JPH03283236A - Color image-receiving tube set - Google Patents

Abstract

PURPOSE:To equalize the strength of each of plural lenses formed between a first focusing electrode and a second focusing electrode when electron beams are being deflected to the peripheral focused portions of an image plane so as to align the focusing characteristics of all the electron beams with one another by forming a central electron beam-passing hole being made in the end plane of the second focusing electrode in a crosswise long shape over that of each of both side electron beam passing holes in the end plane. CONSTITUTION:A central electron beam-passing hole 15b in the end plane of a second focusing electrode 15 is formed in a crosswise long shape over that of each of both-side electron beam passing holes 15a, 15c in the end plane. A constant focusing voltage EF(C) is impressed upon a first focusing electrode 14 while such a parabolic waveform dynamics focusing voltage FE(D) as being lowest in wave level at each of the cyclically focused central portions 21a, 21b of an image plane and being highest in wave level at each of the cyclically focused peripheral portions 22a, 22b thereof is impressed upon the second focusing electrode 15. In this condition, electron beams are emitted respectively from three cathodes 11a, 11b, 11c so that the deformation of each of the electron beams given by a deflecting magnetic field is canceled to exert power restoring the deformation of the electron beam to the normal shape between the first focusing electrode 14 and the second focusing electrode 15. This power deforms an electron beam 51 in a lengthwise long.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a color picture tube device equipped with an in-line electron gun, and more particularly to an improvement of an electron lens for focusing an electron beam of an electron gun. .

[Prior Art] Generally, the focusing performance on the screen of a picture tube is good at the center of the screen and deteriorates toward the periphery of the two screens. This is because the distance from the main lens of the electron gun to the periphery of the screen is longer than the distance from the center of the screen, and the electron beam is overfocused at the periphery of the screen. This is because the electron beam is subject to deflection aberration due to the influence of the deflection magnetic field.

The above will be explained with reference to the drawings.

Figure 9 shows an electron beam (3
This electron beam (31) is acted upon by horizontally expanding forces (32a), (32bl) and vertically contracting forces (33al, (33bl). As shown in the figure, an overfocused halo (42) of the electron beam (31) is generated in the vertical direction at the periphery of the picture tube screen (41), and this overfocused halo (42) forms around the screen (41). This leads to an enlargement of the beam spot diameter at the periphery and deteriorates focus performance.

In order to solve this problem of deterioration of focus performance in the periphery of the screen, a color picture tube device having a configuration as disclosed in, for example, Japanese Unexamined Patent Publication No. 63-91939 has been known.

FIG. 11 is a perspective view showing the configuration of an in-line electron gun in the conventional color picture tube device disclosed in the above-mentioned publication, in which (lla) and (Ilb) are shown.

(11c) is three cathodes arranged in a straight line in the horizontal direction, (12) is an electrode for controlling electron flow, and (13) is an electrode for drawing out electron flow.

(14) is the first focusing electrode, (15) is the second focusing electrode,
The first and second focusing electrodes (14), (15) have three electron beam passing holes (14a), (14b), (1
4c) and (15a), (15b), (15
c), a constant focus voltage E F (C) is applied to the first focusing electrode (14) as shown by the dashed line in FIG. 12, and the second focusing electrode (15) As shown by the solid line in FIG. 12, as the deflection angle of the electron beam increases, the focus voltage EF(C) is gradually increased as the lower limit, that is, at the center of the screen (21a).
, (21b), the lowest one screen peripheral area (22a), (
22b) is configured so that a parabolic waveform dynamic voltage E F (D) that changes to reach its highest level is applied.

(1B) is an anode, and the opposite end faces of this anode (16) and the second focusing electrode (15) have three circular electron beam passing holes (1!3a), (19b), and (19c), respectively.
) and (20a), (20b), (20c)
is drilled.

Next, the operation of the above configuration will be explained.

A constant focus voltage E F on the first focusing electrode (14)
(C) and a dynamic voltage E F (D) with a parabolic waveform to the second focusing electrode (15), the three cathodes (lla), (flb), (li
When electron beams are emitted from e), the flow of these electron beams is controlled by the electron flow control electrode (12), and then accelerated by the electron flow extraction electrode (13) and emitted.

Then, when the electron beam is deflected to the periphery of the screen, the electron beam is focused only in the horizontal direction between the first focusing electrode (14) and the second focusing electrode (15);
The lens action of the main lens formed between the second focusing electrode (15) and the anode (16) is weakened to prevent deterioration of focus performance in the peripheral area of the screen.

[Problems to be Solved by the Invention] The conventional color picture tube device is configured as described above, and includes an electron beam passing hole formed in each of the opposing end surfaces of the first focusing electrode and the second focusing electrode. Since each hole is formed independently and the hole formation is the same, the positional relationship between the center electron beam passing hole and the side electron beam passing hole and the shape of the electrodes may cause the difference in the hole size compared to the side electron beam. Therefore, the center electron beam is subjected to a stronger lens action between the first and second focusing electrodes. Therefore, the focus characteristics on the screen are different between the center electron beam and the side electron beams, and as a result, the screen There was a problem in that focus performance could not be sufficiently improved, such as color blurring occurring in the peripheral areas.

This invention was made in order to solve the above-mentioned problems, and when the electron beam is deflected to the periphery of the screen, the focus characteristics of the center and side electron beams are made to be the same, and the electron beams are deflected to the periphery of the screen. An object of the present invention is to provide a color picture tube device that can sufficiently improve the focusing performance of a color picture tube device.

[Means for Solving the Problems] The color picture tube device according to the present invention has a center hole formed in the end face of the second focusing electrode among the opposing end faces of the first and second focusing electrodes of the electron gun. It is characterized in that the electron beam passage hole is formed laterally longer than the side electron beam passage holes.

Further, in the color picture tube device according to the invention described in claim 2, the center electron beam passage hole formed in the end face of the first focusing electrode is formed to be longer than the side electron beam passage holes. Features.

Further, the color picture tube device according to the invention described in claim 3 is characterized in that the plurality of electron beam passing holes bored in the end face of the second focusing electrode are formed in the shape of horizontally long slots. .

[Function] According to the present invention, among the electron beam passing holes formed in the end surface of the second focusing electrode on the first focusing electrode side, the center electron beam passing hole is laterally longer than the side electron beam passing holes. Therefore, the lens effect for the center electron beam is weakened, and the lens effects received by the center and side electron beams can be made equal. Due to this.

It becomes possible to make the focus characteristics of all the electron beams the same, color blurring at the periphery of the screen is removed, and focusing performance at the periphery of the screen can be improved.

Also, in the case of the invention of claim 2, since the center electron beam passing hole formed in the end face of the first focusing electrode is longer than the side electron beam passing holes, the center electron beam is received. By making the lens action weaker than the lens action received by the electron beam at the site, both lens actions can be made equal, and the focusing performance in the peripheral area of the screen can be improved in the same manner as described above.

According to the third aspect of the invention, the electron beam passing hole formed in the end face of the second focusing electrode on the first focusing electrode side is made large regardless of the pitch of the electron beam, so that the electron beam is directed around the screen. It is possible to enlarge the electron lens formed between the first focusing electrode and the second focusing electrode when the electron beam is deflected toward the center of the screen, thereby reducing lens aberration and improving focusing performance at the periphery of the screen. can do.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described based on FIG.

FIG. 5 is a perspective view showing the configuration of an in-line electron gun in a color picture tube device according to an embodiment of the present invention;
Figure 1. Nio Izl, (lla), (llb).

(Ilc) , (+2) ~ (if(), (14a)
, (14b) , (+4c) (15a), (15b
), (15c), (19a), (19b), (19
c) (20a), (20b), (20q), EF(C
) and EF (El) are the same as those in the conventional example shown in FIG. 11, so the island portions are given the same reference numerals and their explanations will be omitted.

Further, the focus voltage E F ((:) applied to the first focusing electrode (14) and the dynamic voltage E F (D) applied to the second focusing electrode (15) are as in the conventional example.
As shown in FIG.

In FIG. 1, the difference from the conventional example shown in FIG.
) and (15c), it is formed in a horizontally elongated shape.

Next, the operation of the above configuration will be explained.

A constant focus voltage E F on the first focusing electrode (14)
(C) is applied to the second focusing electrode (15) as shown in FIG.
lowest at the periphery of the screen (22a), (22b)
Dynamic focus ring [F, FID) of a parabolic waveform such that the height is the highest is applied.

In this state, the three cathodes (!Ia), (Ilb),
By emitting an electron beam from the (llc), the deformation of the electron beam caused by the deflection magnetic field as shown in FIG. It works between the second focusing electrode (15). This force is generated by the electron beam (51
) are horizontally contracting forces (52a), (52bl) and vertically expanding forces (53a), (53b), which deform the electron beam (51) into a vertically elongated shape.

Due to this deformation of the electron beam (51), the electron beam spot is not focused on the core (62a) in the peripheral area of the screen, as shown in FIG.

(62b), (halo f61a in the convergence part of 62cl), f61bl, (61c) appear, and then the main halo formed between the second focusing electrode (15) and the anode (16) appears. By weakening the convergence effect of the lens (not shown), the halos (61a) and (61bl) of the overconvergent portions are formed.

(Since 61cl is removed, the beam spot (71a) is just in focus, as shown in FIG. 4.

f71b) and (71c) can be obtained.

Here, as shown in FIG. 1, the electron beam at the site is transmitted through the first and second focusing electrodes f141. f151 side wall +
+4Al, TI5^), the center electron beam is weakly affected by the lens action between the first and second focusing electrodes ++4), (151) compared to the center electron beam. The beam shape is longer than that of an electron beam.

On the other hand, according to this embodiment, the electron beam passing hole f15bl at the center of the second focusing electrode (15) is longer than the side electron beam passing holes f15a) and (15c), so the lens action at the center is The center electron beam and the side electron beams receive the same lens action, making it possible to obtain uniform focusing characteristics. Therefore, as shown in FIG.
It is possible to make the beam spot (82) at the periphery of the beam spot have the same color blur-free beam spot characteristics as the beam spot (81) at the center.

FIG. 6 is a perspective view showing the configuration of an in-line electron gun in a color picture tube device according to another embodiment of the present invention. In the figure, the differences from the embodiment shown in FIG. 1 are as follows.
The center electron beam passing hole (14b) bored in the end face of the first focusing electrode (14) is formed in a vertically elongated shape compared to the electron beam passing holes (14a) and (14C) on both sides. Electron beam passing holes (15) are formed at the center and both sides of the two focusing electrodes (15).
b), (15a) and (15c) are formed in the same shape, and the other configurations are the same as in Fig. 1, so
The same reference numerals are given to the corresponding parts, and detailed explanation thereof will be omitted.

Next, the operation of the above configuration will be explained.

Basically, it is the same as the embodiment shown in FIG. 1 above, and the center electron beam has a longer beam shape than the side electron beams, and the center electron beam passage hole of the first focusing electrode (14) Since the hole (14b) is longer than the side electron beam passing holes (14a) and (14c), the lens effect at the center is weakened. Therefore, it is possible to obtain uniform focusing characteristics with equal lens action, and it is possible to obtain beam spot characteristics as shown in FIG.

Note that the first focusing electrode (14) of the embodiment shown in FIG.
Each electron beam passing hole (14a), (
14b) and (14c) are not limited to rectangular shapes, but may be a combination of an ellipse and a perfect circle as shown in FIG. It may have any shape as long as it is vertically longer than (14a) and (14c),
It has a similar effect.

FIG. 8 is a perspective view showing the configuration of an in-line electron gun in a color picture tube device according to another embodiment of the present invention. In the same figure, the difference from the embodiment shown in FIG. Three electron beam passing holes (15a), (15b), (15c) formed on the end face of the focusing electrode (15)
consists of one horizontally long throw, T-shaped hole (24), and the rest of the structure is the same as in Figure 1, so the corresponding parts are given the same reference numerals and detailed explanations are provided. omitted.

In the case of the configuration shown in FIG. 8, the beam spot characteristics as shown in FIG. 5 can be obtained by the same effect as in the embodiment shown in FIG.

Here, according to this embodiment, there are three electron beam passing holes (15a) on the end face of the second focusing electrode (15).

(15b) and (15c) are formed in one horizontally long slot-like hole (24),
Three electron beam passing holes (15a), (15b),
(15c) compared to drilling each hole separately.
The diameter of the lens formed between the first focusing electrode (14) and the second focusing electrode (15) is set regardless of the pitch of the electron beam.
Can be made larger.

Therefore, lens aberration can be made smaller, and as a result,
Focusing performance at the periphery of the screen can be further improved.

In the configuration shown in FIG. 8, the horizontally long slot-like hole (24) is not limited to a rectangular shape, but may be elliptical or the like.

[Effects of the Invention] As described above, according to the inventions recited in claims 1 and 2, when the electron beam is deflected to the peripheral part of the screen, the first
By making the strengths of the plurality of lenses formed between the focusing electrode and the second focusing electrode the same, it is possible to make the focusing characteristics of all electron beams the same, thereby eliminating the occurrence of color fringing at the periphery of the screen. This has the effect of improving focus performance in the periphery of the screen.

Further, according to the third aspect of the invention, the electron beam passing hole is enlarged regardless of the pitch of the electron beam, and the first
Since it is possible to reduce the aberration of the electron lens that occurs between the focusing electrode and the second focusing electrode, it is possible to improve the focusing performance in the peripheral area of the screen.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the configuration of an in-line electron gun in a color picture tube device according to an embodiment of the present invention, FIG. 2 is a sectional view of an electron beam explaining the operation, and FIGS. FIG. 5 is an enlarged view showing changes in the shape of the beam spot, FIG. 5 is a view showing beam spot characteristics on the screen, and FIG. 6 is a perspective view showing the configuration of an in-line electron gun in a color picture tube device according to another embodiment of the present invention. Figure 7 is the 6th
FIG. 8 is a perspective view showing the configuration of an in-line electron gun in a color picture tube device according to another embodiment of the present invention, and FIG. 9 is a conventional one. Figure 10 is a cross-sectional view of the electron beam in the case of the example, and Figure 10 is a diagram showing the beam spot characteristics on the screen in the case of the conventional example.
FIG. 1 is a perspective view showing the configuration of an in-line electron gun in a conventional color picture tube device, and FIG. 12 is a waveform diagram of voltage applied to a focusing electrode. (lla), (llb), (llc) --- cathode, (1
2) Electron flow control electrode, (13) Electron flow extraction electrode, (14) First focusing electrode, (15)
--Second focusing electrode, (14a), (14b). (14c), (15a), (15b), (15c)
- Electron beam passing hole, (16)...Anode, (20...
・Slot-shaped hole, (41) ・Screen, (81)・
...Beam spot at the center of the screen, (82)...Beam spot at the periphery of the screen. Note that the same symbols in the figures indicate the same or equivalent parts.

Claims (3)

[Claims] (1) An electron gun including a cathode, an electron flow control electrode, an electron flow extraction electrode, a focusing electrode, and an anode, the focusing electrode being a first focusing electrode to which a constant focusing voltage is applied. In the color picture tube device, the first and second focusing electrodes are divided into an electrode and a second focusing electrode to which a dynamic voltage that changes to a voltage higher than the focusing voltage is applied as the deflection angle of the electron beam increases. A color picture tube device characterized in that a center electron beam passing hole formed in the end face of the second focusing electrode is formed to be laterally longer than side electron beam passing holes among the opposing end faces of the second focusing electrode. (2) An electron gun including a cathode, an electron flow control electrode, an electron flow extraction electrode, a focusing electrode, and an anode, the focusing electrode being a first focusing electrode to which a constant focus voltage is applied. In the color picture tube device, the first and second focusing electrodes are divided into an electrode and a second focusing electrode to which a dynamic voltage that changes to a voltage higher than the focusing voltage is applied as the deflection angle of the electron beam increases. A color picture tube device characterized in that a center electron beam passage hole formed in the end face of the first focusing electrode is formed to be longer vertically than side electron beam passage holes among the opposing end faces of the first focusing electrode. (3) An electron gun including a cathode, an electron flow control electrode, an electron flow extraction electrode, a focusing electrode, and an anode, the focusing electrode being a first focusing device to which a constant focusing voltage is applied. In the color picture tube device, the first and second focusing electrodes are divided into an electrode and a second focusing electrode to which a dynamic voltage that changes to a voltage higher than the focusing voltage is applied as the deflection angle of the electron beam increases. A color picture tube device characterized in that a plurality of electron beam passing holes formed in the end face of the second focusing electrode among the opposing end faces of the second focusing electrode are formed in the shape of horizontally long slots.