Folded Optical Imaging Layout for Thin Telephoto Stabilization
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Solution Overview
Problem
The miniaturization of cameras in portable electronic devices is hindered by the thickness increase due to multiple lenses, especially telephoto cameras with long focal lengths, and the power consumption issue from moving lens modules with shake correction functions.
Innovation Solution
An optical imaging system with a reflective member, five lenses, and a shake detection unit, where the lenses are arranged to minimize thickness and power consumption, and the image sensor moves to correct shake, satisfying specific curvature and focal length ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If multiple lenses are disposed in the thickness direction to achieve telephoto function, then focal length is increased, but thickness of the portable electronic device increases
Solution Approach 1:
The patent introduces a reflective member (mirror) to fold the optical path, changing the light propagation from a straight line to a reflected path. This allows the optical system to achieve a longer effective focal length while maintaining a compact physical thickness by utilizing the third dimension (optical path folding) rather than simply extending the lens train in the thickness direction.
Solution Approach 2:
The patent arranges the five lenses and reflective member in a nested configuration where components are positioned within a compact space. The lenses are sequentially disposed along the optical axis with the reflective member positioned to reflect light back through the lens system, creating a folded optical path that nests multiple optical elements within a thin form factor.
2Reliability
If a lens module is moved to provide shake correction function, then image stabilization is achieved, but power consumption increases due to the weight of the lens module
Solution Approach 1:
Instead of moving the heavy lens module to correct shake (conventional approach), the patent inverts the approach by moving the lightweight image sensor in the opposite direction of the shake detection signal. This reversal significantly reduces the mass that needs to be actuated, thereby reducing power consumption while achieving the same image stabilization effect.
Solution Approach 2:
The patent replaces the mechanical lens module movement system with an electronic image sensor positioning system. By using a shake detection unit to sense device movement and electronically controlling the image sensor position accordingly, the system substitutes a high-power mechanical actuation system with a lower-power electronic positioning system.
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 system achieves a reduced thickness and long focal length while effectively correcting shake with minimal power consumption, suitable for portable devices.
Implementation Method 1
a reflective member having a reflective surface to change an optical path of light
Implementation Method 2
a first lens having positive refractive power
Implementation Method 3
a second lens having negative refractive power
Data Source
AI summary
An optical imaging system includes a reflective member having a reflective surface for changing an optical path of light, a first lens having positive refractive power, a second lens having negative refractive power, a third lens, a fourth lens, and a fifth lens. The first lens to the fifth lens are sequentially disposed along an optical axis from an object side and are each disposed closer to an image sensor than the reflective member. The optical imaging system satisfies 0.2 mm<C1.0<0.3 mm, where C1.0 is a distance by which the image sensor moves in a direction perpendicular to the optical axis with respect to a shake amount of 1.0° measured by a shake detection unit.