Optical Scanning Device Asymmetric Frame Connection
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Solution Overview
Problem
Conventional optical scanning devices require multiple filters to remove natural frequency and harmonic components, leading to decreased linearity of the voltage applied to the drive source and a reduced area usable for image display, while also experiencing the ringing phenomenon.
Innovation Solution
The optical scanning device incorporates a mirror with a movable frame supported by drive beams and a fixed frame, where the movable frame connection parts are arranged opposite to the fixed frame connection parts with respect to the axis, reducing the number of natural vibration modes and allowing for the application of a voltage with high linearity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If multiple filters are used to remove natural frequency and harmonic components, then the ringing phenomenon is reduced, but the linearity of the applied voltage decreases and the area usable for image display becomes smaller
Solution Approach 1:
The patent extracts and removes specific connection parts (movable frame connection parts) from the drive beam structure to eliminate natural vibration modes. By strategically positioning these connection parts away from nodal points, the design removes the need for multiple filters while maintaining voltage linearity and image display area.
Solution Approach 2:
The patent introduces asymmetric positioning of movable frame connection parts relative to the drive beam structure. This asymmetric arrangement is designed to suppress specific natural vibration modes that cause ringing, allowing the system to maintain high voltage linearity without requiring multiple filtering components.
2Area of stationary object
If a voltage with sawtooth waveform is applied to extend the constant scanning speed section, then the image display area increases, but the ringing phenomenon occurs due to natural frequency components
Solution Approach 1:
The patent converts the harmful effect of natural vibration modes into a beneficial design constraint. By carefully positioning movable frame connection parts to avoid exciting these modes, the system can use aggressive sawtooth voltage waveforms to maximize image display area without suffering from ringing artifacts.
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 secures a larger area for image display and reduces the ringing phenomenon by enabling the use of fewer filters, maintaining high linearity of the voltage applied to the drive sources.
Implementation Method 1
a pair of drive beams (170A, 170B) that support the movable frame (160) from both sides; drive sources (171A, 171B) that are disposed on the drive beams (170A, 170B) and cause the movable frame (160) to be swung around a predetermined axis
Data Source
AI summary
An optical scanning device according to an embodiment of the present invention includes a mirror that has an optical reflection surface; a movable frame that supports the mirror; a pair of drive beams that support the movable frame from both sides; drive sources that are disposed on the drive beams and cause the movable frame to be swung around a predetermined axis that passes through the center of the optical reflection surface; and a fixed frame that supports the drive beams. A movable frame connection part, via which the movable frame and one of the drive beams are connected, is substantially arranged on a side opposite to a side on which a fixed frame connection part, via which the fixed frame and the one of the drive beams are connected, is arranged, with respect to the predetermined axis.