JPH0744010Y2 - Molded products for flyback transformers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a high voltage coil for forming a part of a flyback transformer for applying a high DC voltage to a cathode ray tube such as a television picture tube and a display device. The present invention relates to a molded product for a flyback transformer, which comprises a coil bobbin for high voltage on which is wound and a holder to which accessory parts such as a high voltage capacitor are attached.

[Conventional technology]

Generally, a flyback transformer has a low voltage coil wound around a low voltage coil bobbin in a transformer case and a plurality of high voltage windings wound around a high voltage coil bobbin located outside each low voltage coil via a high voltage diode. By accommodating a high-voltage coil that is connected in series and arranging a core from the inside of the low-voltage coil bobbin to the transformer case, by applying a flyback transformer pulse synchronized with the horizontal deviation cycle to the low-voltage coil. A high voltage is added and rectified to each high voltage winding of the high voltage coil to generate a high voltage output voltage, which is output to a cathode ray tube through an anode lead wire.

Here, an electric circuit diagram of the flyback transformer configured as described above is shown in FIG. 7 and will be described.

In the drawing, reference numeral 1 denotes a flyback transformer, and the flyback transformer 1 has an outer shape formed by a transformer case (not shown) formed in a cylindrical shape with a lid by an insulating resin material, and the inside of the transformer case will be described later. The low-voltage coil 2, the high-voltage coil 3 and the high-voltage diode 5 are housed 1 and molded with an insulating resin.

Reference numeral 2 denotes a low voltage coil, and the low voltage coil 2 is wound around a low voltage coil bobbin (not shown) by section winding. 3, 3 ... Show high voltage coils, and each high voltage coil 3
Is formed by coaxially winding a plurality of high-voltage windings around a high-voltage coil bobbin 14, which will be described later, or section winding. Reference numeral 4 denotes a core, and the core 4 is provided between each of the high voltage coils 3 and the low voltage coil 2. 5,5,
Indicates a high voltage diode, and each high voltage diode 5 is
The high-voltage diodes 5A on the highest pressure side are alternately connected in series with the respective high-voltage windings constituting each of the high-voltage coils 3, and the high-voltage resistor 6 has a high-voltage resistance 6
It is connected to the anode lead wire 7 via the so as to apply a high DC voltage to the cathode ray tube 8.

Reference numeral 9 denotes a high-voltage capacitor that is provided between the cathode of the highest-voltage diode 5A and the ground 10. The high-voltage capacitor 9 is designed to smooth the high-voltage output and prevent voltage fluctuations.

Reference numerals 11 and 12 denote a focus voltage resistor and a screen voltage resistor which are variable resistors, and the focus voltage resistor 11 and the screen voltage resistor 12 are connected in series between the cathode of the highest voltage diode 5A and the ground 10. ing. The resistors 11 and 12 are housed in a focus pack (not shown) attached to the transformer case by resin molding.

In the flyback transformer 1 configured as described above, the flyback pulse is input to the low voltage coil 2 from the horizontal deflection circuit (not shown), so that the high voltage coil 3
A high voltage determined by the number of coil turns is induced in each of the high voltage windings, and the high voltage is added and rectified by each high voltage diode 5, and a DC high voltage is supplied from the anode lead wire 7 to the cathode ray tube 8.
Output to.

On the other hand, the focus voltage resistor 11 outputs a focus voltage determined by the voltage division ratio and supplies the focus voltage to the cathode ray tube 8 via a focus voltage lead wire (not shown). On the other hand, the screen voltage resistor 12 outputs a screen voltage determined by the voltage division ratio, and the screen voltage is supplied to the cathode ray tube 8 via a screen voltage lead wire (not shown).

In the flyback transformer 1 configured as described above, a holder to which a high voltage coil bobbin around which each high voltage coil 3 is wound and a connecting component such as a high voltage capacitor 9, a high voltage resistor 6 and an anode lead wire 7 are attached. It is known that a molded product for a flyback transformer consisting of and is housed inside a transformer case.

Here, a molded product for a flyback transformer is shown in FIGS. 8 to 10 and described.

Reference numeral 13 denotes a flyback transformer molded product, which is a high voltage coil bobbin 14 described later.
And a holder 16 are provided.

Reference numeral 14 denotes a high-voltage coil bobbin formed of an insulating resin material in a cylindrical shape. The body part of the high-voltage coil bobbin 14 is a winding part 14A around which a plurality of the high-voltage coils 3 are wound. Each high voltage diode 5 is provided on one side.
Are mounted via a plurality of terminal pins (not shown) to form high voltage diode mounting portions 14B, 14B ,. 1
5,15, ... Depict concave locking projections provided to mount the holder 16, and each of the concave locking projections 15 is located on the adjacent surface side of each high voltage diode mounting portion 14B in the axially upper and lower positions. There are a total of four protruding pieces, one for each pair. A locking hole portion 15A and a locking portion 15B are formed in the concave locking projection 15. The concave locking protrusions 15 are integrally formed when the high voltage coil bobbin 14 is molded.

Reference numeral 16 denotes a holder formed in the shape of a stepped plate. On the front surface side of the holder 16, there are provided a total of four capacitor holding arm portions 16 in pairs at the upper and lower positions to hold the high voltage capacitors 9.
A, 16A, ... and resistance holding portions 16B, 16 holding the high voltage resistance 6
B and a cylindrical lead wire holding portion 16C that holds the anode lead wire 7 are formed. 17, 17 ... Show convex locking projections for attaching the holder 16 to the high-voltage coil bobbin 14, and the convex locking projections 17 correspond to the concave locking projections 15 on the back side of the holder 16. A total of four pairs are provided at upper and lower positions, and each of the convex locking protrusions 17 is formed of an arm portion 17A and a locking claw portion 17B provided on the tip side of the arm portion 17A. The locking claw portions 17B are formed so as to face each other in the longitudinal direction. The convex locking projections 17 are formed integrally with the holder 16 when the holder 16 is molded, like the concave locking projections 15.

Molded product for flyback transformer 13
After the connection parts such as the high-voltage capacitor 9, the high-voltage resistor 6, the anode lead wire 7 and the like are attached to the holder 16, the concave locking protrusions 15 of the high-voltage coil bobbin 14 are connected to the convex locking protrusions of the holder 16. By engaging 17 with the convex locking protrusion 17
By locking the locking claw portion 17B to the locking portion 15B of each concave locking projection 15, the holder 16 and the high voltage coil bobbin 14 are fixed to form the flyback transformer molded product 13,
By housing the flyback transformer molded product 13 in the transformer case, it is possible to improve workability in manufacturing the flyback transformer 1.

[Problems to be solved by the device]

Here, when the holder 16 of the above-mentioned conventional flyback transformer molded product 13 is molded, the direction in which the molding die is removed is set to the 11th direction.
It will be described with reference to FIGS.

FIG. 11 shows the direction in which the mold is removed when the holder 16 is viewed from the front, and molds C and D are each a pair of capacitor holding arm portions.
16A is formed so as to be pulled out in the left and right directions in the drawing, and the die C'is formed so as to form a lead wire holding portion 16C and is pulled out in the left direction in the drawing. FIG. 12 shows the die removing direction when the holder 16 is viewed from the side, and as in FIG. 11, the die C, C ′,
In addition to punching in the left and right directions of D, gold et al. A forms two flat portions on the front side of the holder 16 and the resistance holding portions 16B and 16B, and pulls out in the upward direction in the drawing. The outer surface of the holder 16 has a flat surface on the back side and the convex locking projections 17, 17, ..., And is drawn out downward in the drawing. FIG. 13 shows the die removing direction when the holder 16 is viewed from the rear side, and the square rod-shaped die E,
The engaging portion 17B of the convex engaging protrusion 17 is formed by F and is pulled out downward in the drawing.

As explained above, the direction of removing the mold according to the prior art is
There is a problem that it is necessary to remove A to F in six directions, and only one holder 16 can be taken for one set of molding dies.
There is a problem that productivity is poor and cost is high.

The present invention has been made in view of the above-mentioned prior art, and by improving the shape of the holder, it is possible to reduce the direction in which the mold is pulled out and to make a mold capable of taking a large number of holders. It is an object of the present invention to provide a molded product for a flyback transformer that is cost effective and cost-effective.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, the feature of the configuration adopted by the present invention is that the high-voltage coil bobbin is provided with a plurality of convex locking projections each having locking claws for preventing slippage at both axial ends. The rear side of the holder is provided with a plurality of concave locking projections having locking holes for locking the locking claws of the locking projections.

[Action]

With the above configuration, it is possible to reduce the number of molding dies at the time of molding the holder, and it is possible to reduce the die drawing direction, so that it is possible to take multiple holders with one set of molding dies. Become.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. In the embodiments, the same components as those of the above-described conventional technique are designated by the same reference numerals, and the description thereof will be omitted.

First, in FIG. 1 to FIG. 3, reference numeral 21 denotes a flyback transformer molded product of the present embodiment, and the flyback transformer molded product 21 is almost the same as the flyback transformer molded product 13 described in the prior art. It is similarly configured.

That is, reference numeral 22 denotes a high-voltage coil bobbin formed of an insulating resin in a cylindrical shape. The high-voltage coil bobbin 22 has a plurality of high-voltage coils 3 wound around its body portion, similar to the high-voltage coil bobbin 14 described in the prior art. It is composed of a wound winding portion 22A and a plurality of high voltage diode mounting portions 22B, 22B, ... 23,2
Denoted by 3 are the convex locking projections of the present embodiment provided for mounting the holder 24. The convex locking projections 23 are formed on the adjacent surface sides of the high voltage diode mounting portions 22B in the axial direction. A total of four pieces are projected at each of the upper and lower positions. Each of the convex locking protrusions 23 is formed of an arm portion 23A and a locking claw portion 23B provided on the distal end side of the arm portion 23A, and each locking claw portion 23B is opposite to the prior art. The convex locking projections 23 are formed so as to face outward in the axial direction, and are integrally formed when the high voltage coil bobbin 22 is molded.

Reference numeral 24 denotes a holder formed of an insulating resin material in the form of a stepped plate. The holder 24 has a capacitor holding arm portion 24A for holding the high voltage capacitor 9 on the front surface in the same manner as the holder 16 described in the prior art. , 24A, ..., Resistance holding portions 24B, 24B, ... Holding the high voltage resistance 6, and a lead wire holding portion 24C holding the anode lead wire 7. Denoted by 25, 25, ... Denote the concave locking projections of the present embodiment provided for attaching the holder 24 to the high-voltage coil bobbin 22, and each of the concave locking projections 25 is provided on the rear surface side of the holder 24 with the convex projections. A total of four pairs of protrusions are provided at upper and lower positions with respect to the locking protrusions 23, and a locking hole portion 25A and a locking portion 25B are formed in each concave locking protrusion 25. The concave locking projections 25 are integrally formed when the holder 24 is molded.

Molded product 21 for flyback transformer configured in this way
In, by fitting the concave locking projections 25 of the holder 24 into the convex locking projections 23 of the high voltage coil bobbin 22, the locking claw portions 23B of the convex locking projections 23 are locked in the concave shapes. The high voltage coil bobbin 22 is locked to the locking portions 25B of the protrusions 25, respectively.
Molded product for flyback transformer with holder and holder 24 fixed
Form 21.

The operation of the flyback transformer manufactured by using the flyback transformer molded product 21 thus formed is almost the same as that of the conventional technique. Furthermore, by using the flyback transformer molded product 21 when assembling the flyback transformer, there is no change in that workability can be improved as in the conventional case.

However, in the step of molding the holder 24 of the flyback transformer molded product 21 of the present embodiment, it can be manufactured by using a molding die as shown in FIGS. 4 to 6.

Here, the drawing direction of the molding die of the holder 24 of the molded product 21 for the flyback transformer of this embodiment will be described with reference to FIGS. 4 to 6.

FIG. 4 shows a mold drawing direction when the holder 24 is viewed from the front, and molds C and D each have a pair of capacitor holding arm portions.
24A is formed so as to be pulled out in the left and right directions in the drawing, and the die C'is formed so as to form a lead wire holding portion 24C and pulled out in the left direction in the drawing. FIG. 5 shows the die pulling direction when the holder 24 is viewed from the side, and as with FIG. 4, the die C, C ′,
In addition to punching in the left and right directions of D, the die A and the like form the two flat portions on the front side of the holder 24 and the resistance holding portions 24B, 24B, and pull the die B upward. The outer shape of the flat surface of the holder 24 on the back side and the concave locking projections 25, 25, ... Is formed so as to be pulled out in the downward direction of the drawing. Further, a mold protrusion is formed on the lower side of the mold C so as to form the locking hole portion 25A and the locking portion 25B of each concave locking protrusion 25 in the mold C. FIG. 6 shows the drawing direction of the mold when the holder 24 is viewed from the rear side, and as described in FIG. 5, the mold C and D have locking holes 25A of the concave locking projections 25 and locking. A mold protrusion that forms the portion 25B is formed so that the molds C and D can be pulled out in the left and right directions in the drawing.

As described above, the die removing direction according to this embodiment is
Since the holder 24 can be formed only by pulling out in the four directions A to D, it is not necessary to form the square rod-shaped mold for forming the locking portion and pull out in the E and F directions as in the prior art. As a result, a large number of holders 24 can be obtained by using one set of molding dies, and productivity can be improved and the number of coils can be reduced.

[Effect of device]

As described in detail above, according to the present invention, a plurality of convex locking projections having locking claws for preventing slipping are provided at both axial ends of the high-voltage coil bobbin, and the rear side of the holder is provided with the convex locking projections. Since the plurality of concave locking projections having the locking holes for locking the locking claws of the respective locking projections are formed to project, the number of molding dies during the holder molding and the pulling direction Since the number of holders can be reduced with a single set of molding dies, productivity can be reliably improved, and cost can be reduced compared to the conventional method. it can.

[Brief description of drawings]

1 to 6 show an embodiment of the present invention, FIG. 1 is a perspective view of a molded product for a flyback transformer, and FIG.
FIG. 5 is a side view showing the coil bobbin for high voltage and the holder in a disassembled state, FIG. 3 is a bottom view of FIG. 2, FIG. 4 is an explanatory view showing a die removing direction when the holder is viewed from the front, and FIG. FIG. 4 is an explanatory view showing the die-pulling direction as seen in the direction of the arrow VV in FIG. 4, FIG. 6 is an explanatory view showing the die-pulling direction as seen from the back surface of the holder, and FIGS. 7 to 13 Shows a prior art, FIG. 7 is an electric circuit diagram of a flyback transformer, FIG. 8 is a perspective view of a molded product for a flyback transformer, and FIG. 9 is a disassembled state of a coil bobbin for high voltage and a holder of FIG. FIG. 10 is a side view, FIG. 10 is a bottom view of FIG. 9, FIG. 11 is an explanatory view showing a die removing direction when the holder is viewed from the front, and FIG. 12 is a cross-sectional view taken along arrow XII-XII in FIG. And FIG. 13 is an explanatory view showing the die removing direction as seen from the back side of the holder. 3 ... High voltage coil, 6 ... High voltage resistor, 9 ... High voltage capacitor, 21 ... Flyback transformer molded product, 22 ...
… High voltage coil bobbin, 23 …… Convex locking projection, 23A ……
Arms, 23B ... locking claws, 24 ... holders, 25 ... concave locking projections, 25A ... locking holes, 25B ... locking parts.

Claims (1)

[Scope of utility model registration request] 1. A high-voltage coil bobbin formed of a resin material in a cylindrical shape, around which a high-voltage coil is wound, and a flat plate-shaped resin material, on the front side of which a high-voltage capacitor and a high-voltage resistor are formed. In a molded product for a flyback transformer, which is attached and has a holder whose back side is fixed to the high-voltage coil bobbin, the high-voltage coil bobbin has a plurality of convex engagement members each having locking claw portions at both ends in the axial direction for retaining. And a plurality of concave locking projections having locking holes for locking the locking claws of the locking projections are provided on the back side of the holder. Molded product for flyback transformer.