STATIC ELIMINATION DEVICE AND MEDIUM PROCESSING DEVICE USING THE SAME
A static elimination device includes: a discharge electrode that is arranged in a non-contact state with respect to a medium and eliminates static from the medium; and a power source that applies a discharge voltage including at least an alternating-current component to the discharge electrode, in which f/v ≥0.8 (expression 1) is satisfied, where the transport speed of the medium is v (mm/sec.) and the frequency of the discharge electrode is f (Hz).
1 . A static elimination device comprising:
a discharge electrode that is arranged in a non-contact state with respect to a medium and eliminates static from the medium; and
a power source that applies a discharge voltage including at least an alternating-current component to the discharge electrode,
wherein
f/v≥ 0.8 (expression 1)
is satisfied, where a transport speed of the medium is v (mm/sec.) and a frequency of the discharge electrode is f (Hz).
2 . The static elimination device according to claim 1 ,
wherein
f/v≥ 1.5 (expression 2)
is satisfied.
3 . The static elimination device according to claim 1 ,
wherein the discharge electrode is covered by a housing having an opening in a region opposing the medium, and
f\v*L≥ 30 (expression 3)
is satisfied, where an opening width, in a transport direction of the medium, of the opening in the housing is L (mm).
4 . The static elimination device according to claim 2 ,
wherein the discharge electrode is covered by a housing having an opening in a region opposing the medium, and
f\v*L≥ 30 (expression 3)
is satisfied, where an opening width, in a transport direction of the medium, of the opening in the housing is L (mm).
5 . The static elimination device according to claim 1 ,
wherein a region between the discharge electrode and the medium is shielded by a shielding member having a through-hole that exposes all or some of the discharge electrode.
6 . The static elimination device according to claim 2 ,
wherein a region between the discharge electrode and the medium is shielded by a shielding member having a through-hole that exposes all or some of the discharge electrode.
7 . The static elimination device according to claim 3 ,
wherein a region between the discharge electrode and the medium is shielded by a shielding member having a through-hole that exposes all or some of the discharge electrode.
8 . The static elimination device according to claim 4 ,
wherein a region between the discharge electrode and the medium is shielded by a shielding member having a through-hole that exposes all or some of the discharge electrode.
9 . The static elimination device according to claim 5 ,
wherein the discharge electrode has one or a plurality of linear electrodes that extend in an intersecting direction that intersects a transport direction of the medium, and
a region between the one or plurality of linear electrodes and the medium is shielded by the shielding member, the shielding member having a through-hole that exposes at least any of the one or plurality of linear electrodes in an arbitrary region in a longitudinal direction.
10 . The static elimination device according to claim 6 ,
wherein the discharge electrode has one or a plurality of linear electrodes that extend in an intersecting direction that intersects a transport direction of the medium, and
a region between the one or plurality of linear electrodes and the medium is shielded by the shielding member, the shielding member having a through-hole that exposes at least any of the one or plurality of linear electrodes in an arbitrary region in a longitudinal direction.
11 . The static elimination device according to claim 7 ,
wherein the discharge electrode has one or a plurality of linear electrodes that extend in an intersecting direction that intersects the transport direction of the medium, and
a region between the one or plurality of linear electrodes and the medium is shielded by the shielding member, the shielding member having a through-hole that exposes at least any of the one or plurality of linear electrodes in an arbitrary region in a longitudinal direction.
12 . The static elimination device according to claim 8 ,
wherein the discharge electrode has one or a plurality of linear electrodes that extend in an intersecting direction that intersects the transport direction of the medium, and
a region between the one or plurality of linear electrodes and the medium is shielded by the shielding member, the shielding member having a through-hole that exposes at least any of the one or plurality of linear electrodes in an arbitrary region in a longitudinal direction.
13 . The static elimination device according to claim 5 ,
wherein the discharge electrode has a plurality of linear electrodes that extend in an intersecting direction that intersects a transport direction of the medium, and
the through-hole intersects the plurality of linear electrodes in an oblique direction, and is arranged in plurality at predetermined intervals in a length direction of the linear electrodes.
14 . The static elimination device according to claim 6 ,
wherein the discharge electrode has a plurality of linear electrodes that extend in an intersecting direction that intersects a transport direction of the medium, and
the through-hole intersects the plurality of linear electrodes in an oblique direction, and is arranged in plurality at predetermined intervals in a length direction of the linear electrodes.
15 . The static elimination device according to claim 7 ,
wherein the discharge electrode has a plurality of linear electrodes that extend in an intersecting direction that intersects the transport direction of the medium, and
the through-hole intersects the plurality of linear electrodes in an oblique direction, and is arranged in plurality at predetermined intervals in a length direction of the linear electrodes.
16 . The static elimination device according to claim 8 ,
wherein the discharge electrode has a plurality of linear electrodes that extend in an intersecting direction that intersects the transport direction of the medium, and
the through-hole intersects the plurality of linear electrodes in an oblique direction, and is arranged in plurality at predetermined intervals in a length direction of the linear electrodes.
17 . The static elimination device according to claim 5 ,
wherein the shielding member is configured of an insulating material.
18 . The static elimination device according to claim 1 ,
comprising a controller that controls a frequency of the discharge voltage in accordance with the transport speed of the medium.
19 . A static elimination device comprising:
a non-contact-type static eliminator including a discharge electrode that is arranged in a non-contact state with respect to a medium and eliminates static from the medium, and a power source that applies a discharge voltage including at least an alternating-current component to the discharge electrode, in which
f/v≥ 0.8 (expression 1)
is satisfied, where a transport speed of the medium is v (mm/sec.) and a frequency of the discharge electrode is f (Hz); and
a contact-type static eliminator that is provided further upstream in a transport direction of the medium than the non-contact-type static eliminator, has a static elimination member making contact with the medium, which is transported, and eliminates static from the medium by applying a voltage to the static elimination member.
20 . A medium processing device comprising:
a transporter that transports a medium;
a charger that is provided midway along a transport path of the medium and charges the medium; and
the static elimination device according to claim 1 , which is provided further downstream in a transport direction of the medium than the charger, and eliminates static from the medium charged by the charger.