Prism-Based Hand Shake Correction in Camera Devices
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Solution Overview
Problem
Existing camera devices with deflection optical systems face challenges in implementing a space-saving hand shake correction mechanism without increasing weight, particularly for zoom optical systems, as traditional methods require heavy motors for lens movement.
Innovation Solution
The camera device employs a prism positioned closer to the object side for image shake correction, rotating to address axis perpendicular to the optical axis, and uses an electromagnetic actuator to move the imaging lens sets as a whole, eliminating the need for a heavy motor by integrating a stepping motor that moves the zoom lenses parallel to the optical axis with a nut part and roller for reduced friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a motor is assembled into the hand shake correction operation structure to move the imaging lens sets as a whole, then the imaging lens sets can be moved for shake correction, but the weight of the device increases significantly
Solution Approach 1:
The patent extracts the motor from the hand shake correction operation structure. Instead of using a motor to move the imaging lens sets for shake correction, the invention uses the motor solely for zooming operations while employing an electromagnetic actuator for hand shake correction, thereby eliminating the need for a heavy motor in the correction mechanism.
Solution Approach 2:
The imaging lens sets serve multiple functions: they are used for both zooming operations (driven by the motor) and hand shake correction (driven by the electromagnetic actuator). This multi-functionality allows the system to achieve shake correction without requiring a dedicated heavy motor for the correction mechanism.
2Volume of moving object
If a deflection structure is used to enable a zoom optical system with long total optical length to be mounted on a portable electronic device, then the device size is reduced, but the structure becomes more complex
Solution Approach 1:
The patent combines the zoom optical system with a deflection structure (prism or mirror) into an integrated imaging lens set. The zoom lenses and the deflecting element are merged into a single movable unit that can be controlled by the electromagnetic actuator, reducing the need for separate deflection mechanisms while maintaining compact form factor.
3Reliability
If a prism is rotated about an axis parallel to the optical axis of the incident surface to correct shake, then shake correction is achieved, but the surrounding image rotates and anti-shake effect is reduced
Solution Approach 1:
The patent employs asymmetric rotation axes for the prism. Instead of rotating the prism about an axis parallel to the optical axis, the invention rotates the prism about an axis perpendicular to the optical axis, which corrects shake without causing image rotation. This asymmetric orientation of the rotation axis resolves the contradiction between shake correction effectiveness and image orientation stability.
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 configuration allows for effective hand shake correction without increasing the device's weight or size, maintaining image quality by moving the imaging lens sets including the zoom optical system as a whole, while avoiding the need for a large motor, thus providing a space-saving and lightweight anti-shake mechanism.
Implementation Method 1
A driving mechanism of the lens driving device suitable for a general portable electronic device is generally formed by a coil and a magnet, and the coil is fixed to an outer periphery of a carrier of the lens. When an electric current is applied to the coil, the coil moves the carrier of the lens and therefore move along a direction of an optical axis of the lens under an effect of an electromagnetic force
Implementation Method 2
the nut part abuts against an abutting portion of an imaging lens set frame that holds the imaging lens set through a roller part for reducing friction
Data Source
AI summary
The present invention provides a camera device with an anti-shake mechanism and a deflection optical system, which does not deteriorate image performance due to movement of the lens. An optical system includes, from an object side, a reflecting part configured to deflect an optical axis, imaging lens sets, and an imaging element. Image shake of an axis perpendicular to a plane formed by an optical axis of the imaging lens sets and a reflected optical axis of the object side by the reflecting part is corrected by rotation of the reflecting part. Image shake of an axis that is parallel to the reflected optical axis of the object side is corrected by moving the imaging lens sets including the zoom optical system as a whole along a direction perpendicular to the optical axis of the imaging lens sets.