Metal Optical Unit Matte Surface for Stray Light Suppression
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Solution Overview
Problem
The use of a metal plate as a substrate in optical devices can lead to stray light reflection, deteriorating optical characteristics.
Innovation Solution
An optical unit with a base made of metal, featuring a support portion, extending portions, and a vibrating element that induces twisting vibration, accompanied by a matte surface on specific regions to suppress stray light and enhance bonding, thereby improving optical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal plate is used as a substrate in an optical device, then structural strength and stability are improved, but stray light is generated due to reflection from the substrate surface, deteriorating optical characteristics
Solution Approach 1:
The patent applies different surface treatments to different regions of the metal substrate. The regions that would otherwise cause stray light reflection are treated with matte finishing, while other regions maintain their original properties. This local differentiation allows the substrate to simultaneously provide structural strength and suppress stray light generation.
Solution Approach 2:
The patent converts the harmful reflective property of the metal substrate into a beneficial matte surface treatment. By applying matte finishing to specific regions, the harmful reflections are transformed into diffuse scattering, effectively suppressing stray light while maintaining the overall structural integrity of the metal substrate.
2Object-generated harmful factors
If a matte surface is formed on the base, then stray light generation is suppressed and optical characteristics are improved, but bonding strength of the vibrating element may be reduced
Solution Approach 1:
The patent applies matte surface treatment selectively to specific regions of the base where stray light suppression is needed, while leaving other regions with finishes that promote bonding. This spatial differentiation of surface properties allows simultaneous achievement of stray light suppression and strong bonding for the vibrating element.
Solution Approach 2:
The base surface is segmented into different functional zones: some regions are treated with matte finishing for stray light suppression, while other regions maintain properties suitable for bonding. This segmentation of the surface into zones with different characteristics resolves the contradiction between optical performance and bonding strength.
3Reliability
If the vibrating element is firmly bonded to the base, then vibration transmission is improved, but stray light reflection from the bonding area increases
Solution Approach 1:
The patent differentiates the surface properties at the bonding interface from other regions. The bonding area maintains properties that ensure strong adhesion and vibration transmission, while other regions receive matte treatment to suppress stray light. This local quality differentiation resolves the contradiction between reliable vibration transmission and stray light suppression.
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 matte surface formation on the optical unit suppresses stray light and strengthens bonding, leading to improved optical characteristics and manufacturing efficiency.
Implementation Method 1
The piezoelectric element is connected to a variable frequency drive circuit. In this mirror vibrating portion, the piezoelectric element expands and contracts due to application of a voltage to the piezoelectric element, so that a plate wave is generated on the substrate
Implementation Method 2
a matte surface is formed on at least a part of at least one of a first region on a side of the movable portion of a position where the vibrating element is provided in the support portion on the main surface
Data Source
AI summary
A base, which has a main surface and a back surface on an opposite side from the main surface and is made of metal, an optical surface provided on the main surface, and a vibrating element provided on the main surface or the back surface are included, in which the base has a support portion, a first extending portion and a second extending portion extending from the support portion, a movable portion disposed between the first extending portion and the second extending portion, and a first connecting portion connecting the first extending portion and the movable portion to each other, and a second connecting portion connecting the second extending portion and the movable portion to each other.