JP2007076128A5 - - Google Patents

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JP2007076128A5
JP2007076128A5 JP2005266190A JP2005266190A JP2007076128A5 JP 2007076128 A5 JP2007076128 A5 JP 2007076128A5 JP 2005266190 A JP2005266190 A JP 2005266190A JP 2005266190 A JP2005266190 A JP 2005266190A JP 2007076128 A5 JP2007076128 A5 JP 2007076128A5
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liquid
longitudinal direction
length
discharge head
liquid discharge
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JP2005266190A
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JP4668020B2 (en
JP2007076128A (en
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Priority claimed from JP2005266190A external-priority patent/JP4668020B2/en
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Claims (8)

記録液の液滴を吐出するノズルと、このノズルが連通する液室と、この液室の壁面を形成する振動板と、この振動板を変位させる積層型圧電素子とを備え、
前記積層型圧電素子は、電圧印加で振動板方向への変位を生じる活性部と変位を生じない不活性部とを有し、前記振動板に連結部を介して連結されている液体吐出ヘッドにおいて、
前記積層型圧電素子が変位を生じたときに、前記連結部と前記積層型圧電素子との連結面が平坦であり、連結領域長手方向中央部に凹みを有しないことを特徴とする液体吐出ヘッド。 A nozzle that ejects droplets of the recording liquid, a liquid chamber that communicates with the nozzle, a diaphragm that forms a wall surface of the liquid chamber, and a laminated piezoelectric element that displaces the diaphragm,
In the liquid discharge head, the multilayer piezoelectric element includes an active portion that generates a displacement in a vibration plate direction when a voltage is applied and an inactive portion that does not generate a displacement, and is connected to the vibration plate via a connecting portion. ,
A liquid discharge head characterized in that when the multilayer piezoelectric element is displaced, the coupling surface between the coupling part and the multilayer piezoelectric element is flat and has no recess in the central part in the longitudinal direction of the coupling region. . 請求項１に記載の液体吐出ヘッドにおいて、前記活性部の長手方向の長さＬｐ（μｍ）は、前記連結部の長手方向の長さＬｊ（μｍ）に対して、Ｌｐ≦Ｌｊ＋５００、の関係にあることを特徴とする液体吐出ヘッド。   2. The liquid ejection head according to claim 1, wherein a length Lp (μm) in the longitudinal direction of the active portion is in a relationship of Lp ≦ Lj + 500 with respect to a length Lj (μm) in the longitudinal direction of the connecting portion. A liquid discharge head characterized by being provided. 請求項２に記載の液体吐出ヘッドにおいて、前記活性部の長手方向の長さＬｐ（μｍ）は、前記連結部の長手方向の長さＬｊ（μｍ）に対して、Ｌｐ≧Ｌｊ＋３００、の関係にあることを特徴とする液体吐出ヘッド。   3. The liquid ejection head according to claim 2, wherein the length Lp (μm) in the longitudinal direction of the active portion is in a relationship of Lp ≧ Lj + 300 with respect to the length Lj (μm) in the longitudinal direction of the connecting portion. A liquid discharge head characterized by being provided. 請求項２又は３に記載の液体吐出ヘッドにおいて、前記活性部の長手方向の長さＬｐ（μｍ）は、１１００（μｍ）より長く、１５００（μｍ）より短いことを特徴とする液体吐出ヘッド。   4. The liquid discharge head according to claim 2, wherein a length Lp (μm) in the longitudinal direction of the active portion is longer than 1100 (μm) and shorter than 1500 (μm). 5. 請求項１ないし４のいずれかに記載の液体吐出ヘッドにおいて、前記不活性部の長手方向の長さＬｕ（μｍ）は、前記活性部の長手方向の長さＬｐ（μｍ）に対して、Ｌｕ≦−０．５×Ｌｐ＋９５０、の関係にあることを特徴とする液体吐出ヘッド。   5. The liquid ejection head according to claim 1, wherein a length Lu (μm) of the inactive portion in the longitudinal direction is Lu relative to a length Lp (μm) of the active portion in the longitudinal direction. A liquid discharge head having a relationship of ≦ −0.5 × Lp + 950. 請求項５に記載の液体吐出ヘッドにおいて、前記不活性部の長手方向の長さＬｕ（μｍ）は１００（μｍ）以上であることを特徴とする液体吐出ヘッド。   6. The liquid discharge head according to claim 5, wherein a length Lu (μm) in the longitudinal direction of the inactive portion is 100 (μm) or more. 請求項１ないし６のいずれかに記載の液体吐出ヘッドにおいて、前記積層型圧電素子と前記振動板とは、前記活性部内に配置された前記連結部のみで連結され、前記不活性部は振動板とは連結されていないことを特徴とする液体吐出ヘッド。   7. The liquid ejection head according to claim 1, wherein the multilayer piezoelectric element and the vibration plate are connected only by the connection portion disposed in the active portion, and the inactive portion is a vibration plate. And a liquid discharge head, which is not connected to the liquid discharge head. 記録液の記録液の液滴を吐出する液体吐出ヘッドを備えた画像形成装置において、請求項１ないし７のいずれかに記載の液体吐出ヘッドを備えていることを特徴とする画像形成装置。   8. An image forming apparatus comprising a liquid ejection head for ejecting recording liquid droplets of a recording liquid, comprising the liquid ejection head according to claim 1.
JP2005266190A 2005-09-14 2005-09-14 Liquid ejection head and image forming apparatus Active JP4668020B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2005266190A JP4668020B2 (en) 2005-09-14 2005-09-14 Liquid ejection head and image forming apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2005266190A JP4668020B2 (en) 2005-09-14 2005-09-14 Liquid ejection head and image forming apparatus

Publications (3)

Publication Number Publication Date
JP2007076128A JP2007076128A (en) 2007-03-29
JP2007076128A5 true JP2007076128A5 (en) 2008-05-29
JP4668020B2 JP4668020B2 (en) 2011-04-13

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JP2005266190A Active JP4668020B2 (en) 2005-09-14 2005-09-14 Liquid ejection head and image forming apparatus

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5151844B2 (en) * 2008-09-16 2013-02-27 株式会社リコー Droplet ejection head, droplet discharge device, and image forming apparatus
JP5736660B2 (en) * 2009-11-26 2015-06-17 株式会社リコー Liquid ejection head and image forming apparatus

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000334949A (en) * 1999-06-01 2000-12-05 Ricoh Co Ltd Ink jet head
JP2001063041A (en) * 1999-08-25 2001-03-13 Ricoh Co Ltd Laminated piezoelectric element
JP2004160941A (en) * 2002-11-15 2004-06-10 Ricoh Co Ltd Liquid jet head and inkjet recorder

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