JP2003151468A - Saddle type deflection coil for color picture tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively control both of left and right pin cushion distortion and misconvergence without a pincushion distortion correcting circuit in a saddle type deflection coil installed in a color picture tube with a flattened screen surface. SOLUTION: It this saddle type deflection coil, an electron gun side end part and a screen side end part of a pair of deflected magnetic field generating part 4, 4 are connected each other by an electron gun side crossover part 2 and a screen side crossover part 3 respectively. A first sub coil 5 and a second sub coil 6 are arranged at a pair of the deflected magnetic field generating part 4, 4 and an opening part 11 surrounded by the both crossover parts 2, 3, and each sub coil crossover part 51, 61 is formed at a position shifting in a tube axis direction each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a saddle type deflection coil which constitutes a deflection yoke in a color picture tube such as a television receiver.

[0002]

2. Description of the Related Art As shown in FIG. 9, a saddle-type deflection coil has a pair of deflection magnetic field generators (40) (40) extending along the tube axis direction of a color picture tube on the electron gun side and on the screen side. Of the electron gun side crossover part (20) and the screen side crossover part, respectively.
They are connected to each other by (30).

In manufacturing the saddle-type deflection coil (10),
As shown in FIG. 10, a saddle-shaped space S is formed between the molds by combining the female mold (7) and the male mold (8), and the block (70) is arranged in the center of the space. By rotating the mold (7) and the male mold (8), a wire is wound around the block (70). As a result, a saddle type deflection coil (10) having an opening (11) corresponding to the shape of the block (70) is obtained.

By the way, in a color picture tube having an in-line type electron gun structure, left and right pincushion distortion as shown in FIG. 13A and side beam misconvergence as shown in FIG. 13B are suppressed. Therefore, it was designed so that the magnetic field formed by the saddle type deflection coil would be a barrel type (barrel type) magnetic field on the electron gun side and a pincushion magnetic field on the screen side. The shape of the coil is adjusted by providing a pin on the mold so that the pin can be retracted and projecting the pin into the winding.

Further, in a color picture tube having a flat screen surface, sufficient characteristics cannot be obtained even by the above-mentioned measures, and therefore, in order to suppress pincushion distortion and misconvergence, as shown in FIG. There has been proposed a saddle-type deflection coil having a configuration in which the central portions of the edges of the pair of deflection magnetic field generators (40) (40) on the side of the opening (11) project inward as indicated by the chain line. However, in the step of winding the saddle-type deflection coil, it is difficult to push the conductor wire to the position of the chain line, so that there is a problem that the sufficient effect cannot be obtained.

Therefore, as shown in FIG. 12, a part of the conductor wire group forming the electron gun side connecting portion (20) is formed around the opening (11) between the deflection magnetic field generating portions (40) and (40). Sub coil
A saddle type deflection coil is proposed in which (50) is arranged to obtain the same effect as the structure shown by the chain line in FIG.

[0007]

However, in the saddle type deflection coil shown in FIG. 12, when the transition part (52) of the sub-coil (50) is brought close to the screen side transition part (30) in order to improve the convergence, On the contrary, there is a problem that the pincushion distortion increases. In order to suppress the pincushion distortion, it is effective to provide a pincushion distortion correction circuit in the television circuit and correct the distortion by signal processing. However, there is a problem that the cost increases.

There is also known a method of mounting a magnet on the screen-side end of the deflection yoke. In this method, when the correction amount of pincushion distortion becomes large,
Side beam misconvergence occurs. In particular,
The occurrence of misconvergence becomes large at a place close to both ends of the screen (positions at 3 o'clock and 9 o'clock) (intermediate portion between corner of screen and positions at 3 o'clock and 9 o'clock).

Therefore, an object of the present invention is to effectively suppress both left and right pincushion distortion and side beam misconvergence in a color picture tube having a flat screen surface without providing a pincushion distortion correction circuit. To provide a saddle-type deflection coil capable of

[0010]

A saddle type deflection coil according to the present invention comprises a pair of deflection magnetic field generators extending along the tube axis direction.
(4) The electron gun side end and the screen side end of (4) are connected to each other by the electron gun side crossover (2) and the screen side crossover (3), respectively, and a pair of deflections is provided. A part of the conductor wire group forming the electron gun side crossing part (2) is drawn around the opening (11) surrounded by the magnetic field generating parts (4) and (4) and the crossing parts (2) and (3). A plurality of sub-coils are arranged, and the crossovers of the sub-coils are formed at positions displaced from each other in the tube axis direction.

In the saddle type deflection coil for a color picture tube according to the present invention, for example, when two subcoils (5) and (6) are arranged, a subcoil having a crossover on the screen side.
By (6), side beam misconvergence is suppressed. The sub-coil (6) itself increases left and right pincushion distortion, like the sub-coil (50) of the conventional saddle-type deflection coil (12) shown in FIG. In (10), since the sub-coil (5) having the crossover portion is installed on the electron gun side, the winding ratio on the electron gun side is increased by the sub-coil (5), which increases the deflection sensitivity. Therefore, the magnetic field changes into a barrel shape, and the left and right pincushion distortion is suppressed.

In the concrete construction, the crossover portion (51) of the first sub-coil (5) on the electron gun side is about one third to about two minutes of the total length of the deflection magnetic field generating portion (4) along the tube axis direction. 1 is arranged at a position away from the electron gun side crossover part (2), and the crossover part (61) of the second sub-coil (6) on the screen side is about one half to about three minutes of the total length. Electron gun side crossing part only for distance 2 (2)
It is located away from. The first subcoil
By the arrangement of (5), the effect of suppressing the left and right pincushion distortion is increased, and the second sub-coil (6) is provided.
The arrangement described above increases the effect of suppressing side beam misconvergence.

Further, in the concrete structure, both ends of the transition portion (61) of the second sub-coil (6) on the screen side are centered on the tube axis and are in the tube axis direction of the deflection magnetic field generating sections (4) and (4). It is provided at a position which makes an angle of 40 ° to 55 ° with the outer edge extending in the direction. As a result, the deflection magnetic field generator (4) that contributes to the deflection of the second sub-coil (6) is sufficiently extended inward. Also, by forming the second sub-coil (6),
Second sub-coil having the greatest influence on convergence (6)
Since the number of turns of the deflection magnetic field generator (4) in the formation region is larger than the number of turns of the deflection magnetic field generator (4) connected to the screen side transition part (3), left and right pincushion distortion when the convergence is optimized. Is suppressed.

[0014]

According to the saddle type deflection coil according to the present invention,
Even when used in the deflection yoke of a color picture tube with a flat screen surface, it effectively suppresses both left and right pincushion distortion and side beam misconvergence without providing a pincushion distortion correction circuit. Can be done.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment in which the present invention is applied to a 21-inch class flat display having an in-line type electron gun structure will be specifically described below with reference to the drawings.

The saddle type deflection coil according to the present invention is used as a horizontal deflection coil of a deflection yoke, and as shown in FIGS. 1 to 3, a pair of deflections extending along the tube axis direction of a color picture tube. The ends of the magnetic field generators (4) and (4) on the side of the electron gun and the end on the side of the screen are respectively the crossovers (2) on the side of the electron gun.
And the screen side crossover (3) are connected to each other.

In the opening portion (11) surrounded by the pair of deflection magnetic field generating portions (4) and (4) and the connecting portions (2) and (3), a conductor wire group forming the electron gun side connecting portion (2) is formed. A first sub-coil (5) and a second sub-coil (6), which are formed by drawing a part of them, are arranged.

The crossover portion (51) of the first sub-coil (5) is about 1/3 to 1/3 of the total length L of the deflection magnetic field generating portion (4) along the tube axis direction.
It is arranged at a position separated from the electron gun side transition part (2) by a distance of about one half.

The transition part (61) of the second sub-coil (6) is
It is arranged at a position separated from the electron gun side transition part (2) by a distance of about ½ to about ⅔ of the total length, and both ends of the transition part (61) are as shown in FIG. With the tube axis Q as the center, the outer edge of the deflection magnetic field generating unit (4) (4) extending in the tube axis direction and 4
It is provided at a position forming an angle θ of 0 ° to 55 °.

In the manufacturing process of the saddle type deflection coil (1), a winding machine having a pair of winding molds (7) and (8) as shown in FIG. 10 is used, and as shown in FIG. A first sub-coil (5) is formed by winding a conductive wire around a block (70) protruding from one mold, and then a pair of pins (71) (71) is formed from one mold. The second sub-coil (6) is formed by projecting and changing the winding path.

As the winding machine, a vertical winding machine in which the rotating shaft of the mold is vertical is adopted, and the pins are embedded in the lower mold so that the pins can be projected and retracted in the vertical direction. This made the pins appear and disappear smoothly.

In the saddle type deflection coil (1) of the present invention,
Crossover (51) of first subcoil (5) and second subcoil (6)
The position of the transition part (61) of the is optimized as described above,
In this optimization, as shown in FIG. 6 (b), the magnet M is provided in the opening (11) of the saddle type deflection coil having no sub coil.
By arranging, the saddle type deflection coil having the first sub-coil (5) and the second sub-coil (6) is simulated as shown in FIG. 6 (a), and the position of the magnet M is changed in the tube axis direction. The magnitude of convergence and the magnitude of pincushion distortion due to the magnet M were measured. Incidentally, as shown in the drawing, the position of the transition part (51) of the first sub-coil (5) and the second sub-coil
If the magnet M is installed at an intermediate position between the positions of the transition portions (61) of (6), the first and second sub-coils (5) shown in FIG.
The saddle type deflection coil having (6) and the saddle type deflection coil having the magnet M shown in FIG.

FIG. 7 shows a magnet M as shown in FIG. 6 (b).
2 shows measurement results of the magnitude of convergence and the magnitude of pincushion distortion when the position of the magnet M is changed in the tube axis direction in the saddle type deflection coil having the above. The horizontal axis in FIG. 7 is the distance from the position of the electron gun side crossover (2) to the position of the screen side crossover (3),
That is, the total length L in the tube axis direction of the deflection magnetic field generator (4) is divided into 12 equal parts, and the measurement data at five different positions are plotted in FIG. 7, and the change is approximated by a curve.

As is apparent from FIG. 7, the influence on the convergence is maximized when the magnet position is near 5/12 of the total length L, and the pin is located when the magnet position is near 8/12 of the total length. The effect on cushion distortion is the largest. From this, in order to maximize the influence on the convergence and at the same time reduce the influence on the pincushion distortion, the first sub-coil should be used.
The transition part (51) of (5) is installed in the range of about 1/3 to about 1/2 of the total length L, and the transition part (61) of the second sub-coil (6).
It can be said that it is desirable to install the above in the range of about 1/2 to about 2/3 of the total length L.

According to the saddle type deflection coil (1), left and right pincushion distortion is suppressed mainly by the first sub-coil (5), and side beam misconvergence is mainly caused by the second sub-coil (6). Since it is suppressed, there is no need to provide a pincushion distortion correction circuit in the television circuit, and this can reduce the cost.

In order to confirm the effect of the present invention, for a 21-inch flat display, a saddle type deflection coil of the present invention constitutes a deflection yoke, and magnets are arranged on the left and right sides of the deflection yoke. A conventional saddle type deflection coil is used to form a deflection yoke, and magnets are arranged above and below the deflection yoke, and a conventional saddle type deflection coil is used to form a deflection yoke, and the deflection yoke is provided on the left and right sides of the deflection yoke. A conventional example 2 in which a magnet is arranged is manufactured, and a screen center position R is obtained as shown in FIG.
Coordinate position P (180 mm, 135
When the left and right pincushion strain X in mm) was measured, the following results were obtained. The anode voltage was 28 KV.

Example of the Present Invention: X = 0.2 mm Conventional Example 1: X = 9.4 mm Conventional Example 2: X = 5.9 mm As is apparent from these results, according to the saddle type deflection coil of the present invention, The left and right pincushion distortion can be significantly reduced as compared with the conventional saddle-type deflection coil, and thus the pincushion distortion correction circuit can be omitted.

[Brief description of drawings]

FIG. 1 is a front view of a saddle type deflection coil according to the present invention.

FIG. 2 is a rear view of the saddle type deflection coil.

FIG. 3 is a side view of the saddle type deflection coil.

FIG. 4 is a front view showing the positions of blocks and pins used when manufacturing the saddle-type deflection coil.

FIG. 5 is a back view showing the positions of pins used when manufacturing the saddle-type deflection coil.

FIG. 6 is a diagram illustrating an equivalent relationship between a saddle type deflection coil having first and second sub-coils and a saddle type deflection coil having a magnet.

FIG. 7 is a graph showing the relationship between the position of the magnet and the convergence and pincushion distortion in the saddle type deflection coil having the magnet.

FIG. 8 is a diagram showing left and right pincushion distortion measurement positions.

FIG. 9 is a perspective view of a conventional saddle-type deflection coil.

FIG. 10 is a diagram showing a pair of winding molds used for manufacturing a saddle type deflection coil.

FIG. 11 is a front view of a conventional saddle-type deflection coil.

FIG. 12 is a front view of another conventional saddle-type deflection coil.

13 (a) and 13 (b) are diagrams showing left and right pincushion distortion and side beam misconvergence.

[Explanation of symbols]

(1) Saddle type deflection coil (2) Cross section of electron gun (3) Screen side transition (4) Deflection field generator (5) First subcoil (6) Second subcoil. (51) Crossover (61) Crossover

Claims (4)

[Claims] 1. An electron gun side end and a screen side end of a pair of deflection magnetic field generators (4) (4) extending along the tube axis direction are respectively connected to an electron gun side crossover (2) and a screen. Side crossing part
In a saddle type deflection coil for a color picture tube connected to each other by (3), an opening (11) surrounded by a pair of deflection magnetic field generation sections (4) and (4) and both crossing sections (2) and (3) is formed. , A plurality of sub-coils formed by arranging a part of the conductor group forming the electron gun side crossing part (2) are arranged, and the crossing parts of each sub-coil are formed at positions displaced from each other in the tube axis direction. A saddle-type deflection coil for a color picture tube, which is characterized in that 2. A first sub-coil in the opening (11).
(5) and the second sub-coil (6) are arranged, the crossover (51) of the first sub-coil (5) on the electron gun side and the second sub-coil on the screen side.
The saddle-type deflection coil for a color picture tube according to claim 1, wherein the transitional portion (61) of the sub-coil (6) is arranged at a position where both pincushion distortion and misconvergence can be suppressed. 3. The bridging portion (51) of the first sub-coil (5) is about one third of the total length of the deflection magnetic field generating portion (4) along the tube axis direction.
It is arranged at a position separated from the electron gun side transition part (2) by a distance of about 1/2, and the transition part (61) of the second sub-coil (6) is about 1/2 to about 3 minutes of the total length. The saddle-type deflection coil for a color picture tube according to claim 2, wherein the saddle-type deflection coil is arranged at a position separated from the electron gun side crossing portion (2) by a distance of 2 above. 4. The both ends of the transitional portion (61) of the second sub-coil (6) and the outer edge of the deflection magnetic field generation unit (4) (4) extending in the pipe axial direction with respect to the pipe axis are 40 and. The saddle-type deflection coil for a color picture tube according to claim 2 or 3, wherein the saddle-type deflection coil is provided at a position that forms an angle of ° to 55 °.