Hall Sensor Ball Portion Light Shielding Design
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Solution Overview
Problem
Conventional Hall elements are susceptible to variations in characteristics due to light incident on the magnetosensitive portion, leading to issues with current concentration and noise in the output.
Innovation Solution
A Hall sensor design featuring a substrate with a magnetosensitive portion, an insulating film, electrode portions, and ball portions where the projection area of the ball portions accounts for 10% or more of the magnetosensitive portion, effectively blocking light and reducing current concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ball portion is made small, then the device complexity is reduced, but light incident to the magnetosensitive portion causes variation in characteristics
Solution Approach 1:
The patent specifies that the projection area of the ball portion should be 10% or more of the projection area of the magnetosensitive portion. This parameter change ensures sufficient light blocking capability while maintaining a practical device structure, resolving the contradiction between reliability and device complexity.
2Object-affected harmful factors
If the ball portion projection area is increased to block light, then light-induced conductivity variations are suppressed, but the device structure becomes more complex
Solution Approach 1:
By setting the ball portion projection area to 10% or more of the magnetosensitive portion projection area, the patent achieves effective light blocking without excessive structural complexity. This quantitative parameter provides a clear design guideline that balances light shielding performance with manufacturing feasibility.
3Ease of manufacture
If conventional Hall element structure is used, then manufacturing is simpler, but current concentration and noise occur in the output
Solution Approach 1:
The patent introduces a ball portion with specific size requirements (10% or more of magnetosensitive portion area) that creates a localized light-blocking structure. This local modification addresses current concentration and noise issues without fundamentally changing the overall manufacturing process, maintaining ease of production while improving output quality.
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 design suppresses light-induced conductivity variations and current concentration, leading to stable output characteristics and improved noise performance.
Implementation Method 1
a projection area of the ball portion in plan view accounts for 10% or more of a projection area of the magnetosensitive portion... suppresses variation in characteristics of the Hall element caused by light incident to the magnetosensitive portion
Data Source
AI summary
A Hall sensor having a ball portion on a magnetosensitive portion is provided. A Hall sensor is provided, including: a substrate; a magnetosensitive portion formed on the substrate; an insulating film formed on the magnetosensitive portion; an electrode portion formed on the insulating film; and a ball portion which is provided on the electrode portion and is electrically connected to the electrode portion, wherein in plan view, a projection area of the ball portion accounts for 10% or more of a projection area of the magnetosensitive portion. The projection area of the ball portion may account for 20% or more of the projection area of the magnetosensitive portion. A bonding wire which is electrically connected to the ball portion and is extended from the ball portion in a direction perpendicular to an upper surface of the electrode portion may be further included.