Patent ID: 7663874

Claim:
An electronic apparatus comprising: a first enclosure; a second enclosure coupled to the first enclosure for relative rotation around a rotation axis intersecting with a surface of the first enclosure, the second enclosure rotating around the rotation axis in a first direction and a second direction, opposite to the first direction, from a reference attitude; a rotation restriction mechanism configured to terminate rotation of the second enclosure in the first direction from the reference attitude at a first rotation angle equal to at least 180 degrees from the reference attitude, thereby establishing a first attitude of the second enclosure, the rotation restriction mechanism being configured to terminate the rotation of the second enclosure in the second direction from the reference attitude at a second rotation angle equal to at least 180 degrees from the reference attitude, thereby establishing a second attitude of the second enclosure; an element configured to rotate around the rotation axis along with the second enclosure; a sensor configured to output a first signal in response to detection of action of the element in the first direction and a second signal in response to detection of action of the element in the second direction; and a displaying unit configured to indicate one of the first direction and the second direction in response to the first signal when the second enclosure takes the first attitude, the displaying unit configured to indicate another of the first direction and the second direction in response to the second signal when the second enclosure takes the second attitude.