Laptop Chassis Projection Part for Torsion Rigidity and Antenna Placement
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Solution Overview
Problem
The challenge is to enhance the torsion rigidity of the display section chassis in laptop PCs while minimizing the impact load on the hinge mechanism during opening and closing, and to maintain better antenna characteristics without increasing the thickness of the chassis.
Innovation Solution
A projection part is added to the edge of the display section chassis that projects onto the operation control section chassis, and a step part is provided on the operation control section chassis to receive this projection, allowing for enhanced torsion rigidity and reduced impact load without increasing the overall thickness. Additionally, the antenna substrate is positioned perpendicular to the display screen within a cavity in the chassis edge, maintaining antenna performance without enlarging the escutcheon width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the first chassis is made thinner to reduce overall device thickness, then the device becomes thinner and lighter, but the torsion rigidity of the first chassis decreases
Solution Approach 1:
The patent introduces a projection part that extends in the thickness direction (third dimension) from the first chassis toward the second chassis. This dimensional extension provides structural reinforcement for torsion resistance without increasing the planar dimensions, thereby maintaining the thin profile while improving torsion rigidity.
Solution Approach 2:
The first chassis is segmented into a main body portion and a projection part. The projection part acts as a separate structural element that can be optimized for torsion resistance independently from the overall chassis thickness, allowing the main body to remain thin while the projection provides the necessary rigidity.
2Reliability
If the width of the escutcheon part is enlarged to increase distance from antenna substrates to display screen, then antenna characteristics improve, but the display screen size is reduced
Solution Approach 1:
Instead of increasing the lateral distance (in-plane dimension) between antenna substrates and display screen by enlarging the escutcheon part, the patent utilizes the thickness direction (third dimension) by positioning antenna substrates on the projection part. This vertical separation achieves the required distance for good antenna characteristics without compromising display screen area.
3Strength
If the hinge mechanism is made sufficiently firm to endure impact load, then the hinge can withstand drops and impacts, but the device becomes heavier and thicker
Solution Approach 1:
The projection part serves as a pre-positioned structural element that absorbs and distributes impact loads before they reach the hinge mechanism. By providing this intermediate load-bearing structure, the hinge mechanism can be designed with reduced strength requirements, thereby reducing its weight and allowing for a thinner overall device.
Data Source
AI summary
There is provided a laptop personal computer comprising: a first chassis 11 accommodating a display section and having a basic shape of substantially rectangle in a planar view; a second chassis 31 accommodating an operation control section and having a basic shape of substantially rectangle in a planar view; and a hinge mechanism 20 for coupling one side 31r of the second chassis and one side 11r of the first chassis and supporting both chassis in a relatively openable and closable manner, wherein the first chassis is provided with a projection part 19 at an edge portion of an other side 11f opposing to the one side 11r, the projection part is formed along the other side and projects to the second chassis side in a state where the first chassis is closed together with the second chassis.