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          Dynamic Focusing Unit

 

Typical applications:

 

Drilling, cutting, welding

Laser deep engraving

Rapid prototyping, rapid tooling

Micro-structuring

3D work piece processing

 

Optics in motion

 

The dynamic focusing units of the LSSL-DNF series enable exceptionally precise, high-performance positioning of the laser focus along the optical axis.

 

In XY scan systems this unit can replace costly flat field objectives. Therefore, the unit is an ideal solution in applications for which standard flat field objectives are unavailable. The LSSL-DNF series can also extend XY scan systems into 3D beam deflection systems. The laser focus is guided along the contour of the work-piece being processed, thus enabling processing in three dimensions. The dynamic focusing unit additionally allows continuously adjusting the image field size, working distance and spot size. The high-end member of the LSSL-DNF series of focusing units is equipped with a digital linear encoder.

 

The LSSL-DNF series offers double the maximum travel of previous product and much lower tracking error, resulting in a larger focus-shift range and better spot quality. Its accuracy, speed, resolution and linearity, too, are clearly superior to those of all other units, while substantially eliminating the effects of drift. In addition, this unit delivers all advantages of driving technology: extensive flexibility, high dynamic performance, real-time querying of actual position and other status parameters, etc.

 

How it Works

 

During the scanning process, a diverging optic in this module is positioned with high dynamics along the optical axis with respect to a stationary focusing optic. This produces a change in the systems overall focal length, synchronized with the mirror motion. The dynamic focusing unit can thereby expand 2D scan systems into 3-axis scan systems. In 2D applications, this module can replace costly flat field objectives. In 3D beam deflection systems it enables processing in three dimensions.

 

The focusing optic of the LSSL-DNF-40F is motor-driven, enabling continuously variable image field sizes and working distances. The LSSL-DNF-40F housing contains all optical components and the electronics. For scan systems with apertures exceeding 40 mm, we offer LSSL-DNF-60, 60I, 80 and 80I and the LSSL-DNF-FC.

  

Control

 

The dynamic focusing unit is equipped with a digital standard interface and is easily controlled even synchronously with a 2D PC-based interface board scan system. The module is available for digital and analog-based control.

 

 

 

Optics

 

We offers dynamic focusing unit and the whole scan system optical configurations for a wide variety of working distances, image field sizes, beam diameters, wavelengths and laser powers for optimally tuning the system to the customers particular application. Thus, a maximum image field size is achieved with the minimum spot size.

 

 The LSSL-DNF-40 and LSSL-DNF-40I allows the customer to self-install various exchangeable optics sets. Their integrated air and water cooling ensure operation at very high laser powers. The LSSL-DNF-20I is equipped with a water-cooled entrance aperture.


 

Typical 3-Axis Scan System Optical Configurations

 

LSSL-DNF-20I

LSSL-DNF-40I

LSSL-DNF-40F

Laser

Nd:YAG

Nd:YAG x 3

CO2

CO2

CO2

Wavelength

1064 nm

355 nm

10.6 nm

10.6 μm

10.6 μm

XY scan unit

10mm aperture

14mm aperture

30mm aperture

30mm aperture

30mm aperture

Flat field objective

with f = 55 mm

without

without

without

without

Image field size

 

15 mm

(600x600)mm2

(500x500)mm2

(200x200)mm2 to (600 x 600)mm2

(600x600)mm2 to

(2000x2000)mm2

Focus range in z direction

4 mm

80 mm

100 mm

2mm to 40mm

2mm to 400mm

Focus diameter (1/e2)

<15μm (M2=1)

<75μm(M2=1)

550μm(M2=1)

200μm (M2=1)

to 550μm (M2=1)

550μm (M2=1)

to 1.8mm (M2=1)

Beam expansion factor

2.8

3.8

2.35

2.4 to 2.1

2.1 to 1.9

Average focus shift per lens travel

2 mm/mm

61 mm/mm

49.3mm/mm

-

-

Focal length

-

(1300122)mm

(850148)mm

(39518) mm

to (940140) mm

(94060)mm to (2850600) mm

Max. cw

laser power

20 W

50 W

1000 W

500 W

500 W

Operating temperature

25 C 10 C

25 C 10 C

25 C 10 C

25 C 10 C

25 C 10 C

Installation

horizontal position, electrically insulated, thermally connected

 

Type-Dependent Specifications (all angles are in optical degrees)

 

LSSL-DNF-20I

LSSL-DNF-40I

LSSL-DNF-40F

Beam input aperture

Up to max. 8 mm

Up to max. 16 mm

Up to max. 16 mm

Output aperture

Up to max. 20 mm

Up to max. 40 mm

Up to max. 40 mm

Motor specifications

Maximum lens travel

2 mm

3 mm

1.5 mm

Tracking error

0.55 ms

0.7 ms

1.4 ms

Typical travel speed

≤280 mm/s

≤140 mm/s

≤100 mm/s

Repeatability

< 0.5 μm

< 0.5 μm

< 1 μm

Nonlinearity

0.05 % FS

0.05 % FS

1.5 % FS

Long-term drift (over 8 hours, at constant environmental conditions)

< 3 μm

< 3 μm

< 10 μm

Power requirements

30 V DC (29-33V),

Max. 1.5 A each

30 V DC (29-33V),

Max. 1.5 A each

(15+1.5) V DC,

Max. 1.5 A each

Electrical connections

XY2-100 Enhanced,

SL2-100

XY2-100 Enhanced,

SL2-100

XY2-100 Standard, SL2-100 or

optical data transfer (1), (2)

Boards included

DSCB + interface board

DSCB + interface board

SSV30

Weight (depending on

optical configuration)

500 g to 700 g

approx. 2.4 kg

approx. 2.4 kg / 4.5 kg

(1) Analog version: input signals alternatively: 4.8 V; 9.6 V / 4.8 mA; 9.6 mA; output signals: TTL level

(2) For LSSL-DNF-40F: step motor inputs and limit-switch output signals

 

 

  Laser marking heads

Sintec Optronics Pte Ltd

10 Bukit Batok Crescent #07-02 The Spire Singapore 658079

Tel: +65 63167112 Fax: +65 63167113  

E-mail: sales@sintec.sg sales@SintecOptronics.com

URL: http://www.sintec.sghttp://www.SintecOptronics.com

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