JPS62139222A - Input device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a high precision input device.

[Conventional technology]

Conventional devices of this type include two sets of parallel strips each having a predetermined interval on a substrate having electrodes having a constant resistance value, as shown in JP-A-59-13227 and JP-A-59-152,237. A first panel with electrode terminals arranged perpendicular to each other, and a second panel that has a sheet resistance that is the same as or different from that of the first panel and that is easily deformed in the direction perpendicular to the surface by applying an external force. The panels are pasted together via a plurality of insulating spacers with their electrode surfaces facing each other, and the contact positions of the first panel and the second panel are adjusted to the two sets of parallel electrode terminals at regular intervals. The configuration is such that determination is made based on the potentials obtained from the second panel when a voltage is applied.

[Problem that the invention seeks to solve]

However, in the above-mentioned conventional technology, when detecting the position of a pressed point on an input device with high precision, uniformity of electrodes having a certain resistance value and uniformity of two sets of parallel electrode terminals are required. However, in order to make the electrode uniform, it is necessary to make the film thickness completely constant, which is actually impossible in terms of manufacturing.

The present invention is intended to solve these problems, and its purpose is to make it possible to detect the position of the pressed point with high precision by correction even if the resistance of the electrode is not completely uniform immediately after manufacture. be.

[Means to solve the problem]

The input device of the present invention has electrodes formed almost uniformly on the surface,
A first substrate on which two sets of strip-shaped parallel electrode terminals having a sheet resistance smaller than that of the electrodes are provided to intersect with each other, and a flexible second substrate on which electrodes are formed are connected via a plurality of spacers. In the input device formed such that the electrodes face each other, cuts are made in the longitudinal direction in each set of electrode terminals on the first substrate, and the resistance value between the electrode terminals is changed by the cuts. It is characterized by:

[Effect]

The operation of the present invention will be explained in detail based on the drawings. 1st v
! 3 shows the basic structure of the present invention. Figure 1 (α)
In (b) lα) is a plan view, and C and h) are AA/cross-sectional views, an electrode 2 is formed on a substrate 5, and an electrode terminal 1 having a sheet resistance smaller than that of the electrode 2 is formed. Figure 2 (α) (b
) ((α) is a plan view, (h) is a side view), electrodes 6 are also formed on other substrates 7. As shown in 3rd vA, these are pasted together via a spacer 8 and a plurality of convex spacers 9 so that the electrodes face each other to form an input device. By making cuts 3 in the longitudinal direction of each electrode terminal, when voltage is sequentially applied in the X and Y directions, the voltage appearing on the electrode 2 has linearity in both the X and Y directions. be able to. This principle will be explained below.

In order to detect the X direction in the input device of the present invention, as shown in FIG. 4, the switch groups 10 and 10' are set to QFIF, and the switch groups 11 and 11' are turned on.

At this time, if the electrode 2 and the electrode terminal 1 are divided into several blocks as shown in FIG. 5, and the resistance values R0 to R0 of these blocks are completely equal, very high precision detection in the X direction is possible.

Further, when detecting the position in the Y direction, the switch groups 10 and 10' in FIG. At this time, electrode 2 and electrode terminal 1 are
If the resistance values U0/~R,/ of the blocks are considered to be divided into several blocks as shown in the figure and are completely equal, very high precision detection in the Y direction is possible.

Therefore, in order to achieve high precision in both the X and Y directions, the resistance values of blocks R6-'9eRO' to R, / shown in FIG. 6 may be made equal. In order to equalize the resistance values of R0 to R9, select the block with the maximum resistance value from Ro"""@ and make a cut 3 as shown in Figure 7 so that the other blocks have the same maximum resistance value. .The resistance value of each block changes depending on the location of this cut 3.H,
The same applies to I to R,/. The maximum resistance value may be measured by actually measuring the resistance value or by using a voltage drop.

As described above, by making the cut 5 in the electrode terminal 1, when a voltage is applied to the electrode terminal 1, the potential distribution appearing on the electrode 2 becomes extremely linear, allowing highly accurate position detection. .

〔Example〕

(Example 1) In Figures 1 to 3, 1.1 tm glass was used for the substrate 5, carbon paste was used for the electrode 2, and carbon paste was used for the electrode terminal 1.
Further, a 188 μm P] IfT film was used for the substrate 7, and TO was used for the electrode 6, and cuts 3 were made with a YAG laser. A spacer of several tens of microns was placed between the two difference plates, and spacers 8 made of sealing adhesive were placed on all four sides. The substrate size was approximately 1100×180, and the cut block of No. 7 Iil was calculated to be 20 mm in both the X direction and the X direction. Further, the laser spot diameter is 25μ. If the linearity error is defined as, then the 1.5% before correction is [lL5
%. This input device is 128x256 dots (
When installed on a liquid crystal display element with a dot pitch of 0.47 mm) and made to correspond to the dots, there was a deviation of 4 before correction and under suppression.
The dots became ±2 dots after correction (Example 2) In Example 1, the cut pitch was set to 5 in both the X and Y directions.
When the same correction was made using mm, the accuracy of the input device was better than that in Example 1, and the linearity error before correction was α9%.
The value of α was 3%.

(Example 3) When a large number of lead wires were drawn directly from the electrode without providing an electrode terminal, the linearity was not very good in the areas very close to the lead wires, but the linearity of other electrode parts was poor. could be corrected by cutting.

In Examples 1 to 3, the substrate may be transparent or opaque, and the same applies to the electrodes. Further, the electrode terminal may be anything as long as it has a smaller sheet resistance than the electrode.

A cutter or the like may be used instead of a laser to make the cuts.

〔Effect of the invention〕

As explained above, the present invention can correct errors in position detection caused by non-uniformity of electrodes on a substrate, and .

Highly accurate position detection is now possible.

Additionally, the difficult manufacturing process of uniformly forming electrodes on a substrate can be replaced with a method of making cuts using a laser or the like during the process, making it possible to provide highly accurate input devices.

[Brief explanation of drawings]

FIG. 1(α)(b), FIG. 2(α)(b), and FIG. 5 are basic structural diagrams of the input device of the present invention. 4 to 7 are diagrams showing the principle of the input device of the present invention. In the figure 1... Electrode terminal 22.6... Electrode 5... Cut 4... Output wire 5.7...・Substrate 8......Spacer 9...Convex spacer 10.10', 11.11'...Switch group and above Applicant: Seiko Epson Corporation R ( b) Figure 2 Figure 4

Claims (1)

[Claims] A first substrate, on which electrodes are formed almost uniformly on the surface, and two sets of strip-shaped parallel electrode terminals having a sheet resistance smaller than that of the electrodes are provided to intersect with each other, and a flexible substrate with electrodes formed on the surface. In an input device in which a second substrate is formed such that the electrodes face each other via a plurality of spacers, cuts are made in the longitudinal direction in each set of electrode terminals of the first substrate, and the cuts allow the electrodes to face each other. An input device characterized in that it is configured by changing a resistance value between terminals.