Focal Plane Shutter Curtain Control for Slit Exposure
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Solution Overview
Problem
Current focal plane shutter devices cannot perform slit exposure using both front and rear curtains while maintaining the opening part shielded during curtain retraction, limiting their functionality in photography applications.
Innovation Solution
A focal plane shutter device comprising a shutter base plate, front and rear curtains, elastic members, and a drive unit that allows the front curtain to be moved between covered and uncovered positions, and the rear curtain to be held in a covered position, enabling slit exposure by retracting the front curtain while maintaining the opening part shielded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the front curtain is retracted to enable slit exposure photography, then the device's functionality for continuous shooting and live view is improved, but the opening part cannot be kept shielded during curtain retraction, which worsens the control over light exposure
Solution Approach 1:
The shutter mechanism is divided into two independent curtains (front curtain and rear curtain) that can be controlled separately. The front curtain can be retracted while the rear curtain remains in place to shield the opening, allowing slit exposure functionality while maintaining control over light exposure through independent curtain positioning.
Solution Approach 2:
The drive unit is designed to dynamically control the positioning of both curtains independently, allowing the front curtain to be retracted for slit exposure while the rear curtain maintains shielding. The system can switch between different operational modes (full exposure, slit exposure, shielded) by adjusting curtain positions dynamically.
2Productivity
If the front curtain is retracted for slit exposure, then photography functionality is improved, but maintaining the opening part shielded during retraction becomes difficult, worsening the structural control
Solution Approach 1:
The shutter system is segmented into two independently controllable curtains, allowing the front curtain to be retracted for continuous shooting while the rear curtain maintains shielding. This segmentation enables sophisticated control patterns without requiring a completely complex redesign of the basic shutter mechanism.
Solution Approach 2:
The drive unit is designed with multi-functionality to handle various operational modes (full exposure, slit exposure, shielded positions) using the same basic mechanism. This universal design approach enables continuous shooting capability while managing structural control through a consolidated drive system rather than separate mechanisms for each function.
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
Enables slit exposure photography with improved functionality by allowing the front curtain to be retracted while maintaining the opening part shielded, enhancing the device's capability for continuous shooting and live view functions.
Implementation Method 1
a first urging member configured to apply an urging force to the front curtain to move the front curtain from the first front curtain position to the second front curtain position
Implementation Method 2
a second urging member configured to apply an urging force to the rear curtain to move the rear curtain from the first rear curtain position to the second rear curtain position
Implementation Method 3
The drive unit is configured to apply a first biasing force to the first urging member to resist the urging force of the first urging member and apply a second biasing force to the second urging member to resist the urging force of the second urging member
Data Source
AI summary
A focal plane shutter device includes a shutter base plate having an opening part, a front curtain, a first elastic member, a rear curtain, a second elastic member, and a drive unit. The front curtain is movable between a first and second position to cover and uncover the opening. The first urging member is configured to move the front curtain between the first and second positions. The rear curtain is movable between a first and second position to cover and uncover the opening. The second urging member is configured to move the rear curtain between the first and second positions. The drive unit is configured to resist the first and second urging members. The drive unit is also configured to hold the front curtain at the second position when resisting the first urging member and hold the rear curtain at the first position when resisting the second urging member.