Watch Optical Sensor Sealing for High-Pressure Waterproofing

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Solution Overview

Problem

Existing detection devices in wristwatches fail to achieve high-pressure waterproofing due to inadequate sealing of light receiving and emitting window sections, which compromises the integrity of biological information detection.

Innovation Solution

A detection device with a light receiving hole and light emitting holes is designed with waterproof members between the outer and inner circumferential surfaces of glass covers and holes, ensuring high-pressure waterproofing by using waterproof packings and blocking sections to enhance detection performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a transparent plate is welded to cover the light receiving hole and light emitting hole, then the detection device can be assembled, but high-pressure waterproofing cannot be achieved

Engineering Contradiction:

Improvewaterproofing performanceVSAvoidsealing structure complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The sealing structure is divided into multiple segments: a waterproof ring with first and second waterproof sections, a waterproof member (gasket) with first and second waterproof portions, and a blocking section. This segmentation allows each component to perform specific sealing functions, achieving high-pressure waterproofing while maintaining manufacturability through modular assembly.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A waterproof member (gasket) is introduced as an intermediary element between the transparent plate and the hole structure. This gasket compresses under pressure to create effective sealing, enabling high-pressure waterproofing without requiring complex welding or sealing structures, thus improving both reliability and ease of manufacture.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the light receiving hole and light emitting hole are sealed to achieve waterproofing, then waterproofing performance is improved, but the detection accuracy may be compromised

Engineering Contradiction:

Improvewaterproofing performanceVSAvoidbiological information detection accuracy

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The sealing structure applies local quality by providing waterproofing only where necessary (at the hole interfaces) while maintaining optical transparency in the light transmission paths. The waterproof ring and gasket seal the periphery without obstructing the light paths, ensuring both high-pressure waterproofing and accurate biological information detection.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The waterproof member (gasket) acts as an intermediary that provides sealing without interfering with optical transmission. It compresses to create waterproof seals while being transparent or translucent to light, thus achieving waterproofing without compromising the detection accuracy of biological information.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If a complex sealing structure is used to achieve high-pressure waterproofing, then waterproofing is improved, but the device complexity increases

Engineering Contradiction:

Improvehigh-pressure waterproofingVSAvoidsealing structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The sealing system is segmented into distinct functional components: a waterproof ring with specialized waterproof sections, a separate waterproof member (gasket), and blocking sections. This segmentation allows each component to be optimized independently and assembled together, achieving high-pressure waterproofing while keeping individual component complexity low and the overall assembly straightforward.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The waterproof member is implemented as a flexible gasket that can be compressed to create effective seals. This flexible thin film approach provides reliable high-pressure waterproofing without requiring rigid complex structures, reducing device complexity while maintaining sealing effectiveness.

Inventive Principle:

Principle #30Flexible shells and thin films

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 solution achieves high-pressure waterproofing and enhances the accuracy and reliability of pulse rate and oxygen saturation detection, while allowing for user-friendly operation and effective waterproof testing.

Implementation Method 1

a waterproof member arranged between an outer circumferential surface of a cover arranged in the light receiving hole or the light emitting hole and an inner circumferential surface of the light receiving hole or the light emitting hole

Methodology Applied

Scientific EffectWaterproof sealing:

Implementation Method 2

a light emitting hole corresponding to a light emitting element

Methodology Applied

Scientific EffectLight emission:

Implementation Method 3

a light receiving hole corresponding to a light receiving element

Methodology Applied

Scientific EffectLight reception:

Data Source

PatentUS12541179B2Detection device and timepiece

Publication Date: 2026.02.03 CASIO COMPUTER CO LTD

AI summary

A detection device including a device main body provided with a light receiving hole corresponding to a light receiving element and a light emitting hole corresponding to a light emitting element, and a waterproof member arranged between an outer circumferential surface of a cover arranged in the light receiving hole or the light emitting hole and an inner circumferential surface of the light receiving hole or the light emitting hole.