Optical Element Posture Adjustment via Intermediary Pressing
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Solution Overview
Problem
Existing scanning optical devices face challenges in finely adjusting the posture of mirrors due to high sensitivity, which is attributed to the short dimension from the shaft to the adjustment screw, leading to difficulties in precise alignment.
Innovation Solution
The optical device incorporates an optical element with a first and second surface, supported by a first seat surface member and a first pressing member, along with an adjustment member and a second pressing member, to adjust the posture of the optical element while maintaining low sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the adjustment screw is disposed close to the shaft to reduce the dimension between them, then the structure becomes more compact, but the adjustment sensitivity becomes excessively large making fine adjustment difficult
Solution Approach 1:
A pressing member (spring) is introduced as an intermediary element between the adjustment screw and the optical element. This pressing member applies a pressing force to the optical element at a position different from where the adjustment screw contacts it, thereby decoupling the structural distance from the functional leverage arm. The pressing member mediates the force transmission, allowing the adjustment screw to be positioned close to the shaft for compactness while maintaining a larger effective distance for fine adjustment sensitivity.
2Measurement precision
If the adjustment screw contacts the optical element at a position far from the shaft, then adjustment sensitivity is reduced for finer control, but the dimension from the shaft increases making the structure larger
Solution Approach 1:
The pressing member serves as a mediator that separates the contact position of the adjustment screw from the position where the effective leverage is applied. The adjustment screw contacts the optical element at one position, while the pressing member applies force at another position, allowing the system to achieve fine adjustment sensitivity without requiring a large physical dimension from the shaft.
Solution Approach 2:
The invention transitions from a one-dimensional arrangement where the adjustment screw is positioned at a specific distance from the shaft, to a two-dimensional arrangement where the pressing member applies force at a different position. This allows the adjustment screw to be close to the shaft in one dimension while the pressing force is applied at a position that provides the desired leverage in another dimension.
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 allows for precise adjustment of the optical element's posture with reduced sensitivity, enabling finer control and improved performance in image forming devices.
Implementation Method 1
a compression coil spring that abuts on the back surface of the mirror and is capable of adjusting a posture (angle) of the mirror by rotating the adjustment screw
Data Source
AI summary
An optical device includes: an optical element having a first surface and a second surface; a first seat surface member that abuts on the first surface of the optical element; a first pressing member that abuts on the second surface of the optical element at a position facing the first seat surface member via the optical element, and press the optical element against the first seat surface member; an adjustment member that abuts on the second surface of the optical element at a position different from the first pressing member, and displaces the abutment position to adjust a posture of the optical element; and a second pressing member that abuts on the first surface of the optical element at a position facing the adjustment member via the optical element, and applies a pressing force to the abutment position to press the optical element against the adjustment member.