JP3916367B2 - Grounding plate mounting structure for display device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ground plate mounting structure for a display device in which a display device is installed in a front opening of a case and a front cover is mounted on the front side of the display device via a ground plate.
[0002]
[Prior art]
FIG. 3 is an exploded perspective view of a display device that is mounted on an instrument panel of an automobile and displays the outside air temperature, the air conditioner set temperature, the average fuel consumption, the average vehicle speed, the cruising range, the clock, the audio, and the like collectively. An LCD (Liquid Crystal Display) 1 is used as a display device. The LCD 1 is installed in a front opening 3a of a case 3 made of a conductive material, and is a resin block accommodated in the case 3. 5 is fixedly held. In the LCD 1 described above, a plurality of terminals (not shown) are mounted on a printed wiring board (not shown) fixed to the block.
[0003]
A front cover 9 is attached to the front side of the LCD 1 through a ground plate 7. The ground plate 7 includes case contact surfaces 7a on both the left and right sides, while the case 3 includes a ground plate contact surface 3b with which the case contact surface 7a contacts. The ground plate 7 is fixed to the front cover 9 by pressing the front surface side with the case contact surface 7 a in contact with the ground plate contact surface 3 b of the case 3. That is, the ground plate 7 is sandwiched and fixed between the case 3 and the front cover 9.
[0004]
The front cover 9 has two lower engaging claws 9a engaged with the engaging holes 3c of the case 3, and two upper engaging claws 9b engaged with the engaging portions of the block 5. 3 is fixed.
[0005]
In the ground plate mounting structure of the display device as described above, when a user touches the operation unit 10 of the front cover 9, static electricity flows from the front cover 9 to the case 3 via the ground plate 7, and the case further From 3 to the vehicle body. This prevents static electricity from flowing into the LCD 1 and protects the LCD 1.
[0006]
[Problems to be solved by the invention]
However, such a conventional structure has the following problems.
[0007]
(1) Since the ground plate contact surface 3b of the case 3 is small, the reliability of the electrical contact state between the case 3 and the ground plate 7 is not sufficient, and if the ground plate contact surface 3b is to be enlarged, the ground plate The contact surface 3b protrudes to the side, leading to an increase in the size of the case 3.
[0008]
(2) The side surface of the case 3 is easily bent outward and inward, and it is difficult to reliably maintain contact between the ground plate contact surface 3b and the case contact surface 7a.
[0009]
(3) Since the contact state between the ground plate contact surface 3b and the case contact surface 7a depends on the fitting force between the front cover 9 and the case 3, it is necessary to consider the dimensional accuracy of other parts such as the front cover 9, It becomes difficult to maintain the contact state.
[0010]
In view of this, an object of the present invention is to satisfactorily maintain the contact state between the case and the ground plate without causing an increase in the size of the case and without considering the dimensional accuracy of other components.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, a display device is installed in a front opening of a case, and a front cover is attached to the front side of the display device via a ground plate. In the mounting structure, a contact portion between a peripheral edge of the front opening of the case and a corresponding peripheral edge of the ground plate, one peripheral edge includes a plate-shaped portion, and the other peripheral edge sandwiches the plate-shaped portion from both sides. And a sandwiching portion that is in surface contact with the plate-like portion, and a convex portion is provided on one of the one surface of the plate-like portion and the sandwiching portion opposed thereto, and the convex portion is provided on the other. It is the structure which provided the recessed part into which a part enters .
[0012]
According to the ground plate mounting structure of the display device having such a configuration, when the ground plate is attached to the case, the plate-like portion provided on one side is sandwiched by the sandwiching portion provided on the other side. The part and the clamping part are in surface contact with each other.
Further, when the plate-like portion provided on one side is clamped by the clamping portion provided on the other side, the convex portion enters the concave portion.
[0013]
According to a second aspect of the invention, in the configuration of the first aspect of the invention, the plate-like portion and the sandwiching portion are formed substantially parallel to the side surface of the case.
[0014]
According to the said structure, the expansion of the contact area at the time of enlarging the contact area of a plate-shaped part and a clamping part is substantially settled in the part which comprises the side surface of a case.
[0017]
According to a third aspect of the present invention, in the configuration of the first or second aspect of the present invention, the sandwiching portion includes a sandwiching surface that comes into surface contact with the plate-like portion, and a sandwiching piece that includes a convex portion or a recess, and the sandwiching surface and the sandwiching piece The plate-like portion is sandwiched between the two.
[0018]
According to the above configuration, when the ground plate is attached to the case, the plate-like portion is inserted between the holding surface and the holding piece, and the convex portion enters the concave portion.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0020]
FIG. 1 is an exploded perspective view of a display device having a ground plate mounting structure according to an embodiment of the present invention. This display device is mounted on the instrument panel of the car as in FIG. 3, and collectively displays the outside air temperature, air conditioner set temperature, average fuel consumption, average vehicle speed, cruising range, clock, audio, and the like. Is.
[0021]
In the front opening 13 of the case 11 made of a conductive material, an LCD 15 as a display device is installed in a state of being held in a resin block (not shown) housed in the case 11. The LCD 15 is provided with a plurality of terminals (not shown), and these terminals are mounted and fixed to a printed wiring board (not shown) fixed to the block. A front cover 19 is attached to the front side of the LCD 15 via a ground plate 17.
[0022]
Plate-like portions 21, 23, and 25 that are contact portions with the periphery of the ground plate 17 are formed at three peripheral portions of the case 11, that is, two left and right portions and one upper portion. The left and right plate-like portions 21 and 23 are formed in almost the entire vertical dimension of the case 11 and are slightly bent inward to be substantially parallel to the left and right side surfaces of the case 11. The upper plate-like portion 25 is formed at a part of the center in the left-right direction and is slightly bent inward to be substantially parallel to the upper side surface of the case 11.
[0023]
The ground plate 17 is formed with an opening 26 in the center so that the display area of the LCD 15 can be seen, and at the periphery, sandwiching portions 27, which are contact portions with the plate-like portions 21, 23, 25 of the case 11. 29 and 31 are provided in two places on the left and right sides and one place on the top.
[0024]
The left and right sandwiching portions 27 and 29 are formed in almost the entire vertical dimension of the ground plate 17 and are bent toward the case 11. The sandwiching surfaces 33 and 35 are bent substantially toward the center of the sandwiching surfaces 33 and 35. Central clamping pieces 37 and 39 that are bent toward the case 11 at a position further inside than the clamping surfaces 33 and 35 are formed. That is, a gap into which the plate-like portions 21 and 23 of the case 11 enter is formed between the clamping surfaces 33 and 35 and the central clamping pieces 37 and 39.
[0025]
In the state where the plate-like portions 21 and 23 are inserted into the gap between the holding surfaces 33 and 35 and the central holding pieces 37 and 39, the plate-like portions 21 and 23 corresponding to the central holding pieces 37 and 39 are convex. Portions 21a and 23a are formed respectively. On the other hand, the center clamping pieces 37 and 39 are formed with fitting holes 37a and 39a as concave portions into which the above-described convex portions 21a and 23a respectively enter.
[0026]
The upper clamping portion 31 of the ground plate 17 is formed at a part of the center in the left-right direction and bends toward the case 11, and from the clamping surface 41 at a substantially central portion in the left-right direction of the clamping surface 41. Furthermore, a central clamping piece 43 that is bent toward the case 11 at the inner position is provided. That is, a gap into which the plate-like portion 25 of the case 11 enters is formed between the clamping surface 41 and the central clamping piece 43.
[0027]
In the state where the plate-like portion 25 enters the gap between the holding surface 41 and the central holding piece 43, a convex portion 25a is formed on the plate-like portion 25 corresponding to the central holding piece 43. On the other hand, the center clamping piece 43 is formed with a fitting hole 43a as a concave portion into which the convex portion 25a described above enters.
[0028]
FIG. 2 is an enlarged cross-sectional view taken along the line AA with the ground plate 17 in FIG. 1 attached to the case 11, and the plate-like portion 25 of the case 11 includes the clamping surface 41 and the central clamping piece of the ground plate 17. 43 is inserted into the gap between the protrusion 43 and the protrusion 25a enters the fitting hole 43a. Here, the dimension B of the gap between the clamping surface 41 and the central clamping piece 43 is smaller than the dimension C between the upper surface of the plate-like portion 25 and the tip (lower end) of the convex portion 25a. As a result, the plate-like portion 25 is pressed upward and pressed against the clamping surface 41 in a state where the convex portion 25a enters the fitting hole 43a and comes into surface contact.
[0029]
The fitting structure as shown in FIG. 2 is the same between the left and right plate-like parts 21 and 23 and the left and right clamping parts 27 and 29, and the same dimensional relationship is applied.
[0030]
The front cover 19 is formed with an opening 45 at the center so that the display area of the LCD 15 can be seen, and an operation unit 47 for operating the display device is provided below the opening 45. Further, a total of four engaging claws 49 projecting toward the ground plate 17 are provided on the upper and lower portions of the front cover 19. Corresponding to the engaging claws 49, engaging holes 51 for engaging the engaging claws 49 are formed on the upper surface and the lower surface of the case 11.
[0031]
According to the ground plate mounting structure of the display device as described above, when the ground plate 17 is mounted on the case 11 with the LCD 15 mounted on the front opening 13 of the case 11, the plate-like portion of the case 11 is mounted. 21, 23, 25 are respectively inserted into the gaps between the clamping surfaces 33, 35, 41 and the central clamping pieces 37, 39, 43 in the clamping parts 27, 29, 31 of the corresponding ground plate 17, and FIG. As shown, the convex portions 21a, 23a, and 25a enter the fitting holes 37a, 39a, and 43a, respectively.
[0032]
Since the convex portions 21a, 23a, 25a enter the fitting holes 37a, 39a, 43a, the dimension B is set smaller than the dimension C as described in FIG. The sandwiching surfaces 33, 35, and 41 are brought into surface contact and are in close contact with each other, whereby the ground plate 17 and the case 11 are reliably maintained in electrical contact with each other.
[0033]
Since the plate-like portions 21, 23, 25 and the clamping surfaces 33, 35, 41 that are in surface contact with each other are formed substantially parallel to the side surface of the case 11, even if the contact area is increased, Therefore, the case 11 does not protrude to the outside, and the case 11 can be prevented from being enlarged.
[0034]
Further, since the convex portions 21a, 23a, 25a enter the fitting holes 37a, 39a, 43a, it is possible to prevent the ground plate 17 from being aligned and removed from the case 11. Further, since the ground plate 17 is configured to be attached to the case 11 by the sandwiching portions 27, 29, and 31, the case 11 and the ground are not dependent on other parts, that is, the front cover 19 as in the prior art. The contact state with the plate 17 can be easily maintained. In the case 11, the plate-like portions 21, 23, and 25 are sandwiched and fixed by the sandwiching surfaces 33, 35, and 41 and the center sandwiching pieces 37, 39, and 43, so that the rigidity is increased and the side surfaces are not easily bent. This is effective for maintaining the contact state.
[0035]
When the ground plate 17 is attached to the case 11, the front cover 19 is fixed to the case 11 by engaging the engaging claw 49 with the engaging hole 51 of the case 11. Thereby, the assembly of the display device is completed. In this state, when the user touches the front cover 19 by operating the operation unit 47 or the like, static electricity charged to the user flows from the front cover 19 to the ground plate 17, and further, the ground plate 17. From the sandwiching portions 27, 29, and 31 to the case 11 through plate-like portions 21, 23, and 25 in which the electrical contact state is well maintained. Thereby, the inflow of static electricity into the LCD 15 is avoided, and the LCD 15 is reliably protected.
[0036]
The plate-like portions 21, 23, 25 may be provided on the ground plate 17 side, and the holding portions 27, 29, 31 may be provided on the case 11 side, and the convex portions 21a, 23a, 25a may be provided on the central holding piece. The fitting holes 37a, 39a, 43a may be provided on the plate-like portions 21, 23, 25 side on the 37, 39, 43 side, respectively.
[0037]
【The invention's effect】
As described above, according to the first aspect of the present invention, the contact portion between the peripheral edge of the front opening of the case and the peripheral edge of the ground plate corresponding thereto is provided, one peripheral portion including the plate-shaped portion, and the other peripheral portion. Since the peripheral edge sandwiches the plate-like part from both sides and has a sandwiching part that makes surface contact with the plate-like part, the mutual contact state can be easily made without depending on dimensional errors of other parts. While being able to maintain, the rigidity of a case side surface can be improved and the contact state of a plate-shaped part and a clamping part can be maintained favorable.
In addition, since the convex portion is provided on one of the one surface of the plate-like portion and the sandwiching portion facing the plate portion, and the concave portion into which the convex portion enters is provided on the other side, the ground plate is aligned and removed from the case. Stop can be done.
[0038]
According to the invention of claim 2, since the plate-like portion and the sandwiching portion are formed substantially parallel to the side surface of the case, even if the contact area between the plate-like portion and the sandwiching portion is increased, the plate-like portion and the sandwiching portion are moved to the outside of the case. There is no protrusion, and an increase in the size of the case can be avoided.
[0040]
According to invention of Claim 3 , a clamping part is provided with the clamping surface which surface-contacts with a plate-shaped part, and the clamping piece provided with the convex part or the recessed part, A plate-shaped part is provided between a clamping surface and a clamping piece. Since it is sandwiched, the contact state between the case and the ground plate can be maintained satisfactorily.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a display device having a ground plate mounting structure according to an embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view taken along the line AA in a state where the ground plate in FIG. 1 is attached to the case.
FIG. 3 is an exploded perspective view of a display device having a ground plate mounting structure according to a conventional example.
[Explanation of symbols]
11 Case 13 Front opening 15 LCD (display device)
17 Ground plate 19 Front cover 21, 23, 25 Plate-like parts 21a, 23a, 25a Convex parts 27, 29, 31 Clamping parts 33, 35, 41 Clamping surfaces 37, 39, 43 Center clamping pieces 37a, 39a, 43a Fitting Hole (concave)

Claims (3)

In a ground plate mounting structure of a display device in which a display device is installed in the front opening of the case, and a front cover is attached to the front side of the display device via a ground plate, the periphery of the front opening of the case and the periphery thereof Corresponding contact portions with the periphery of the ground plate, one periphery includes a plate-shaped portion, and the other periphery includes a sandwiching portion that sandwiches the plate-shaped portion from both sides and is in surface contact with the plate-shaped portion. A display device, characterized in that a convex portion is provided on one of the surface of the plate-like portion and the sandwiching portion facing the plate-like portion, and a concave portion into which the convex portion enters is provided on the other side . Ground plate mounting structure.   2. The ground plate mounting structure for a display device according to claim 1, wherein the plate-like portion and the sandwiching portion are formed substantially parallel to the side surface of the case. The sandwiching portion includes a sandwiching surface that comes into surface contact with the plate-like portion and a sandwiching piece that includes a convex portion or a recess, and sandwiches the plate-like portion between the sandwiching surface and the sandwiching piece. 3. A ground plate mounting structure for a display device according to 1 or 2 .

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