Code | Material | AR Coating | Diameter-mm | Focal Length (EFL-mm) | Back Focal Length (BFL-mm) | Radius of Curvature (R1-mm) | Center Thickness (Tc-mm) | Edge Thickness (Te-mm) |
---|---|---|---|---|---|---|---|---|
DCX020 | H-K9L (BK7) | Uncoated | 12.85 | f20.00 | 18.99 | 20.15 | 3.00 | 0.90 |
Uncoated Double-Convex Lenses
These uncoated Double-Convex Lenses are characterized by a positive focal length and consists of two convex surfaces of equal radius, and made from N-BK optical glass.
N-BK7 is probably the most commonly used optical glass for the production of high-quality optical components, which is almost the most economical material to choose when the additional advantages of ultraviolet fused quartz (high transmittance and lower coefficient of thermal expansion all the way up to the UV band) are not required.
They are often used in image ultimate systems and finite conjugate imaging systems. The greater the conjugation ratio is, the greater the aberration appears.
Tc---------- Center Thickness
Te---------- Edge Thickness
R1---------- Radius
Dia---------- Diameter
H'-------------- Principal Point
BFL ---------- Back Focal Length
EFL ---------- Effective Focal Length
f'--------------- Focus
The Focal Length of each lens can be calculated using the simplified thick lens formula:
f=(R1×R2)/(n-1)×(R2-R1)
Where n is the refractive index and R is the radius of curvature of the lens surface.
1 | 2 |
---|---|
Center Thickness Tolerance | ±0.2mm |
Surface Irregular Accuracy | λ/4 @632.8nm |
Centering Tolerance | <3 arcmin |
Bevelling | <0.2×45° |
1 | 2 |
---|---|
Design Wavelength | 587.6nm |
Focal Length Tolerance | ±2% |
Diameter Tolerance | +0.0/-0.1mm |
Surface Quality | 40/20-60/40 |
Double-Convex Lenses are commonly used in many finite imaging applications. This type of lens is best used when the object and image are on either side of the lens and the ratio of the distance to the object (conjugate ratio) is between 0.2 and 5.
Double-Convex Lenses can also be double coated with AR Coating
- -A: AR@400-700nm,
- -B: AR@650-1050nm,
- -C: AR@1000-1650nm,
anti-reflection coating can reduce the reflectivity of each surface of the lens.
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