Overview

A precision aperture plate for drone cameras is a thin, light-tight metal disc carrying a single accurately sized opening placed between lens elements or in front of the sensor, where it sets the light bundle, blocks off-axis stray light and controls flare and vignetting. Etched apertures are made from 0.02–0.5 mm 304/316L stainless steel, nickel or Kovar, with hole diameter held to ±0.005 mm and blackened or matte-finished walls to suppress reflection. Because the hole is imaged in photoresist and the metal dissolved chemically, edges are clean, roundness is tight and no burr scatters light.

Specifying a precision aperture plate for drone cameras through photochemical etching meets the four demands of light weight, thin stock, tight geometry and a black non-reflective bore at once: stamping rolls thin material, drifts as the die wears and leaves bright sheared walls; laser drilling adds a heat-affected zone and pale rims with poor batch consistency; machining cannot reach consumer-drone cost. Etching defines the hole on film and holds wall verticality with time, temperature and conveyor speed, so every plate on a panel shares the same diameter and position, and a new aperture is a new film. With a stable matte coating, incoming inspection reduces to a diameter and roundness audit on a precision aperture plate for drone cameras.

Parameter Window

• Available Materials: 304/316L stainless steel, nickel, Kovar, copper
• Material Thickness Range: 0.02–0.5 mm
• Tolerance: hole diameter ±0.005 mm, position ±0.01 mm
• Minimum Feature: 0.05 mm hole, roundness ≤0.01 mm
• Surface Options: blackening, matte finish, black oxide, nickel plating, electropolish
• Compliance: ISO 9001 process control, RoHS/REACH material traceability

Manufacturing Process / Workflow (8 Steps)

1. Artwork & DFM Review — Convert the aperture drawing into vector artwork and check diameter, roundness, position and minimum web to the panel edge.
2. Material Selection — Choose 304/316L, nickel or Kovar temper and verify thickness uniformity and surface scratches on ultra-thin stock.
3. Cleaning & Lamination — Degrease and laminate dry-film resist on both faces, ensuring the micro-hole bonds without bubbles.
4. UV Exposure — Expose the hole pattern through high-resolution film registered to a common panel datum.
5. Development — Wash out unexposed resist to open the hole, then inspect each bore for residue before etching.
6. Controlled Etching — Spray chemistry matched to the alloy, holding wall verticality and ±0.005 mm on diameter through time, temperature and conveyor speed.
7. Stripping & Finishing — Remove resist, neutralize, then blacken or matte-finish the walls, counting the coating in the final clear aperture.
8. Inspection & Packaging — Measure diameter, roundness and position against the first article, then pack light-tight and dust-free.

Core Advantages

1. Burr-free edges: Chemical removal leaves no roll-over or burr, so the bore does not scatter light or add diffraction artifacts.
2. Repeatable diameter: Diameter and roundness are defined on film, so flare and ghosting are consistent across every panel.
3. No hard tooling: A new aperture is a new film, keeping multi-model and revision runs economical.
4. Stress-free flatness: No mechanical force means ultra-thin plates stay flat and do not decenter when stacked in a lens barrel.
5. Fine feature capability: Micro-holes hold their shape with vertical walls and no heat-affected distortion.
6. Finish flexibility: Alloys and matte coatings run on one line, so the bore reflectance matches each optical design.

Typical Applications

• Main-lens apertures: Light-bundle stops between aerial camera lens groups.
• Sensor masks: Stray-light shields placed in front of the imaging chip.
• Iris leaves: Thin leaves inside variable-aperture mechanisms.
• Filter retainers: Positioning rings for color filters and cover glass.
• IR-cut windows: Baffles around night-vision module apertures.
• Calibration targets: Standard hole plates for production-line optical alignment.

Design Notes & Process Considerations

1. Tolerance callout: State ±0.005 mm on diameter separately from ±0.01 mm on position to avoid ambiguity.
2. Web versus thickness: Keep minimum web at or above 1.2 × material thickness so thin stock does not lift.
3. Wall reflectance: Specify matte finish and a reflectance limit, since bright walls cause veiling glare in backlit scenes.
4. Flatness and burr: Call out flatness per 100 mm and require burr-free edges to avoid decenter or scratched coatings.
5. Coating thickness: Name the coating and thickness, since it slightly shrinks the clear aperture and affects the f-number.
6. Panelization: Group apertures with shared registration marks and keep a solid border.