JP2621397B2 - Flyback transformer - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a flyback transformer.

FIG. 6 is a diagram showing a conventional flyback transformer. In FIG. 6, 1 is a core having a gap, 2 is a primary coil, 3 is a secondary coil, 4 is a case cover housing the primary coil 2 and the secondary coil 3, and 5 is an electric resistor printed thereon. The ceramic substrate 6 is a unit frame accommodating the ceramic substrate 5. The unit frame 6 has a rectangular dish shape. The ceramic substrate 5 is fixed to a concave portion of the unit frame 6 with a casting resin 7. The unit frame 6 is provided with a through hole 6a and a rib 6b. 8 is a ceramic substrate 5
A slider 9 that slides on the electric resistor printed thereon is a rotatable shaft attached to the ceramic substrate 5 and protrudes from the outer wall plate of the unit frame 6 through the through hole 6a. A slider 8 is attached to the shaft 9. A variable resistor is formed by the shaft 9, the slider 8, and the electric resistor. Reference numeral 10 denotes a casting resin containing a flame-retardant material.

An assembling method and operation of the conventional flyback transformer configured as described above will be described.

The shaft 9 is inserted into the through hole 6a from the concave portion to the convex portion of the unit frame 6, and the ceramic substrate 5 is fitted into the unit frame 6. Next, the casting resin 7 is poured into the unit frame 6 and the ceramic substrate 5 is fixed to the unit frame 6. At that time, the casting resin 7 flows into the portion of the slider 8 and solidifies to
The casting resin 7 is prevented from flowing further toward the slider 8 by the rib 6b so as not to move. Next, the secondary coil 3 and the ceramic substrate 5 are connected by the lead wire 5a,
The unit frame 6 is attached to the case cover 4. Next, the casting resin 10 was poured into the unit frame 6 and the case cover 4 to insulate the primary coil 2 and the secondary coil 3 from the ceramic substrate 5 and to fix the unit frame 6 to the case cover 4. When adjusting the focus, use the shaft 9
Is turned to move the slider 8 to change the voltage applied to the circuit connected to the secondary coil 3 to adjust the focus of the electron beam emitted from the electron gun.

However, in the conventional configuration, the ceramic substrate 5
Since the secondary coil 3 and the secondary coil 3 are joined by a lead wire, the number of steps is increased and the productivity cannot be improved.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a flyback transformer capable of easily connecting a substrate and a secondary coil and improving productivity.

Means for Solving the Problems In order to achieve this object, the present invention slides the electric resistor, and a substrate provided with a first pin terminal connected to the electric resistor, and the electric resistor. A slider, a unit frame accommodating a shaft for moving the slider, a bobbin provided with a primary coil and a secondary coil and a second pin terminal electrically connected to the secondary coil, and a bobbin. A case cover for accommodating the attached core, and a conductive member for inserting the first pin terminal and the second pin terminal, respectively, forming a cylindrical portion on one of the case cover and the unit frame and forming the cylindrical portion on the cylindrical portion. A first pin terminal is provided by providing a plurality of grooves concentrically, providing a fitting portion into which the groove fits, arranging conductive members in the cylindrical portion, and fitting the fitting portion with the groove of the cylindrical portion. And the second pin terminal is inserted into the conductive member The first pin terminal and the second pin terminal are inserted into the conductive member in different positions in the radial direction of the conductive member.

Operation With this configuration, the substrate and the secondary coil are electrically connected via the conductive elastic body, and a plurality of grooves are formed concentrically in the cylindrical portion, so that the conductive member to the outside of the case cover and the unit frame are formed. The creepage distance can be increased, and furthermore, the first pin terminal and the second pin terminal can be inserted into the conductive member at different positions in the radial direction of the conductive member, thereby reducing the axial thickness of the conductive member. it can.

FIG. 1 is a side sectional view showing a flyback transformer according to an embodiment of the present invention. In FIG. 1, reference numeral 11 denotes a core made of ferrite or the like, and reference numerals 12 and 13 denote a primary coil and a secondary coil, respectively.
Is wound around a bobbin 14 attached to the core 11. Further, the bobbin 14 is provided with a sharp pin terminal 13a electrically connected to the secondary coil 13. Reference numeral 15 denotes a case cover provided to protect the primary coil 12 and the secondary coil 13, and the case cover 15, the core 11, and the bobbin 14 are provided.
A resin is interposed between them. The case cover 15 is provided with a cylindrical portion 15a protruding outward, and concentric ribs 15b are provided around the cylindrical portion 15a so as to surround the cylindrical portion 15a. Reference numeral 16 denotes a unit frame, and the unit frame 16 has an appearance as shown in FIG. In FIG. 2, reference numerals 16a and 16b denote through holes provided in the unit frame 16, reference numeral 17 denotes a back cover of the unit frame 16, and the back cover 17 surrounds the cylindrical portion 17a and the cylindrical portion 17a as shown in FIG. A groove 17b is provided concentrically, and a cylindrical portion 15a fits into the cylindrical portion 17a, and a rib 15b fits into the groove 17b. 1
Sliders 8 and 19 are attached to the shaft and project from the through holes 16a and 16b to the outside, 20 is a ground terminal, 21 is connected to a cathode ray tube (hereinafter abbreviated as CRT) focus circuit (not shown). Reference numeral 22 denotes a lead connected to the CRT cathode grid. 3 and 4 are exploded perspective views of the unit frame 16. FIG. In FIGS. 3 and 4, reference numeral 23 denotes a ceramic substrate attached to the unit frame 16. The ceramic substrate 23 is provided with a ground terminal 20 and a sharp pin terminal 24. The pin terminal 24 is inserted into the cylindrical portion 17a. As shown in FIG. 5, electric resistors 25, 26, and 27 are formed on the ceramic substrate 23, the lead wire 22 is connected to the electric antibody 25, and the lead wire is 21 is connected. One end of the electric antibody 27 is connected to the ground terminal 20, and the other end is connected to the pin terminal 24. A shaft 19 is attached to an end 25 a of the electric antibody 25, and a slider provided on the shaft 19 slides on the electric resistor 27. End 26a of electric resistor 26
Also, a shaft 18 is attached to the shaft 18, and a slider provided on the shaft 18 slides on the electric resistor 27. 28 is the cylindrical part 15a
The conductive rubber provided inside the conductive rubber 28 has pin terminals
13a and the pin terminal 24 are pierced.

The assembling method and operation method of the present embodiment configured as described above will be described below.

First, the conductive rubber 2 is attached to the cylindrical portion 15a provided on the case cover 15.
5 is inserted, and simultaneously with the insertion, the pin terminal 13a is pierced into the conductive rubber. Next, install the ceramic substrate in the unit frame 16 in advance.
23 and the like are stored, and the unit frame 16 is attached to the case cover 15 by inserting the rib 15b into the groove 17b. At the same time, the pin terminals 24 are pierced into the conductive rubber 28 to electrically connect the ceramic substrate 23 and the secondary coil 13. Finally the case cover
Pour resin into 15 and mold. At this time, if the bonding strength between the case cover 15 and the unit frame 16 is not sufficient, a small amount of adhesive may be used. By rotating the shaft 19, the number of electrons emitted from the electron gun can be adjusted, and by rotating the shaft 18, the focus of the electron beam can be adjusted.

As described above, according to the present embodiment, when attaching the unit frame 16 to the case cover 15, the pin terminals 13a protruding from the secondary coil 13 and the pin terminals 2 protruding from the ceramic substrate 23 are provided.
4 is a conductive rubber provided in the cylindrical portion 15a of the case cover 15.
28, the secondary coil 13 and the ceramic substrate
Since the electrical connection of the 23 can be performed, the secondary coil 13 and the ceramic substrate 23 do not need to be connected by the lead wire, so that the manufacturing process can be reduced. Even if the resin poured into the case cover 15 expands due to heat, the conductive rubber 28 is interposed between the resin and the ceramic substrate 23, so that no stress is applied to the ceramic substrate 23, and 23 does not bend or break. In this embodiment, a ceramic substrate is used as the substrate, but any substrate can be used as long as it can withstand high pressure.

Advantageous Effects of the Invention The present invention provides a substrate and a secondary coil with sharp pin terminals, and when the unit frame containing the substrate and the case cover containing the secondary coil are coupled, both pin terminals show conductivity and elasticity. By piercing the conductive member with force, the substrate and the secondary coil can be electrically connected via the conductive elastic body, so that the number of steps can be reduced and the productivity can be improved. . Also, since the substrate is not covered with the resin, the stress due to the change in the volume of the resin is not transmitted to the substrate, and the substrate does not bend or crack. Since the creepage distance to the outside of the case cover and the unit frame can be increased, leakage from the pin terminal to the outside can be prevented, and furthermore, the first pin terminal and the second pin terminal can be inserted into the respective conductive members. By reducing the thickness of the conductive member in the axial direction by changing the position in the radial direction of the conductive member,
It has an excellent effect of reducing the size of the flyback transformer.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a flyback transformer in one embodiment of the present invention, FIG. 2 is a perspective view showing a unit frame of the flyback transformer, FIGS. 3 and 4 are exploded perspective views of the same, and FIGS. FIG. 1 is a plan view showing a ceramic substrate of a flyback transformer according to one embodiment of the present invention, and FIG. 6 is a side sectional view showing a conventional flyback transformer. 11: Core 12: Primary coil 13: Secondary coil 13a: Pin terminal 14: Bobbin 15: Case cover 15a: Cylindrical part 15b: Rib 16: Unit frame 16a, 16b: Through hole 17 Back cover 17a Cylindrical portion 17b Groove 18, 19 Shaft 20 Earth terminal 21, 22 Lead wire 23 Ceramic substrate 24 Pin terminal 25, 26, 27 Electric Resistor 28 ... conductive rubber

Claims (2)

(57) [Claims] An electric resistor is formed, a substrate provided with a first pin terminal connected to the electric resistor, a slider sliding on the electric resistor, and the slider. A unit frame for housing a shaft to be moved, a bobbin provided with a primary coil and a secondary coil and provided with a second pin terminal electrically connected to the secondary coil, and a case for housing a core to which the bobbin is attached A cover, and a conductive member into which the first pin terminal and the second pin terminal are inserted. A cylindrical portion is formed on one of the case cover and the unit frame, and is concentric with the cylindrical portion. Are provided with a plurality of grooves, and the other is provided with a fitting portion in which the grooves fit,
The first pin terminal and the second pin terminal are inserted into the conductive member by disposing the conductive member in the cylindrical portion and fitting the groove of the cylindrical portion with the fitting portion. The flyback transformer is characterized in that both pins are electrically connected. 2. The flyback transformer according to claim 1, wherein insertion positions of the first pin terminal and the second pin terminal into the conductive member are different in a radial direction of the conductive member.