US 12,454,135 B2
Filter unit, liquid ejecting head, and liquid ejecting apparatus
Shigeki Suzuki, Matsumoto (JP)
Assigned to Seiko Epson Corporation, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Jan. 24, 2023, as Appl. No. 18/158,738.
Claims priority of application No. 2022-009283 (JP), filed on Jan. 25, 2022.
Prior Publication US 2023/0234369 A1, Jul. 27, 2023
Int. Cl. B41J 2/175 (2006.01); B41J 2/14 (2006.01); B41J 2/19 (2006.01)
CPC B41J 2/17563 (2013.01) [B41J 2/175 (2013.01); B41J 2/19 (2013.01); B41J 2002/14403 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A filter unit comprising:
a filter through which a liquid passes;
a filter chamber that is divided into an upstream chamber and a downstream chamber by the filter;
an inflow passage through which a liquid flows into the upstream chamber;
a first outflow passage through which a liquid flows out from the downstream chamber;
a second outflow passage through which a liquid flows out from the downstream chamber; and
a third outflow passage through which a liquid flows out from the downstream chamber, wherein
a distance from the inflow passage to the first outflow passage is shorter than a distance from the inflow passage to the second outflow passage,
a passage resistance of the second outflow passage is lower than a passage resistance of the first outflow passage,
the distance from the inflow passage to the second outflow passage is shorter than a distance from the inflow passage to the third outflow passage, and
a passage resistance of the third outflow passage is lower than the passage resistance of the second outflow passage.