High Precision H-K9L Glass Double Convex Spherical Lens for DLP/LCD Projector Optics

Material & Core Properties:
This lens is manufactured from H-K9L optical glass, a Chinese optical grade equivalent to Schott N-BK7. This crown glass is selected for its excellent combination of properties crucial for projection:

• High Transparency & Low Absorption: Provides exceptional light transmission (approx. >92% per 10mm thickness in the visible spectrum) from 350nm to 2000nm, minimizing light loss and heat buildup.

• Excellent Homogeneity & Stability: The material features high uniformity in refractive index, ensuring consistent performance across the entire lens aperture and preventing image distortion. It offers good chemical and physical stability for long-term reliability.

• Precision Optical Surfaces: Both convex spherical surfaces are ground and polished to high levels of accuracy (typically to λ/4 surface figure or better), with tight tolerances on focal length and centration to maintain sharp, aberration-free image projection.

• Custom Anti-Reflective Coating: Available with broadband AR coatings optimized for the visible spectrum (e.g., 420-680nm), significantly reducing reflections to enhance contrast and maximize system luminous efficiency.

Primary Function:
As a positive, symmetrical converging lens, its core function within projector optics is collimation and focusing. It is specifically designed to:

• Collimate Light: Take diverging light from the projector's light source (LED or lamp) or illumination integrator and produce a parallel beam.

• Focus Imaging Light: Precisely focus the modulated light from the DLP DMD (Digital Micromirror Device) or LCD panel onto the projection screen, ensuring a sharp, high-resolution image with minimal chromatic aberration.

Key Applications:

• DLP/LCD Projector Engines: A fundamental element in the projection lens assembly for home theater, business, education, and commercial projectors.

• Digital Projection Systems: Used in 3D printing (DLP-based), lithography, and heads-up displays (HUDs).

• Illumination Condensing Systems: Efficiently collects and directs light in the projector's illumination path towards the imaging panel.