F-Theta Scan Lens Laser Marking Optics, Digital Galvo Heads & Rotary Subsystems
Kales supplies precision f-theta scan lens laser marking optics (70 × 70 mm to 300 × 300 mm), 10 mm aperture digital galvo scanners, beam expanders, D80/D100 rotary chucks, and genuine BJJCZ EZCAD control cards for OEM integrators and maintenance teams. Focal length and substrate glass selection depends on laser wavelength and spot-size tolerances, with 1 Set MOQ and 3–5 day dispatch.
Our #1 universal industrial scan lens balancing crisp 25 µm metal/plastic marking with generous 110×110 mm part coverage.
F-Theta Scan Lens Laser Marking Focal Length, Spot Size & Field Matrix
In a 2-axis galvo scanner, an F-Theta flat-field lens ensures image displacement is linearly proportional to scan angle ($y = f \cdot \theta$) while focusing the beam across a flat work plane. Compare our standard 1064 nm, 355 nm quartz, and 10.6 µm ZnSe F-Theta lenses below.
| Part Series & Field Size | Effective Focal Length (EFL) | 1064 nm Spot Size (10 mm Beam) | 355 nm UV Spot Size | Depth of Focus & Mount Thread |
|---|---|---|---|---|
| KL-FT-70 (70 × 70 mm) | f = 100 mm | 18 µm (0.018 mm) | 8 µm (Telecentric Quartz) | ±0.25 mm DOF · M85 × 1 mm thread |
| KL-FT-110 (110 × 110 mm) | f = 160 mm / 163 mm | 25 µm (0.025 mm) | 10 µm (UV Fused Silica) | ±0.50 mm DOF · M85 × 1 mm thread |
| KL-FT-150 (150 × 150 mm) | f = 210 mm | 35 µm (0.035 mm) | 14 µm (UV Fused Silica) | ±0.85 mm DOF · M85 × 1 mm thread |
| KL-FT-175 (175 × 175 mm) | f = 254 mm | 42 µm (0.042 mm) | 16 µm (UV Fused Silica) | ±1.20 mm DOF · M85 × 1 mm thread |
| KL-FT-220 (220 × 220 mm) | f = 330 mm | 52 µm (0.052 mm) | 22 µm (UV Fused Silica) | ±2.10 mm DOF · M85 × 1 mm thread |
| KL-FT-300 (300 × 300 mm) | f = 420 mm | 65 µm (0.065 mm) | — (Use 1064 nm or ZnSe CO2) | ±3.50 mm DOF · M85 × 1 mm thread |
Fused Silica Quartz vs K9 Optical Glass & Telecentric Scan Lens Physics
Standard low-cost K9 (BK7) glass 1064 nm F-Theta lenses work well on 20 W and 30 W fiber markers, but above 50 W average power or 1.5 mJ pulse energy, multi-photon absorption heats K9 glass and causes thermal lensing focal shift. For 50 W to 100 W MOPA deep engraving and all 355 nm UV systems, we supply JGS1 fused silica quartz F-Theta lenses with high-damage-threshold (> 15 J/cm²) anti-reflective coatings that eliminate focal drift during long engraving cycles. When drilling micro-vias in PCBs or scribing silicon wafers, standard F-Theta lenses introduce a 10°–15° chief-ray incidence angle near the outer edges of the field, creating tapered hole walls. Upgrading to our Telecentric F-Theta lens keeps the exiting laser beam perpendicular (< 0.5° telecentricity error) across the entire 70 × 70 mm or 110 × 110 mm work area.
CHIEF-RAY ANGLE COMPARISONStandard F-Theta (10°–15° Edge Tilt) vs. Telecentric (<0.5° Normal)
Telecentric quartz F-Theta lenses bend the exiting beam so every pulse strikes strictly perpendicular (90°) across the field—eliminating tapered hole walls in PCB micro-vias and wafer dicing.
MODULAR OEM OPTICAL CHAINCollimator → Beam Expander → 10 mm Digital Galvo → M85×1 Lens
Standardized M22×0.75 beam expander threads, XY2-100 digital servo galvo heads, and M85×1 scan lens mounts allow drop-in replacement on any industrial laser marker.
Digital Galvo Heads, D69/D80/D100 Rotary Chucks & Genuine BJJCZ EZCAD Cards
We cross-check your existing lens part number, galvo model, or BJJCZ board photo and supply drop-in OEM replacement parts with matching.cor calibration files.
10 mm & 14 mm Digital Galvo Scan Heads
High-speed dual-axis servo galvanometers (SG7110 / SG2206) with dielectric silicon or UV quartz mirrors achieving 7,000–10,000 mm/s positioning speed.
D69 / D80 / D100 3-Jaw Rotary Chucks
Stepper-motor rotary fixtures with internal/external self-centering jaws and -15° to +90° tilt beds for rings, tumblers, bearing races, and flanges.
BJJCZ EZCAD2/3 Cards & Beam Expanders
Genuine LMCV4-FIBER-M, DLC2-M4, and 2x–8x Galilean quartz beam expanders (M22 × 0.75 thread) for OEM machine builders and retrofits.
Suzhou Cleanroom Interferometry, AR Coating QC & Express Dispatch
Every F-Theta lens, beam expander, and galvo scanner stocked in our Suzhou warehouse undergoes interferometer wavefront inspection and thread gauge verification prior to shipping. We pack optical components in desiccant-sealed cleanroom cases for worldwide DHL/FedEx express delivery.
Laser Interferometer Wavefront Audit · < λ/4 P-V
Verifies spherical aberration and focal plane flatness across each F-Theta lens assembly.
AR Coating Spectrophotometer Check · > 99.2% Transmission
Dual-band anti-reflective coatings (working wavelength + 650 nm red guide beam) tested for zero ghost reflections.
Galvo Servo Step-Response & Drift Burn-In · 48 Hours
Digital galvo heads run continuous high-frequency grid scans to verify zero servo hunting.
Anti-Static Cleanroom Case & DHL/FedEx Express · 3–5 Days
Optics are nitrogen-purged and foam-packed for 3–5 business day global air express delivery.
Frequently Asked Questions About F-Theta Scan Lens Laser Marking & Subsystems
How does focal length affect spot size in f-theta scan lens laser marking?
In f-theta scan lens laser marking, focused spot diameter is directly proportional to focal length ($d \propto f \cdot \lambda / D$). Switching from a 110 × 110 mm lens (f=160 mm, 25 µm spot) to a 300 × 300 mm lens (f=420 mm, 65 µm spot) expands your marking area 7x but reduces peak energy density.
When should I upgrade from a K9 glass F-Theta lens to a fused silica quartz lens?
Standard K9 optical glass lenses are suitable for 20 W and 30 W 1064 nm fiber lasers. However, if you run a 50 W, 60 W, or 100 W fiber/MOPA laser for deep engraving—or any 355 nm UV laser—you must use a JGS1 fused silica quartz lens to prevent thermal lensing focal shift and coating burn.
What is a telecentric F-Theta lens, and when is it required?
A standard F-Theta lens bends the laser beam at an angle near the edges of the marking field, which is fine for surface text. A telecentric F-Theta lens keeps the beam strictly vertical (< 0.5° angle) across the entire field, which is mandatory for PCB micro-via drilling, wafer dicing, and precision stencil cutting.
How do I calibrate EZCAD after swapping to a different F-Theta lens field size?
Whenever you change F-Theta focal lengths (for example from 110 × 110 mm to 175 × 175 mm), adjust the Z-axis height to the new working distance, update the field size parameter in EZCAD F3 Config, and load the matching 9-point.cor distortion correction file included on our USB drive.
Are your M85x1 F-Theta lenses and D80 rotary chucks compatible with other laser brands?
Yes, our F-Theta lenses use the industry-standard M85 × 1 mm mounting thread that fits Sino-Galvo, Scanlab, Sunny, and Raycus/JPT fiber and UV scan heads. Our D80 and D100 rotary chucks include standard 4-pin aviation plugs and DM542 stepper drivers compatible with any BJJCZ EZCAD control board.
What is the MOQ for spare lenses and accessories, and when should I replace the protective glass?
Our minimum order quantity is 1 Piece or 1 Set, shipped worldwide via DHL or FedEx within 3 to 5 business days. Replace the bottom threaded quartz protective window immediately if you see pitted spatter marks or experience a sudden drop in engraving depth, protecting the main F-Theta elements.
Order OEM F-Theta Lenses, Galvo Heads & Rotary Fixtures Direct from Suzhou
We verify optical thread compatibility, wavelength coatings, and EZCAD controller pinouts for single replacement parts and OEM volume schedules.
- 1. 48-Hour Microscope & Live Video Sample Report Send 3–5 parts or CAD drawings (.dxf / .ai / .pdf) to our Suzhou lab for side-by-side contrast, HAZ, and cycle-time proof.
- 2. 9-Point F-Theta Calibration & ISO/IEC 15415 Verification Every machine ships with a custom .cor lens distortion file backed up on USB and verified barcode grading.
- 3. Complete Turnkey FOB Shanghai / CIF / DDP Quotation Transparent configuration breakdown with 1 Set MOQ, 1–2 year factory warranty, and 4-hour remote TeamViewer/WhatsApp response.
- 4. Direct Suzhou Engineering Contact
Email:
miropan61@gmail.com| WhatsApp / Tel:+86 172 7940 5290