An image reading device includes a first unit to read one surface of a document in a first area facing a document path, a second unit disposed in the first area to read the other surface of the document, a first reference member facing the first unit at a first distance therefrom at a second position in a second area not facing the path, a second reference member facing the first unit at a second distance therefrom at a first position in the first area, a third reference member facing the second unit at the second distance therefrom, and a correction unit to correct, based on a difference between first data generated through reading of the first member by the first unit and second data generated through reading of the second member by the first unit, third data generated through reading of the third member by the second unit.

An electrostatic energy-harvesting device is provided. The electrostatic energy-harvesting device with a 3-dimensional cone shape includes a first structure including a first substrate having a cone shape with an opened lower surface and a hollow inside, and a first rubbing electrified body disposed on an outer surface of the first substrate; a second structure including a second substrate having the same shape as the first substrate and a second rubbing electrified body which includes a material having opposite electrification characteristics to the first rubbing electrified body and disposed on an inner surface of the second substrate; and leader lines connected to each of the first rubbing electrified body and the second rubbing electrified body.

An electrostatic energy-harvesting device is provided. The electrostatic energy-harvesting device with a 3-dimensional cone shape includes a first structure including a first substrate having a cone shape with an opened lower surface and a hollow inside, and a first rubbing electrified body disposed on an outer surface of the first substrate; a second structure including a second substrate having the same shape as the first substrate and a second rubbing electrified body which includes a material having opposite electrification characteristics to the first rubbing electrified body and disposed on an inner surface of the second substrate; and leader lines connected to each of the first rubbing electrified body and the second rubbing electrified body.

An electrostatic energy collector and an electrostatic energy collecting method. The electrostatic energy collector comprises: a vibrating table (101), the vibrating table being fixedly connected to a first end of a first cross beam (102) and a first end of a second cross beam (103), the first cross beam being parallel to the second cross beam, a vertical projection of the first cross beam being overlapped with that of the second cross beam, both of the first cross beam and the second cross beam being conductors, a first mass block (104) being fixedly arranged on the first cross beam, an electret layer (106) being coated at the side, close to the first cross beam, of the second cross beam, a second mass block (105) being fixed at the sided, facing away from the first cross beam, of the second cross beam, a first lead (107) being connected to the first cross beam and a first end of a load (109), and a second lead (108) being connected to the cross beam and a second end of the load. The electrostatic energy collector and the electrostatic energy collecting method can improve energy connection efficiency.

An image reading device includes a first unit to read one surface of a document in a first area facing a document path, a second unit disposed in the first area to read the other surface of the document, a first reference member facing the first unit at a first distance therefrom at a second position in a second area not facing the path, a second reference member facing the first unit at a second distance therefrom at a first position in the first area, a third reference member facing the second unit at the second distance therefrom, and a correction unit to correct, based on a difference between first data generated through reading of the first member by the first unit and second data generated through reading of the second member by the first unit, third data generated through reading of the third member by the second unit.