JPH0455403Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a deflection yoke, and in particular to a case thereof.

Conventional Technology Conventionally, in an electromagnetic deflection type cathode ray tube, a deflection yoke is attached to the outside near the joint between the funnel and the net, and the electron beam reaching the phosphor screen is swung vertically and horizontally. This deflection yoke has a core combined with a horizontal deflection coil and a vertical deflection coil, and there are various structures depending on the purpose of use. For example, it is well known that a deflection yoke for a cathode ray tube built into an electronic viewfinder installed in a video camera uses a saddle-shaped coil for the horizontal deflection coil and a toroidal coil for the vertical deflection coil. However, this is not necessarily satisfactory in terms of power saving and weight reduction of the deflection coil.
In order to improve these problems, a system has been proposed in which both deflection coils are incorporated into a cylindrical ferrite core (chrysanthemum-shaped core) in which a hollow portion into which a cathode ray tube neck or the like is inserted is formed into a chrysanthemum-shape. In a deflection yoke using such a chrysanthemum-shaped core, a flexible printed circuit board is attached to the outer periphery of the core, terminals of each lead wire of the deflection coil are soldered to predetermined locations, and hot-melt resin made of butyral or other resin is attached. It is further covered with. This hot melt not only insulates and mechanically protects the deflection coil, but is also used to integrate the core incorporating the deflection coil with the magnet mounting tube in which the electron beam adjustment magnet is mounted.

Problems to be Solved by the Invention However, such hot-melt coatings have drawbacks in insulation, protection, bonding strength, etc. of the deflection coil, and require a lot of assembly man-hours. Incidentally, a graphite conductive film is coated on the outside of the funnel of the cathode ray tube, and the conductive film is grounded. For this reason, the deflection yoke that is attached to the outside near the joint between the funnel and the neck of the cathode ray tube is made of electrical wire with thick insulation to withstand its own applied voltage and prevent short circuits with the ground. Use a coil. Therefore, usually 1
Uses enamel insulated wires of type 0, type 0, etc.
However, coils using thickly insulated wires have problems in reducing the size and cost of the deflection yoke.

The present invention was developed in view of these conventional problems, and aims to provide a deflection yoke that can improve electrical and mechanical reliability, and achieve miniaturization and cost reduction. .

Means for Solving the Problems Means for achieving the above object will be described below with reference to FIG. 1, which corresponds to an embodiment.

This deflection yoke includes a case 10 consisting of a holder 12, a holder cap 14, and a coil insulating sheet 16. The holder 12 has a deflection coil 2 having a cathode ray tube neck insertion hole 18.
A main body cylindrical part 26 that partially covers the periphery of the core 20 in which the electron beams 2 and 24 are combined, and a magnet mounting cylindrical part 28 to which the electron beam adjustment magnets 36 and 38 are attached.
It is molded into one piece. The holder cap 14 partially covers the rest of the periphery of the core 20, etc., and is locked to the main body cylindrical part 26, and is provided with a central hole 46 into which the part near the joint between the funnel and the neck of the cathode ray tube is inserted. There is. The coil insulating sheet 16 is interposed between the inside of the holder cap 14 and the deflection coils 22, 24, and has a plurality of slits at positions corresponding to the central hole 46.

Effect The above means works as follows.

When the deflection yoke is housed in the case 10 consisting of the holder 12, holder cap 14, and coil insulating sheet 16 having such a configuration, the insulation properties of the deflection coils 22 and 24 are improved by using an insulating material for them. Can be enhanced and protected against external forces. Incidentally, since the holder 12 is integrally molded, the bonding strength between the core 20 in which the deflection coils 22 and 24 are combined and the magnet mounting cylindrical portion 28 is naturally increased. When attaching the deflection yoke to a cathode ray tube, a neck is inserted into the central hole 46 of the holder cap 14 from the end, and the coil insulating sheet 16 is bent at the slit and pushed into the neck insertion hole 18. Therefore, the inside of the net insertion hole 18 of the core 20 in which the deflection coils 22 and 24 are combined is also covered with the tongue piece of the insulating sheet 16, thereby increasing the insulation properties of the deflection coils 22 and 24 with respect to the funnel of the cathode ray tube. It should be noted that if the coil insulating sheet 16 is made elastic, the deflection yoke will be better held against the cathode ray tube. As a result, the insulation coating of the electric wires used for the deflection coils 22 and 24 can be made thinner.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings.

FIG. 1 is a sectional view showing a deflection yoke according to an embodiment of the present invention (only the case is shaded). In the figure, 10 is a case of a deflection yoke consisting of a holder 12, a holder cap 14, and a coil insulating sheet 16. Inside the case 10, a chrysanthemum-shaped core 20 having a hole 18 for inserting a cathode ray tube, for example, and two horizontal deflection coils 22 and two vertical deflection coils 24 installed at predetermined locations is housed. The holder 12 has a cylindrical structure shown in FIG. 2 (front view), FIG. 3 (right side view), and FIG. 4 (cross-sectional view taken along line A-A in FIG. 3),
A main body cylindrical part 26 that partially covers the periphery of a core 20 which is a combination of deflection coils 22 and 24 having a cathode ray tube neck insertion hole 18, and an elongated magnet mounting cylindrical part to which an integrally molded electron beam adjusting magnet is attached. It consists of a section 28. This main body cylindrical portion 26 has substantially symmetrical covering portions 30, 30a, 30 projecting in the axial direction of the holder 12.
b, and protrusions 32, 32a, and 32b, which engage with the holder cap 14, are provided near each tip. However, while the left covering part 30a has one locking protrusion 32a, the right covering part 3
There are two locking protrusions 32b in 0b. Further, the magnet mounting cylindrical part 28 has a notch 34 that divides the cylindrical part 28 into approximately four parts from the middle part toward the tip along the axial direction of the holder 12. From the side to the tip, two centering magnets 36, two focus magnets 38, a round nut 40, and a tightening ring 42.
etc. are respectively attached to predetermined positions.

The holder cap 14 has a cap-like structure shown in FIG. 5 (front view), FIG. 6 (right side view), and FIG. 7 (partial sectional view of FIG. 6), and has a core 20 exposed from the holder 12. It partially covers the remaining peripheral parts of the deflection coils 22, 24, etc., and is locked to the main body cylindrical part 26, and the vicinity of the joint between the funnel and the neck of the cathode ray tube is inserted into the center of the front wall 44. A central hole 46 with a large diameter is drilled. Further, the side wall 48 also has holes 50, 50a, 50 into which the locking protrusions 32 of the holder 12 fit, respectively.
b are opened at corresponding positions. Note that the front wall 44 has a plurality of other holes with small diameters.

The coil insulating sheet 16 has a disk-like structure shown in FIG. center hole 46
A plurality of slits 52 are provided at positions corresponding to . If these slits 52 are cut at intervals of 45°, for example, so that they coincide at the center of the disk,
Deflection coil 2 for the funnel of the cathode ray tube
It is suitable for insulating and holding 2 and 24. The above-mentioned holder 12, holder cap 14, coil insulating sheet 16, etc. are all made of plastic as an insulating material. For example, holder 12,
The holder cap 14 is made of polyphenylene oxide (PPO), ABS resin, etc., and the coil insulation sheet 16 is made of polyester resin.

These holders 12, holder caps 1
4. A deflection coil 2 having a neck insertion hole 18 inside a case 10 made of a coil insulating sheet 16.
9 (front view),
The result will be as shown in Fig. 10 (right side view). In the figure, 54
are four lead wires, 56 is a flexible printed circuit board, and 58 is a resistor. Two of these lead wires 54 are connected via a circuit board 56,
It is connected to both ends of the horizontal deflection coil 22 connected in parallel, and the other two are connected to both ends of the vertical deflection coil 24 connected in series, respectively, via a circuit board 56. A resistor 58 is also connected to both ends of one vertical deflection coil 24. In addition,
Solder the connecting points. In this way, if the core 20 in which the deflection coils 22 and 24 are combined is housed inside the insulating case 10, which has high mechanical strength, the insulation properties of the deflection coils 22 and 24 will be increased and they will be resistant to external forces. can be protected. Note that since the holder 12 is integrally molded, the core 20 combining the deflection coils 22 and 24
Naturally, the bonding strength between the magnet and the magnet mounting cylindrical portion 28 is increased. In addition, when attaching the deflection yoke to a cathode ray tube (not shown), insert a neck into the center hole 46 of the holder cap 14 from the end, and insert the neck into the neck insertion hole 18 lined up on the axis and into the inside of the magnet mounting cylindrical part 28. The coil insulation sheet 16 is then bent at the slit 52 and inserted into the neck insertion hole 1.
8 is pushed inside. Therefore, the inside of the neck insertion hole 18 of the core 20 in which the deflection coils 22 and 24 are combined is also uniformly covered with the tongue piece of the coil insulation sheet 16, and the insulation of the deflection coils 22 and 24 with respect to the funnel of the cathode ray tube is reduced. To increase. It should be noted that if the coil insulating sheet 16 has elasticity, the deflection yoke will be better held against the cathode ray tube. As a result, the deflection coil 22,
It becomes possible to make the insulation coating of the electric wire used in 24 thinner (as long as it can withstand the voltage applied to the coil), and two types of enamel insulated electric wire can be used. Furthermore, although the number of parts increases, costs can be reduced by reducing assembly man-hours. Therefore,
The deflection yoke can be made smaller and the cost can be reduced.

Effects of the invention According to the invention described above, electrical and mechanical reliability can be improved, and miniaturization and cost reduction can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a deflection yoke according to an embodiment of the present invention. Figure 2 is a front view showing the holder adopted in the same example, Figure 3 is its right side view,
FIG. 4 is a sectional view thereof. FIG. 5 is a front view showing the holder cap adopted in the same embodiment, FIG. 6 is a right side view thereof, and FIG. 7 is a partial sectional view thereof. FIG. 8 is a front view showing the coil insulating sheet employed in the same embodiment. FIG. 9 is a front view showing the external appearance of the deflection yoke according to the same embodiment, and FIG. 10 is a right side view thereof. 10... Case, 12... Holder, 14...
Holder cap, 16...Coil insulation sheet,
18...Net insertion hole, 20...Core, 22...
Horizontal deflection coil, 24... Vertical deflection coil, 26
. . . Main body cylindrical portion, 28 . . . Magnet attachment cylindrical portion, 32 .

Claims (1)

[Scope of utility model registration request] A holder that is integrally formed with a main body cylindrical part that partially covers the periphery of a core combined with a deflection coil having a cathode ray tube neck insertion hole, and a magnet mounting cylindrical part to which an electron beam adjustment magnet is mounted;
A central hole is provided near the joint between the funnel and the neck of the cathode ray tube, and a holder cap that partially covers the rest of the periphery of the core and is latched to the holder is inserted between the inside of the holder cap and the deflection coil. A deflection yoke characterized by comprising a case comprising a coil insulating sheet with a plurality of slits provided at positions corresponding to the central hole.