Back Focus Adjustment Mechanism with Separate Driving and Guiding Modules
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Solution Overview
Problem
Existing back focus adjustment mechanisms require high precision in parts and integrated driving and positioning, leading to complex assembly processes and reduced reliability.
Innovation Solution
A back focus adjustment mechanism with separate driving and positioning/guiding devices, where the driving device includes a motor, screw, nut, and reduction gear set, and the positioning/guiding device features a guiding shaft, reset mechanism, and limit bracket, allowing for independent movement and adjustment of the image sensor relative to the lens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If integrated driving and positioning is used in the back focus adjustment mechanism, then the structure is compact, but the precision requirements on parts increase and Z-axis coaxial precision decreases
Solution Approach 1:
The patent divides the integrated back focus adjustment mechanism into separate functional modules: a driving module (with motor and screw) and a positioning module (with guiding shaft and bearing). This segmentation allows each module to be optimized independently, reducing the precision requirements on individual parts while maintaining overall system accuracy.
2Device complexity
If integrated driving and positioning is used in the back focus adjustment mechanism, then the structure is compact, but the assembly process becomes complex
Solution Approach 1:
By segmenting the mechanism into modular components with distinct functions, the patent simplifies the assembly process. Each module can be assembled and tested independently before integration, reducing the complexity of the overall assembly process compared to a fully integrated design.
3Reliability
If separate driving and positioning devices are used, then the assembly process is simplified and reliability is enhanced, but the device complexity increases
Solution Approach 1:
The patent applies segmentation to create separate driving and positioning devices, which enhances reliability by isolating failure modes. The driving module handles motion generation while the positioning module ensures accuracy, and this functional separation prevents error propagation between systems.
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
Simplifies the assembly process, reduces part requirements, and enhances the reliability and precision of the back focus adjustment mechanism by separating the driving and positioning functions, resulting in improved stability and reliability under the same processing precision.
Implementation Method 1
an elastic reset member, which is sleeved on the mounting post; a stop assembly, which is detachably provided at an end of the mounting post away from the mounting plate, wherein two ends of the elastic reset member abut against the stop assembly and the mounting plate respectively
Data Source
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AI summary
Disclosed is a back focus adjustment mechanism and a camera provided with the same. The back focus adjustment mechanism comprises a driving device (10) and a positioning and guiding device (20) separately provided, wherein the positioning and guiding device (20) comprises a positioning assembly (21) and a guiding assembly (22), the guiding assembly (22) is mounted on the positioning assembly (21), and the driving device (10) is in driving connection with the guiding assembly (22) to drive the guiding assembly (22) to move. In the back focus adjustment mechanism and a camera provided with the same, after the driving device (10) and the positioning and guiding device (20) are separately provided, each structure of the back focus adjustment mechanism can be simpler, and the reliability of each structure of the back focus adjustment mechanism can be increased under the same processing precision.