Vehicle Instrument PCB Layout for Weight and Illumination Balance
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Solution Overview
Problem
Existing vehicle instrument devices face challenges in reducing weight and cost due to the close proximity of light sources to dial plates causing excessive illumination and increased component count from separate circuit components.
Innovation Solution
The integration of a main board with independent electronic components and a sub-circuit body directly joined and electrically connected, eliminating the need for connectors and allowing for standardized and miniaturized designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If the light source is installed directly on the back face side of the dial plate, then the thickness and weight of the instrument device are reduced, but the light source becomes too close to the dial plate surface causing excessive illumination intensity
Solution Approach 1:
The patent segments the circuit board into two functional parts: a main board containing control circuitry and a separate dial plate assembly containing the light source. This segmentation allows the light source to be positioned close to the dial plate for weight reduction while maintaining appropriate illumination control through separate circuit board design, resolving the contradiction between weight reduction and illumination intensity control.
2Illumination intensity
If the circuit is divided into main board and dial plate with connector connection, then the light source can be positioned appropriately, but the number of components increases causing cost increase
Solution Approach 1:
The patent merges the main board and dial plate circuit board into a single integrated circuit board structure. The light source mounting area is directly formed on the circuit board at the position corresponding to the dial plate back face, eliminating the need for separate connectors and component assemblies. This merging reduces component count and costs while maintaining appropriate light source positioning and illumination quality.
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 configuration reduces costs and weight by eliminating connectors and enabling standardized production, while maintaining effective light emission and diffusion through appropriate spacing of LEDs.
Implementation Method 1
a light emitting element being configured to illuminate an illuminated section of a dial plate
Implementation Method 2
Patent Document 1 provides an illuminated room layer which causes a light to be diffused
Data Source
AI summary
An objective of the present invention is to provide an instrument device for a vehicle which can reduce the costs and may also achieve a reduced weight. An instrument device for a vehicle includes a main board with an electronic component mounted thereto, the electronic component being independent from a design of a dial plate, and a sub-board with an electronic component mounted in a position corresponding to the design of the dial plate, wherein the main board and the sub-board are directly joined and electrically connected to each other.