Heart Rate Module PCB Assembly with Hot Melt Positioning
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Solution Overview
Problem
Existing heart rate meters have complex assembly methods and high requirements for terminal products, necessitating precise structural adjustments and custom algorithm development.
Innovation Solution
A heart rate module comprising a housing structure with a PCB assembly, a rear housing, and a light-transmitting cover plate, where the PD and LED are fixed at preset distances using hot melt positioning columns, and grating baffles prevent light interference, allowing for efficient assembly and integration into a semi-finished product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the PD and LED are mounted separately on FPC soft board and PCB hard board with separate adjustment of spacing, then the optical components can be independently positioned, but the assembly process becomes complicated and requires fine structural spacing adjustments
Solution Approach 1:
The patent integrates the PD and LED mounting onto a single PCB substrate, combining what were previously separate FPC and PCB assemblies. This merging eliminates the need for separate spacing adjustments between different board types and simplifies the overall assembly process while maintaining optical component positioning capability.
Solution Approach 2:
The PCB is pre-designed with predetermined spacing for PD and LED mounting positions during the board fabrication stage. This preliminary action eliminates the need for fine structural spacing adjustments during final assembly, as the correct distances are built into the PCB structure itself.
2Adaptability or versatility
If separate mounting of PD and LED on different boards is used, then component placement flexibility is maintained, but terminal products require fine structural spacing to match the adjustment
Solution Approach 1:
The PCB is manufactured with pre-determined optimal spacing between PD and LED mounting locations. This preliminary design action ensures that the structural spacing is precisely controlled during PCB fabrication, eliminating the need for high-precision adjustments during terminal product assembly while maintaining component placement flexibility.
Solution Approach 2:
The patent changes the mounting parameter from separate board assemblies requiring fine adjustment to a single PCB with fixed optimal spacing. This parameter change transforms the spacing control from a post-assembly adjustment problem to a controlled manufacturing parameter built into the PCB design.
3Ease of manufacture
If PD and LED are separately assembled on different boards, then individual component optimization is possible, but terminal customers are required to separately develop algorithm writing
Solution Approach 1:
The patent combines the PD and LED onto a single PCB assembly, creating an integrated optical module that can be treated as a unified component. This integration simplifies the system for terminal customers, who now only need to interface with a single assembled unit rather than coordinating separate board assemblies and their respective algorithms.
Solution Approach 2:
The integrated PCB assembly with predetermined spacing creates a universal module that can be directly applied across different terminal products. This multi-functional design eliminates the need for customers to separately develop algorithms for different mounting configurations, as the standardized assembly provides consistent optical geometry.
4Productivity
If integrated module with preset distances is used, then assembly efficiency is improved, but the housing structure and positioning mechanisms are required
Solution Approach 1:
The PCB assembly is prepared in advance with all optical components mounted at their predetermined optimal positions during PCB fabrication. This preliminary action allows the integrated module to be assembled into the housing as a complete unit, significantly improving assembly efficiency while the housing structure provides the necessary positioning and support features.
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
Simplifies the assembly process for terminal customers, improving design and production efficiency by presetting optical distances and structures, reducing the complexity of optical adjustments and interferences.
Implementation Method 1
a hot melt positioning column is disposed on the rear housing, and the PCB assembly is fixed on the rear housing through the hot melt positioning column
Implementation Method 2
a light-transmitting cover plate, wherein a PCB assembly is disposed in the housing structure
Implementation Method 3
grating baffles for preventing light interferences are respectively formed between the through-slots
Data Source
AI summary
A heart rate module, comprising a housing structure composed of a rear housing (2) and a light-transmitting cover plate (3), the housing structure being internally provided with a PCB assembly (1); the PCB assembly (1) comprises a PCB, PDs (6, 7) and an LED (5), the PDs (6, 7) and the LED (5) being fixed on the PCB according to a preset distance; a hot melt positioning column (21) is provided on the rear housing (2), and the PCB assembly (1) is fixed, by means of the hot melt positioning column (21), on the rear housing (2). Use of the heart rate module can solve the problems of the assembly method of the available heart rate meter being complicated and the requirement for a terminal product being high.