Electronic Watch Depth Indication Segmentation
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Solution Overview
Problem
Electronic watches with meter functions face challenges in expanding the indication range of water depth while maintaining readability, particularly at depths greater than 30 meters, where the pointing hand movement is too small to easily indicate changes in water depth.
Innovation Solution
The electronic watch employs a pressure sensor to detect the start of diving and control motors for two pointing hands, allowing for different indication resolutions based on selected modes, with one hand indicating water depth and the other indicating diving time, and a mode indication unit to select the appropriate mode for easy reading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If meter graduations are provided on the inner circumference of time graduations with one-to-one correspondence from 0 to 30 minutes and double correspondence from 30 to 59 minutes, then the indication range is extended, but the pointing hand movement becomes too small to easily read at depths greater than 30 meters
Solution Approach 1:
The dial is divided into two distinct meter hand systems: a first meter hand for indicating water depth from 0 to 30 meters with 1m per graduation resolution, and a second meter hand for indicating water depth from 0 to 60 meters with 2m per graduation resolution. This segmentation allows the system to provide both high resolution for shallow depths and extended range for deep depths without compromising readability in either regime.
Solution Approach 2:
The system dynamically switches between two different indication modes based on the selected meter mode. When in first meter mode, the first meter hand is activated with 1m per graduation resolution. When in second meter mode, the second meter hand is activated with 2m per graduation resolution. This dynamic switching allows the indication range and resolution to adapt to different diving depth requirements.
2Adaptability or versatility
If the indication unit for water depth is set to 1m from 0 to 30m and 2m from 30m to 80m, then the indication range is extended while maintaining resolution, but it becomes difficult to achieve both expansion of indication range and ease of reading the pointing hand in a compatible manner
Solution Approach 1:
The system segments the measurement function into two distinct meter hands, each optimized for different depth ranges and resolutions. The first meter hand provides 1m per graduation precision for depths up to 30m, while the second meter hand provides 2m per graduation precision for depths up to 60m. This segmentation resolves the contradiction by providing appropriate precision for each depth range rather than attempting to use a single hand for all ranges.
Solution Approach 2:
The system changes the indication parameters by switching between two different meter modes. In the first meter mode, the indication unit is 1m per graduation with a range of 0-30m. In the second meter mode, the indication unit is 2m per graduation with a range of 0-60m. This parameter change allows the system to optimize both reading precision and indication range for different diving scenarios.
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 solution allows for both an expanded water depth indication range and improved readability by switching between modes with different resolution settings, enabling accurate and intuitive display of water depth and diving time information.
Implementation Method 1
a pressure sensor configured to measure pressure
Data Source
AI summary
A method for controlling an electronic watch includes a first pointing hand, a first motor configured to move the first pointing hand, a second pointing hand, a second motor configured to move the second pointing hand, a pressure sensor configured to measure pressure, and a mode indication unit configured to indicate a mode, and when detecting start of diving based on a pressure measured by the pressure sensor, control is performed on the first motor and the second motor to indicate with the first pointing hand a water depth estimated from the pressure and indicate with the second pointing hand a time period of diving for which timing is started after detecting the start of diving, and when the water depth is indicated with the first pointing hand, with a plurality of modes with different indication resolutions being provided, the selected mode is indicated on the mode indication unit.