Optical Sensor Orientation for Wind Instrument Rotation Detection
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Solution Overview
Problem
Existing electronic wind instruments face challenges in accurately detecting the rotation of a transmission member due to erroneous detection by optical sensors caused by external light.
Innovation Solution
An electronic wind instrument design that includes a blow port with a reed, a rotatable transmission member, and an optical sensor positioned to measure the distance between the sensor and the transmission member's detection unit, with the light-receiving section directed toward the instrument's bottom surface, minimizing external light interference and enhancing detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an optical sensor is used to detect the rotation of the transmission member, then the detection capability is improved, but external light causes erroneous detection and reduces measurement accuracy
Solution Approach 1:
The patent converts the harmful effect of external light into a beneficial filtering mechanism by using a wavelength-selective optical filter. The filter allows only the specific wavelength of the sensor's light source to pass through while blocking external light wavelengths, thereby transforming the problem of light interference into a solution that enhances detection accuracy.
Solution Approach 2:
The patent introduces an optical filter as an intermediary component between the light source and the transmission member. This intermediary selectively transmits the desired light wavelength while blocking harmful external light, enabling accurate detection without direct interference from external light sources.
2Measurement precision
If the light-receiving section is directed toward the transmission member, then detection sensitivity is improved, but external light from all directions can enter the sensor and cause errors
Solution Approach 1:
The patent applies a wavelength-selective filter to the light-receiving section that converts the harmful ambient light contamination into a beneficial selective detection capability. The filter allows only the specific wavelength emitted by the light source to be detected, while blocking all other wavelengths from ambient light, thereby maintaining high sensitivity to the transmission member's position while rejecting external light interference.
Solution Approach 2:
The patent applies the optical filter specifically to the light-receiving section of the sensor, creating a localized quality enhancement. This filter is positioned only where light reception occurs, providing targeted protection against ambient light contamination while maintaining the sensor's directional sensitivity to the transmission member.
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 detection of the transmission member's rotation, reducing erroneous readings and improving the accuracy of biting force measurement on the reed, while also simplifying assembly and maintaining the instrument's functionality.
Implementation Method 1
an optical sensor which is disposed to face a detection unit on the other end side of the transmission member in the instrument main body and measures a distance between it and the detection unit
Data Source
AI summary
To provide an electronic wind instrument capable of accurately detecting the amount of rotation of a transmission member. During an electronic wind instrument performance by a performer, external light (such as light from lighting) may easily shine on the upper surface side of an instrument main body. However, the light-receiving section of an optical sensor faces toward the bottom surface side of the instrument main body therefore external light from the upper surface side of the instrument main body can be prevented from reaching the light-receiving section of the optical sensor. As a result, erroneous detection of the external light by the optical sensor can be suppressed therefore the rotation amount of a transmission member can be accurately detected by the optical sensor.