Carbon Nanotube Composite Friction Member for Camera Shutter Braking
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Solution Overview
Problem
Friction members made of polyethylene terephthalate (PET) used in camera shutter brake mechanisms are prone to damage at high shutter speeds, leading to reduced braking performance and durability.
Innovation Solution
A friction member composed of a carbon nanotube polymer composite, where carbon nanotubes are integrated with a polymer such as PET, providing a stable friction force and high mechanical strength, preventing cracking and enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If PET friction members are used in the brake mechanism, then the braking force can be calibrated, but the friction members are damaged by the blade during high-speed shutter operation
Solution Approach 1:
The patent applies composite materials by combining carbon nanotubes with PET polymer to create a friction member that integrates the high strength and durability of carbon nanotubes with the friction properties of PET. This composite structure prevents the friction member from being damaged by the blade during high-speed operation while maintaining proper braking force calibration.
Solution Approach 2:
The patent changes the material parameters of the friction member by incorporating carbon nanotubes at specific concentrations (5-50 wt%) into the PET matrix. This parameter change transforms the material properties to achieve both high durability and maintained braking performance under high-speed conditions.
2Ease of operation
If PET friction members are used, then the brake mechanism can function, but the initial braking performance cannot be maintained and the shutter blade can be damaged
Solution Approach 1:
The composite structure of carbon nanotubes and PET provides both functional braking capability and stable performance maintenance. The carbon nanotubes reinforce the PET matrix, preventing degradation during operation and ensuring braking performance remains consistent from initial use through extended operation.
Solution Approach 2:
The carbon nanotube reinforcement acts as a preventive measure that cushions against potential damage before it occurs. The strong carbon nanotube network is built into the PET friction member from the start, protecting against blade damage during high-speed operation and maintaining braking performance stability.
3Ease of operation
If PET friction members are used, then the brake mechanism operates, but the durability of the shutter is extremely decreased
Solution Approach 1:
The carbon nanotube-PET composite material dramatically extends shutter durability by preventing friction member degradation. The carbon nanotubes provide structural reinforcement that resists wear and damage during repeated high-speed operation, ensuring the shutter maintains functionality over extended periods.
Solution Approach 2:
By changing the material composition parameter to include carbon nanotubes (5-50 wt%), the friction member achieves enhanced durability that directly extends the operational lifespan of the shutter, maintaining proper function throughout extended use.
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 carbon nanotube polymer composite friction members offer improved wearability and durability, maintaining braking performance and extending the lifespan of camera shutters by utilizing the exceptional mechanical properties of carbon nanotubes.
Implementation Method 1
The friction member includes a carbon nanotube polymer composite. The carbon nanotube polymer composite includes a carbon nanotube structure and a polymer.
Implementation Method 2
A friction member for a brake mechanism of a camera shutter... provide a stable friction force for a brake lever in the brake mechanism
Data Source
AI summary
A friction member for a brake mechanism in a camera shutter is provided. The friction member includes at least two carbon nanotube composite layers stacked on each other, each carbon nanotube composite layer includes a polymer and a carbon nanotube structure including a number of carbon nanotubes substantially oriented along a same direction. An angle defined by the carbon nanotubes oriented along the same direction in adjacent carbon nanotube composite layers ranges from greater than 0 degrees, and less than or equal to 90 degrees. The camera shutter using the friction member is also provided. The camera shutter includes a brake mechanism and a drive mechanism including a blade driving lever having a moving path. The brake mechanism includes two abovementioned friction members and a brake lever clamped between the two friction members. The brake lever is located at a termination of the moving path to brake the blade driving lever.