Surface Figure
Surface form tested by interferometry — PV/RMS values from the actual measurement.
OEM Make-to-Print · Rod Lenses
Rod Lenses for Spine / Nephroscopes — Φ4–7 mm (typical), per drawing
A long train multiplies a small centration error; by the last relay the image is visibly off. We measure centration per ISO 10110-6 on every batch and record it on the COA. Send the drawing and get the review 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.
Your drawing decides glass and coating; our standard building blocks are BBAR 400–700 nm, 40/20 surface and NDA before technical files are shared.
The Problem
Four things that break a long optical chain
Spine and nephroscope trains are long — more relays means more chances for error to stack.
1 · Error stacks across many relays. A long train multiplies a small centration error; by the last relay the image is visibly off, and no single part looks wrong.
How HSD avoids it: centration is verified on a per-batch sampling plan per ISO 10110-6, with measured values recorded on the COA.
2 · Length is part of the optical design. Relay spacing is set by rod length per drawing; a drift moves the image plane and shows up at assembly.
How HSD avoids it: length and diameter are measured per batch and logged against the drawing.
3 · The “manufacturer” may be a trader. With several shops in the chain, a yield problem has no owner.
How HSD avoids it: we are the factory — your drawing is reviewed by our own engineers, not forwarded.
4 · A bad batch has to be traceable. Long trains mean many parts in one scope; without measured values you can't say which rod drifted.
How HSD avoids it: every batch COA carries measured values — dimensions, centration, surface, method.
A long chain only works when every batch is measured the same way — same tolerances, same method, same COA format.
Rod Lens Photos
Real rod lenses from our shop floor
Production photos in the diameter range used for spine/nephroscope optics, labeled by diameter. Final specifications per your drawing.
Φ6.52 mm
Φ5.96 mm
Scope of supply: relay rods · slim relay rods (Φ1.19–1.96) · rear rod lenses (Φ6 class) · special diameter/length rod lenses · uncoated rod lens blanks — all make-to-print per your drawing.
A long train only works when every batch is measured the same way. Send the drawing and we will confirm tolerances before we start.
Specifications
Spine / nephroscope relay specs — per drawing, same measurement method
| Item | Specification |
|---|---|
| Rod lens diameter range | Φ1.19–8.0 mm (spine/nephroscope relay rods typically Φ4–7) |
| 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
For spine and nephroscope trains, the useful thing on the COA is not a stamp; it is the measured centration and length per batch.
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 spine endoscopes?
Φ1.19–8.0 mm overall; spine/nephroscope relay rods are typically Φ4–7 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 a spine or nephroscope rod lens drawing? Make-to-print, quote within 24 hours.
Have a spine or nephroscope rod drawing? Send it and engineering will review the full relay set within 24 hours.
Send Your Drawing →Email [email protected]Application context
Spine and nephroscope relays: larger diameters, multi-element builds
Spine and nephroscope relays typically run at Φ4–7 mm and often use multi-element builds. This page is the make-to-print route for those larger relay rods.
Check on the drawing: larger diameter, relay length and element count; multi-element builds are confirmed before production.
What do spine and nephroscope relays share?
Larger cross-section and multi-element options. The drawing decides the build; we confirm it before production.
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
Spoke defect caught on a nephroscope rod surface — PV 4.325λ.
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