One-pin dynamic electron gun for a cathode ray tube

Details One-pin dynamic electron gun for a cathode ray tube One-pin dynamic electron gun for a cathode ray tube

1999-11-22

2002-09-24

Patel, Ashtok (Department: 2879)

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

C313S412000, C315S368150

Reexamination Certificate

active

06455995

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a one-pin dynamic electron gun for a cathode ray tube having an improved voltage efficiency applied to its dynamic electrode.
2. Description of the Related Art
As a way to reduce power consumption of a cathode ray tube, a neck having a smaller diameter has been used and, as a result, there is not much room to install a stem pin, which required a one-pin type dynamic electron gun.
FIG. 1
illustrates a conventional one-pin dynamic electron gun.
FIG. 2
shows a schematic diagram of the electron gun shown in FIG.
1
. It is composed of a cathode
11
emitting electrons and a plurality of electrodes G to focus and accelerate the emitted electrons. G
1
, G
2
, G
3
, G
4
, G
5
−
1
, G
5
−
2
and G
6
are a control electrode, screen electrode, first focus electrode, second focus electrode, third focus electrode, fourth focus electrode and anode electrode, respectively. Ec
1
, Ec
2
, Vf+Vd, and Eb represent voltages applied to the corresponding electrodes.
In the above electron gun, Vd is supplied from an external voltage source and the effective voltage Vd (eff) between the third focus electrode G
5
−
1
and the fourth focus electrode G
5
−
2
is equal to Vd−Vg, where Vg has a gain and phase difference &phgr; with respect to Vd according to the following formula 1:
Vg
=
Vd
⁢
1
+
(
ω
⁢
 
⁢
C1R1
)
2
1
+
ω
2
⁡
(
C1
+
C2
)
2
⁢
R1
2
φ
=
tan
-
1
⁢
 
⁢
-
ω
⁢
 
⁢
C2R1
1
+
ω
2
⁢
C1
⁡
(
C1
+
C2
)
⁢
R1
2
[
Formula
⁢
 
⁢
1
]
where C
1
represents capacitance between the third focus electrode G
5
−
1
and the fourth focus electrode G
5
−
2
due to the distance between them, and C
2
represents capacitance between the second focus electrode G
4
and the third focus electrode G
5
−
1
due to the distance between them and has a similar value to C
1
. Assuming C
1
=C
2
, for a horizontal deflection signal of 64 KHz in frequency, Vg is equal to one half of Vd and the effective dynamic voltage Vd (eff)=Vd−Vd/2=Vd/2. This implies that power efficiency of Vd delivered between the third and fourth electrodes is only 50%. And there is almost no phase difference, i.e., 0.14 degree. Although a dynamic voltage according to the vertical deflection signal is currently not supplied from the external source, if it is to be in the future, Vg will be 0.95 Vd for a 60 Hz vertical deflection signal, meaning that the power efficiency is only 5%, resulting in the electrodes failing to function as a quadrupole lens.
SUMMARY OF THE INVENTION
To solve the above problems, it is an objective of the present invention to provide a first objective of the present invention is to maximize power efficiency of a voltage signal applied to a dynamic electrode of an electron gun.
A dielectric is installed between the second focus electrode and third focus electrode in a one-pin dynamic electron gun assembly in order to increase capacitance between the two electrodes. The increased capacitance between the two electrodes reduces the voltage Vg therebetween and increases the effective voltage Vd (eff) between the third focus electrode and fourth electrode since Vd (eff) =Vd−Vg.


REFERENCES:
patent: 4032811 (1977-06-01), Schwartz et al.
patent: 4181870 (1980-01-01), Stevens
patent: 5250875 (1993-10-01), Kho
patent: 5895303 (1999-04-01), Kimura et al.
patent: 2001/0050526 (2001-12-01), Miyamoto et al.

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