Movable device, image projection apparatus, head-up display, laser headlamp, head-mounted display, object recognition apparatus, and moving body
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Solution Overview
Problem
Existing movable devices, such as displacement control actuators, face reduced rigidity and stability due to large displacement requirements, leading to impaired operation stability.
Innovation Solution
A movable device design incorporating upper and lower drive beams, mechanically coupled by an adhesive, allows for large displacement amounts while maintaining structural rigidity and stability, using a meander structure to facilitate easy manufacturing and reduce size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the rigidity of the deformable part is reduced to obtain a large displacement amount, then the displacement amount increases, but the operation stability is lowered
Solution Approach 1:
The deformable part is divided into multiple drive beams (first drive beams and second drive beams) that are separated in the normal direction of the fixed frame. Each drive beam contributes to the overall displacement, allowing the system to achieve large displacement while each individual beam maintains sufficient rigidity for stable operation.
Solution Approach 2:
The drive beams are arranged in different dimensions (separated in the normal direction of the fixed frame), transforming a single-dimensional displacement problem into a multi-dimensional structure. This allows the cumulative displacement of multiple beams to achieve the required large displacement while each beam maintains its rigidity.
2Length of moving object
If multiple drive beams are used to achieve large displacement, then displacement amount increases, but device complexity increases
Solution Approach 1:
Multiple drive beams are merged into a single deformable part structure that is integrally formed. The first and second drive beams are combined such that they function together as one unit, simplifying the overall structure while maintaining the displacement benefits of multiple beams.
Solution Approach 2:
The deformable part serves multiple functions simultaneously: it provides the displacement mechanism through multiple drive beams, maintains structural rigidity, and reduces manufacturing complexity through integral formation. This multi-functionality resolves the contradiction between displacement amount and device complexity.
3Length of moving object
If direct bonding of piezoelectric substrates is used to obtain large displacement, then displacement amount increases, but manufacturing difficulty increases
Solution Approach 1:
The invention changes the manufacturing approach from direct bonding of piezoelectric substrates to forming drive beams as protrusions from a single deformable part. This parameter change in the manufacturing process simplifies production while maintaining the large displacement capability through the multi-beam structure.
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 design achieves increased displacement stability and ease of manufacturing, with reduced size and higher resonance frequencies, enabling efficient operation without applying high drive voltages.
Implementation Method 1
a displacement control actuator has been proposed that includes a piezoelectric element
Data Source
AI summary
A movable device includes a fixed frame, a movable portion, multiple drive beams to drive the movable portion. Each of the multiple drive beams has an end directly or indirectly coupled to the movable portion and another end coupled to the fixed frame. Each of the multiple drive beams includes: an upper drive beam and a lower drive beam separated from the upper drive beam in a normal direction of the fixed frame.