS5470062A (en) 1979-06-05
JPS6033023B2 JPS6033023B2 (en) 1985-07-31

Family

ID=15201261

Family Applications (1)

Application Number Title Priority Date Filing Date
JP52137548A Expired JPS6033023B2 (en) 1977-11-15 1977-11-15 Projection image display device

Country Status (1)

Country Link
JP (1) JPS6033023B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59142513A (en) * 1983-02-04 1984-08-15 Hitachi Ltd Picture projecting device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0372612U (en) * 1989-11-18 1991-07-23

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59142513A (en) * 1983-02-04 1984-08-15 Hitachi Ltd Picture projecting device

Also Published As

Publication number Publication date
JPS6033023B2 (en) 1985-07-31

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