JP6801495B2 - 液体噴射ヘッド及び液体噴射装置 - Google Patents
液体噴射ヘッド及び液体噴射装置 Download PDFInfo
- Publication number
- JP6801495B2 JP6801495B2 JP2017027324A JP2017027324A JP6801495B2 JP 6801495 B2 JP6801495 B2 JP 6801495B2 JP 2017027324 A JP2017027324 A JP 2017027324A JP 2017027324 A JP2017027324 A JP 2017027324A JP 6801495 B2 JP6801495 B2 JP 6801495B2
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- Prior art keywords
- electrode
- piezoelectric
- layer
- pressure generating
- liquid injection
- Prior art date
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- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/16—Production of nozzles
- B41J2/1621—Manufacturing processes
- B41J2/164—Manufacturing processes thin film formation
- B41J2/1646—Manufacturing processes thin film formation thin film formation by sputtering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/14—Structure thereof only for on-demand ink jet heads
- B41J2/14201—Structure of print heads with piezoelectric elements
- B41J2/14233—Structure of print heads with piezoelectric elements of film type, deformed by bending and disposed on a diaphragm
- B41J2002/14241—Structure of print heads with piezoelectric elements of film type, deformed by bending and disposed on a diaphragm having a cover around the piezoelectric thin film element
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/14—Structure thereof only for on-demand ink jet heads
- B41J2/14201—Structure of print heads with piezoelectric elements
- B41J2002/14306—Flow passage between manifold and chamber
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/14—Structure thereof only for on-demand ink jet heads
- B41J2002/14419—Manifold
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
- B41J2202/01—Embodiments of or processes related to ink-jet heads
- B41J2202/11—Embodiments of or processes related to ink-jet heads characterised by specific geometrical characteristics
Description
かかる態様によれば、圧電体能動部を駆動した際の、第1の方向の両側の振動板である腕部の圧力発生室と隔壁との境界近傍の最大主応力が、押さえ部材が設けられたことにより低減され、振動板のクラック発生を抑制することができる。
かかる態様では、圧電体能動部を駆動した際の、第1の方向の両側の振動板である腕部の圧力発生室と隔壁との境界近傍の最大主応力が、押さえ部材が設けられたことにより低減され、振動板のクラック発生を抑制することができる液体噴射装置が実現できる。
図1は、本発明の実施形態1に係る液体噴射ヘッドの一例であるインクジェット式記録ヘッドの斜視図であり、図2はインクジェット式記録ヘッドの平面図、図3はその断面図であり、図4及び図5は、図3の要部を拡大した断面図である。
図3に示すように、圧電素子300を構成する第1電極60は圧力発生室12毎に切り分けられ、圧電素子300毎に独立する個別電極を構成する。そして第1電極60は、圧力発生室12の第1の方向Xにおいては、圧力発生室12の幅よりも狭い幅で形成されている。すなわち圧力発生室12の第1の方向Xにおいて、第1電極60の端部は、圧力発生室12に対向する領域の内側に位置している。圧力発生室12の第2の方向Yでは、第1電極60の両端部は、それぞれ圧力発生室12の外側まで延設されている。なお、第1電極60の材料は、金属材料であれば特に限定されないが、例えば、白金(Pt)、イリジウム(Ir)等が好適に用いられる。
このような再加熱処理を行う温度は、圧電体膜74の焼成温度(圧電体前駆体膜73を加熱して結晶化する温度)の−10℃以上、+50℃以下であるのが好ましい。
次に、図19に示すように、流路形成基板用ウェハー110の圧電素子300側に、シリコンウェハーであり複数の保護基板30となる保護基板用ウェハー130を接着剤38を介して接合した後、流路形成基板用ウェハー110を所定の厚みに薄くする。
上述した実施形態1と同様の製造方法によって、押さえ部材37の幅W2を変更した以外は同様にしてインクジェット式ヘッドを形成した。押さえ部材37の幅W2は、隔壁11の幅より突出した領域の幅W3の隔壁11の幅W1に対する割合で示した(表1参照)。
比較のため、押さえ部材37を設けない以外は、実施例と同様にしてインクジェット式記録ヘッドを製造した。
実施例1〜10、比較例1の圧電素子300を駆動した際の最大主応力と、応力集中部の位置を求めた。
一方、応力集中部は、ほぼ押さえ部材37の端部に対応する位置に移動することがわかった。
図22に実施形態2に係るインクジェット式記録ヘッドの要部断面図を示す。図22に示すように、本実施形態では、押さえ部材37Aの接合面の第1の方向Xの両端部近傍に、第2の方向Yに亘って溝371を設けたものであり、他の構成は実施形態1と同様である。
図23に実施形態3に係るインクジェット式記録ヘッドの要部断面図を示す。図23に示すように、本実施形態では、押さえ部材37Bの接合面近傍の第1の方向Xの両端の側壁を90°から傾斜させた形状とした以外の構成は実施形態1と同様である。このように接合面と側壁372との成す角の角度θを変化させることにより、最大主応力の大きさを変化させることができ、最大主応力の大きさのコントロールが可能である。
上述した実施形態1と同様の製造方法によって、押さえ部材37Bの角度θを変更した以外は同様にしてインクジェット式ヘッドを形成した。なお、押さえ部材37Bの幅W2は、隔壁11の幅より突出した領域の幅W3の隔壁11の幅W1に対する割合を0.10とした(表2参照)。
比較のため、押さえ部材37Bを設けない以外は、実施例と同様にしてインクジェット式記録ヘッドを製造した。
実施例11〜23、比較例2の圧電素子300を駆動した際の最大主応力と、応力集中部の位置を求めた。
以上、本発明の一実施形態について説明したが、本発明の基本的な構成は上述したものに限定されるものではない。
例えば、上述した実施形態では、各能動部310の圧電体層70が連続的に設けられた構成を例示したが、勿論、圧電体層70は、能動部310毎に独立して設けられていてもよい。また、例えば、上述した実施形態1では、第2電極80を複数の能動部310の共通電極とし、第1電極60を各能動部310の個別電極としたが、特にこれに限定されず、例えば、第1電極60を複数の能動部310に共通する共通電極とし、第2電極80を各能動部310の個別電極としてもよい。このように、第1電極60を複数の能動部310の共通電極とする場合、第1電極60を複数の能動部310に亘って設けるため、例えば、弾性膜51及び絶縁体膜52を設けずに、第1電極60のみが振動板として作用するようにしてもよい。また、上述した実施形態1のように第1電極60が個別電極として設けられた場合であっても、また、第1電極60が共通電極として設けられた場合であっても、圧電素子300自体が実質的に振動板を兼ねるようにしてもよい。ただし、流路形成基板10上に直接第1電極60を設ける場合には、第1電極60とインクとが導通しないように第1電極60を絶縁性の保護膜等で保護するのが好ましい。つまり、基板(流路形成基板10)上に第1電極60が設けられているとは、基板の直上も、間に他の部材が介在した状態(上方)も含むものである。
また、圧力発生室12、インク供給路13、連通路14、連通部15の内壁に、酸化タンタル等からなる保護膜を形成してもよい。
Claims (5)
- 液体を噴射するノズル開口に連通する圧力発生室が第1の方向に隔壁を介して並設される流路形成基板と、
該流路形成基板の一方面側に振動板を介して設けられ、第1電極、前記第1電極上方に設けられる圧電体層、及び該圧電体層上方に設けられる第2電極を備える圧電素子と、を具備し、
前記第1電極及び第2電極によって前記圧電体層が挟まれた領域である圧電体能動部が前記圧力発生室のそれぞれに対向する領域に設けられており、
前記振動板上の前記圧力発生室の間の前記隔壁のそれぞれに対向する領域に押さえ部材がそれぞれ接合され、前記押さえ部材の前記第1の方向の寸法である幅が前記隔壁の幅と同等又はそれより大きく、前記押さえ部材と前記振動板との接合する接着剤の前記第1の方向の寸法である幅が、前記隔壁の幅以下である
ことを特徴とする液体噴射ヘッド。 - 前記流路形成基板の前記圧電素子が設けられた側には、前記圧電素子を保持する空間である圧電素子保持部を有する保護基板が接合され、前記押さえ部材は、前記保護基板に一体的に又は別体として設けられている
ことを特徴とする請求項1に記載の液体噴射ヘッド。 - 前記押さえ部材の前記隔壁より前記圧力発生室側へ突出した部分の前記第1の方向の寸法W3の前記隔壁の幅W1に対する割合(W3/W1)が0.02以上0.50以下である
ことを特徴とする請求項1又は2に記載の液体噴射ヘッド。 - 前記押さえ部材の前記振動板との接合面近傍の前記第1の方向の両側の側壁と前記接合面との成す角は、10°以上135°以下である
ことを特徴とする請求項1〜3のいずれか一項に記載の液体噴射ヘッド。 - 請求項1〜4のいずれか一項に記載の液体噴射ヘッドを具備することを特徴とする液体噴装置。
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