Shake Sensor Vibration Isolation in Image Pickup Apparatus
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Solution Overview
Problem
Existing camera designs with shake sensors face challenges in accurately detecting camera shakes due to vibrations from the shutter unit, as the short distance between the shutter unit and shake sensor leads to insufficient vibration restraint, and holding the gyro sensor by the battery box results in a larger battery box and grip portion, compromising image stabilization accuracy.
Innovation Solution
The camera design includes a shake sensor disposed away from the shutter unit in a direction opposite to the shutter blade movement, with the shutter unit and gyro sensor separated by a top cover that acts as a second holder, decoupling vibrations and using a shock absorber to suppress disturbances, ensuring the shake sensor is not directly contacted by the camera body, thereby reducing vibration propagation and maintaining a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the shake sensor is disposed close to the shutter unit to maintain a compact camera form factor, then the camera size is reduced, but vibration from the shutter unit propagates to the shake sensor causing inaccurate detection
Solution Approach 1:
The patent introduces a vibration isolation mechanism as an intermediary between the shutter unit and shake sensor. This mediator consists of vibration isolation members (such as rubber or foam materials) that are disposed between the shutter unit and the shake sensor, absorbing and isolating vibrations from the shutter unit to prevent them from reaching the shake sensor, thereby maintaining detection accuracy in a compact configuration
Solution Approach 2:
The patent extracts the shake sensor from the direct vibration path of the shutter unit by positioning it on a different structural plane or using independent mounting structures. The shake sensor is placed on the imaging unit rather than being directly coupled to the shutter unit structure, separating the detection function from the vibration source
2Measurement precision
If the shake sensor is held by the battery box to isolate it from shutter vibrations, then vibration propagation is reduced, but the battery box and grip portion become larger
Solution Approach 1:
The patent makes the imaging unit serve multiple functions: it acts as both the image capture device and the mounting structure for the shake sensor. By disposing the shake sensor on the imaging unit, the system eliminates the need for a dedicated battery box housing for the sensor, achieving vibration isolation without increasing battery box dimensions
Solution Approach 2:
The patent combines the shake sensor mounting function with the imaging unit structure. The shake sensor is integrated onto the imaging unit rather than being separately housed in the battery box, merging two functions into one component to avoid increasing the battery box size while still achieving vibration isolation
3Productivity
If the contact portion or blade driver is positioned close to the shutter blade for effective deceleration, then shutter control efficiency is improved, but vibration is intensified and propagates to the shake sensor
Solution Approach 1:
The patent introduces vibration isolation members as intermediaries between the shutter unit components (contact portion or blade driver) and the shake sensor. These isolation members absorb the vibration generated during shutter deceleration, allowing efficient shutter control while preventing harmful vibrations from reaching the shake sensor
Solution Approach 2:
The patent converts the harmful vibration generated by shutter deceleration into a beneficial isolation effect by using vibration isolation members. The vibration energy that would otherwise reach the shake sensor is absorbed and dissipated by the isolation materials, transforming a harmful byproduct into a means of protection for the sensitive sensor
Data Source
AI summary
An image pickup apparatus includes an image sensor configured to capture an object image, a shutter unit configured to move a shutter blade in a first direction and to control an exposure time to the image sensor, and a shake sensor configured to detect a shake of the image pickup apparatus. When viewed from an image plane side, the shake sensor is disposed away from the shutter unit in a second direction opposite to the first direction.