Focal Plane Shutter with Preliminary Blade Locking for Faster Continuous Shooting
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Solution Overview
Problem
Conventional focal plane shutters require time for transferring imaging information to a storage device before starting the cocking operation, which delays the next shooting and is not suitable for immediate or continuous shooting modes.
Innovation Solution
A focal plane shutter design that allows switching between normally open and normally closed methods, where the first blade stays away from the exposure opening during cocking and covers it upon return, and the second blade is locked to prevent rotation until the cocking operation is complete, enabling faster transition to the next shooting state without considering imaging information transfer time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cocking operation waits for imaging information transfer to complete before starting, then data integrity is ensured, but shooting speed and frame rate deteriorate
Solution Approach 1:
The second blade performs preliminary action by covering the exposure opening before the cocking operation starts, preventing light from reaching the image sensor during data transfer. This allows the cocking operation to proceed immediately without waiting for imaging information transfer, resolving the contradiction between data integrity and shooting speed
Solution Approach 2:
The shutter operation is segmented into independent phases: the second blade covers the opening during cocking, while the first blade handles exposure. This segmentation allows parallel execution of data transfer and cocking preparation, improving productivity without compromising reliability
2Productivity
If the second blade stays away from the exposure opening during cocking, then continuous shooting is enabled, but light leakage risk increases
Solution Approach 1:
The second blade performs preliminary action by covering the exposure opening before the cocking operation starts, preventing light from reaching the image sensor during data transfer. This allows the cocking operation to proceed immediately without waiting for imaging information transfer, resolving the contradiction between data integrity and shooting speed
Solution Approach 2:
The second blade acts as an intermediary element between the light source and the image sensor during the cocking operation. It temporarily blocks light paths that would otherwise cause leakage, enabling the first blade to move freely for continuous shooting operations
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 enables faster continuous shooting and higher frame rates by allowing the cocking operation to start immediately after exposure, independent of imaging information transfer, and ensures the shutter is ready for the next shot sooner.
Implementation Method 1
a second blade-driving mechanism which comprises a second blade-driving unit and a second blade-driving spring, and in which the second blade is connected directly to the second blade-driving unit, and the two blade-driving units are rotated by the elastic forces of the first blade-driving and second blade-driving springs respectively
Implementation Method 2
a second blade-driving first unit which engages with and is locked by a locking unit in a cocking operation of the cocking unit so as to keep a second blade covering the exposure opening
Data Source
AI summary
A focal plane shutter includes: a first blade-driving unit that makes switches between normally open and normally closed methods; a second blade-driving first unit engaging with and locked by a locking unit in a cocking operation of the cocking unit so as to keep a second blade covering the exposure opening, and making the second blade move away from the exposure opening when the second blade-driving first unit is released from the engagement with the locking unit just before the cocking unit reaches to its cocking position; and a second blade-driving second unit rotated by the cocking operation of the cocking unit in a direction bringing the second blade-driving second unit to its cocking state, and rotating the second blade-driving first unit in a direction in which the second blade-driving first unit is made to perform its exposure operation, so as to make the second blade cover the exposure opening.