JPH04192498A - Continuity structure of cabinet to cover - Google Patents

Abstract

PURPOSE:To connect a cabinet to a cover by means of an impedance by a structure wherein a contact tongue piece for a conductive elastic sheet which comes into close contact with the cover is brought into pressure-contact with a front frame at the cabinet. CONSTITUTION:In a state that a close-contact sheet member 21 has been brought into close contact with the surface of a cover inner-frame sheet 12, a conductive elastic sheet 20 is arranged and installed on a cover 10. As a result, when the cover 10 is attached to a cabinet 1 by an attachment means such as a screw mechanism or the like, a contact tongue piece 22 for the conductive elastic sheet 20 is brought into pressure-contact with the surface of a front frame 3 at the cabinet 1. Consequently, without pressing the cover 10 to the side of the cabinet strongly, the cover 10 and the cabinet 1 are set to an elastic continuity state via the conductive elastic sheet 20. Thereby, an operation to attach the cover 10 to the cabinet 1 can be performed simply, the cabinet 1 and the cover 10 are connected by means of a low impedance and costs can be lowered.

Description

[Detailed Description of the Invention] [Summary] Regarding modification of the conduction structure between the cabinet and the cover of electronic equipment, the work of attaching the cover to the cabinet is easy, and the connection between the cabinet and the cover is made with low impedance.
With the aim of providing a conductive structure that is both low-cost and has a front frame with an open front, the cabinet has an electronic unit mounted inside the front frame, and a cover inner frame plate is located in the front frame. Together, they include a shallow box-shaped cover that covers the opening of the electronic unit, a mounting means for removably fixing the cover to the front frame, and a close contact plate member whose back surface is in close contact with the surface of the inner frame plate of the cover. , a conductive elastic plate consisting of a contact tongue protruding from the surface side of the contact plate member, a main plate member whose inner surface is in close contact with the back surface of the cover inner frame plate, and an inner surface of which is in close contact with the surface of the contact plate member. It is configured to include a fixing plate which is a sub-plate member and has a U-shape in side view.

[Industrial application field]

The present invention relates to modification of a conductive structure between a cabinet and a cover of an electronic device.

In recent years, electronic equipment as shown in FIG. 4 has been widely used.

4(a) is a perspective view of the cabinet, FIG. 4(b) is a front perspective view of the cover, and FIG. 4(C) is a rear perspective view of the cover.

In FIG. 4(a), 2 is an electronic unit in which electronic components such as a printed board are mounted on a box-shaped shelf with an open front.

1 is a vertically long cabinet with an open front. The electronic units 2 are mounted on the cabinet 1 in multiple stages by installing the front frames 3 in multiple stages on the opening surface of the cabinet 1, and inserting and installing the electronic units 2 into the central windows of the respective front frames 3.

On the other hand, the cover 10 that closes the opening of the electronic unit 2 includes a main cover plate 11 having almost the same shape as the opening of the electronic unit, a side plate by bending the four sides of the main cover plate 11 at right angles, and a side plate by bending the side plate inward at right angles. It has a shallow box shape with a cover inner frame plate 12 provided.

The cover 10 is attached by means of attachment as shown in FIG.
It is detachably fixed to the cabinet 1.

In FIG. 5, reference numeral 6 denotes a substantially gate-shaped engagement fitting fixed to a desired location on the surface of the front frame 3 with rivets. The shaft of the fastener 5 (
A hole 8 is bored into which a wire (to be described later) is loosely inserted, and an elastic S-shaped wire 7 is fixed to the back side of the upper plate so as to bridge this hole 8.

This S-shaped wire 7 has an S-shaped upper end and a lower end fixed to the upper plate by welding or rivet means, and the central curved part of the S-shaped wire 7 has a gap from the back surface of the upper plate. It is fixed to the engaging metal fitting 6.

On the other hand, numeral 5 denotes a fastener whose shank protrudes from the axial center of the disk-shaped head, and the shank has a spiral groove 5a with which the S-shaped wire 7 engages.

A slot is provided in the head of the fastener 5, and a coin or the like is inserted into the slot to rotate the fastener 5.

Further, a hole 9 is bored in the cover main plate 11 of the cover 10 in a manner corresponding to the hole 8 of the engaging metal fitting 6, into which the shaft portion of the fastener 5 is loosely inserted.

Therefore, the cover 10 is aligned with the opening of the electronic unit 2, the surface of the cover inner frame plate 12 is brought into contact with the surface of the frame member 3, and the hole 9 of the cover 10 is brought into contact with the surface of the frame member 3. When the fastener 5 is inserted into the hole 8 of the engagement fitting 6 and rotated, the S-shaped wire 7 bites into the spiral groove 5a.

Then, when the fastener 5 is further rotated approximately 90 degrees, the S
The shaped wire 7 is screwed into the spiral groove 5a, and the fastener 5 is screwed into the engagement fitting 6. That is, it is drawn toward the cabinet 1 side.

As a result, the cover 10 is drawn toward the cabinet 1, and the cover 10 is fixed to the cabinet 1.

In the electronic device configured as described above, if the cover 10 and the cabinet 1 are insulated, a person can
When you touch 0, the static charge accumulated in your body will be removed by cover 10.
Moving on, there is a risk that a discharge will occur between the cover 10 and the cabinet 1, and the semiconductor elements etc. mounted in the electronic unit 2 may be damaged.

Further, if there is a gap longer than a predetermined distance between the cover and the frame member, electromagnetic interference will occur.

Therefore, with the cover attached to the cabinet,
The cover and the frame member, ie, the cabinet, are required to be in electrical continuity.

[Conventional technology]

FIG. 6 is a perspective view of a conventional cover.

In FIG. 6, 15 has a thickness of about 2 mm and a width of about 5 mm.
This is an electrically conductive felt in which metal filler is embedded in brush-like shapes within a long and narrow strip of felt.

Such a conductive felt 15 is adhered in a frame shape to the surface of the cover inner frame plate 12 with a conductive adhesive.

Therefore, when the cover 10 is attached to the cabinet,
The conductive felt 15 is pressed against the surface of the cabinet frame member. In other words, the cover and the cabinet are electrically connected.

[Problem to be solved by the invention]

However, in the conventional structure in which electrical continuity is established through conductive felt, the conductive felt is flexible and easily breaks, making it difficult to adhere the conductive felt to the cover in a frame-like manner.

Furthermore, in order to lower the impedance, it is necessary to press the conductive felt against the frame member with strong force, but it has been difficult to apply such strong force to the cover with a fastener.

Furthermore, since the conductive felt and the conductive adhesive are relatively expensive, there is a risk that the cost of the conductive structure between the cabinet and the cover will be high.

The present invention was created in view of these points, and provides a conductive structure that allows easy installation of the cover to the cabinet, connects the cabinet and cover with low impedance, and is low cost. is intended to provide.

[Means to solve the problem]

To achieve the above object, the present invention provides a cabinet 1 having a front frame 3 with an open front, mounting an electronic unit 2 in the front frame 3, and a cover inner frame, as illustrated in FIG. By aligning and fixing the plate 12 to the front frame 3, a shallow box-shaped cover 1 that covers the opening of the electronic unit 2 is formed.
In the electronic device consisting of 0, mounting means for removably fixing the cover 10 to the front frame 3 is provided.

A close contact plate member 21 that is in close contact with the surface of the cover inner frame plate 12 on the back side, and a contact tongue piece 2 that protrudes toward the front side of the close contact plate member 21.
A conductive elastic plate 20 consisting of 2 is provided.

Further, a fixing plate 30 having a U-shape in side view is provided, which is composed of a main plate member 31 whose inner side is in close contact with the back surface of the cover inner frame plate 12, and a sub-plate member 32 whose inner side is in close contact with the surface of the adhesion plate member 21.

The conductive elastic plate 20 is arranged at a selected location on the cover inner frame plate 12, and the overlapping cover inner frame plate 12 and contact plate member 21 are held between the main plate member 31 and the sub-plate member 32 of the fixing plate 30. Then, the conductive elastic plate 20 is fixedly attached to the cover 10.

Further, as shown in FIG. 3, a protrusion 40 of a desired height is provided on the outer surface of the sub-plate member 32 of the fixing plate 30.

[Effect]

As described above, the plate member 21 is attached to the surface of the cover inner frame plate 12.
When the conductive elastic plate 20 or the cover 10 is in close contact with each other,
It is located in

Therefore, when the cover 10 is attached to the cabinet 1 by an attachment means such as a screw mechanism, the contact tongue piece 22 of the conductive elastic plate 20 comes into pressure contact with the surface of the front frame 3 of the cabinet.

Therefore, even if the cover 10 is not pressed strongly against the cabinet side, the cover IO and the cabinet 1 can be connected to the conductive elastic plate 2.
It becomes electrically conductive through 0.

Note that by attaching a desired number of conductive elastic plates 20 to the cover 10, the impedance between the cover and the cabinet becomes even lower.

The conductive elastic plate 20 described above can be easily mass-produced by pressing a thin metal plate, and the fixing plate 30 can be easily mass-produced by molding or pressing a metal plate. You can do it.

Therefore, the conductive structure of the present invention is low cost.

The height of the protrusion 40 is such that when the cover 10 is attached to the cabinet and the contact tongue piece 22 is in pressure contact with the surface of the front frame 3 of the cabinet, the tip of the protrusion 40 comes into contact with the surface of the front frame 3. Set to a specified height.

By providing such a protrusion 40, when the cover 10 is attached to the cabinet, the contact tongue piece 22 does not overlap and come into close contact with the contact plate member 21.

That is, since the contact tongue piece 22 is prevented from buckling and plastically deforming, the springiness of the contact tongue piece 22 is maintained. Therefore, the reliability of conduction between the cabinet and the cover is guaranteed for a long time.

〔Example〕

The present invention will be specifically described below with reference to FIGS. 1 to 3. Note that the same reference numerals indicate the same objects throughout the figures.

FIG. 1 is a diagram of an embodiment of claim 1, in which (a) is a perspective view showing key parts separated, FIG. 2 (b) is a sectional view, FIG. 2 is a perspective view showing the inside of the cover, and FIG. The figures are diagrams of an embodiment of claim 2, in which (a) is a perspective view of the fixing plate, and (bl is a sectional view showing important parts of the cover).

1 and 2, the electronic device has a front frame 3 with an open front side, a cabinet 1 in which an electronic unit 2 is mounted inside the front frame 3, and a cover inner frame plate 12 attached to the front frame 3. A shallow box-shaped cover 10 that covers the opening of the electronic unit 2 is formed by contacting the opening of the electronic unit 2.

The cover 10 opens the opening of the electronic unit 2 by inserting a fastener 5 into a hole drilled at a desired position in the cover main board 1 and screwing it onto a fastening fitting 6 fixed to the front frame 3 of the cabinet 1. It's supposed to be blocked.

The cover inner frame plate 12 of the cover 10 has small holes 1 arranged in a row at equal pitches along the inner edge of the cover inner frame plate 12.
3 is arranged.

20 is a conductive elastic plate formed by pressing a thin phosphor bronze plate or the like and provided with a contact plate member 21 and a contact tongue piece 22.

The conductive elastic plate 20 has contact tongue pieces 2 on both sides of a rectangular contact plate member 21 that are shaped like a letter when viewed from the side so as to protrude toward the surface side.
2 is provided. Furthermore, a pair of claws are provided by bending both ends of the longitudinal side edges of the contact plate member 21 at right angles.

Such a conductive elastic plate 20 can be assembled by aligning the back surface of the contact plate member 21 with the surface of the cover inner frame plate 12 and engaging the claws with the inner edge of the cover inner frame plate 12. placed on the surface.

On the other hand, 30 is made of molded synthetic resin or pressed stainless steel, and is made up of a rectangular main plate member 31 and a rectangular sub-plate member 32 whose length is shorter than the main plate member 31. It is an elastic fixing plate that is U-shaped when viewed from the side.

The gap 33 between the main plate member 31 and the sub-plate member 32 is slightly smaller than the sum of the plate thickness of the cover inner frame plate 12 and the plate thickness of the contact plate member 21.

In addition, on the inner surface near both ends of the main plate member 31,
A pin 35 is provided to fit into the hole I3 of the cover inner frame plate 2.

The conductive elastic plate 20 configured as described above is attached to the cover 10.
The contact plate members 21 are placed on selected desired locations on the surface of the cover inner frame board 12 so as to be in close contact with each other.

Next, push the fixing plate 30 from inside to outside of the cover inner frame plate I2 so that it enters the gap 33 between the overlapping cover inner frame plate 12 and the contact plate member 21, and fit the pin 35 into the hole 13. let

As a result, the cover inner frame plate 12 and the contact plate member 21 are integrally held together by the elasticity of the main plate member 31 and the sub-plate member 32. Therefore, the back surface of the contact plate member 21 comes into close contact with the surface of the cover inner frame board 12.

Therefore, as shown in FIG. 2, a desired number of conductive elastic plates 20 are arranged on the cover inner frame plate 12 of the cover IO,
Moreover, the cover IO and each conductive elastic plate 20 are electrically connected.

When the cover 10 is aligned with the front frame 3 of the cabinet 1 and the fastener 5 is screwed onto the engagement fitting 6 of the cabinet 1, the contact tongue piece 22 of the conductive elastic plate 20 will close as shown in FIG. 1(b). It is pressed against the surface of the front frame 3 of the cabinet.

Therefore, even if the cover 10 is not pressed strongly against the cabinet side, the cover 10 and the cabinet 1 are connected to the conductive elastic plate 2.
It becomes electrically conductive through 0.

Therefore, even if a person touches the cover 10, no electrostatic discharge occurs, and the semiconductor elements mounted on the electronic unit 2 will not be damaged.

On the other hand, the conductive elastic plate 20 described above can be easily mass-produced by pressing a thin metal plate.
0 can be easily mass-produced by molding or pressing a metal plate, and the unit price of each part is low.

Therefore, the conductive structure between the cabinet and the cover of the present invention can be made low-cost by installing the conductive elastic plates 20 in the minimum number that will not cause electromagnetic interference, taking into account the environmental characteristics. can.

In the invention of claim 2, as shown in FIG.
This is provided.

The height of this protrusion 40 is determined when the cover 10 is attached to the cabinet 1 and the contact tongue piece 22 is adjusted as shown in FIG. 3(b).
The tip of the protrusion 40 is at a predetermined height such that the tip of the protrusion 40 comes into contact with the surface of the front frame 3 of the cabinet while the protrusion 40 is in pressure contact with the surface of the front frame 3 of the cabinet.

Therefore, when the cover 10 is attached to the cabinet 1, the contact tongue piece 22 does not fold over and come into close contact with the contact plate member 21, so that the contact tongue piece 22 is prevented from buckling and plastically deforming.

That is, the springiness of the contact tongue piece 22 is maintained, and the reliability of electrical continuity between the cabinet and the cover is guaranteed for a long time.

〔Effect of the invention〕

As explained above, the present invention has a structure in which the contact tongue piece of the conductive elastic plate that is in close contact with the cover comes into pressure contact with the front frame of the cabinet, so that the inner frame plate of the cover can be pressed against a uniform flat surface with high precision. Even if it is not manufactured, a low impedance connection is made between the cabinet and the cover.

That is, since no electrostatic discharge occurs, it is possible to prevent damage to semiconductor elements mounted on the electronic unit.

In addition, the unit prices of the conductive elastic plate and the fixing plate that constitute the conduction mechanism are low, and the work of attaching them to the cover is easy.
And since the work of attaching the cover to the cabinet is simple, the cost of the conductive structure between the cabinet and the cover is low.

[Brief explanation of the drawing]

1 is a diagram of an embodiment of claim 1, (a) is a perspective view showing important parts in separated form, (b) is a sectional view, FIG. 2 is a perspective view showing the inside of the cover, The figures are views of an embodiment of claim 2, (a) is a perspective view of the fixing plate, (b) is a cross-sectional view showing important parts of the cover, FIG. 4 is a perspective view of the electronic device, and (a) is a perspective view of the fixing plate. (b) is a front perspective view of the cover; (C) is a back perspective view of the cover; Figure 5 is a perspective view of important parts of the cabinet; Figure 6 is a perspective view of a conventional cover. . In the figure, 1 is a cabinet, 2 is an electronic unit, 3 is a front frame, 5 is a fastener, 6 is an engaging fitting,
7 is an S-shaped wire, 10 is a cover,
11 is the cover main plate, 12 is the cover inner frame plate,
13 is a hole, 15 is a conductive felt, 2o is a conductive elastic plate, 21 is a contact plate member, 22 is a contact tongue piece, 3
0 indicates a fixed plate, 31 indicates a main plate member, 32 indicates a sub-plate member, 35 indicates a pin, and 40 indicates a protrusion. (b) K ex-husband D co 1 of 3 donations "・10shi" Cover n Minister of Home Affairs・
1N showing T test diagram ゛ゝ12 Figure 2 (b) T-example n diagram of 蹭東section 2 (α) Electronic 4R accent 0 standard diagram Figure 4 Doya Lko, Tonoya blood slanting Shiguchi Fig. 5 12 Cover inner frame plate (15 parts) Hflu diagram of conventional cover Fig. 6

Claims (1)

[Scope of Claims] [1] It has a front frame (3) whose front side is open, and the front frame (
3) A cabinet (within which the electronic unit (2) is installed)
1), a shallow box-shaped cover (10) that covers the opening of the electronic unit (2) by positioning and fixing the cover inner frame plate (12) to the front frame (3), and the front frame (3) a mounting means for removably fixing the cover (10) to the cover (10); a close contact plate member (21) whose back surface is in close contact with the surface of the cover inner frame plate (12); A conductive elastic plate (20) consisting of a contact tongue piece (22) protruding toward the surface side
and a main plate member (31) whose inner surface is in close contact with the back surface of the cover inner frame plate (12), and a sub-plate member (32) whose inner surface is in close contact with the surface of the adhesion plate member (21) in side view. The fixing plate (30) includes the main plate member (31) and the secondary plate member (32), and the contact plate member (30) of the conductive elastic plate (20).
21) and the cover inner frame plate (12) are held in a superimposed state to attach the conductive elastic plate (20) to a selected location of the cover inner frame plate (12). A conductive structure between a cabinet and a cover, characterized by: [2] On the outer surface side of the secondary plate member (32) of the fixed plate (30),
characterized in that a protrusion (40) of a desired height is provided;
A conductive structure between the cabinet and the cover according to claim 1.