Laser drilling system utilizing photoacoustic feedback

Details Laser drilling system utilizing photoacoustic feedback Laser drilling system utilizing photoacoustic feedback

1982-12-30

1985-03-12

Albritton, C. L.

Electric heating

Metal heating

By arc

219121LK, 219121LG, B23K 2700

Patent

active

045047278

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.

REFERENCES:
patent: 3700850 (1972-10-01), Lumley et al.
patent: 4419562 (1983-12-01), Jon et al.
H. E. Klauser, "Close-Loop Laser Control System", Feb. 1982, pp. 4691-4692, vol. 24, No. 9, in the IBM Technical Disclosure Bulletin.
C. E. Yeack, R. L. Melcher, H. E. Klauser, "Transient Photoacoustic Monitoring of Pulsed Laser Drilling", Dec. 1982, pp. 1043-1044, Applied Physics Letters 41, (11).

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