Optical Member Driving Device Actuator Segmentation
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Solution Overview
Problem
Existing image moving devices require piezoelectric devices with significantly increased thickness to achieve ½ pixel movement, leading to difficulties in disposing them in narrow projector spaces, resulting in increased rotational moments and elongation amounts due to their distance from the center of the parallel flat plate glass.
Innovation Solution
An optical member driving device with a parallel flat plate shape, a driving mechanism that moves orthogonally to the optical member's surface, connecting members rotating on two orthogonal axes, support portions to pivot the connecting members, and a controller to manage the driving mechanism, which reduces rotational moments and elongation amounts by distributing forces effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If piezoelectric devices with increased thickness are used to achieve ½ pixel movement, then the image movement capability is improved, but the device complexity and space requirements increase significantly
Solution Approach 1:
The actuator system is segmented into multiple thin piezoelectric devices arranged in parallel, replacing a single thick piezoelectric device. This segmentation allows the system to achieve the required elongation through cumulative effect of multiple smaller units, reducing individual device thickness and easing spatial disposal while maintaining the total displacement capability for ½ pixel movement
Solution Approach 2:
Multiple piezoelectric devices are nested or stacked together in a compact arrangement, where each thin device contributes to the overall elongation. This nesting approach enables the system to achieve the required total displacement through coordinated action of multiple thin layers, effectively reducing the footprint and simplifying disposal within the projector's narrow space
2Length of moving object
If piezoelectric devices are disposed outside the display device outer shape to increase thickness, then the actuator thickness is improved, but the rotational moment increases significantly
Solution Approach 1:
Instead of increasing thickness in the vertical dimension by placing actuators outside the display device, the solution transitions to arranging multiple thin actuators in a planar distribution pattern. This dimensional shift from vertical stacking to lateral arrangement reduces the moment arm distance from the center, thereby decreasing the rotational moment while achieving the required total elongation through combined action of multiple actuators
3Length of moving object
If the parallel flat plate glass outer shape is made larger to accommodate thicker piezoelectric devices, then the actuator thickness is improved, but the rotational moment for driving the glass increases
Solution Approach 1:
The single thick actuator is segmented into multiple thin piezoelectric devices that are distributed across the support surface. This segmentation allows the system to achieve the required total elongation through the cumulative effect of multiple smaller actuators, eliminating the need to enlarge the glass plate while maintaining adequate spacing and reducing rotational moment
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
The solution allows for efficient movement of the parallel flat plate glass with reduced rotational moments and elongation amounts, enabling the placement of larger optical components near the actuators while maintaining effective drive capabilities.
Implementation Method 1
The piezoelectric devices operate as actuators for moving the parallel flat plate glass, and an elongation amount of each of the piezoelectric devices is proportional to a thickness of each of the piezoelectric devices
Data Source
AI summary
An optical member driving device of the present disclosure includes an optical member for changing an optical path, the optical member having a parallel flat plate shape; a driving mechanism having a movable portion controlled to move in a direction orthogonal to a surface of the optical member by a drive signal, the driving mechanisms being disposed outside the optical member; a connecting member rotatably connecting an end of the optical member and the movable portion of the driving mechanism on two axes orthogonal to each other at a surface center of the optical member; a support portion disposed between the end of the optical member and the movable portion of the driving mechanism, the support portion rotatably pivoting the connecting member; and a controller configured to control the movable portion of the driving mechanism.