| 摘要 |
A motor vehicle headlamp with a discharge lamp as its light source in which electromagnetic noise produced by the discharge lamp or by the glow switch starter and which leaks out of the headlamp is eliminated. A lighting circuit unit is provided which includes a casing on the inner surface of which an electrically conductive layer is formed for shielding electromagnetic noise, and a lighting circuit for the discharge bulb accommodated in the casing and coupled to the rear end portion of a lamp body. In another embodiment, the rear end portion of a lamp body, on the inner surface of which an electrically conductive grounding layer is formed, is formed into a noise shielding chamber closed with a partition board capable of blocking electromagnetic noise, and a lighting circuit for the discharge bulb is accommodated in the noise shielding chamber.
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