Vibrating Motor Control for Lens Focus Wear Reduction
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Solution Overview
Problem
Vibrating motors used in lens apparatuses for focus lens control experience wear and performance deterioration due to frequent driving instructions, leading to reduced speed responsiveness and a feeling of strangeness in operation.
Innovation Solution
A lens apparatus with a controller that switches between controlling the vibrating motor based on the position instruction and current position of the focus lens, using a threshold to determine when to output driving instructions to the actuator, thereby reducing the frequency of motor activation within the depth of field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the vibrating motor is driven frequently in response to driving instructions, then the responsiveness to operation is improved, but wear on the motor increases
Solution Approach 1:
The patent applies partial action by determining whether motor driving is actually necessary before executing the drive command. When the focus lens is within the depth of field range, the system judges that driving is unnecessary and suppresses the drive instruction, thereby reducing motor wear while maintaining acceptable operation responsiveness.
Solution Approach 2:
The system uses the detector to automatically determine the current focus position and compares it with the depth of field information to self-judge whether driving is necessary. This eliminates the need for frequent motor responses to every operation input, allowing the system to serve itself by intelligent control rather than mechanical response.
2Reliability
If the period for obtaining demand operation quantity is prolonged, then motor wear is reduced, but operation responsiveness deteriorates
Solution Approach 1:
The system performs preliminary judgment by determining in advance whether motor driving is necessary based on the current focus position and depth of field information. This preliminary assessment allows the system to suppress unnecessary drive commands before they are executed, reducing motor wear without waiting for the next sampling period.
Solution Approach 2:
The system uses feedback from the detector about the current focus position to intelligently control motor driving. By continuously monitoring the focus position and comparing it with the depth of field range, the system provides feedback-based control that reduces unnecessary motor activation while maintaining responsiveness when actually needed.
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
This approach reduces wear on the vibrating motor and minimizes the feeling of strangeness in operation by limiting motor activation to only when necessary, maintaining responsiveness and image quality.
Implementation Method 1
a vibrating body which is formed by a metallic elastic member having a mechanical-electrical energy convertor (piezoelectric device, electrostrictive element) joined or the like
Data Source
AI summary
A lens apparatus comprises an optical system including a focus lens, a vibrating motor for driving the focus lens in an optical axis direction, a detector for detecting a position of the focus lens in the optical axis direction, an operating unit for inputting a position instruction for the focus lens, and a controller for, on the basis of the position instruction and a state of the optical system, switching between a case of controlling the motor by using an instruction value which is obtained on the basis of the position of the focus lens obtained from the detector and the position instruction obtained from the operating unit and a case of not controlling the motor by using the instruction value.