Patent ID: 8391722

Claim:
A transmission device for transmitting a binary signal having a signal of high level and a signal of low level comprising: a light emitting element for converting an electric signal to an optical signal and transmitting the same; and a drive means for outputting the optical signal from the light emitting element and driving the light emitting element by providing the electric signal to the light emitting element; wherein the electric signal provided by the drive means to the light emitting element is a waveform deformed signal having a waveform in which a time required for a fall is longer than a time required for a rise in a binary signal having a signal of high level and a signal of low level, wherein the drive means includes a waveform deforming means for deforming the binary signal to the waveform deformed signal and providing to the light emitting element, wherein the drive means is a circuit including a current mirror circuit, and wherein a power supply voltage is applied to that in which the light emitting element and a transistor of the current mirror circuit are connected.