Optical Member Actuation Using Rotating Arms for Compact Projection
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Solution Overview
Problem
Existing optical member driving devices increase in size, particularly in the light traveling direction, due to the movable portion of the actuator stroking in this direction.
Innovation Solution
An optical member driving device with actuators that include arms rotating about a perpendicular rotation center line, conductors with current flow, and magnet pairs generating intersecting magnetic fields to shift the optical member's peripheral edge, reducing the device's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the movable portion of the actuator strokes in the light traveling direction, then the actuator can effectively shift the optical member, but the size of the optical member driving device increases particularly in the light traveling direction
Solution Approach 1:
The actuator's arm rotates about a rotation center line that extends in a direction perpendicular to the light traveling direction, changing the dimension of rotation from the light path direction to a perpendicular direction. This dimensional change allows the actuator to shift the optical member effectively while minimizing the size increase in the light traveling direction.
Solution Approach 2:
The patent replaces a conventional linear stroking mechanism with a rotational mechanism driven by electromagnetic interaction between a conductor and magnet pairs. This substitution enables the actuator to achieve the required shifting function through rotation rather than linear motion, reducing the stroke length in the light traveling direction.
2Measurement precision
If multiple actuators are used to shift different portions of the optical member, then the orientation control precision improves, but the device complexity increases
Solution Approach 1:
The optical member is divided into multiple portions, with each actuator responsible for shifting a specific portion. This segmentation allows for precise control of the optical member's orientation by independently adjusting each actuator, achieving high precision without requiring an overly complex centralized control system.
Solution Approach 2:
Each actuator is designed with the same basic structure (arm, conductor, magnet pairs) that can be applied to multiple positions around the optical member. This universal design reduces the overall complexity by using standardized components rather than custom-designed actuators for each position.
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 device reduces the size of the optical member driving device and projection display apparatus by optimizing the orientation change mechanism, allowing for a more compact design.
Implementation Method 1
a magnet pair that is provided to sandwich the second end of the arm at an interval and generates a magnetic field in a direction intersecting with a direction where the conductor extends
Data Source
AI summary
An optical member driving device includes an optical member that light is incident on; and a plurality of actuators that shift different portions of an outer peripheral edge of the optical member in a traveling direction of the light immediately before the light is incidence. Each of the plurality of actuators includes an arm that rotates about a rotation center line extending in a direction perpendicular to the traveling direction and supports the optical member at a first end of the arm, a conductor that is provided at a second end of the arm and extends in a direction from the second end toward the first end, the conductor being where a current flows, and a magnet pair that is provided to sandwich the second end of the arm at an interval and generates a magnetic field in a direction intersecting with a direction where the conductor extends.