Light Transmissive Body Vibration for Clear Field of View
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Solution Overview
Problem
Existing vibration devices for light transmissive bodies, such as those used in imaging units, face challenges in removing foreign matter like raindrops while maintaining the field of view, as the central portion of the light transmissive body is often obstructed by liquid droplets that gather due to vibration, leading to a compromised image quality.
Innovation Solution
A vibration device configuration featuring a light transmissive body supported by a cylindrical body, a spring portion, and a vibrating body, where a protruding portion is designed to extend outward from the main body, with a mass ratio between the protruding and main body portions optimized between 0.8 and 1.2, ensuring the resonant frequency of the light transmissive body is higher than that of the spring portion, allowing for increased displacement of the peripheral portion and effective removal of foreign matter without obstructing the field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the light transmissive body is vibrated to remove foreign matter, then foreign matter removal effectiveness is improved, but liquid droplets gather in the central portion obstructing the field of view
Solution Approach 1:
The invention introduces an asymmetric mass distribution by adding a protruding portion to the light transmissive body. This creates an asymmetric moment of inertia that causes the peripheral portion to have larger displacement than the central portion during vibration, preventing liquid droplets from gathering in the central field of view area while still achieving effective foreign matter removal.
Solution Approach 2:
The invention modifies the vibration pattern by changing the mass distribution in the radial dimension (adding protruding portion), which transforms the vibration displacement pattern from primarily central to primarily peripheral. This dimensional modification of mass distribution achieves the desired displacement pattern without changing the fundamental vibration mechanism.
2Strength
If the protruding portion mass ratio is increased to enhance peripheral displacement, then foreign matter removal is improved, but the resonant frequency matching becomes difficult
Solution Approach 1:
The invention systematically optimizes the mass ratio parameter of the protruding portion (setting it between 0.05-0.20 of the main body weight) to achieve the desired balance. By adjusting this specific parameter, the system achieves sufficient peripheral displacement for effective foreign matter removal while maintaining proper resonant frequency coordination between the light transmissive body and the vibration source.
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 effectively moves foreign matter from the central to the peripheral portion of the light transmissive body, ensuring clear field of view and efficient removal of liquid droplets, thereby maintaining image quality and functionality.
Implementation Method 1
a ratio between an equivalent mass calculated from a moment of inertia of the protruding portion and a weight of the main body portion is equal to or more than 0.8 and equal to or less than 1.2
Implementation Method 2
the light transmissive body, the first cylindrical body, the spring portion, and the second cylindrical body are configured such that a resonant frequency of the light transmissive body is larger than a resonant frequency of the spring portion
Data Source
Figure 1~2
Figure 2A
Figure 3
AI summary
A vibration device according to the present invention includes a light transmissive body that transmits light of a predetermined wave length, a first cylindrical body that supports the light transmissive body at the one end, a plate-shaped spring portion that supports the other end of the first cylindrical body, a second cylindrical body that supports, at the one end, a position of the spring portion in an outer side portion of a position at which the first cylindrical body is supported, and a vibrating body that is arranged on the other end side of the second cylindrical body and vibrates in a penetrating direction of the second cylindrical body, in which the light transmissive body has a main body portion located on an inner side of a portion supported by the first cylindrical body, and a protruding portion extending from the main body portion toward an outer circumference of the light transmissive body and protruding outward more than a portion supported by the first cylindrical body, a ratio between an equivalent mass calculated from a moment of inertia of the protruding portion and a weight of the main body portion is equal to or more than 0.8 and equal to or less than 1.2, and the light transmissive body, the first cylindrical body, the spring portion, and the second cylindrical body are configured such that a resonant frequency of the light transmissive body is larger than a resonant frequency of the spring portion.