| 摘要 |
The transmitter has an adjusting unit (2) transmitting an adjusting ray of light within a visible range, which runs parallel to a main ray of light of a light barrier. The adjusting ray of light has a smaller aperture angle of less than 1 degree than the main ray of light, where the adjusting ray of light is produced by a laser unit (5). The unit (2) is attached to a transmission unit that is provided in an attachment housing (1), where the transmission unit is rotatable around a rotation axis (20), and the adjusting ray of light is perpendicular to the rotation axis of the transmission unit. |
