Reflector Rotation for Optical Image Stabilization
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Solution Overview
Problem
The challenge in mobile phone camera modules is to maintain image quality during telephoto photography, where image jitter caused by hand-shaking severely degrades imaging quality, especially in dark scenes and with longer exposure times.
Innovation Solution
An optical image stabilization apparatus is introduced, comprising a first lens, a first reflector, a position sensor, and a control component. The position sensor detects shaking information of the first lens and sends it to the control component, which controls the first reflector to rotate based on the shaking information, thereby compensating for the deflection of the optical path caused by lens shaking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a longer exposure time is used for dark-scene photographing, then the imaging quality can be improved, but image jitter occurs which severely degrades imaging quality
Solution Approach 1:
The position sensor detects lens shaking in advance during the exposure period, and the control component activates the reflector rotation mechanism to compensate for the detected shaking before it affects the imaging quality, thereby maintaining stable imaging during long exposure dark-scene photographing
Solution Approach 2:
The position sensor continuously monitors the lens shaking state and provides real-time feedback to the control component, which adjusts the reflector rotation accordingly to counteract the shaking, creating a closed-loop feedback system that maintains imaging stability during long exposure
2Adaptability or versatility
If telephoto photographing is performed, then the photographing capability is enhanced, but shaking sensitivity increases which degrades image quality
Solution Approach 1:
The reflector acts as an intermediary element between the lens and the image sensor, rotating to compensate for lens shaking and thereby isolating the imaging process from the harmful effects of hand-shaking during telephoto photographing
3Reliability
If image stabilization is implemented using traditional methods, then image jitter is reduced, but the device complexity increases
Solution Approach 1:
The reflector serves multiple functions: it directs light to the image sensor for normal operation and simultaneously acts as a stabilization element by rotating to compensate for lens shaking, thereby achieving image stabilization without adding separate dedicated components
Solution Approach 2:
The existing reflector in the optical path is utilized for image stabilization purposes, making the existing component serve an additional function and avoiding the need for separate stabilization mechanisms
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 solution effectively reduces the amplitude of vibration of the light spot on the imaging plane, maintaining the stability of the light spot and achieving an image stabilization effect, thereby enhancing the imaging quality during telephoto photography.
Implementation Method 1
after being reflected by the first reflector, the optical signal is projected onto an imaging plane
Data Source
AI summary
An optical image stabilization apparatus includes a first lens, a first reflector, a position sensor, a control component, and a housing configured to enclose the first lens and the first reflector, where the position sensor is connected to the control component. An optical signal is transmitted to the first reflector after passing through the first lens. The first reflector reflects the received optical signal, and the reflected optical signal is projected onto an imaging plane. The position sensor is configured to detect shaking information of the first lens and send the shaking information to the control component. The control component is configured to control, based on the shaking information, the first reflector to rotate by using a first preset direction as an axis, where the first preset direction is a direction that is not parallel to a normal direction of the first reflector.