Method and apparatus for monitoring a laser ablation operation i

Measuring and testing – Vibration – By mechanical waves

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

21912168, 21912183, B23K 2602

Patent

active

056294840

ABSTRACT:
The invention, in its most basic form, is a sensor which detects sound generated by a laser ablation process. In a preferred embodiment of the invention, a conveyor system presents leadframe strips, having a fixed number of semiconductor packages which have not yet been singulated, to a laser marking apparatus. A dynamic microphone receives an analog input each time the laser marking apparatus makes a mark on a package. The analog input related to each mark is converted to a digital pulse. The series of pulses corresponding to the marking of packages on the leadframe strip are fed to a counter. The contents of the counter are compared with a preset number that corresponds to an expected number of pulses for the particular type of leadframe in use. The conveyor system is stopped so that the problem can be corrected if the expected number of pulses is not received by the counter, which indicates that one or more parts has not been properly marked. The invention may be applied to any operation requiring the marking of multiple sites on a single workpiece.

REFERENCES:
patent: 4504727 (1985-03-01), Melcher et al.
patent: 4608480 (1986-08-01), Bizot et al.
patent: 5026964 (1991-06-01), Somers et al.
patent: 5045669 (1991-09-01), Ortiz, Jr. et al.
patent: 5196006 (1993-03-01), Klopotek et al.
patent: 5286947 (1994-02-01), Clyde et al.
patent: 5329090 (1994-07-01), Woelki et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Method and apparatus for monitoring a laser ablation operation i does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for monitoring a laser ablation operation i, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for monitoring a laser ablation operation i will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1386989

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.