Oscillating Optical Device Fixing Portion Design
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Solution Overview
Problem
Existing image display apparatuses, such as projectors and head-mounted displays, face challenges in minimizing device size while maintaining high resolution and reducing stress-induced vibrations, particularly in oscillation driving devices that use belt-like plate springs, which occupy significant space and require longer twisting beams to achieve necessary oscillation frequencies.
Innovation Solution
An optical device with a movable portion supported by a shaft and a fixing portion, where the fixing portion has a thicker end acting as a free end, allowing for oscillation with reduced stress and increased displacement, and incorporating a permanent magnet and coil for magnetic interaction to generate driving force, and using resin materials for the movable, shaft, and fixing portions to enhance flexibility and vibration attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a belt-like plate spring is used to oscillate the flap, then the oscillation function is achieved, but the occupation area of the device increases
Solution Approach 1:
The patent combines the support function and oscillation beam function into a single fixing portion. The fixing portion has a first end connected to the shaft portion and a second end that serves as a free end, allowing it to function both as a structural support and as the oscillation beam, thereby eliminating the need for a separate belt-like plate spring and reducing the device's occupation area.
Solution Approach 2:
The fixing portion is designed to perform multiple functions: it supports the shaft portion, acts as an oscillation beam, and provides structural anchoring. This multi-functional design replaces the single-function belt-like plate spring, achieving space savings while maintaining oscillation reliability.
2Stress or pressure
If the twisting beam portion length is increased to decrease stress, then the generated stress is reduced, but the occupation area increases
Solution Approach 1:
The patent applies different thicknesses to different portions of the fixing portion. The intermediate portion has a greater thickness than the first end portion, creating local structural reinforcement where it is most needed for stress resistance, while keeping other areas compact. This localized quality variation reduces overall stress without requiring a longer beam.
Solution Approach 2:
The patent changes the thickness parameter of the fixing portion at different locations. By increasing the thickness at the intermediate portion, the structural strength and stress resistance are enhanced locally, allowing the beam to be shorter while still maintaining low stress levels during oscillation.
3Stress or pressure
If the fixing portion thickness is increased at the intermediate portion, then the stress resistance is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent varies the thickness parameter along the length of the fixing portion, with the intermediate portion having greater thickness than the end portions. This parameter change optimizes stress resistance at critical locations while maintaining a relatively simple monolithic structure that can be manufactured as a single piece, balancing structural requirements with manufacturing ease.
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 optical device achieves a miniature form with reduced stress and increased oscillation angle, enabling high-quality image display with minimal unintended light deflection, thus allowing for high-resolution image projection without increasing pixel count.
Implementation Method 1
a permanent magnet that is provided in the movable portion; and a coil that generates a magnetic field to be operated to the permanent magnet
Data Source
AI summary
An optical device includes: an optical portion that has a light incident surface on which light is incident; a movable portion that supports the optical portion; a shaft portion that supports the movable portion so that the movable portion is oscillatable; and a fixing portion that is connected to the shaft portion, wherein the fixing portion has a thickness greater than the shaft portion and includes a portion of which an end not connected to the shaft portion serves as a free end.