Interchangeable Lens Motor Stop Holding Energization Control
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Solution Overview
Problem
Interchangeable lenses face challenges in reducing power consumption and minimizing vibration noise generated by motors during operation, particularly during video capturing, as existing technologies do not effectively manage motor energization to achieve both low power usage and silence.
Innovation Solution
The system employs a communication protocol between the camera and interchangeable lens to manage motor energization, where the camera sends instructions for motor drive and power supply, and the lens maintains a stop holding energization state before transitioning to a power-saving state, thereby reducing vibration noise and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the motor is driven during video capturing, then the lens can be focused and zoomed, but vibration noise is generated
Solution Approach 1:
The camera controller sends a stop holding energization instruction to the lens controller before the motor is actually stopped. This preliminary action causes the motor to maintain a small amount of energization (stop holding energization) that prevents vibration and noise generation during the stopping process, thereby counteracting the harmful vibration noise effect before it fully occurs.
Solution Approach 2:
The system performs preliminary communication between the camera controller and lens controller to coordinate motor control actions. The camera controller proactively sends instructions to the lens controller about upcoming motor operations, allowing the lens controller to prepare appropriate energization levels and timing to minimize vibration noise while maintaining operational functionality.
2Object-generated harmful factors
If the motor is continuously energized to suppress vibration noise, then silence is improved, but power consumption increases
Solution Approach 1:
Instead of fully energizing the motor to eliminate vibration noise, the system applies partial energization (stop holding energization) that is just sufficient to suppress vibration and noise. This partial action approach consumes significantly less power than full continuous energization while still achieving the goal of reducing harmful vibration noise effects.
Solution Approach 2:
The motor operates in periodic cycles of energization and de-energization, with stop holding energization applied only during specific transition phases when vibration noise is likely to occur. This periodic action pattern reduces overall power consumption compared to continuous energization, while still suppressing vibration noise during critical moments.
3Use of energy by moving object
If the lens transitions quickly to power-saving state, then power consumption is reduced, but motor stopping causes vibration noise
Solution Approach 1:
Before the lens transitions to the power-saving state and the motor is completely stopped, the camera controller sends a stop holding energization instruction to the lens controller. This preliminary anti-action maintains minimal motor energization during the transition period, preventing vibration noise that would otherwise occur during rapid motor stopping, while still enabling the system to quickly enter power-saving mode.
4Measurement precision
If the camera and lens communicate extensively to coordinate motor control, then motor control precision is improved, but communication overhead increases
Solution Approach 1:
The camera controller performs preliminary communication with the lens controller to coordinate upcoming motor operations before they execute. This preliminary action establishes the control sequence and timing in advance, improving motor control precision by ensuring proper synchronization, while the communication overhead is minimized by using predetermined instruction formats and protocols.
Data Source
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AI summary
An interchangeable lens (100) detachably attachable to a camera (200) includes a lens communicator (110) configured to perform communication with the camera (200), a motor (108) to move or actuate a driven member (105) included in the interchangeable lens (100), and a lens controller (110). The lens controller (110) is configured to perform, in response to receipt, from the camera (200) through the communication, of a drive instruction to drive the motor (108) and a driving power supply instruction to supply a driving electric power to the motor (108), supply of the driving electric power to the motor (108).