Surface Figure
Surface form tested by interferometry — PV/RMS values from the actual measurement.
OEM Make-to-Print · Rod Lenses
Rod Lenses for Arthroscopes — Φ4–5 mm (typical), per drawing
In a tight arthroscope bore, there is no room for a rod a fraction of a hundredth over. We hold −0.02/−0.04 mm and measure it on the batch COA. Send the drawing and get a fit check within 24 hours.
We are a make-to-print manufacturer: you send the drawing, we make the rod lenses — from Φ1.19 mm to Φ8.0 mm.
Glass and coating follow your drawing; typical options are BBAR 400–700 nm and 40/20 surface, and we sign an NDA before technical files are shared.
The Problem
Four reasons arthroscope builds get stuck
Φ4–5 mm relay rods, tight bores, short train — fit and centration decide the build.
1 · Fit decides whether the tube closes. In a tight arthroscope bore there is no room for a rod that is a fraction of a hundredth over.
How HSD avoids it: diameter is held to −0.02/−0.04 mm and measured on the batch COA.
2 · Centration decides the image. A small centration error on one relay rod shows as a soft or shifted image in the assembled scope.
How HSD avoids it: centration is verified on a per-batch sampling plan per ISO 10110-6, with measured values on the COA.
3 · The “manufacturer” may be a trader. Several shops in the chain means no one owns a yield problem.
How HSD avoids it: we are the factory — your drawing is reviewed by our own engineers, not forwarded.
4 · Batch drift surfaces at final assembly. A “within spec” COA hides the drift until the scope fails.
How HSD avoids it: every batch COA carries measured values — dimensions, centration, surface, method.
Arthroscope builds work when the relay rods arrive as a matched set — same tolerances, same method, same COA format.
Rod Lens Photos
We don't show a dedicated photo set for arthroscope rods yet — send your drawing and our engineers confirm every dimension, tolerance and assembly relation against your print.
Arthroscope rods live or die by fit. Send the drawing and we will confirm the diameter and length package before production.
Specifications
Arthroscope relay specs — fit first, then tolerance
| Item | Specification |
|---|---|
| Rod lens diameter range | Φ1.19–8.0 mm (arthroscope relay rods typically Φ4–5) |
| Diameter tolerance | −0.02 / −0.04 mm (fit) |
| Centration | ≤3′, tighter per drawing |
| Surface quality | 40/20 · MIL-PRF-13830B / ISO 10110-7 5/40-20 |
| Edge chipping | ≤0.05 mm, per drawing · ISO 10110-7 E 0.05 |
| Coating | BBAR 400–700 nm, R<0.5% (per drawing) |
| Glass | Per drawing: JGS1 / H-ZF / H-LAK / H-K9L / N-SK15; material certificates with each batch |
| Length tolerance | Per drawing |
In-house production
Why you can check us
On arthroscope relays, we put measured centration and surface data on the COA, so your QC does not have to trust a stamp.
ISO 9001:2015 quality system
In-house since 2009 — no reselling
Measured COA per batch
NDA standard before drawings
24-hour engineer quote
MOQ 10 · glass never substituted
FAQ
Common questions
Are you a make-to-print manufacturer?
Yes. You send the drawing, we make the rod lenses — relay rods, rear rod lenses and uncoated blanks.
What rod lens diameters can you make for arthroscopes?
Φ1.19–8.0 mm overall; arthroscope relay rods are typically Φ4–5 mm. Final diameter and length per your drawing.
What centration can you hold?
≤3′ on rod lenses, tighter if the drawing asks for it. The COA carries measured values, not a within-spec statement.
What's on the COA?
Part number and revision, measured diameter and thickness, measured centration, surface quality and test method. Numbers — not PASS.
What's the MOQ and how fast is a quote?
MOQ 10. Quote within 24 hours of drawing confirmation; samples and production run on the same tolerances and the same process.
Have an arthroscope rod lens drawing? Make-to-print, quote within 24 hours.
If your arthroscope relay drawing is ready, send it over; engineering will confirm fit, tolerances and price within 24 hours.
Send Your Drawing →Email [email protected]Application context
Why arthroscope relays need a proven Φ4–5 mm pairing
Arthroscope relay rods typically run at Φ4–5 mm because the tube cross-section must carry both the relay train and working channels. This page is the make-to-print route for those drawings: rod diameter, length, centration and surface quality are confirmed before production.
Check on the drawing: relay length, working diameter, surface quality and whether the rod is a single or cemented build.
How should I spec an arthroscope relay rod?
Send the drawing with target diameter, relay length, centration and surface quality. We confirm the make-to-print process within 24 hours.
Inspection & Metrology
We measure it — and the numbers go on your COA.
Every batch is verified with interferometry, centration measurement and surface inspection. You get the actual measured values, not a “within spec” checkbox.
Centration
Centration checked on the centration station, typically ≤3′. The reading shown is from a real part — 2.02′.
Surface Quality
Surface and edge quality inspected under a video microscope — scratch/dig per MIL-PRF-13830B.
What “Pass” Looks Like
A passing surface from a production run: PV 0.51λ, RMS 0.059λ. Rejects never leave the workshop.
Measured COA per batch — ask for a sample COA with your quote. · Learn how to read a surface map →
Real inspection record from this product line
Diagonal scratch band caught in inspection — PV 2.867λ.
Real measurement, kept on file. Your COA gets the same kind of data.
See the Factory Live — Schedule a Video Tour
Watch rod lens grinding, polishing, centration measurement and final inspection in real time. All information shared during the tour is confidential — your NDA is welcome.
Schedule a Live Video Tour