Surface Figure
Surface form tested by interferometry — PV/RMS values from the actual measurement.
OEM Make-to-Print · Rod Lenses
Rod Lenses for ENT / Sinuscopes — Φ2.7–4.0 mm (typical), per drawing
One rod with centration error softens the picture at the eyepiece. We measure centration per ISO 10110-6 and put the value 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 — relay rods, slim rods and uncoated blanks.
Material and coating are confirmed from your drawing; standard options include BBAR 400–700 nm and 40/20 surface quality, with NDA before sharing drawings.
The Problem
Four reasons ENT scope builds stall
Short scopes, medium rods — the failure modes are the same, and they all start at the supplier's bench.
1 · The relay train decides the image. ENT scopes are short, but the relay still has to pass the image cleanly — one rod with centration error and the picture softens at the eyepiece.
How HSD avoids it: centration is verified on a per-batch sampling plan per ISO 10110-6, with measured values on the batch COA.
2 · Fit is a package deal. Diameter, length and centration have to come from one consistent set, or assembly tolerances stack up against you.
How HSD avoids it: batch rods are finished from the same drawing package with the same tolerances throughout.
3 · The “manufacturer” may be a trader. Nobody can own a root cause when drawings are spread across shops.
How HSD avoids it: we are the factory — a 30-person precision optical workshop in Nanjing; engineers review your drawing directly.
4 · Traceability is a compliance question. Medical programs need batch numbers and measured values, not pass/fail claims.
How HSD avoids it: every batch COA carries measured values plus material certificates.
ENT builds go smoother when the rod set is one system: one tolerance package, one measurement method, one COA format.
Rod Lens Photos
Real rod lenses from our shop floor
Production photos in the diameter range used for ENT optics, labeled by diameter. Final specifications per your drawing.
Φ2.78 mm
Φ2.65 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.
No drawing, no spec commitment. Send the drawing and we will confirm what we can hold; if it is outside our process, you will hear that too.
Specifications
ENT relay specs — drawing first, site-wide tolerances behind them
| Item | Specification |
|---|---|
| Rod lens diameter range | Φ1.19–8.0 mm (ENT relay rods typically Φ2.7–4.0) |
| 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 ENT rods, we report centration and surface data per batch instead of a pass/fail line, so your incoming inspection has real numbers to check.
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, slim rods, rear rod lenses and uncoated blanks.
What rod lens diameters can you make for ENT endoscopes?
Φ1.19–8.0 mm overall; ENT relay rods are typically Φ2.7–4.0 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 ENT rod lens drawing? Make-to-print, quote within 24 hours.
If an ENT relay drawing is on your desk, send it over; engineering will confirm what we can hold and quote within 24 hours.
Send Your Drawing → Email [email protected]Application context
ENT and sinuscope relays: slim diameters, short steps
ENT and sinuscope rod lenses use slim diameters, typically Φ2.7–4.0 mm, with short relay steps for angled or narrow optical trains. This page is the make-to-print route for those drawings.
Check on the drawing: slim diameter, short relay step and any angled interface; the build type is confirmed before production.
What should I send for an ENT relay rod?
The drawing with diameter, relay length and centration target. Engineering reviews it and confirms feasibility 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
Striation defect caught on an ENT rod surface — PV 1.14λ.
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