Projector Lens Focus Compensation for Zoom Backlash
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional non-fixed focus lenses in projector devices suffer from idle travel and misjudgment of the zooming module, leading to blurry resolution and jitter defects during autofocus, necessitating additional compensation without extra hardware costs.
Innovation Solution
A focus compensation method that utilizes the zooming module to acquire transformation relations between zooming and focusing angles, calculates focused correction parameters, and adjusts the focusing module without synchronizing the modules to compensate for backlash, ensuring normal resolution and avoiding jitter defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the zooming module and focusing module are synchronized, then the structure is simple, but the focusing module produces blurry resolution during autofocus due to idle travel and misjudgment
Solution Approach 1:
The patent extracts the synchronization control function from the focusing module, making the zooming module independent of the focusing module's control. The zooming module operates separately without synchronizing with the focusing module, which eliminates the idle travel and misjudgment issues that cause blurry resolution during autofocus.
Solution Approach 2:
The patent applies preliminary action by pre-calculating and storing transformation relations between zooming angles and focusing angles before the autofocus process. This allows the focusing module to use pre-computed correction parameters directly during autofocus, avoiding real-time synchronization complexities and ensuring accurate focus resolution.
2Reliability
If additional compensation hardware is added, then the jitter defect can be reduced, but the hardware cost increases
Solution Approach 1:
The patent replaces mechanical synchronization mechanisms with a computational approach. Instead of using additional hardware to synchronize the modules mechanically, the system uses software-based transformation relations and correction parameters to achieve the same effect, thereby eliminating the need for extra compensation hardware while maintaining image stability.
Solution Approach 2:
The zooming module performs self-service by independently acquiring its own positioning information and using it to calculate correction parameters for the focusing module. This self-service approach eliminates the need for external synchronization hardware, as each module uses its own operational data to compensate for the other's movements.
3Stability of the object's composition
If the zooming module produces idle travel, then the assembly gaps are filled, but the position of the zooming module is misjudged causing jitter
Solution Approach 1:
The patent implements feedback by continuously monitoring the zooming module's actual position and using this information to calculate correction parameters. The transformation relation between zooming angle and focusing angle is dynamically adjusted based on real-time position feedback, ensuring that any idle travel or positioning errors are compensated for in the focusing module's operation.
Data Source
AI summary
A focus compensation method is applied to a non-fixed focus lens of a projector device. The non-fixed focus lens includes a zooming module and a focusing module. The focus compensation method includes utilizing the zooming module to acquire a zooming angle of the non-fixed focus lens, acquiring a transformation relation between the zooming angle and a focusing angle of the non-fixed focus lens, acquiring a focused correction parameter of the non-fixed focus lens relevant to the zooming angle in accordance with the transformation relation, and utilizing the focused correction parameter to amend the focusing module for backlash compensation of an auto focusing function of the non-fixed focus lens. The zooming module is not synchronized with the focusing module.