Imaging Apparatus Focusing Group Positioning
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Solution Overview
Problem
Imaging apparatuses mounted on moving bodies face challenges in achieving high performance and durability due to restrictions in power arrangement and focusing speed, especially when temperature and environmental conditions change, and when the focusing group needs to adjust to varying distances and orientations.
Innovation Solution
An imaging apparatus with a situation grasping means to adjust the imaging position based on the moving body's conditions, using an optical system that satisfies specific conditional expressions to optimize focusing group movement and reduce power consumption, allowing for high-resolution imaging without requiring subject information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the focusing group is moved after phase difference detection in the solid state image sensor, then phase difference detection can be performed, but focusing speed is reduced
Solution Approach 1:
The patent performs focusing group movement before phase difference detection. The focusing group is driven to a position corresponding to the imaging position calculated from situation information (such as distance to subject) in advance, and only then is phase difference detection performed. This preliminary focusing action eliminates the need to move the focusing group after detection, thereby maintaining high focusing speed while ensuring accurate phase difference detection.
2Measurement precision
If the focusing group is moved according to distance to subject, then focusing accuracy is improved, but durability is reduced due to increased focusing operations
Solution Approach 1:
The patent calculates the imaging position in advance based on situation information (distance to subject, orientation of moving body) before performing focusing operations. The focusing group is driven to this pre-calculated position, which reduces the number of focusing operations needed during actual imaging. This preliminary calculation and positioning approach maintains focusing accuracy while reducing mechanical wear on the focusing group, thereby improving durability.
3Manufacturing precision
If the optical system uses strong restriction on power arrangement, then optical performance is maintained, but design flexibility is reduced
Solution Approach 1:
The patent introduces a conditional expression that relates the focal length of the focusing group to the focal length of the entire optical system. By adjusting this parameter relationship, the system can maintain good optical performance across different temperature environments while allowing greater flexibility in power arrangement. The conditional expression provides a design guideline that balances optical performance with design freedom, enabling optimization based on specific application requirements.
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 high-performance, high-durability imaging by optimizing focusing group movement based on the moving body's situation, reducing focusing time and power consumption, and preventing unnecessary focusing on irrelevant subjects, thus ensuring high-resolution imaging across varying conditions.
Implementation Method 1
an optical system that includes a first lens group having negative refractive power and a subsequent lens group
Data Source
AI summary
A situation grasping means configured to grasp a situation of a moving body, an optical system mounted on the moving body, and a focusing group configured to change an imaging position of the optical system are provided, and the imaging position is changed to a position calculated from a setting value for setting the imaging position according to a situation of the moving body and a situation of the moving body grasped by the situation grasping means, and the optical system satisfies a predetermined conditional expression. Furthermore, the moving body includes the imaging apparatus.