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Precision-engineered optics optimized for thread pitch, flank angle, and root geometry measurement in industrial automation.
A bi telecentric lens (also called double-telecentric or object-image telecentric lens) places the entrance pupil at optical infinity on the object side and the exit pupil at optical infinity on the image side simultaneously. This dual-telecentric configuration eliminates perspective error entirely — meaning that even when a measured object shifts axially within the depth of field, its projected image size remains constant.
For precision screw thread gauging, this property is indispensable. Thread profiles — including pitch, flank angle, major diameter, minor diameter, and root radius — must be measured with sub-micron repeatability. Any perspective distortion or magnification change caused by axial displacement would introduce systematic measurement errors that are unacceptable in aerospace, automotive, and medical fastener production.
Bi telecentric lenses from Canrill Optics achieve telecentricity error below 0.05°, distortion below 0.02%, and provide a stable, uniform illumination path that works seamlessly with coaxial LED light sources — enabling clean, high-contrast silhouette imaging of thread geometries at production-line speeds.
Bi telecentric optics ensure the magnification remains constant regardless of axial object position, eliminating the #1 source of dimensional measurement error in thread gauging systems.
Ultra-low geometric distortion preserves the true shape of thread flanks, enabling accurate flank angle and pitch measurement that meets ISO 1 accuracy class requirements.
The telecentric optical path accepts coaxial diffuse illumination, producing sharp, shadow-free thread silhouettes that maximize edge detection accuracy for automated gauging algorithms.
Compatible with high-frame-rate area scan and 16K line scan cameras, Canrill bi telecentric lenses support 100% inline thread inspection at throughputs exceeding 600 parts per minute.
From automotive fasteners to medical implants, bi telecentric lenses are redefining dimensional quality control across critical industries.
Engine bolts, wheel studs, and chassis fasteners require 100% thread gauging at high throughput. Bi telecentric lenses integrated into rotary indexing machines inspect thread pitch, lead angle, and root radius simultaneously — replacing slow manual CMM sampling with real-time pass/fail decisions at the press.
Aerospace-grade threaded components (AN, NAS, MS standards) demand Class 3A/3B tolerance compliance. Bi telecentric vision systems mounted on multi-axis gantries perform full-thread-form analysis — major/minor diameter, pitch diameter, helix angle — with traceability to NIST standards for AS9100 compliance.
Orthopedic bone screws, dental implant fixtures, and spinal cage fasteners are manufactured to ISO 5835 and ASTM F543 standards. The zero-distortion imaging of bi telecentric optics enables measurement of self-tapping thread profiles and cortical thread geometries at the micron level — critical for implant safety and regulatory approval.
PCB mounting screws, M1.0–M3 precision machine screws, and threaded inserts for consumer electronics require gauging at magnifications of 0.5× to 2×. Canrill's compact bi telecentric lenses with C-mount interfaces integrate directly into desktop AOI (Automated Optical Inspection) systems for high-mix, high-volume electronics assembly lines.
API and premium connection threads (VAM, Tenaris, etc.) used in downhole tubulars and casing require precise taper, thread height, and seal surface measurement. Line scan bi telecentric lenses with 82mm focal length cover the large field of view needed for pipe OD inspection while maintaining the telecentric accuracy required for API 5CT certification.
Tap, die, and thread mill manufacturers use bi telecentric metrology systems for tool geometry verification — measuring relief angle, cutting edge profile, and thread form accuracy before tools ship to customers. This eliminates costly production scrap caused by out-of-spec tooling.
The global machine vision market is accelerating — and bi telecentric lenses are at the heart of the next generation of precision gauging systems.
The global machine vision market is projected to exceed $26 billion by 2030, growing at a CAGR of over 7.5%. Thread gauging represents one of the fastest-growing application segments, driven by tightening quality standards in automotive electrification (EV battery module fasteners) and medical device manufacturing. Bi telecentric lenses are increasingly specified as the default optical component for dimensional gauging cells replacing traditional air gauges and CMM sampling.
Modern thread gauging systems pair bi telecentric lenses with AI-powered defect detection algorithms. The distortion-free, consistent image geometry produced by telecentric optics is ideal for training convolutional neural networks (CNNs) to classify thread defects — crossed threads, incomplete threads, burrs, and surface cracks — with accuracy exceeding 99.5%. This AI-optics synergy is enabling zero-defect manufacturing strategies in Tier 1 automotive supply chains.
Bi telecentric vision systems are increasingly embedded directly into CNC threading machines and thread rolling equipment, providing real-time dimensional feedback to the machine controller. This closed-loop gauging approach — where measurement data from the telecentric lens system automatically adjusts tooling offsets — is reducing thread scrap rates by up to 80% in high-volume fastener production facilities adopting Industry 4.0 architectures.
Chinese precision optics manufacturers like Canrill Optics are rapidly closing the technology gap with European and Japanese competitors, offering ISO-certified bi telecentric lenses at 30–50% lower cost. With domestic R&D investment in optical design software, CNC lens grinding, and thin-film coating technology accelerating, China-sourced bi telecentric lenses are now qualified by Fortune 500 manufacturers in automotive, semiconductor, and medical device sectors worldwide.
As fastener sizes shrink — driven by lightweighting in EV platforms and miniaturization in medical devices — the demand for bi telecentric lenses with higher numerical aperture, shorter working distances, and larger sensor compatibility (1.1" and above) is growing rapidly. Canrill's MH Series addresses this trend with lenses designed for 2/3" and 1.1" sensors, enabling higher pixel density and finer thread feature resolution without sacrificing the telecentric accuracy that gauging applications demand.
Increasingly stringent regulatory requirements — IATF 16949 for automotive, FDA 21 CFR Part 820 for medical devices, and NADCAP for aerospace — are mandating 100% dimensional inspection of critical threaded components. This regulatory push is accelerating the replacement of statistical sampling with 100% inline vision-based gauging, creating sustained demand growth for high-performance bi telecentric lens systems that can be validated and qualified within regulated quality management systems.
Every Canrill bi telecentric lens for screw thread gauging passes through a rigorous 7-stage quality assurance process before reaching your production line.
Canrill Quality Management System conforms to the standard of ISO 9001:2015 in the production of industrial telecentric lenses and accessories. Our Quality Dept consists of 13 experienced specialists — more than 13% of total personnel — reflecting the central importance of quality in Canrill's operations.
The Quality Department operates four independent branches: IQC (Incoming Quality Control), IPQC (In-Process Quality Control), QA (Quality Assurance), and OQC (Outgoing Quality Control). Each branch works independently to ensure the excellent optical and mechanical performance of every telecentric lens shipped.
Appearance inspection (no scratches, aberration, white dots or dust), lens cone gap ≤0.1mm, no loose parts, sticker on both lens & box, accessories, desiccant, certificate of qualification, coaxial light verification.
Verification of model name and quantity against purchase orders. All incoming optical and mechanical components are logged and traceable throughout the production process.
Detailed inspection of appearance, specification tolerances, oxidation resistance, and raw material compliance. Only components meeting Canrill's internal acceptance criteria proceed to production.
Qualified and unqualified materials are strictly segregated. All items are labeled with model name and quantity and stored in appropriate packaging to prevent contamination or damage.
Assembly follows BOM lists and engineering drawings strictly. Perfect appearance is verified at each assembly stage — no missing screws, no missing adhesive, no deviation from approved assembly procedures.
Final packaging inspection covers quantity, appearance, sticker placement, accessory completeness, and carton integrity — ensuring every lens arrives at the customer in perfect condition.
Comprehensive optical performance testing: image clarity and resolution, absence of angle ambiguity, working distance verification, telecentricity measurement, and distortion analysis. Every lens is tested against specification before shipment — no exceptions.
Every lens is produced under a fully documented quality management system with 7-stage inspection, ensuring consistent performance batch after batch — critical for long-term production line reliability.
From compact 8mm C-mount lenses for desktop gauging fixtures to 82mm line scan telecentric lenses for large-bore pipe thread inspection, Canrill offers the broadest telecentric lens portfolio from a single China-based manufacturer.
As a direct manufacturer with full in-house optical design, grinding, coating, and assembly capabilities, Canrill eliminates distributor markups — delivering European-quality bi telecentric optics at China factory prices.
Canrill's engineering team provides full custom bi telecentric lens design services — including custom magnification, working distance, sensor format, and mechanical interface — for OEM machine vision integrators and system builders.
Every lens ships with a certificate of qualification, coaxial light source compatibility verification, desiccant, and full accessory kit — ready to integrate into your gauging system immediately upon receipt.
With customers across North America, Europe, Japan, and Southeast Asia, Canrill has established logistics and after-sales support infrastructure to serve global OEM and end-user customers with short lead times and responsive technical support.
Explore our full range of telecentric lenses — engineered for the most demanding thread inspection and dimensional gauging applications.
