Scanlab RTC 4, Installation And Operation Manual

Page: 18 / 136

RTC
®
4 PC Interface Board
Rev. 1.3 e
4 Principle Of Operation
18
innovators for industry
Variable Jump Delay
During a jump vector, the laser focus (output
position) usually moves with a constant linear
velocity, the
jump speed . Since the jump speed is the
same for each jump vector, a constant jump delay is
required for settling of the mirrors.
However, if a jump vector is very short, the scanners
might not reach the full jump speed during the jump
because of the inertia of the mirrors. In this case, a
shorter jump delay might be sufficient for settling.
To make use of this, the RTC
®
4 offers a variable jump
delay mode . In this mode, the jump delay for short
jump vectors will be reduced in time, as shown in
figure 6 on page 18 . The minimum jump delay (for a
jump vector of zero length) and the jump length limit
are set by the user with the command
set_delay_mode (see page 104) .
When using the variable jump delay mode, total
marking time can be reduced, especially in
applications involving many short jumps.
Notes
To turn off the variable jump delay mode, simply
set the parameter
JumpLengthLimit
to zero.
Time
Real
Position
Lag
Jump
Delay
Jump
Command
Set Position
(Microvectors)
Laser
P
osition
5
Scan head control timing during a jump command with a jump
delay. The laser is not turned on.
0
l
Ju
mp
6
Minimum Jump Delay,
set by set_delay_mode
Variable Jump Delay
Top: length
l
of the jump vector
Bottom: Variation of the jump delay
Constant Jump Delay,
set by
set_scanner_delays
Jump Length Limit,
set by set_delay_mode
Jump Length
l
Jum
p
Delay