Dual Focus Lens Group Driving for Range and Resolution
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Solution Overview
Problem
Existing camera systems struggle to achieve both the driving range and resolution of focus lenses due to limitations in communication command bit length, leading to restricted movement and precision, especially in systems with multiple focus lens groups.
Innovation Solution
A lens apparatus with separate focus lens groups, where one group with lower precision is driven based on communication commands and the other group is driven with higher precision through internal calculation, allowing for both extended range and high resolution without communication restrictions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the bit length of communication command is limited, then the device complexity is reduced, but the measurement precision of lens position is degraded
Solution Approach 1:
The focus lens system is divided into multiple focus lens groups (first focus lens group and second focus lens group), each with different numbers of stopable positions. The first group uses lower precision control suitable for communication command limitations, while the second group provides higher precision control, collectively resolving the contradiction between communication simplicity and positioning precision.
Solution Approach 2:
Different precision levels are applied to different parts of the focus lens system. The first focus lens group operates with coarser resolution appropriate for communication constraints, while the second focus lens group operates with finer resolution, allowing the system as a whole to achieve high precision without requiring high-precision communication throughout.
2Measurement precision
If the number of stopable positions is increased, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The focus control is segmented into two independent focus lens groups with different numbers of stopable positions. This segmentation allows the system to achieve high overall precision through the second group without requiring the entire system to be controlled at high precision, thereby reducing overall device complexity.
Solution Approach 2:
Instead of controlling all focus lens groups with equal high precision, the system applies partial high-precision action only to the second focus lens group where it is most needed, while the first group uses lower precision control, avoiding unnecessary complexity in the overall control system.
3Adaptability or versatility
If the movable range is widened, then the adaptability is improved, but the measurement precision is degraded
Solution Approach 1:
The focus lens system is divided into multiple groups that can operate independently. The first focus lens group covers a wider movable range for adaptability, while the second focus lens group provides high precision control within its range, allowing the system to achieve both wide focus range and high precision simultaneously.
Data Source
AI summary
An object of the present invention is to provide a lens apparatus, a camera system, and a lens driving method capable of achieving both a driving range and a resolution of a focus lens. A lens group having a large number of stopable positions due to a high driving resolution, a long driving range, and the like may be set as a first focus lens group. In this case, depending on communication restrictions (command bit length) between a camera body and the lens apparatus, the lens apparatus may not be driven at the desired position and resolution. Therefore, in the lens apparatus according to the first aspect of the present invention, a lens having a small number of stopable positions is driven as a first focus lens group through communication, and the second focus lens group is driven without being restricted by a communication command through calculation in the lens apparatus. Thereby, it is possible to achieve both the driving range and the resolution of the focus lens.