Projection tube
A projection tube and projection technology, applied in the field of projection tubes, can solve problems such as increased light spot size, poor definition, and impact on projection effects, and achieve the effects of enhanced pre-focusing, improved voltage resistance, and reduced amplification factor
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[0018] The accompanying drawings are specific embodiments of the present invention.
[0019] The content of the present invention will be further described below in conjunction with the accompanying drawings.
[0020] refer to figure 1 , 2 As shown, a phosphor film 1 is coated on the negative curved screen of the glass bulb 2, a graphite layer 3 is coated on the neck of the projection tube, an aluminum film 4 is coated in the tube, an electron gun 5 is installed at the tail of the cone, and the electron gun 5 is again It includes a modulation electrode G1, a cathode K is arranged in front of the modulation electrode G1, an accelerating electrode G2 is arranged behind the modulation electrode G1, a first anode electrode G3 is arranged behind the accelerating electrode G2, and a focusing electrode G4 is arranged behind the first anode electrode G3 , a second anode electrode G5 is arranged behind the focusing electrode G4, and the ports of the accelerating electrode G2, the fir...
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