Camera Lens with Reflective Element for Vignetting Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wide-angle camera lenses with view angles greater than 180 degrees suffer from optical center separation, vignetting, and low signal-to-noise ratio due to ghost formation, which degrades image quality and illuminance uniformity, especially in panoramic shooting.
Innovation Solution
A camera lens design incorporating a front negative refractive index lens group, a rear positive refractive index lens group, a reflective element, and an aperture, which separates the positive and negative refractive index lens groups to correct aberrations and eliminate ghosting, ensuring uniform illuminance and improved signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two wide-angle camera lenses with view angle greater than 180 degrees are used for panoramic shooting, then full-space image information can be obtained, but optical center separation occurs causing image deterioration in overlapping regions
Solution Approach 1:
The patent divides the panoramic imaging system into two separate camera lenses with view angles greater than 180 degrees, each capturing different spatial regions. By segmenting the full-space imaging task into two manageable optical systems, the patent achieves comprehensive coverage while allowing independent optimization of each lens to minimize optical center separation effects in overlapping regions.
2Area of stationary object
If the distance between two wide-angle camera lenses along the optical axis is increased, then more full-space coverage is achieved, but image deterioration in overlapping regions worsens
Solution Approach 1:
The patent optimizes the optical parameters of each camera lens, specifically designing view angles greater than 180 degrees and controlling focal lengths and aperture settings. By changing these optical parameters, the system achieves extensive full-space coverage while maintaining acceptable image quality in overlapping regions through precise parameter control.
3Adaptability or versatility
If wide-angle camera lens structures with view angle exceeding 180 degrees are used, then panoramic imaging capability is improved, but vignetting occurs at large field of view
Solution Approach 1:
The patent applies local quality optimization by designing lens elements with varying refractive indices and curvatures at different positions within the optical path. This allows the optical system to maintain uniform illuminance across the large field of view by compensating for light intensity variations locally, preventing vignetting while preserving panoramic imaging capability.
4Ease of manufacture
If conventional wide-angle camera lens structures are used without considering ghost formation, then manufacturing is simpler, but signal-to-noise ratio is low due to ghost and stray light
Solution Approach 1:
The patent introduces intermediary optical elements such as aperture stops and reflective components positioned strategically within the lens system. These intermediaries block stray light paths that would otherwise create ghost images, thereby improving the signal-to-noise ratio without significantly complicating the manufacturing process.
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 prevents vignetting and enhances signal-to-noise ratio by reducing image deterioration and stray light, allowing for high-quality panoramic imaging with reduced lens group size and improved light absorption.
Implementation Method 1
a reflective element; and an aperture, wherein the front lens group includes a first lens and a second lens, the rear lens group includes a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens
Data Source
AI summary
The disclosure discloses a camera lens and an imaging device, and the camera lens includes: a front lens group close to the object-side, a reflective element, a diaphragm and a rear lens group close to the image-side, wherein the front lens group comprises a first lens and a second lens; the rear lens group includes a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens; the front lens group is a negative refractive index lens group, the rear lens group is a positive refractive index lens group; the reflective element is disposed between the second lens and the third lens; the diaphragm is disposed between the third lens and the fourth lens. The camera lens and the imaging device of the present disclosure may not generate vignetting at the large field of view.