Library device, accessor, and method of positioning for library device

1. A library device comprising:

a magazine which provides with a plurality of cells, wherein each of a cell of the plurality of cells stores a recording medium; and

an accessor which is positioned at a position facing a target cell of the plurality of cells in said magazine to pick up said recording medium from said target cell or store said recording medium in said target cell, wherein

said accessor includes a first position correction unit and a second position correction unit which positions said accessor at the position facing said target cell and when the first position correction unit fails to position said accessor at the position facing said target cell, the second position correction unit will position said accessor at the position facing said target cell.

2. The library device according to claim 1 , wherein

said first position correction unit performs correction with high accuracy compared to said second position correction unit.

3. The library device according to claim 1 , wherein

said second position correction unit has a wide correction range compared to said first position correction unit.

4. The library device according to claim 1 wherein said first position correction unit performs a positioning of said accessor by moving said accessor by a predetermined amount in a direction of movement of said accessor from a vicinity of the position facing said cell and when the positioning fails, the direction of movement of said accessor or the amount of movement from the vicinity of the position facing said cell is changed and the positioning of said accessor is performed again.

5. The library device according to claim 1 wherein said second position correction unit performs the positioning of said accessor based on a comparison between a result of measurement of a target mark put on said cell by a camera module mounted in said accessor and a design value of said target mark.

6. The library device according to claim 5 wherein

said target mark is put on a latch lever of said cell.

7. An accessor comprising:

a first position correction unit; and

a second position correction unit for positioning the accessor to a position facing a cell of a library device, wherein

when said first position correction unit fails to position said accessor at the position facing said target cell, said second position correction unit will position said accessor at the position facing said target cell.

8. A method of positioning for a library device which includes

a magazine which provide with a plurality of cells, wherein each of a cell of the plurality of cells stores a recording medium and an accessor which is positioned to a position facing a target cell in said magazine to pick up said recording medium from said target cell or store said recording medium in said target cell,

wherein said accessor includes a first position correction unit and a second position correction unit for positioning said accessor at the position facing said target cell, comprising:

positioning said accessor at the position facing said target cell by said second position correction unit when said first position correction unit means fail to position said accessor at the position facing said target cell.

9. A library device comprising:

a magazine which provides with a plurality of cells, wherein each of a cell of the plurality of cells stores a recording medium; and

an accessor which is positioned at a position facing a target cell in said magazine to pick up said recording medium from said target cell or store said recording medium in said target cell, wherein

said accessor includes a first position correction means and a second position correction means for positioning said accessor at the position facing said target cell and when the first position correction means fail to position said accessor at the position facing said target cell, the second position correction means position said accessor at the position facing said target cell.