JPH039059Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention inputs pattern information consisting of figures, characters, coordinates, etc. by sequentially pressing desired positions on a tablet with a pen, finger, etc. This invention relates to a tablet for inputting pattern information.

[Conventional technology]

Conventionally, this type of graphic input tablet has a structure in which a drawing sheet on the front side and a sheet on the main body side face each other, and a conductive film for electrically detecting coordinate positions is installed inside both sheets. is set up.

In such a structure, both sheets are fixed at a predetermined distance, and a double-sided adhesive tape or the like is used for the fixing in a portion other than the input range between the two sheets.

FIG. 3 shows a cross-sectional view of a conventional signal line facing type. That is, the drawing sheet 11 on the front side and the main body sheet 12 on the back side face each other with a predetermined distance therebetween, and position detection conductors 13, 14 are integrally formed. An adhesive layer 15 is provided near the periphery between both sheets 11 and 12, and both sheets 11 and 12 are bonded together by this adhesive layer 15.

In the figure input tablet configured in this way, by pressing a desired position on the drawing sheet 11 with a pen or finger, the position detection conductors 13 and 14 of both sheets 11 and 12 corresponding to the pressed position are detected. Contact. As a result, the contact position detection conductor 13,
14 is electrically detected, and the pressed position is recognized as a two-dimensional coordinate position signal.

However, in tablets with this type of structure, in order to reduce the pressing force as much as possible when inputting pattern information such as figures, characters, coordinates, etc.
It is preferable to narrow the distance between the sheets 11 and 12 to about 0.05 to 1.00 mm. If even a very small conductive foreign object exists between the sheets 11 and 12 with such a narrow interval, the foreign object may cause the sheets 11 and 12 to
The twelve position detection conductors 13 and 14 become electrically connected, and the incorrect coordinate data remains input. Such foreign matter cannot be removed, and the tablet itself becomes a defective product.

In most cases, the conductive foreign matter adheres to the adhesive layer 15 when the tablet is assembled. That is, since the adhesive layer 15 has adhesive properties during assembly, foreign matter is very likely to adhere to it.
Foreign matter attached to the inner edge of the position detection conductor 13,
14 becomes conductive. In this way, foreign substances that adhere to the adhesive layer 15 include those that themselves have conductivity, such as metal powder or carbon powder;
Alternatively, some materials, such as fibers, become conductive when they absorb moisture.

[Problem that the invention attempts to solve]

The present invention was developed in view of the above-mentioned conventional problems, and even if assembly is performed with conductive foreign matter attached to the adhesive layer, the foreign matter can be used to detect the position of both sheets. It is an object of the present invention to provide a tablet for inputting pattern information configured so that conductors do not become conductive.

[Means for solving problems]

In the present invention, an insulating film is provided between the edge of the adhesive layer and at least one of the sheets to prevent the conductive films of both sheets from becoming electrically conductive due to foreign matter. has been achieved.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In FIGS. 1 and 2, the reference number 1 is
This is a drawing sheet on the front side that is pressed with a pen or a guide to input pattern information consisting of figures, characters, coordinates, etc. A large number of signal lines 3 are integrally formed on one surface of this drawing sheet over almost the entire surface. These signal lines 3 are formed by etching or the like, and are arranged parallel to each other along the first direction. Further, a back main body sheet 2 is disposed at a position facing the surface of the drawing sheet 1 on which the signal lines 3 are formed. Similar to the drawing sheet 1, a large number of signal lines 4 are integrally formed on the surface of the main body sheet 2 facing the drawing sheet 1 over substantially the entire surface thereof. These signal lines 4 are also formed by etching or the like, and are arranged parallel to each other along a second direction orthogonal to the first direction.

In this way, the drawing sheet 1 and the main body sheet 2 are arranged facing each other with the signal lines 3 and 4 facing each other.
These two sheets 1 and 2 are bonded together with an insulating adhesive layer 5 disposed between them to be integrated. The adhesive layer 5 is made of double-sided tape or a liquid adhesive that hardens after a predetermined period of time, and is provided near the periphery of the drawing sheet 1 and the main sheet 2.

An insulating coating 6 is provided between the vicinity of the inner edge of the adhesive layer 5 and the main body sheet 2. This insulating coating 6 can be made of epoxy resin, urethane resin, polyester resin, silicone resin, etc., but it is preferably made of a material that has some degree of elasticity in order to provide flexibility between the sheets 1 and 2. Further, the thickness of the insulating film 6 is preferably set to be as thin as possible as long as the insulation property is maintained, and specifically, it is set to about 0.01 to 1.00 mm, and the width is set to about 1.00 to 10.00 mm in order to widen the information input range as much as possible. mm
It is set to about. The procedure for assembling the tablet constructed as described above is as follows: First, the insulating coating 6 is fixed at a predetermined position on the main body sheet 2 by means such as printing or coating with an insulating paint, or pasting with an insulating tape. Next, after disposing an adhesive layer 5 at a predetermined position on the main body sheet 2, the drawing sheet 1 and the main body sheet 2 are integrated via this adhesive layer 5. By assembling in such a procedure, it is possible to accurately set the mutual positional relationship of each member.

As mentioned above, drawing sheet 1 and main sheet 2
are opposed to each other with an interval of approximately 0.05 to 1.00 mm between the adhesive layer 5 and the insulating coating 6 near the periphery, and in the unlikely event that the adhesive layer 5 is assembled with conductive foreign matter attached to it. Even if this foreign matter occurs, the signal lines 3 and 4 of both sheets 1 and 2 will not become conductive.

That is, when a conductive foreign substance adheres to the inner edge of the adhesive layer 5, this foreign substance contacts the signal line 3 of the drawing sheet 1, but due to the presence of the insulating coating 6, the signal line of the main sheet 2 No contact with 4.

Pulse signals are sequentially supplied to each signal line 3 of the drawing sheet 1 in the tablet constructed as described above based on a clock signal. When a desired position on the drawing sheet 1 is pressed with a pen, a finger, etc., the signal line 3 of the drawing sheet 1 corresponding to the pressed position and the signal line 4 of the main sheet 2 come into contact and become electrically conductive. As a result, the recognition circuit that does not illuminate causes the main body sheet 2 to output a pulse signal due to the conduction.
The signal line 4 of the drawing sheet 1 and the signal line 3 of the drawing sheet 1 to which the pulse signal was supplied at the time of this output are detected, and the pressed position is recognized as a two-dimensional coordinate position signal.

In the above embodiments, the signal line facing method is exemplified, but it can be similarly adopted to the conventionally known resistive film facing method, resistive film and conductor film facing method, etc.
Furthermore, although the insulating coating 6 is provided only near the inner edge of the adhesive layer 5, it may also be provided near the outer edge of the adhesive layer 5. In addition, although the insulating film 6 is arranged between the vicinity of the edge of the adhesive layer 5 and the main sheet 2, it is provided between the vicinity of the edge of the adhesive layer 5 and the drawing sheet 1. It is also possible to arrange it in between. Furthermore, drawing sheet 1
The configuration of the signal lines 3 and 4 formed on the main body sheet 2 and the method of recognizing the pressed position by a pen, finger, etc. are not limited to the above embodiments, and other configurations and methods can be adopted. .

[Effect of idea]

As described above, the present invention has a structure in which an insulating coating is provided between the vicinity of the edge of the adhesive layer and the drawing sheet or main body sheet. Therefore,
Even if assembly is performed with a conductive foreign substance attached to the adhesive layer, the foreign substance will not cause conduction between the position detection conductor of the drawing sheet and the position detection conductor of the main body sheet. This has the effect that the incidence of tablet defects is extremely low.

[Brief explanation of drawings]

1 and 2 show an embodiment of the tablet for inputting pattern information according to the present invention.
The figure is a partially omitted sectional view, FIG. 2 is an overall exploded perspective view, and FIG. 3 is a partially omitted sectional view showing a conventional example. In the drawings, 1... Drawing sheet, 2... Main body sheet, 3, 4... Signal line, 5... Adhesive layer, 6...
Insulating coating.

Claims (1)

[Scope of utility model registration request] a pair of sheets that face each other at a predetermined distance and whose position can be detected; an adhesive layer disposed on the periphery between these sheets to integrate both sheets; and an inner periphery of the adhesive layer and the A tablet for inputting pattern information, characterized in that it is formed of an insulating coating disposed between at least one of the opposing sheets.