Focal Plane Shutter Attachment Shank Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge in focal plane shutters for cameras is the difficulty in manufacturing thin, durable, and cost-effective attachment shanks made of synthetic resin, which are prone to inclination or damage, and the complexity of forming grooves for lubricant sumps, leading to increased costs and complications in die structure and product processing.
Innovation Solution
The focal plane shutter design involves forming attachment shanks after the shutter base plate, using a two-color molding method with liquid crystal polymer, where the shanks are installed upright with flange parts to enhance stability and form grooves for lubricant sumps along the axial direction, allowing for thinner shanks and reduced die complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If attachment shanks are made thin to reduce size and cost, then manufacturing cost is reduced and device size is minimized, but the shanks become prone to inclination and damage under external forces
Solution Approach 1:
The attachment shank is constructed as a composite structure combining synthetic resin and metal materials. The synthetic resin base provides cost-effectiveness and integration with the shutter base plate, while the embedded metal reinforcement (such as a metal core or wire) provides the necessary mechanical strength and resistance to external forces, preventing inclination and damage despite the thin overall profile.
2Ease of operation
If grooves for lubricant sumps are formed on attachment shanks to reduce friction, then rotation smoothness is improved, but the die structure becomes complex and manufacturing cost increases
Solution Approach 1:
Instead of forming complex grooves throughout the attachment shank, the invention applies lubricant only at specific critical locations where friction occurs during rotation. The lubricant is applied locally at the rotation interface between the attachment shank and the rotation component, eliminating the need for complex die structures while still achieving smooth rotation and reduced friction where it is most needed.
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 approach enables the production of stable, thin attachment shanks that resist external forces and facilitate smooth rotation, improving durability and reducing manufacturing costs by simplifying the die structure and process, while maintaining effective lubrication for rotation components.
Implementation Method 1
using a two-color molding method with liquid crystal polymer
Data Source
AI summary
In the focal plane shutter for cameras, a shutter base plate, an shank for attaching the first blade drive component and the second blade drive component respectively so as to enable to be rotated, an shank for attaching a set component so as to enable to be rotated, and an shank for attaching the first blade and the second blade so as to enable to be rotated respectively are made of synthetic resins. Each of the shanks is fabricated after a shutter base plate was fabricated beforehand, and grooves for sump having cross section of V letter shape are formed at the same interval of angle extending toward the axial direction of the shank at the circumferential side surfaces of the shanks.