Folded-Optics Camera Module With Prism Tilt Shake Compensation
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Solution Overview
Problem
Existing camera modules face challenges in achieving high zoom magnification due to limited shake compensation performance from asymmetrically arranged shake compensation driving units, which deteriorate image stabilization, especially in high zoom scenarios.
Innovation Solution
A camera module design incorporating a reflective member with a shake compensation actuator that includes magnets and coils arranged perpendicular to the optical axis, allowing the reflective member to tilt, and an extension member made of transparent material to accommodate light passage, enabling precise control of the prism's tilt.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the total track length is increased to provide high zoom magnification, then zoom capability is improved, but the device length increases
Solution Approach 1:
The patent introduces a reflective member (prism) that folds the optical path at approximately 90 degrees, allowing light to travel a longer distance within a shorter physical envelope. This dimensional change in the light path enables high zoom magnification without proportionally increasing the camera module's length
2Reliability
If magnets are symmetrically arranged at both ends of the prism for uniaxial tilt, then one axis of shake compensation is improved, but the other uniaxial tilt cannot be arranged symmetrically, deteriorating shake compensation performance
Solution Approach 1:
The patent deliberately employs asymmetric arrangement of magnets and coils to achieve bidirectional tilt control of the reflective member. Rather than forcing symmetric arrangement which would limit control to one axis, the asymmetric configuration enables independent control of two orthogonal tilt axes, improving overall shake compensation performance
Solution Approach 2:
The patent extends shake compensation from uniaxial to biaxial control by adding magnets and coils arranged in perpendicular directions. This dimensional extension allows the reflective member to be tilted in two orthogonal axes, comprehensively compensating for device shake in multiple directions
3Adaptability or versatility
If the distance from the prism to the image sensor is increased for high zoom magnification, then zoom capability is improved, but the degree of image fluctuation increases due to prism tilt
Solution Approach 1:
The patent implements a feedback control mechanism where sensors detect the degree of device shake and the control unit adjusts the position of the reflective member accordingly. This feedback loop compensates for image fluctuation caused by prism tilt, maintaining image position stability even with increased zoom magnification
4Reliability
If a shake compensation driving unit is disposed on the light path to tilt the prism, then shake compensation is improved, but the arrangement position is limited and cannot be symmetrically arranged
Solution Approach 1:
The patent extracts the shake compensation driving unit (magnets and coils) from the direct light path and positions them in the extension member. This separation allows the driving unit to be arranged without interfering with light transmission, while still effectively controlling the reflective member's tilt through electromagnetic interaction
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 design maintains compactness while enhancing shake compensation performance, ensuring accurate image stabilization even at high zoom magnifications without increasing the device's thickness.
Implementation Method 1
a shake compensation actuator disposed in the extension member and configured to tilt the reflective member with respect to an axis perpendicular to an optical axis of the first lens module. The shake compensation actuator may include: magnets disposed on a surface of the extension member parallel to the optical axis; and coils facing the magnets.
Implementation Method 2
a reflective member configured to change a path of light toward the first lens module
Data Source
AI summary
A camera module includes: a first lens module disposed in a housing and including at least one lens; a reflective member configured to change a path of light toward the first lens module; an extension member configured to be moved together with the reflective member, and disposed between the reflective member and the first lens module; and a shake compensation actuator disposed in the extension member and configured to tilt the reflective member with respect to an axis perpendicular to an optical axis of the first lens module.