Folded Camera Module Layout for Compact Telephoto Stabilization
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Solution Overview
Problem
Existing camera modules with reflective members on the subject side are difficult to miniaturize due to increased size and power consumption of the driving mechanism, making it challenging to integrate into miniaturized electronic devices while maintaining telephoto performance.
Innovation Solution
A camera module design that places a reflective member between the lens array and the image sensor, allowing for reduced size and increased back focal length, enabling focus adjustment and image stabilization functions while minimizing the module's size and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lens elements is increased to correct chromatic aberration and improve image quality, then manufacturing cost and device complexity increase
Solution Approach 1:
The patent uses composite lens structures combining resin and glass materials. Specifically, the first lens element has a positive refractive index made of resin, while the second lens element has a negative refractive index made of glass. This composite material approach corrects chromatic aberration and improves image quality without requiring an excessive number of lens elements, thereby controlling device complexity and manufacturing cost.
2Use of energy by moving object
If the aperture is enlarged to increase light intake and improve low-light performance, then spherical aberration and manufacturing difficulty increase
Solution Approach 1:
The patent employs a variable aperture mechanism that can dynamically adjust the aperture size. The aperture is configured to be variable rather than fixed, allowing it to adapt to different lighting conditions. This dynamic approach enables large aperture opening for improved light intake while managing spherical aberration through controlled aperture adjustment, and simplifies manufacturing compared to creating a permanently large aperture structure.
3Use of energy by moving object
If the F-number is reduced to improve low-light performance, then depth of field decreases and image sharpness is compromised
Solution Approach 1:
The patent achieves improved low-light performance while maintaining image sharpness through optimized lens parameter design. The focal length is set within a specific range (23mm to 35mm), and the lens elements have carefully controlled refractive indices and curvatures. These parameter optimizations allow for effective low-light performance without excessively reducing the F-number, thereby maintaining adequate depth of field and image sharpness.
4Manufacturing precision
If the lens barrel is extended to accommodate more lens elements for aberration correction, then the overall module size increases
Solution Approach 1:
The patent implements a compact lens barrel design where lens elements are efficiently arranged in a nested configuration. The first and second lens elements are positioned close together with optimized spacing, and the variable aperture is integrated within the lens barrel structure. This nesting approach allows sufficient space for aberration correction while minimizing the overall lens barrel length and keeping the camera module compact.
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 design facilitates easy miniaturization of the camera module, enhances telephoto performance, and supports focus adjustment and image stabilization functions, suitable for integration into compact electronic devices.
Implementation Method 1
the first lens element has a positive refractive index, and the second lens element has a negative refractive index, thereby reducing chromatic aberration and improving image quality
Implementation Method 2
the aperture is configured to be variable, which may help reduce spherical aberration and improve manufacturing feasibility
Data Source
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AI summary
According to various embodiments of the disclosure, a camera module and/or an electronic device including the same may include a camera housing, a barrel structure including at least one lens aligned along a first optical axis direction, the barrel structure being at least partially accommodated in the camera housing, a guide unit at least partially accommodated in the camera housing and configured to guide the barrel structure to reciprocate along the first optical axis direction or reciprocate in a plane intersecting the first optical axis, a driving unit including at least one coil and at least one magnet disposed to at least partially face the at least one coil in a direction intersecting the first optical axis, a reflective member at least partially accommodated in the camera housing and configured to refract or reflect light incident through the at least one lens in a second optical axis direction intersecting the first optical axis, and an image sensor disposed on the camera housing, aligned with the reflective member in the second optical axis direction, and configured to receive the light refracted or reflected by the reflective member. The at least one coil or the at least one magnet may be disposed at a position at least partially facing the reflective member in a direction intersecting the first optical axis. Various other embodiments are possible.