Precision-engineered double convex lens with ultra-tight tolerances
for demanding optical applications in imaging, lighting, and laser
systems.
Frequently Asked Questions
Why is a ±0.005mm diameter tolerance critical for multi-element
systems?
In complex optical assemblies, such as high-resolution imaging
objectives, even a slight mechanical tilt or decentration can lead
to significant coma and astigmatism. A ±0.005mm tolerance ensures a
"press-fit" precision within the lens barrel, eliminating the need
for manual alignment (shimming) and ensuring that the optical axis
of the DCX lens remains perfectly centered.
How do you maintain focal length consistency within ±1%?
Focal length is a function of both the surface radii and the center
thickness (CT). By controlling the Center Thickness to ±0.01mm and
utilizing high-precision CNC polishing to maintain radius
consistency, we ensure that the effective focal length (EFL)
remains stable. This is vital for industrial sensors where
consistent magnification is required across thousands of units.
What are the challenges of polishing Double Convex lenses with a
small radius (R0.8mm)?
Small radii create steep surface slopes, which are difficult to
polish uniformly. We utilize Sub-aperture Polishing and
custom-tooled diamond abrasives to ensure that the surface accuracy
(N=1~3) and irregularity (ΔN=0.1~0.5) are maintained right up to
the clear aperture, preventing "edge roll-off" which can degrade
peripheral image quality.
How do you verify the surface irregularity (ΔN) on a symmetric DCX
lens?
We use He-Ne Laser Interferometers (such as Zygo) to capture the
phase-shift map of both convex surfaces. For a DCX lens, each side
is tested individually against a reference sphere. A ΔN value of
0.1 indicates that the local deviation from the ideal spherical
shape is less than 1/10 of a fringe, guaranteeing a near-perfect
wavefront.
Can you provide "Scratch-Dig 10/5" for high-power laser
applications?
Yes. For laser-grade DCX lenses, we offer 10/5 Surface Quality.
This extreme level of polishing removes micro-defects that could
otherwise act as absorption centers, potentially leading to
laser-induced damage (LIDT). This is essential for focusing
high-peak-power pulses in industrial laser cutting and medical
surgery.
Which substrate should I choose for a DCX lens in a
high-temperature environment?
If the system is subject to thermal shock, Sapphire or Fused Silica
are the preferred choices. Sapphire offers a high thermal
conductivity and a Mohs hardness of 9, while Fused Silica provides
a near-zero coefficient of thermal expansion (CTE). For standard
visible imaging, BK7 (K9) remains the most cost-effective solution
due to its excellent homogeneity and chemical resistance.
Do you offer custom Anti-Reflection (AR) coatings for these
high-precision lenses?
Absolutely. We provide custom thin-film deposition based on your
target wavelength. Options include V-Coats for single laser lines
(R < 0.1%) and Broadband AR (BBAR) for wide-spectrum imaging.
Each shipment includes a spectrophotometer curve to verify the
coating's performance.
12MP Manual Aperture C-Mount Optical Glass Lens 1.1 Inch Industrial Vr Camera Lenses
