Beam-indexing color picture tube arrangement
AssigneeHitachi, Ltd.
InventorsFumio Inoue, Hiroshi Jitsukata, Kunio Ando
Life of this patent
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Abstract
A frontal light extraction type beam-indexing color picture tube arrangement comprises a phosphor screen which is formed on the inner surface of the tube panel and includes an array of color phosphor stripes each of which has an appropriate afterglow time and an array of index phosphor stripes each of which has a short afterglow time and emits a light index signal representative of the scanning position of an electron beam in the forward direction of the tube panel. A photoelectric converter for receiving the light index signal is provided in front of the tube panel.
Claims12
A beam-indexing color picture arrangement comprising:
- an electron gun;
- a screen glass;
- a plurality of color phosphors provided on one surface of said screen glass facing said electron gun for respectively emitting predetermined color lights in the forward direction of said screen glass upon impingement of an electron beam thereon;
- index phosphors provided on said one surface of said screen glass in a predetermined positional relation with said color phosphors in juxtaposition therewith for respectively generating light index signals in the forward direction of said screen glass upon impingement of electron beam thereon, said index phosphors including a first index phosphor which has a short afterglow time and exhibits its emission spectrum different from all said color phosphors and a second index phosphor which has a short afterglow time and exhibits its emission spectrum similar to a specified one of said color phosphors, said first index phosphor being provided between the color phosphors other than said specified color phosphor and said second index phosphor being provided in a form mixed with said specified color phosphor;
- and
- photoelectric conversion means provided in front of said screen glass with a spaced relation therefrom for receiving said light index signals to convert them into electric signals.
A beam-indexing color reproducer comprising:
- a cathode ray tube having an electron gun for producing an electron beam and a screen glass with an inner surface arranged in opposition to said electron gun, a plurality of color phosphors being provided on the inner surface of said screen glass for respectively emitting different color lights toward an outer surface of said screen glass in response to impingement of the electron beam thereon, and an index phosphor being provided on the inner surface of said screen glass for emitting an invisible light toward the outer surface of said screen glass in response to impingement of the electron beam thereon;
- lens means disposed in spaced relation from the outer surface of said screen glass for enlarging an image produced on the outer surface of said screen glass;
- and
- conversion means disposed between the outer surface of said screen glass and said lens means proximate to an edge portion of said lens means for receiving emitted invisible light and converting the invisible light received thereby to an electric signal.
Dependencies are inferred from the claim text.