Lens Drive Control Using Corrected Relative Position Function
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Solution Overview
Problem
Existing lens drive control methods are complex and inefficient, particularly when dealing with multiple lenses, as they either require individual lens control or limited applicability due to sensor positioning errors, leading to incorrect lens positioning and increased lens size.
Innovation Solution
A lens device with a main lens and subordinate lens, where the subordinate lens movement is controlled relative to the main lens position using a corrected function F(x) to account for sensor mounting errors, allowing for accurate interlocking and simplified control, reducing the need for extra movement stroke and parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual lens control is implemented, then positioning accuracy can be maintained, but control complexity increases significantly
Solution Approach 1:
The patent merges the control of multiple lenses into a unified control system. Instead of controlling each lens independently with separate origin detection sensors, the system uses a single origin detection sensor to detect the position of one lens (the reference lens), and then controls the positions of other lenses relative to this reference lens based on predetermined positional relationships. This combining approach maintains positioning accuracy while significantly reducing control complexity.
2Measurement precision
If sensor mounting errors are not corrected, then device complexity remains low, but lens positioning accuracy deteriorates
Solution Approach 1:
The patent implements preliminary action by pre-storing correction values for sensor mounting errors in a storage unit. During the origin detection process, the system automatically retrieves and applies the appropriate correction value based on which sensor is being used, without requiring real-time calculation or complex adjustment mechanisms. This preliminary preparation of correction data maintains positioning accuracy while keeping the correction process simple and automatic.
3Measurement precision
If extra movement stroke is added to compensate for sensor errors, then positioning accuracy improves, but lens size increases
Solution Approach 1:
The patent applies parameter changes by modifying the control parameters (correction values) rather than changing the physical dimensions of the lens system. Instead of adding extra movement stroke to compensate for sensor mounting errors, the system adjusts the positional parameters through software-based correction values that are stored and applied during origin detection. This approach maintains positioning accuracy without increasing the physical size or movement range of the lens components.
Data Source
AI summary
First and second focusing lenses G2 and G3 are moved to perform focusing. The second focusing lens G3 is moved to a position, which is derived by a function f(x), relative to the position x of the first focusing lens G2. The movement of the first and second focusing lenses G2 and G3 is controlled on the basis of origins that are individually set. The origin of the first focusing lens G2 is detected by a first photo interrupter 24, and the origin of the second focusing lens G3 is detected by a second photo interrupter 34. In a case where the first and second photo interrupters 24 and 34 have mounting errors, the function f(x) is corrected on the basis of the mounting errors and the movement of the second focusing lens G3 is controlled on the basis of the corrected function F(x).