Overview
EN ISO 14880-3:2024 (CEN endorsement of ISO 14880-3:2024) defines standardized test methods for optical properties of microlenses in microlens arrays other than wavefront aberrations. It applies to arrays of very small lenses formed on one or more surfaces of a common substrate and to graded‑index microlenses. This second edition updates and replaces the 2006 version and is intended for adoption by CEN member bodies.
Key topics and technical requirements
- Scope and exclusions
- Specifies tests for optical parameters other than wavefront aberrations (those are covered in ISO 14880‑2).
- Applicable to substrate-mounted and graded‑index microlenses.
- Substrate testing
- Requires quantification of substrate optical quality in accordance with ISO 10110‑5 (surface form tolerances).
- Microscope test method
- Principle: locate the microlens surface optically and determine the effective back/front focal length by measuring the axial displacement to the focal position.
- Details on measurement arrangement, test equipment and general setup.
- Measured parameters
- Effective focal length (back/front)
- Chromatic aberration
- Uniformity of focal spot positions
- Coupling efficiency and imaging quality (discussed and reported)
- Procedure, results and uncertainty
- Step‑by‑step measurement procedures, reporting requirements and considerations for measurement uncertainty.
- Informative annexes
- Annex A: use of wavefront measuring/interferometric systems (alternative techniques)
- Annex B: confocal measurement of effective focal length
- Annex C: coupling efficiency and imaging quality guidance
- Annex D: measurement of focal spot positions using Shack–Hartmann techniques
- Documentation
- Required content for a comprehensive test report.
Applications
EN ISO 14880-3:2024 is practical for:
- Quality control and acceptance testing of microlens arrays used in:
- 3D displays and near‑eye optics
- Arrayed light‑source coupling and photodetector interfaces
- Enhanced LCD backlighting and imaging sensors
- Optical interconnects and parallel optical processors
- R&D validation of graded‑index microlenses and micro‑optics prototypes
- Characterization of focal spot uniformity and coupling efficiency for system integration
Who should use this standard
- Optical manufacturers and micro‑optics fabricators
- Metrology and testing laboratories
- Optical designers and systems engineers integrating microlens arrays
- Procurement, QC and compliance teams requiring standardized test evidence
Related standards
- ISO 14880‑1 - Vocabulary and definitions for microlens arrays
- ISO 14880‑2 - Wavefront aberrations (complementary test suite)
- ISO 10110‑5 - Surface form tolerances (substrate requirements)
EN ISO 14880‑3:2024 provides a practical, harmonized test framework for reliable characterization of microlens optical performance - essential for interoperability, supplier comparability and product qualification.