WO2012077611A1

WO2012077611A1 - Ground fixture

Info

Publication number: WO2012077611A1
Application number: PCT/JP2011/077984
Authority: WO
Inventors: 卓史京山; 井上　泰彦; 石井　庸介
Original assignee: 株式会社ニフコ
Priority date: 2010-12-08
Filing date: 2011-12-02
Publication date: 2012-06-14
Also published as: JP2012124317A

Abstract

Provided is a ground fixture that is fixed to a substrate by a flange section and an elastic engagement leg, maintains conduction between the substrate and a chassis arranged facing same using an elastic conduction member, and comprises: a main body comprising the flange section, the elastic engagement leg, and a spacer section; and the elastic conduction member supported by the main body. The lower end section of the elastic conduction member extends to below the flange section and is grounded to the substrate. The upper end section of the elastic conduction member extends to above the spacer section and is grounded to the chassis. Therefore the allowable range for distance to the substrate can be increased to enable compatibility with a plurality of distances to the substrate.

Description

Grounding fixture

The present invention relates to a grounding fixture that can be used for grounding between a base mounted inside an electronic device such as a television and a chassis and can contribute to EMC (Electromagnetic Compatibility) countermeasures.
In electronic devices such as plasma televisions, liquid crystal televisions, PC monitors, and electric vehicles, high frequency noise countermeasures are indispensable as the circuit speed increases, and spacers that contribute to EMC countermeasures are desired.

For example, as shown in FIGS. 15 and 16, a conventional energizing spacer includes a spacer 2 having a non-conductive snap fixing portion 1 made of synthetic resin or the like at both ends, and a conductive and elastic connecting plate attached to the spacer 2. 3 and a toothed edge 4 which abuts elastically between the card and the card. The spacer 2 has

shoulder portions

2a and 2a formed at predetermined intervals, and the tooth profile edges 4 of the connection plate 3 are mounted on the shoulder portions 2a.
The current-carrying spacer having such a configuration is disposed between the base 5 and the chassis 6 as shown in FIG. 16, and holds and fixes the base 5 and the chassis 6 with the

shoulders

2a and 2a, and the tooth profile edge 4 comes into contact. Conduction and grounding (Patent Document 1).

特許 Also, Patent Document 2 discloses a spacer that holds and fixes the printed circuit board and the chassis and also conducts electricity.

JP 09-275284 A JP 2009-64906 A

However, the conventional spacers and the like disclosed in

Patent Documents

1 and 2 have a constant interval between the base and the chassis, can be used only for a predetermined application, and have poor versatility. That is, when there are a plurality of distances between the board and the chassis to be electrically connected, there is a drawback that a grounding fixture must be prepared for each product.

The present invention has been made to eliminate the above-described disadvantages, and includes a main body including a flange portion, an elastic engagement leg, and a spacer portion, and an elastic conductive member that is rotatably supported by the main body. The grounding arm extending downward of the elastic conducting member extends to the bottom of the flange and grounded to the base, and the grounding arm extended upward extends to the top of the spacer portion. Since it extends and is grounded to the chassis, it is possible to provide a grounding fixture that can increase the allowable range of the distance between the base and the chassis and can quickly cope with the distance between the plurality of plates.

According to the present invention, in the grounding fixture that is fixed to the base by the flange and the elastic engagement leg, and that maintains conduction between the chassis and the chassis that is opposed to the base by the elastic conductive member, the hook and the elastic engagement leg And an elastic conduction member supported by the main body, and a lower end portion of the elastic conduction member extends to the bottom of the flange and is grounded to the base. The upper end portion extends to above the spacer portion and is grounded to the chassis.
In the grounding fixture according to the present invention, the lower end portion of the elastic conductive member extends to the base as a grounding arm and is grounded to the base, and the upper end portion of the elastic conductive member serves as the grounding arm as the spacer. It should be extended to the top of the unit and grounded to the chassis. If it carries out like this, it will be excellent in the followability with respect to the fluctuation | variation of the distance between boards.
In the grounding fixture according to the present invention, the elastic conducting member may be a coil spring made of a wire, and a winding portion of the coil spring may be rotatably held by the spacer portion. If it carries out like this, it will be excellent in the followability with respect to the fluctuation | variation of the distance between boards.
In the grounding fixture according to the present invention, the coil spring includes a winding portion at the center, and grounding arms extend at both ends, and is held between the support shafts formed on the spacer portion at the winding portion. Good. If it carries out like this, it will be excellent in the followability with respect to the fluctuation | variation of the distance between boards.
In the grounding fixture according to the present invention, the coil spring has a first grounding arm formed at the center, and second grounding arms formed at both ends via the winding part, and is formed on both sides of the spacer part. It is preferable that the first grounding arm and the second grounding arm are rotatably supported by holding the winding portion with a shaft. If it carries out like this, while being able to aim at stable conduction | electrical_connection, it is excellent in the followability with respect to the fluctuation | variation of the distance between boards.
In the grounding fixture according to the present invention, the elastic conducting member is a coil spring detachably locked to a recess formed in the main body, and an upper end portion of the coil spring extends to above the spacer portion. It should be grounded to the chassis. If it carries out like this, when attaching a grounding fixing tool to a base | substrate, it can work easily by picking a cylindrical spacer part.

According to the present invention, in a grounding fixture for maintaining conduction between a chassis and a chassis disposed opposite to a base by an elastic conductive member, a main body including the flange portion, the elastic engagement leg, and the spacer portion, and a support on the main body. A lower end portion of the elastic conductive member that extends to the bottom of the flange and is grounded to the base, and an upper end portion of the elastic conductive member that extends to above the spacer portion. Since the chassis is grounded, electrical connection between the base and the chassis can be obtained with a wide tolerance.

FIG. 1 is an overall perspective view of a grounding fixture showing an embodiment of the present invention. FIG. 2 is a front view of the grounding fixture. FIG. 3 is a side view of the grounding fixture. FIG. 4 is an overall perspective view of an elastic conducting member used in the grounding fixture. FIG. 5 is an explanatory view showing a use state of the grounding fixture. FIG. 6 is an explanatory view showing a usage state of the grounding fixture. FIG. 7 is an overall perspective view showing a second embodiment of the grounding fixture of the present invention. FIG. 8 is a front view of the grounding fixture. FIG. 9 is a side view of the grounding fixture. FIG. 10 is an overall perspective view of an elastic conducting member used in the grounding fixture. FIG. 11 is an explanatory view showing a use state of the grounding fixture. FIG. 12 is an explanatory view showing a use state of the grounding fixture. FIG. 13 is an exploded perspective view showing a third embodiment of the grounding fixture of the present invention. FIG. 14 is an overall perspective view of the grounding fixture. FIG. 15 is an exploded perspective view showing an example of a conventional grounding fixture. FIG. 16 is an explanatory view showing a use state of the grounding fixture.

The grounding fixing tool of the present invention includes a main body including a flange portion, an elastic engagement leg, and a spacer portion, and an elastic conductive member rotatably supported on the main body, and extends downward from the elastic conductive member. The grounding arm extended to the bottom of the collar and grounded to the base, and the grounding arm extended to the top extends to the top of the spacer and grounded to the chassis. It is possible to accommodate a plurality of inter-plate distances by widening the allowable range of the inter-distance.

FIG. 1 is an overall perspective view of a grounding fixture showing an embodiment of the present invention, FIG. 2 is a front view of the grounding fixture of the present invention, and FIG. 3 is a side view of the grounding fixture of the present invention. Here, the grounding fixture 10 is fixed to the base by the flange part 11 and the elastic engagement leg 12, and holds electrical conduction between the chassis and the chassis disposed opposite to the base by the elastic conductive member 13, A main body 15 including the flange portion 11, the elastic engagement leg 12, and the spacer portion 14, and an elastic conductive member 13 rotatably supported on the main body 15, and extends downward from the elastic conductive member 13. The grounding arm 16 extends to the bottom of the flange 11 and is grounded to the base, and the grounding arm 17 that extends upward extends to the top of the spacer 14 and is grounded to the chassis. The

The collar part 11 is located between the elastic engagement leg 12 and the spacer part 14, and is formed in a concave shape toward the lower surface. Moreover, the collar part 11 is extended in the left-right direction of the support | pillar 18 of the elastic engagement leg 12, as shown to FIG. Furthermore, the collar part 11 has a concave groove 19 in which the grounding arm 16 is locked.

The heel elastic engagement leg 12 includes a column 18 and a bulging portion 20, and the bulging portion 20 is integrally formed in the vicinity of the lower end of the column 18. Further, the bulging portion 20 is formed to be elastically deformable in the approaching or separating direction with respect to the support column 18. Further, an engagement step 20a is provided near the upper end of the bulging portion 20, and the base is held and fixed by the engagement step 20a and the flange 11 when inserted into the mounting hole of the base.

The eaves spacer portion 14 includes

wall body portions

21 and 22 that are arranged to face each other at a predetermined interval, and has a support shaft 23 that supports a spring winding portion on the opposite surface. The wall portion 22 is formed with a locking recess 24 for locking the grounding arm 17.

FIG. 4 is an overall perspective view of an elastic conducting member (torsion spring) used in the grounding fixture of the present invention. The elastic conducting member 13 is a torsion spring made of a wire, and includes a coiled winding portion 25 at the center, and grounding

arms

16 and 17 are formed to extend at both ends. The inner diameter of the winding part 25 is engageable with a support shaft 23 formed on the

wall parts

21 and 22 of the spacer part 14. Further,

bent portions

16a and 17a are formed in the vicinity of the end portions of the grounding

arms

16 and 17, and when attached to the spacer portion 14, as shown in FIGS. The end portion is formed so as to face perpendicularly to the base or the chassis. As the material of the elastic conductive member 13, a material obtained by sooting phosphor bronze can be used. Moreover, SUS material and SK material can also be used.

The main body 15 and the elastic conducting member 13 configured as described above are assembled as shown in FIGS. That is, the elastic conducting member (coil spring) 13 is held between the

support shafts

23 and 23 formed on the

wall bodies

21 and 22 of the spacer portion 14 by the winding portion 25, and the grounding arm 17 is attached to the wall body. The end portion faces directly above by being locked by a locking recess 24 formed in the portion 22, and the grounding arm 16 is locked by a concave groove 19 formed in the flange portion 11 and the end portion faces directly below. Further, the deformation of the grounding arm 17 locked by the locking recess 24 in the direction in which the coil spring is expanded is limited, but the deformation in the direction in which the coil spring is urged (the direction in which the grounding arm 17 is lowered). Is possible.
Further, the grounding arm 16 is locked by the concave groove 19 to restrict the deformation in the direction in which the coil spring is deployed, but the deformation in the direction in which the coil spring is urged (the direction in which the grounding arm 16 rises) is limited. Is possible.

接地 The grounding fixture 10 configured as described above inserts the elastic engagement legs 12 into the engagement holes 27 formed in the base 26 as shown in FIGS. Then, after the bulging portion 20 has once retracted due to its own elasticity according to the hole diameter of the engagement hole 27, the bulging portion 20 expands again at the engagement step portion 20 a in an attempt to expand its diameter to the original state by elasticity. The part 20 is engaged by being pressed against the rear side edge of the base 26. At this time, the flange portion 11 that is concavely curved toward the lower surface and the lower end (grounding arm) 16 of the elastic conducting member are also elastically deformed by contacting the upper surface of the base, so that the flange portion 11 and the engaging step portion The base 26 is sandwiched between 20a and the entire grounding fixture is fixed.

Further, the chassis 28 made of galvanized steel plate or the like is arranged in parallel to the base 26, and as shown in FIG. 8, the grounding arm 16 can be elastically deformed freely regardless of whether the distance is A or B. , 17 can ensure reliable conduction.
Further, since the grounding

arms

16 and 17 are locked by the concave groove 19 and the locking recess 24, respectively, they do not extend more than necessary.

Next, a second embodiment of the present invention will be described. 7 is an overall perspective view showing a second embodiment of the grounding fixture of the present invention, FIG. 8 is a front view of the grounding fixture of the present invention, and FIG. 9 is a side view of the grounding fixture of the present invention. . In the present embodiment, the grounding fixture 30 is fixed to the base 26 by the flange portion 31 and the elastic engagement legs 32, and conducts between the chassis 28 disposed opposite to the base 26 by the elastic conductive member 33. The elastic conductive member 33 is provided with a main body 35 including a flange 31, elastic engagement legs 32, and a spacer portion 34, and an elastic conductive member 33 rotatably supported on the main body 35. The second grounding arm 38 extending downward is extended to the bottom of the flange 31 and grounded to the base 26, and the first grounding arm 37 extending upward is the It extends over the spacer portion 34 and is grounded to the chassis 28.

The collar part 31 is located between the elastic engagement leg 32 and the spacer part 34, and is formed in a concave shape toward the lower surface. Moreover, the collar part 31 is extended in the left-right direction of the support | pillar 18 of the elastic engagement leg 32, as shown in FIG.

The heel elastic engagement leg 32 includes a support post 39 and a bulging portion 40, and the bulging portion 40 is integrally formed in the vicinity of the lower end of the support post 39. Further, the bulging portion 40 is formed to be elastically deformable in the approach or separation direction with respect to the support column 39. Furthermore, an engaging step 40a is provided near the upper end of the bulging portion 40, and the base is held and fixed by the engaging step 40a and the flange 31 when inserted into the mounting hole of the base.

FIG. 10 is an overall perspective view of the elastic conductive member 33 used in the grounding fixture 30 of the present invention. Here, the elastic conducting member 33 is a torsion spring, and a first grounding arm 37 is formed at the center, and

second grounding arms

38 and 38 are formed at both ends via the winding

portions

41 and 41. The elastic conducting member 33 is composed of a single wire, and the first grounding arm 37 is formed by bending the wire into a substantially U shape. The winding portion 41 is formed on both sides of the first grounding arm 37 and has an inner diameter that can be inserted into support shafts formed on both sides of the spacer portion 34. Further, the second grounding arm 38 has a bent portion 38a formed in the vicinity of the end portion, and when attached to the spacer portion 34, the second grounding arm 38 as shown in FIGS. Are formed so that their end portions face the base 26 perpendicularly.

The spacer portion 34 is erected vertically on the support column 39 and the flange portion 31, and has a central wall body portion 42, first locking pieces 43 formed on both sides of the lower end, and the central wall body portion 42 thereon. The support shafts 44 are formed on both sides, and the second locking pieces 45 are formed on both sides of the central wall portion 42 on the support shafts 44. The first locking piece 43 is formed with an engaging recess 46 for engaging the second grounding arm 38.
As shown in FIGS. 7, 8, and 9, the first grounding arm 37 is attached to the spacer portion 34 configured in this way so as to straddle the central wall body portion 42, and the winding portion 41 is attached to the left and right sides. The second grounding arm 38 is locked to the engaging recess 46 of the first locking piece 43 by being rotatably attached to the support shaft 44.

接地 The grounding fixture 30 configured in this way inserts the elastic engagement legs 32 into the engagement holes 27 formed in the base 26 as shown in FIGS. Then, after the bulging portion 40 has once retracted due to its own elasticity according to the hole diameter of the engagement hole 27, the bulging portion 40 expands again at the engagement step portion 40 a in an attempt to expand its diameter to the original state by elasticity. The portion 40 is engaged by being pressed against the rear side edge of the base 26. At this time, the flange portion 31 and the second grounding arm 38 that are formed in a concave shape toward the lower surface are also elastically deformed by coming into contact with the upper surface of the base, so that the space between the flange portion 31 and the engagement step portion 40a is reduced. In this way, the base 26 is pinched and the entire grounding fixture is fixed.

Further, the chassis 28 is arranged in parallel to the base 26, and as shown in FIG. 11, the chassis 28 can be freely rotated and deformed around the winding portion 41 regardless of whether the distance is A or B. A reliable conduction can be obtained by one grounding arm 37. Further, since the first grounding arm 37 is restricted from turning upward by the second locking piece 45, there is no possibility that the first grounding arm 37 will unfold more than necessary.

FIG. 13 is an exploded perspective view showing a third embodiment of the grounding fixture of the present invention, and FIG. 14 is an overall perspective view of the grounding fixture of the present invention. In the present embodiment, the grounding fixture 50 is fixed to the base 26 by the flange 51 and the elastic engagement legs 52, and is electrically connected to the chassis 28 arranged to face the base 26 by the elastic conductive member 53. A compression coil spring comprising a main body 55 comprising a flange 51, elastic engagement legs 52, and a spacer portion 54, and an elastic conducting member 53 supported by the main body 55 (spacer portion 54). A lower end portion 56 of the elastic conducting member 53 extends below the flange portion 51 and is grounded to the base 26, and an upper end portion 53a of the coil spring extends above the spacer portion 54 and is grounded to the chassis 28. .

Since the structure of the collar part 51 and the elastic engagement leg 52 is the same as that of 1st, 2nd embodiment, description is abbreviate | omitted. The spacer portion 54 is formed in a cylindrical shape on the flange portion 51, and has a concave portion 54a that can accommodate a coil spring winding portion 53b. Further, an L-shaped notch 57 for guiding the lower end portion 56 of the coil spring from the recessed portion 54 a to below the flange portion 51 is formed on the side surface of the spacer portion 54.

The elastic conductive member 53 is a compression coil spring, and the upper end portion 53a protruding from the spacer portion 54 can maintain electrical connection between the base 26 and the chassis 28 arranged opposite to the upper portion 53a. In addition, the lower end portion 56 of the coil spring is expanded linearly, then bent downward in a hook shape, extends to the bottom of the hook portion 51, and is grounded to the base 26.

When configured as described above, the elastic conductive member 53 can be easily attached to the main body 55, and the cost of the elastic conductive member 53 can be reduced. Further, when attaching the grounding fixture to the base 26, the cylindrical spacer portion 54 can be easily picked up and work can be easily performed. Furthermore, when the elastic conducting member 53 or the main body 55 is damaged, it can be replaced separately.

In addition, the present invention is not limited to the above-described embodiments, and various design changes can be made based on the description of the scope of claims.

The entire contents of the specification, claims, drawings and abstract of Japanese Patent Application No. 2010-273703 filed on Dec. 8, 2010 are incorporated herein as the disclosure of the specification of the present invention. Is.

Claims

In the grounding fixture that is fixed to the base by the flange and the elastic engagement leg, and that maintains conduction between the chassis and the chassis that is disposed opposite to the base by the elastic conductive member, the hook, the elastic engagement leg, and the spacer part, A body consisting of
An elastic conducting member supported by the main body,
The lower end of the elastic conducting member extends to the bottom of the flange and is grounded to the base.
The grounding fixture, wherein an upper end portion of the elastic conducting member extends to above the spacer portion and is grounded to the chassis.
The grounding fixing tool according to claim 1, wherein a lower end portion of the elastic conducting member extends to the base as a grounding arm and is grounded to the base,
The grounding fixture, wherein an upper end portion of the elastic conducting member extends to the spacer portion as a grounding arm and is grounded to the chassis.
The grounding fixture according to claim 1 or 2,
The elastic conducting member is a coil spring made of a wire,
A grounding fixture, wherein a winding portion of the coil spring is rotatably held by the spacer portion.
The grounding fixture according to any one of claims 1 to 3,
The coil spring is provided with a winding part at the center, grounding arms are extended at both ends, and held between support shafts formed on the spacer part at the winding part. .
The grounding fixture according to any one of claims 1 to 3,
The coil spring has a first grounding arm at the center and second grounding arms at both ends via the winding part, and the winding part is held by support shafts formed on both sides of the spacer part. By doing so, the first grounding arm and the second grounding arm are rotatably supported.
The grounding fixture according to claim 1,
The elastic conducting member is a coil spring that is detachably locked to a recess formed in the main body,
The grounding fixture, wherein an upper end portion of the coil spring extends to above the spacer portion and is grounded to the chassis.