JP2663315B2 - Flyback transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flyback transformer used for a television receiver or the like.

[0002]

2. Description of the Related Art As is well known, a television receiver or a display device is provided with a flyback transformer.
A high voltage output voltage is applied to the anode of the cathode ray tube via an anode lead from a high voltage coil (secondary coil) constituting the flyback transformer. In recent years, a so-called anode lead post-attaching method has been increasing in which the anode lead is post-attached to a flyback transformer to facilitate installation. FIG. 9 is an exploded perspective view showing an operation state in which the anode lead 11 is mounted on the anode lead holder 13 in the anode lead retrofitting method. In the figure, an anode lead holder 13 is molded from an elongated cylindrical insulating resin, and a centrally located bottom surface of the anode lead holder 13 has a pin-shaped conductor terminal connected to a high-voltage coil.
15 is provided, and protrudes upward from the bottom surface of the anode lead holder 13 in the cylinder. The anode lead 11 is provided at its tip with a connector 14 for fitting and connecting to the conductor terminal 15, the claws 17 of the connector 14 press the anode lead 11, and the conductor 16 of the anode lead 11 is soldered to the connector 14. Is connected to Also the anode lead
11 is provided with a rubber cap 9 molded of a silicone resin or the like. The anode lead 11 is inserted into the anode lead holder 13, the connector 14 and the conductor terminal 15 are fitted and connected, and the rubber cap 9 is attached to the anode lead holder. It is configured to cover the upper end surface 19 of the thirteen.

[0003]

As described above, since a high voltage is applied to the anode lead 11 from a high voltage coil, it is necessary to increase the creepage distance in order to secure the dielectric strength of the anode lead 11. The anode lead holder 13 made of resin is set long. In the conventional flyback transformer, the connector 14 and the conductor terminal 15 are required to be tightly fitted to each other because the method uses the frictional force of the fitting to prevent the connector 14 and the conductor terminal 15 from coming off. Even when the anode lead 11 is pushed into the lead holder 13, the anode lead 11 has a low rigidity, so that the anode lead 11 bends. Therefore, there is a problem that connection is troublesome and workability is poor. To remedy this workability problem, the connector 14
And the conductor terminal 15 may be loosely fitted.However, there is a problem that the anode lead 11 comes off when a tensile force is applied to the anode lead 11 for some reason. The connection state with 15 was also incomplete, and there was a problem in connection reliability.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to easily mount an anode lead on an anode lead holder of a flyback transformer when the anode lead is inserted into the anode lead holder. It is an object of the present invention to provide a flyback transformer that can prevent the anode lead from coming off even when it is added and can be securely attached and connected.

[0005]

The present invention is configured as follows to achieve the above object. That is, the present invention provides a flyback transformer in which a conductor terminal is provided at the bottom of a cylindrical anode lead holder, the anode lead is inserted into the anode lead holder, and the conductor of the anode lead is connected to the conductor terminal of the anode lead holder. In the lower part of the anode lead holder, a resilient gill piece having an elastic restoring property is provided with an operating surface protruding inward and protruded downward, and a locking surface is provided at a lower end portion of the operating surface. At the lower end of the anode holder
Indicates that the cylindrical part of the conductor terminal connection part with a bottomed cylindrical shape fits in an airtight manner
It is installed, from the bottom side inside the bottom wall of this conductor terminal connection part
Springy gold formed by inwardly forming an upwardly extending contact piece
Metal terminal is accommodated, and the spring metal terminal is connected to the conductor terminal.
It is conductive, 該A the tip end of the anode lead
A member having a locking step protruding outward from the outer peripheral surface of the node lead is attached.
A metal cap is provided and the conductor of the anode lead
When the anode lead is inserted into the anode lead holder and inserted into the anode lead holder, the locking step on the anode lead side pushes and expands the operating surface of the gill piece, and the gill is moved over the operating surface. The locking step is locked to the locking surface by the elastic restoring force of the piece, and the metal cap is locked.
Is pressed against the contact piece of the spring metal terminal with spring elasticity
The conductor of the anode lead and the conductor terminal are electrically connected.
It is characterized by having been done.

[0006]

When the anode lead is inserted into the anode lead holder, the leading end locking step of the anode lead acts on the operating surface of the anode lead holder and advances while pushing the gill piece to lock the anode lead. When the step exceeds the operating surface of the gill piece, the gill piece returns to its original state due to the elastic restoring force, and the locking step stops and locks on the locking surface. At this time,
The cap presses against the springy metal terminal and leads the anode lead.
The body is closed via a metal cap and a springy metal terminal.
Conduction to the conductor terminals on the bottom side of the lead holder.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of a fitting mounting structure of an anode lead 11 and an anode lead holder 13 of a flyback transformer according to the present invention. FIG. 2 is a perspective view of the anode lead holder 13 of the flyback transformer of the present embodiment. In these figures, the anode lead holder 13 is composed of a cylindrical body 8 provided with an enlarged cylindrical wall 17 protruding outward at the lower end side, and a conductor terminal connecting portion 21 to which the conductor terminals 15 are connected. The cylindrical body 8 of the anode lead holder 13 is formed of a rigid cylindrical body of an insulating resin molded body.
As shown in FIG. 5, one or more elastically resilient members are provided from the step portion 5 of the enlarged cylindrical wall 17 (three at circumferentially equal intervals in the embodiment).
Gill pieces 18 project downward. This gill piece 18 has an inclined operating surface that protrudes inward as it goes downward.
The lower end surface of the operation surface 10 is a locking surface 19. The conductor terminal connecting portion 21 is formed of a resin and has a cylindrical wall 27 provided with a flange 26 for engaging with the lower end surface 7 of the cylindrical body 8 of the anode lead holder 13.
A taper 6 is formed at the tip of the to facilitate fitting with the cylindrical body 8. A spring metal terminal 28 is accommodated in the cylindrical wall 27. The spring metal terminal 28 is formed by bending a plurality of contact pieces 30 upward in a sea-star shape from the bottom surface 29 and forming each contact piece 30 inwardly with a spring property, and forming the bent portion on the anode lead 11 side described later. This is a conductive connection portion with the metal cap 24 of FIG. The conductor terminal 15 is inserted downward into the center of the bottom surface of the spring metal terminal 28,
Due to the press-fitting of the conductor terminal connection portion 21 and the conductor terminal connection portion 21 , a stable conductive connection between the spring metal terminal 28 and the conductor terminal 15 is maintained.

FIG. 5 is a perspective view of the anode lead 11, and FIG. 6 is a bottom view of the anode lead 11 of FIG.
The cross-sectional view is shown with the rubber cap 9 omitted . In these figures, a resin molded cap 23 having a locking step 20 projecting outward is provided at the lower end side of the anode lead 11, and a metal cap 24 covers almost the entire outer periphery of the resin molded cap 23. The metal cap 24 is connected to the conductor 16 of the anode lead 11 by solder 25. This resin molding cap 23
Is provided with a squash 32 to prevent the anode lead 11 from rotating.
An engagement receiver 36 for engaging with the squash 32 is formed, and the engagement receiver 36 and the squash 32 are engaged to prevent rotation of the anode lead 11. Further, the surface of the metal cap 24 is formed smoothly without any protrusion.

An anode lead 11 is used as an anode lead holder.
When the anode lead 11 is inserted into the anode lead holder 13 when the anode lead 11
The tip side locking step 20 acts on the operating surface 10 of the anode lead holder 13 and pushes and expands the gill pieces 18, and the locking step 20 on the anode lead 11 side moves the operating surface 10 of the gill pieces 18. When it exceeds, the gill piece 18 returns to its original state due to elastic restoring force, and the locking step 20
Are locked by the locking surface 19.

The metal cap 24 at the tip of the anode lead 11 is connected to a spring metal terminal 28 (contact piece) of the conductor terminal connecting portion 21.
The contact piece 30 is connected by contact, but the contact area between the two pieces 24 and 28 is large, and the contact piece 30 is pressed by the spring elasticity, so that the conductive connection is ensured.

According to the present embodiment, when the anode lead 11 is mounted on the anode lead holder 13,
Since the locking step 20 on the distal end side of 11 is locked by the locking surface 19 of the gill piece 18 of the anode lead holder 13, the anode lead 11 does not fall out of the anode lead holder 13. Therefore, for some reason the anode lead
Even if a tensile force is applied to 11, the connection state between the metal cap 24 and the spring metal terminal 28 is securely held without being released, so that the reliability of the connection can be improved. Further, the metal cap 24 of the anode lead 11 and the contact piece 30 of the spring metal terminal 28 of the anode lead holder 13 can be connected stably only by contacting the two 24, 30. There is no need to apply a large insertion pressure to the connection 11, and therefore, the connection can be performed very easily because the anode lead 11 can be inserted and connected smoothly without bending or bending. The anode lead holder 13 is, for example, detachably mounted on a bobbin of a high-voltage coil via a connecting member, is integrated with a coil of a transformer, is housed in a transformer case, and in the housed state, epoxy or the like injected into the transformer case It is embedded and fixed in the transformer case by the casting resin. However, since the enlarged cylindrical wall 17 of the cylindrical body 8 and the conductor terminal connecting portion 21 are both resin-molded with high precision, the dimensional accuracy is good. There is no gap in the fitting portions 17 and 21 , and there is no fear that the casting resin enters the interior through the fitting portion when the casting resin is injected.

Further, since the surface of the metal cap 24 is formed smoothly without projections, the metal cap 24 is not damaged on the anode lead holder 13 side when the metal cap 24 is inserted into the anode lead holder 13, and It also helps prevent worker injuries.

FIG. 7 shows a fitting structure of the anode lead 11 and the anode lead holder 13 of the flyback transformer of the second embodiment. In the same figure, a second step portion 33 is provided on the lower inner peripheral surface of the enlarged cylindrical wall 17 of the anode lead holder 13, and a second enlarged cylindrical wall 34 extends downward from the second step portion 33. Formed, the cylindrical wall 27 of the conductor terminal connection portion 21
And a space 35 is formed between the second step 33 and the cylindrical wall 27. Therefore, when the anode lead 11 is inserted into the anode lead holder 13, the tip of the resilient metal terminal 28 escapes to the space between the second step portion 33 and the cylindrical wall 27. Also, the tip of the spring-like metal terminal 28 is locked and stopped by the second step portion 33 to prevent the spring from coming off.

Note that the present invention is not limited to the above-described embodiment, but can adopt various embodiments. For example, as shown in FIG. 8A, the shape of the gill piece 18 of the anode lead holder 13 is such that it protrudes inward as it goes downward while keeping its thickness parallel to the operating surface 10, or FIG. As long as the gill piece has the operating surface 10 and the locking surface 19, such as a structure in which the locking surface 19 is provided in the middle of the protruding length of the gill piece 18 as shown in FIG.

[0015]

When the anode lead is connected to the anode lead holder provided in the flyback transformer, the anode lead is located at a position closer to the tip of the anode lead than the outer peripheral surface of the anode lead.
Engaging step projecting outwardly, Ru locked locking engagement omission by locking surface gill piece of the anode lead holder. This retaining
The latch is a projection that projects outside the outer peripheral surface of the anode lead.
Since the stop step is locked, the locking step and the locking surface of the gill piece
Enlarges the contact area for locking, so it can be retained
High locking force, large pull-out force on anode lead
Prevents the anode lead from slipping out even if
Wear. Further, the as, since the anode lead stopper is achieved by engagement of the step portion and the locking surface, the pushing force of insertion into the anode lead holder anode lead and the anode lead side of the guide body anode sufficient if you give a contact pressure of only maintain good conductive connection between the conductor terminal of the lead holder side, the force to keep the continuity connection is an anode lead
The metal cap on the inside of the spring metal terminal on the conductor terminal side
To the contact piece which is curved and formed with spring elasticity
Just enough power. Therefore, since a large pushing force unlike the conventional example is not required, the anode lead can be inserted and connected smoothly without bending or bending when the anode lead is inserted, so that the connection work is easy.
And the contact between the metal cap and the spring metal terminal
The contact area with the piece is large, and both are pressed by spring elasticity
Therefore, the conductive connection is ensured . In addition,
The conductor terminal connection part is fitted and attached to the lower end of the
Inside the transformer case of the flyback transformer
Even if the casting resin is injected into the
The holder does not get inside the holder.
Anode lead after casting resin injection (casting)
It can be inserted and mounted on the holder. In other words, Ano
Without mounting the lead to the anode lead holder
Of the flyback transformer until the end of the fat casting operation
Assembly can be performed without disturbing the anode lead
Can increase the efficiency of the assembly work.
You. Further, as described above, the inside of the anode lead holder
Can prevent the casting resin from entering the
Between the metal cap on the lead side and the springy metal terminal on the conductor terminal side.
Since the contact pieces are only pressed against each other with spring elasticity,
The node lead was able to rotate in the retaining state,
Therefore, when a torsional force is applied to the anode lead
Rotating in the direction of the torsion to reduce the torsional stress
Damage, such as disconnection of the anode lead due to torsion
It is possible to prevent scratches.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a main part showing a fitting mounting structure of an anode lead and an anode lead holder of a flyback transformer according to the present embodiment.

FIG. 2 is a perspective view of an anode lead holder of the flyback transformer.

FIG. 3 is a sectional view of the anode lead holder of the flyback transformer of FIG. 2 taken along line AA.

FIG. 4 is a bottom view of a cylindrical body of the anode lead holder.

FIG. 5 is a perspective view of a main part of an anode lead of the flyback transformer according to the embodiment.

FIG. 6 is a sectional view of a main part of a lower part of the anode lead of FIG. 5;

FIG. 7 is an explanatory view of a main part showing a fitting mounting structure of an anode lead and an anode lead holder of a flyback transformer according to a second embodiment.

FIG. 8 is a structural explanatory view of a gill piece of another embodiment of the flyback transformer according to the present invention.

FIG. 9 is an exploded perspective view of a main part showing an operation state of fitting and mounting an anode lead and an anode lead holder of a conventional flyback transformer.

[Explanation of symbols]

 11 Anode lead 13 Anode lead holder 15 Conductor terminal 18 Gill piece 19 Locking surface 20 Locking step

Claims (1)

(57) [Claims] 1. A flyback transformer in which a conductor terminal is provided at the bottom of a cylindrical anode lead holder, and the anode lead is inserted into the anode lead holder and the conductor of the anode lead is connected to the conductor terminal of the anode lead holder. On the inner wall surface of the lower part of the anode lead holder, a gill piece having elastic restoring property is provided with an operation surface protruding inward and protruded downward, and a locking surface is provided at a lower end portion of the operation surface. Of the anode holder
At the lower end, the cylindrical part of the conductor terminal connection part with a bottomed cylindrical shape is airtight.
And fitted into the conductor terminal connection part from the bottom side
Springy gold formed by inwardly forming an upwardly extending contact piece
Metal terminal is accommodated, and the spring metal terminal is connected to the conductor terminal.
It is conductive, 該A the tip end of the anode lead
A member having a locking step protruding outward from the outer peripheral surface of the node lead is attached.
A metal cap is provided and the conductor of the anode lead
When the anode lead is inserted into the anode lead holder and inserted into the anode lead holder, the locking step on the anode lead side pushes and expands the operating surface of the gill piece, and the gill is moved over the operating surface. The locking step is locked to the locking surface by the elastic restoring force of the piece, and the metal cap is locked.
Is pressed against the contact piece of the spring metal terminal with spring elasticity
The conductor of the anode lead and the conductor terminal are electrically connected.
A flyback transformer characterized by being performed .