Light Control System Using Shared Coil for Drive and Detection
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Solution Overview
Problem
Existing light control systems for small-size image pickup devices lack efficient mechanisms for adjusting optical components, such as lenses and filters, to accommodate variable focal lengths and apertures, and require larger sizes to incorporate driving and detection functions.
Innovation Solution
A light control system comprising first and second substrates with optical apertures, a magnetic rotary shaft member, a spacer, drive means, command means, detection means, switch means, determination means, and control means, which allows the light control means to move between stopping positions using electromagnetic drive and detection of electromotive force for precise control without increasing system size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate detection means are added to detect rotation state, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent combines the detection coil with the drive coil, using the same coil structure for both driving the light control means and detecting its rotation state. The detection function is integrated into the existing drive coil structure, eliminating the need for separate detection components and reducing overall system complexity while maintaining precise rotation detection capability
Solution Approach 2:
The coil structure serves dual functions: it acts as both the drive coil for actuating the light control means and the detection coil for sensing rotation state. This multi-functional design allows a single component to perform multiple tasks, reducing the total number of parts and simplifying the system architecture
2Measurement precision
If multiple separate components are used for driving and detection, then measurement precision is improved, but the system size increases
Solution Approach 1:
The detection coil is merged with the drive coil structure, using the same physical coil for both driving and detection functions. This integration eliminates the need for separate detection components, thereby reducing the overall system size while maintaining accurate rotation detection capability
Solution Approach 2:
The detection function is nested within the existing drive coil structure. The detection coil is positioned to utilize the same magnetic field path as the drive coil, allowing the detection mechanism to be embedded within the existing components rather than adding external detection elements
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
Enables precise control of optical elements between stopping positions, stabilizing operation and reducing size by utilizing the same winding coils for driving and rotation detection, effectively addressing the need for adjustable optical components in small-size devices.
Implementation Method 1
drive means arranged on the first substrate, for causing the light control means to move with supply of current to a coil
Implementation Method 2
detection means for detecting electromotive force generated in the coil
Data Source
AI summary
The light control system includes command means (640) for outputting a command signal indicating a direction of rotation of the light control means (300), detection means (630) for detecting electromotive force generated in a coil (510), switch means (610) for connecting the coil to drive means (500, 302, 620) in a driving state in which current is supplied to the coil and connecting the coil to the detection means in a non-driving state in which electromotive force generated in the coil is detected, determination means (660) for determining a rotational state of a rotary shaft member (302), based on an output signal output from the detection means, and control means (650) for outputting a command for causing the drive means to output a drive signal, based on an output signal output from the determination means.