Image reading apparatus, default value adjusting method of image reading apparatus, and chart original
AssigneeFuji Photo Film Co., Ltd.
InventorYasunobu Sakaguchi
Life of this patent
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Abstract
A chart original in which two or more patterns are disposed so as to be separated at predetermined intervals and are symmetric with respect to a second imaginary line which is orthogonal to a first imaginary line. Each of the patterns is formed from a first line segment, which is orthogonal to the first imaginary line, and two second line segments, which are disposed at opposite positions with respect to the first line segment so as to intersect the first line segment. Each of the patterns intersect the first imaginary line at three points.
Claims11
An image reading apparatus comprising:
- a reading section movable in an optical axis direction, said reading section including a lens unit which is movable in the optical axis direction, and an image reading element which is disposed at a focusing position of the lens unit and which via the lens unit reads an image of an original disposed at an original reading position;
- first driving means for moving the lens unit in the optical axis direction in accordance with an inputted signal of a first pulse number;
- second driving means for moving said reading section in the optical axis direction in accordance with an inputted signal of a second pulse number;
- storing means for storing a first default value, which expresses an amount of movement corresponding to a unit pulse of said first moving means, and a second default value, which expresses an amount of movement corresponding to a unit pulse of said second moving means;
- and
- pulse number calculating means for calculating the first pulse number corresponding to a focusing magnification by using the first default value, inputting a signal of the first pulse number to said first driving means, calculating the second pulse number corresponding to the focusing magnification by using the second default value, and inputting a signal of the second pulse number to said second driving means.
A default value adjusting method of an image reading apparatus in which default values of the image reading apparatus are adjusted, the image reading apparatus comprising:
- a reading section movable in an optical axis direction, said reading section including a lens unit which is movable in the optical axis direction, and an image reading element which is disposed at a focusing position of the lens unit and which via the lens unit reads an image of an original disposed at an original reading position;
- first driving means for moving the lens unit in the optical axis direction in accordance with an inputted signal of a first pulse number;
- second driving means for moving said reading section in the optical axis direction in accordance with an inputted signal of a second pulse number;
- storing means for storing a first default value, which expresses an amount of movement corresponding to a unit pulse of said first moving means, and a second default value, which expresses an amount of movement corresponding to a unit pulse of said second moving means;
- and
- pulse number calculating means for calculating the first pulse number corresponding to a focusing magnification by using the first default value, inputting a signal of the first pulse number to said first driving means, calculating the second pulse number corresponding to the focusing magnification by using the second default value, and inputting a signal of the second pulse number to said second driving means,
- and the default value adjusting method comprising steps of:
- making said pulse number calculating means calculate the first pulse number and the second pulse number which correspond to a predetermined set focusing magnification;
- making said pulse number calculating means input the signal of the first pulse number to said first driving means and input the signal of the second pulse number to said second driving means so that the lens unit and said reading section are moved;
- carrying out autofocusing, in which said second driving means is driven so as to carry out focusing with respect to the original, and carrying out magnification adjustment, in which said first driving means is driven such that an actual focusing magnification after autofocusing is carried out coincides with the set focusing magnification, until the actual focusing magnification becomes a value within a standard range with respect to the set focusing magnification;
- and
- adjusting the second default value on the basis of the second pulse number for when the actual focusing magnification becomes the value within the standard range with respect to the set focusing magnification and on the basis of a conjugate length for the set focusing magnification, and adjusting the first default value on the basis of the first pulse number for when the actual focusing magnification becomes the value within the standard range with respect to the set focusing magnification and on the basis of a distance from a principal point of the lens unit to the focusing position with respect to the set focusing magnification.
A chart original in which two or more patterns are disposed so as to be separated at predetermined intervals and so as to be symmetric with respect to a second imaginary line which is orthogonal to a first imaginary line, each of said patterns being formed from a first line segment, which is orthogonal to the first imaginary line, and two second line segments, which are disposed at opposite positions with respect to the first line segment so as to intersect the first line segment, and each of said patterns intersecting the first imaginary line at the three points.
Dependencies are inferred from the claim text.