Differential Transmitter for Dual-Mode Optical Element Positioning
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Solution Overview
Problem
Conventional digital photographing devices require complex mechanical structures and separate switches to implement both auto focusing (AF) and manual focusing (MF) functions, making it inconvenient for users to adjust the lens position freely and causing difficulties in fine-tuning the focus.
Innovation Solution
A device with a simple and compact design that includes a differential transmitter with first and second transmitting rings and an intermediate ring, allowing for both automatic and manual adjustment of the optical element's position without a separate switch, using a driving element for automatic focusing and a manual manipulation ring for user-controlled adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate switch is provided to select between AF mode and MF mode, then both AF and MF functions can be implemented, but user convenience deteriorates due to the inconvenience of manipulating the switch
Solution Approach 1:
The patent combines the AF and MF functions into a unified system where the MF ring serves dual purposes: it can be rotated freely for manual focusing, or pressed to engage with the drive gear for automatic focusing. This eliminates the need for a separate mode-switching mechanism, allowing users to switch between AF and MF simply by pressing or releasing the MF ring, thereby improving operational convenience while maintaining both focusing modes.
2Adaptability or versatility
If mechanical elements with complicated structure are employed to connect or block driving force, then both AF and MF functions can be realized, but device complexity increases
Solution Approach 1:
The MF ring is designed as a multi-functional component that serves both as the manual focusing interface and as the engagement mechanism for automatic focusing. By integrating the mode-switching function into the existing MF ring structure, the patent eliminates the need for separate switches and complex mechanical linkages, thereby reducing overall device complexity while maintaining both AF and MF capabilities.
Solution Approach 2:
The patent extracts the mode-switching function from a separate mechanical switch and integrates it directly into the MF ring structure. This simplification removes unnecessary mechanical elements and reduces the complexity of the focusing system while preserving both automatic and manual focusing functions.
3Measurement precision
If the MF ring rotates over a wide angular range during AF function, then fine tuning capability is improved, but ease of holding the camera deteriorates
Solution Approach 1:
The patent implements a dynamic engagement mechanism where the MF ring can transition between a locked state (engaged with the drive gear for AF) and an unlocked state (free rotation for MF). During AF operation, the ring remains locked to prevent unwanted rotation and maintain camera stability. When manual intervention is needed, the user presses the ring to disengage it, allowing controlled rotation for fine-tuning focus without compromising overall camera stability.
Data Source
AI summary
There is provided a device for transferring an optical element including: a differential transmitter including an intermediate ring rotatably with respect to a housing and having a plurality of openings on its circumference, first decelerating members rotatably inserted into ones of the openings, a first transmitting ring disposed on one side of the intermediate ring to contact the first decelerating members, and a second transmitting ring disposed on an opposite side of the intermediate ring; a driving element generating a driving force to rotate the first transmitting ring; a manual manipulation ring transmitting a rotation force generated due to manual manipulation to the second transmitting ring; a moving portion that supports the optical element and moving along the direction of an optical axis; and a cam rotating due to connection with the intermediate ring and having a cam groove connected with the moving portion.