Patent ID: 7088924
Filing Date: 2006-08-08
Classification: H04B

Abstract:
1. A communication system, comprising: a transmitting apparatus for transmitting optical information in the form of a light beam dispersed in a spatially predetermined range formed by an array of a plurality of light emitting diodes corresponding to a number of bits of parallel input data, wherein a level of light emission from the plurality of light emitting diodes is in accordance with bit information of the parallel input data; a receiving apparatus including a light receiving element array having a plurality of light receiving elements arranged in an array for receiving the light beam and outputting a plurality of electric signals at levels corresponding to amounts of light received, wherein the light receiving elements output electric signals in parallel, and an information extraction circuit for receiving a plurality of electric signals output in parallel from the light receiving element array and extracting information in accordance with the optical information signal based on the plurality of electric signals, wherein the receiving apparatus comprises an optical system for condensing the light beam to a predetermined region of a light receiving region of the light receiving element array, and wherein the optical system is capable of adjusting a position of a light axis direction based on a control signal; and the information extraction circuit outputs the control signal for adjusting the position of the light axis direction to the optical system when information in accordance with the optical information cannot be extracted based on the plurality of electric signals, wherein said optical information includes a plurality of information corresponding to bits of a plurality of parallel data and is dispersed in a spatially predetermined range.