Periscope Optical Lens Layout for Thin Phones and Low-Light Imaging
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Solution Overview
Problem
The miniaturization of optical lenses in smart electronic devices, such as mobile phones, compromises image quality, especially in low-light conditions due to limited lens caliber and light transmission, which is exacerbated by the use of periscope lenses.
Innovation Solution
An optical lens design comprising a first lens with a concave object-side surface and convex image-side surface, a reflector to redirect light, and subsequent lenses with specific refractive powers and surface configurations, including aspherical surfaces, to optimize light intake and path direction while reducing installation space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the lens volume is compressed to achieve miniaturization and ultra-thinness, then the device thickness is reduced, but the image quality deteriorates
Solution Approach 1:
The patent employs a periscope optical path design where light travels laterally through the lens assembly rather than directly along the optical axis. This dimensional change allows the optical path length to be extended without increasing the thickness along the optical axis, thereby maintaining image quality while achieving ultra-thinness in the device direction.
2Length of moving object
If the caliber of the periscope camera is limited by device thickness, then the device remains thin, but the light transmission amount decreases
Solution Approach 1:
By changing the light path from axial to lateral traversal, the patent enables the lens caliber to be larger without increasing device thickness. The light enters from the side and exits through the image sensor plane, effectively decoupling the caliber size from the thickness constraint.
Solution Approach 2:
The patent employs an adjustable aperture diaphragm that can dynamically control the light transmission amount. This allows optimization of light intake for different shooting conditions while maintaining the compact periscope structure, effectively managing the trade-off between caliber limitation and light transmission.
3Manufacturing precision
If a periscope lens is used to prevent lens volume compression, then the image quality is maintained, but the device thickness increases
Solution Approach 1:
The periscope design redirects the optical path at 90 degrees using reflective surfaces, allowing the light to traverse a longer path laterally rather than axially. This maintains the necessary optical path length for image quality while keeping the thickness along the optical axis minimal.
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
Enhances light intake and focal length, improving image quality and enabling high-definition imaging in low-light conditions without increasing device thickness.
Implementation Method 1
The reflector is configured to reflect incident light transmitted by the first lens, to enable reflected incident light to be transmitted to the second lens
Implementation Method 2
The first lens has positive refractive power, The second lens has positive refractive power, The third lens has negative refractive power, The fourth lens has refractive power, The fifth lens has refractive power
Data Source
AI summary
An optical lens, an optical module, and an electronic device are provided. The optical lens includes: a first lens (1), a reflector (2), a diaphragm (3), a second lens (4), a third lens (5), a fourth lens (6), and a fifth lens (7) in sequence from an object side to an image side.