Position determination device

• US 4,677,259 A
• Filed: 03/31/1986
• Issued: 06/30/1987
• Est. Priority Date: 03/29/1985
• Status: Expired due to Term

• Current Assignee: Pentel Kabushiki Kaisha
• Original Assignee: Pentel Kabushiki Kaisha
• Inventors: Abe, Kiyomi
• Primary Examiner(s): SCHREYER, STAFFORD
• Application Number:
  US06/846,569
• Time in Patent Office: 456 Days
• Field of Search: 178/18, 178/19, 178/20, 340/206, 340/209, 340/711, 29/825, 29/829, 29/846, 174/68.5, 428/901, 361/404, 361/409, 361/416
• US Class Current: 178/18.03
• CPC Class Codes: G06F 3/046 by electromagnetic means
• CPC Class Codes: Y10T 29/49124 On flat or curved insulated base, e.g., printed circuit, etc.

Abstract

A data tablet has an electrode matrix that includes two sets of electrodes, the sets of electrodes being arranged along coordinate axes on opposite sides of an intermediate insulating layer in such a way that the electrodes in one set are orthogonal to the electrodes in the other set. The electrodes of each of said sets constituting a first group and a second group, the electrodes in said first group being connected respectively to leading lines arranged in the same plane as of said electrodes in said first group, and the electrodes in said second group being connected via through-holes formed in said intermediate insulating layer respectively to other leader lines arranged in the same plane as of said electrodes of the other set.

The data tablet can be produced by forming a first circuit pattern on a substrate of an electrical insulating material by printing, then printing an insulating pattern on the substrate thereby forming the intermediate insulating layer overlaid on the first circuit pattern, and printing a second circuit pattern on the intermediate insulating layer. When the second circuit pattern is printed, the parts of said pattern on the apertures in the intermediate insulating layer overlie the first circuit pattern under the intermediate insulating layer.

Claims

1. A method of producing a data tablet including two sets of electrodes that are arranged along coordinate axes orthogonally, the electrodes of each set being divided into a first group and a second group, which method comprises the following steps:

a. preparing a substrate of an electrically insulating material,

b. forming a first circuit pattern on said substrate, the first circuit pattern including the electrodes of one of said sets, leader lines for the electrodes of the first group of said one set, and leader lines for the electrodes of the second group of the other set,

c. forming an insulating pattern on said substrate by printing so as to form an intermediate insulating layer that will overlie said first circuit pattern, said insulating pattern including apertures for electrically connecting the electrodes of said second groups of said sets to the leader lines related thereto, and

d. forming a second circuit pattern on said intermediate insulating layer by printing, said second circuit pattern including the electrodes of said other set, leader lines for said electrodes of the first group of said other set, and leader lines for the electrodes of the second group of said one set,

and in which method when said second circuit pattern is printed, parts of said second circuit pattern positioned over said apertures of said insulating pattern forming said intermediate insulating layer are overlaid on parts of said first circuit pattern under the intermediate insulating layer thereby connecting said first and second mentioned parts electrically.

2. A method of producing a data tablet according to claim 1, characterised in that said first circuit pattern and said second circuit pattern are made of an electrically conductive ink containing an electrically conductive material selected from carbon and silver powder and a phenolic type resin.

3. A method of producing a data tablet according to claim 1, characterized in that said insulating pattern is made of a bismaleimide triazine resin.

4. A data tablet, characterized in that it has an electrode matrix that includes two sets of electrodes, the sets of electrodes being arranged along coordinate axes on opposite sides of an intermediate insulating layer in such a way that the electrodes in one set are orthogonal to the electrodes in the other set, the electrodes of each of said sets constituting a first group and a second group, the electrodes in said first group being connected respectively to leading lines arranged in the same plane as of said electrodes in said first group, and the electrodes in said second group being connected via through-holes formed in said intermediate insulating layer respectively to other leader lines arranged in the same plane as of said electrodes of the other set.

5. A data tablet according to claim 4, characterised in that said intermediate insulating layer is made of a bismaleimide triazine resin.