JPH09265922A - Deflection yoke - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance a convergence characteristic by generating a pin magnetic field in the direction canceling a horizontal deflection magnetic field with an auxiliary coil arranged in an electron gun. SOLUTION: Auxiliary coils SH1-SH4 are stuck on an almost cylindrical wall surface extending than a coil bobbin of a horizontal coil, in the rear on the electron gun side of the horizontal coil along the wall surface of a cathode ray tube so as to correspond to the corner of a display screen. A pair of auxiliary coils SH1, SH2 arranged on the upper side of the auxiliary coils SH1-SH4 is connected in series to a horizontal coil H1 in the direction canceling the deflection magnetic field of the upper side horizontal coil H1, a pair of auxiliary coils SH3, SH4 arranged on the lower side is connected in series to a horizontal coil H2 in the direction canceling the deflection magnetic field of the lower side horizontal coil H2, and as shown in Φ SH, strong pin magnetic field is generated in the direction canceling the horizontal deflection magnetic field in the electron gun side of a deflection yoke 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke, in which an auxiliary coil is arranged on the electron gun side, and a pin magnetic field is generated by the auxiliary coil in a direction of canceling a horizontal deflection magnetic field to improve the convergence characteristic.

[0002]

2. Description of the Related Art Conventionally, in a deflection yoke, the convergence characteristic is adjusted by adjusting the winding distribution.
Misconvergence that cannot be completely corrected even by adjusting the winding distribution is corrected by an auxiliary device such as a coil.

That is, in this type of deflection yoke, for example, a pair of horizontal coils is formed by section winding using a coil bobbin, and a horizontal deflection magnetic field that vertically links the neck of the cathode ray tube is generated by the pair of horizontal coils. To do. A pair of similarly wound vertical coils is arranged outside the horizontal coil, and the vertical coils form a vertical deflection magnetic field that links the neck of the cathode ray tube to the left and right.

In this horizontal coil, the winding distributions are different on the funnel bend side (ie on the panel side of the cathode ray tube) and on the neck bend side (ie on the electron gun side of the cathode ray tube), As a result, a horizontal deflection magnetic field is generated by the pin magnetic field on the funnel bend side and the barrel magnetic field on the neck bend side.

That is, when the horizontal deflection magnetic field is a uniform magnetic field,
In the display screen of the cathode ray tube, as shown in FIG. 7, the misconvergence (hereinafter referred to as HAM) corresponding to the arrangement of the electron guns is displayed.
(P's misconvergence) occurs. FIG. 7
In, the red and blue vertical lines are indicated by the symbols R and B, respectively. On the other hand, when the horizontal deflection magnetic field is brought close to the pin magnetic field, the convergence changes in the direction of correcting the misconvergence due to the uniform magnetic field. Thus, the winding distribution is set so that the horizontal deflection magnetic field becomes a pin magnetic field as a whole.

However, if the horizontal deflection magnetic field is simply set to the pinned magnetic field, as shown in FIG.
The red and blue vertical lines RB are misconverged outside the display screen with respect to the green vertical line G (hereinafter referred to as HCR misconvergence). Thus, in the conventional deflection yoke, the winding distribution of the horizontal coil is set so that the funnel bend side and the neck bend side become the pin magnetic field and the barrel magnetic field, respectively, and the pin magnetic field as a whole. Misconvergence, which is difficult to correct due to the line distribution, has been corrected by attaching magnetic pieces such as permalloy.

[0007]

However, as described above, H
A winding distribution that satisfies both AMP and HCR misconvergence has a problem in that it is difficult to design in practice and it takes a lot of time to set the winding distribution. Especially in order to realize self-convergence in this type of deflection yoke,
After all, the horizontal deflection magnetic field must be set to a strong pinning magnetic field as a whole, and in this case, it is often difficult to completely correct the HCR misconvergence by the winding distribution.

Therefore, if the winding distribution that satisfies both HAMP and HCR misconvergence can be easily set, the design work can be made more efficient by that much, which is considered convenient.

The present invention has been made in consideration of the above points, and it is an object of the present invention to propose a deflection yoke which can improve the convergence characteristic more easily than ever before.

[0010]

In order to solve such a problem, in the present invention, a pin magnetic field is generated in a direction in which a horizontal deflection magnetic field is canceled by an auxiliary coil arranged on the electron gun side.

The pinning magnetic field in the direction of canceling the horizontal deflection magnetic field generated by the auxiliary coil arranged on the electron gun side acts so as to greatly reduce the deflection angle of the side beam as compared with the central electron beam. The convergence is corrected so that the red and blue electron beams scan the inside of the display screen. Therefore, the HCR misconvergence that remains when the horizontal deflection magnetic field is set to the pin magnetic field, that is, the red and blue vertical lines RB with respect to the green vertical line G on the left and right of the display screen, misconvergence outside the display screen is an auxiliary coil. Can be corrected by the magnetic field.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 2 is a side view showing the deflection yoke according to the embodiment of the present invention. This deflection yoke 1 has auxiliary coils SH1 to SH4 arranged on the neck bend side in addition to the structure of a general deflection yoke.
~ SH4 improves the convergence characteristics.

That is, in the deflection yoke 1, a magnet wire is wound around a substantially funnel-shaped coil bobbin, and a pair of horizontal coils is formed in a saddle shape by section winding. Further, the deflection yoke 1 is a vertical coil wound in the same manner.
After being arranged on the outer side of the pair of horizontal coils, the core 3 is further arranged on the outer side thereof, whereby the deflection yoke main body 4 by the horizontal coil, the vertical coil and the core is formed.

Further, in the deflection yoke 1, a front cover 5 and a back cover 6 are attached to the deflection yoke body 4. Here, the magnet 7 for adjusting the purity, the band 8 and the like are attached to the back cover 6 in advance.

On the other hand, the auxiliary coils SH1 to SH4
1, is formed in a substantially rectangular shape along the wall surface of the cathode ray tube corresponding to the corner of the display screen. The auxiliary coils SH1 to SH4 are attached to a substantially cylindrical wall surface extending from the coil bobbin of the horizontal coil, and are arranged behind the horizontal coil on the electron gun side.

Further, as shown in FIG. 3, these auxiliary coils SH1 to SH4 have a pair of auxiliary coils SH1 and SH2 arranged on the upper side in a direction in which the deflection magnetic field of the upper horizontal coil H1 is canceled out. And a pair of auxiliary coils SH3 and S connected in series with the lower coil.
H4 is connected in series with the horizontal coil H2 in the direction of canceling the deflection magnetic field of the lower horizontal coil H2, and these series circuits are connected in parallel.

As a result, the auxiliary coils SH1 to SH4 are
As indicated by the symbol ΦSH in FIG. 1, a strong pin-type magnetic field is generated on the electron gun side of the deflection yoke 1 in the direction of canceling the horizontal deflection magnetic field.

In the above structure, the electron beam emitted from the electron gun is deflected by the deflection magnetic field formed by the deflection yoke 1 to form a raster image. At this time, depending on the deflection magnetic field of the pin magnetic field formed by the horizontal coils H1 and H2, as shown in FIG. 4, the red and blue vertical lines RB are outward with respect to the green vertical line G on the left and right of the display screen. Negative misconvergence occurs in the HCR that is misaligned.

As shown in FIG. 5, this horizontal deflection magnetic field ΦH
On the other hand, in the auxiliary coils SH1 to SH4, the strong pin-shaped magnetic field ΦSH is generated in the direction of canceling the horizontal deflection magnetic field ΦH, so that the side beam is generated in the side beam as compared with the deflection angle of the centrally arranged green electron beam. The deflection angles of the red electron beam R and the blue electron beam B are reduced, and the image formed by these red and blue electron beams R and B is displaced and displayed inside the display screen. That is, FIG.
As shown in, the correction magnetic field SΦH is generated by the auxiliary coils SH1 to SH4 in the direction for correcting the negative misconvergence of the HCR, whereby the misconvergence of the HCR can be adjusted independently of the horizontal coils H1 and H2. .

According to the above structure, the four auxiliary coils SH1 to SH4 each having a substantially rectangular shape along the wall surface of the cathode ray tube are provided to the horizontal coils H1 and H2 in correspondence with the corners of the display screen.
These auxiliary coils SH1 to SH are arranged on the electron gun side of the
By generating a pinning magnetic field in a direction in which the horizontal deflection magnetic field is canceled by H.4, H independent of the horizontal coils H1 and H2 is generated.
CR misconvergence can be adjusted, and the convergence property can be improved accordingly. Therefore, the time required for designing the deflection yoke can be shortened accordingly.

In the above-described embodiment, the case where the four auxiliary coils SH1 to SH4 generate the pinned magnetic field in the direction of canceling the horizontal deflection magnetic field has been described, but the present invention is not limited to this, and the present invention is not limited thereto. The auxiliary coils of various numbers and shapes can be widely applied.

Further, in the above-mentioned embodiment, the case where the horizontal coil and the vertical coil are formed in the saddle type by the section winding is described, but the present invention is not limited to this, and in the case of making the saddle type by the die winding. Further, it can be widely applied to the case where the vertical coil is formed in a toroidal shape.

[0024]

As described above, according to the present invention, the auxiliary coil is disposed on the electron gun side, and the auxiliary coil generates a pin magnetic field in a direction to cancel the horizontal deflection magnetic field, thereby generating the auxiliary coil. It is possible to correct the misconvergence that remains by making the horizontal deflection magnetic field into a pin magnetic field by the applied magnetic field, thereby improving the convergence characteristic as compared with the conventional case.

[Brief description of drawings]

FIG. 1 is a perspective view showing an auxiliary coil of a deflection yoke according to an embodiment of the present invention.

FIG. 2 is a side view showing the overall configuration of the deflection yoke of FIG.

FIG. 3 is a connection diagram showing a connection of auxiliary coils of FIG.

FIG. 4 is a schematic diagram for explaining misconvergence that remains when a horizontal deflection magnetic field is changed to a pin magnetic field.

FIG. 5 is a schematic diagram for explaining the operation of the auxiliary coil.

FIG. 6 is a schematic diagram showing convergence correction by an auxiliary coil.

FIG. 7 is a schematic diagram showing misconvergence generated by a uniform magnetic field.

FIG. 8 is a schematic diagram showing misconvergence when the horizontal deflection magnetic field is a pinned magnetic field.

[Explanation of symbols]

1 ... Deflection yoke, 3 ... Core, 4 ... Deflection yoke body, 6 ... Back cover, H1, H2 ... Horizontal coil, SH
1-SH4 ... Auxiliary coil

Claims (2)

[Claims] 1. An auxiliary coil arranged on the electron gun side,
A deflection yoke, which generates a pin magnetic field in a direction of canceling a horizontal deflection magnetic field. 2. The auxiliary coil is arranged on the electron gun side so as to surround the cathode ray tube so as to correspond to a corner of the display screen, and is formed of four coils. Deflection yoke.