JP2925233B2 - High-voltage variable resistor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-voltage variable resistor used for a voltage adjustment of a focus circuit of a CRT or a screen circuit, and the like.

[Prior Art] Conventionally, an insulating substrate having a variable resistance circuit pattern formed on its surface is arranged in an insulating resin case having an opening at one end, and the insulating resin is filled and cured in a space on the back side of the substrate of the case. In such a high-voltage variable resistor, a lead wire is connected to a terminal provided on the back side of the substrate by soldering. However, the connection of the lead wires by soldering has a problem that the connection work is troublesome, and when the distance between the terminals is short, discharge is easily generated between the terminals.

Therefore, as shown in FIG. 4, pin terminals 3 penetrating the insulating substrate 2 disposed in the insulating resin case 1 in the thickness direction.
Is attached to the substrate 2, and one end of each of the pin terminals 3 is electrically connected to an electrode portion formed on the surface of the substrate 2. A high-voltage variable resistor in which the member 4 is inserted has been proposed. The pin terminal guide member 4 forms a cylindrical space 5 around the pin terminal 3 and forms a male connector 6 in combination with the pin terminal 3. The female connector 8 is fitted to the male connector 6. The female connector 8 includes a contact 10 which is connected to the core wire of the lead wire 9 and comes into contact with the pin terminal 3.

[Problems to be Solved by the Invention] As in the conventional example of FIG. 4, a male connector 6 is formed by combining a pin terminal 3 and a pin terminal guide member 4, and a lead wire 9 is connected to the terminal. By doing so, the work of connecting the lead wires 9 becomes easy, and the insulation between the terminals can be greatly improved. However, conventionally, each pin terminal 3
Then, the pin terminal guide members 4 are individually inserted and positioned, and then the insulating resin is filled in the opening of the case 1 to form the insulating resin layer 7. Therefore, the work of attaching and positioning the pin terminal guide member 4 to the pin terminal 3 is troublesome. When a large force is applied to the pin terminal guide member 4 when the female connector 8 is pulled out from the male connector 6, the pin terminal guide member 4 may come off from the insulating resin layer 7. Further, even if the pin terminal guide member 4 does not come off, a force is partially applied to the insulating resin layer 7 to form a gap between the insulating resin layer 7 and the substrate 2, resulting in a problem that the insulating performance is reduced. .

SUMMARY OF THE INVENTION It is an object of the present invention to provide a high-voltage variable resistor that can easily mount and position a pin terminal guide member and can greatly increase the mounting strength of the pin terminal guide member.

Another object of the present invention is to provide a high-voltage variable resistor to which a pin terminal guide member can be attached without lowering the insulating performance of the insulating resin layer.

It is still another object of the present invention to provide a high-voltage variable resistor that can significantly increase the mounting strength of a female connector.

[Means for Solving the Problems] As can be seen from the embodiment shown in the drawings, in the high-voltage variable resistor to be improved by the present invention, the surface of the variable resistor for the high voltage is changed in the insulating resin case 11 having an open end. An insulating substrate 12 on which a resistance circuit pattern is formed is disposed, and the insulating substrate is electrically connected to electrode portions formed on a front surface 12a of the substrate, and a plurality of the insulating substrates protrude toward the back surface 12b through the substrate. Are provided. Each of the plurality of pin terminals 13 projecting to the rear surface of the substrate is provided with an insulative pin terminal guide member 14a to 14f that forms a cylindrical space 15 around the pin terminal. The space on the back side of the substrate 12 of the case 11 is filled with an insulating resin and cured to form an insulating resin layer 17.
Are formed.

In the present invention, the plurality of pin terminal guide members 14 a to 14 f are integrally connected by the insulating connecting body 30, and at least a part of the connecting body 30 is embedded in the insulating resin layer 17. And connecting body 30
A resin inflow path around which the insulating resin flows is formed between the substrate and the back surface 12b of the substrate. Further, a resin inflow path through which the insulating resin flows is formed at an end of the pin terminal guide members 14a to 14f which contacts the back surface 12b of the substrate.

When the plurality of pin terminal guide members 14a to 14f are connected by the insulating connecting body 30, the plurality of pin terminal guide members can be attached to the plurality of pin terminals by one insertion operation. . If the pin terminals 13 are connected by the connecting body 30, all the pin terminal guide members can be positioned only by positioning one pin terminal guide member. Furthermore, since the connecting body is also embedded in the insulating resin layer 17, the mounting strength of the pin terminal guide member is greatly increased. Also, connect the connector with an insulating resin layer
Even when buried in 17, if a resin inflow path through which the insulating resin flows around between the connector 30 and the back surface 12b of the substrate as in the present invention, between the connector 30 and the back surface 12b of the substrate It is possible to prevent the formation of a void that lowers the insulating property of the insulating resin layer 17. Furthermore, if a resin inflow path through which the insulating resin flows is formed at the end of the pin terminal guide members 14a to 14f which abuts on the back surface 12b of the substrate, the insulating resin is provided between the end surface of the pin terminal guide member and the back surface of the substrate. It is possible to prevent the formation of a void that lowers the insulation of the layer.

Further, in the present invention, the periphery of the base of the pin terminals 13 may be covered with an insulating resin constituting the insulating resin layer 17. In this way, the mounting strength of the pin terminals 13 can be increased.

Further, in the present invention, the connector 30 is
2, 33 may be provided integrally. By doing so, the female connector unit 34 can be prevented from coming off.

Embodiment An embodiment of the present invention will be described below in detail with reference to the drawings.

1 (A) and 1 (B) are a front view and a side view showing the appearance of a high-voltage variable resistor according to an embodiment of the present invention. In this embodiment, three variable resistors are made of an insulating resin case. It is located inside 11. The case 11 is integrally provided with a capacitor housing portion 11a for housing a high-voltage capacitor. FIG. 2 shows the relationship between the structure of the terminal portion of the embodiment of FIG. 1 and the female connector unit 34 connected to the terminal portion. On the inner wall surface of the insulating resin case 11 having an open end, a substrate mounting step 11b for mounting the ceramic insulating substrate 12 is formed. If it is necessary to prevent the resin from flowing around the surface of the substrate 12,
It is preferable that the surface 12a and the step 11b are joined with an adhesive.

On the surface 12a of the substrate 12, a variable resistor circuit pattern (including a variable resistor, a fixed resistor, and a jumper wire portion) and a plurality of solderable electrode portions provided at appropriate portions of the variable resistor circuit pattern are provided. Are formed. Although not shown, through holes for terminal insertion are formed in the substrate 12 at positions corresponding to the respective electrode portions. In these through holes,
One end of the pin terminal 13 is inserted, and the surface 12a of the substrate 12 is
The protruding end is electrically connected to the electrode portion by solder. The pin terminals 13 have flanges 13a for retaining them.
Is provided.

A cylindrical pin terminal guide member inserted into the pin terminals 13 ...
14a to 14f are integrally connected by a connector 30.
A pin guide molded body 31 is constituted by the pin terminal guide members 14a to 14f and the connecting body 30, and the pin guide molded body 31 of the present embodiment is made of engineering such as polyphenol oxide (PPO) or polybutyl terephthalate (PBT). -It is integrally molded using plastics. 3 (A) and 3 (B) show a plan view and a bottom view of the pin guide molded body 31, and FIG. 3 (C) shows C of FIG. 3 (A).
FIG. 4 shows a cross-sectional view taken along line C. In FIG. 3 (A), for easy understanding of the shape of the end face, the end face of a portion protruding in a direction perpendicular to the paper surface is hatched.

The pin terminal guide members 14a to 14f are divided into two groups depending on the shape of the end contacting the back surface 12b of the substrate 12. The first group of guide members are pin terminal guide members 14a and 14d, and the pin terminal guide members 14a
Will be described as an example. Pin terminal guide member 14
“a” includes a cylindrical portion 14a1 forming a cylindrical space 15 around the pin terminal 13, and a bottom plate portion 14a3 formed with a through hole 14a2 through which the pin terminal 13 penetrates. As shown in FIG. 3 (A), the through-hole 14a2 has a large-diameter portion 14a21 into which the flange portion 13a of the pin terminal 13 is loosely fitted, and the bottom plate portion 14a3 has the large-diameter portion 14a21. A pair of communicating grooves 14a4 and 14a5 is formed. Grooves 14a4 and 14a5 and large diameter portion 14a2 of through hole 14a2
1 forms a resin inflow path. One of these grooves 14a4 and 14a5 is used as lead wire holding means when fixing the lead wire of the high voltage capacitor to the pin terminal 13. The lead wire is fixed by soldering or winding around the pin terminal 13, but when the insulating resin forming the insulating resin layer 17 is hardened, an excessive force is applied to the lead wire and the lead wire and the pin terminal Connection failure with 13 may occur. Therefore, by arranging the connection end of the lead wire in the groove 14a4 or 14a5, an excessive force is prevented from being applied to the connection end of the lead wire.

The second group of guide members is a pin terminal guide member.
14b, 14c, 14e, and 14f. The structure of the pin terminal guide member 14e will be described as an example. Pin terminal guide member 14e
Is a cylindrical portion forming a cylindrical space 15 around the pin terminal 13
A bottom plate portion 14e3 having a through hole 14e2 through which the pin terminal 13 passes and a pair of wall portions 14e4 and 14 protruding from the bottom plate portion.
e5. A bottom plate portion 14e3 and a pair of wall portions 14e4 and
A resin inflow path is formed by the space surrounded by 14e5. Of course, all the pin terminal guide members may have the same structure as the pin terminal guide member 14e.

The connecting body 30 is composed of five unit connecting bodies 30a to 30e, and each unit connecting body includes plate-shaped portions 30a1 to 30e1 arranged such that one plate surface faces the back surface 12b of the substrate 12, and Rib 30a2 protruding from the surface of the substrate 12 facing the back surface 12b
~ 30e2 and a pair of ribs protruding from both edges of the opposite surface
30a3 to 30e3 [FIG. 3 (B)]. These ribs reinforce the mechanical strength of the plate-like portion, and ribs 30a2 to 30e2 located on the back surface 12b side of the substrate 12 are provided between the end surface of the rib and the back surface 12b of the substrate 12 by an insulating resin. The height is determined so as to form a resin inflow path into which the fluid flows.
Note that the resin inflow path is formed by the plate-shaped portions 30a1 to 30e1 and the back surface 12b of the substrate.
Is also formed between them. The insulating resin forming the insulating resin layer 17 enters the space surrounded by the pair of ribs 30a3 to 30e3, and has a function of preventing the unit connector from moving.

Female connectors / unitters are used for unit connectors 30b and 30d.
Locking pieces 32 and 33 for connector connection locked by locking pieces provided on 34 are integrally fixed. The male connector 16a is formed by the pin terminals 13 and the pin terminal guide members 14a to 14f.
To 16f.

Male connectors to which lead wires are fixed are fitted to these male connectors 16a to 16f. In the female connector unit 34 shown in FIG. 2, female connectors (18a to 18e) to be mated with other male connectors except the male connector 16d.
Are connected integrally by a connector 35. The connector 35 has a locking piece 36 that engages with the connector connecting locking pieces 32 and 33.
(The locking pieces locked by the locking pieces 33 are not shown). The shape of these locking pieces is arbitrary, and may be any shape as long as the engagement is not easily released. In FIG. 2, reference numeral 19 denotes a lead wire, and reference numeral 20 denotes a contact. Note that a single female connector with a lead wire drawn out in a direction parallel to the board 12 is fitted to the male connector 16d. In the case where the lead-out direction of the lead wire is different from the lead-out direction of the other lead wires, it is not necessary to integrally provide all the female connectors in one female connector unit as in this embodiment.

In the above embodiment, since the pin terminals 13 and the cylindrical portions (14a1 and 14e1) of the respective pin terminal guide members are configured to be non-concentric, the female connector of the female connector unit is erroneously inserted. Never mated with a male connector. This configuration is particularly effective when the pin terminals are symmetrically arranged.

In the above embodiment, the connecting body 30 is completely formed of an insulating resin layer.
Although the connector 30 is embedded in the insulating resin layer 17, it is not necessary to completely embed the connector 30 in practicing the present invention.

In the above embodiment, since the through-hole penetrating the pin terminal 13 is formed in each pin terminal guide member, it is not particularly necessary to position the pin terminal guide member.

[Effects of the Invention] According to the present invention, since a plurality of pin terminal guide members are integrally connected by an insulating connecting body, a plurality of pin terminal guides are provided for a plurality of pin terminals by one insertion operation. There is an advantage that members can be attached. Further, since at least a part of the connecting body is embedded in the insulating resin layer, the mounting strength of the pin terminal guide member can be greatly increased. Also, if a resin inflow path around which the insulating resin flows around between the connector and the back surface of the board,
It is possible to prevent the formation of a gap between the connector and the back surface of the substrate that reduces the insulating property of the insulating resin layer. Further, by forming a resin inflow path through which the insulating resin flows around the end of the pin terminal guide member that contacts the back surface of the substrate, the insulating resin layer is provided between the end surface of the pin terminal guide member and the back surface of the substrate. Can be prevented from being formed.

Further, if the periphery of the base of the pin terminal is covered with an insulating resin constituting the insulating resin layer, the mounting strength and the insulating strength of the pin terminal can be increased.

Further, if the connector is provided integrally with the connector connection locking piece, there is an advantage that the female connector unit can be prevented from coming off.

[Brief description of the drawings]

FIGS. 1A and 1B are an external front view and a side view of a high-voltage variable resistor according to an embodiment of the present invention. FIG. 2 is a diagram showing the relationship between the structure of the terminal portion of the embodiment of FIG. 1 and the female connector unit connected to the terminal portion. 3 (A) and 3 (B) are a plan view and a bottom view of the pin guide molded body, and FIG. 3 (C) is a sectional view taken along line CC of FIG. 3 (A). FIG. 4 is a partially cutaway sectional view showing the configuration of a conventional high-voltage variable resistor. 1,11 …… Insulating resin case, 2,12 …… Insulating substrate, 3,13
…… Pin terminal, 4,14a-14f …… Pin terminal guide member, 5,
15… Cylindrical space, 6,16a ～ 16f …… Male connector, 7,17
... insulating resin layer, 8, 18 ... female connector, 9, 19 ... lead wire, 30 ... connector, 32, 33 ... locking piece for connector connection.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H01C 1 / 02,1 / 14 H01C 10 / 32,13 / 00

Claims (1)

(57) [Claims] An insulating substrate having a variable resistance circuit pattern formed on a surface thereof is disposed in an insulating resin case having an opening at one end, and the insulating substrate has an electrode portion formed on a surface of the substrate. A plurality of pin terminals that are electrically connected and penetrate the substrate and protrude to the back side; and the plurality of pin terminals protruding to the back side of the substrate include:
An insulating pin terminal guide member that forms a cylindrical space around each of the pin terminals is inserted, and an insulating resin is filled and cured in a space on the back surface side of the substrate of the insulating resin case to form an insulating resin layer. In the high-voltage variable resistor formed, the plurality of pin terminal guide members are connected by a connecting body having an insulating property, and at least a part of the connecting body is embedded in the insulating resin layer. A high-voltage variable resistor, wherein a connector connection locking piece is provided integrally.