| US 7,494,210 B2 | ||
| Inkjet recording head having dynamic vibration absorber | ||
| Takahiro Yamada, Hitachinaka (Japan); Toshiharu Sumiya, Kawasaki (Japan); Tomohiko Koda, Hitachinaka (Japan); Shinya Kobayashi, Hitachinaka (Japan); and Satoru Tobita, Hitachinaka (Japan) | ||
| Assigned to Ricoh Printing Systems, Ltd., Tokyo (Japan) | ||
| Filed on Jul. 13, 2005, as Appl. No. 11/179,807. | ||
| Claims priority of application No. P2004-208070 (JP), filed on Jul. 15, 2004. | ||
| Prior Publication US 2006/0012647 A1, Jan. 19, 2006 | ||
| Int. Cl. B41J 2/045 (2006.01); B41J 2/17 (2006.01) | ||
| U.S. Cl. 347—71 [347/94] | 15 Claims |
| 1. An inkjet recording head comprising:
a housing member;
a base member;
an ink channel unit supported by the housing member and formed with a plurality of nozzle holes through which ink droplets
are ejected and formed with a plurality of ink pressure chambers in a one-to-one correspondence with the plurality of nozzle
holes, the ink channel unit including a diaphragm that defines part of each ink pressure chamber;
a plurality of piezoelectric elements aligned in an aligned in alignment direction and provided in a one-to-one correspondence
with the plurality of ink pressure chambers, each piezoelectric element having one end fixed to the base member and another
end attached to the diaphragm, each piezoelectric element generating displacement in a displacement direction for deforming
the diaphragm to eject ink droplets through a corresponding one of the plurality of nozzle holes; and
a dynamic vibration absorber mounted on the base member, wherein the base member isolates the dynamic vibration absorber from
the housing member, for damping vibrations of the base member to a resonance occurring in a frequency range less than or equal
to a predetermined frequency,
wherein the dynamic vibration absorber comprises a rigid member, and wherein an elastic member mounts the rigid member on
the base member,
wherein the base member has a first end a second end opposite to each other in the displacement direction,
wherein the plurality of piezoelectric elements is fixed to the first end,
wherein the rigid member is connected to the second end via the elastic member,
wherein the base member has an elongated shape extending in the alignment direction and has a predetermined mass,
wherein the rigid member has an elongated shape extending in the alignment direction and has a predetermined mass,
wherein the elastic member comprises a plurality of flexible adhesive layers arranged in the alignment direction, each flexible
adhesive layer having a predetermined thickness and an adhesive area, and
wherein the rigid member is fixed to the base member via the plurality of flexible adhesive layers.
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