JP2001068221A - Mounting structure of shield wire to metal case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent noise from leaking to the outside and impart a waterproofing property by ensuring electrical connection of a conductive shield material of a shield wire to a metal case. SOLUTION: This structure has an elastic piece 22 pierced in contact by a shield wire 2, and a fastener 21 for fixing the elastic piece 22 to a metal case 19, the shield wire 2 is inserted into the metal case 19 through an insertion hole 29 of the metal case 19, projecting parts 90 for preventing intrusion of the elastic piece 22 into the metal case 19 are formed in the insertion hole 29, and the elastic piece 22, the metal case 19 and an insulation 105 of the shield wire 2 are abutted by fixing the fastener 21. In addition, grounding means 6, 7 for abutting and electrically connecting a conductive shield material 104 on/to the metal case 19 are formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for attaching a shielded wire to a metal case, and is used, for example, for connecting a high-frequency power cable of an electrodeless discharge lamp.

[0002]

2. Description of the Related Art Conventionally, when a shield wire is attached to a case, a packing 47 is arranged between an upper box 42 and a lower box 44 constituting a conductive cover 41 as shown in FIG. A shield wire 49 is inserted between them, and the shield wire 49 is brought into contact with and conductive inside the conductive cover 41, and the shield wire 49 is grounded. Also,
At the same time, the packing 47 and the shield wire 49 are brought into close contact with each other, thereby ensuring the waterproofness of the conductive cover 41 (see Japanese Patent Application Laid-Open No. 7-21395).

[0003]

However, according to the prior art, the electric wire insertion notches 43, 45 of the conductive cover 41 are not provided.
There is a drawback that the noise in the conductive cover 41 leaks outside through the packing 47 and the insulating portion of the outer skin of the shield wire 49 since the space between the shield wire 49 and the shield wire 49 is not electrically shielded. In addition, when the distance between the conductive cover 41 and the shield wire 49 is reduced to reduce the noise, the thickness of the packing 47 at the wire insertion notches 43 and 45 is reduced, and the waterproof property is reduced. .

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and to ensure the electrical connection between a conductive shielding material of a shielded wire and a metal case so as to prevent noise from leaking to the outside. It is an object of the present invention to provide a structure for attaching a shielded wire having a property to a metal case.

[0005]

In order to solve the above-mentioned problems, in the structure for attaching a shielded wire to a metal case according to the present invention, as shown in FIG.
Or a plurality of core wires 100, 102,
102 is covered with a first conductive shielding material 104, and the outside of the first conductive shielding material 104 is covered with a first insulator 10.
In the structure for attaching the shielded wire 2 covered by the shield wire 2 to the metal case 19, the elastic piece 22 through which the shielded wire 2 penetrates and contacts, and the elastic piece 22 are attached to the metal case 19. A first stopper 21 for fixing the shield wire 2 to the metal case 1
9 is inserted through the metal case 19 through the insertion hole 29, and the insertion hole 29 is provided with a convex portion 90 for preventing the elastic piece 22 from entering the metal case 19, and the first stopper 21 is fixed. The first insulator 1 of the elastic piece 22 and the metal case 19 and the shielded wire 2
And the ground means 6 and 7 for making the first conductive shield material 104 and the metal case 19 contact and conduct.
Is provided.

[0006]

(Embodiment 1) The configuration of Embodiment 1 of the present invention will be described in detail with reference to FIGS.
In the present embodiment, as shown in FIG. 1, a shield wire insertion hole 29 through which the shield wire 2 is inserted is provided in the metal case 19, and the shield wire 2 is connected to the metal case 19 from the vicinity of the outlet 5 inside the metal case 19. The elastic piece 22 and the metal piece 24 introduced into the inside 19 and penetrated through the shield wire 2 are inserted into the shield wire insertion hole 29. In this state, the elastic piece 22 is fixed to the metal case 19 by the stopper 21. The stopper 21 is provided with a screw portion 21 a, and the screw portion 21 a is inserted into the shield wire insertion hole 29 of the metal case 19. The elastic piece 22 is fixed in the metal case 19 via the metal piece 24 by screwing in from the outside. The metal piece 24 is provided to prevent the rotation of the stopper 21 from being transmitted to the elastic piece 22 by causing a slip between the metal piece 24 and the stopper 21.

In the shield wire insertion hole 29, a convex portion 90 for preventing the elastic piece 22 from entering the inside of the metal case 19 is provided near the outlet portion 5. Further, the conductive shield material 104 and the insulator 105 of the shield wire 2
A conductive tape 51 is applied so as to cover the conductive shield material 104 and the conductive shield material 104 and the outlet 5 inside the metal case 19 so as to be electrically connected to both. In this state, the conductive shield material 104 and the conductive tape 51 of the shield wire 2 introduced into the metal case 19 are pressed against the metal case 19 by the fasteners 6 and the screws 7 as shown in detail in FIG. Grounded.

As described above, by introducing the conductive shield material 104 of the shield wire 2 into the metal case 19, grounding can be reliably performed at a place visible to an operator, and the conductive tape 51 is provided. In the vicinity of the outlet 5 of the metal case 19, the gap through which the electromagnetic wave can pass between the metal case 19 and the conductive shielding material 104 is reduced, and the shielding effect between the inside and the outside of the metal case 19 is improved. Further, when the elastic piece 22 is pressed and deformed, the inner and outer side surfaces of the elastic piece 22 come into contact with the insulator 105 of the shielded wire 2 and the metal case 19 to maintain airtightness. The inner side has a waterproof structure against the outer side. In particular, by introducing the shielded wire 2 into the metal case 19 so as to include the inner conductor 100 to the insulator 105, the metal case 19
The protrusion 90 prevents the shield wire 2 from coming off even when a tensile force is applied to the shield wire 2 from the outside, and further prevents the elastic piece 22 from entering the inside of the metal case 19 in the shield wire insertion hole 29. Is provided near the outlet 5 so that the shield wire insertion hole 29
There is an effect that the gap between the metal case 19 and the shield wire 2 is reduced, and the shielding property and airtightness between the inside and the outside of the metal case 19 are improved.

The conductive tape 51 has a mesh shape.
Any conductor having flexibility such as a foil shape or a rubber shape may be used, and the same effect can be obtained. Also, as shown in FIG.
In order to increase the contact area between the conductive tape 51 and the metal case 19, the metal case 19 may be provided with a concave portion 3 having a semicircular contact section, so that grounding can be performed more reliably.

Further, the elastic piece 2 used in the first embodiment
2 is made of silicone rubber, and the shielded wire 2 is shown in FIG.
As shown in the figure, an inner conductor 100 as a core wire is coated with an insulator 101, an outer conductor 102, an insulator 103, a conductive shield material 104, and an insulator 105 toward the outside in the radial direction. Further, as shown in FIG. 5, the shield wire 2 may be a shield multi-core wire composed of a core wire 106, an insulator 107, and a conductive shield material 108, and the insulator outside the shield wire 2 is made of vinyl chloride, polyethylene, or the like. It is configured. In addition, conductive shielding material 1
Regarding the structure of Nos. 04 and 108, a similar effect can be obtained by using any of a horizontal winding, a braided wire, a metal foil structure and the like.

The present invention is used, for example, in the electrodeless discharge lamp lighting device shown in FIG. The electrodeless discharge lamp lighting device
Commercial power supply 30, 2-core shielded wire 25, metal case 34,
Coaxial line 2, metal case 37, high frequency power supply coil 3
8. It is composed of an electrodeless discharge lamp 39. In one metal case 34, a diode bridge 31, a chopper power supply circuit 32, and a high frequency generation circuit 33 are housed, and in the other metal case 37, a matching circuit 36 is housed. Here, the metal case 34, the two-core shielded wire 25, and the coaxial wire 2
Have the same potential, and the metal case 37 and the conductive shield material of the coaxial line 2 have the same potential.

When the coaxial cable 2 is mounted on the metal cases 34 and 37, the above-described mounting structure is used.
An electrodeless discharge lamp having a low-noise and waterproof structure that can suppress unnecessary high-frequency radiated noise generated from the metal case 37, the coaxial line 2, and the like of the electrodeless discharge lamp lighting device operating at a high frequency of several hundred kHz or more. A lighting device can be configured. Also,
The present invention is not limited to the electrodeless discharge lamp lighting device, and can be used anywhere where an electric circuit or the like provided in a metal case is electrically connected.

(Embodiment 2) FIG. 7 shows the configuration of Embodiment 2. A description of the same configuration and effects as those of the first embodiment will be omitted. The difference from the first embodiment is that the conductive shield material 104 of the shield wire 2 is replaced with the metal case 1 of the shield wire 2.
9, is inserted between the metal case 19 and the elastic piece 22 inside the shield wire insertion hole 29, and the elastic piece 22 is fixed to the metal case 19 by the stopper 21. The conductive shielding material 104 is grounded to the metal case 19, and a conductive adhesive 50 such as silicone is applied to the vicinity of the outlet 5 of the metal case 19, so that the metal case 19 and the conductive shielding material 104 Is reduced, and the conductive adhesive 50 has the effect of improving the airtightness between the inside and the outside of the metal case 19. Note that, similarly to Embodiment 1, the conductive tape 51 is
04, and the shielding property can be further improved.

(Embodiment 3) FIG. 8 shows the configuration of Embodiment 3. A description of the same configuration and effects as those of the first embodiment will be omitted. The difference from the first embodiment is that the stopper 52 (shown in detail in FIG. 9) for fixing the conductive shield material 104 of the shield wire 2 is fixed to the metal case 19 with the screw 7 so that the conductive shield material 104 is fixed. Is pressed against the metal case 19, and the spring 53 of the stopper 52 is brought into contact with the vicinity of the outlet 5 of the metal case 19, thereby improving the shielding properties between the inside and the outside of the metal case 19. And the function of both is
Since the configuration is also used, there is an effect that the configuration is simplified and the cost can be reduced. Note that the conductive tape 51 may be added similarly to the first embodiment, and the shielding property can be further improved.

(Fourth Embodiment) FIG. 10 shows the configuration of a fourth embodiment. A description of the same configuration and effects as those of the first embodiment will be omitted. The difference from the first embodiment is that a cylindrical metal body 54 shown in detail in FIG. 11 is provided. While the inside of the conductive wire 104 of the shield wire 2 is penetrated by the metal body 54, the insulator 105 is prevented from penetrating by the convex portion 57 protruding inward, and the shield wire 2 and the metal body 54 are outside the metal case 19. The protruding portion 56 protruding outward is inserted into the shield wire insertion hole 29 more.
The metal body 54 is securely electrically connected to the metal case 19 by contacting the metal case 19 inside the metal case 19 and fixing the elastic piece 22 to the metal case 19 by the stopper 21.
In addition, the convex portion 57 protruding inward is connected to the conductive shielding material 10.
4 may be electrically contacted with the metal case 19.
The shielding property between the inside and the outside of the box is improved.

[0016]

According to the present invention, the shield wire is inserted into the metal case through the insertion hole of the metal case, and the projection is provided in the insertion hole to prevent the elastic piece from intruding into the metal case. And the shield wire can be prevented from coming off, and the shielding and airtightness between the inside and outside of the metal case are improved. Further, by disposing a conductive piece in the vicinity of an exit portion inside the metal case of the insertion hole so as to be electrically connected to at least one of the first conductive shield material or the metal case, This has the effect of reducing the gap through which electromagnetic waves can pass between them, and improving the shielding properties between the inside and outside of the metal case.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of Embodiment 1 of the present invention.

FIG. 2 is a sectional view of a main part showing an example of a grounding means according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view of a main part showing another example of the grounding means according to the first embodiment of the present invention.

FIG. 4 is a side view showing an example of an internal configuration of the shielded wire according to the first embodiment of the present invention.

FIG. 5 is a side view showing another example of the internal configuration of the shielded wire according to the first embodiment of the present invention.

FIG. 6 is a circuit diagram showing an example in which the first embodiment of the present invention is used for an electrodeless discharge lamp lighting device.

FIG. 7 is a cross-sectional view of Embodiment 2 of the present invention.

FIG. 8 is a sectional view of Embodiment 3 of the present invention.

FIG. 9 is a perspective view of a stopper used in Embodiment 3 of the present invention.

FIG. 10 is a sectional view of Embodiment 4 of the present invention.

FIG. 11 is a perspective view of a metal body used in Embodiment 4 of the present invention.

FIG. 12 is a sectional view of a conventional example.

[Description of Signs] 2 Shield wire 6 Stopper 7 Screw 19 Metal case 22 Elastic piece 29 Insertion hole 90 Convex part 100 Core wire 102 Core wire 104 Conductive shield material 105 Insulator

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuji Kumagai 1048 Odakadoma, Kadoma-shi, Osaka Matsushita Electric Works, Ltd. 5E021 FA03 FB10 FB11 FB21 FC21 FC40 GB02 LA01 LA10 LA14 LA19 5E321 AA03 AA14 BB44 CC16 CC22 GG09 GH07

Claims (14)

[Claims] 1. A conductor having one or a plurality of insulated core wires, wherein the core wires are covered with a first conductive shield material, and the outside of the first conductive shield material is a first insulator. A structure for attaching a shielded wire to a metal case, wherein the shielded wire penetrates and contacts, and a first stopper for fixing the elastic piece to the metal case. Wherein the shield wire is inserted into the metal case through an insertion hole of the metal case, and the insertion hole is provided with a convex portion for preventing the elastic piece from entering the metal case, and a first stopper is provided. A grounding means for contacting the first conductive shield material and the metal case by providing contact between the elastic piece and the first insulator of the metal case and the shield wire by fixing the tool; It is characterized by Mounting structure to the shield line of the metal case that. 2. The mounting of a shield wire to a metal case according to claim 1, wherein said ground means inserts said first conductive shield material between said elastic piece and said metal case. Construction. 3. A conductive piece is provided in the vicinity of the metal case inner outlet of the insertion hole so as to be in contact with at least one of the first conductive shield material and the metal case. Item 3. A structure for attaching a shielded wire to a metal case according to Item 1 or 2. 4. The structure according to claim 3, wherein the conductive piece is interposed between the first insulator and a convex portion of the insertion hole. 5. The shielded wire according to claim 3, wherein the conductive piece is brought into contact with both the first conductive shield material and the metal case. Mounting structure. 6. The structure according to claim 3, wherein the conductive piece also serves as the grounding means. 7. The sheet according to claim 3, wherein the conductive piece is a sheet-shaped flexible conductor such as a conductive tape or a conductive foil disposed to cover the shield wire.
6. A structure for mounting the shielded wire according to any one of claims 5 to 5 to a metal case. 8. The structure according to claim 3, wherein the conductive piece is a substantially cylindrical conductor penetrated by the shield wire. . 9. The structure according to claim 3, wherein the conductive piece is a conductive adhesive such as a silicone-based adhesive. 10. The shield wire is covered with a second conductive shield material and a second insulator between the core wire and the first conductive shield material from the center to the outside. The structure for attaching a shielded wire to a metal case according to any one of claims 1 to 9, comprising a coaxial wire. 11. A substantially U-shaped recess having a substantially same width as an outer diameter of the first conductive shield material is provided in the metal case in the vicinity of the metal case inside outlet of the insertion hole,
2. The structure according to claim 1, wherein the first conductive shield material is accommodated in the recess and fixed with a conductive stopper. 12. The grounding means is a substantially T-shaped metal member. A central piece of the metal member is brought into elastic contact with an inner wall of a metal case, and a pair of side pieces extending from the central piece to both sides are formed. 2. The structure for attaching a shielded wire to a metal case according to claim 1, wherein the first conductive shield material is interposed between the metal member and the metal case. 13. The shielded wire metal according to claim 8, wherein the substantially cylindrical conductor has an outer flange at one end opening outside the metal case and an inner flange at the other end opening. Mounting structure to the case. 14. A conductor having one or a plurality of insulated core wires, wherein the core wires are covered with a first conductive shield material, and the outside of the first conductive shield material is a first insulator. A structure for attaching a shielded wire to a metal case, wherein the shielded wire penetrates and contacts, and a first stopper for fixing the elastic piece to the metal case. Wherein the shield wire is inserted into the metal case through an insertion hole of the metal case, and the insertion hole is provided with a convex portion for preventing the elastic piece from entering the metal case, and a first stopper is provided. Grounding means for contacting the elastic piece and the first insulator of the metal case and the shield wire by fixing the tool, and providing contact and conduction between the first conductive shield material and the metal case; at least A conductive piece is provided in the vicinity of the metal case inner outlet of the insertion hole so as to be in contact with and conductive to one of the first conductive shield material and the metal case. A shield wire is attached to a metal case, wherein the shield wire is interposed between the projection and the insertion hole.