D-Cut Optical Lens Edge Apodization for Flare Suppression
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Solution Overview
Problem
The D-cut lens in camera modules experiences flare and ghost phenomena due to light reflection, which are not effectively addressed by existing designs.
Innovation Solution
An optical lens with an apodization area on its edge, featuring varying light transmittance and a coating that thickens towards the edge, reducing diffraction effects and preventing flare and ghost phenomena.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a D-cut lens with straight parts is used to reduce module height or Fno, then the camera module size is reduced, but flare and ghost phenomena occur due to light reflection
Solution Approach 1:
The patent applies an apodization coating with spatially varying optical density to specific regions of the lens, particularly at the straight parts where flare and ghost occur. The coating density increases from the center toward the edge, creating local quality variations that selectively attenuate reflected light paths responsible for flare while preserving central image quality.
Solution Approach 2:
The apodization coating modifies the optical properties of the lens by introducing a gradient in light absorption characteristics. The coating transitions from transparent at the center to increasingly opaque at the edges, effectively changing the optical density distribution to suppress flare and ghost phenomena generated by the straight parts of the D-cut lens.
2Reliability
If an apodization area is added to reduce flare and ghost, then image quality is improved, but the device complexity increases
Solution Approach 1:
The patent modifies the optical parameters of the existing lens by applying an apodization coating with a specific optical density gradient. This changes the light transmission characteristics of the lens without altering its physical structure, thereby improving image quality while avoiding the complexity of redesigning the lens shape or adding mechanical components.
Solution Approach 2:
The apodization coating serves as an intermediary layer between the lens and the light it transmits. This coating mediates the interaction by selectively absorbing reflected light paths that cause flare and ghost, while allowing primary light paths to pass through, thus improving image quality without modifying the lens itself.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The apodization area effectively minimizes flare and ghost occurrences by controlling light transmittance and diffraction, enhancing image quality in camera modules.
Implementation Method 1
an apodization area for reducing a flare phenomenon is disposed in an edge adjacent to the straight part of the optical lens
Implementation Method 2
The apodization area may include a plurality of areas having different light transmittances. The apodization area may be formed to have a lower light transmittance as it travels toward an edge.
Data Source
AI summary
The present invention relates to an optical lens comprising at least one straight part and at least one curved part on the outer surface thereof, in which an apodization area for reducing a flare phenomenon is disposed at an edge adjacent to the straight part. The optical lens has the advantage of reducing flare and ghosting phenomena due to a diffraction effect of the apodization area in the edge region.