Reflective Module Holder Shape for Compact Camera OIS
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Solution Overview
Problem
There is a challenge in miniaturizing camera modules for portable electronic devices while maintaining performance features like autofocusing and optical image stabilization, as adding these functions increases the module's size, making it difficult to reduce the thickness of the device.
Innovation Solution
A reflective module with a holder, magnets, coils, and position sensors is used to accurately sense the position of a reflective member, allowing the camera module to rotate and correct shaking, while being designed to fit within the device's thickness, thereby maintaining performance without increasing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If functions such as autofocusing and optical image stabilization are added to a camera module, then performance is improved, but the size of the camera module increases
Solution Approach 1:
The patent employs a reflective member (mirror) to redirect light at a 45-degree angle, changing the optical path from a linear thickness-direction arrangement to a folded path that accommodates multiple lenses and stabilization components within the same thickness envelope. This dimensional reconfiguration allows OIS and AF functions to coexist without increasing device thickness.
Solution Approach 2:
The camera module implements a nested arrangement where multiple lenses are stacked in the thickness direction, and the reflective member is positioned to redirect light from these nested lenses to the image sensor. This nesting strategy allows multiple functional elements to occupy overlapping spatial volumes, reducing the overall footprint while maintaining performance.
2Reliability
If a reflective member is used to correct shaking by rotation, then optical image stabilization performance is improved, but accurate position sensing becomes more difficult
Solution Approach 1:
The patent replaces mechanical position sensing mechanisms with magnetic field-based Hall sensors. The Hall sensors detect the position of the reflective member by sensing changes in magnetic field strength as the member rotates, eliminating the need for complex mechanical encoders or potentiometers and enabling precise position detection through non-contact magnetic field measurement.
Solution Approach 2:
The position sensing system utilizes changes in magnetic field parameters (field strength and direction) as the reflective member rotates. By monitoring these magnetic parameter variations, the system accurately determines the angular position of the reflective member without requiring direct mechanical contact or complex optical sensing.
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
The solution enables accurate position sensing and rotation of the reflective module, effectively correcting shaking and maintaining performance features without increasing the device's thickness, thus addressing the miniaturization challenge.
Implementation Method 1
a first driver including one first magnet mounted on the holder, a first coil opposing the one first magnet, and a first position sensor, and a second driver including one second magnet mounted on the holder, a second coil opposing the one second magnet, and a second position sensor
Implementation Method 2
the first position sensor may include one or more hall sensors, and the second position sensor may include a plurality of hall sensors
Data Source
AI summary
A reflective module includes a reflective member configured to change a path of light, a holder on which a reflective member is mounted, a housing accommodating the holder, a first driver including one first magnet mounted on the holder, a first coil opposing the one first magnet, and a first position sensor, and a second driver including one second magnet mounted on the holder, a second coil opposing the one second magnet, and a second position sensor, wherein one sidewall of the holder and the other sidewall of the holder have different shapes.