Focal Plane Shutter Vibration Control via Counterweight Battery Placement
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Solution Overview
Problem
Digital cameras using focal-plane shutters experience significant vibration, known as shutter shock, particularly with larger image sensors and reduced camera weight, which existing technologies fail to adequately mitigate.
Innovation Solution
A digital camera design with a square focal-plane shutter unit where the charge section is disposed within the grip portion and the battery is positioned at the end of the camera body opposite to the grip, allowing the drive unit to be compact and reducing vibration by increasing the moment of inertia, while the battery is placed between the image sensor and display unit to reduce camera dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the image sensor size is increased, then the imaging quality is improved, but the shutter shock vibration is intensified
Solution Approach 1:
The patent places a battery (weight: 200g) at the rear end of the camera body, opposite to the grip portion, to create a counterweight that offsets the vibration generated by the shutter operation. This counterweight arrangement reduces the shutter shock transmitted to the camera body while maintaining the large image sensor size for high imaging quality.
2Weight of moving object
If the camera weight is reduced, then the portability is improved, but the shutter shock vibration is intensified
Solution Approach 1:
The patent strategically positions the battery as a counterweight at the rear end of the camera body. This arrangement uses the battery's weight (200g) to offset the shutter shock vibration, allowing the camera to maintain reduced overall weight for portability while effectively suppressing vibration through the counterweight effect.
3Device complexity
If the drive unit is compacted, then the device complexity is reduced, but the vibration suppression capability is weakened
Solution Approach 1:
The patent adopts a compact drive unit design by positioning the charge section within the grip portion, simplifying the overall structure. Simultaneously, it places the battery at the rear end as a counterweight to suppress vibration transmission, thereby achieving both structural simplification and effective vibration control.
4Volume of moving object
If the battery is positioned at the rear end, then the camera dimensions are reduced, but the vibration suppression capability must be maintained
Solution Approach 1:
The patent positions the battery at the rear end of the camera body, opposite to the grip portion, which optimizes the camera's dimensional layout. This position also serves as an effective counterweight to suppress vibration transmission, achieving both compact dimensions and vibration control through strategic component placement.
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 configuration stabilizes the shutter operation and effectively suppresses vibration transmission, enhancing the camera's stability and reducing shake during image capture.
Implementation Method 1
a battery which is disposed between the image sensor and the display unit in the camera body, and is disposed at an end portion of the camera body opposite to the end portion of the camera body including the grip portion
Data Source
AI summary
There is provided a digital camera of which the stable operation of a shutter can be performed by compact structure and which can suppress the generation of vibration caused by the operation of a shutter. A grip portion (22) is provided at one end portion of a camera body (10), and a charge section (124) of a focal-plane shutter unit (110) is disposed within a range GA of the grip portion (22). Further, a battery is disposed between an image sensor and a display unit at an end portion of the camera body opposite to the grip portion (22). Since the charge section is disposed within the range of the grip portion, a drive section (122) and the charge section (124) can be disposed close to each other. Accordingly, a drive unit for a focal-plane shutter can be made compact, and a shutter curtain can be charged with a stable operation even in a case in which the shutter curtain is to be charged with large torque. Further, since a portion of the camera body, which is close to the center of rotation of a shutter curtain, can be gripped with a hand at the time of handheld imaging, the generation of vibration can be effectively suppressed.