Reflective Driving Assembly for Compact Telephoto Camera Modules
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Solution Overview
Problem
Camera modules with telephoto imaging functions require longer focal lengths, leading to increased size, and existing reflective modules and driving assemblies do not optimize structure or imaging quality effectively.
Innovation Solution
A reflective module with a reflective element and a reflection driving assembly that includes a shaft support member and auxiliary balls, allowing the reflective element to rotate around a first axis, with grooves for the balls to reduce friction and enhance motion freedom, and rotating magnets and coils for precise rotation control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a longer focal length is used to achieve clear remote imaging, then the imaging quality at long distance is improved, but the camera module length increases
Solution Approach 1:
The patent employs a reflective module that folds the optical path by nesting the light reflection mechanism within the camera module structure. The light path is folded back on itself using reflective elements, allowing the optical system to achieve a longer effective focal length while maintaining a compact physical footprint, thus resolving the contradiction between imaging quality and module length
Solution Approach 2:
The patent introduces a reflective driving assembly that enables the reflective element to rotate around a first axis, adding rotational degree of freedom to control the light path direction. This dimensional change allows dynamic adjustment of the folded optical path, enabling clear remote imaging while maintaining compact module dimensions
2Measurement precision
If the reflective element rotation speed and accuracy are increased to improve imaging quality, then the imaging quality is improved, but the device complexity increases
Solution Approach 1:
The patent replaces complex mechanical rotation control systems with an electromagnetic driving mechanism. The reflective driving assembly uses electromagnetic forces to control the rotation of the reflective element, achieving precise and rapid angular adjustments without the need for complex mechanical gears, linkages, or manual adjustment mechanisms, thus improving imaging quality while limiting complexity increase
Solution Approach 2:
The reflective driving assembly serves multiple functions: it controls the rotation of the reflective element, adjusts the light path direction, and enables both rapid response and precise positioning. This multi-functionality allows the system to achieve high imaging quality through a single integrated mechanism rather than multiple separate components, thereby limiting the increase in device complexity
3Ease of operation
If auxiliary balls with straight-line grooves are used to reduce friction and enhance motion freedom, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The patent employs auxiliary balls that can dynamically adjust their position within straight-line grooves during the rotation of the reflective element. This dynamic configuration allows the balls to maintain optimal contact points that reduce friction while accommodating the rotational motion, enhancing motion freedom without requiring complex active control mechanisms
Solution Approach 2:
The auxiliary balls with straight-line grooves provide self-lubrication and self-adjustment through their geometric configuration. The straight-line grooves guide the balls along optimal paths that minimize friction during rotation, and the balls automatically adjust their positions based on the rotational state, reducing the need for external lubrication or control systems, thus improving ease of operation while limiting complexity increase
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
Improves the imaging quality by enhancing the rotation speed and accuracy of the reflective element, reducing electromagnetic interference, and optimizing the structure for a compact design.
Implementation Method 1
the at least two auxiliary balls are provided between at least two auxiliary upper grooves of the frame and at least two auxiliary lower grooves of the reflection base, and one of the at least two auxiliary upper grooves and the at least two auxiliary lower grooves are straight-line grooves extending along the tangent direction of a virtual circle centered on the first axis
Implementation Method 2
a reflective element, which reflects the light rays propagating in the direction of a first axis to the direction of a second axis intersecting with the first axis at a certain angle
Implementation Method 3
rotating magnets and coils for precise rotation control
Data Source
AI summary
This application discloses a reflective module and a camera module. Particularly, the reflective module comprises: a reflective element and a reflection driving assembly; wherein the reflective element reflects the light rays propagating in a direction of a first axis to a direction of a second axis intersecting with the first axis at a certain angle, and the reflection driving assembly comprises a reflection base, a frame supporting the reflective element and capable of rotating around the first axis, and a shaft support member and at least two auxiliary balls which are provided between the reflection base and the frame. Particularly, the shaft support member is passed through by the first axis and fixed to the reflection base or frame; and the at least two auxiliary balls are provided between at least two auxiliary upper grooves of the frame and at least two auxiliary lower grooves of the reflection base, wherein one of the at least two auxiliary upper grooves and at least two auxiliary lower grooves are straight-line grooves extending along a tangent direction of a virtual circle centered on the first axis.