Wafer edge under a cassette
LEU-1220 flat head 3.5 mm thick, 12 mm, slipped under the wafer. A Ø3 mm barrel would lift the cassette.
Side-view · flat · custom · focusing lenses
Special Fiber Units and Focusing Lenses
The units that exist because a standard one does not fit: a side-view head, a flat head that slips under a wafer, a 16-core bundle for a wide line, and screw
Model LER-95W · LEU-1220 · LEU-1230 · LEU-D520 · LK2 / LK3 / LK4 / LK9 · Brand LE Raun · Category: Fiber Optic Sensors
HeadsSide-view / flat / custom
CoresØ0.25 – Ø1.0 mm
LensesØ5 – Ø9 mm
Temperature−50 to +70 °C
Overview
Most fiber applications are solved by a standard unit and a bracket. The residue — a head that has to be 3.5 mm thick, a beam that has to leave at 90°, a line 5 mm wide — is what this page covers.The LEU flat heads slip under a wafer or into a 5 mm slot. The LER-95W turns the beam in a 6 mm head. The 16-core versions spread the light over a line instead of a dot, which is what an edge or a web needs. The focusing lenses screw onto any M3 unit and change the geometry of the light itself: a wider spot further away, or a small spot close up.None of these are stock-and-forget parts; they are specified against a fixture drawing. Send the drawing with the model you think you need and we will confirm the geometry before it is made.
Application scenarios
Web edge on a slitter
LEU-D520C-05 across a 5 mm gap with a 5 mm line of light — the edge position is averaged, not sampled at a point.
Beam turned 90° inside a fixture
LER-95W in a 6 mm head, 20 mm to the part, fiber routed along the fixture body.
Long-distance presence on a wide conveyor
Standard unit plus LK9: 20 mm spot at 1500 mm, mounted 1.5 m above the belt.
Industries
- Semiconductor
- Printing and converting
- Packaging
- Machine tools
Technical specifications
| Type | Special-geometry diffuse fiber units and screw-on focusing lenses |
|---|---|
| Amplifier | LE or LG series |
| Fiber length | 1 m standard; 1000 / 2000 mm to order |
| Available geometry | Side-view 90° head · flat head 6 × 20 mm · 16-core bundle · bare fiber |
| Lens types | LK2 / LK3 (Ø5 mm) · LK4 (Ø9 mm) · LK9 (Ø6 mm) · LFC-5H / LF1-5H (flat, right-angle) |
| Lens mounting | M3P0.5 thread on the unit tip |
| Ambient temperature | −50 to +70 °C |
| Customisation | Head shape, fiber length and jacketing to order |
Dimensions
| Item | Value |
|---|---|
| LER-95W head | 6 mm flat head, beam exits at 90° to the fiber |
| LEU-1220 head | 20 × 6 mm flat, 3.5 mm thick |
| LEU-1230 head | 30 × 6 mm flat, 3.5 mm thick |
| Lens thread | M3P0.5, 10–27 mm overall length |
| Mounting | Clamp the head, or the M3 thread on the lens/unit |
A focusing lens trades distance for spot size: LK2 gives a 5 mm spot at 10 mm, LK9 a 20 mm spot at 1500 mm. Choose the spot first, then read the distance off the lens.
Wiring & output
| Core | Colour |
|---|---|
| 2 | Blue |
| 3 | Black |
| 4 | White |
How to specify
- 01
What shape does the space allow?
A 6 mm flat head under a wafer, a 90° head beside a vertical surface, a Ø9 mm lens on a standard M3 unit. The head geometry, not the optics, usually decides the part number.
- 02
One point or a line
LEU-1220C-05 and LEU-D520C-05 bundle 16 × Ø0.25 mm cores into a 5 mm line — for the edge of a sheet rather than a dot on it.
- 03
Spot size with a lens
LK3 gives a 5 mm spot at 20 mm; LK4 a 10 mm spot at 20 mm with a Ø9 mm body. A lens also collects more light, so it extends the sensing distance of the same unit.
- 04
Custom geometry
Head shape and fiber length can be made to order — send the fixture drawing rather than bending a standard unit into a radius it was not built for.
Why this series
Geometry as the starting point
A 6 mm flat head goes where a Ø3 mm barrel cannot: under a wafer, between two plates, inside a 5 mm gap.
16-core bundles for a line
A single 5 mm wide line of Ø0.25 mm cores detects the edge of a sheet or a web without a scanning mechanism.
Lenses that extend the distance
LK9 puts a 20 mm spot 1500 mm away from an ordinary diffuse unit — the cheapest way to reach across a wide conveyor.
Made to order
Head shape, jacket and length are custom items; a drawing is enough to quote.
Questions
Can a lens be fitted to any unit?
To any unit with an M3P0.5 thread — the threaded LERE / LERS / LETA types. The plain LEWY tips have no thread.
Does a lens change the sensing distance?
Yes. A lens collimates or focuses the beam, so LK9 reaches 1500 mm where the bare unit reaches 50 mm — at the cost of a 20 mm spot.
How long does a custom head take?
Send the drawing: head shape, fiber length and jacket. Custom geometry is quoted per drawing, not from a list.
Need a quotation for Special Fiber?
Send your application details or the guard opening dimensions and we will specify the right model and configuration for your machine.