JPH0219866Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a touch panel installed in front of a display screen of a CRT or the like, and particularly relates to a grounding structure for the touch panel.

[Background of the idea]

A touch panel, which consists of an integral layer of opposing upper and lower electrodes, a holding plate, a shield plate, etc., is installed in front of the display surface of a CRT, LCD (liquid crystal display), etc. installed in the main body. It is a transparent body that is slightly wider than the display surface. Then, by pressing a desired position of the upper electrode with a pointer such as a fingertip or a pen, the upper electrode and the lower electrode are electrically connected and the signal is sent to the main body via the connector, and is further attached to the main body. The information is input to a processing device such as a computer, which receives the input and performs a predetermined process, and the results are displayed on the display screen as dot symbols, patterns, etc. The shield plate of the touch panel is formed by forming transparent electrodes on a transparent sheet, and functions to prevent noise and static electricity from being generated on the display surface.

By the way, in conventional touch panels of this type, the connector that connects the external leads of the upper and lower electrodes to the main body also serves as a ground relay point for the shield plate, and the shield plate is connected to the main body via the connector. It is configured to be connected to the ground part on the side. Therefore, if this connector is not connected to the main body, no shielding effect will be obtained, and noise will occur on the display surface and dust will easily adhere to it, making it difficult to ensure that the shield plate functions properly. , it was hard to say that it was a desirable configuration.

[Purpose of invention]

The present invention was devised in view of the problems of the prior art described above, and its purpose is to provide a grounding structure for a touch panel that allows the shield plate to function at all times.

[Summary of the idea]

In order to achieve this purpose, the present invention covers the ends of the shield plate with conductive tape, and
The device is characterized in that the conductive tape is brought into contact with the ground portion of the main body.

[Example of idea]

Embodiments of the present invention will be described below with reference to the drawings.

Figures 1 and 2 relate to an embodiment of the present invention, in which Figure 1 is a schematic sectional view showing the positional relationship between the touch panel and the display surface, and Figure 2 is an enlarged sectional view of the main part showing the mounting part of the touch panel. It is.

In FIG. 1, reference numeral 1 is the main body of the CRT display (hereinafter referred to as the main body), and the main body 1
The curved display surface 1a of the CRT provided in the display has a substantially rectangular shape when viewed from the front.
A transparent touch panel 2, which is slightly wider than the display surface 1a, is installed on the front surface of the display screen 1a. This touch panel 2 has mounting holes at the four corners, and screws are inserted into the mounting holes to attach it to the chassis 1b, which is the ground portion of the main body 1 side. Furthermore, frames 3 are provided on the four sides of the touch panel 2.

This touch panel 2, as shown in FIG.
From the top surface to the bottom surface, the switch device 4,
The holding plate 5 and the shield plate 6 are generally constructed by laminating one after another.

The switch device 4 includes an upper electrode 7 formed by providing a large number of transparent electrodes 7a on the lower surface of a flexible transparent sheet, and a spacer 8 formed by providing a large number of through holes 8a at predetermined positions of the transparent sheet. It consists of a lower electrode 9 in which a large number of transparent electrodes 9a are provided on the upper surface of a transparent sheet, and by pressing a desired position on the upper surface of the upper electrode 7 with a fingertip or a pointer such as a pen, the upper and lower electrodes can be separated. Each transparent electrode 7 of electrodes 7 and 9
a and 9a are electrically connected, and the signal is sent to the main body 1 via a connector (not shown). Furthermore, mounting holes 4a are bored at the four corners of this switch device 4.

The holding plate 5 is a transparent plate made of acrylic or the like, and holds the switch device 4, and has mounting holes 5a bored in its four corners at positions corresponding to the mounting holes 4a.

The shield plate 6 is formed by forming transparent electrodes 6b by vapor deposition or the like on a transparent sheet 6a such as a polyester film, and has the mounting holes 4 in the four corners of the shield plate 6.
Attachment holes 6c are drilled at positions corresponding to a and 5a, and copper tape 10 is applied across both sides of the shield plate 6. Further, a silver pattern 6d is formed on the transparent electrode 6b of the shield plate 6 at a portion facing the copper tape 10, and the silver pattern 6d ensures a reliable electrical connection between the transparent electrode 6b and the copper tape 10. It has become a thing.

The laminate of the switch device 4, holding plate 5, and shield plate 6 is bonded and integrated with transparent full-surface laminated double-sided tapes 11 and 12.
It constitutes the touch panel 2. In addition, each mounting hole 4d, 5a, 6c, etc. of the touch panel 2 has screws 1.
3 are inserted through the screws 13, and the four corners of the touch panel 2 are attached to the chassis 1b of the main body 1. In other words, the touch panel 2 has the lower surface of the shield plate 6 facing the display surface 1a of the CRT,
In addition, the copper tape 10 is placed in front of the display surface 1a with the copper tape 10 in contact with the chassis 1b, which is the ground portion of the main body 1 side.

In the touch panel 2 having the above structure, the transparent electrode 6b and the chassis 1b are electrically connected via the copper tape 10 attached to the end of the shield plate 6, so that the ground of the shield plate 6 is directly connected to the chassis 1b. Since the shield plate 6 is connected to the ground part on the side of the main body 1, it is always functioning, and since the shield plate 6 is provided close to the display surface 1a of the CRT, it ends up preventing noise from the display surface 1a. The generation of static electricity is always reliably prevented by the shield plate 6.

FIG. 3 is an enlarged sectional view of main parts showing another embodiment of the present invention, and is an example in which the present invention is applied to a touch panel 2 in which the switch device 4 and the retaining plate 5 are not provided with mounting holes. It is.

In this embodiment, the shield plate 6 is slightly wider than the switch device 4 and the holding plate 5, and a step is formed at the end of the touch panel 2. The touch panel 2 is mounted using a mounting bracket 14 having a shape that matches this step. It is attached to chassis 1b. That is, the mounting brackets 14 are applied to the four corners of the touch panel 2 via the cushion members 15, and the shield plate 6 is fixed to the chassis 1b with the screws 13, and the entire touch panel 2 is placed between the mounting brackets 14 and the chassis 1b. It's being held in place. Also in this embodiment, a copper tape 10 is attached to the end of the shield plate 6, and the electrical connection between the transparent electrode 6b and the chassis 1b is maintained via the copper tape 10. Therefore, the ground of the shield plate 6 is directly taken out to the ground portion of the main body 1 side.

In each of the above embodiments, it has been explained that the four corners of the touch panel 2 are attached to the chassis 1b, but the attachment positions are not limited to the four corners, and may be, for example, at the center of each of the four sides. It is not limited to one location.

[Effect of idea]

As explained above, according to the present invention, a conductive tape is attached to the end of the shield plate, and the conductive tape is brought into contact with the ground portion of the main body, so that the ground of the shield plate is connected to the connector, etc. The screen is taken out directly to the main body without going through the screen, so the shield plate is always functioning, ensuring reliable measures against noise and static electricity on the display surface.

[Brief explanation of the drawing]

Figures 1 and 2 relate to an embodiment of the present invention, with Figure 1 being a schematic sectional view showing the positional relationship between the touch panel and the display surface, and Figure 2 being an enlarged sectional view of the main parts showing the mounting portion of the touch panel. and FIG. 3 is an enlarged sectional view of a main part showing an attachment part of a touch panel according to another embodiment of the present invention. 1... Main body (CRT display), 1a... Display surface, 1b... Chassis (ground part), 2...
Touch panel, 5... Holding plate, 6... Shield plate, 6b... Transparent electrode, 7... Upper electrode, 8...
Spacer, 9...lower electrode, 10...copper tape (conductive tape).

Claims (1)

[Scope of utility model registration request] An upper electrode and a lower electrode facing each other with a spacer interposed therebetween, a holding plate for holding these, and a shield plate provided with a transparent electrode are sequentially laminated, and the shield plate is placed on the display surface provided on the main body. In the touch panel that is placed in front of the display surface facing each other, a conductive tape is applied to the end of the shield plate, and the conductive tape is brought into contact with a ground portion on the main body side. Grounding structure for the touch panel.