End-of-vector laser power control in a selective laser sintering

Details End-of-vector laser power control in a selective laser sintering End-of-vector laser power control in a selective laser sintering

1997-05-30

2000-07-04

Gordon, Paul P.

Data processing: generic control systems or specific application

Specific application, apparatus or process

Product assembly or manufacturing

700166, G06F 1900

Patent

active

060851228

ABSTRACT:
A selective laser sintering apparatus and method is disclosed, in which the laser power is controlled according to the scan velocity. The scanning system, which includes a pair of galvanometer-controlled mirrors for directing the aim of the laser beam, generates signals indicative of either the position or scan velocity of the aim of the beam, in either one or two directions. The signals are gated in the laser power control system so as to pass the signals only during those times at which the laser is to be turned on. A laser power control system receives the signals and, in the case of position signals, differentiates the signals to generate velocity signals. The velocity signals are used to derive a scan velocity, and the scan velocity is multiplied by the desired laser power at full scan velocity to produce a laser power control signal. By making the laser power dependent upon the scan velocity, a constant laser energy flux density is applied to powder at the target surface, even during acceleration and deceleration intervals at the beginning and end of a scan, respectively.

REFERENCES:
patent: 4247508 (1981-01-01), Housholder
patent: 4540867 (1985-09-01), Ackerman
patent: 4863538 (1989-09-01), Deckard
patent: 4944817 (1990-07-01), Bourell et al.
patent: 5014207 (1991-05-01), Lawton
patent: 5017753 (1991-05-01), Deckard
patent: 5076869 (1991-12-01), Bourell et al.
patent: 5132143 (1992-07-01), Deckard
patent: 5155324 (1992-10-01), Deckard et al.
patent: 5182170 (1993-01-01), Marcus et al.
patent: 5352405 (1994-10-01), Beaman et al.
patent: 5616294 (1997-04-01), Deckard

Affiliated with

Also associated with

Rating

End-of-vector laser power control in a selective laser sintering does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with End-of-vector laser power control in a selective laser sintering, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and End-of-vector laser power control in a selective laser sintering will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1494790