Lighting device
AssigneeDenso Corporation
InventorMasanao Higuchi
Life of this patent
Estimating the term…
Abstract
A lighting device includes first and second power source lines supplied with a driving current, first and second switching portions that respectively allow or prohibit supply of the driving current to the first and second power source lines, first and second current application lines respectively coupled with the first and second power source lines, first and second light-emitting element groups respectively disposed on the first and second current application lines, a driving portion coupled with the first and second current application lines and allowing flow of the driving current to the first and second current application lines, and a control portion that controls the first and second switching portions and the driving portion.
Claims6
A lighting device for lighting an indicating part in a display instrument, the lighting device comprising:
- a first power source line and a second power source line supplied with a driving current;
- a first switching portion that allows or prohibits supply of the driving current to the first power source line;
- a second switching portion that allows or prohibits supply of the driving current to the second power source line;
- a first current application line coupled with the first power source line;
- a first light-emitting element group including at least one light-emitting element and disposed on the first current application line;
- a second current application line coupled with the second power source line;
- a second light-emitting element group including at least one light-emitting element and disposed on the second current application line;
- a driving portion coupled with the first current application line and the second current application line, the driving portion allowing flow of the driving current to the first current application line and the second application line;
- and
- a control portion that controls the first switching portion, the second switching portion, and the driving portion.
The lighting device according to claim 2, wherein the driving portion coupled with the first current application line and the second current application line is a first driving portion, the lighting device further comprising:
- a third current application line coupled with the first power source line, and
- a third light-emitting element group including at least one light emitting element and disposed on the third current application line;
- a second driving portion coupled with the third current application line and allowing flow of the driving current to the third application line;
- a resistance line;
- and
- a resistor disposed on the resistance line,
- wherein the third current application line includes a cathode portion located between a the third light-emitting element group and the second driving portion, and
- wherein the resistance line couples the cathode portion with the second power source line.
Dependencies are inferred from the claim text.