Piezoelectric Optical Device Corner Electrode Inclination Control
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Solution Overview
Problem
Existing optical devices using piezoelectric elements struggle to effectively displace optical elements to change their inclination angle with respect to the optical axis, due to the weak forces generated by the expansion and contraction of piezoelectric elements, which limits their ability to eliminate speckle in laser-based displays.
Innovation Solution
A sheet-shaped piezoelectric element with a restricted movable area and independently voltage-controlled electrodes at adjacent corners, allowing the optical element to be displaced in multiple directions, including changing its inclination angle, by expanding and contracting in various manners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a piezoelectric element is used as a driving mechanism to displace an optical element, then the device structure is simplified and no motor is required, but the force generated is very weak and cannot effectively change the inclination angle of the optical element
Solution Approach 1:
The piezoelectric element is divided into multiple independent electrode regions that can be controlled separately. By applying voltage to specific electrode segments, localized expansion and contraction forces are generated, which are then combined to produce sufficient total force for inclining the optical element.
Solution Approach 2:
Different regions of the piezoelectric element are equipped with independent electrodes that can be activated selectively. This allows the generation of localized forces at specific corners or edges of the optical element, enabling precise control of inclination while accumulating sufficient force through coordinated regional activation.
2Adaptability or versatility
If electrodes are disposed at adjacent two corners in the movable area of the piezoelectric element, then the optical element can be displaced in multiple directions including changing inclination angle, but the electrode arrangement becomes more complex
Solution Approach 1:
Electrodes are strategically positioned at adjacent corners rather than symmetrically distributed, creating asymmetric force application points. This asymmetric arrangement enables the generation of rotational moments and inclination changes that symmetric arrangements cannot achieve, providing versatile displacement control.
Solution Approach 2:
By placing electrodes at corner positions rather than center positions, the control transitions from planar displacement to three-dimensional orientation control. The corner electrode arrangement creates lever arms that generate rotational effects, adding the dimension of angular control to the displacement capabilities.
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
This configuration enables the optical element to be displaced in a direction changing its inclination angle with respect to the optical axis, effectively reducing speckle and diffraction fringes, improving display quality compared to traditional methods.
Implementation Method 1
a piezoelectric element of a sheet shape... the piezoelectric element expands and contracts based on voltage applied to the electrodes
Data Source
AI summary
An optical device includes: a piezoelectric element of a sheet shape; a restriction section attached to the piezoelectric element, the restriction section configured to restrict a movable area in the piezoelectric element to a polygonal predetermined region; an optical element attached to the movable area of the piezoelectric element; and a plurality of electrodes disposed on the piezoelectric element, the plurality of electrodes configured to be applied with voltage independently, wherein: the electrodes are disposed at adjacent two comers in the movable area; and the piezoelectric element expands and contracts based on voltage applied to the electrodes in a manner that a periphery of the corner where the electrode is disposed in the movable area expands and contracts in multiple directions including two directions along two sides forming the corner.