Optical Member Actuator Layout to Shrink Projection Depth
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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 shift different portions of the optical member's outer peripheral edge using arms rotating perpendicular to the light traveling direction, conductors with current flow, and magnet pairs generating intersecting magnetic fields to reduce size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
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 arm rotates about a rotation center line that extends in a direction perpendicular to the light traveling direction (width direction or height direction), rather than stroking parallel to the light traveling direction. This dimensional change in the rotation axis orientation allows the optical member to be shifted effectively while minimizing the device size 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 patent employs an asymmetric arrangement where actuators are positioned at different locations (e.g., both width direction and height direction sides) with different stroke directions relative to the optical member. This asymmetric configuration enables precise orientation control through coordinated operation of multiple actuators while maintaining a relatively simple overall 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 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
at least one 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.