JPH01158519A - Substrate for detecting position - Google Patents

Abstract

PURPOSE:To prevent the danger of a bubble remaining when a substrate is stuck to an enclosure, to attain the work without anxiety, to shorten an assembling time and to improve a yield by applying directly adhesives to a substrate for detecting a position and providing a passage where the air runs away when the substrate for detecting a position is stuck, between adhesives. CONSTITUTION:For a substrate 1 for detecting a position, the necessary number of electrodes 3 and extension lines 4 is formed by a silk printing on a sheet 2 composed of a synthetic resin. An electrode is formed by a silk printing through an insulating layer onto the electrode 3 of the sheet 2 as shown in a broken line 5 even in a Y direction and even the extension line corresponding to this is formed and further, the whole is silk-printed with the insulating layer. The part corresponding to the part to form the electrodes 3 and 5 is made into a non-bonding part 7 and adhesives 6 are applied to the part corresponding to the part divided by the orthogonal line of electrodes 3 and 5. Thus, only by sticking the substrate for detecting the position, the air can be extracted from the non-bonding part as air extraction and the bubble does not remain.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a position detection substrate used in coordinate input devices, tablet input devices, and the like.

[Prior Art] In a coordinate input device or a tablet input device, a position detection board is attached to the housing thereof. There are various mounting methods, but
In particular, when attaching a position detection substrate whose material is in the form of a film and the required electrodes are formed using silk printing,
Attachment using a double-sided pressure-sensitive adhesive sheet, adhesive, or the like is used because the attachment is reliable and because the attachment surface can be simply flattened, making mold processing easier.

[Problems to be Solved by the Invention] However, with the above mounting method, air bubbles may form between the board and the case unless the board is carefully pressed from the center toward the periphery after aligning the case and the position detection board. There is a risk that the adhesive will remain, and if it fails, it cannot be reattached, so there is a risk that the substrate will be wasted, resulting in problems of poor workability and yield.

Therefore, the applicant of the present application proposed a position detection board in which the above-mentioned problem was solved by providing air vent holes at required locations on the board as U.S. Pat. No. 62-148955. In this way, the air would escape from the air vent hole and no air bubbles would remain even if it was simply pressed down after one positioning, but it would take a skilled worker to attach this position detection board to the casing. was necessary.

[Means for Solving the Problems] Accordingly, in the present invention, an adhesive is applied directly to the position detection substrate, and a path is provided between the adhesives through which air can escape when the position detection substrate is attached.

[Function] By doing so, air can be evacuated from the non-adhesive portion as an air vent by simply pasting the position detection substrate, and no air bubbles remain.

[Examples] The details of the present invention will be explained below based on illustrated examples. 1st
In the figure, reference numeral 1 is a position detection substrate according to the present invention, which is formed by forming a required number of electrodes 3 and leader lines 4 on a sheet 2 made of synthetic resin by silk printing. This embodiment relates to a capacitive coupling type coordinate input device, and in reality, electrodes are formed by silk printing on the electrodes 3 of the sheet 2 with an insulating layer interposed therebetween, as shown by the broken line 5 in the Y direction. A corresponding leader line is also formed (the leader line is not shown), and the entire surface is silk-printed with an insulating layer.

A portion corresponding to the portion where the electrodes 3 and 5 are formed is defined as a non-adhesive portion 7, and an adhesive 6 is applied to a portion corresponding to the portion divided by the orthogonal line between the electrodes 3 and 5. As the adhesive, a synthetic rubber-based solvent-type pressure-sensitive adhesive for screen printing is applied to a thickness of about 0.02 mm. The adhesive application interval is 4 to 6 nwn, and the width of the non-adhesive portion 7 is approximately 1 m. These electrodes 3, 5, lead wire 4
, a release paper is attached covering the adhesive 6, the non-adhesive portion 7, and the entire insulating layer. (Not shown) Here, the non-adhesive portions 7 intersect and communicate, and the ends tend to extend outside the area where the adhesive 6 is arranged.

Reference numeral 21 denotes an upper case serving as a housing of the coordinate input device.A partition line 22 indicating a coordinate input area is drawn on the upper surface of the upper case, and the lower surface is made flat for attaching the substrate 1. The upper case 21 is combined with a lower case (not shown) on which a control circuit and the like are mounted to form a completed product.

Although the figure shows it in an exploded form, the assembly of this embodiment is carried out in the following steps. First, the release paper (not shown) on the top surface of the position detection substrate 1 is peeled off, and the position detection substrate 1 is attached to the bottom surface of the upper case 21 . Here, position detection board 1
Since the adhesive 6 is adhered to the lower surface of the upper case 21 while peeling off the release paper, the adhesive 6 is separated from the non-adhesive part 7.
Since the air escapes, there is no risk of air bubbles remaining between the sheet 2 and the upper case 21.

Note that instead of the upper surface of the detection substrate 1, a non-adhesive portion may be left on the lower surface of the upper case 21 and an adhesive may be applied to the lower surface of the upper case 21 to bond them together. In this case as well, air escapes from the non-adhesive portions, so no air bubbles remain even if they are laminated together carelessly.

Furthermore, in this embodiment, the electrode 3.5 is formed for an electrostatic coupling method, but the present invention can be applied to an electromagnetic coupling method and other methods. It can also be applied to input devices and the like.

[Effects of the Invention] As described above, according to the present invention, when attaching a board to a casing, the work can be carried out with peace of mind without the risk of leaving bubbles, and therefore the assembly time can be shortened and the yield can be improved.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Coordinate detection board, 2... Sheet, 3.5.
...electrode, 6...adhesive, 7...non-adhesive part,
21... Upper case.

Claims (1)

[Claims] A position detection board that is pasted on a housing, characterized in that the pasting surface of the board is provided with an adhesive-applied part and a non-adhesive part that separates the applied adhesive from each other. A board for position detection.