JP3064719U - Flyback transformer - Google Patents

Abstract

(57) [PROBLEMS] To prevent an anode cap at the tip of a high-voltage cable of a flyback transformer (FBT) from hitting another component on a wiring board and damaging that component. This prevents the anode grip at the tip of the high-voltage cable from hitting the electronic component and electrostatically destroying the electronic component. A high-voltage cable (3) is provided in a housing (21) of an FBT (2).
Cable holding means capable of attaching and detaching the vicinity 31 of the front end of the cable. The cable holding means is formed by a recessed bracket 26 provided on a bracket 23 reinforcing the mounting boss 22.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a flyback transformer.

[0002]

[Prior art]

 The flyback transformer (hereinafter referred to as “FBT”) is mounted on a wiring board equipped with a control circuit of a cathode ray tube (CRT), and a high-voltage cable (anode cable) is led out of its housing. An anode cap and an anode grip are attached to the tip. Then, the anode grip is connected to the anode button of the CRT, and the anode cap is provided so as to cover the periphery of the connection portion.

In an assembly line of a wiring board on which an FBT is mounted, a high-voltage cable of the FBT mounted on the wiring board hangs down due to the weight of the anode cap, and other electric wires mounted on the wiring board during the handling thereof. The components and electronic components could be hit or damaged by the anode cap.

[0004] Furthermore, since an electrical inspection is performed on the FBT before it is carried into the completion process, the FBT may be charged with static electricity after the inspection, and depending on the packing method, the anode grip may be an IC. When hitting such electronic components, the electronic components may be electrostatically damaged.

On the other hand, Japanese Utility Model Laid-Open No. 3-51811 discloses that an anode lead holder is provided with a holding portion for an anode lead and a holding portion for a resistor electrically connected to the anode lead. . Further, Japanese Utility Model Laid-Open No. 5-73975 describes a technique in which an anode cap is adsorbed and temporarily fixed to an adsorbing portion continuously connected to a wiring board on which an FBT is mounted via a breaking line. .

However, the technique described in Japanese Utility Model Laid-Open Publication No. 3-51811 cannot eliminate the above-mentioned fear because the high-voltage cable of the FBT hangs down due to the weight of the anode cap.

On the other hand, in the technique described in Japanese Utility Model Laid-Open Publication No. 5-73975, the anode cap is temporarily fixed to the suction portion continuously provided on the wiring board via a break line, so that the above is described above. Such a fear is eliminated. However, since an extra suction portion must be provided on the wiring board, the cost of the wiring board increases accordingly, and a new problem arises in that the wiring board becomes large.

[0008]

[Problems to be solved by the invention]

 The present invention has been made under the above circumstances. By providing a means for holding an anode lead (anode cable) so as not to hang down in the FBT itself, it is possible to use an anode cable without using a wiring board. It is possible to prevent drooping, so that the anode cap does not strike or damage electronic components or electronic components, and also prevent electrostatic breakdown of electronic components. It aims to provide an FBT.

[0009]

[Means for Solving the Problems]

 In the FBT according to the present invention, a cable holding means for detachably attaching a portion near the tip of the high-voltage cable is provided in a housing from which a high-voltage cable having an anode cap at the tip is led out. The high-voltage cable corresponds to the anode cable described in Japanese Utility Model Laid-Open No. 3-51811. According to this invention, by attaching a portion near the tip of the high-voltage cable to which the anode cap is attached to the cable holding means provided in the FBT housing, the high-voltage cable is weighed by the weight of the anode cap. Sagging is prevented. Therefore, there is no possibility that the anode cap hits an electric component or an electronic component to cause the electronic component to fall down or be damaged, and there is no possibility that the anode grip hits the electronic component and the electronic component is electrostatically damaged. In particular, since the cable holding means is provided in the housing of the FBT, a suction portion described in Japanese Utility Model Application Laid-Open No. 5-73975 is continuously provided on the wiring board side on which the FBT is mounted. There is no need to take extra measures.

[0010] The cable holding means can be formed by a concave portion having a holding portion capable of holding a portion near the tip of the high-voltage cable and an entrance through which the high-voltage cable enters and exits. It is desirable that the entrance is narrower than the holding portion. In this case, the high-voltage cable is held on the FBT housing side so that the high-voltage cable does not hang down only by pinching the high-voltage cable near the tip (with the anode cap attached) into the recess through the entrance. It is also possible to route the high-voltage cable into a predetermined shape simply by pulling it out of the entrance.

In particular, in the case where the housing is provided with a boss into which the mounting screw is screwed and a plate-like bracket for reinforcing the boss, the bracket is provided with the cable holding means. It is desirable. Here, since the bracket is a member that is desired to be provided to reinforce the boss, it is necessary to provide a special member to the housing to form the cable holding means. Disappears.

The FBT according to the present invention is configured such that the high-voltage cable is inserted into a housing from which a high-voltage cable having an anode cap at an end thereof is led out so as to be able to be pushed and pulled out, and a portion near the tip of the pushed-in high-voltage cable. Cable holding means for holding the cable may be provided. In the present invention, the cable holding means is preferably a hole provided in the housing and through which a high-voltage cable is inserted.

[0013] According to this, the high-voltage cable inserted into the cable holding means formed by the hole is pushed in, so that the high-voltage cable is held on the housing side of the FBT so as not to hang down. By pulling out the high-pressure cable, the high-pressure cable can be drawn into a predetermined shape.

[0014] The hole may be formed by a portal member integrally formed with the housing. In this case, since the portal member is formed integrally when the housing is formed, there is no need to perform an extra step for forming the hole.

Preferably, the portal member is provided on a top of the housing. According to this configuration, the vicinity of the tip of the high-voltage cable can be held at the top of the housing, so that the situation where the anode cap or the anode grip hits another electric component or electronic component is reliably prevented.

The FBT according to the present invention is mounted on, for example, a wiring board provided with a control circuit for a CRT.

[0017]

[Embodiment of the invention]

 FIG. 1 is a schematic perspective view of a main part of an embodiment of the FBT 2 according to the present invention, FIG. 2 is a schematic perspective view of a main part showing a state where the high-voltage cable 3 is held by the FBT 2 itself in FIG. 1, and FIG. FIG. 4 is a schematic perspective view of a main part of another embodiment of the FBT 2 according to the present invention, and FIG. 5 is a plan view schematically showing the wiring board 1 on which the FBT 2 and other components 6 are mounted. FIG.

In FIG. 5, reference numeral 1 denotes a wiring board provided with a control circuit for a CRT, 2 denotes an FBT mounted on the wiring board 1, and a high-voltage cable 3 is led out of the FBT 2; An anode grip (not shown) is electrically connected to the tip of the high-voltage cable 3, and the anode grip is surrounded by an anode cap 5 attached to the tip of the high-voltage cable 3. In addition, many necessary components (such as electric / electronic components) 6 such as ICs are mounted on the substrate body 1.

In the FBT of the embodiment shown in FIG. 1 and FIG. 2, a horizontal boss 22 is provided on a casing 21 from which the high-voltage cable 3 is led out, and a boss 22 for reinforcing a root portion of the boss 22 is provided. A plate-like bracket 23 is provided at a portion surrounded by the root of the boss 22, the side surface of the housing 21, and the stepped surface 24 formed on the housing 21. The boss 22 has a screw hole 25 for a mounting screw (not shown). The mounting screw is screwed into the screw hole 25 when the boss 22 is set on a television receiver, for example.

A cable holding means for detachably attaching a portion near the tip of the high-voltage cable 3 is provided on the bracket 23. That is, the concave portion 26 is formed at an appropriate position in the height direction of the bracket 23, and the concave portion 26 forms a cable holding means. As shown in detail in FIG. 3, the recess 26 includes a circular holding portion 27 capable of holding a portion 31 near the tip of the high-voltage cable 3 and an entrance 28 through which the high-voltage cable 3 is inserted and removed. 28 is narrower than the holding portion 27.

In the above-described FBT, a portion 31 near the distal end where the anode cap 5 of the high-voltage cable 3 is attached is inserted into the holding portion 27 through the entrance 28 of the recess 26 as shown by an arrow a in FIG. When sandwiched between the holding portions 27, the high-voltage cable 3 is prevented from hanging down due to the weight of the anode cap 5 shown in FIGS. Further, the high-voltage cable 3 can be routed in a predetermined shape simply by pulling out the portion 31 near the distal end of the high-voltage cable 3 from the entrance 28 as shown by the arrow b in FIG.

In FIGS. 1 to 3, the recessed portion 26 is provided by utilizing the bracket 23 that reinforces the boss 22, but this point can be achieved even if the recessed portion is provided in a portion other than the bracket 23. Good. Further, the cable holding means is not limited to the illustrated concave portion 26, but may be another shape of the concave portion. Further, the cable holding means may have a configuration other than the recessed portion as long as a portion near the distal end of the high-voltage cable can be attached and detached.

In an FBT according to another embodiment shown in FIG. 4, an inverted U-shaped portal member 29 integrally formed with the housing 21 is provided on the top of the housing 21, and the portal member 29 is provided. Thus, a hole 20 is formed. Then, a high-voltage cable 3 which is led out of the housing 21 and provided with an anode cap 5 at the tip is inserted into the hole 20 so as to be able to be pushed and pulled out.

In the FBT, when the high-voltage cable 3 is pushed into the hole 20 as shown in the drawing to bring the portion 31 near the distal end of the high-voltage cable 3 into contact with the portal member 29, the vicinity of the distal end of the high-voltage cable 3 The location 31 is held in that position to prevent the high voltage cable 3 from hanging down due to the weight of the anode cap 5. When the high-voltage cable 3 is routed, the high-voltage cable 3 may be pulled out from the hole 20.

As in this embodiment, if the cable holding means is provided on the top of the housing 21, the portion 31 near the tip of the high-voltage cable 3 is held on the top of the housing 21. The situation in which the anode cap 5 and the anode grip 4 hit other electric components and electronic components is reliably prevented.

In the embodiment described with reference to FIG. 4, although the cable holding means is formed by the hole 20 of the portal member 29, this point is different from the other parts of the housing 21, such as the bracket 23 and the other parts. The cable holding means may be formed by a hole formed at the position of (1).

[0027]

[Effect of the invention]

 In the FBT of the present invention, the portion near the tip of the high-voltage cable is held on the housing side to prevent the high-voltage cable from drooping. Therefore, the anode cap attached to the tip of the high-voltage cable is used for electrical components and electronic components. Eliminates the risk of knocking down or damaging components, and also prevents the anode grip provided at the end of the high-voltage cable from touching electronic components, etc., and causing electronic components to be electrostatically destroyed. . In particular, since the wiring board is not used for holding the high-voltage cable, the price is easy and the wiring board is not enlarged.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a main part of an embodiment of an FBT according to the present invention.

FIG. 2 is a schematic perspective view of a main part showing a state where a high-voltage cable is held by the FBT of FIG. 1 itself.

FIG. 3 is an explanatory view of an attaching / detaching operation of a high-voltage cable.

FIG. 4 is a schematic perspective view of a main part of another embodiment of the FBT according to the present invention.

FIG. 5 is a plan view schematically showing a wiring board on which an FBT and other components are mounted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wiring board 2 Flyback transformer 3 High voltage cable 5 Anode cap 20 Hole 21 Housing 22 Boss 23 Bracket 26 Depressed portion 27 Holding portion 28 Doorway 29 Gate member 31 Near point of high voltage cable tip

Claims (9)

[Utility model registration claims] 1. A flyback transformer, comprising: a casing from which a high-voltage cable having an anode cap at an end thereof is led out; 2. The flyback transformer according to claim 1, wherein said cable holding means comprises a concave portion having a clamping portion capable of clamping a portion near the tip of said high-voltage cable and an entrance through which the high-voltage cable enters and exits. 3. The flyback transformer according to claim 2, wherein the entrance is narrower than the holding portion. 4. The casing according to claim 2, wherein a boss into which the mounting screw is screwed and a plate-like bracket for reinforcing the boss are provided, and the bracket is provided with the cable holding means. Item 3. A flyback transformer according to Item 3. 5. A cable for inserting a high-voltage cable having an anode cap at an end thereof from which the high-voltage cable is led out so as to be able to be pushed and pulled out, and to hold a portion near the tip of the pushed high-voltage cable. A flyback transformer having a holding means. 6. The flyback transformer according to claim 5, wherein the cable holding means is a hole provided in the housing and through which a high-voltage cable is inserted. 7. The flyback transformer according to claim 6, wherein the hole is formed by a portal member formed integrally with the housing. 8. The flyback transformer according to claim 7, wherein the portal member is provided on a top of the housing. 9. The flyback transformer according to claim 1, which is mounted on a wiring board provided with a control circuit for a CRT.