Camera Module Optical Path Adjustment for Back Focal Length
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Solution Overview
Problem
The size limitations of portable terminals restrict the camera module's ability to maintain a sufficient back focal length, hindering focus adjustment and long-distance imaging capabilities.
Innovation Solution
A camera module design incorporating an optical path adjustment member with folding portions and driving assemblies that allow for movement along the optical axis, enabling adjustment of the distance between the rearmost lens and the imaging plane, thereby securing a sufficient back focal length for both short and long-distance image capturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the camera module size is reduced to fit portable terminal thickness limitations, then the camera module can be integrated into portable terminals, but the back focal length from the back lens to the imaging plane becomes insufficient, preventing focus adjustment and long-distance imaging
Solution Approach 1:
The patent introduces a prism that redirects the optical path in a direction intersecting the optical axis, effectively utilizing a third dimension (lateral direction) to extend the back focal length. This allows the light to travel a longer path from the back lens to the imaging plane without increasing the camera module's thickness, thereby resolving the contradiction between compact size and sufficient back focal length for focus adjustment and long-distance imaging
2Length of moving object
If the back focal length is increased to enable focus adjustment and long-distance imaging, then the camera module can perform focus adjustment and long-distance imaging, but the camera module size exceeds the thickness of portable terminals
Solution Approach 1:
By incorporating a prism that deflects light at an angle intersecting the optical axis, the patent extends the optical path length in a lateral dimension rather than extending it along the optical axis direction. This dimensional change allows the back focal length to be increased for focus adjustment and long-distance imaging while keeping the camera module's thickness within portable terminal limits
3Device complexity
If conventional optical paths are used without folding members, then the optical path is simple, but the distance from the back lens to the imaging plane is insufficient for focus adjustment
Solution Approach 1:
The patent introduces a prism that redirects the optical path in a direction intersecting the optical axis, effectively utilizing a third dimension (lateral direction) to extend the back focal length. This allows the light to travel a longer path from the back lens to the imaging plane without increasing the camera module's thickness, thereby resolving the contradiction between compact size and sufficient back focal length for focus adjustment and long-distance imaging
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 design allows for rapid focus adjustment and secure back focal length, even in compact portable terminals, enhancing the camera's ability to capture images at various distances with reduced driving current requirements.
Implementation Method 1
The first optical path folding portion may be configured to reflect or refract light incident from the lens module to the second optical path folding portion
Implementation Method 2
The first optical path folding portion may be configured to reflect or refract light incident from the lens module to the second optical path folding portion
Implementation Method 3
a first driving assembly configured to move the optical path adjustment member in a direction parallel to the optical axis
Data Source
AI summary
A camera module includes: a lens module comprising one or more lenses; and an optical path adjustment member disposed to face the lens module or an imaging plane, and configured to be driven in a direction of an optical axis of the lens module to vary a distance from a rearmost lens of the lens module to the imaging plane.