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Laser Drill Diagnostics

IP.com Disclosure Number: IPCOM000050080D
Original Publication Date: 1982-Sep-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Klauser, HE: AUTHOR

Abstract

In the laser drilling of via holes in glass epoxy substrates for printed circuits (PCs), it has been observed that uniformity and repeatability of the laser pulse delivered to each drilling site are important. The energy per pulse as well as the total number of pulses have to be controlled. Any fluctuations in laser output power and/or any adjustment of the optical beam path because of the particular location coordinates of the hole, however, can give rise to variation in the laser pulse(s).

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Laser Drill Diagnostics

In the laser drilling of via holes in glass epoxy substrates for printed circuits (PCs), it has been observed that uniformity and repeatability of the laser pulse delivered to each drilling site are important. The energy per pulse as well as the total number of pulses have to be controlled. Any fluctuations in laser output power and/or any adjustment of the optical beam path because of the particular location coordinates of the hole, however, can give rise to variation in the laser pulse(s).

These variations can be diagnosed with the system described in
[*] by using the "signal a" referred to therein.

Reference
[*] H. E. Klauser, "Closed-Loop Laser Control System." IBM

Technical Disclosure Bulletin 24, 4691-4693 (February 1982).

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