Meniscus lens is divided into positive and negative lunar lenses.One side of a meniscus lens is convex and the other side is concave. It can be a convergent lens or a divergent lens, determined by the refractive index, curvature, and radius together. Widely used in photography systems, projection systems, imaging systems, optical viewfinder, and laser measurement systems.
Positive Meniscus Lens:
This lens is used in applications requiring a short focal length (typically less than 2.5). For focal lengths between 2.5 and 10, positive meniscus lenses are ideal for reducing spot size and improving image quality. In this type, the concave surface has a smaller curvature (less steep), and the convex surface has a larger curvature (more steeply curved).
Negative Meniscus Lens:
These lenses are suitable for use with high-refractive-index infrared materials. They serve as an alternative to conventional negative lenses with steep concave surfaces and shallow convex curves. Negative meniscus lenses are commonly used in beam expansion systems where minimizing spherical aberration is critical.
| Materials | Optical glass, quartz, infrared materials (calcium fluoride, zinc selenide, silicon, germanium) |
| Diameter Range | φ1-450mm |
| Contour tolerance | 0/-0.1 |
| Thickness Tolerance | ±0.03 |
| Surface Quality | 20-10 |
| Surface Flatness | N≤1, △N≤0.2 |
| Center | 15 seconds |
| Chamfer | ≤0.1 |
| Clear Aperture | > 90% |
| Coating | According to customer requirements |
We follow a step-by-step process and conduct rigorous quality checks throughout the process.
Optical Design: Work with our engineers to validate your print or rely on our expertise to get your design just right. We'll recommend the right optical material and send it off to production.
Crown and flint fabrication: we'll use materials with lower dispersion for convex crowns and higher dispersion materials for concave flints.
Optical alignment and assembly: After the optical and mechanical axes have been accurately aligned, the lenses are bonded together using specialised refractive index optical adhesives. UV-cured optical adhesive is then used.
Centring: After assembly, some doublet lenses are centred to their final diameter, while others are pre-centred before gluing. After assembly, the bimodal lenses can also be darkened to reduce scattering, which is useful in some optical applications.
Tests and Measurements: Interferometry, surface roughness, radius of curvature, aberration, etc.
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