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Electronic blackboard and accessories such as writing tools
| Details |
Inventors: Murakami, Azuma; Aoki, Kazuo; Yamanami, Tsuguya; Tomofuji, Yoshiaki; Tanaka, Takeshi; Inashima, Satoshi; Funahashi, Takahiko; Chikami, Toshihide; Senda, Toshiaki;
Assignee: Wacom Co., Ltd. (Saitama, JP)
Primary Examiner: Schreyer; Stafford D.
Assistant Examiner:
Attorney, Agent or Firm: Lowe, Price, LeBlanc & Becker
A characteristic and the position of an implement with a tuned circuit having one of plural resonant frequencies are determined. AC energy at the plural different resonant frequencies is supplied to a two-coordinate direction coil arrangement of a position sensing tablet. The tuned circuit changes the current flowing in the coil arrangement at the implement resonant frequency. The current change is used to signal the implement position and characteristic. The implement may be an eraser for supplying a signal to an electronic display and for removing a mark from a surface of a visual display overlaying the tablet of the eraser. A housing includes a surface for erasing the marking and two tuned circuits each having a reactance positioned close to opposite edges of the erasing surface. Two switches, when activated, cause the tuned circuits to have different resonant frequencies. The switches are respectively activated when opposite eraser edges are being pushed against the display surface. The implement may also be one of a plurality of markers, each for a different color. Another display responds to the signals to display the position and colors of the markings and selectively remove markings from areas corresponding to the eraser position. |
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DETAILED DESCRIPTION A first object of the present invention is to provide an electronic blackboard apparatus capable of using a cordless accessary such as an instruction rod, a marker, or an eraser (called a "writing tool" hereinafter in this specification), obtaining realtime image information which corresponds to the image formed on the writing surface, and exhibiting a thin structure and light weight.
In accordance with one aspect of the invention, an electronic blackboard apparatus comprises a writing surface, in combination with a tool for modifying an image on the surface, wherein the tool includes a tuned circuit having a predetermined resonant frequency.
A sensor for an electric wave having plural frequencies, one of which is the resonant frequency, and an electrical wave detector for an electric wave reflected by the tuned circuit is provided.
The sensor includes coordinate detection means responsive to the electric waves reflected from the tool and generated by the generating means for detecting a coordinate corresponding to the position of the tool.
Image information processing means processes, on the basis of the thus-detected coordinate, image information corresponding to an image formed by the tool on the surface.
Another aspect of the invention is directed to the combination of a position sensing tablet a two coordinate direction coil arrangement, a two coordinate direction display superposed with the tablet, a marker for the display and an eraser for the display.
The marker and eraser each include a tuned circuit respectively having first and second resonant frequencies.
AC energy is supplied at the first and second resonant frequencies to the coil arrangement.
The tuned circuits on the marker and the eraser, when the marker or eraser is placed in proximity to the tablet and coil arrangement, respectively cause changes in currents flowing in the coil arrangement at the first and second frequencies.
The changes in the current flowing in the coil arrangement at the first and second frequencies are sensed
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