Patent ID: 8224187

Claim:
An electronic device having a first emission unit for emitting laser light and a first modulating unit for modulating the laser light emitted from the first emission unit according to transmission information, wherein the relative position of a casing of an opposing device and a casing of the electronic device are in an adjusted state to a communication enabled position in which the laser light emitted from the first emission unit is incident within a light receiving region of the opposing device, and the transmission information is received by a receiving unit of the opposing device by detecting the laser light incident in the light receiving region, and by demodulating the transmission information from the detection result of the laser light; the electronic device comprising: a first contact that contacts a second contact provided on the opposing device when the relative position of the casing of the opposing device and the casing of the electronic device is in the adjusted state to the communication enabled position; and a first electrical supply unit for supplying to the first emission unit as power for emitting the laser light power that has been supplied from the opposing device through the first contact in contact with the second contact, wherein one of the first contact or the second contact is a cylindrical shape, and the other is a ring shape so as to be contactable with the other cylindrical shaped electrical contact around the whole of the circumference of the electrical contact, and the first contact and the second contact are attached to the respective devices such that the periphery of a light path for the laser light emitted from the first emission unit is covered by contact of the electrical contact on the electronic device with the opposing contact when the relative position of the casing of the opposing device and the casing of the electronic device is in the adjusted state to the communication enabled position.