Custom Fresnel Glass Lenses
A Fresnel glass lens divides a curved optical surface into concentric or linear facets. This structure provides focusing or collimating power with less bulk than a conventional lens of similar aperture, while molded glass supports lighting systems exposed to heat, weather or long operating periods.
China Lampoptics develops Fresnel lenses around the source, focal requirement and groove prescription. Diameter and focal length identify only the overall lens; groove pitch, facet angle, orientation and the opposite surface determine the actual optical performance.
Fresnel Lens Functions
| Function | Optical result | Typical use |
|---|---|---|
| Collimating lens | Turns divergent source light into a narrower beam | Spotlights, searchlights and signals |
| Condenser lens | Collects light into an optical or projection system | Stage lighting and projectors |
| Focusing lens | Forms a spot or image at a defined distance | Sensors and optical instruments |
| Beam-spreading lens | Uses facet structure to broaden or redistribute light | Area and warning lighting |
| Linear Fresnel lens | Controls light mainly in one axis | Line illumination and elongated fields |
Fresnel Lens Specifications
| Clear aperture | ____ mm |
|---|---|
| Outside diameter / envelope | ____ mm |
| Effective / back focal length | ____ / ____ mm |
| Design wavelength | ____ nm |
| Groove pitch | ____ mm |
| Groove depth | ____ mm |
| Facet prescription | ____ |
| Groove side | Source side / exit side ____ |
| Center / edge thickness | ____ / ____ mm |
| Optical transmission | ____ |
The source position must be referenced to the correct lens surface. Reversing a Fresnel lens or using an undefined mounting offset can change the beam even when focal length is correct.
Groove Molding and Inspection
- Tooling: machine the groove master, outside geometry and mounting features to one coordinate system
- Glass molding: replicate facet angles and groove transitions without incomplete fill
- Annealing: stabilize the molded lens before final measurement
- Profile inspection: measure groove pitch, depth, facet form and clear aperture
- Optical test: confirm focal position or beam output with the defined source
Lampoptics Capabilities
Lampoptics has an optical-lens workshop, mold workshop and experience producing convex, condenser and stage-light glass optics. Coating can be added where required and compatible with the molded surface.
Available Fresnel diameters, groove limits, glass grades and focal tolerances are ____.
Fresnel Glass Lens Processing
Groove Design Review
Focal target, groove pitch, groove orientation, active diameter and source position define the optical tool.
Precision Groove Tooling
The Fresnel structure and mechanical reference surfaces are produced in tooling with controlled concentricity.
Glass Molding and Annealing
The groove pattern is replicated into glass, followed by controlled cooling to stabilize the lens.
Optical and Groove Inspection
Groove fill, defects, focal behavior, dimensions and transmitted beam are checked against the approved sample.
Applications
- Stage and entertainment lighting: condensing and projection optics
- Spotlights and searchlights: large-aperture beam collection
- Traffic, rail and warning lights: signal beam control
- Industrial illumination: heat-resistant focusing or collimating elements
- Optical instruments: compact focusing components
Fresnel Glass Lens FAQs
What is the main advantage of a Fresnel lens?
Its faceted surface provides optical power with less thickness and mass than a conventional full-curvature lens of similar aperture.
Which side should face the light source?
The correct orientation depends on the optical design. The source side and mounting reference must be stated on the drawing.
Can Fresnel grooves be molded in glass?
Yes. Precision tooling and controlled molding reproduce the groove structure; Lampoptics groove capability is ____.
How is a Fresnel lens inspected?
Groove profile and dimensions are checked first, followed by focal or beam testing with a defined source.
Can Lampoptics make a Fresnel lens from a sample?
A sample can support profile reconstruction, but the source, focal requirement and beam acceptance data are still needed for functional approval.
