Vehicular lighting device
AssigneeKoito Manufacturing Co., Ltd.
InventorsTomoyuki ICHIKAWA, Masayasu ITO, Naoki TATARA, Satoshi Yamamura
Life of this patent
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Abstract
A first light source illuminates a first region. A second light source is configured to provide lower luminance than that of the first light source. The second light source illuminates a second region that overlaps the first region, and that has a larger area than that of the first region. A lighting circuit drives the first light source and the second light source according to a common lighting instruction. The lighting circuit gradually turns on the first light source and the second light source with different gradual changing time periods in response to the lighting instruction.
Claims7
-8. (canceled)
A vehicular lighting device comprising:
- a light source comprising a laser diode;
- and
- a lighting circuit structured to supply a driving current to the laser diode,
- wherein the lighting circuit is structured to be switchable between a normal mode in which a driving current that exceeds an oscillation threshold value is supplied to the laser diode and a test mode in which a driving current that is lower than the oscillation threshold value is steadily supplied to the laser diode.
A lighting device system comprising:
- a vehicular lighting device comprising a light source comprising a laser diode and a lighting circuit structured to supply a driving current to the laser diode;
- and
- a vehicular ECU (Electronic Control Unit) structured to control the vehicular lighting device,
- wherein the vehicular lighting device is structured to steadily supply, to the laser diode, a driving current with a current value that is smaller than an oscillation threshold value in response to an instruction from the vehicular ECU, so as to instruct the laser diode to emit light in a non-oscillation state.
-15. (canceled)
Dependencies are inferred from the claim text.