JP7101503B2 - Antistatic structure and in-vehicle equipment - Google Patents

Description

The present invention relates to an antistatic structure in an in-vehicle device having a display integrated with a touch panel, and an in-vehicle device having the antistatic structure.

Conventionally, a display such as a liquid crystal display is grounded to strengthen the ground in order to suppress the generation of electromagnetic noise. For example, in the invention according to Patent Document 1, an optical filter coated with a conductor is arranged on the front surface side of the plasma display panel (PDP), and a plate-shaped conductor connected to the ground is arranged on the back surface side of the PDP. Then, the conductor of the optical filter and the plate-shaped conductor are electrically connected by a leaf spring.

When the touch panel is integrated on the surface of the display, when the operator touches the touch panel, the static electricity accumulated in the operator's hand enters the control board of the display and causes the display to malfunction. Therefore, conventionally, a display integrated with a touch panel is provided with an antistatic structure for releasing static electricity.

Japanese Unexamined Patent Publication No. 10-319855

Conventionally, since the ground strengthening structure for electromagnetic noise countermeasures and the antistatic structure for static electricity countermeasures are provided independently, there is a problem that the number of parts is large.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to reduce the number of parts for measures against electromagnetic noise and static electricity.

The antistatic structure according to the present invention includes a metal display holder that holds a display with an integrated touch panel, and a metal that electrically connects to the display holder and holds a control board of the display on the back side of the display. A board holder made of wood, a metal chassis that is connected to the ground and covers the control board of the display on the back side of the display, and a first leaf spring part and a chassis that are electrically connected to the display holder. The chassis has a convex portion extending in the direction of the display, and the second leaf spring portion of the plate presses against the convex portion of the chassis . ..

According to the present invention, since the display holder and the chassis are electrically connected via the plate, static electricity and electromagnetic noise flow from the plate to the chassis and flow to the ground. Therefore, the structure for releasing static electricity and the ground reinforcement can be performed with the plate, and the number of parts can be reduced.

It is an exploded perspective view which shows the structural example of the vehicle-mounted device which concerns on Embodiment 1. FIG. 2A and 2B are perspective views showing a configuration example of the plate according to the first embodiment. An example of the configuration of the plate according to the first embodiment, FIG. 3A is a plan view, FIG. 3B is a rear view, and FIG. 3C is a side view. It is a perspective view which shows the state which the panel and the plate are assembled in Embodiment 1. FIG. It is a rear view which shows the configuration example of the vehicle-mounted device which concerns on Embodiment 1. FIG. FIG. 5 is a cross-sectional view taken along the line AA of FIG. 5 of the in-vehicle device according to the first embodiment. FIG. 5 is a cross-sectional view taken along the line BB of FIG. 5 of the vehicle-mounted device according to the first embodiment. It is a reference example for helping the understanding of the plate which concerns on Embodiment 1, and is the perspective view which shows the state before assembling a panel, a plate and a display holder. It is a reference example for helping the understanding of the plate which concerns on Embodiment 1, and is the perspective view which shows the state which the panel, the plate and the display holder are assembled. It is a reference example for helping the understanding of the plate which concerns on Embodiment 1, and is the rear view which shows the state which the panel, the plate, the display holder and the substrate holder are assembled.

Embodiment 1.
FIG. 1 is an exploded perspective view showing a configuration example of the in-vehicle device 1 according to the first embodiment. The in-vehicle device 1 includes a display 10, a display holder 20, a substrate holder 30, a chassis 40, a plate 50, and a panel 60. Further, the antistatic structure according to the first embodiment includes the display holder 20, the substrate holder 30, the chassis 40, and the plate 50 in the in-vehicle device 1. The in-vehicle device 1 is a device mounted on a vehicle such as a car audio device, a car navigation device, or a center display device, and is installed on a dashboard or the like of the vehicle.

The display 10 is, for example, a liquid crystal display. A touch panel 11 shown in FIGS. 6 and 7 described later is installed on the surface of the display 10. A flexible print circuit 13 (hereinafter referred to as “FPC13”) is provided at the center of the lower side of the touch panel 11. Further, the surface of the display 10 on which the touch panel 11 is installed is exposed from the opening 61 formed in the panel 60. The panel 60 is made of resin or the like.

The display holder 20 is a metal holder that holds the display 10 in which the touch panel 11 is integrated. The display holder 20 in the illustrated example holds the display holder 20 by surrounding the side surface of the display 10.

The board holder 30 is a metal holder that holds the control board of the display 10 (not shown) on the back surface side of the display 10. In the illustrated example, the control board of the display 10 is fixed to the back surface of the board holder 30. The FPC 13 of the touch panel 11 is connected to the control board of the display 10.

The chassis 40 is a metal housing that is electrically connected to a ground (not shown). The chassis 40 of the illustrated example covers the control board of the display 10 held by the board holder 30 on the back surface side of the display 10. A metal housing containing a control board such as a car audio device or a car navigation device (not shown) is fixed to the back surface of the chassis 40. The chassis 40 may be connected to the ground via the metal housing (not shown). Further, a convex portion 44 extending in the direction of the display 10 is formed in the central portion of the lower side of the chassis 40. The convex portion 44 is arranged below the FPC 13 of the touch panel 11.

Two screw fastening portions 21 formed on both ends of the upper side of the display holder 20, two screw fastening portions 31 formed on both ends of the upper side of the board holder 30, and two formed on both ends of the upper side of the chassis 40. The screw fastening portion 41 is fastened together with the panel 60 by two screws (not shown). Further, the two screw fastening portions 21 formed on both ends of the lower side of the display holder 20 and the two screw fastening portions 31 formed on both ends of the lower side of the board holder 30 are attached to the panel 60 by two screws (not shown). It is tightened together. Further, the four screw fastening portions 32 formed on both ends of the left side and both ends of the right side of the board holder 30 and the four screw fastening portions 42 formed on both ends of the left side and both ends of the right side of the chassis 40 are not shown. It is fastened to the panel 60 together with four screws. Further, the two screw fastening portions 43 formed at both ends of the lower side of the chassis 40 are fastened to the panel 60 by two screws (not shown). By fastening these screws, the display holder 20, the board holder 30, the chassis 40, and the panel 60 are fixed to each other, and the metal display holder 20, the board holder 30, and the chassis 40 are electrically connected to each other.

2A and 2B are perspective views showing a configuration example of the plate 50 according to the first embodiment. 3A and 3B are configuration examples of the plate 50 according to the first embodiment, FIG. 3A is a plan view, FIG. 3B is a rear view, and FIG. 3C is a side view. FIG. 4 is a perspective view showing a state in which the panel 60 and the plate 50 are assembled in the first embodiment.

The plate 50 is a metal member fixed to the lower part of the back surface of the panel 60. For example, the plate 50 and the panel 60 are fixed by fitting the boss formed on the back surface of the panel 60 into the boss hole formed in the plate 50. The plate 50 is arranged according to the position of the FPC 13. In the illustrated example, since the FPC 13 is provided at the center of the lower side of the touch panel 11, the plate 50 is arranged at the lower center of the back surface of the panel 60 in accordance with the position of the FPC 13.

The plate 50 is formed from one or more first leaf spring portions 51 that are electrically connected to the display holder 20, one or more second leaf spring portions 52 that are electrically connected to the chassis 40, and the lower part of the panel 60. It has one or more extensions 53 extending in the direction of the opening 61. In the illustrated example, the number of the first leaf spring portion 51, the second leaf spring portion 52, and the extension portion 53 is two, but the number may be arbitrary.

FIG. 5 is a rear view showing a configuration example of the in-vehicle device 1 according to the first embodiment. FIG. 6 is a cross-sectional view of the vehicle-mounted device 1 according to the first embodiment cut along the line AA of FIG. FIG. 7 is a cross-sectional view of the vehicle-mounted device 1 according to the first embodiment cut along the line BB of FIG. A touch panel 11 and a protective cover 12 for protecting the touch panel 11 are arranged on the surface side of the display 10, that is, the surface side exposed to the opening 61 of the panel 60.

The two first leaf spring portions 51 press against the two first leaf spring portion contact portions 23 at both ends of the FPC 13 on the lower surface of the display holder 20 and are electrically connected to the display holder 20. The two second leaf spring portions 52 press against the convex portion 44 formed in the central portion of the lower side of the chassis 40 and are electrically connected to the chassis 40. By electrically connecting the display holder 20 and the chassis 40 to the first leaf spring portion 51 and the second leaf spring portion 52 of the plate 50, the electrical connection between the display holder 20 and the chassis 40 is strengthened. The influence of electromagnetic noise on the display 10 and the like is reduced. Further, since the first leaf spring portion 51 and the second leaf spring portion 52 have a leaf spring structure, it is possible to absorb the component tolerance between the display holder 20 and the chassis 40.

As shown in FIGS. 6 and 7, the extension 53 of the plate 50 is located closer to the opening 61 than the FPC 13. Therefore, when the operator touches the touch panel 11 exposed in the opening 61 of the panel 60, the static electricity accumulated in the operator's hand flows to the extension portion 53 instead of the FPC 13. The static electricity flowing to the extension portion 53 flows from the first leaf spring portion 51 to the display holder 20, flows to the board holder 30 via the screw fastening portions 21, 31 and passes through the screw fastening portions 31, 32, 41, 42. It flows to the chassis 40 and finally to the ground. On the way, the static electricity flowing to the display holder 20 may flow from the protrusion 22 of the display holder 20 to the protrusion contact portion 33 of the substrate holder 30, as will be described later. Further, the static electricity flowing to the extension portion 53 directly flows from the second leaf spring portion 52 to the chassis 40, and finally flows to the ground. If static electricity flows through the FPC 13 and enters the control board of the display 10 (not shown), it causes a malfunction of the display 10.

FIG. 8 is a reference example for assisting the understanding of the plate 50 according to the first embodiment, and is a perspective view showing a state before assembling the panel 60, the plate 50a, and the display holder 20. FIG. 9 is a reference example for assisting the understanding of the plate 50 according to the first embodiment, and is a perspective view showing a state in which the panel 60, the plate 50a, and the display holder 20 are assembled. FIG. 10 is a reference example for assisting the understanding of the plate 50 according to the first embodiment, and is a rear view showing a state in which the panel 60, the plate 50a, the display holder 20 and the substrate holder 30 are assembled.

The reference example shown in FIGS. 8 to 10 has the same configuration as the in-vehicle device 1 of the first embodiment except that the plate 50a is used instead of the plate 50 of the first embodiment. The plate 50a of the reference example is a component used as a countermeasure against static electricity. The plate 50a of the reference example is not formed with the second leaf spring portion 52, whereas the plate 50 of the first embodiment is different in that the second leaf spring portion 52 is formed.

As shown in FIG. 8, the two first leaf spring portions 51 of the plate 50a are electrically connected to the two first leaf spring portion contact portions 23 of the display holder 20. Further, as shown in FIGS. 8 and 9, the display holder 20 is formed with a plurality of protrusions 22 that come into contact with the substrate holder 30. As shown in FIG. 10, the plurality of protrusions 22 come into contact with the plurality of protrusion contact portions 33 of the substrate holder 30 and are electrically connected to each other. Further, the board holder 30 is electrically connected to the chassis 40 by the four screw fastening portions 32.
It is assumed that the display holder 20 of the first embodiment also has a plurality of protrusions 22 formed as in the reference example.

As shown by the arrow 100 in FIG. 10, in the reference example, electromagnetic noise flows from the display holder 20 through the protrusion 22 and the protrusion contact portion 33 to the substrate holder 30, and from the protrusion contact portion 33 of the board holder 30 to the screw fastening portion. Flow to 32. The board holder 30 and the chassis 40 are connected only by screw fastening portions 32 at the four corners, and the lower central portion 34 of the board holder 30 is not connected to the chassis 40 because the FPC 13 is arranged. Therefore, the path through which the electromagnetic noise flows to the ground becomes long, and the electromagnetic noise may cause the display 10 or the like to malfunction.

In the reference example, static electricity flows from the extension portion 53 of the plate 50a to the display holder 20 via the first leaf spring portion 51. After that, the static electricity flows from the protrusion contact portion 33 of the substrate holder 30 to the screw fastening portion 32 and flows from the chassis 40 to the ground in the same manner as the electromagnetic noise. The static electricity may finally flow to the ground, and the length of the distance does not affect the performance of the in-vehicle device 1.

As described above, the reference example has a configuration in which the display holder 20 and the chassis 40 are electrically connected via the substrate holder 30. On the other hand, in the first embodiment, since the plate 50 has the second leaf spring portion 52 in contact with the chassis 40, the display holder 20 and the chassis 40 are electrically connected to each other without using the substrate holder 30. Is. Further, the place where the plate 50 is arranged is a place where the protrusion 22 and the protrusion contact portion 33 cannot be formed due to the presence of the FPC 13. Therefore, in the first embodiment, the electromagnetic noise flows from the display holder 20 to the chassis 40 via the plate 50, and the electromagnetic noise flows in the first embodiment from the reference example because the distance through which the electromagnetic noise flows is shorter and the ground can be strengthened. .. Further, if the distance between the first leaf spring portion 51 and the second leaf spring portion 52 is shortened, the distance through which electromagnetic noise flows can be further shortened.

As described above, the antistatic structure according to the first embodiment includes a display holder 20, a substrate holder 30, a chassis 40, and a plate 50. The display holder 20 is a metal holder that holds the display 10 in which the touch panel 11 is integrated. The board holder 30 is a metal holder that is electrically connected to the display holder 20 and holds the control board of the display 10 on the back surface side of the display 10. The chassis 40 is a metal housing that is connected to the ground and covers the control board of the display 10 on the back surface side of the display 10. The plate 50 is a metal member having a first leaf spring portion 51 electrically connected to the display holder 20 and a second leaf spring portion 52 electrically connected to the chassis 40. Since the display holder 20 and the chassis 40 are electrically connected via the plate 50, static electricity and electromagnetic noise flow from the plate 50 to the chassis 40 and flow to the ground. Therefore, the structure for releasing static electricity and the ground strengthening can be performed on the plate 50, and the number of parts can be reduced.

Further, the plate 50 of the first embodiment may have a plurality of first leaf spring portions 51. As the number of the first leaf spring portions 51 increases, the electrical connection between the plate 50 and the display holder 20 is strengthened.

Further, in the first embodiment, when the plate 50 has a plurality of first leaf spring portions 51, it is desirable that the plurality of first leaf spring portions 51 are arranged so as to sandwich the FPC 13 of the touch panel 11 in between. This makes it possible to prevent static electricity and electromagnetic noise from flowing through the FPC 13.

Further, the plate 50 of the first embodiment may have a plurality of second leaf spring portions 52. As the number of the second leaf spring portions 52 increases, the electrical connection between the plate 50 and the chassis 40 is strengthened.

Further, in the first embodiment, it is desirable that the first leaf spring portion 51 and the second leaf spring portion 52 are arranged side by side. The closer the distance between the first leaf spring portion 51 and the second leaf spring portion 52 is, the shorter the distance through which electromagnetic noise flows, and the malfunction of the display 10 or the like can be suppressed.

Further, in the first embodiment, the chassis 40 has a convex portion 44 extending in the direction of the display 10. The second leaf spring portion 52 of the plate 50 presses against the convex portion 44 of the chassis 40. With this configuration, the component tolerance between the chassis 40 and the plate 50 can be absorbed, and the electrical connection between the chassis 40 and the plate 50 can be strengthened.

Further, by applying the antistatic structure according to the first embodiment to the in-vehicle device 1, it is possible to reduce the size and weight of the in-vehicle device 1. Since the first leaf spring portion 51 and the second leaf spring portion 52 of the plate 50 have elasticity, the electrical connection between the display holder 20 and the chassis 40 is surely secured even when the plate 50 is subjected to vibration during traveling. ..

In the present invention, it is possible to modify any component of the embodiment or omit any component of the embodiment within the scope of the invention.

1 In-vehicle device, 10 Display, 11 Touch panel, 12 Protective cover, 13 FPC, 20 Display holder, 21 Screw fastening part, 22 Protrusion, 23 First leaf spring part contact part, 30 Board holder, 31, 32 Screw fastening part, 33 Protrusion contact part, 34 lower center part, 40 chassis, 41, 42, 43 screw fastening part, 44 convex part, 50, 50a plate, 51 first leaf spring part, 52 second leaf spring part, 53 extension part, 60 panel , 61 openings, 100 arrows.

Claims (6)

A metal display holder that holds a display with an integrated touch panel,
A metal substrate holder that is electrically connected to the display holder and holds the control substrate of the display on the back surface side of the display.
A metal chassis that connects to the ground and covers the control board of the display on the back side of the display.
A metal plate having a first leaf spring portion electrically connected to the display holder and a second leaf spring portion electrically connected to the chassis is provided.
The chassis has a protrusion extending in the direction of the display.
The second leaf spring portion of the plate has an antistatic structure that presses against the convex portion of the chassis. The antistatic structure according to claim 1 , wherein the plate has a plurality of the first leaf spring portions. The antistatic structure according to claim 2 , wherein the plurality of first leaf spring portions included in the plate are arranged so as to sandwich the flexible print circuit of the touch panel. The antistatic structure according to claim 1 , wherein the plate has a plurality of second leaf spring portions. The antistatic structure according to claim 1 , wherein the first leaf spring portion and the second leaf spring portion are arranged side by side. An in-vehicle device comprising the antistatic structure according to any one of claims 1 to 5 .

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