Focal Plane Shutter Buffer Groove Impact Absorption
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Solution Overview
Problem
Focal plane shutters with buffering members to absorb impact during shutter stopping face issues of positional accuracy variation, adhesion, and deformation due to material properties and size variations, leading to potential damage and timing delays in exposure periods.
Innovation Solution
A focal plane shutter design incorporating an elastically deformable buffering member that temporarily abuts and then spaces from the drive arm or shutter, using a combination of drive levers, actuators, and positioning elements to manage impact absorption and maintain positional accuracy, preventing adhesion and deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a buffering member is provided to absorb impact during shutter stopping, then impact absorption is improved, but positional accuracy of the stop position deteriorates due to size variation of the buffering member
Solution Approach 1:
A buffer groove is introduced as an intermediary structure between the drive arm and the buffer member. The buffer groove guides and constrains the buffer member's movement, ensuring that even when the buffer member deforms elastically, its movement remains within controlled boundaries. This intermediary structure prevents the buffer member from directly affecting the stop position accuracy while still providing impact absorption.
Solution Approach 2:
The buffering mechanism transitions from a rigid stop to an elastic deformation process. The buffer member is designed to elastically deform under impact, changing its physical state temporarily to absorb shock, then return to its original position. This parameter change (from rigid to elastic) allows impact absorption without permanent displacement that would affect positioning accuracy.
2Object-affected harmful factors
If a buffering member is provided to absorb impact, then impact absorption is improved, but adhesion between the shutter/drive arm and buffering member occurs due to material properties
Solution Approach 1:
The buffer groove acts as an intermediary that prevents direct contact and adhesion between the drive arm/shutter and the buffer member. By guiding the buffer member's movement within the groove, the design ensures that the buffer member contacts the groove walls rather than the drive arm or shutter, eliminating the adhesion problem while maintaining impact absorption functionality.
3Object-affected harmful factors
If a buffering member is provided to absorb impact, then impact absorption is improved, but deformation of the shutter or drive arm occurs due to prolonged abutment
Solution Approach 1:
The buffer groove serves as a protective intermediary structure that prevents the buffer member from directly abutting against the drive arm or shutter for extended periods. The groove's geometric constraints ensure that the buffer member remains seated within the groove during deformation, preventing transfer of deforming forces to the drive arm or shutter components.
Solution Approach 2:
The buffer member undergoes temporary elastic deformation to absorb impact, then returns to its original shape. This reversible parameter change allows the buffer member to absorb impact energy without causing permanent deformation to the drive arm or shutter, as the buffer member itself is designed to withstand and recover from the deformation stresses.
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 design effectively absorbs impact, maintains positional accuracy, and prevents deformation, ensuring consistent exposure periods and operational reliability by temporarily engaging the buffering member only during stopping, thus addressing the limitations of traditional buffering systems.
Implementation Method 1
a buffering member (G) elastically deformable
Data Source
AI summary
A focal plane shutter includes: a board including an opening; a shutter opening and closing the opening; a drive source driving the shutter; a drive lever driven by the drive source; a drive arm connected to the drive lever and driving the shutter; a restriction portion defining a stop position of the drive lever; and a buffering member elastically deformable, wherein, when the drive lever drives, abuts the restriction portion, and stops, at least one of the drive arm and the shutter temporarily abuts the buffering member, is spaced from the buffering member, and stops.