| 摘要 |
In a display unit (1), an approximately annular optical conductor (6) rises helically from a set back plane up to a dial (2). At the same time, the cross-sectional surface of the optical conductor (6) decreases from a section (8) inclined toward a light source (7) shining into the optical conductor (6) to a section (9) inclined toward the dial (2). As a result, the light beams strike the boundary surfaces of the optical conductor (6) at an angle which becomes steeper and steeper, so that an increasing portion of the relayed light is coupled out of the optical conductor (6) and thus also ensures an adequate brightness at the section (9) inclined away from the light source (7). At the same time, differences in brightness are evened out so that even scratches and soiling of the optical conductor (6) are invisible to a viewer.
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