Coordinate data input device and method of fabricating the same

• US 5,896,127 A
• Filed: 05/01/1997
• Issued: 04/20/1999
• Est. Priority Date: 05/14/1996
• Status: Expired due to Term

• Current Assignee: ALPS Electric Company Limited (Alps Alpine Co., Ltd.)
• Original Assignee: ALPS Electric Company Limited (Alps Alpine Co., Ltd.)
• Inventors: Yamada, Naoki, Hagiya, Ryuichi, Matsufusa, Hideto
• Primary Examiner(s): SHALWALA, BIPIN H
• Assistant Examiner(s): Osorio, Ricardo
• Application Number:
  US08/847,240
• Time in Patent Office: 719 Days
• Field of Search: 345/173, 345/174, 345/176-178, 178/18, 178/19, 178/20
• US Class Current: 345/173
• CPC Class Codes: H05K 1/0289 having a matrix lay-out, i.e. having selectively interconnectable sets of X-conductors and Y-conductors in different planes
• CPC Class Codes: H05K 2201/096 Vertically aligned vias, holes or stacked vias
• CPC Class Codes: H05K 2201/10151 Sensor
• CPC Class Codes: H05K 2203/0455 PTH for surface mount device [SMD], e.g. wherein solder flows through the PTH during mounting
• CPC Class Codes: H05K 3/321 by conductive adhesives
• CPC Class Codes: H05K 3/361 Assembling flexible printed circuits with other printed circuits

Abstract

A coordinate data input device is fabricated by stacking a sensing board having a film provided with a plurality of parallel x-electrodes on its front surface, a plurality of parallel y-electrodes extending perpendicularly to the first electrodes on its back surface, and through holes formed at one end of each electrodes, and a printed wiring board provided with a plurality of through holes at positions corresponding to the through holes formed in the film of the sensing board at the ends of the first and the second electrodes, and a circuitry formed on its back surface, for driving and controlling the first and the second electrodes of the sensing board. Conductive films are formed on the side surfaces of the through holes of the sensing board and those of the printed wiring board so as to electrically connect the first and the second electrodes of the sensing board to the circuitry of the printed wiring board.

Claims

1. A coordinate data input device comprising:

a sensing board having a film provided with a plurality of parallel first electrodes on its front surface, a plurality of parallel second electrodes extending perpendicularly to the first electrodes on its back surface, and through holes formed at one end of each of the first electrodes and at one end of each of the second electrodes;

a printed wiring board mounted with the sensing board, and provided with a plurality of through holes at positions corresponding to the through holes formed in the film of the sensing board at the ends of the first and the second electrodes, and a circuitry formed on its back surface, for driving and controlling the first and the second electrodes of the sensing board; and

conductive films formed on the side surfaces of the through holes of the sensing board and those of the printed wiring board so as to electrically connect the first and the second electrodes of the sensing board to the circuitry of the printed wiring board.

2. A coordinate data input device according to claim 1, wherein the diameter of the through holes of the sensing board is greater than that of the through holes of the printed wiring board respectively corresponding to the former through holes.

3. A coordinate data input device according to claim 1, wherein the through holes each formed at one end of each first electrode and the through holes each formed at one end of each second electrode are formed continuously in a slit of a planar shape substantially resembling the letter L.

4. A coordinate data input device according to claim 2, wherein the through holes each formed at one end of each first electrode and the through holes each formed at one end of each second electrode are formed continuously in a slit of a planar shape substantially resembling the letter L.