Camera Module Lens Height Adjustment via Adhesive on Flexible Board
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Solution Overview
Problem
There is a lack of techniques for accurately adjusting the height of an image surface-side lens mounted on a board relative to a sensor in camera modules, particularly in compact designs where warpage suppression is crucial.
Innovation Solution
A camera module design that includes a sensor mounted on a flexible printed board with an image surface-side lens positioned on the sensor, using an organic substance member, such as a resist or adhesive, to adjust the height and suppress warpage, ensuring precise mounting and reduced component size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the image surface-side lens is arranged immediately above the sensor to reduce height, then the camera module height is reduced, but it becomes difficult to accurately adjust the height from the board to the lens
Solution Approach 1:
The patent introduces an organic substance member (adhesive or resist) as an intermediary between the board and the image surface-side lens. This intermediary layer enables precise height adjustment of the lens relative to the sensor while maintaining the compact structure. The organic substance member acts as a mediator that provides the necessary spacing and positioning accuracy without requiring additional mechanical adjustment mechanisms.
2Stability of the object's composition
If the fixed portion on which the camera module is mounted is warped, then the sensor is warped accordingly and the image surface is curved, but suppressing warpage requires additional techniques that may increase complexity
Solution Approach 1:
The patent utilizes parameter changes in the organic substance member, specifically its thickness and material properties, to suppress warpage of the fixed portion. By carefully selecting and controlling the parameters of the organic substance member (such as its elastic modulus, thickness, and area), the patent achieves warpage suppression without requiring complex additional structures. The organic substance member's parameters are optimized to counteract the warping forces while maintaining a simple overall design.
Data Source
AI summary
An image surface-side group lens (18) is mounted on a flexible printed board (FPC) (2) by appropriately adjusting a height from the FPC (2) to the image surface-side group lens (18). A camera module (1) includes a sensor mounted on the FPC (2) and the image surface-side group lens (18) arranged on the sensor (14), in which the image surface-side group lens (18) is mounted on the FPC (2) with an adhesive (22) being interposed between the FPC (2) and an edge portion of the image surface-side group lens (18) on a side opposing the sensor (14).