Laser drilling system utilizing photoacoustic feedback
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United States of America Patent
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-
Mar 12, 1985
Issued Date -
N/A
app pub date -
Dec 30, 1982
filing date -
Dec 30, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A laser drilling control system utilizing photoacoustic feedback is described. The control system provides an accurate monitoring of the laser drilling of a multilayered printed circuit board thereby allowing uniform drilling through layers of different optical and photoacoustic properties by both analyzing the photoacoustic feedback signals received, and adjusting optimally the laser parameters such as pulse duration, wavelength, energy, pulse repetition rate, and the number of pulses, for each successive layer. The system also provides an end point detection which prevents underdrilling overheating, and overdrilling of underlying layers and associated damages. According to another aspect of this invention, the control system can be used as a sensitive misregistration detector for aligning the laser beam to a selected drill site for subsequent drilling at the selected drill site.
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