Wacom Co., Ltd.

Novel Crystal Technology, Inc.

Kazuo Aoki

Azuma Murakami

Tsuguya Yamanami

Takahiko Funahashi

Toshiaki Senda

Toshihide Chikami

Satoshi Inashima

Yoshiaki Tomofuji

Akio Kikuchi

Takeshi Tanaka

Nobuyuki Miyamori

Keiichi Siguyama

Manabu Abe

Yuki Uchida

Tadashi Kase

Shigenobu Yamakoshi

A field-effect transistor includes a GaO-based semiconductor layer, a source region and a drain region that are formed inside the GaO-based semiconductor layer, a gate electrode that is formed, via a gate insulating film, on a channel region as the GaO-based semiconductor layer between the source region and the drain region, a source electrode connected to the source region, and a drain electrode connected to the drain region. An interface charge including a negative charge is formed between the gate electrode and the channel region, and a gate threshold voltage is not less than 4.5V.

Field-effect transistor and method for designing same

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.

Electronic blackboard and accessories such as writing tools

The position on a surface of an implement including a tuned circuit with a predetermined resonant frequency is determined and displayed by an apparatus having a housing including the surface. A tablet in the housing includes coils arranged in two coordinate directions parallel to the surface. The coils are excited with AC energy having approximately the same frequency as the resonant frequency. The tuned circuit interacts with the AC energy to change the AC current flowing in the coils as a function of the implement on the tablet. An electronic two-coordinate direction display in the housing configured as a plate is superposed with and lies in a plane parallel to the tablet and the surface. The display responds to the change in AC current resulting from the interaction between the AC energy and the tuned circuit to indicate the position of the implement on the surface.

Position detecting device

Growing community of inventors

Saitama, Japan

Kazuo Aoki