Abstract: Provided is a lighting tool for a vehicle including a first power supply, and a lamp for a vehicle operated with electric power supplied from the first power supply, a detection unit that detects a waveform of first electric power, a generation unit that generates a first control signal that is a signal controlling the lamp for a vehicle according to the waveform of the detected first electric power, an output control unit that superimposes the first control signal on the first electric power and wirelessly transmit the signal obtained by the superimposition from a power transmission section, a conversion unit that acquires a second control signal based on the signal received by a power receiving section that receives the signal wirelessly transmitted from the power transmission section, and a lamp control unit that controls the lamp for a vehicle according to the second control signal.

Abstract: Provided is a lighting tool for a vehicle including a first power supply, and a lamp for a vehicle operated with electric power supplied from the first power supply, a detection unit that detects a waveform of first electric power, a generation unit that generates a first control signal that is a signal controlling the lamp for a vehicle according to the waveform of the detected first electric power, an output control unit that superimposes the first control signal on the first electric power and wirelessly transmit the signal obtained by the superimposition from a power transmission section, a conversion unit that acquires a second control signal based on the signal received by a power receiving section that receives the signal wirelessly transmitted from the power transmission section, and a lamp control unit that controls the lamp for a vehicle according to the second control signal.

Abstract: To improve the accuracy of the outgoing light intensity of the light emitting element by performing pulse width modulation. A control device for controlling a light emitting element by performing pulse width modulation includes a DC-DC converter for supplying voltage to the light emitting element, a setting unit that sets a control value for the pulse width modulation in the DC-DC converter, a detection unit that detects an actual value of an ON time period which is a period during which the current flowing through the light emitting element is relatively high, and a correction unit for correcting the control value set by the setting unit so as to reduce the difference between an expected value of the ON time period corresponding to the control value and the actual value of the ON time period detected by the detection unit.