Carbon Nanotube Polymer Composite Friction Member for Camera Shutter
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Solution Overview
Problem
Friction members made of polyethylene terephthalate (PET) 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 through a structure of stacked carbon nanotube films or wires, preventing cracking and enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If friction members are made of PET material, then braking force can be calibrated by thickness, but the friction members are damaged by the blade at high shutter speeds, reducing durability and braking performance
Solution Approach 1:
The patent applies composite materials by combining carbon nanotubes with polymer materials (such as PTFE, PET, or Nylon) to create a friction member that maintains the ease of manufacturing and braking force calibration of polymer materials while incorporating the exceptional strength, wear resistance, and durability of carbon nanotubes. This composite structure resolves the contradiction by integrating the advantages of both material types.
Solution Approach 2:
The patent changes the material parameters by incorporating carbon nanotubes into the polymer matrix, fundamentally altering the mechanical properties of the friction member. This parameter change enables the material to withstand high-speed shutter operations while maintaining its braking force calibration characteristics through controlled thickness variations.
2Speed
If shutter blades are made light to achieve high shutter speed, then shutter speed increases, but the brake mechanism requires more durable friction members to handle the increased stress
Solution Approach 1:
The patent uses composite materials with carbon nanotubes embedded in polymer matrices to create friction members that can handle the increased stress from high-speed shutter operations. The carbon nanotubes provide exceptional strength and wear resistance, enabling the brake mechanism to reliably stop lighter, faster-moving blades without compromising durability.
Solution Approach 2:
The patent applies local quality by concentrating the high-strength carbon nanotube reinforcement specifically in the friction member where stress concentration occurs during high-speed operation. This localized enhancement of material properties addresses the durability requirement at the critical braking interface without affecting other parts of the shutter system.
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
the friction members made of PET can be damaged by the blade in the braking process with an acceleration of the shutter speed
Data Source
AI summary
A friction member for a brake mechanism in a camera shutter is provided. The friction member includes a carbon nanotube polymer composite. The carbon nanotube polymer composite includes a polymer and a carbon nanotube structure mixed with the polymer. The carbon nanotube structure includes a plurality of carbon nanotubes joined by van der Waals attraction force. The camera shutter using the friction member is also provided. The camera shutter includes a drive mechanism and a brake mechanism. The drive mechanism includes 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.