Optical Folding Lens Structure for Compact Long-Focus Camera Modules
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Solution Overview
Problem
The challenge of integrating long-focus optical lenses into miniaturized electronic devices, such as smartphones and tablets, is exacerbated by the increase in module size due to longer focal lengths, making it difficult to mount camera modules effectively.
Innovation Solution
An optical lens design incorporating an optical folding element with a structurally bent configuration that allows for at least six reflections, reducing the height and length of the lens while maintaining long-focus capabilities through compact arrangement with an image sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the focal length of the optical lens is increased to improve long-focus photographing capability, then the imaging performance is improved, but the module size of the camera module increases, making it difficult to mount in miniaturized electronic devices
Solution Approach 1:
The patent introduces an optical folding element that folds the optical path in a direction perpendicular to the optical axis, transforming the linear extension of the optical path into a compact folded structure. This allows the optical path length to be extended in one dimension while keeping the module size compact in other dimensions, effectively resolving the contradiction between long focal length and small module size
Solution Approach 2:
The optical folding element is integrated within the camera module structure, with the folded optical path nested within the compact module housing. The optical folding element itself contains multiple reflective surfaces nested within its structure, allowing the long optical path to be nested within a small physical volume
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 miniaturization of the optical lens and camera module by reducing physical size without compromising imaging quality or long-focus performance, ensuring mechanism reliability and avoiding interference.
Implementation Method 1
The optical folding element includes an incident surface, a deflection reflection surface, and an emergent surface. After passing through the lens group, external light is emitted into the optical folding element through the incident surface, and after being subject to at least six reflections in the optical folding element, the external light is emitted out of the optical folding element through the emergent surface
Data Source
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AI summary
Embodiments of this application provide an optical lens, a camera module, and an electronic device. The optical lens includes a lens group and an optical folding element located on an image side of the lens group. The lens group includes at least one lens having a positive focal power. The optical folding element includes a first part, a second part, and a third part that are sequentially connected from an object side to the image side. The first part extends in a first direction, the third part extends in a second direction intersecting with the first direction, and a plane in which the first direction and the second direction are located is perpendicular to an optical axis of the lens group. In the optical folding element, an incident surface is located in the first part, a deflection reflection surface is located in the second part and is parallel to the optical axis of the lens group, and an emergent surface is located in the third part. Light is emitted into the optical folding element through the incident surface, and after being subject to at least six reflections in the optical folding element, the light is emitted out of the optical folding element through the emergent surface, where the at least six reflections include one reflection occurring on the deflection reflection surface.