摘要 |
The object of the invention is to radiate light towards the outside, improve the luminous efficiency and obtain a high-intensity externally radiated light without hindering the light from being emitted on the entire surface of a phosphor layer. A glass substrate 2 , that forms a light projection window, and a glass substrate 3 , that forms a base bottom surface, are oppositely disposed at a predetermined interval to form a vacuum chamber, an anode electrode 5 is provided at a region at the center of the glass substrate 3 , and a cathode electrode 6 is provided at a region on both sides of the anode electrode 5 . A phosphor layer 7 is formed as a film on the anode electrode 5 , an electron emission source 8 is formed as a film on the cathode electrode 6 , and a gate electrode 9 is arranged above the electron emission source 8 . An electric field is applied to the electron emission source 8 to emit an electron beam and make the electron beam uniformly fall onto the phosphor layer 7 in a parabolic shape to excite the phosphor layer 7 and emit light. Because only a vacuum space lies between the phosphor layer 7 and the glass 2 , the intense light emitted by the excitation surface of the phosphor layer 7 is emitted from the glass substrate 2 towards the outside without any interference and suppresses electric power consumption while significantly increasing the quantity of light.
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