Camera Shake Correction Using Rear Driver and Power Transmission
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Solution Overview
Problem
Conventional digital cameras with refractive optical systems are prone to camera shake due to their slim design, making it difficult to incorporate a shake correction mechanism without increasing thickness, unlike cameras with linearly arranged lenses which have a built-in shake correction function.
Innovation Solution
An image-taking apparatus with a refractive optical system that includes a shake detection section, a correction lens that moves parallel to the imaging surface, a driver positioned behind the imaging device, and a power transmission system using lens-supporting arms or a cam to correct image blur caused by camera shake, effectively utilizing otherwise wasted space behind the imaging device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a refractive optical system is used to make the camera body slim, then the thickness is reduced, but camera shake becomes more likely to occur
Solution Approach 1:
The patent positions the driver behind the imaging device in the thickness direction, utilizing the space in the optical axis direction rather than arranging components in the lateral direction. This dimensional repositioning allows the driver to be integrated into the camera body without increasing lateral dimensions, enabling shake correction functionality while maintaining the slim profile of the refractive optical system camera.
Solution Approach 2:
The driver is nested within the camera body structure, specifically positioned behind the imaging device where space is otherwise unused. This nesting approach allows the shake correction mechanism to be incorporated into the existing camera body without requiring additional lateral space, thus maintaining the slim form factor while adding the necessary shake correction capability.
2Ease of operation
If drivers are disposed around the lenses of the refractive optical system, then the lenses can be driven for zooming and focusing, but the thickness of the camera body increases
Solution Approach 1:
Instead of arranging drivers around the lenses in the lateral direction (which would increase camera body thickness), the patent repositions the driver behind the imaging device along the optical axis direction. This dimensional change allows the driver to be placed in an otherwise unused space, enabling lens driving functionality without increasing the camera's lateral dimensions.
Solution Approach 2:
The patent introduces a power transmission system that acts as an intermediary mechanism to transmit power from the driver positioned behind the imaging device to the correction lens. This power transmission system enables the driver to control the correction lens despite being spatially separated, allowing the driver to be positioned in the thickness direction without requiring direct lateral access to the lens.
3Reliability
If a shake correction function is added to the refractive type digital camera, then camera shake can be corrected, but the thickness of the camera body increases
Solution Approach 1:
The patent positions the driver behind the imaging device in the thickness direction, utilizing the space along the optical axis rather than expanding the lateral dimensions. This allows the shake correction mechanism to be integrated into the existing camera body structure without increasing the camera's overall thickness, enabling the addition of shake correction functionality to the slim refractive optical system camera.
Solution Approach 2:
The driver positioned behind the imaging device serves multiple functions: it can drive the correction lens for shake correction and can also drive other lenses for zooming and focusing operations. This multi-functionality allows a single driver to provide shake correction capability without requiring additional dedicated components that would increase camera body thickness.
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
The solution enables a thinner digital camera with a refractive optical system while providing a shake correction function, ensuring clear and stable image capture by correcting image blur due to camera shake, thus enhancing the overall shooting experience.
Implementation Method 1
an image-taking optical system that has an objective lens and a reflection member and forms an image on the imaging surface by reflecting subject light coming through the objective lens with the reflection member
Implementation Method 2
a correction lens that is disposed between the objective lens and the imaging device and capable of moving in parallel with the imaging surface thereby correcting a blur in a subject image formed on the imaging surface caused by the shake of the image-taking apparatus
Data Source
AI summary
An image-taking apparatus includes: a CCD having an imaging surface; and an image-taking optical system having an objective lens. The apparatus further includes: a shake detector that detects a shake of the image-taking apparatus; and a correction lens disposed between the objective lens and the CCD and moving in parallel with the imaging surface to correct a blur in an image formed on the imaging surface caused by the shake of the image-taking apparatus. The apparatus further includes: an electromagnet disposed behind the CCD and driving the correction lens; a power transmission system that moves the correction lens by transmitting power from the electromagnet to the correction lens; and a correction-lens controller that causes, based on a detection result from the shake detector, the electromagnet to drive the correction lens such that an image whose blur due to the shake is corrected is formed on the imaging surface.