Lens Apparatus Movement Base for Stable Zoom Focusing
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Solution Overview
Problem
Existing lens drive assist configurations in lens apparatuses result in a larger motor drive amount and size due to inconsistent in-focus positions between wide-angle and telephoto ends, leading to increased lens apparatus size and potential vibration during focusing.
Innovation Solution
A lens apparatus design with a first and second urging member configuration that stabilizes the movement of lens units, reducing the motor drive amount and overall size by optimizing the moment and urging forces, and integrating the motor movement base with the seventh lens unit for stable, compact operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the focus lens is driven by the lens drive assist configuration with constant base drive amount, then the in-focus position can be maintained across zoom ranges, but the motor drive amount increases and lens apparatus size increases
Solution Approach 1:
The patent applies dynamics by making the base drive amount variable rather than constant. The base drive amount is dynamically adjusted based on the zoom position and subject distance, allowing the lens apparatus to adapt the drive parameters in real-time. This resolves the contradiction by enabling small lens apparatus size through reduced motor drive amount while maintaining in-focus position accuracy through intelligent control algorithms.
Solution Approach 2:
The patent changes the parameter of base drive amount from a fixed constant value to a variable parameter that depends on zoom position and subject distance. By implementing parameter changes in the control system, the lens apparatus can optimize the motor drive amount for each operating condition, thereby reducing overall size while maintaining focusing accuracy across different zoom ranges.
2Device complexity
If the base drive amount is constant regardless of subject distances, then the lens drive assist configuration is simple, but the motor drive amount increases leading to larger lens apparatus
Solution Approach 1:
The patent implements parameter changes by making the base drive amount dependent on zoom position and subject distance. This allows the system to maintain relatively simple mechanical structure while reducing motor drive amount through intelligent parameter adjustment, thereby resolving the contradiction between configuration simplicity and apparatus size.
Solution Approach 2:
The system dynamically adjusts the base drive amount based on operating conditions rather than using a fixed constant. This dynamic approach allows the lens apparatus to reduce motor drive amount for smaller size while keeping the control logic manageable, resolving the contradiction between structural simplicity and compact size.
3Measurement precision
If the focus lens is driven with larger motor drive amount, then the in-focus position can be maintained across zoom ranges, but vibration during focusing increases
Solution Approach 1:
The patent applies dynamics by dynamically adjusting the base drive amount according to zoom position and subject distance. This dynamic control allows the system to use smaller motor drive amounts appropriate for each operating condition, thereby reducing vibration during focusing while maintaining in-focus position accuracy through coordinated lens unit movements.
Solution Approach 2:
The system changes the motor drive parameters dynamically based on operating conditions. By adjusting the base drive amount and motor drive amount coordinates according to zoom position and subject distance, the patent reduces harmful vibrations while maintaining focusing accuracy, resolving the contradiction between precision and vibration control.
Data Source
AI summary
A lens apparatus includes a drive unit to drive a second lens barrel in an optical axis direction, a connection member to connect the second lens barrel and the drive unit, a movement base to hold the drive unit and move the drive unit in the optical axis direction with respect to a first lens barrel, and a second urging member to urge the movement base against the first lens barrel in a direction orthogonal to a plane passing through first, second, and third support portions. The connection member moves in a direction intersecting with a line connecting the first and second support portions. A moment by an urging force of the second urging member about an axis connecting the first and second support portions is greater than a moment by an urging force of the first urging member about the axis connecting the first and second support portions.