Electronic pen having an ultrasonic wave controller

An electronic pen comprising:

• a housing comprising a longitudinal axis and a write side tip along said longitudinal axis;
• at least an ultrasonic wave transmitter, said ultrasonic wave transmitter being arranged near said write side tip of said housing;
• and
• a controller for detecting a sensor orientation and for controlling a transmission of an ultrasonic wave,
• wherein the sensor orientation comprises a rotational orientation of said housing about said longitudinal axis, said rotational orientation indicating a predetermined direction towards an ultrasonic wave sensor for receiving the ultrasonic wave that is transmitted from said ultrasonic wave transmitter,
• wherein said controller selectively activates a part of said ultrasonic wave transmitter such that the ultrasonic wave is transmitted from a part of said ultrasonic wave transmitter which is directed to said sensor orientation,
• wherein said ultrasonic wave transmitter is arranged to surround said longitudinal axis of said housing, and
• wherein said controller comprises:
• a sensor detecting section for detecting said sensor orientation;
• and
• an ultrasonic wave limiter for limiting an operation of a part of said ultrasonic wave transmitter, wherein the part is positioned at an orientation that is relatively away from said sensor orientation, wherein said sensor orientation is detected by said sensor detecting section.

An electronic pen comprising:

• a housing comprising a longitudinal axis and a write side tip along said longitudinal axis;
• at least an ultrasonic wave transmitter, said ultrasonic wave transmitter being arranged near said write side tip of said housing;
• and
• a controller for detecting a sensor orientation and for controlling a transmission of an ultrasonic wave,
• wherein the sensor orientation comprises a rotational orientation of said housing about said longitudinal axis, said rotational orientation indicating a predetermined direction towards an ultrasonic wave sensor for receiving the ultrasonic wave that is transmitted from said ultrasonic wave transmitter.
• wherein said controller selectively activates a part of said ultrasonic wave transmitter such that the ultrasonic wave is transmitted from a part of said ultrasonic wave transmitter which is directed to said sensor orientation,
• wherein said ultrasonic wave transmitter is arranged to surround said longitudinal axis of said housing, and
• wherein said controller comprises:
• a plurality of pressing bodies that are arranged around said ultrasonic wave transmitter at orientations that are different from each other;
• and
• supporting members for supporting said respective pressing bodies such that said pressing bodies are free to move in a vertically downward direction and that at least one of said pressing bodies presses said ultrasonic wave transmitter, wherein at least one of said pressing bodies is positioned near a vertically upward part of said write side tip.

An electronic pen comprising:

• a housing comprising a longitudinal axis and a write side tip along said longitudinal axis;
• at least an ultrasonic wave transmitter, said ultrasonic wave transmitter being arranged near said write side tip of said housing;
• a controller for detecting a sensor orientation and for controlling a transmission of an ultrasonic wave;
• and
• an infrared ray transmitter for transmitting an infrared ray in synchronization with a transmission of an ultrasonic wave that is transmitted by said ultrasonic wave transmitter,
• wherein the sensor orientation comprises a rotational orientation of said housing about said longitudinal axis, said rotational orientation indicating a predetermined direction towards an ultrasonic wave sensor for receiving the ultrasonic wave that is transmitted from said ultrasonic wave transmitter, and
• wherein said controller selectively activates a part of said ultrasonic wave transmitter such that the ultrasonic wave is transmitted from a part of said ultrasonic wave transmitter which is directed to said sensor orientation.