초록 ▼

An object is to provide a vent filter in which a vent film is less likely to be broken when cut and a measure to shrinkage is taken while the characteristics and functions both inherent to the vent film are being kept. The vent filter includes a frame-shaped adhesive layer 2 and a vent film 3 attach

An object is to provide a vent filter in which a vent film is less likely to be broken when cut and a measure to shrinkage is taken while the characteristics and functions both inherent to the vent film are being kept. The vent filter includes a frame-shaped adhesive layer 2 and a vent film 3 attached to the adhesive layer 2, wherein an outer peripheral portion of the vent film 3 is positioned at an outer side than an outer peripheral portion of the frame-shaped adhesive layer 2.

대표청구항 ▼

1. A vent filter comprising an adhesive layer formed into a frame shape with an opening, and a vent film attached to the frame-shaped adhesive layer over the opening, wherein an outer peripheral portion of the vent film is positioned at an outer side than an outer peripheral portion of the frame-sha

1. A vent filter comprising an adhesive layer formed into a frame shape with an opening, and a vent film attached to the frame-shaped adhesive layer over the opening, wherein an outer peripheral portion of the vent film is positioned at an outer side than an outer peripheral portion of the frame-shaped adhesive layer. 2. The vent filter according to claim 1, wherein the outer peripheral portion of the vent film is folded back so that a valley is formed on the side of the adhesive layer. 3. The vent filter according to claim 1, wherein the vent film is composed of a fluororesin film. 4. The vent filter according to claim 3, wherein the vent film is composed of a porous polytetrafluoroethylene film. 5. The vent filter according to claim 1, wherein a liquid-repellent agent is added to a surface of the vent film. 6. The vent filter according to claim 1, wherein the adhesive layer is a double-sided pressure-sensitive adhesive tape. 7. A method for manufacturing a vent filter, which comprises: forming an adhesive layer into a frame shape with an opening on a release sheet; covering the frame-shaped adhesive layer and opening with a vent film; and cutting the vent film at an outer side than an outer peripheral portion of the frame-shaped adhesive layer. 8. A method for manufacturing a vent filter, which comprises: forming an adhesive layer into a frame shape with an opening on a release sheet; and covering the frame-shaped adhesive layer and opening with a fluororesin film formed into a larger size than that of the frame-shaped adhesive layer. 9. The vent filter according to claim 1, wherein the outer peripheral portion of the vent film is defined without cutting the outer peripheral portion of the frame-shaped adhesive layer. 10. The vent filter according to claim 1, wherein a distance between the outer peripheral portion of the vent filter and the outer peripheral portion of the frame-shaped adhesive layer is at least 0.1 mm. 11. The vent filter according to claim 1, wherein a distance between the outer peripheral portion of the vent filter and the outer peripheral portion of the frame-shaped adhesive layer is between 0.5 mm and 2.0 mm. 12. The vent filter according to claim 1, wherein the outer peripheral portion of the vent filter reduces potential exposure of the frame-shaped adhesive layer during use and reduces potential damage to the vent film during manufacturing of the vent filter. 13. The vent filter according to claim 4, wherein surfaces inside pores of the vent film are coated with a liquid-repellent agent. 14. The vent filter according to claim 6, further including a removable release sheet attached to the adhesive layer. 15. The vent filter according to claim 14, wherein the removable release sheet is composed of polyethylene terephthalete. 16. The vent filter according to claim 14, wherein the outer peripheral portion of the vent film is defined without cutting the release sheet. 17. The vent filter according to claim 14, wherein the outer peripheral portion of the vent film is defined by cutting together with the release sheet. 18. The vent filter according to claim 14, wherein to use the vent filter the removable release sheet is peeled from the frame-shaped adhesive layer and the frame-shaped adhesive layer is attached to a housing so that the vent film of the vent filter covers an opening provided in the housing. 19. A method for manufacturing a vent filter according to claim 7, wherein the adhesive layer is a double-sided pressure-sensitive adhesive tape, and further comprising: cutting the release sheet together with said cutting of the vent filter. 20. A method for manufacturing a vent filter according to claim 7, further comprising: folding the outer peripheral portion of the vent film so that a valley is formed on the side of the adhesive layer.