JPH08329860A - Deflection device for cathode-ray tube - Google Patents

Abstract

PURPOSE: To provide a deflecting device in which readjustment can be made easily even through the installing position relative to a cathode-ray tube varies. CONSTITUTION: A deflection device for cathode-ray tube has a horizontal and a vertical deflection coil 23H, 23V held on a mold 22 in the form of an almost hollow trapezoid and is secured to near the boundary of the large diametric portion of a funnel 2 to the neck part 5 by fastening a fixation part 21 provided at the tail by a fastening tool 31. A guide projection 25 is provided inside the large diameter portion of the mold, and there also is installed a rotation adjusting part 28 in the form of a hollow trapezoid furnished with a guide groove which is engaged by the guide projection rotatably.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube deflector mounted on a cathode ray tube such as a color picture tube.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 4, a color picture tube has an envelope composed of a panel 1 and a funnel-shaped funnel 2 joined to the panel 1, and an inner surface of the panel 1 has three colors. A phosphor screen 3 composed of a phosphor layer is provided, and a shadow mask 4 is arranged inside the phosphor screen 3 so as to face the phosphor screen 3. On the other hand, funnel 2
An electron gun 6 for emitting three electron beams is sealed in the neck 5 of the. And 3 emitted from this electron gun 6
The electron beam is deflected by the horizontal and vertical deflection magnetic fields generated by the deflection device 8 mounted on the outer side in the vicinity of the boundary between the large-diameter portion 7 of the funnel 2 and the neck 5, and the phosphor screen 3 is horizontally and vertically deflected. It is formed so as to display a color image by scanning.

In such a color picture tube, in particular, the electron gun 6 is an in-line type electron gun which emits three electron beams arranged in a row passing through the same horizontal plane, and as shown in FIG.
The horizontal deflection magnetic field 10H and the vertical deflection magnetic field 10V of the deflecting device for deflecting the three-electron beams arranged in a row emitted from this electron gun are pincushion type and the vertical deflection magnetic field 10V are barrel type. A self-convergence in-line type color picture tube that is focused on a phosphor screen has been widely put into practical use.

FIG. 6 shows an example of such a color picture tube deflecting device. The deflecting device 8 has a large diameter portion on the front end side and a small diameter portion on the rear end side corresponding to the outer shape in the vicinity of the boundary portion between the large diameter portion of the funnel and the neck, and the neck portion on the rear end side. A substantially hollow trapezoidal mold 13 made of synthetic resin provided with a fixing portion 12 formed of a plurality of tongues surrounding the outer surface.
And a pair of upper and lower saddle type horizontal deflection coils 14H held inside the mold 13, and a pair of left and right saddle type vertical deflection coils 14 held outside the mold 13.
V and a hollow trapezoidal core 15 surrounding the outside of the vertical deflection coil 14V.

As shown in FIG. 4, the deflection device 8 is attached near the boundary between the large-diameter portion 7 of the funnel 2 of the color picture tube and the neck 5, and further the purity convergence of the neck 5 is carried out. A magnet 17 (PCM) is attached, and together with the PCM, the position of the deflecting device 8 in the tube axis direction, the rotation around the tube axis, the inclination with respect to the tube axis, etc. are adjusted, and the landing (purity) of the electron beam on the three-color phosphor layer is performed. , Convergence), screen tilt, etc. to adjust appropriately. After that, the fixing portion 12 on the rear end side of the deflecting device 8 is tightened with a band 18, and a wedge 19 coated with silicon resin is inserted into a gap between the front end portion of the deflecting device 8 and the large diameter portion 7 of the funnel 2. This is done by fixing the deflecting device 8 in place.

However, if the deflecting device 8 is adjusted and attached as described above, even if the screen does not tilt immediately after the adjustment,
Unnecessary force is applied to the deflecting device 8 due to the insertion of the wedge 17 or the like, so that the deflecting device 8 may change over time and the screen may tilt. In particular, regarding the display tube, the display monitor device is made compact and is affected by the flyback linearity coil, which tends to cause screen tilt.

The change with time and the inclination of the screen of the display tube after such adjustment cannot be easily readjusted because the wedge 17 inserted in the front end portion of the deflecting device 8 has already hardened. That is, even if the band 18 fastening the fixing portion 12 on the rear end side of the deflecting device 8 is loosened and the deflecting device 8 is rotated, the front end portion of the deflecting device 8 is fixed by the wedge 19, so that the original Will return to the state. Band 1 again
By loosening 7, the mounting state of the deflecting device 8 changes. Therefore, conventionally, when a change with time occurs, the landing of the electron beam on the three-color phosphor layer is reconfirmed, and then the fixed wedge 17 is removed and a new wedge is inserted and fixed again. I am adjusting.

[0008]

As described above, the deflection device of the color picture tube is mounted by mounting the deflection device near the boundary between the large-diameter portion of the funnel and the neck, and further by mounting the PCM on the neck. , Together with this PCM, the position of the deflection device in the tube axis direction, the rotation around the tube axis, the tilt with respect to the tube axis, etc. are adjusted to appropriately adjust the landing of the electron beam with respect to the three-color phosphor layer, the tilt of the screen, etc. After that, the fixing part on the rear end side of the deflecting device is tightened with a band, and a wedge coated with silicone resin is inserted and fixed in the gap between the front end part of the deflecting device and the large diameter part of the funnel. There is.

However, when the deflecting device is adjusted and fixed as described above, an unreasonable force is applied to the deflecting device by inserting a wedge or the like, so that it may change over time and the screen may tilt. Also, especially for the display tube, the display monitor device has become more compact,
The tilt of the screen easily occurs due to the influence of the linearity coil.

With respect to the change with time and the inclination of the screen of the display tube after such adjustment, since the wedge inserted in the front end portion of the deflecting device has already hardened, the fixing portion on the rear end side of the deflecting device is tightened. Even if the band is loosened and the deflecting device is rotated, the front end portion of the deflecting device returns to its original state because it is fixed by the wedge fixed by the cured silicone resin. Also, loosening the band changes the mounting state of the deflecting device, and cannot be easily readjusted. Therefore, conventionally, the fixed wedge is removed and
After reconfirming the landing of the electron beam on the color phosphor layer, a new wedge is inserted and fixed, whereby the adjustment is performed again. Therefore, the installation of the conventional deflection device,
It is not preferable in production and causes a cost increase.

The present invention has been made in view of the above problems, and an object thereof is to construct a deflecting device that can be easily readjusted even if the mounting position of the deflecting device with respect to the cathode ray tube changes. To do.

[0012]

[Means for Solving the Problems] The front end side is a large diameter portion and the rear end side is a small diameter portion corresponding to the outer shape in the vicinity of the boundary portion between the large diameter portion and the neck of the funnel funnel of the cathode ray tube. The horizontal and vertical deflection coils are held in a hollow trapezoidal mold having a fixed part fixed to the neck on the end side, and the large part of the funnel and the neck are fixed by tightening the fixed part with a fastener. In the deflection device for a cathode-ray tube fixed near the boundary part of the mold, a guide protrusion is provided inside the large diameter portion of the mold, and a guide groove that rotatably engages with the guide protrusion is provided inside the large diameter portion of the mold. The formed hollow trapezoidal rotation adjusting portion was arranged.

Guide protrusions are provided inside the large diameter portion and the fixed portion of the mold, respectively, and guide grooves inside the large diameter portion of the mold are rotatably engaged with the guide protrusions inside the large diameter portion. A hollow trapezoidal rotation adjusting part with a guide groove formed inside the fixing part of the mold is rotatably engaged with the guide protrusion inside the fixing part. I placed it.

[0014]

As described above, the hollow trapezoidal shape is provided with the guide protrusion on the inside of the large diameter portion of the mold and the guide groove formed on the inside of the large diameter portion of the mold so as to rotatably engage with the guide protrusion. In the case of a color picture tube, for example, in the case of a color picture tube, after adjusting the landing of the electron beam with respect to the three-color phosphor layer and the tilt of the screen, the rotation adjustment section is inserted into the gap between the large diameter part of the funnel and the front end part of the deflecting device. Even if the wedge is fixed by hardened silicone resin, it can be rotated freely without removing the wedge by loosening the band that fastens the fixed part at the rear end of the deflecting device. Therefore, the tilt of the screen can be easily readjusted.

Further, guide protrusions are provided inside the large-diameter portion and the fixed portion of the mold, respectively, and guide grooves inside the large-diameter portion of the mold are rotatably engaged with the guide protrusions inside the large-diameter portion. The formed hollow trapezoidal rotation adjustment part is arranged, and the hollow cylindrical rotation adjustment part is formed inside the fixed part of the mold with the guide groove that rotatably engages with the guide protrusion inside the fixed part. Then, the rear end of the deflecting device can also rotate extremely smoothly, and the tilt of the screen can be readjusted more easily.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described based on embodiments with reference to the drawings.

FIG. 1 shows a deflecting device for a color picture tube, which is one embodiment thereof. This deflection device is a funnel-shaped funnel 2
Corresponding to the outer shape in the vicinity of the boundary between the large-diameter portion 7 and the neck 5, the front end side is the large-diameter portion, the rear end side is the small-diameter portion, and the rear end portion surrounds the outer surface of the neck 5. Mold 22 having a substantially hollow trapezoidal shape provided with a fixing portion 21 composed of a tongue piece 20
And a pair of upper and lower saddle type horizontal deflection coils 23H held inside the mold 22, and a pair of left and right saddle type vertical deflection coils 23 held outside the mold 22.
V and a hollow trapezoidal core 24 surrounding the outside of the vertical deflection coil 23V.

Further, in this deflecting device, the fixed portion 2 on the inside of the large-diameter portion on the front end side of the mold 22 and on the rear end side thereof.
1, guide projections 25 and 26 are provided inside, respectively, and inside the large-diameter portion on the front end side of the mold 22, as shown in FIG. 2, the guide projections inside the large-diameter portion are rotatable. A hollow trapezoidal rotation adjusting portion 28 in which an engaging guide groove 27 is formed is arranged. Further, inside the fixed portion 21 on the rear end side of the mold 22, there is arranged a hollow cylindrical rotation adjusting portion 30 in which a guide groove 29 is formed that rotatably engages with a guide projection portion inside the fixed portion 21. ing.
Further, on the inner surface of the band mounting portion of the fixed portion 21, the band 3
There is provided a protrusion 32 that strongly presses the rotation adjusting portion 30 to firmly fix it to the neck 5 when tightened with 1 (fastener).

Specifically, the hollow trapezoidal rotation adjusting portion 28 has a thickness of 3.0 mm and an opening diameter A on the front end side of 50 to 50 mm.
100 mm, length B is 30-50 mm, opening diameter C on the front end side
Is formed to 30 to 50 mm. In addition, the hollow cylindrical rotation adjusting unit 30 has the same thickness of 3.0 mm and the opening diameter D of 30 mm.
Hereinafter, the length E is formed to be 10 to 30 mm.

In such a deflecting device, the funnel-shaped funnel 2 of the color picture tube is provided via the rotation adjusting portions 28 and 30 rotatably provided on the fixed portions 21 on the front end side and the rear end side, respectively. It is mounted in the vicinity of the boundary between the large diameter portion 7 and the neck 5, and the fixing portion 21 is tightened with the band 31. Further, it is fixed by inserting a wedge 34 coated with silicon resin or the like into a gap between the rotation adjusting portion 28 on the front end side and the large diameter portion 7 of the funnel 2.

By the way, when the deflecting device is constructed as described above, the following effects can be obtained.

That is, generally, when the deflecting device is attached to the color picture tube, the deflecting device is mounted near the boundary between the large-diameter portion 7 of the funnel funnel 2 and the neck 5, and the PCM is mounted on the neck 5. With this PCM, the position of the deflection device in the tube axis direction, the rotation around the tube axis, the inclination with respect to the tube axis, etc. are adjusted to control the landing of the electron beam on the three-color phosphor layer forming the phosphor screen, the tilt of the screen, and the like. After the adjustment, the fixing portion 21 on the rear end side of the deflecting device is tightened with the band 31, and silicon resin or the like is applied to the gap between the rotation adjusting portion 28 at the front end portion of the deflecting device and the large diameter portion 7 of the funnel 2. This is done by inserting and fixing the wedge 34.

However, when the deflection device attached in this way tilts the screen due to a change with time or the like and is readjusted,
In the deflecting device of this example, the rotation adjusting part 2 which is rotatable on the fixed part 21 on the front end side and the rear end part side of the deflecting device, respectively.
Since 8 and 30 are provided, if the band 31 that fastens the fixed portion 21 on the rear end side is loosened,
It can be easily rotated and the tilt of the screen can be readjusted.

That is, in the case of re-adjusting the mounting position of the deflecting device, conventionally, it is necessary to remove the fixed wedge once, and after the readjustment, insert the new wedge and fix it, which is not preferable in production, and Although this has caused an increase in cost, in the deflecting device of this example, it is not necessary to remove the fixed wedge 35, and the tilt of the screen can be readjusted very easily, and the conventional problems can be solved. You can

Further, in the deflecting device of this example, when the fixing portion 21 is tightened by the band 31, the band mounting portion is provided with the protrusion 32 that firmly fixes the rotation adjusting portion 30, so that the band 31 is not tightened. It is possible to prevent the displacement of the deflecting device which is caused due to the sufficientness.

In the above embodiment, the rotation adjusting portions are provided on both the front end side and the rear end side of the deflecting device. However, on the rear end side of the deflecting device, the band fastening the fixing portion is loosened. Then, since it becomes rotatable, the rotation adjusting portion inside the fixed portion on the rear end side can be a deflecting device having the same effect even if omitted.

In the above embodiment, the deflection device for the color picture tube has been described, but the present invention can be applied to the deflection device for the cathode ray tube other than the color picture tube.

[0028]

EFFECTS OF THE INVENTION Corresponding to the outer shape in the vicinity of the boundary between the large-diameter portion of the funnel-shaped funnel of the cathode ray tube and the neck, the front-end side is the large-diameter portion, the rear-end side is the small-diameter portion, and the rear-end side is The horizontal and vertical deflection coils are held in a substantially hollow trapezoidal mold with a fixed part that is fixed to the outer surface of the neck, and the fixed part is tightened with a tightening tool so that the boundary between the large-diameter part of the funnel and the neck is fixed. In a cathode-ray tube deflection device fixed near the portion, a guide protrusion is provided inside the large diameter portion of the mold, and a guide groove that is rotatably engaged with the guide protrusion is formed inside the large diameter portion of the mold. When a hollow trapezoidal rotation adjustment unit is installed, its mounting position is adjusted with respect to the cathode ray tube, and then the wedge resin inserted in the gap between the large-diameter part of the funnel and the front end of the deflector is hardened by silicone resin, etc. Fixation Also, without having to remove the wedge,
If the band that fastens the fixed portion at the rear end of the deflecting device is loosened, the band can be freely rotated and the tilt of the screen can be easily readjusted.

Guide protrusions are provided inside the large diameter portion and the fixed portion of the mold, respectively, and guide grooves are rotatably engaged with the guide protrusions inside the large diameter portion of the mold. A hollow trapezoidal rotation adjusting portion having a guide groove formed inside the fixing portion of the mold is rotatably engaged with the guide protrusion inside the fixing portion. When arranged, the rear end of the deflecting device can also rotate very smoothly, and the tilt of the screen can be readjusted more easily.

[Brief description of drawings]

FIG. 1 (a) is a perspective view showing the structure of a color picture tube deflecting device according to an embodiment of the present invention, and FIG. 1 (b) is a plan view showing a part thereof in section.

FIG. 2 is a perspective view showing a rotation adjusting unit arranged on the front end side of the deflecting device.

FIG. 3 is a perspective view showing a rotation adjusting unit arranged on the rear end side of the deflecting device.

FIG. 4 is a diagram showing a configuration of a color picture tube in which a deflecting device is mounted.

FIG. 5 is a diagram showing horizontal and vertical deflection magnetic fields of a self-convergence in-line type color picture tube.

FIG. 6 is a diagram showing a configuration of a conventional deflection device for a self-convergence in-line type color picture tube.

[Explanation of symbols]

 2 ... Funnel 5 ... Neck 7 ... Large diameter part 21 ... Fixed part 22 ... Mold 23H ... Horizontal deflection coil 23V ... Vertical deflection coil 24 ... Core 25 ... Projection part 26 ... Projection part 27 ... Guide groove 28 ... Rotation adjustment part 29 ... Guide groove 30 ... Rotation adjusting part 31 ... Band 32 ... Projection part 34 ... Wedge

Claims (2)

[Claims] 1. A front end side has a large diameter portion and a rear end side has a small diameter portion, and a rear end portion side thereof, corresponding to the outer shape of the funnel-shaped funnel of the cathode ray tube in the vicinity of the boundary portion between the large diameter portion and the neck. Horizontal and vertical deflection coils are held in a hollow trapezoidal mold provided with a fixing portion fixed to the outer surface of the neck, and by fastening the fixing portion with a fastener, a large-diameter portion of the funnel and the neck In the cathode ray tube deflection device fixed near the boundary, a guide protrusion is provided inside the large diameter portion of the mold,
In addition, a hollow trapezoidal rotation adjusting portion in which a guide groove that rotatably engages with the guide protrusion is formed is disposed inside the large-diameter portion of the mold, and the deflection device for a cathode ray tube is characterized. 2. The front end side has a large diameter portion and the rear end side has a small diameter portion, and the rear end portion side corresponds to the outer shape of the funnel-shaped funnel of the cathode ray tube near the boundary portion between the large diameter portion and the neck. Horizontal and vertical deflection coils are held in a hollow trapezoidal mold provided with a fixing portion fixed to the outer surface of the neck, and by fastening the fixing portion with a fastener, a large-diameter portion of the funnel and the neck In the cathode ray tube deflection device fixed near the boundary, guide protrusions are provided inside the large diameter portion and the fixed portion of the mold, and inside the large diameter portion of the mold, guide protrusions inside the large diameter portion are provided. A hollow trapezoidal rotation adjusting part having a guide groove for rotatably engaging with the mold is arranged, and a guide groove for rotatably engaging with a guide protrusion inside the fixed part is provided inside the fixed part of the mold. Been formed Cathode-ray tube deflection apparatus characterized by rotational adjustment of the empty tubular is located.