Importance

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Abstract

A focal length compensation structure for a lens assembly is used in a portable electronic product having an image taking lens assembly. The lens assembly comprises mounting seat, lens tube and expandable and shrinkable member, the expandable and shrinkable member is disposed between the portable electronic product and the mounting seat, between the mounting seat and the annular connecting portion of the lens tube, and/or between lenses of the lens array. The focal length of the lens array of the lens assembly will change with the outside temperature changes, plus the expansion of the mounting seat and the lens tube, the actual variation of the focal length of the lens assembly. Expansion and shrinkage can be calculated precisely to compensate the distance between the focus of the imaging focal length of the lens array and the image plane, enabling the imaging focal length to be dropped on the image plane precisely, thus forming a clear image.

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First Claim