Back to results
US 5,111,105 AGranted
Vehicular lighting device
AssigneePIAA Corporation
InventorTeruaki Yamamoto
Life of this patent
Estimating the term…
Abstract
An optical valve for use in a lamp of a motor vehicle comprises a main filament, and a sub-main filament. A multi-layer film is coated over a glass tube at the portion corresponding to the sub-main filament to produce yellow light. When driving at night and passing by a motor vehicle coming from the opposite direction, the sub-main filament is heated and produces yellow light which will not daze a driver's eyes, thus preventing dangerous situations to the drivers.
Claims20
A lamp bulb, used in a motor vehicle, comprising:
- a glass tube with a forward and a rearward portion;
- a sub-main filament positioned in the forward portion of the glass tube;
- a main filament positioned in the rearward portion of the glass tube, and rearwardly of the sub-main filament;
- and
- a luminous film extending to coat only the forward portion of the glass tube forwardly of the main-filament, which filters light emitted from the sub-main filament located in the forward portion of the glass tube.
2 more elements
A lamp bulb, used in a motor vehicle, comprising:
- a glass tube with a forward and a rearward portion with respect to the longitudinal axis of the path of the light emitted;
- a sub-main filament positioned in the forward portion of the glass tube;
- a main filament positioned in the rearward portion of the glass tube, and rearward of the sub-main filament;
- and
- a luminous multi-layered film extending to coat only the forward portion of the glass tube forwardly of the main-filament, which filters light emitted from the sub-main filament located in the forward portion of the glass tube.
2 more elements
Dependencies are inferred from the claim text.