Magnifying Element Back Projection Camera Module
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Solution Overview
Problem
Electronic devices with camera modules of constant focal length face challenges in capturing clear images of objects at close distances due to reduced image quality when magnified for display, as the height of the image obtained from the lens is small and difficult to enlarge effectively.
Innovation Solution
Incorporating a magnifying element with a camera module and a lens module, where the object side of the lens module is mounted for back projection, allowing for increased magnification power by reversing the light path between the lens and camera modules, enabling clear image capture even at object distances less than 10 mm with a magnification greater than 25.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a camera module with constant focal length is used, then the device can capture distant objects, but the image height is small and image quality deteriorates when magnified for display
Solution Approach 1:
The patent applies the inversion principle by reversing the traditional optical path. Instead of light traveling from object → lens → image sensor, the system uses a light source to illuminate the object, then captures the reflected light through the lens to the image sensor. This reversal enables effective magnification of close objects while maintaining image quality, solving the contradiction between small image height and poor quality when magnified.
Solution Approach 2:
The patent changes the optical parameters by introducing a variable focal length lens or adjusting the focal length to match the object distance. This parameter adjustment allows the system to optimize image height and quality for close-range objects, resolving the contradiction that exists with fixed focal length cameras designed for distant objects.
2Length of moving object
If the object distance is reduced to capture close objects, then the magnification increases, but the image becomes unclear and quality drops
Solution Approach 1:
The patent applies preliminary action by pre-positioning a light source to illuminate the close object before capture. This preliminary illumination ensures that sufficient light reaches the image sensor even at very close distances, maintaining image clarity and preventing the quality deterioration that normally occurs when capturing close objects with standard cameras.
Solution Approach 2:
The patent introduces a light source as an intermediary element between the close object and the image sensor. This intermediary provides the necessary illumination to enable clear image capture at close distances, mediating the relationship between the object and sensor to maintain image clarity despite the reduced object distance.
3Length of moving object
If a lens module is added for back projection to increase magnification, then the magnification power increases significantly, but the device complexity increases
Solution Approach 1:
The patent merges the lens module with the existing camera module into an integrated optical system. By combining these elements and using back projection through the same optical path, the system achieves high magnification (greater than 25x) while minimizing the increase in device complexity. The merged design allows shared components and streamlined structure.
Solution Approach 2:
The patent makes the lens module multi-functional by using it for both standard photography and magnified close-up imaging through back projection. This universal design allows the same optical components to serve multiple purposes, achieving high magnification capability without proportionally increasing device complexity, as the system can switch between different imaging modes using the same hardware.
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 allows for a significant magnification of the object image, with the image height on the image sensor being approximately 0.67 mm, resulting in a 33.5 times magnification on a display, effectively addressing the issue of small image height and poor image quality at close distances.
Implementation Method 1
The lens module includes a first lens and a second lens, where the first lens has a positive power and the second lens has a negative power. The object side of the lens module is mounted for back projection.
Data Source
AI summary
An electronic device includes a magnifying element. The magnifying element includes a camera module and a lens module. The camera module includes an image sensor and a lens related to the image sensor. The lens module is mounted on the lens and used as back projection to ensure that the light exit aperture of the lens module is opposite to the entrance aperture of the camera module. The power of magnification of the electronic device with a magnifying element is determined by the design features of the lens module.