Line Laser module DEEP BLUE 20mW 405nm, adjustable focus
Line angle optics:
5° glass + glass colli
Collimator:
Acrylic
Connection type:
Wires
LLM-20-405: 405-nm line laser module with 20 mW output and a very fine line width (< 0.5 mm at close range). 3–4 VDC, adjustable focus, selectable angle, 12 mm.
Regular price:
€94.62
Delivery time: In stock
Product number:
LLM-20-405.76
Description
Line Laser module DEEP BLUE 20mW 405nm, adjustable focus
20 mW Dark Blue (405 nm) Line Laser Module – LLM-20-405: Miniaturized line laser module operating at 405 nm in the violet-blue spectral range for integration into machines—with a very fine line width of less than 0.5 mm at close range.
- Dark blue laser line (405 nm) with 20 mW
- Minimum line width < 0.5 mm at close range
- Power supply: 3–4 VDC
- Selectable projection angle, adjustable focus
The 12-mm module is part of the MediaLas modular system: high reliability, typical service life of over 25,000 h, and adjustment of focus and line position directly on the module. The optics can be replaced at any time—even when installed—or substituted with glass elements. Matching mounts, ranging from flanges to 3D ball-head mounts, handle installation and heat dissipation.
Technical Specifications
| Laser Power | 20 mW |
| Wavelength/Color | 405 nm DARK BLUE |
| Projection Angle | selectable |
| Focus range | Approx. 5 cm to infinity |
| Minimum line width | <0.5 mm at close range |
| Divergence | typ. <0.5 mrad |
| Power supply | 3–4 VDC / < 200 mA—positive potential on the housing |
| Length of connection cables | Stranded wires approx. 200 mm, hollow plug approx. 200 mm, flexible cable approx. 100 cm |
| Laser class after setup | Class 1/2 |
| Dimensions | 12 x 37 / 42 mm |
| IP Rating: | IP 40 |
| Temperature Range | - 10°C to +40°C |
| Service life | typ. > 25,000 h |
Line Length and Line Width
The length of the laser line is determined by the beam angle selected at the time of purchase. The following angles are available for the LLM-20-405:
| Angle | Distance | Line length approx. |
|---|---|---|
| 5° | 1 m | 8–9 cm |
| 10° | 1 m | 17 cm |
| 20° | 1 m | 0.34 m |
| 35° | 1 m | 0.62 m |
| 45° | 1 m | 0.85 m |
| 60° | 1 m | 1.16 m |
| 90° | 1 m | 2 m |
| 110° | 1 m | 3 m |
| 120° | 1 m | 3.4 m |
The line width (focus) is adjusted directly on the module—see the video "Adjusting the Line Width".
Notes
- Observe the laser class!
- For more information on laser safety, click here.
- For continuous operation, the module must be mounted in a heat sink
- Power supply must be stabilized and free of spikes!
- Shipped without a mount—please order separately
Options
- Hollow-pin connector; direct operation via plug-in power supply possible
- Glass collimator for greater stability during temperature fluctuations
- Glass line optic, finer line, bright in the center, tapering toward the ends
Downloads / Links
Properties
| Collimator: | Acrylic, Glass |
|---|---|
| Connection type: | 12-25VDC, 110-230VAC, Barrel connector, Wires |
| Line angle optics: | 5° glass + glass colli, 10° glass + glass colli, 20° glass + glass colli, 35°, 45°, 60°, 70°, 90°, 110°, 110° glass optics |
How long is the laser line at a given distance?
At a distance of 1 m, the following lengths result (12-mm modules):
| Angle | Distance | Line length approx. |
|---|---|---|
| 10° | 1 m | 17 cm |
| 20° | 1 m | 35 cm |
| 30° | 1 m | 54 cm |
| 35° | 1 m | 63 cm |
| 45° | 1 m | 83 cm |
| 60° | 1 m | 116 cm |
| 70° | 1 m | 140 cm |
| 90° | 1 m | 200 cm |
| 110° | 1 m | 300 cm |
The line length increases linearly with distance; at a distance of 2 m, these values double.
Why must the power supply be „stabilized and peak-free“?
Laser diodes react sensitively to voltage spikes and current fluctuations. An unregulated supply or one with peaks can destroy the diode within microseconds – even if the peak occurs only briefly. Stabilized means: constant output voltage under load (no sag during switch-on). Peak-free means: no switching spikes or overshoot on the supply lines. Always use a switching power supply with sufficient smoothing or a dedicated laser diode driver. Avoid unfiltered supplies, cheap plug-in adapters without filtering, and supplies that are shared with other switching loads.
Which connection variants are available?
Our 12 mm line laser modules are available with three connection variants:
Stranded wires (standard) – open red/black wires, approx. 100–200 mm length, for direct connection to microcontrollers or driver boards.
Barrel connector – 5.5 / 2.1 mm standard barrel plug, approx. 200 mm cable, for operation with a 230 VAC plug-in power supply.
Flexible cable with ferrules – approx. 100 cm flexible cable for direct connection to a 12–25 VDC machine controller. Reverse-polarity protection is integrated in the DC variant.
On request we also supply M8 / M12 connectors with custom cable lengths. The DC variant is particularly suited for retrofitting existing machines without 230 V wiring.
Stranded wires (standard) – open red/black wires, approx. 100–200 mm length, for direct connection to microcontrollers or driver boards.
Barrel connector – 5.5 / 2.1 mm standard barrel plug, approx. 200 mm cable, for operation with a 230 VAC plug-in power supply.
Flexible cable with ferrules – approx. 100 cm flexible cable for direct connection to a 12–25 VDC machine controller. Reverse-polarity protection is integrated in the DC variant.
On request we also supply M8 / M12 connectors with custom cable lengths. The DC variant is particularly suited for retrofitting existing machines without 230 V wiring.
Glass optics vs. acrylic optics – when which?
Acrylic optics (PMMA plastic): low cost, light, dimensionally stable. Optically very good in standard applications, but temperature-sensitive – the refractive index changes with temperature, shifting the focus when variation exceeds ±5 °C. Perfectly adequate for indoor applications with stable conditions. Glass optics: heavier, more expensive, but temperature-stable. The refractive index stays nearly constant across wide temperature swings. Ideal for: outdoor mounting, unheated halls, machines with large temperature swings (welding, sawmills in summer/winter) and applications needing high repeat accuracy over long periods. Glass optics are available as an optional upgrade on our KLM and LLM modules.
How is the line width (focus) of a line laser adjusted?
On our 12 mm line laser modules the line width – also called „focus“ – can be adjusted directly on the module. The optics sit in the front brass ring and can be turned precisely via a fine thread. Rotate the ring carefully until the desired line width appears sharp at your working distance. After adjustment, secure the optics with a drop of thread-locking varnish in the thread groove to prevent drift. The adjustment also works while the module is installed. On industrial line lasers (e.g. the IL-HP series) the line width is set at the factory to the customer specification. You can find out how to adjust the line here.
Which laser class do I need for my application?
The laser class according to EN 60825-1 determines the required safety measures. Class 1: safe even when looking directly into the beam – ideal for open applications without protective measures. Class 2: visible lasers up to 1 mW, relying on the blink reflex – unproblematic in B2B environments. Class 1M / 2M: eye-safe under normal conditions, but not when viewed through magnifiers or binoculars. Class 3R: increased risk on direct viewing – safety goggles recommended. Class 3B: safety goggles mandatory. Line and cross-line lasers benefit from relaxed rules because they are classified as „extended sources“ (see laser safety).
What do the IP ratings IP 40, IP 44 and IP 65 mean?
The IP rating (International Protection) indicates which environmental influences the housing is protected against. IP 40: protected against solid objects > 1 mm, no water protection – for dry indoor use and machine integration. IP 44: also protected against splash water from all directions – typical for industrial halls and covered outdoor areas. IP 65: completely dust-tight and protected against water jets from any direction – the right choice for sawmills and circular saws (wood dust, sawdust), washing facilities, splash-water environments and rough industrial use.
What do I need to know about visibility, wavelength, and laser color?
The brightness of the laser line depends on many factors. In short:
Line length: The longer the line, the lower the brightness, as the light output is spread over a larger area
Laser color: Green appears significantly brighter than red or blue
Work surface: The darker and more matte the surface, the darker the light appears
Ambient brightness: The brighter the ambient light, the darker the laser line appears. This is due to the human eye, which reduces its sensitivity depending on the ambient brightness. In direct sunlight, it is very difficult to see a laser line because the retina is already saturated.
Laser power: The higher the laser power, the brighter the laser line
Wavelength in detail: The wavelength determines how visible the line is on your surface. Red (650 nm) is the lowest-cost option and sufficient in moderately lit indoor environments. Light red (635 nm) appears noticeably brighter than 650 nm at the same power. Green (520 / 532 nm) is the most universal choice – the human retina is most sensitive in the green spectral range, so green lines appear roughly 5–7× brighter than red at equal power. Blue (450 nm) delivers high contrast on greenish surfaces, where red and green fade into the background.
Line length: The longer the line, the lower the brightness, as the light output is spread over a larger area
Laser color: Green appears significantly brighter than red or blue
Work surface: The darker and more matte the surface, the darker the light appears
Ambient brightness: The brighter the ambient light, the darker the laser line appears. This is due to the human eye, which reduces its sensitivity depending on the ambient brightness. In direct sunlight, it is very difficult to see a laser line because the retina is already saturated.
Laser power: The higher the laser power, the brighter the laser line
Wavelength in detail: The wavelength determines how visible the line is on your surface. Red (650 nm) is the lowest-cost option and sufficient in moderately lit indoor environments. Light red (635 nm) appears noticeably brighter than 650 nm at the same power. Green (520 / 532 nm) is the most universal choice – the human retina is most sensitive in the green spectral range, so green lines appear roughly 5–7× brighter than red at equal power. Blue (450 nm) delivers high contrast on greenish surfaces, where red and green fade into the background.
What is a line laser and what is it used for?
A line laser projects a line of light onto a surface – unlike a point laser, which only shows a single dot. The line is generated by a cylindrical lens that spreads the round laser beam into a fan. Typical applications include cut-line projection on saws, circular saws and CNC machines, workpiece positioning in manufacturing and machine integration, operator guidance at manual workstations, and reference lines in inspection and measurement setups. Line laser modules are available in different wavelengths (red, green, blue), power classes (1 – 500 mW) and IP ratings (IP 40 for dry indoor use up to IP 65 for sawmills and splash-water environments).