Importance

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Abstract

A containing case for a luminous display in a motor vehicle instrument panel wherein the display brightness may be controlled according to ambient light intensity includes a generally opaque cover member having a window with an opaque tube extending backward therefrom and a base member including a photosensitive device in a cup having an open axial end adapted to project into the open end of the tube, so that the interior of the tube and cup are optically isolated from the display. The tube has an inner diameter which tapers outwardly toward its open end. A light conducting conduit member has a step-down diameter end portion adapted for retention in the cup and a main portion having a diameter which is at least as large as the cup outer diameter adjacent the cup but tapers to fit the tube inner diameter along its axial length. The conduit member thus functions both as a conduit for ambient light from the window to the photosensitive device and as an aid in aligning the base and cover members during assembly.

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First Claim