Imaging Lens Assembly Light Blocking Sheet Retention
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Solution Overview
Problem
Conventional camera modules face challenges in balancing image quality, sensitivity, aperture size, volume, and field of view, making it difficult to meet diverse requirements for electronic devices equipped with camera modules.
Innovation Solution
The proposed imaging lens assembly includes a plastic barrel and an optical element set comprising an optical lens element, a light blocking sheet, and a light-shielding layer, where the light-shielding layer extends from the optical lens element to the outer diameter surface, forming an annular concave-curved portion to retain the light blocking sheet and prevent relative displacement, optimizing light blocking and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional camera module design is used, then the structure is simple, but it is difficult to balance image quality, sensitivity, aperture size, volume and field of view
Solution Approach 1:
The optical lens element is divided into an effective optical portion and a peripheral portion, with different functional treatments applied to each. The peripheral portion includes an annular side wall that extends parallel to the optical axis, creating distinct functional zones for light gathering and light blocking.
Solution Approach 2:
A light blocking sheet is introduced as an intermediary component between the optical lens element and the imaging sensor. This sheet includes a central opening surface and an annular abutting surface that abuts against the annular side wall, serving as a mediator to block stray light while maintaining the optical path.
2Reliability
If the light blocking sheet is not retained properly, then the structure is simple, but relative displacement occurs between the light blocking sheet and the optical lens element
Solution Approach 1:
The light blocking sheet is merged with the optical lens element through the annular abutting surface that abuts against the annular side wall. This integration ensures positional stability without requiring separate retention mechanisms, as the abutting surface and side wall form a self-retaining structure.
3Object-affected harmful factors
If the light-shielding layer does not extend to the outer diameter surface, then the manufacturing is simpler, but light blocking efficiency is reduced
Solution Approach 1:
The light-shielding layer is applied selectively to specific regions: the effective optical portion, the peripheral portion, and extending to the outer diameter surface. This localized application ensures optimal light blocking efficiency where needed while simplifying manufacturing in other areas.
Data Source
AI summary
An imaging lens assembly includes a plastic barrel and an optical element set. The optical element set includes an optical lens element, a light blocking sheet and a light-shielding layer. At least one surface of an object-side peripheral surface and an image-side peripheral surface of the optical lens element includes an annular side wall. An annular abutting surface of the light blocking sheet and the annular side wall of the optical lens element are disposed correspondingly to each other. The light-shielding layer surrounds a central opening of the light blocking sheet and includes an annular concave-curved portion. The annular concave-curved portion is for retaining the light blocking sheet, so that there is no relative displacement in a direction parallel to an optical axis between the annular abutting surface of the light blocking sheet and the annular side wall of the optical lens element.