| 摘要 |
A drilling unit for drilling circuit boards comprising a plurality of laser drilling heads arranged in a series, means 1 for production of a common controlled and conditioned beam of laser energy which is directed to each of said plurality of laser heads in the series the conditioned source of laser energy is in the form of laser energy of two different frequencies,each being derived from a fundamental frequency of a laser generator and being independently controllable in output., at each intermediate laser head in the series a beam splitter 18,19 for collection of a required portion of laser energy from the laser beam and for transmission of a remaining portion of energy to a successive laser head in the series, and, at each laser head, control means for controlling the position of the laser energy on a workpiece, shuttering means 20,21 for shuttering off the laser energy when not required and focusing means for focusing the laser energy on the workpiece, and at the last laser head in the series mirror means for collection and for transmission of the remainder of the laser beam energy. |
