A meniscus lens is a concave-convex lens. This lens features one convex surface and one concave surface. Meniscus lenses can be either positive or negative. A negative meniscus lens is thinner at the center than at the edges, while a positive meniscus lens is thicker at the center than at the edges. Meniscus lenses can correct aberrations and are commonly used as corrective lenses. They can also serve as condensers in illumination systems and, with the appropriate thickness, can help eliminate chromatic aberration.
Aberration Correction: Meniscus lenses are often used to correct aberrations in optical systems, thereby improving image quality.
Condensers: In illumination systems, meniscus lenses can be used as condensers to focus light.
Chromatic Aberration Elimination: By selecting the appropriate thickness, meniscus lenses can eliminate chromatic aberration, enhancing the optical performance of the lens.
Meniscus lenses have a wide range of applications in various fields, including:
1. Photography Systems: Meniscus lenses are often used in conjunction with doublet lenses for collimated imaging.
2. Objective Systems: In objective systems, meniscus lenses are used to focus or disperse light.
3. Laser Measurement Systems: Meniscus lenses are also commonly found in laser measurement systems, where they are used to extend the focal length of optical systems and project light.
4. Focal Length Extension in Optical Systems: By combining biconcave lenses, the focal length range of optical systems can be effectively extended, making them suitable for various optical instruments and devices.
Specifications | Commercial spec. | High precision spec. |
Material | UV glass (quartz, fused silica) | |
VIS glass (Schott, CDGM, HOYA，etc.) | ||
Diameter | Ø5mm~Ø600mm | |
Diameter tolerance | ±0.1mm | ±0.05mm |
Focal length tolerance | ±2% | ±1% |
Surface quality | 60/40 | 40/20 |
Centration | < 3 arc min | <1arc min |
Surface figure | 3λ | 2λ |
Surface irregularity | 1/4λ | 1/10λ |
Clear aperture | >85% of dia | >90% of dia |
Bevel | <0.2mm x 45deg | <0.1mm x 45deg |
Coating | Up on clients’ request | |
Type No. | Diameter | Focal length | Back focal length | Radius of curvature | Radius of curvature | Center thickness | Edge thickness |
φD( mm) | f( mm) | fb( mm) | r1( mm) | r2( mm) | Tc( mm) | Te( mm) | |
BK7-25.4-100 | 25.4 | 100 | 95.9 | 32.1 | 82.2 | 3.6 | 2.0 |
BK7-25.4-150 | 25.4 | 150 | 146.3 | 49.1 | 131.6 | 3.1 | 2.0 |
BK7-25.4-200 | 25.4 | 200 | 196.5 | 66.2 | 182.2 | 2.8 | 2.0 |
BK7-25.4-300 | 25.4 | 300 | 296.5 | 100.9 | 288.2 | 2.5 | 2.0 |
Type No. | Diameter | Focal length | Back focal length | Radius of curvature | Radius of curvature | Center thickness | Edge thickness |
φD( mm) | f( mm) | fb( mm) | r1( mm) | r2( mm) | Tc( mm) | Te( mm) | |
BK7-25.4-100 | 25.4 | -100 | -98.7 | 100 | 33.7 | 3.0 | 4.5 |
BK7-25.4-150 | 25.4 | -150 | -148.0 | 100 | 43.1 | 3.0 | 4.1 |
BK7-25.4-200 | 25.4 | -200 | 197.3 | 100 | 50.2 | 3.0 | 3.8 |
BK7-25.4-500 | 25.4 | -500 | -496.3 | 250 | 126.3 | 3.0 | 3.3 |
English
русский
