JPS54137919A - Projection television unit - Google Patents
Projection television unitInfo
- Publication number
- JPS54137919A JPS54137919A JP4629878A JP4629878A JPS54137919A JP S54137919 A JPS54137919 A JP S54137919A JP 4629878 A JP4629878 A JP 4629878A JP 4629878 A JP4629878 A JP 4629878A JP S54137919 A JPS54137919 A JP S54137919A
- Authority
- JP
- Japan
- Prior art keywords
- scanning
- electron
- brightness
- screen
- picture
- 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
Links
Landscapes
- Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
Abstract
PURPOSE: To increase the brightness of a picture with the brightness of a blue CRT increased by increasing the scan area on a screen by elongating scanning-beam spot in the horizontal direction by changing the constitution of an electromagnetic focusing unit used for the blue CRT.
CONSTITUTION: This unit is equipped with an electron gun, an electron-beam focusing part including electromagnetic focusing unit 12, three red, green and bule CRTs which have electron-beam scanning deflection parts and are equipped with pattern reproduction surfaces by an electron beam, and a screen which composes a tri-color picture projected from three CRTs. Then, electromagnetic focusing unit 10 using a permanent magent inserted into neck part 1 of the blue CRT is provided with identically-shaped magnetic substances 11 perpendicularly to the scanning direction of a scanning beam, so as to make uneven the intensity valus of magnetic fields parallel and perpendicular to the scanning direction of the scanning beam. Then, the brightness of a picture is increased by increasing the scan area on the screen.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4629878A JPS54137919A (en) | 1978-04-18 | 1978-04-18 | Projection television unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4629878A JPS54137919A (en) | 1978-04-18 | 1978-04-18 | Projection television unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54137919A true JPS54137919A (en) | 1979-10-26 |
Family
ID=12743294
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4629878A Pending JPS54137919A (en) | 1978-04-18 | 1978-04-18 | Projection television unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54137919A (en) |
-
1978
- 1978-04-18 JP JP4629878A patent/JPS54137919A/en active Pending
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