Image display tube having a channel plate electron multiplier

Details Image display tube having a channel plate electron multiplier Image display tube having a channel plate electron multiplier

1981-12-03

1985-04-16

Moore, David K.

Electric lamp and discharge devices

Cathode ray tube

Secondary emissive electrode

313105CM, 313106, H01J 3148, H01J 4328

Patent

active

045118221

ABSTRACT:
The image contrast in an image display tube having a channel plate electron multiplier (2) is improved by preventing secondary electrons emitted from the face of an input dynode (26) from straying to channels located at a relatively large distance from their origin. This is done by disposing a grid (24) at a short distance from the input dynode (26). If the grid (24) is held at a positive voltage relative to the input dynode (26), stray secondary electrons will be attracted toward the grid (24). Alternatively, if the grid (24) is held at a negative voltage relative to that of the input dynode (26), the secondary electrons will be induced to enter channels close to their origin.

REFERENCES:
patent: 3860849 (1975-01-01), Schagen et al.
patent: 4023063 (1977-05-01), King et al.
patent: 4023064 (1977-05-01), Schagen et al.
patent: 4034254 (1977-07-01), King et al.
patent: 4079286 (1978-03-01), Popp
patent: 4422005 (1983-12-01), Washington et al.

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