Patent ID: 8053996

Claim:
A light emitting device comprising: an oscillation circuit for generating a pulse signal with a predetermined cycle by an application of a power supply voltage; a frequency dividing circuit for dividing the pulse signal generated by the oscillation circuit to generate a plurality of divided signals; a counting circuit for counting a first divided signal of the plurality of divided signals to determine a count value as information representing a time during the application of the power supply; a memory circuit for storing the count value determined by the counting circuit with the predetermined cycle; a switching circuit for reading out the count value from the memory circuit, and for generating a signal pattern synchronized with a second divided signal of the plurality of divided signals generated by the frequency dividing circuit based on the count value read out, to switch the power supply voltage based on the signal pattern generated; and a light emitter for emitting a light signal with the signal pattern generated by the switching circuit, wherein the light signal encodes the information representing the time during the application of the power supply.