Compact Camera Module Spacer Ring Segmentation for Lens Size Reduction
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Solution Overview
Problem
Conventional compact camera modules face challenges in reducing lens size due to design considerations like longer focus length or larger optical device sizes, which lead to increased spacer ring openings, causing light scattering and image quality reduction.
Innovation Solution
A compact camera module is fabricated using a wafer level packaging process with a back spacer ring aligned to an image sensor device package and a front spacer ring sandwiched between the back spacer ring and an optical lens plate, allowing for a smaller lens size and improved image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a larger opening is formed through the spacer ring to accommodate longer focus length or larger optical device size, then the optical performance is improved, but the lens die size cannot be reduced
Solution Approach 1:
The spacer ring is divided into two separate components: a first spacer ring and a second spacer ring. The first spacer ring has a first opening for receiving the optical device, and the second spacer ring has a second opening for receiving the lens. This segmentation allows independent optimization of each opening size, enabling the lens opening to be smaller while maintaining adequate space for the optical device through the first opening.
Solution Approach 2:
The first spacer ring acts as an intermediary structure between the substrate and the second spacer ring. It provides structural support and defines the first opening for the optical device, while allowing the second spacer ring to define a separate, smaller second opening for the lens. This intermediary structure resolves the conflict between needing space for optical devices and reducing lens size.
2Object-affected harmful factors
If a larger opening is formed through the spacer ring, then light scattering effects are prevented, but image quality is reduced due to light shielding by the spacer ring
Solution Approach 1:
By segmenting the spacer ring into two separate rings with distinct openings, the first spacer ring can be optimized to prevent light scattering around the optical device while the second spacer ring can be minimized to reduce light shielding for the lens. This allows simultaneous optimization of both light scattering prevention and image quality.
3Productivity
If the lens die size is reduced, then more optical lens units per wafer are produced reducing fabrication costs, but the spacer ring opening must be reduced which causes light scattering
Solution Approach 1:
The segmentation of the spacer ring system allows the second spacer ring opening to be reduced proportionally with the lens size while the first spacer ring maintains an adequate opening for the optical device. This enables smaller lens die sizes for higher wafer yield without causing light scattering issues, as each component has its own appropriately sized opening.
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
This approach enables a smaller lens size, reducing fabrication costs and increasing the reliability of the camera module by allowing more optical lens units per wafer and ensuring reliable bonding of the optical lens package unit to the image sensor device package.
Implementation Method 1
A first edge of the back spacer ring is aligned to a second edge of the image sensor device package. A third edge of the front spacer ring is aligned to a fourth edge of the optical lens plate
Implementation Method 2
a larger sized opening formed through the spacer ring is needed to prevent light scattering effects during module lamination processes
Data Source
AI summary
The invention provides a compact camera module and a method for fabricating the same. A compact camera module includes an image sensor device package. A back spacer ring is disposed on the image sensor device package. A first edge of the back spacer ring is aligned to a second edge of the image sensor device package. An optical lens plate disposed over the back spacer ring. A front spacer ring is sandwiched between the back spacer ring and the optical lens plate. A third edge of the front spacer ring is aligned to a fourth edge of the optical lens plate.