| 摘要 |
A transparent lens for the front of a pedal cycle headlamp has a first set of elongated prisms arranged to extend horizontally and thereby modify the transmitted light distribution in the vertical direction and a second set of elongated prisms arranged to extend vertically and thereby modify the transmitted light distribution in the horizontal direction, the prisms extending over only part of the lens area thereby leaving part of the lens area through which light may be transmitted without modification by the prisms.
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