| 摘要 |
A field emission cathode (40) and a light source (10) including a field emission cathode (40). The field emission cathode (40) includes a base body, and field emitting bodies in the form of fibres (42), attached to the base body. The fibres (42) have field emitting surfaces at their free ends, and the base body is a longitudinally extending core (41) formed by at least two wires (43) between which the fibres (42) are secured. The fibres (42) are distributed along at least a part of the length of the core (41) and extend radially outwards from the core (41). The light source comprises an evacuated container having walls, at least a portion of which consists of an outer glass layer (23, 23') which on at least a major part thereof is coated on the inside with a layer of phosphor (24, 24') forming a luminescent layer, and a conductive layer (25, 25') forming an anode. The layer of phosphor (24, 24') is excited to luminescence by electron bombardment from a field emission cathode (40, 40') located in the interior of the container. A modulator electrode (30, 30') is arranged between the cathode (40, 40') and the anode (25, 25') for creating the electrical field necessary for the emission of electrons. The field emission cathode (40, 40') includes a base body, and field emitting bodies in the form of fibres (42, 42'), attached to the base body, and the fibres (42, 42') have field emitting surfaces at their free ends.
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