Filter sheet and filter

A filter sheet comprising a first to-be-cut-out portion which is defined by a first perforated line, and which is usable as a filter by being cut out by breaking the first perforated line,

• wherein the first to-be-cut-out portion comprises:
• a first filter body;
• and
• one or more first ears integrally connected to an outer edge of the first filter body,
• wherein the filter, which is formed by cutting out the first to-be-cut-out portion from the filter sheet, is attachable to a bonding object that has a front surface and a side surface, and through which air can pass, by bringing the first filter body into abutment with the front surface of the bonding object, and bending the one or more first ears relative to the first filter body until the one or more first ears abut against the side surface of the bonding object,
• wherein the first filter body has a substantially circular shape,
• wherein the one or more first ears comprises a plurality of first ears that are disposed at equal intervals in a circumferential direction of the first filter body,
• wherein each first ear of the plurality of first ears includes, at a boundary between the first filter body and the first ear, a repulsion reducing portion for reducing elastic repulsion of a material of the filter when the first ear is bent relative to the first filter body, and
• wherein the repulsion reducing portion of each first ear of the plurality of first ears comprises cuts formed at the boundary between the first filter body and the first ear, or perforated portions which can become cuts by being broken when the filter is used.

A filter sheet comprising a first to-be-cut-out portion which is defined by a first perforated line, and which is usable as a filter by being cut out by breaking the first perforated line,

• wherein the first to-be-cut-out portion comprises:
• a first filter body;
• and
• one or more first ears integrally connected to an outer edge of the first filter body,
• wherein the filter, which is formed by cutting out the first to-be-cut-out portion from the filter sheet, is attachable to a bonding object that has a front surface and a side surface, and through which air can pass, by bringing the first filter body into abutment with the front surface of the bonding object, and bending the one or more first ears relative to the first filter body until the one or more first ears abut against the side surface of the bonding object,
• wherein the first filter body has a rectangular shape having long sides extending in a lateral direction,
• wherein the one or more first ears comprises a plurality of first ears that are disposed along the long sides of the first filter body,
• wherein each first ear of the plurality of first ears includes, at a boundary between the first filter body and the first ear, a repulsion reducing portion for reducing elastic repulsion of a material of the filter when the first ear is bent relative to the first filter body, and
• wherein the repulsion reducing portion of each first ear of the plurality of first ears comprises cuts formed at the boundary between the first filter body and the first ear, or perforated portions which can become cuts by being broken when the filter is used.

A filter sheet comprising a first to-be-cut-out portion which is defined by a first perforated line, and which is usable as a filter by being cut out by breaking the first perforated line,

• wherein the first to-be-cut-out portion comprises:
• a first filter body;
• and
• one or more first ears integrally connected to an outer edge of the first filter body,
• wherein the filter, which is formed by cutting out the first to-be-cut-out portion from the filter sheet, is attachable to a bonding object that has a front surface and a side surface, and through which air can pass, by bringing the first filter body into abutment with the front surface of the bonding object, and bending the one or more first ears relative to the first filter body until the one or more first ears abut against the side surface of the bonding object,
• wherein the filter sheet further comprises, inside the first filter body, a second to-be-cut-out portion comprising:
• a second filter body defined by a second perforated line, the second filter body being smaller than the first filter body;
• and
• one or more second ears integrally connected to an outer edge of the second filter body, the one or more second ears being smaller than the one or more first ears,
• wherein the second to-be-cut-out portion is usable as a small filter by being cut out by breaking the second perforated line, and
• wherein a position of each second ear of the one or more second ears where the second ear is integrally connected to the second filter body is displaced, in a circumferential direction of the filter sheet, from a position of each first ear of the one or more first ears where the first ear is integrally connected to the first filter body.

A filter sheet comprising a first to-be-cut-out portion which is defined by a first perforated line, and which is usable as a filter by being cut out by breaking the first perforated line,

• wherein the first to-be-cut-out portion comprises:
• a first filter body;
• and
• one or more first ears integrally connected to an outer edge of the first filter body,
• wherein the filter, which is formed by cutting out the first to-be-cut-out portion from the filter sheet, is attachable to a bonding object that has a front surface and a side surface, and through which air can pass, by bringing the first filter body into abutment with the front surface of the bonding object, and bending the one or more first ears relative to the first filter body until the one or more first ears abut against the side surface of the bonding object,
• wherein the first filter body has a substantially circular shape,
• wherein the one or more first ears comprises a plurality of first ears that are disposed at equal intervals in a circumferential direction of the first filter body,
• wherein the filter sheet further comprises, inside the first filter body, a second to-be-cut-out portion comprising:
• a second filter body defined by a second perforated line, the second filter body being smaller than the first filter body;
• and
• one or more second ears integrally connected to an outer edge of the second filter body, the one or more second ears being smaller than the plurality of first ears,
• wherein the second to-be-cut-out portion is usable as a small filter by being cut out by breaking the second perforated line, and
• wherein positions of the second ears where the second ears are integrally connected to the second filter body are displaced, in a circumferential direction of the filter sheet, from positions of the first ears where the first ears are integrally connected to the first filter body.

A filter sheet comprising a first to-be-cut-out portion which is defined by a first perforated line, and which is usable as a filter by being cut out by breaking the first perforated line,

• wherein the first to-be-cut-out portion comprises:
• a first filter body;
• and
• one or more first ears integrally connected to an outer edge of the first filter body,
• wherein the filter, which is formed by cutting out the first to-be-cut-out portion from the filter sheet, is attachable to a bonding object that has a front surface and a side surface, and through which air can pass, by bringing the first filter body into abutment with the front surface of the bonding object, and bending the one or more first ears relative to the first filter body until the one or more first ears abut against the side surface of the bonding object,
• wherein the first filter body has a rectangular shape having long sides extending in a lateral direction,
• wherein the one or more first ears comprises a plurality of first ears that are disposed along the long sides of the first filter body,
• wherein the filter sheet further comprises, inside the first filter body, a second to-be-cut-out portion comprising:
• a second filter body defined by a second perforated line, the second filter body being smaller than the first filter body;
• and
• one or more second ears integrally connected to an outer edge of the second filter body, the one or more second ears being smaller than the plurality of first ears,
• wherein the second to-be-cut-out portion is usable as a small filter by being cut out by breaking the second perforated line, and
• wherein positions of the second ears where the second ears are integrally connected to the second filter body are displaced, in a circumferential direction of the filter sheet, from positions of the first ears where the first ears are integrally connected to the first filter body.

A filter comprising:

• a filter body;
• and
• one or more ears integrally connected to an outer edge of the filter body,
• wherein the filter is attachable to a bonding object that has a front surface and a side surface, and through which air can pass, by bringing the filer body into abutment with the front surface of the bonding object, and bending the one or more ears relative to the filter body until the one or more ears abut against the side surface of the bonding object,
• wherein each ear of the one or more ears includes, at a boundary between the filter body and the ear, a repulsion reducing portion for reducing elastic repulsion of a material of the filter when the ear is bent relative to the filter body, and
• wherein the repulsion reducing portion of each ear of the one or more ears comprises cuts formed at the boundary between the filter body and the ear, or perforated portions which can become cuts by being broken when the filter is used.