Optical Device Zoom Lens Control and Collision Prevention
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Solution Overview
Problem
Existing optical zoom systems face challenges in accurately controlling the movement of zoom lens groups, leading to potential collisions and operational inefficiencies due to insufficient resolution in position detection and abnormal control states, which affect the zoom operation and image quality.
Innovation Solution
The optical device incorporates a system with first and second lens groups, position detection units, a storage unit for positional relationships, and a control unit that manages the movement of the second lens group based on detected positions and stored information, enabling detection of abnormal control states and preventing collisions by initializing the third zoom group to a safe position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If analog position detection element is used to detect zoom lens position, then device complexity is reduced, but measurement precision deteriorates leading to insufficient resolution in position detection
Solution Approach 1:
The position detection system is segmented into two independent detection units: a first lens group position detection unit and a second lens group position detection unit. Each unit independently detects the position of its corresponding lens group, providing high-resolution positional information without requiring a single complex detection system. This segmentation allows the use of simpler detection elements while achieving overall high precision through coordinated detection of multiple components.
2Ease of operation
If stepping motor is used to move zoom lens, then ease of operation is improved, but reliability deteriorates due to step-out occurrence during moving operation
Solution Approach 1:
The system implements feedback control by continuously monitoring the actual position of the second lens group using the second lens group position detection unit and comparing it with the expected position based on stepping motor control signals. When a discrepancy is detected (indicating step-out), the control unit generates an abnormality determination signal to correct the positional relationship information, ensuring reliable zoom operation while maintaining ease of use.
Solution Approach 2:
The control unit preliminarily determines the positional relationship between the first and second lens groups based on stored information before actual zoom operation occurs. By pre-establishing expected positional correlations and having detection units ready to verify positions, the system can quickly identify and correct step-out conditions, maintaining reliability while preserving the ease of operation provided by the stepping motor.
3Productivity
If positional relationship information is stored for zoom operation, then productivity is improved through efficient control, but device complexity increases due to additional storage and control units
Solution Approach 1:
The storage unit stores positional relationship information that serves multiple functions: it provides reference data for the control unit to determine expected positions of the second lens group, enables abnormality detection when actual positions deviate from stored relationships, and facilitates quick recovery from step-out conditions. This multi-functional use of the storage unit improves zoom operation efficiency without requiring separate systems for each function, thereby limiting the increase in device complexity.
Data Source
AI summary
An optical device includes a first and second lens group, an operation member, a first and second lens group position detection unit, a storage unit, a control unit. The control unit controls the movement of the second lens group based on positional information of the first lens group detected by the first lens group position detection unit and the positional relationship information stored in the storage unit, and determines whether a control state of the second lens group is abnormal based on control positional information during the control of the movement of the second lens group and the signal corresponding to the position of the second lens group detected by the second lens group position detection unit.