Camera Module With Reflective Lenses for Compact High-Magnification Imaging
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Solution Overview
Problem
Camera modules in small electronic devices face challenges in achieving high magnification while maintaining a small size, leading to issues such as flare due to insufficient optical path and optical defects.
Innovation Solution
A camera module design incorporating a lens assembly with a combination of transmissive and reflective lenses, including a first lens with a hole, a reflective second lens, and a reflective third lens, configured to satisfy specific optical parameters (4>f/TTL>0.5, 0.75>D1/CA>0.4, 0.75>D2/CA>0.4) to enhance optical path and minimize flare.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the camera module size is reduced, then the device becomes more compact, but the optical path length becomes insufficient causing flare and optical defects
Solution Approach 1:
The patent introduces a reflective lens that reflects light at an angle, changing the optical path from a straight line to a bent path. This dimensional change in the light path allows the optical path length to be extended without increasing the linear distance from the first lens to the image sensor, thereby maintaining a compact camera module size while preventing flare and optical defects.
Solution Approach 2:
The reflective lens acts as an intermediary element between the first lens and the image sensor. By introducing this intermediate reflective component, the light path is redirected through a longer route, effectively increasing the optical path length within the constrained physical space of the compact camera module, thus resolving the contradiction between small size and sufficient optical path.
2Length of moving object
If the total track length is shortened, then the camera module achieves high magnification with reduced size, but the optical path becomes insufficient resulting in flare
Solution Approach 1:
The reflective lens changes the optical path from a straight line to a bent path by reflecting light at an angle. This allows the optical path length to be extended in a non-linear manner while keeping the total track length (linear distance from first lens to image sensor) short, thereby achieving high magnification with reduced size without causing flare.
Solution Approach 2:
The optical path is segmented into multiple segments by introducing the reflective lens. Instead of a single straight path, the light travels through multiple segments (from first lens to reflective lens, then reflected to image sensor), which collectively form a longer optical path within the shortened total track length, preventing flare while maintaining compact dimensions.
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 achieves high magnification with reduced size and prevents optical defects like flare by optimizing lens arrangement and optical path length, ensuring improved image quality.
Implementation Method 1
a second lens adjacent to an image-side surface of the first lens, the second lens configured as a reflective type lens
Data Source
AI summary
A camera module includes a lens assembly including a plurality of lenses along a first optical path, and an image sensor including an image surface and provided at one side of the lens assembly, where the plurality of lenses include a first lens including a first hole through a center thereof, a second lens adjacent to an image-side surface of the first lens, the second lens configured as a reflective type lens, and including a second hole through a center thereof, a third lens adjacent to the first lens and configured as a reflective type lens, a fourth lens adjacent to an image-side surface of the third lens, and a fifth lens adjacent to an image-side surface of the fourth lens.