JPS58222388A - Device for indicating digital coordinate - Google Patents

Abstract

PURPOSE:To use the titled device for a curved surface such as a conventional CKT, by inserting a spacer to a couple of transparent conductive films so that the column of the conductive piece are opposed crossingly and a gap is provided between both films. CONSTITUTION:A digital patch panel 1 consists mainly of the transparent conductive films 2, 3 and the spacer 4. The front side film 2 is made of a polyethylene telephthalate resin base layer 9 and a gold thin film layer 10 forming conductive face pieces 10a-10d and leads 5a-5d are adhered incorporatedly to the circumference of one end of the conductive face pieces. Further, the rear side film 3 comprises a polyethylene telephthalate resin base layer 11 and a gold thin film layer 12 forming conductive surface pieces 12a-12d. Further, 7a-7d are leads. The spacer 4 is inserted so that the conductive surfaces are opposed at the circumference of both films 2, 3. Thus, the device is used for a curved surface such as a conventional CKT.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for indicating digital coordinates, and in particular to a device for indicating digital coordinates on various surfaces such as curved surfaces such as the surface of a cathode ray tube of a television, which is most commonly used as a means for projecting various images, and flat surfaces. The present invention provides a device for instructing.

Conventionally, as a device for indicating coordinates on a certain plane, a flat transparent conductive film (7 lexicules) and a hard substrate are placed parallel to each other with the conductive surfaces facing each other with a slight gap between them. It is known that a film and a substrate are provided with conductive surfaces and electrodes that can conduct electricity. This device is installed, for example, on a flat surface on which an image is projected, and the point on the flexible transparent conductive film (front film) that corresponds to a specific point in the image for which you want to know the position (coordinates) is pointed with the tip of a pen. By pressing (touching), coordinate signals can be seen from between both electrodes. However, this device could only indicate coordinates on flat surfaces, and could not be used on curved surfaces such as the surface of a television cathode ray tube, which is the most common means of displaying various types of images.

On the other hand, a method in which a transparent hard conductive substrate is formed into a curved surface in advance has been proposed (see Japanese Patent Laid-Open No. 58-64775). However, this configuration could only be used for specific curved surfaces and lacked versatility.

The present invention has been made in view of these circumstances, and its specific configuration is to use a pair of 7-lexiple transparent conductive films in which conductive face pieces are arranged in parallel rows with intervals. so that the rows of surface pieces intersect and face each other, and a gap is maintained between both films unless pressed.
It is a device that indicates dream digital coordinates fixed through spacers provided on the four sides.

That is, the present invention uses a flexible transparent conductive film in place of the above-mentioned transparent hard conductive substrate, so that it can be used not only on one curved surface but also on various curved or This also makes it possible to specify the digital coordinates of a plane.

In this invention, a pair of 7-Lexiglu transparent conductive films are used, but when the front film is touched with a pen etc., only the touched part becomes inward, and when the touch is stopped, it returns to its original curved or flat shape. It is necessary to use a flexible material that can be used in a flexible manner, and specifically, it is desirable to use a film made of thermoplastic resin.

The film on one side can be made of a flexible film made of thermoplastic resin similar to the one on the front side so that it can correspond to various surfaces for which coordinates are to be determined.

A pair of such flexible transparent conductive films is
In both cases, conductive surface pieces are arranged in substantially parallel rows with intervals, and the rows are arranged so as to intersect and face each other.

However, for forming the conductive surface piece, a thin film layer of ductile gold, silver, iron, copper, etc., which does not break even when curved is preferred, and a thin film layer of molten gold is more preferred.
Furthermore, the surface of the thin film layer may be coated with plastic or the like to protect the thin film.

Of course, these conductive surfaces are used (optionally via electrodes) to output the signals necessary for digital coordinate determination.
Although it is desired to have an appropriate surface resistance, it is usually set to 1Ω/hole to IOKΩ/hole, preferably 1O to IKΩ/hole. Further, the distance between the conductive surface pieces arranged in a row is formed by etching or the like, and the distance dimension is appropriately set so that there is no fear of electrical short circuit.

Next, these pairs of conductive films are placed on a curved surface (
When processed (three-dimensional curved surface), both films are generally formed so that they are convex on the front side (the side that is touched with a pen or the like). Preferably, the convex curved surface is formed in the shape of (a part of) a substantially spherical surface for both films, and it is further preferable that the radius of curvature of the front film is set to be smaller than that of the inner film. This is because the center of the conductive film tends to approach closer than the set value due to various dimensional errors during manufacturing and deformation over time, and there is a risk that the signal that determines the digital coordinates cannot be obtained sufficiently. The purpose is to set the distance between the central portions to be large in advance.

The present invention will be described in detail based on the embodiments shown in the figures above.
Note that this invention is not limited to K.

First, in FIGS. 1 to 8, (1) is a digital touch panel as a device for indicating plane digital coordinates, and is mainly composed of a pair of flexible transparent conductive films (21+31) and a spacer (4).

゛ The transparent conductive film (2) on the front side consists of a polyethylene terephthalate resin base layer (91) and a conductive surface piece (1 oa
Xtob) (toe) (tod)..., and a gold thin film layer 00 forming Xtob) (toe) (tod)..., and lead wires (5a) (5bX5c) (
5d) -- are fixed together. On the other hand, the transparent conductive film (3) on the back side has the same structure as the front side, with a polyethylene terephthalate resin base layer 11 and a conductive surface piece (11
aX12bX12c) (12d) . . .

Note that (7a) (7bX7eX7d) --- are lead wires.

The spacer (4) is interposed around the four circumferences of both films (21+31) so that the conductive surfaces thereof face each other, and the two films are joined together using an adhesive.

Note that (R1) and (R2) are the radius of curvature of the h transparent conductive film (21+31), and (01) and (02) are the centers thereof.

The digital touch panel (1) configured as described above is installed exactly on the surface of, for example, a TV's cathode ray tube, and the transparent conductive panel on the front side of the panel (1) that corresponds to the point whose coordinates are to be known in the image projected on the cathode ray tube. Touch and hold the corresponding points on the transparent film (2), and touch the conductive surface piece of the film (2), e.g. (10c), and the conductive surface piece of the inner transparent conductive film (3), e.g. (12b). Make point contact with. In this contact state, when a DC voltage is applied to each of the lead wires (12a, (12b), (12cX12d), etc. in FIG. 1), a potential can be detected only in the lead wire (6c). That is, a digital signal at the Y coordinate corresponding to the lead wire □ (6c) can be detected. Then lead m (10aX10b)(10c)(
10d)... When a DC voltage is applied to each, a digital signal of the X coordinate corresponding to the lead wire (7b) can be detected.

Here, for reference, an example of the dimensional specifications of the digital Tarano panel (1) shown in FIGS. 1 to 8 will be given.

A) Transparent conductive film (2++31 polyethylene terephthalate resin layer +9+QO thickness ζ:Q
, Iff gold thin film layer 00 (c) (conductive surface piece) thickness: 2
00A surface resistance: 200/mouth curvature radius (R1): 550fiI
I (R2) 2600H opening) Spacer (4) Thickness: 1ffil1 Width: 9.5fl C) Overall external shape (rectangle) Maximum length: 82 cod (width = 56 cod)

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of a device for indicating digital coordinates of the present invention, FIG. 2 is a cross-sectional view taken along the line ■-■, and FIG. 8 is a cross-sectional view taken along the line l1l-III. (1)...Digital touch panel, (2)(31...
-Transparent conductive film, (4)...spacer.

Claims (1)

[Claims] 1. A pair of flexible transparent conductive films in which conductive surface pieces are arranged in substantially parallel rows with intervals, such that the rows of conductive surface pieces intersect and face each other, In addition, a device that indicates fixed digital coordinates via spacers provided around the four circumferences so that a gap is maintained between the two films unless pressed. 2. The device according to claim 1, wherein the pair of 7-lexiglu transparent conductive films are curved, and the curved surface is a part of a substantially spherical surface, and the outer shape is substantially rectangular. 8. The device according to claim 2, wherein the radius of curvature of the outer film is smaller than the radius of curvature of the film located inside the curved surface. 4. The device according to any one of claims 1 to 8, wherein each conductive face piece of the pair of flexible transparent conductive films is comprised of a thin film layer of a malleable material.