Motor vehicle headlight equipped with a discharge lamp and with improved electromagnetic screening means
AssigneeValeo Vision
InventorGérard Billot
Life of this patent
Estimating the term…
Abstract
A motor-vehicle headlight uses a gas-discharge lamp with a power-supply circuit, the lamp being mounted in a mirror. A screening device reduces interfering electromagnetic emissions. The power-supply circuit is in a housing to the rear of the lamp, and the screening device has a conducting material entirely surrounding the housing and able to provide electrical continuity between a screening braid of a power-supply cable arriving at the said housing and screening arrangements which are associated with the mirror. The invention also proposes a gas-discharge lamp incorporating such screening means.
Claims32
A motor-vehicle headlight, comprising a gas-discharge lamp combined with a power-supply circuit and mounted in a mirror, and means of screening with respect to interfering electromagnetic emissions, the screening means comprising a conducting material,
- wherein the said power-supply circuit is accommodated in a housing associated with the lamp to the rear thereof, and the housing including the screening means which surrounds the power-supply circuit and is able to provide electrical continuity between a screening braid of a power-supply cable arriving at the said housing and screening arrangements which are associated with the mirror,
- wherein the headlight further comprises a second linking means for ensuring electrical continuity between the conducting material surrounding the housing and the screening braid, the second linking means including a conductive elastic means for retaining the lamp in axial position and bearing against the conducting, screening material, and wherein the elastic means, which is conducting and which, in the retaining position, is in contact with the screening braid of the cable.
A motor-vehicle headlight, comprising a gas-discharge lamp combined with a power-supply circuit and mounted in a mirror, and means of screening with respect to interfering electromagnetic emissions, the screening means comprising a conducting material;
- wherein the said power-supply circuit is accommodated in a housing associated with the lamp to the rear thereof, and the housing including the screening means which surrounds the power-supply circuit and is able to provide electrical continuity between a screening braid of a power-supply cable arriving at the said housing and screening arrangements which are associated with the mirror;
- wherein the said conducting material belongs to a cover affixed to the rear of the mirror and surrounding a non-conducting casing defining the said housing.
A motor-vehicle headlight, comprising a gas-discharge lamp combined with a power-supply circuit and mounted in a mirror, and means of screening with respect to interfering electromagnetic emissions, the screening means comprising a conducting material;
- wherein the said power-supply circuit is accommodated in a housing associated with the lamp to the rear thereof, and the housing including the screening means which surrounds the power-supply circuit and is able to provide electrical continuity between a screening braid of a power-supply cable arriving at the said housing and screening arrangements which are associated with the mirror;
- wherein the headlight comprises first linking means for ensuring electrical continuity between the said conducting material surrounding the said housing and a second, screening, conducting material provided at the rear surface of the mirror;
- wherein the said conducting material belongs to a cover affixed to the rear of the mirror and surrounding a non-conducting casing defining the said housing and wherein the first linking means comprise arrangements for supporting the said cover against the said second conducting material at the rear of the mirror.
A motor-vehicle headlight, comprising a gas-discharge lamp combined with a power-supply circuit and mounted in a mirror, and means of screening with respect to interfering electromagnetic emissions, the screening means comprising a conducting material;
- wherein the said power-supply circuit is accommodated in a housing associated with the lamp to the rear thereof, and the housing including the screening means which surrounds the power-supply circuit and is able to provide electrical continuity between a screening braid of a power-supply cable arriving at the said housing and screening arrangements which are associated with the mirror;
- wherein the headlight comprises second linking means for ensuring electrical continuity between the said conducting material surrounding the said housing and the said screening braid;
- wherein the said conducting material belongs to a cover affixed to the rear of the mirror and surrounding a non-conducting casing defining the said housing, and wherein the said second linking means comprise arrangements for support against the braid of the power supply cable, which are formed on the said cover around an orifice for the said cable to pass.
A gas-discharge lamp for a motor-vehicle headlight, the said lamp being combined with a power-supply circuit, which lamp incorporates the said power supply circuit, in a housing, and which further comprises screening means comprising a conducting material entirely surrounding the said housing and able to ensure electrical continuity between a screening braid of a power-supply cable arriving in the housing and screening arrangements provided on a mirror able to accommodate the said lamp,
- wherein the lamp engages with a second linking means for ensuring electrical continuity between the conducting material surrounding the housing and the screening braid, the second linking means including a conductive elastic means for retaining the lamp in axial position and bearing against the conducting, screening material, and wherein the elastic means, which is conducting and which, in the retaining position, is in contact with the screening braid of the cable.
Dependencies are inferred from the claim text.