Pulse Wave Sensor Contact Recess for Finger Positioning
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Solution Overview
Problem
Existing pulse wave measuring devices face challenges in accurately measuring pulse waves due to difficulty in sensing the contact location and maintaining appropriate pressing force, leading to deviations and inconsistent measurements.
Innovation Solution
A pulse wave measuring device with a contact portion featuring a recess and a protruding lens, which stabilizes finger placement and reduces excessive contact pressure, enhancing signal-to-noise ratio through a tapered recess and annular projection design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the contact portion is made flat and simple, then the device structure is simple, but the user cannot sense the contact location accurately and the fingertip deviates from the contact portion
Solution Approach 1:
The patent applies visual differentiation through color or pattern changes on the contact portion to help users sense and locate the contact area accurately. The contact portion includes a recess with an annular projection that creates distinct visual zones, enabling users to identify where to place their fingertip for accurate pulse wave measurement.
2Force
If no recess structure is provided, then the device structure is simple, but the pressing force becomes uncontrolled and may be excessively large or small
Solution Approach 1:
The patent employs a recess with an annular projection that creates a curved, tapered structure. This curvature design naturally guides the fingertip into proper contact and distributes the pressing force evenly, preventing both excessive and insufficient pressure while maintaining measurement accuracy.
3Object-affected harmful factors
If the contact area is large, then the structure is simple, but ambient light interference increases and signal quality decreases
Solution Approach 1:
The patent segments the contact portion into distinct functional zones: a central recess area for light transmission and an annular projection area for structural support and ambient light blocking. This segmentation allows the device to maintain a compact form factor while reducing ambient light interference through the annular structure that creates a light-shielding barrier.
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 device improves reproducibility and signal quality by stabilizing finger position, reducing ambient light interference, and adjusting contact pressure, resulting in more accurate pulse wave measurements.
Implementation Method 1
a light emitting element and a light receiving element. The light emitting element emits the light to the fingertip that contacts the contact portion. The light receiving element receives a reflected light, which is reflected from the fingertip
Implementation Method 2
or a transmitted light, which is transmitted through the fingertip
Data Source
AI summary
A pulse wave measuring device includes a light emitter unit, a light receiver unit, a pulse wave measuring unit and a contact portion. The light receiver unit receives reflected light, which is reflected from a finger after transmission of the light from the light emitter unit. The pulse wave measuring unit measures a pulse wave based on the reflected light, which is received with the light receiver unit. The finger contacts the contact portion at a time of measuring the pulse wave. The contact portion has a recess, which receives at least a portion of the finger at the time of measuring the pulse wave, and a protrusion is provided in an inside of the recess.