LP4 Laser Focusing Instructions

1. Lasers & Focusing

Field lenses are used with lasers to engrave onto the surface of specific materials. The LP4's laser beam is reflected and directed by the galvanometer mirror and refracted when passing through the lens.

Proper focusing ensures the energy of the laser beam is concentrated on one point resulting in an accurate high-quality effect. Improper focusing will result in unclear, uneven, or no effect at all.

Please make sure not to touch or scratch the Field lens of LP4.

2. LP4 Focal Range (Vertical)

See the table below:

The focal length of the LP4 is 150 mm and the maximum height of the unit, when attached to the Electric Stand, is 244 mm. Therefore, to achieve the proper focusing distance to engrave, the material thickness cannot exceed 94 mm.

3. LP4 Focal Length

The recommended focal length of LP4 is 150 mm.

Press the buttons at the top of the Electric Stand tower to raise or lower the Laser Unit by 0.5 mm.

Press and hold the button for a continuous movement up or down.

For proper focal distance, attach the Riser accessory to the Electric Stand bracket when using the Rotary Extension or Slide Extension.

4. LP4 Dual Red Light Focusing

The LP4 is equipped with dual red light focusing technology. In "Preview" mode, two red beams are emitted from apertures located next to the Laser Unit's lens. Each beam is set to converge at exactly 150 mm from the lens and when both red lights merge into one brighter dot on the surface of the work material, the optimal laser focal distance will be set.

5. LP4 Focusing Methods

3 practical focusing methods are possible based on different scenarios:

Red Light Focusing, Manual Measurement Focusing, or Safety Shield Focusing.

5.1 Red Dot Focusing

While in "Preview" mode, adjust the height of the Electric Stand up or down until the 2 emitted red lights overlap and merge into one on the surface of the work material.

LightBurn does not have a built-in command for Dual Red Light Focusing. The command will be added to the next versions of the LP4 LightBurn configuration package and LP4 firmware. Stay tuned for release information. To set the correct focal distance while using LightBurn, please use either the Manual Method or the Safety Shield Method as described below.

5.2 Manual Measurement Focusing

Measure the distance between the rim of the lens and the top of material to be engraved with a ruler and adjust the height of the Electric Stand until the lens is 150 mm from the material.

When measuring, please make sure to use the bottom rim of the lens and avoid touching the lens itself at all times.

5.3 Safety Shield Focusing

When the magnetic conical Safety Shield is attached to the LP4, the distance from the optical lens to the bottom of the shield will measure 150 mm. Adjust the height of the Electric Stand up or down until the bottom of the shield aligns with the top of the material to be engraved to set the optimal focal range.