Electric Shaver Outer Blade with Variable Contact Pressure
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Solution Overview
Problem
Existing electric shavers face difficulties in efficiently raising body hair with small hair rising angles (30° or smaller) due to the challenge of minimizing skin surface damage caused by high contact pressure areas.
Innovation Solution
An electric shaver design featuring an outer blade with varying contact pressures, where the portion exerting high contact pressure has reduced hair raising performance to minimize skin surface impact, while the portion with low contact pressure has enhanced hair raising efficiency, utilizing a bar configuration with hair raising portions that come into contact with hair to raise it from the skin surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hair raising portions with equivalent performance are disposed in both high contact pressure and low contact pressure portions, then body hair can be raised efficiently, but skin surface damage increases
Solution Approach 1:
The patent applies local quality by differentiating the hair raising portion configuration between high contact pressure areas (reducing or eliminating hair raising portions) and low contact pressure areas (maintaining or enhancing hair raising portions). This allows each region to have optimized properties suitable for its specific contact pressure conditions, resolving the contradiction between efficient hair raising and skin protection.
2Productivity
If high contact pressure is applied to raise body hair, then hair raising performance improves, but skin surface impact increases
Solution Approach 1:
The shaver head is segmented into different pressure zones (high contact pressure portions and low contact pressure portions), with each zone having differentiated hair raising portion characteristics. This segmentation allows the system to optimize hair raising performance in low pressure areas while minimizing skin impact in high pressure areas.
Solution Approach 2:
Different regions of the shaver head are assigned different functional qualities - low contact pressure portions have enhanced hair raising portions for efficient hair elevation, while high contact pressure portions have reduced or modified hair raising portions to prevent skin damage from combined high pressure and aggressive hair raising action.
Data Source
AI summary
An electric shaver includes: a main body; an outer blade provided to an end of the main body and having a blade hole defined by a bar; and an inner blade provided inward of the outer blade and configured to reciprocate in a longitudinal direction of the outer blade to cut hair in the blade hole with the outer blade. The bar has a hair raising portion coming in contact with hair upon movement of the outer blade on a skin surface to raise hair up from the skin surface. A contact pressure on the skin surface to be exerted by the outer blade in a first portion of the outer blade is greater than that in a second portion of the outer blade. Hair raising performance in raising hair up from the skin surface in the first portion is smaller than hair raising performance in the second portion.