Smart Glasses Temple Spring for Constant Clamping Force
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Solution Overview
Problem
Existing smart glasses fail to accommodate users with different head widths, leading to instability or discomfort due to varying clamping forces caused by spring hinges that do not provide a consistent fit.
Innovation Solution
The smart glasses incorporate a coil spring adjustment mechanism that maintains a constant clamping force by utilizing the elastic force characteristic of a coil spring, allowing the frame temples to expand outward within a specific deformation range, ensuring a consistent elastic force for users with varying head sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a spring hinge is used to provide clamping force through compression or stretching, then the frame temples can be adjusted to fit different head sizes, but the clamping force varies significantly with head width leading to poor fitting stability
Solution Approach 1:
The patent changes the elastic parameter characteristics of the spring by selecting specific material properties and geometric dimensions. The spring is designed with an elastic modulus and wire diameter that create a plateau region in the force-deformation curve, maintaining relatively constant clamping force across a range of head widths rather than linearly increasing force with deformation.
Solution Approach 2:
The patent introduces a dynamic adjustment mechanism where the frame temple can rotate relative to the lens frame through a controlled range. This dynamic structure allows the spring to deform and adjust the clamping force in real-time based on the user's head width, while the plateau characteristic ensures the force remains stable throughout the adjustment range.
2Adaptability or versatility
If the frame temple is made adjustable for different head sizes, then universality is improved, but the clamping force becomes inconsistent leading to discomfort or instability
Solution Approach 1:
The spring parameters (wire diameter, coil diameter, number of active coils, elastic modulus) are specifically selected to create a force-deformation relationship with a plateau region. This ensures that as the frame temple adjusts to different head widths, the clamping force remains within a narrow, comfortable range rather than varying significantly.
Solution Approach 2:
The patent uses a simple, inexpensive coil spring structure that can be easily manufactured and replaced if needed. The spring serves as a disposable-like component that provides reliable performance through its inherent elastic properties without requiring complex adjustment mechanisms or expensive materials.
3Device complexity
If a conventional spring hinge is used, then the structure is simple, but the elastic force varies significantly during frame temple expansion
Solution Approach 1:
The patent maintains the simple coil spring structure but carefully selects the parameters (wire diameter d, coil diameter D, number of active coils n, elastic modulus E) to achieve the desired force characteristics. The simple structure is preserved while the parameter optimization creates the plateau region that stabilizes the elastic force during expansion.
Solution Approach 2:
The spring automatically adjusts its deformation to maintain stable clamping force without requiring external control or complex mechanisms. The elastic properties of the spring itself provide the force stabilization, making the system self-regulating and eliminating the need for additional force-control components.
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 design provides a stable and comfortable fit for users with different head widths by maintaining a constant clamping force, enhancing wearing experience and universality.
Implementation Method 1
the working area of the coil spring when the frame temple body is expanded outward is set to be within a range in which an elastic force approaches a constant deformation amount by using an elastic force characteristic of the coil spring
Data Source
Figure 1a~1b
Figure 2~3a(B)
Figure 3b
AI summary
Smart glasses are provided, to provide a basically constant clamping force for users with different head widths. The smart glasses include a lens frame and frame temples. The frame temple includes a frame temple body and a coil spring adjustment part, the coil spring adjustment part includes a coil spring, a first end of the coil spring is connected to the lens frame, and a second end of the coil spring is connected to the frame temple body. The lens frame and the frame temple body are connected to each other through the coil spring, so that a working area of the coil spring when the frame temple body is expanded outward is set to be within a range in which an elastic force approaches a constant deformation amount by using an elastic force characteristic of the coil spring. In this way, a basically constant clamping force relative to the head is provided by a basically constant elastic force generated by deformation of the coil spring, so that the smart glasses can accommodate to the users with different head widths.