| 摘要 |
A light guide (201) comprising a transparent element (202) is presented. The transparent element comprises an optically active section (203) forming a cavity for a light source and shaped to modify the light distribution pattern of the light source, and at least one channel (205) beginning from the cavity. Each channel comprises a punctureable sheet (210) of the transparent material closing the channel so that puncturing the punctureable sheet opens, through the channel, a passage between the cavity and ambient of the light guide. When the sheet is left intact, i.e. not punctured, the above-described light guide is suitable for applications where hermetic sealing of the cavity is needed. On the other hand, by puncturing the sheet, the light guide can be made suitable for applications where pressure balancing and/or ventilation of the cavity are/is needed. |
