Ink ejecting printer head
AssigneeBrother Kogyo Kabushiki Kaisha
InventorYumiko Ohashi
Life of this patent
Estimating the term…
Abstract
An organic material is used as the protective film in the ink ejecting printer head with the surface roughness Ra of the protective film is set to be no greater than 3 .mu.m. Accordingly, the segregation of ink components is suppressed to ensure a smooth flow of ink. As a result, the variations in the volume of the ink droplets ejected is reduced and the ejecting stability is improved. Therefore, the ink ejecting printer head having such a protective film that is excellent in protection also improves the stability of the ejected ink droplets and can be manufactured at a low cost.
Claims11
An ink ejecting printer head, comprising:
- a piezoelectric ceramics plate having a plurality of walls with an ink chamber defined between each opposing pair of walls;
- an electrode on each said opposing pair of walls defining said ink chamber for deforming said walls of said ink chamber when a current is applied thereto;
- an organic protective film completely covering each said electrode for insulating and protecting said electrode, said organic protective film having a surface roughness Ra over an entire surface of no greater than 3 .mu.m;
- and
- a cover plate mounted on an end surface of each wall of the plurality of walls using an organic adhering member.
An ink ejecting printer head, comprising:
- a piezoelectric ceramics plate having a plurality of walls with an ink chamber defined between each opposing pair of walls;
- an electrode on each said opposing pair of walls defining said ink chamber for deforming said walls of said ink chamber when a current is applied thereto;
- a cover plate mounted on an end surface of each wall of the plurality of walls with an adhering member;
- and
- a protective film formed to completely cover each said electrode for insulating and protecting said electrode, wherein said protective film and the adhering member are formed of an organic material, said protective film having a surface roughness Ra of less than 3 .mu.m.
An ink ejecting printer head, comprising:
- a piezoelectric ceramics plate having a plurality of walls with an ink chamber defined between each opposing pair of walls;
- an electrode on each said opposing pair of walls defining said ink chamber for deforming said walls of said ink chamber when a current is applied thereto;
- a cover plate mounted on an end surface of each wall of the plurality of walls by an adhering member;
- and
- an organic protective film provided on each said electrode and extended to cover the end surface of each wall of said plurality of walls where said cover plate is provided, said protective film for insulating and protecting said electrodes, wherein said protective film has a surface roughness Ra no greater than 3 .mu.m.
Dependencies are inferred from the claim text.