Autofocus Lens Drive Tilt Correction Without Extra Sensors
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Solution Overview
Problem
Conventional autofocus cameras require additional sensors and wires to correct optical axis tilt, which complicates the design and increases size, particularly in compact devices like mobile phones.
Innovation Solution
An autofocus camera system that uses an image sensor and a lens driving device with a control portion to adjust optical axis tilt based on electrical signals from the image sensor, without the need for additional sensors, by maximizing resolution signals at predetermined positions, including the center and peripheral areas of the image sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional sensors and wires are added to detect and correct optical axis tilt, then tilt correction capability is improved, but device complexity and size increase
Solution Approach 1:
The image sensor serves dual functions: capturing images and detecting optical axis tilt. By utilizing the existing image sensor's signal output capabilities, the system eliminates the need for separate tilt detection sensors and wires, thereby reducing structural complexity while maintaining tilt correction functionality
Solution Approach 2:
The image sensor is made multi-functional by using it both for image capture and for tilt detection. The control portion analyzes the image sensor's signal output to determine tilt direction and magnitude, allowing one component to perform multiple functions and avoiding additional hardware additions
2Reliability
If additional sensors and wires are added to detect and correct optical axis tilt, then tilt correction capability is improved, but device size increases
Solution Approach 1:
The image sensor serves dual functions: capturing images and detecting optical axis tilt. By utilizing the existing image sensor's signal output capabilities, the system eliminates the need for separate tilt detection sensors and wires, thereby reducing structural complexity while maintaining tilt correction functionality
Solution Approach 2:
The image sensor is made multi-functional by using it both for image capture and for tilt detection. The control portion analyzes the image sensor's signal output to determine tilt direction and magnitude, allowing one component to perform multiple functions and avoiding additional hardware additions
Data Source
AI summary
An autofocus camera is provided which restrains and corrects any tilt that may occur in the optical axis direction without the need of providing any additional new sensors for that purpose. The autofocus camera includes an image sensor for receiving light from an object and converting the light into corresponding electrical signals, a lens driving device having a lens for focusing the light from the object upon said image sensor, and a control portion for causing said lens driving device to adjust any tilt that may occur in the optical axis in response to the electrical signals received from said image sensor. The control portion is operated to cause the lens driving device to adjust any tilts of the optical axis with respect to the image sensor in the orthogonal directions with each other, so that the resolution signals at the predetermined positions of said image sensor can be maximized.