Telegraphy – Systems – Position coordinate determination for writing
Patent
1993-12-22
1995-08-08
Chin, Stephen
Telegraphy
Systems
Position coordinate determination for writing
G08C 2100
Patent
active
054400805
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an information input device, and more specifically to an information input device comprising an input pen as a coordinate indication means, a tablet comprising a transparent coordinate input board for placing the input pen in contact and a coordinate detection board for detecting a coordinate with which the input pen contacts, a display unit for placing the tablet thereon, and an arithmetic portion for calculating the contact coordinate of the input pen with the transparent input board, in which an operational property at the time of contact of the input pen with the transparent coordinate input board is excellent and a display of the display unit is readily visible even through the transparent coordinate input board.
BACKGROUND OF THE INVENTION
An information input device has been heretofore known which comprises a combination of an input pen as a coordinate indication means, a tablet comprising a transparent coordinate input board for placing the input pen in contact and a coordinate detection board for detecting a coordinate with which the input pen contacts by an electrostatic capacity coupling system or an electromagnetic induction system, a CRT for placing the tablet thereon, a display unit such as a liquid crystal display unit, and an arithmetic portion for calculating the contact coordinate of the input pen with the transparent coordinate input board. According to the aforementioned device, a nib of the input pen is placed in contact with the surface of the transparent coordinate input board (that is, a coordinate input surface) to thereby detect a signal of the coordinate detection board, a contact position of the input pen with the coordinate input board is calculated from the thus detected signal and then outputted to a host computer.
In the above-described information input device, the nib of the input pen is normally formed of a conductive material such as stainless steel iron or the like. On the other hand, it is also known that the tip portion of the nib is coated with a high polymer molecule in order to prevent the coordinate input surface with which the nib contacts from being scratched, to satisfy the electrostatic pressure resistance, and to enhance a touch (a so-called writing feeling) at the time of contact of the nib of the input pen with the coordinate input surface as disclosed in Japanese Patent Application Laid-Open No. 61-183727.
Further, in the aforementioned device, the tablet comprises the transparent coordinate input board and the coordinate detection board. The transparent coordinate input board is generally made of glass in consideration of transparency and strength, but may be formed from a plastic plate or one obtained by sticking a plastic film or the like to glass. Further, there is also known a tablet having a coordinate input surface subjected to nonglaring treatment in order to enhance the visibility of characters or figures displayed on the display unit.
In the case where the tablet is placed on the display unit, not only the coordinate input board but also the coordinate detection board need be transparent. In this case, use is made of the coordinate detection board in which a plurality of transparent electrode wires in directions of axes X and Y are arranged on a transparent substrate. The transparent electrode wires are formed of indium oxide (hereinafter referred to ITO) and tin oxide, and the transparent substrate is made of glass or the like (see FIG. 2). It is to be noted that when the tablet is used in such a manner as described, the coordinate input board is often made integral with the coordinate detection board.
It is further known that a display unit such as a liquid crystal is arranged under a transparent coordinate input board of the tablet and a coordinate detection board is arranged under the display unit (see FIG. 3).
However, the nib having its tip portion merely coated with an organic high polymer molecule as in the above-described input pen has a problem in that particularly when the nip
REFERENCES:
patent: 4613793 (1986-09-01), Ponicker et al.
patent: 4943689 (1990-07-01), Seifer et al.
patent: 5136404 (1992-08-01), Nosile et al.
Nagaoka Makoto
Sugiyama Tetsuya
Chin Stephen
Loomis Paul
Pentel Kabushiki Kaisha
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