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US 5,093,768 AGranted
Signal lamp composed of light emitting diodes for vehicle
AssigneeStanley Electric Co., Ltd.
InventorKouji Ohe
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AssigneeStanley Electric Co., Ltd.
InventorKouji Ohe
Estimating the term…
An improved signal lamp for a vehicle is composed of a plurality of dome type light emitting diodes and a plurality of reflective mirrors arranged corresponding to the light emitting diodes. Each of the reflective mirrors is designed in the shape of a rotational parabolic surface whose focus is located at the position coincident to the foremost end of the corresponding light emitting diode or at the position in the vicinity of the foremost end of the corresponding light emitting diode. The rotational parabolic surface is configured such that a virtual light source appearing on each light emitting diode is located at the position coincident with the focus of the corresponding reflective mirror or at the position in the vicinity of the focus of the corresponding reflective mirror. Each light emitting diode chip is sealably received in a transparent cylindrical case molded of synthetic resin such that a large part of light generated by the light emitting diode chip is emitted directly from the light emitting diode chip so as to allow it to be radiated to the outside through the lens portion at a radiating angle ranging from 10.degree. to 12.degree. as measured from the optical axis.
In a signal lamp for a vehicle composed of a plurality of dome-type light emitting diodes and a plurality of reflective mirrors arranged corresponding to said light emitting diodes, each comprising a diode chip encapsulated in a transparent body having a generally cylindrical shape and terminating in a hemispheric-shaped top, said chip being arranged to lie substantially along the longitudinal axis of said transparent body at a spaced distance from the intersection of the longitudinal axis and the periphery of said hemispheric-shaped top, and a lens positioned to pass light rays directly from said light emitting diodes and reflected from said reflective mirrors, the improvement wherein each of said reflective mirrors is designed in the shape of a parabolic surface of revolution whose axis of revolution is substantially coincident with the longitudinal axis of its associated light emitting diode and whose focus is located substantially at a position coincident with said intersection or a position in the vicinity of said intersection to cause more uniform distribution of light rays from each light emitting diode over the surface of the reflective mirror associated therewith.
In a signal lamp for a vehicle comprising a plurality of dome-type light emitting diodes and a plurality of reflective mirrors each associated with one of said light emitting diodes, the improvement wherein each of said dome-type light emitting diodes comprises a light emitting diode element sealably received within a substantially cylindrical shaped transparent body molded of a synthetic resin, said cylindrical shaped body terminating in a dome-shaped end;
In a signal lamp for a vehicle comprising a plurality of dome-type light emitting diodes and a plurality of reflective mirrors each associated with one of said light emitting diodes, the improvement wherein each of said dome-type light emitting diodes comprises a light emitting diode element sealably received within a substantially cylindrical shaped transparent body molded of a synthetic resin, said cylindrical shaped body terminating in a dome-shaped end;
Dependencies are inferred from the claim text.