JP2568672Y2 - Focus pack structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a focus pack structure used in combination with a flyback transformer for a television receiver.

[0002]

2. Description of the Related Art In a television receiver, various voltages from a low voltage to a high voltage are required. For this reason, 100 V DC produced by a power supply circuit is input to the primary side, and a high voltage of 30 KV from the secondary side and 3 A flyback transformer that obtains a low voltage of 10 V to 200 V from the next side is used.

A high voltage (for example, 25 KV) generated by a flyback transformer is applied to an anode of a cathode ray tube, and the high voltage is appropriately reduced by a resistor to provide a focus electrode for electron beam convergence provided inside an electron gun. And a screen voltage (for example, 1 KV) to be applied to a screen electrode for color adjustment.

Conventionally, to obtain a focus voltage and a screen voltage from a high voltage generated by a flyback transformer, a unit called a focus pack shown by 2 in FIG. 3 has been used.

FIG. 3 shows a flyback transformer 1 in which a core 1a is passed through the center of a bobbin on which a winding is wound and the entire bobbin is housed in a case 1b, and a focus pack 2 attached to the outer surface thereof. . The high voltage generated by the flyback transformer 1 is connected to an anode cap (not shown) via a lead wire 1c,
It is connected to a high voltage supply point (described later) in the focus pack 2.

The focus pack 2 is made of a resin case 2a.
As shown in FIG. 4, a ceramic substrate 2 in which a high-voltage resistor 20a and variable resistors 20b and 20c are printed and wired inside
A high voltage from the flyback transformer 1 is supplied to a high voltage supply point A of the substrate 20, and a point B on the substrate 20 is grounded via a terminal 2b.
As can be seen from FIG. 3, knobs 3 and 4 for voltage adjustment are provided on the front surface of the case 2a, and a slider S1 (see FIG. 4) rotated by the knob 3 is a variable for focus voltage adjustment. The slider S2 rotated by the knob 4 is connected to the variable resistor 20c for adjusting the screen voltage.
And one ends of the sliders S1 and S2 are output to terminals 5 and 6 which penetrate the back surface of the substrate through printed wirings 20d and 20e on the substrate 20, respectively.

[0007]

FIG. 5 is a sectional view taken along line BB of FIG. 4. As can be seen from FIG. 5, the interior of the case 2a of the focus pack 2 is filled with an insulating resin 7, The high-voltage resistance portion 20a on the substrate 20 maintains electrical insulation with respect to the outside due to the insulating properties of the resin 7 and the material of the case 2a itself, but can be made of a ceramic substrate used for a relatively large substrate 20. Since the insulating resin 7 having a high flexibility has a different expansion coefficient, the substrate 20 and the insulating resin 7 may be cracked during the manufacturing process or during use, and thus the insulating property to the outside may be reduced.

SUMMARY OF THE INVENTION An object of the present invention is to provide a focus pack having excellent electrical insulation to the outside by increasing the electrical insulation of the high voltage resistor on the substrate housed in the focus pack to the outside.

[0009]

According to the present invention, in order to achieve the above object, a high-voltage resistor is formed integrally with an insulating case so that a space is formed between the insulating case and the bottom of the case. Forming a box-shaped cover for storage, and arranging a support base for supporting a variable resistor for focus voltage adjustment side by side with the cover so that a space is formed between the case and the bottom of the case, A part of the high-voltage resistor and a part of the variable resistor were connected by a lead wire, and the inside of the case was filled with an insulating resin.

[0010]

A high-voltage resistor to which a high voltage generated by a flyback transformer is applied is placed inside a box-shaped cover integrally formed with the case inside the case of the focus pack with the bottom raised. Of course, the entire inside of the case is filled with insulating resin, so the high-voltage resistor is double and triple electrically insulated by the insulating resin filled between the bottom of the cover and the case and the material of the case. .

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing the focus pack according to the present invention so that the inside can be seen, and FIG.
FIG. 2 is a cross-sectional view of FIG. 2, and FIG. 2 shows a state where the focus pack 2 is attached to a flyback transformer 1 (shown by a chain line). 1 and 2, the same reference numerals as those in FIGS. 3 and 4 indicate the same components.

In the focus pack 1, a box-shaped cover 10 is formed integrally with the case 2a inside the resin case 2a, and the high-voltage resistor 11 is housed inside the cover 10 and is arranged alongside the cover 10. The variable resistor support base 12 formed separately is arranged. Cover 10 is bottom 10
c is a box-like shape, and a leg 10
a and 10b, and as can be seen from FIG.
A space C is formed between the case and the case 2a.

On the other hand, the variable resistor support base 12 also has legs 12a and 12b on opposite side edges.
The substrate 1 is formed integrally with the case 2a by 2b and has a variable resistor printed and wired on the upper surface of the bottom 12c (see FIG. 1).
The variable resistors include sliders S1 and S1 which are rotated by knobs 3 and 4 for voltage adjustment.
2 are in contact. This variable resistor support base 12 also has a bottom 12
Space D is formed between c and case 2a.

A part of the high-voltage resistor 11 arranged inside the cover 10 and a terminal 14 of the variable resistor support 12 are connected by a tin lead 15.

As described above, when the cover 10 and the variable resistance support base 12 are arranged inside the case 2a of the focus pack 1, and then the inside of the case 2a is filled with the insulating resin 7,
As shown in FIG. 2, the resin 7 enters not only the inside of the cover 10 and the variable resistor support base 12, but also the outside and lower spaces C and D thereof. For this reason, the high-resistance element 11 to which a high voltage of about 25 KV generated by the focus pack 1 is applied is insulated from the resin 7 filled in the inside of the cover 10 and the space C below the bottom 10c and the material of the case 2a. This provides double and triple insulation from the outside.

[0017]

[Effects of the Invention] As devised above, in the present invention, a box-shaped cover is integrally formed with the case inside the focus pack case with the bottom raised, and a high-voltage resistor is housed inside the cover, Place the resistor support base alongside the cover and also place it inside the case with the bottom raised,
Since the entire inside of the case, including the inside of the cover as well as the outside, is filled with insulating resin, it is possible to enhance the electrical insulation of the substrate housed inside the focus pack, especially to the outside of the high-voltage resistor, The electrical insulation of the entire focus pack can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a focus pack according to the present invention in a state where the inside can be seen.

FIG. 2 is a perspective view of the focus pack shown in FIG.
It is sectional drawing cut | disconnected by the line.

FIG. 3 is a perspective view showing a state where a conventional focus pack is assembled to a flyback transformer.

FIG. 4 shows a printed wiring pattern on a substrate incorporated in a conventional focus pack.

FIG. 5 is a cross-sectional view of the conventional focus pack shown in FIG. 4 taken along line BB of FIG. 4;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 flyback transformer 2 focus pack 2 a case 3, 4 voltage adjustment knob 10 cover 11 high-voltage resistor 12 variable resistor support 15 tin lead 20 ceramic substrate

Claims (1)

(57) [Scope of request for utility model registration] 1. A box-shaped cover for accommodating a high-voltage resistor is integrally formed with a case inside an insulating case so that a space is formed between the case and the bottom of the case. A support for supporting a variable resistor for focus voltage adjustment is arranged side by side with the cover so that a space is formed between the cover and a part of the high-voltage resistor and a part of the variable resistor. A focus pack structure characterized by connecting with lead wires and filling the inside of the case with insulating resin.