Optical Path Changing Device Actuator Noise Reduction
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Solution Overview
Problem
Existing optical path changing devices for projection image display devices generate high noise levels due to the use of multiple actuators when changing the orientation of optical members.
Innovation Solution
The design incorporates a configuration with a first and second actuator, each positioned on one side of their respective swing center lines, which are shifted towards the optical member, and supported by elastic attachment members, allowing the optical member to swing about intersecting center lines, reducing noise by minimizing actuator displacement and utilizing elastic deformations to enhance swing angles and speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If four actuators are used to change the orientation of the optical member, then the orientation can be changed, but a high level of noise is generated from the actuators
Solution Approach 1:
The patent divides the optical member into multiple segments (first optical member and second optical member) that can be independently controlled by separate actuators. This segmentation allows for reduced noise by enabling simpler actuation mechanisms for each segment compared to moving the entire optical member with multiple actuators
Solution Approach 2:
Instead of moving the entire optical member to change projection position, the patent inverts the approach by keeping the optical member stationary and using auxiliary optical elements (such as reflective members or lens arrays) to redirect light paths. This inversion eliminates the need for high-power actuators and significantly reduces noise
2Ease of operation
If multiple actuators are used to drive the optical member, then the projection position can be shifted, but the device complexity increases
Solution Approach 1:
The patent employs optical elements that serve multiple functions: they can redirect light paths for position shifting, focus light, and in some configurations, provide both magnification and projection functions. This multi-functionality reduces the need for separate actuators and optical components, thereby reducing device complexity
Solution Approach 2:
The patent introduces intermediary optical elements (such as reflective members, beam splitters, or lens arrays) that mediate between the light source and the projection surface. These intermediaries enable position shifting and image manipulation without requiring direct mechanical movement of the entire optical system, thus simplifying the actuator configuration
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 effectively reduces noise levels during optical member orientation changes, enabling high-resolution image projection with reduced actuator noise and increased efficiency.
Implementation Method 1
the support member is coupled to the base member through a plurality of elastic members, each having a coupling portion that is elastically deformable
Data Source
AI summary
An optical path changing device includes: an optical member, a first support member that supports the optical member; a second support member that supports the first support member swingably about a first swing center line; a base member that supports the second support member swingably about a second swing center line; a first actuator that is disposed on one side with respect to the first swing center line and swings the first support member; and a second actuator that is disposed on one side with respect to the second swing center line and swings the second support member. The first swing center line is shifted toward the first actuator with respect to a shape center of the optical member at between the shape center of the optical member and the first actuator, or the second swing center line is shifted toward the second actuator with respect to the shape center of the optical member at between the shape center of the optical member and the second actuator.