KR910005188Y1 - In-line type electron gun - Google Patents

Abstract

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Description

In-line gun for color tube

1 is a schematic representation of a typical inline electron gun.

2 shows a conventional G ₃ electrode, wherein (a) and (b) are front views of the incident side and the exit side.

3 is an electron gun in which a conventional large-diameter lens is realized, wherein (a) is a sectional view, and (b) is a front view and a sectional view of an electrode forming the main lens.

4 is a partially cutaway perspective view of a G ₃ electrode and a G ₄ electrode of an inline electron gun for a color brown tube according to the present invention.

FIG. 5 is a front view of the emission side of the G ₃ electrode and the entrance side of the G ₄ electrode shown in FIG. ₄ , wherein (a) shows an electron beam forming hole having an elongated through hole in which a short side is a straight line and an long side is an ellipse. b) is an elliptical elongated electron beam through hole formed. (c) is a perspective view of an auxiliary electrode piece.

6 is a cross-sectional view of the G ₃ electrode and the G ₄ electrode shown in FIG.

* Explanation of symbols for main parts of the drawings

L ₃ , L ₄ : Lip S: Failure type auxiliary electrode piece

HRa, HGa, HBa, HRb, HGb, HBb: Electron Beam Passing Holes

The present invention relates to an in-line electron gun for a color brown tube, and more particularly, to an improvement in focus characteristics and lens aberration by improving the structure of an electrode forming a main lens.

In general, in-line type electron gun, the electrons emitted from the cathode (K), as shown in FIG. 1 pre-focused and accelerated as it passes through the pre-focus (prefocus) lens formed in the G ₂ electrode and G ₃ electrode, and G ₃ The main lens formed on the electrode and the G ₄ electrode is finally focused and accelerated to land on the fluorescent surface to form a screen.

However, conventionally formed in the electron gun through hole (HR) (HG) (HB ) formed on the G ₃ electrode on the incident side and the exit side electrode pieces _{(G 3 a) (G 3} b) as shown in FIG. 2 Round Therefore, when the electron beam is deflected to the periphery of the fluorescent surface by the deflection yoke, the shape of the beam spot is distorted horizontally due to the aberration effect of the prefocus lens and the main lens and the geometric curvature of the fluorescent surface.

In addition, the in-line electron gun is designed to concentrate the three-color signal electron beams of R, G, and B at one point of the fluorescent surface according to the specificity of the cathode arrangement method, which is an area where the electron beam is ultimately accelerated and focused. In the main lens system, the outer electron beam, that is, the red and blue beams, should be able to converge so that they can meet the green beam in the center.

As a means for concentrating the electron beam, an eccentric method of causing the outer lens forming hole of the main lens system to be eccentrically outward and a method of assembling the electrode itself obliquely have been used. In order to obtain a constant refraction angle of the electron beam, the converging means as described above is unavoidable in the eccentricity of the lens-forming space of the input and output sides, which has many problems in fabrication and assembly. The image quality deterioration and spherical aberration are improved by overlapping the lens forming holes by forming a large diameter common main lens by the protruding edges GLa GLb around the edge of the electron beam passing plane GPa GPb. According to such a dual main lens system, since the focusing force in the longitudinal and lateral directions with respect to the electron beam passing therethrough is weakened, the focus characteristic is weakened, and the focusing force for each electron beam is also generated. Problems such as difficulty in assembly and assembly accuracy are caused.

Accordingly, an object of the present invention is to improve the aberration and focus characteristics by improving the electrode forming the main lens and thereby to enlarge the lens formed therein, and to provide an inline type electron gun for color-brown tubes with improved convergence. have.

In order to achieve the above object, the present invention provides a prefocus lens, which includes a preposition triode part for prefocusing and accelerating an electron beam and an electrode of a main lens system for final focusing and accelerating the electron beam. At least one of the front and rear electrodes to form a horizontal through-hole through which the R, G, B electron beams pass through, forming a lip of a certain height around the edge of the lip The middle two places are characterized in that the failure type auxiliary electrode pieces are attached to form independent electron beam through holes.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

1 and 4 show a schematic diagram of a general inline electron gun and a G ₃ electrode and a G ₄ electrode according to the present invention, in which electrons emitted from a cathode (K) are converted into a G ₂ electrode and a G ₃ electrode. The prefocus lens is formed by prefocusing and accelerating to form an electron beam, and the electron beam is an electron beam passing hole HR ₃ (HG ₃ ) (HB ₃ ) formed in the incidence side electrode piece G ₃ a of the G ₃ electrode. The electron beam passing hole is formed in a horizontal shape so that the prefocused electron beam receives an diverging force in a vertical direction rather than a horizontal direction to form an ellipse. This is passed through a main lens formed between the electrode ₄ and G emission side electrode pieces (G ₃ b) of the electrode G _3. Here in FIG. 4 and claim of the G ₃ electrode as shown in Fig. 5 also exit side electrode pieces (G ₃ b) G R on the incident side of the _fourth electrode, G, the through-hole of the transverse elongate the B electron beam are both passing ( A ₁ ) (A ₂ ) is formed, and at the edge of each through hole, a lip (L ₃ ) (L ₄ ) is formed and two failed auxiliary electrode pieces in the center of (L ₃ ) (L ₄ ) By attaching (S), an independent electron beam through hole (HRa) (HGa) (HBa) (HRb) (HGb) (HBb) is formed, with the longitudinal axis V being greater than the horizontal axis D (V> D) Formed.

Therefore, the electron beam passing through the main lens formed by the electrodes obtains the effect of the vertical lens and forms a circular shape on the elliptical shape of the beam spot rendered on the fluorescent surface, and can greatly reduce spherical aberration by making the lens large diameter. will be.

In addition, each through-hole (A ₁₎ the lip (lip) and failure type secondary electrode side (S) formed in (A ₂₎ of the G ₃ electrodes of the exit side electrode pieces (C ₃ b) and G ₄ electrode incident side of the The electron beam passing holes HRa (HGa) (HBa) and (HRb) (HGb) (HBb) formed by the HBb are straight lines and the long sides are elliptical elongated shapes (HRa) (as shown in FIGS. It may be formed of HGa) (HBa) or elliptical longitudinal shape (HRb) (HGb) (HBb), and it may be formed on at least one of the front and rear electrodes ie, the G ₃ electrode or the G ₄ electrode which form the main lens. Properties and convergence can be improved.

That is, the lip (lip) (L ₃₎ main lens formed by a fail-type auxiliary electrode attached to the (L ₄₎ formed on the incident side of the exit-side electrode pieces (G ₃ b) and (G ₄₎ of the G ₃ electrode It is possible to improve the convergence which is a problem in the inline electron gun by increasing the deflection of the side beam.

In addition, as shown in FIG. 6, the incident side electrode piece G ₃ a of the G ₃ electrode was formed in a cone type to form a small portion in which the electron beam through hole is formed, thereby improving reliability of the breakdown voltage. Even if the incidence side electrode piece is formed in a plane, the effect of the present invention is the same. In addition, in the above embodiment, it is assumed that the main lens system includes two electrodes G ₃ and G ₄ , but the present invention may be applied to an electron gun in which the main lens system includes a plurality of electrodes.

The present invention as described above improves the electrode of the main lens system, thereby reducing the aberration of the main lens formed thereby improving the focus characteristics and the convergence can be obtained a color CRT of the described image quality.

Claims (1)

An electron gun comprising a preposition tripole portion for preliminary connection and acceleration of an electron beam by forming a prefocus lens and electrodes of a main lens system for final focusing and acceleration of the electron beam, the electron gun comprising: R, G and B electron beams pass through the through-hole (A ₁ ) (A ₂ ) of the horizontal shape, the lip (L ₃ ) (L ₄ ) of a certain height is formed around the edge, In the middle of the lip (L ₃ ) (L ₄ ) by attaching a failure type auxiliary electrode piece (S), independent electron beam through holes (HRa) (HGa) (HBa), (HRb) (HGb) ( In-line electron gun for color tube, characterized in that to form HBb).