Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
143 words
A display tube characterised by an evacuated envelope having substantially flat, parallel spaced-apart front and rear walls and a plurality of support means dividing the interior of the envelope into a plurality of modules extending between the front and rear walls for substantially the full height of the envelope and a cathodoluminescent screen on the interior of the front wall, wherein each module comprises an electron beam producing means arranged to produce and direct an electron beam along a first path substantially parallel to the rear wall, first deflection means for deflecting the electron beam from a first path into one of a plurality of second paths extending towards the screen, a channel plate electron multiplier extending transverse to said second paths and second deflection means for causing the electron beam to scan in a direction transverse to the first and/or second paths.
Claim 2
Dependent Claim
143 words
A display tube characterised by an evacuated envelope having substantially flat, parallel spaced-apart front and rear walls and a plurality of support means dividing the interior of the envelope into a plurality of modules extending between the front and rear walls for substantially the full height of the envelope and a cathodoluminescent screen on the interior of the front wall, wherein each module comprises an electron beam producing means arranged to produce and direct an electron beam along a first path substantially parallel to the rear wall, first deflection means for deflecting the electron beam from a first path into one of a plurality of second paths extending towards the screen, a channel plate electron multiplier extending transverse to said second paths and second deflection means for causing the electron beam to scan in a direction transverse to the first and/or second paths.
Claim 3
Dependent Claim
51 words
A display tube as claimed in Claim 1, characterised in that the second deflection means is disposed between the electron multiplier and the screen and in that the second deflection means comprise pairs of parallel electrodes disposed between the electron multiplier and the screen and extending substantially perpendicular to the screen.
Claim 4
Dependent Claim
47 words
A display tube as claimed in Claim 1, characterised in that the second deflection means is disposed between the electron multiplier and the screen and in that the second deflection means comprise pairs of electrodes which diverge in the direction from the electron multiplier towards the screen.
Claim 5
Dependent Claim
40 words
A display tube as claimed in Claim 1, 2 or 3, characterised in that the first deflection means comprise a plurality of parallel, spaced-apart electrodes extending transverse to the first path and disposed on, or adjacent to, the rear wall.
Claim 6
Dependent Claim
43 words
A display tube as claimed in any one of Claims 1 to 4, characterised in that the electron beam producing means produces a single electron beam and in that the electron multiplier comprises a single column of channels extending heightwise of the module.
Claim 7
Dependent Claim
28 words
A display tube as claimed in Claim 5, characterised in that means are provided for centring the electron beam in the module when travelling along its first path..
Claim 8
Dependent Claim
56 words
A display tube as claimed in any one of Claims 1 to 4, characterised in that the electron beam producing means produces three electron beams, in that the electron multiplier comprises three parallel columns of channels extending heightwise of the module, and in that a shadow mask is provided adjacent to, but spaced from, the screen.
Claim 9
Dependent Claim
61 words
A display tube as claimed in Claim 1 or Claim 4 when appended to Claim 1, characterised in that the electron multiplier comprises a matrix of channels extending heightwise of, and for substantially the entire width of, the module and in that the second deflection means is arranged to scan the electron beam across an input face of the electron multiplier.
Claim 10
Dependent Claim
32 words
A display tube as claimed in any one of Claims 1 to 8, characterised in that means are provided for refocusing the or each electron beam when passing along its first path.
Claim 11
Dependent Claim
37 words
A display tube as claimed in any one of Claims 1 to 9, characterised in that beam indexing means are provided for sensing the electron beam when in the vicinity of the support means and the screen.