Imaging Lens Assembly With Reversing Inclined Surface for Stray-Light Control
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Solution Overview
Problem
The challenge in the field of portable electronic devices is to improve the imaging quality of camera modules while maintaining miniaturization, as existing technologies struggle to balance these requirements effectively.
Innovation Solution
The proposed imaging lens assembly module includes a lens barrel with a symmetrical tip-end minimal aperture and a tubular portion with varying diameters, combined with optical elements and a transparent flat plate, to control light entry and reduce stray light, thereby enhancing imaging quality and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the camera module is miniaturized, then the device size is reduced, but the imaging quality deteriorates
Solution Approach 1:
The patent implements nesting by placing the aperture element inside the lens barrel structure, specifically positioning it between the first and second lens elements. This nested arrangement allows multiple optical components to occupy overlapping spatial volumes, reducing the overall camera module size while maintaining proper optical spacing and imaging quality
Solution Approach 2:
The patent optimizes the axial distance parameter Da along the optical axis dimension, specifically controlling the distance between the aperture element and the first assembling surface. By precisely adjusting this dimensional parameter, the patent achieves compact module size while maintaining optimal light control and imaging performance
2Object-generated harmful factors
If the aperture element is added to control light entry, then the stray light is reduced, but the device complexity increases
Solution Approach 1:
The aperture element serves multiple functions simultaneously: it controls the amount of light entering the lens system, blocks stray light from reaching the image sensor, and defines the entrance pupil position. This multi-functionality reduces the need for separate components, thereby controlling complexity while achieving effective stray light reduction
Solution Approach 2:
The aperture element acts as an intermediary component positioned between the lens elements and the image sensor, mediating the light path to prevent stray light from reaching the sensor while allowing controlled imaging light to pass through, thus effectively reducing harmful stray light
3Manufacturing precision
If the axial distance Da is increased, then the imaging quality is improved, but the module size increases
Solution Approach 1:
The patent optimizes the axial distance parameter Da to specific ranges (0.25mm to 1.0mm in various embodiments) to achieve the best balance between imaging quality and module compactness. By precisely controlling this dimensional parameter, the patent improves imaging performance without proportionally increasing the overall module length
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 configuration effectively reduces stray light and maintains a compact size, improving imaging quality and manufacturability, making it suitable for use in electronic devices with camera modules.
Implementation Method 1
The light blocking sheet includes an object-side surface, an image-side surface and an inner opening surface. The object-side surface is disposed on the first assembling surface. The inner opening surface is connected to the object-side surface and the image-side surface, and is corresponding to the tip-end minimal aperture.
Data Source
AI summary
An imaging lens assembly module has an optical axis, and includes a lens barrel and an optical element set. The lens barrel includes an object-side portion, a tubular portion and a tip-end minimal aperture. The object-side portion includes a first assembling surface. The tubular portion includes a plurality of second assembling surfaces. The optical element set includes at least one light blocking sheet and at least one optical lens element. The light blocking sheet includes an object-side surface, an image-side surface and an inner opening surface. The optical lens element includes an optical effective portion and a peripheral portion. The object-side portion of the lens barrel includes a first reversing inclined surface gradually enlarged from the tip-end minimal aperture to the image side of the lens barrel, and the first reversing inclined surface is not contacted with the optical element set.