Patent ID: 7048501

Claim:
A dust collecting filter, comprising: a layered filter medium unitarily formed by an upstream non-woven fabric configured to remove 70 to 90% of 0.3 μm particles and a downstream non-woven fabric configured to remove 99.9% of 0.3 μm particles or more, wherein a shape of the layered filter medium is a minipleat shape in a thickness direction, an entire shape of the layered filter medium in the thickness direction is a plurality of continuous V shapes, the upstream non-woven fabric is a filter medium having a thickness from 0.1 mm to 0.3 mm formed by fibers having a diameter from 0.3 μm to 15 μm, and the downstream non-woven fabric is a filter medium having a thickness from 0.1 mm to 0.3 mm formed by fibers having a diameter from 0.1 μm to 2 μm.