EMS-8000 Digi
High-end, precision scanner system
with advanced digital servo driver
for 5mm and 6.5mm apertures
The EMS-8000 Digi is optimized for very high speed applications with medium sized beams
Key features include :
Galvo Motor
- Low inductance coreless design for the fastest acceleration
- Unparalleled heat transfer from coil to case, thanks to a novel bonding technique
- Greatly increased ball bearing lifetime, using an ''inside-out'' ball preloading
- High precision monolithic differential position detector cancels mismatch between discreet elements
- Position detector amplifier is built into the scanner, giving high S/N ratio while avoiding the need for
cumbersome dual shielded cables
Mirrors
- Fused silica substrate with whiteligt dielectric, YAG or CO2 coatings, flatness l/4 over 10mm diameter.
- Mirrors are designed and cut/milled inhouse. We have developed a special CNC setup for cutting and 3D
milling of mirror sheets, with 0.01mm precision.
- Unique back thinned mirrors with ceramic center supports, offer low inertia and high stiffness. This
translates to higher speeds, lower heat load for the motors and out-of-band resonances.
- Oversized mirror design to support 'square' beam profiles from diode matrix lasers.
Servo Driver
- Digital dual axis servo driver. Small dimensions, similar to most analog drivers on the market.
- Modified PID based control with extra filters and prediction enhancements.
- Canceling of mirror or rotor resonances without a notch-filter.
- Scanner position calculation using signal ratio method. No analog components (AGC) to hold the excitation
led steady, keeping drifts to a minimum.
- Pincushion and f-theta distortion correction in realtime, using mathematical calculations (not matrix tables
and fit curves). Ideal for additive manufacturing. The system designer does not have to cope with complex
routines in his control software. For laser display, it makes the projection ''square'', much like a video
projector.
- Motor protection routine de-tunes the servo when overloaded and keeps the power to the coil at safe levels.
- Integrated scan safety routine for laser display, blocks the laser when the beam velocity drops below a
certain limit. Threshold speed and activation time are adjustable via USB. Perfect match for our NanoAct
shutter.
- Two general purpose outputs, activated from specific patterns being sent to the driver. Control devices or
energize actuators for ''beam table'' type effects in laser display, without extra setup.
Specifications
Power requirements..............................+/-24V DC, 2.5A per rail
Control voltage.........................................+/-5V differential, +/-10V single ended
Scan field...................................................54 degrees optical
Linearity.....................................................99.9% over 40deg optical
Pincushion / f-theta correction...........99.5% over 40deg optical
Small step response, 5mm.................150μsec (60K ILDA speed)
Small step response, 6.5mm..............220μsec (40K ILDA speed)
Coil resistance.........................................2.2 Ohms
Realtime position out ...........................+/-10V
Beam velocity flag out...........................TTL Low @ low speed, TTL High @ high speed
Auxilliary outputs....................................TTL High when servo detects a <2% sized pattern positioned at one of the 4 corners of the scanfield.
Left side activates out1, right side activates out2.
Data connection.......................................Micro USB, Windows (tm) Application