Backside Illuminated Image Pickup Unit Positioning
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Solution Overview
Problem
Conventional image pickup units face challenges in accurately positioning the image pickup optical system with respect to the light-receiving surface of image pickup devices, leading to potential defocusing and increased manufacturing complexity and costs.
Innovation Solution
An image pickup unit design featuring a frame body with a claw portion that abuts an opposing surface of the image pickup device, using this surface as a reference to define the position of the image pickup optical system, thereby improving positional accuracy and reducing assembly complexity and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the image pickup optical system is arranged with high positional accuracy using conventional methods (cover glass + lens frame), then the positional accuracy is improved, but the manufacturing complexity and costs increase
Solution Approach 1:
The patent extracts the positioning function from the complex conventional system (cover glass + lens frame) and concentrates it into a single integrated frame body with an abutting portion. This abutting portion directly abuts the opposing surface of the image pickup device to define the position of the image pickup optical system, eliminating the need for separate cover glass and lens frame components while maintaining high positional accuracy.
Solution Approach 2:
The frame body is designed to perform multiple functions simultaneously: it provides structural support, defines the position of the image pickup optical system through the abutting portion, and eliminates the need for separate protective cover glass. This multi-functionality reduces the number of components and simplifies the manufacturing process while maintaining positioning accuracy.
2Ease of manufacture
If the image pickup optical system is arranged displaced in the optical axis direction with respect to the light-receiving surface, then the manufacturing process becomes simpler, but the focal position becomes displaced causing defocusing
Solution Approach 1:
The frame body's abutting portion automatically defines the correct position of the image pickup optical system through direct contact with the opposing surface of the image pickup device. This self-aligning mechanism ensures that the optical system is positioned at the correct focal distance without requiring complex external positioning tools or procedures, thereby maintaining both manufacturing simplicity and focal position accuracy.
Data Source
AI summary
An image pickup unit according to the present invention includes: a lens frame that internally holds an image pickup optical system; and a backside illuminated image pickup device which has a light-receiving section that receives light entering the lens frame via the image pickup optical system and which is held inside the lens frame, wherein a claw portion of the lens frame abuts an opposing surface that opposes a light-entering surface of the image pickup device so as to define a position of the image pickup optical system in an optical axis direction L with respect to the light-receiving section using the opposing surface as a reference.