Focal Plane Shutter Iron Piece Posture Control
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Solution Overview
Problem
Focal plane shutters experience variations in the posture of an iron piece, leading to inconsistent timing and potential noise and image quality issues due to the iron piece's posture not being maintained constant during reciprocation.
Innovation Solution
A focal plane shutter design that includes a drive lever with a first biasing member for axial movement and a second biasing member to urge the iron piece against a guide portion, ensuring the iron piece is biased in both axial and radial directions, maintaining its posture and consistent abutment with the electromagnet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the drive lever reciprocates for a short period, then the shutter operation speed is improved, but the posture of the iron piece cannot be maintained constant leading to timing variation
Solution Approach 1:
A guide portion is introduced as an intermediary component between the iron piece and the drive lever. The guide portion constrains the iron piece to move along a predetermined path, ensuring that the posture of the iron piece remains constant during reciprocation even at high speeds. The guide portion acts as a mediator that transfers motion while maintaining positional accuracy.
Solution Approach 2:
The patent changes the geometric parameters of the drive lever structure by adding the guide portion with specific dimensions and positioning. This structural parameter change ensures that the iron piece maintains a constant posture relative to the electromagnet during operation, resolving the timing variation issue while preserving fast shutter operation.
2Productivity
If the iron piece posture varies during reciprocation, then the shutter can operate, but the timing when the iron piece is moved away from the electromagnet becomes inconsistent
Solution Approach 1:
The guide portion serves as a precision intermediary that ensures the iron piece follows an exact trajectory. This intermediary component guarantees that the distance and angle between the iron piece and electromagnet remain constant, thereby ensuring precise and consistent timing for blade activation while maintaining continuous shutter operation.
Solution Approach 2:
The guide portion is designed with predetermined geometric constraints that pre-compensate for potential posture variations. By establishing the correct geometric relationship between the iron piece and electromagnet before operation begins, the system ensures consistent timing without requiring active correction during operation.
3Device complexity
If the iron piece is not properly guided, then the structure can be simpler, but dust is generated and image quality degrades
Solution Approach 1:
The guide portion acts as a containment intermediary that restricts the iron piece to a precise movement path. This prevents the iron piece from deviating and generating dust particles that would degrade image quality. The guide portion efficiently contains the moving component without requiring complex external containment structures.
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 maintains the posture of the iron piece constant, ensuring consistent timing and reduced noise, preventing dust generation and image quality degradation, while allowing for miniaturization and stable operation of the shutter.
Implementation Method 1
an electromagnet; a drive lever holding an iron piece, the magnetic attraction force being generated between the iron piece and the electromagnet
Implementation Method 2
a first biasing member biasing the iron piece in an axial direction of the spindle portion
Data Source
AI summary
A focal plane shutter includes: an electromagnet; a board including an opening; a blade movable between a position where the blade recedes from the opening and a position where the blade covers at least part of the opening; and a drive lever driving the blade, and including: a spindle portion provided at its one end with a flange portion; an iron piece provided at the other end of the spindle portion and capable of being adsorbed to the electromagnet; a support portion including a through hole through which the spindle portion penetrates with a play; and a guide portion provided along the iron piece.