Claims
- 1. A cathode ray tube having a glass panel and an optically machine-readable marking on a sidewall of said glass panel, said machine-readable marking comprising an undercoating layer of heat-resistant and acid-resistant paint, a mark printed on said undercoating layer with heat-resistant ink, and a transparent heat-resistant and acid-resistant overcoating layer covering said mark.
- 2. A cathode ray tube as claimed in claim 1, wherein said undercoating layer is white or other light color.
- 3. A cathode ray tube as claimed in claim 1, wherein said mark is a bar code.
- 4. A cathode ray tube as claimed in claim 1, wherein said mark includes at least a bar code, and the width of a thick bar of said bar code ranges from 0.5 to 2.0 mm.
- 5. A cathode ray tube as claimed in claim 1, wherein said mark comprises a bar code and visually readable characters or symbols.
- 6. A cathode ray tube as claimed in one of claims 2 to 5, wherein an implosion-proofing band is disposed on said glass panel and a position of said bar code on a sidewall of said glass panel is not less than 5.0 mm away from a sealing edge of said glass panel and closer to said sealing edge than to a position of said implosion-proofing band.
- 7. A cathode ray tube as claimed in claim 1, wherein said undercoating and overcoating layers are mainly composed of high polymeric polysiloxane resin.
- 8. A cathode ray tube as claimed in claim 1, wherein said undercoating and overcoating layers comprise high polymeric polysiloxane resin.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3-338016 |
Nov 1991 |
JPX |
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Parent Case Info
This application is a continuation of Ser. No. 982,975, filed Nov. 30, 1992.
US Referenced Citations (11)
Foreign Referenced Citations (2)
Number |
Date |
Country |
0157779 |
Sep 1984 |
JPX |
0082433 |
Mar 1990 |
JPX |
Non-Patent Literature Citations (1)
Entry |
Patent Abstracts of Japan, vol. 9, No. 220 (E-341) 6 Sep. 1985 & JP-A-60 081 744 (Nippon Denki K.K.) 9 May 1985. |
Continuations (1)
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Number |
Date |
Country |
Parent |
982975 |
Nov 1992 |
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