Electric Shaver Head Section Linear Actuator Design
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Solution Overview
Problem
Conventional electric shavers have limited ability to follow the skin, which affects shaving performance.
Innovation Solution
The electric shaver design includes a head section with a height dimension smaller than its front-back dimension, featuring a linear actuator with a compact stator and coils aligned orthogonally, allowing the center of gravity to be near the swing shaft, enabling improved skin-following capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the head section height dimension is reduced to improve skin-following ability, then the center of gravity can be positioned near the swing shaft for better performance, but the linear actuator requires sufficient space to maintain driving force
Solution Approach 1:
The linear actuator is reoriented from a vertical arrangement to a horizontal arrangement, with the coil axis extending in the front-back direction rather than the height direction. This dimensional change allows the actuator to fit within the constrained height space while maintaining its driving capability through the reconfigured magnetic field geometry.
Solution Approach 2:
The actuator main section employs an asymmetric design where the coil axis orientation is changed from the conventional vertical alignment to a horizontal alignment. This asymmetric configuration enables the actuator to achieve the required driving force while occupying minimal height space, thereby allowing the head section height to be reduced below the front-back dimension.
2Ease of operation
If the linear actuator is designed with coils aligned in the front-back direction to reduce height dimension, then the skin-following ability improves, but the actuator structure becomes more complex
Solution Approach 1:
The coil arrangement is changed from the conventional vertical orientation to a horizontal orientation with the coil axis extending in the front-back direction. This dimensional reconfiguration, while altering the internal structure, actually simplifies the overall actuator design by eliminating the need for complex vertical stacking mechanisms and allowing a more straightforward magnetic field generation approach.
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 design enhances the head section's ability to follow the skin, improving shaving performance by reducing the height dimension of the actuator and maintaining driving force, thus providing a more efficient shaving experience.
Implementation Method 1
The linear actuator has an actuator main section and a drive coupling section protruding from the actuator main section and coupled to the inner blades. The actuator main section includes a movable element and a stator that includes a plurality of coils
Data Source
AI summary
A height dimension D1 of a head section 4 is smaller than a front-back dimension D2 of the head section 4. The head section 4 has therein a linear actuator 12 as a drive source. Inner blades 13 are coupled to a drive coupling section protruding form an actuator main section. A height dimension of the actuator main section is smaller than a front-back dimension of the actuator main section.