KR100351809B1 - in-line electron gun for a braun-tube - Google Patents

Abstract

The present invention improves the structure of the electron gun so that all electron beams are positively focused in the horizontal and vertical directions at the periphery of the screen without a separate voltage input outside the cathode ray tube.

The present invention for this purpose is formed by two to six focusing electrodes to focus the electron beam by a predetermined amount of 1 to 6 prefocus lenses, and formed by the focusing electrode and the anode electrode main lens for focusing the electron beam on the screen In the electron gun consisting of,

Two to six electrodes are formed between the prefocus lens and the main lens to receive a dynamic voltage, the voltage of which is increased toward the periphery of the screen by the amount of deflection yoke of the deflection yoke.

At the same time, except for the electrode, which is formed between the prefocus lens and the main lens and receives a differential voltage waveform, the voltage of which is increased according to the amount of movement when deflected from the left side to the right side of the screen separately from the dynamic voltage. 6 electrodes are comprised.

At the same time, there is provided an inline electron gun for cathode ray tubes, which is formed between the prefocus lens and the main lens and is applied with a constant voltage lower than the anode voltage, except for the electrode.

Description

In-line electron gun for a braun-tube

The present invention relates to a cathode ray tube, and more particularly to an inline electron gun for a cathode ray tube.

In general, each electrode of the in-line electron gun for a cathode ray tube is directed to a path through which the electron beam passes so that the electron beam 13 generated from the cathode 2 can be controlled in a constant intensity to reach the screen 15. They are positioned at regular intervals from each other to be vertical.

As shown in FIG. 1, the first electrode 3, which is a common lattice of three cathodes 2 that are independent of each other, and three cathodes disposed at a predetermined distance from the cathode, is spaced apart from the first electrode. The second electrode 4, the third electrode 5, the fourth electrode 6, the fifth-first electrode 7a, the fifth-second electrode 7b and the sixth electrode 8 are sequentially arranged; In addition, a cathode ray tube is formed on the sixth electrode 8 including a shield cup 9 having a BSC (bulb space connecter) 10 attached thereto.

The cathode ray tube made as described above performs the following operation.

The cathode is heated by a heater 12 embedded in the cathode 2 to emit hot electrons (electron beams) 13 from the cathode, and the hot electrons are controlled by the first electrode 3 which is a control electrode. Accelerated by the accelerating second electrode 4 and passes through a shadow mask 14 through the fifth-second electrode 7b and the sixth electrode 8 which are main lens forming electrodes, and finally Impingement on the screen 15 causes the fluorescent surface to emit light to reproduce an image. The deflection yoke 11 is positioned at the neck to deflect the electron beam 13 emitted from the electron gun to the entire screen 15.

Meanwhile, as shown in FIG. 2, the first embodiment of the inline electron gun for a cathode ray tube according to the related art is as follows.

The fifth electrode 7 is separated into a 5-1 electrode 7a and a 5-2 electrode 7b, and on the electrode surface of the 5-2 electrode 7b facing the cathode 2, A horizontal partition wall 18 horizontal to the direction of the electron beam 13 is positioned, and common to the R, G, and B beams 13 on the electrode surface facing the sixth electrode 8 of the 5-1st electrode 7a. A ball-shaped rim 17 is formed, and three balls through which the R-beam 13a, the G-beam 13b, and the B-beam 13c pass through the 5-1 electrode 7a, respectively. The plate 16 having the structure is positioned, and the horizontal bulkhead 18 of the 5-2 electrode 7b is inserted into the rim 17 of the 5-1 electrode 7a.

The inline electron gun made as described above performs the following operation.

As shown in FIG. 2, a quadrupole lens is formed on the fifth-1 electrode 7a and the fifth-2 electrode 7b.

The intensity of the quadrupole lens is changed by a dynamic voltage synchronized with a deflection current.

Referring to Figure 3 the lens operation in more detail as follows.

When the R, G, and B beams 13 are deflected to the edges of the screen, the deflection current of the deflection yoke 11 which gives the deflection force to the R, G, and B beams is generated the highest (see b). At this time, the quadrupole lens acts the largest.

On the other hand, when the R, G, and B beams 13 are deflected to the center of the screen, a deflection current of the deflection yoke 11 which gives a deflection force to the R, G and B beams is hardly generated (a At this time, the quadrupole lens acts the smallest.

On the other hand, the following phenomenon occurs in the in-line electron gun is not provided with the quadrupole lens.

When the R, G, and B beams 13 are deflected to the periphery of the screen, the horizontal spot diameter is enlarged at the same time due to the non-uniform magnetic field of the self-convergence deflection yoke, and the vertical spot diameter is focused to produce a hollow phenomenon. Generated, resulting in focus deterioration around the screen.

That is, the above phenomenon is a phenomenon in which the focusing force for focusing the R, G, and B beams 13 in the horizontal direction (in-line direction) is weakened by a deflection non-uniform magnetic field, R, in the vertical direction (direction perpendicular to the in-line direction), The focusing force for focusing the G and B beams 13 is enhanced by a deflection non-uniform magnetic field.

Therefore, a quadrupole lens is formed to solve the above-mentioned problem caused when the R, G, and B beams 13 are deflected to the periphery of the screen, and the vertical focusing force is weakened by the quadrupole lens to prevent the entire screen. Excellent focus on 15 has been achieved.

However, although the voltages required for the R, G, and B beams 13 to be focused must be different from each other, technical limitations have not been achieved.

Therefore, when the G beam 13b is focused at the periphery of the screen, a hollow phenomenon (see a in FIG. 4) is caused by the R beam 13a at the right side of the screen relative to the electron gun and is caused by the B beam 13c. The blooming phenomenon is induced (see c in FIG. 4), and the hollow phenomenon is caused by the B beam 13c (see a in FIG. 4) at the periphery of the screen positioned on the left side with respect to the electron gun (see a in FIG. 4), and by the R beam 13a. Blooming phenomenon was induced (see Fig. 4c), the focus quality was reduced.

This phenomenon causes the R beam 13a to focus on the G beam 13b before it reaches the screen 15 when the R, G and B beams 13 are deflected to the right periphery of the screen with respect to the electron gun. This is because the B beam 13c is focused through the screen.

When the R, G, and B beams 13 are deflected to the left edge of the screen with respect to the electron gun, the B beam 13c is focused on the G beam 13b before reaching the screen 15. This is because the R beam 13a is focused beyond the screen 15.

As a result, when the R, G, and B beams 13 are deflected toward the right side of the screen with respect to the electron gun, the R beams 13a of the three beams 13 are overfocused and the B beams 13c are unfocused.

When the R, G, and B beams 13 are deflected to the left periphery of the screen with respect to the electron gun, the R beams 13a of the three beams 13 are unfocused and the B beams 13c are over focused. It causes deterioration.

On the other hand, as shown in Figure 4, the second prior art of the electron gun is proposed as to improve such a phenomenon is configured as follows.

A fifth electrode 20 separated into a 5-1 electrode 20a, a 5-2 electrode 20b and a 5-3 electrode 20c, the 5-1 electrode and the 5-2 electrode Stepped first burring portions 21 are formed on the electrode surfaces facing each other so as to have different depths according to the R, G, and B beams 13.

In addition, a section in which the dynamic electrode portion 22 of the fifth electrode 20c is inserted into the fifth electrode 20b and overlaps the dynamic electrode portion occurs in the fifth electrode. In this section, a rectangular second burring portion 23 perpendicular to the beam 13 direction is formed.

The 5-1 electrode 20a receives a static voltage, the 5-3 electrode 20c receives a dynamic voltage, and the 5-2 electrode 20b receives the 5-1 electrode ( Voltage is applied through a resistor 26 connected to 20a).

The prior art second embodiment made as described above performs the following operations.

When the R, G, and B beams 13 deflect toward the right side of the screen, a strong focusing lens is formed on the B beam 13c and a weak focusing lens is formed on the R beam 13a. When the R, G, and B beams 13 deflect to the left periphery of the screen, a strong focusing lens is formed on the R beam and a weak focusing lens on the B beam.

However, since the ordinary in-line color electron gun is implemented with electrodes having three balls on a common electrode, the intensity of the R beam 13a, G beam 13b, and B beam 13c varies depending on the deflection. In order to implement an electrostatic lens, an asymmetric electrode is formed around a ball through which the three beams 13 pass, and a separate dynamic voltage synchronized with deflection outside the cathode ray tube is applied to the asymmetric electrode to surround the three beams 13. The intensity of the different electrostatic lenses produced should be able to vary depending on the direction of the deflected beam.

In order to achieve this, it is possible to improve only when the electrode shape of the electron gun is changed and a special waveform voltage is applied.

As a special dynamic waveform forming method for implementing such a system, there is a method of adding a terminal to a cathode ray tube stem portion (not shown) to add a circuit for implementing a separate dynamic waveform applied to the terminal to the outside. The case cannot be applied to the existing chassis.

Therefore, in order to use the existing chassis as it is, a device for enabling the above operations must be implemented in the cathode ray tube.

By this reason, the electron gun structure inventing the voltage waveform required by forming a differential circuit in the electron gun itself has been invented.

Referring to FIG. 6 in which an electron gun is equivalently modeled electronically, and FIG. 5 showing the configuration of the electron gun, the following description will be made.

The parasitic capacitance component 27 formed by the internal burring portion 24 of the 5-2 electrode 20b, the dynamic electrode portion 22 of the 5-3 electrode 20c, and the 5-1. The resistors 26 between the electrode 20a and the 5-2 electrode 20b are connected in series to form a closed circuit to differentiate the dynamic voltage applied to the 5-3 electrode to the 5-2 electrode. One voltage waveform is applied.

The resistance component of the resistor 26 is referred to as R, the parasitic capacitance component between the 5-2 electrode 20b and the 5-3 electrode 20c is referred to as C, and the magnitude of the voltage across the resistor is {V} _ {o} and assuming that the dynamic voltage applied to the 5-3 electrode 20c is {V} _ {i}, the voltage across the resistor {V} _ {o } The size of

( A, A: amplitude of dynamic waveform)

Therefore, if the product of the resistance size R of the resistor 26 and the size C of the parasitic capacitance component 27 is sufficiently smaller than the period 1 / ω of the dynamic waveform, a differential voltage waveform can be obtained as shown in FIG. 8.

At this time, the amplitude of the differential voltage waveform Therefore, by selecting an appropriate R value, the magnitude of the differential voltage waveform applied to the 5-2 electrode 20b can be controlled.

As shown in FIG. 7, when the R, G, and B beams 13 are deflected to the left of the screen, the potential V2 of the 5-2 electrode 20b is reduced by the differential voltage waveform. When the R, G, and B beams 13 are deflected toward the right side of the screen, the potential is lower than the potential V1 of the -1 electrode 20a, and is higher than the potential V1 of the 5-1 electrode. A weak electrostatic focusing lens is formed between and the 5-2 electrode.

The intensity of the electrostatic focusing lens formed at this time is different between the three beams.

The reason is that the depth of the burring portion of the fifth-first electrode 20a is the deepest on the B-beam 13c side, the deepest on the G-beam 13b side, and the shallowest on the R-beam 13a side. This is because a burring portion is formed on the fifth electrode 20b and vice versa.

Therefore, when the R, G, and B beams 13 are deflected to the left of the screen, the electrostatic focusing lens is formed on the R beam side 13a by the deep burring portion of the fifth-2 electrode 20b having a low electric potential. Has a stronger focusing action than the electrostatic focusing lens formed on the B-beam 13c and the G-beam 13b.

When the R, G, and B beams 13 are deflected toward the right side of the screen, the electrostatic lens formed on the B beam side 13c by the deep burring portion of the fifth-1 electrode 20a having a low electric potential is an R beam. The focusing effect is stronger than that of the electrostatic focusing lens formed on the 13a and G beams 3b.

In conclusion, when the R, G, and B beams 13 are deflected to the left or the right of the screen 15, a relatively outage of the three beams 13 is stronger than the beam located relatively to the center of the screen. Focusing lens effect, the beam located in the center of the screen receives the weakest electrostatic focusing lens effect.

However, the prior art has the following problems.

As shown in FIG. 5, the second embodiment of the conventional electron gun has a lens strength of the left side of the screen in the dynamic lens formed between the 5-2 electrode 20b and the 5-3 electrode 20c. Problems that appear larger than the lens strength of the right side of the screen occurred.

In addition, a difference in focus occurs in the G beam 13b due to the difference in lens intensities of the left and right parts.

This problem is a phenomenon due to the difference between the dynamic voltage and the derivative voltage as shown in FIG.

In order for the R beam 13a, the G beam 13b, and the B beam 13c to compensate for the difference in focusing characteristics between the left and right sides of the screen, the 5-1 electrode 20a and the 5-2 electrode 20b of FIG. 5 are compensated for. The lens strength should be large), and the difference between the maximum value and the minimum value of the differentiated voltage is only about 500V when the dynamic voltage is 500V, so a method for increasing the strength of the lens is needed.

In the case of the second embodiment shown in Fig. 5, which is a prior art, it is difficult to increase the strength of the lens, and a structure capable of exhibiting sufficient lens action even at a low potential difference is required.

The present invention has been made to solve the problems of the prior art, and the object of the present invention is to improve the structure of the electron gun so that all electron beams are positively focused in the horizontal and vertical directions at the periphery of the screen without a separate voltage input outside the cathode ray tube. .

1 is a configuration diagram showing the configuration of a typical cathode ray tube.

2 is a first embodiment of an electron gun according to the prior art;

3 is a horizontal dynamic waveform diagram of an electron gun according to the prior art.

Figure 4 is a shape diagram showing the degradation of the electron beam spot shape according to the prior art.

5 is a second embodiment of an electron gun according to the prior art.

6 is a circuit diagram showing an electronic circuit equivalent model of the electron gun according to the prior art.

7 is a waveform diagram illustrating a dynamic waveform applied to an electron gun according to the prior art.

8 is a configuration diagram showing the configuration of an electron gun according to the present invention;

Explanation of symbols for main parts of the drawings

7, 20, 30: focusing electrodes 8, 19, 36: anode electrodes

31: fifth focusing electrode 32: fourth focusing electrode

33: third focusing electrode 34: second focusing electrode

35: first focusing electrode 40: electron beam

40a: R beam 40c: B beam

The present invention for achieving the above object is formed by two to six focusing electrodes to focus the electron beam by a predetermined amount, and 1 to 6 prefocus lenses, and formed by the focusing electrode and the anode electrode to focus the electron beam on the screen In the electron gun composed of a main lens for

Two to six electrodes are formed between the prefocus lens and the main lens to receive a dynamic voltage, the voltage of which is increased toward the periphery of the screen by the amount of deflection yoke of the deflection yoke.

At the same time, except for the electrode, which is formed between the prefocus lens and the main lens and receives a differential voltage waveform, the voltage of which is increased according to the amount of movement when deflected from the left side to the right side of the screen separately from the dynamic voltage. 6 electrodes are comprised.

At the same time, there is provided an inline electron gun for cathode ray tubes, which is formed between the prefocus lens and the main lens and is applied with a constant voltage lower than the anode voltage, except for the electrode.

Referring to the drawings to describe the above content in more detail as follows.

8 is a configuration diagram showing the configuration of an electron gun according to the present invention.

As shown in Fig. 8, the inline electron gun is configured as follows.

Separated into a 5-1 electrode 31, a 5-2 electrode 32, a 5-3 electrode 33, a 5-4 electrode 34, and a 5-5 electrode 35 And a fifth electrode 30 and a fifth electrode 5-5 and a fifth electrode 5c and a fifth electrode 20c of the prior art illustrated in FIG. 5. It has a form similar to

At the same time. The R-beam 40a portion of the beam passing hole portion 33a of the 5-3 electrode 33 is the thinnest, the B-beam 40c portion is thickest and formed in multiple stages, and the 5-2 electrode ( The shape of the beam passing hole 32b formed on the surface facing the 5-3 electrode of the 32 is similar to that of the beam passing hole 34b formed on the surface facing the 5-3 electrode of the 5-4 electrode 34. The R-beam 40a passage hole has the longest burring, and the B-beam 40c passage hole has the shortest burring.

At the same time, three through-holes and a horizontal partition wall 32a are formed in the surface of the 5-2 electrode 32 facing the 5-1 electrode 31, and the fifth of the 5-1 electrode 31 is formed. One open portion 31a common to the three beams is formed on the surface facing the −2 electrode 32.

In addition, the voltage connection of the electrodes of the present invention is similar to the prior art illustrated in FIG. 5, and the present invention of FIG. 7 also uses the 5-3 electrode (5-3) to form a differential voltage on the 5-4 electrode 34. 33) and a resistor 51 is formed between the 5-4 electrode to form a parasitic capacitance component (see 27 in FIG. 5) between the 5-4 electrode and the 5-5 electrode 35.

In addition, a differential voltage is applied by electrically connecting the 5-4 electrode 34 and the 5-2 electrode 32 so that the same voltage is applied, and the 5-5 electrode 35 The dynamic voltage 53 is applied by electrically connecting the same voltage to the 5-1 electrode 31 and a constant focus voltage 52 is applied to the 5-3 electrode.

The inline electron gun made as described above performs the following operation.

A lens having a conventional lens action is formed between the 5-4 electrode 34 and the 5-5 electrode 35, and the 5-1 electrode 31 and the 5-2 electrode 32 are formed. ) To form a lens having an action opposite to that of the lens action.

Therefore, the dynamic lens action is weakened on the left side of the screen. The dynamic lens action is weakened on the right side of the screen.

In addition, in order to reinforce the strength of the lens formed between the 5-1 electrode 20a and the 5-2 electrode 20b, which is another problem of the second embodiment of the conventional electron gun, the 5-3 electrode 53 according to the present invention. ) And a lens formed between the 5-2 electrode 32 and the 5-3 electrode 53 together with a lens formed between the 5-4 electrode 54. . Therefore, a lens structure capable of increasing the intensity of the lens by two or more times even with the same potential difference is formed.

As a result, a lens action that satisfies even a CRT with a large screen can be obtained, thereby improving focus in all areas.

As described above, the present invention reduces the phenomenon that the dynamic lens action is strengthened on the left side of the screen and enhances the phenomenon that the dynamic lens action is weakened on the right side of the screen, thereby achieving excellent focus in the entire area of the screen. have.

In addition, the lens may have the same action as that of the lens between the 5-2 electrode and the 5-3 electrode, together with the lens formed between the 5-3 electrode and the 5-4 electrode. A lens can be formed.

Therefore, the lens strength can be increased by more than two times even with the same potential difference, so that a lens action that can satisfactorily satisfy a CRT having a large screen can be obtained.

Claims (5)

In the electron gun consisting of 1 to 6 prefocus lenses formed by 2 to 6 focusing electrodes to focus the electron beam by a predetermined amount, and a main lens formed by the focusing electrode and the anode electrode to focus the electron beam on the screen , 2 to 6 electrodes formed between the prefocus lens and the main lens and receiving a dynamic voltage, the voltage of which is increased toward the periphery of the screen by the amount of deflection yoke of the deflection yoke; At least 2-6 except for the electrode, which is formed between the prefocus lens and the main lens and receives a differential voltage waveform in which voltage is increased according to the amount of movement when the signal is deflected from the left side to the right side of the screen separately from the dynamic voltage. Electrodes and In-line electron gun for cathode ray tube, characterized in that composed of at least one to six electrodes excluding the electrode is formed between the prefocus lens and the main lens to receive a constant voltage lower than the anode voltage. The method of claim 1, 2 to 6 dynamic lenses formed between the electrode to which the dynamic voltage is applied and the electrode to which the differential voltage waveform is applied; 2 to 6 compensation lenses are formed between the electrodes to which the differential voltage waveform is applied and the electrode to which a constant voltage lower than the anode voltage is applied to compensate for the difference between the left and right sides of the screen of the R and B beams. Inline electron gun for cathode ray tube. The method of claim 2, Dynamic lenses; 1 to 6 dynamic lenses formed to prevent the electron beam from being hollowed around the screen; Characterized in that it comprises 1 to 6 dynamic lenses formed to compensate for the focusing difference between the left and right of the screen for the three electron beams generated by the supply of a separate voltage waveform to the 1-6 electrodes of the dynamic lens Electron gun for cathode ray tube. The method of claim 1, In the main lens unit, a positive electrode to which a positive high voltage is applied, and a first focusing electrode to which a dynamic voltage is applied, in which a voltage changed in synchronization with an electron beam deflection is superimposed on a DC voltage lower than the high positive voltage, A third focusing electrode to which a DC voltage lower than a high anode voltage is applied to the electron beam generating part of the first focusing electrode; A second focusing electrode is formed between the first focusing electrode and the third focusing electrode by dividing a resistor disposed in the focused tube and the first focusing electrode, and the second focusing electrode is the same as the second focusing electrode on the cathode side of the third focusing electrode. Install a fourth focusing electrode electrically connected, A fifth focusing electrode electrically connected to the first focusing electrode is disposed adjacent to the prefocus forming electrode on a cathode side of the fourth focusing electrode, A lens opposite to the horizontal and vertical focusing of the lens formed between the first focusing electrode and the second focusing electrode is formed between the fourth focusing electrode and the fifth focusing electrode, An inline electron gun for a cathode ray tube, wherein a lens identical to an action of a lens formed between a second focusing electrode and a third focusing electrode is formed between a third focusing electrode and a fourth focusing electrode. The method of claim 4, wherein And said third focusing electrode has the thinnest thickness for the R beam and the thickest periphery thickness for the B beam.