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METHOD FOR ADJUSTING POSITION OF IMAGE SENSOR, METHOD AND APPARATUS FOR MANUFACTURING A CAMERA MODULE, AND CAMERA MODULE

  • US 20090180021A1
  • Filed: 01/14/2009
  • Published: 07/16/2009
  • Est. Priority Date: 01/15/2008
  • Status: Abandoned Application
First Claim
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1. A method for adjusting position of an image sensor comprising:

  • (A) an in-focus coordinate value obtaining step including steps of;

    placing a taking lens and an image sensor for capturing a chart image formed by said taking lens on a Z axis orthogonal to a measurement chart;

    capturing said chart image while moving said taking lens or said image sensor sequentially to a plurality of discrete measurement positions previously established on said Z axis;

    calculating a focus evaluation value indicating a degree of focus at each said measurement positions in plural imaging positions based on image signals obtained in at least five said imaging positions on an imaging surface of said image sensor; and

    obtaining a Z axis coordinate of the measurement position providing a predetermined focus evaluation value as an in-focus coordinate value for each of said imaging positions;

    (B) an imaging plane calculating step including steps of;

    transforming at least five evaluation points in a three dimensional coordinate system composed of an XY coordinate plane orthogonal to said Z axis, each of said evaluation points being expressed by a combination of XY coordinate values of said imaging positions, obtained when said imaging surface overlaps with said XY coordinate plane, and said in-focus coordinate values on said Z axis of said imaging positions; and

    calculating an approximate imaging plane defined as a single plane in said three dimensional coordinate system based on the relative position of said evaluation points;

    (C) an adjustment value calculating step for calculating an imaging plane coordinate value representing an intersection point between said approximate imaging plane and said Z axis, and rotation angles of said approximate imaging plane around an X axis and an Y axis with respect to said XY coordinate plane; and

    (D) an adjusting step for adjusting position on said Z axis and tilt around said X and Y axes of said image sensor based on said imaging plane coordinate value and said rotation angles so that said imaging surface overlaps with said approximate imaging plane.

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