JPH01209149A - Liquid jet apparatus - Google Patents
Liquid jet apparatusInfo
- Publication number
- JPH01209149A JPH01209149A JP3555288A JP3555288A JPH01209149A JP H01209149 A JPH01209149 A JP H01209149A JP 3555288 A JP3555288 A JP 3555288A JP 3555288 A JP3555288 A JP 3555288A JP H01209149 A JPH01209149 A JP H01209149A
- Authority
- JP
- Japan
- Prior art keywords
- electrodes
- piezoelectric ceramics
- piezoelectric ceramic
- liquid
- pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 31
- 239000000919 ceramic Substances 0.000 claims abstract description 31
- 239000000853 adhesive Substances 0.000 claims abstract description 13
- 230000001070 adhesive effect Effects 0.000 claims abstract description 13
- 239000002131 composite material Substances 0.000 claims abstract description 9
- 239000010419 fine particle Substances 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 8
- 239000004020 conductor Substances 0.000 claims abstract description 5
- 230000002093 peripheral effect Effects 0.000 abstract description 3
- 238000001816 cooling Methods 0.000 abstract description 2
- 239000002861 polymer material Substances 0.000 abstract 3
- 238000002347 injection Methods 0.000 description 8
- 239000007924 injection Substances 0.000 description 8
- 238000012360 testing method Methods 0.000 description 5
- 239000003822 epoxy resin Substances 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000007641 inkjet printing Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- B41J2/16—Production of nozzles
- B41J2/1621—Manufacturing processes
- B41J2/1623—Manufacturing processes bonding and adhesion
-
- 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
- B41J2/16—Production of nozzles
- B41J2/1607—Production of print heads with piezoelectric elements
- B41J2/1615—Production of print heads with piezoelectric elements of tubular type
-
- 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
- B41J2/16—Production of nozzles
- B41J2/1607—Production of print heads with piezoelectric elements
- B41J2/1618—Fixing the piezoelectric elements
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、インクジェットプリンタにおけるインク噴射
装置や、医療用機器若しくは理化学計測機器等に使用さ
れるマイクロポンプ等の液体噴射装置に関するものであ
り、特に圧電セラミックス管の変形を利用して、圧電セ
ラミックス管内に中空管を介して収容した液体を噴射す
る方式の液体噴射装置の改良に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an ink ejection device in an inkjet printer, a liquid ejection device such as a micropump used in medical equipment, physical and chemical measurement equipment, etc. In particular, the present invention relates to an improvement in a liquid ejecting device that uses deformation of a piezoelectric ceramic tube to eject a liquid contained in a piezoelectric ceramic tube through a hollow tube.
液体噴射装置としては、従来より種々の方式のものが提
案され実用化されているが、近年、圧電セラミックス管
を利用した方式のものが注目を集めている。この方式の
液体噴射の原理は、液体導管の外周に圧電セラミックス
管を嵌合し、この圧電セラミックス管に電圧を印加して
それを変形させることにより、液体導管内部に充満して
いる液体を液体導管先端に設けられている噴射口から噴
射させるものである。図は上記液体噴射装置の−例を示
す要部縦断面図である。同図において、１は圧電セラミ
ックス管であり、内外周面に各々電極２，３を設け、各
々にリード線４．５をはんだ付けする。次に６は中空管
であり、一方に噴射ロアを設け、接着剤８を介して、前
記圧電セラミックス管１内面に固着するのである。Various types of liquid ejecting devices have been proposed and put into practical use, but in recent years, those using piezoelectric ceramic tubes have been attracting attention. The principle of this method of liquid injection is that a piezoelectric ceramic tube is fitted around the outer circumference of a liquid conduit, and a voltage is applied to the piezoelectric ceramic tube to deform it, thereby discharging the liquid filling the liquid conduit. It is injected from an injection port provided at the tip of the conduit. The figure is a longitudinal sectional view of a main part showing an example of the liquid ejecting device. In the figure, reference numeral 1 denotes a piezoelectric ceramic tube, and electrodes 2 and 3 are provided on the inner and outer peripheral surfaces of the tube, respectively, and lead wires 4.5 are soldered to each tube. Next, 6 is a hollow tube, one of which is provided with an injection lower, and is fixed to the inner surface of the piezoelectric ceramic tube 1 via an adhesive 8.
上記液体噴射装置を製作するには、中空管６を圧電セラ
ミックス管１内面に固着する場合に使用する接着剤とし
ては、エポキシ樹脂を使用するのが最も一般的である。In manufacturing the above-mentioned liquid injection device, epoxy resin is most commonly used as the adhesive used to fix the hollow tube 6 to the inner surface of the piezoelectric ceramic tube 1.
一方液体噴射装置としての使用温度は通常は０〜４０℃
程度であるが、保管若しくは輸送中には一３０℃程度の
環境に置かれることがあり、高低温度差は７０Ｍ程度と
なる。On the other hand, the operating temperature as a liquid injection device is usually 0 to 40℃.
However, during storage or transportation, it may be placed in an environment of about -30°C, and the temperature difference between high and low temperatures is about 70M.
例えばインクジェットプリンタにおいては、−３０℃に
おいて一定時間保持した後、室温に復帰させた場合のイ
ンク吐出電圧が、前記の低温（−３０℃）保持前より１
０％程度高くなる現象が発生する。これは圧電セラミッ
クス管１内面の亀裂。For example, in an inkjet printer, when the temperature is returned to room temperature after being held at -30°C for a certain period of time, the ink ejection voltage is 1
A phenomenon occurs in which the value increases by about 0%. This is a crack on the inner surface of piezoelectric ceramic tube 1.
電極２の剥離等に起因するものと認められる。すなわち
圧電セラミックス管１および中空管６とエポキシ樹脂か
らなる接着剤８との熱膨張差により。It is recognized that this is caused by peeling of the electrode 2, etc. That is, due to the difference in thermal expansion between the piezoelectric ceramic tube 1, the hollow tube 6, and the adhesive 8 made of epoxy resin.
前記低温冷却時において、圧電セラミックス管１に引張
り応力が作用することに起因する。因みに圧電セラミッ
クスの線膨張係数は３．ＯＸ １０−６／にであり、一
方中空管６として通常使用されるガラスの線膨張係数は
３．３ｘ １０−６／にであるが。This is due to tensile stress acting on the piezoelectric ceramic tube 1 during the low-temperature cooling. Incidentally, the linear expansion coefficient of piezoelectric ceramics is 3. OX 10-6/, while the coefficient of linear expansion of the glass normally used as the hollow tube 6 is 3.3x 10-6/.
エポキシ樹脂のそれは６０ Ｘ １０−６／にである。That of epoxy resin is 60 x 10-6/.
一方線膨張係数の低い接着剤８を製造することは極めて
困難であり、前記熱膨張差を解消することができないと
いう問題点がある。また圧電セラミックス管１の変形に
よる液体の噴射は、その内面に接着剤８で固着した中空
管６を介して行なわれるものであるから、中空管６およ
び／または接着剤８の層厚を大にすると液体の噴射に必
要以上の大なる外力が必要であり、甚だしきは噴射作用
に支障を来すという問題点がある。On the other hand, it is extremely difficult to manufacture adhesive 8 with a low coefficient of linear expansion, and there is a problem that the difference in thermal expansion cannot be eliminated. Furthermore, since the liquid is ejected by deforming the piezoelectric ceramic tube 1 through the hollow tube 6 fixed to its inner surface with an adhesive 8, the layer thickness of the hollow tube 6 and/or the adhesive 8 must be adjusted. If the size is increased, an excessively large external force is required to jet the liquid, which may even impede the jetting action.
本発明は上記のような従来の技術に存在する問題点を解
消し、構成部材に亀裂３割れその他の前記熱膨張差に起
因する不都合が発生することのない液体噴射装置を提供
することを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to solve the problems existing in the conventional technology as described above, and to provide a liquid injection device that does not cause cracks or other problems caused by the difference in thermal expansion in its constituent members. shall be.
上記目的を達成するために１本発明においては内外周面
に各々電極を設けた圧電セラミックス管内に接着剤を介
して中空管を保持し、前記圧電セラミックス管に電極を
介して駆動電圧を印加し。In order to achieve the above object, 1 in the present invention, a hollow tube is held via an adhesive within a piezoelectric ceramic tube provided with electrodes on its inner and outer peripheral surfaces, and a driving voltage is applied to the piezoelectric ceramic tube via the electrodes. death.
圧電セラミックス管および中空管を変形させ、中空管内
に収容した液体を噴射させるように構成した液体噴射装
置において、前記電極を、導電性材料からなる基地中に
高分子材料からなる微粒子を分散させた複合材料によっ
て形成する。という技術的手段を採用した。In a liquid injection device configured to deform a piezoelectric ceramic tube and a hollow tube to inject a liquid contained in the hollow tube, the electrode is formed by dispersing fine particles made of a polymeric material in a base made of a conductive material. It is made of composite material. A technical method was adopted.
また９本発明は中空管内にインクを収容するインクジェ
ットプリンタ用のインク噴射装置において特に有効であ
る。Further, the present invention is particularly effective in an ink jetting device for an inkjet printer that stores ink in a hollow tube.
上記の構成により、圧電セラミックス管の内面に設けた
電極と接着剤との固着力が減少し、電極が剥離する等の
不都合を解消する作用がある。すなわち、電極を形成す
る複合材料中の高分子材料。The above configuration reduces the adhesion force between the electrodes provided on the inner surface of the piezoelectric ceramic tube and the adhesive, and has the effect of eliminating problems such as peeling of the electrodes. i.e. the polymeric material in the composite forming the electrode.
例えばテフロン（商品名）は摩擦係数が極めて小である
から、接着剤と電極との間の固着力を減少させるため、
低温度（例えば−３０℃）に冷却した際に圧電セラミッ
クス管に作用する引張り応力が小となり、圧電セラミッ
クス管の亀裂９割れを防止する。なお実際の使用温度で
ある０〜４０℃においては、前記引張り応力は極めて小
であるため、圧電セラミックス管、接着剤および中空管
は夫々相互に接触、保持されている。従って作動時にお
ける圧電セラミックス管の変形を中空管に充分伝達する
ことが可能であり、液体噴射機能には全く支障はないの
である。For example, Teflon (trade name) has an extremely low coefficient of friction, so it reduces the adhesion force between the adhesive and the electrode.
When the piezoelectric ceramic tube is cooled to a low temperature (for example, -30° C.), the tensile stress acting on the piezoelectric ceramic tube becomes small, thereby preventing cracks in the piezoelectric ceramic tube. Note that at the actual operating temperature of 0 to 40° C., the tensile stress is extremely small, so the piezoelectric ceramic tube, adhesive, and hollow tube are held in contact with each other. Therefore, the deformation of the piezoelectric ceramic tube during operation can be sufficiently transmitted to the hollow tube, and there is no problem with the liquid injection function.
外径１ 、１ ｍ 、内径０．ｈｎ、長さ１０Ｍの圧電
セラミックス管の内外面に、ニッケルからなる基地中に
粒子径０．１〜０．５μｍの微粒子状のポリテトラフル
オロエチレン樹脂（ＰＴＦＥ）を１０容量％分散させた
複合材料によるメツキを施して、厚さ１．０〜３．０μ
ｍの電極とした。この場合のメツキ浴の温度は６０〜９
０℃、浸漬時間は３〜６分とするのが好ましい。上記電
極材料以外は従来と同様の構成として、前記の図に示す
ような液体噴射装置を作製し、−２０℃と６０℃との間
のヒートショック試験（４サイクル）を実施した。Outer diameter 1.1 m, inner diameter 0. hn, a composite material in which 10% by volume of polytetrafluoroethylene resin (PTFE) in the form of fine particles with a particle size of 0.1 to 0.5 μm is dispersed in a base made of nickel on the inner and outer surfaces of a piezoelectric ceramic tube with a length of 10M. The thickness is 1.0~3.0μ by plating with
m electrode. The temperature of the plating bath in this case is 60-9
Preferably, the temperature is 0°C and the immersion time is 3 to 6 minutes. A liquid ejecting device as shown in the figure above was manufactured with the same configuration as the conventional one except for the above electrode material, and a heat shock test (4 cycles) between -20°C and 60°C was conducted.
上記ヒートショック試験後の観察において、亀裂２電極
剥離等の不良は１００本中０本であると共に、インク吐
出電圧は試験の前後において変化がないことを確認した
。一方従来構造のものについて同一条件の試験を行なっ
た結果は、電極剥離。In the observation after the above heat shock test, it was confirmed that there were no defects such as cracks and separation of two electrodes out of 100, and there was no change in the ink ejection voltage before and after the test. On the other hand, when testing the conventional structure under the same conditions, the results showed that the electrode peeled off.
亀裂等の不良発生が１００木中２１本であり、これらの
ものは何れもインク吐出電圧は試験前より１０％以上高
くなっていた。Defects such as cracks occurred in 21 out of 100 trees, and the ink ejection voltage of all of these was more than 10% higher than before the test.
本実施例においては、電極形成材料として二・２ケル基
地中にＰＴＦＥからなる微粒子を分散させた複合材料を
使用した例を示したが、一般に複合材料としては導電性
材料からなる基地中に、摩擦係数が小である高分子材料
からなる微粒子を分散させたものを使用することができ
る。また微粒子径２分散量、メツキ厚さ等は、液体噴射
装置の用途その他の条件を勘案して適宜選定することが
できる。なお対象とする液体はインクに限定されず。In this example, an example was shown in which a composite material in which fine particles made of PTFE were dispersed in a base of 2.2 Kel was used as an electrode forming material, but in general, as a composite material, in a base made of a conductive material, It is possible to use a material in which fine particles made of a polymeric material having a small coefficient of friction are dispersed. Further, the amount of fine particle diameter 2 dispersion, plating thickness, etc. can be appropriately selected in consideration of the application of the liquid ejecting device and other conditions. Note that the target liquid is not limited to ink.
水、薬液等の他の液体にも拡大できることは当然である
。It goes without saying that the invention can be extended to other liquids such as water and chemical solutions.
図は本発明の対象である液体噴射装置の一例を示す要部
縦断面図である。
１：圧電セラミックス管、２．３＝電極、６：中空管。The figure is a longitudinal sectional view of a main part showing an example of a liquid ejecting device that is a subject of the present invention. 1: piezoelectric ceramic tube, 2.3=electrode, 6: hollow tube.
Claims (2)
内に接着剤を介して中空管を保持し、前記圧電セラミッ
クス管に電極を介して駆動電圧を印加し、圧電セラミッ
クス管および中空管を変形させ、中空管内に収容した液
体を噴射させるように構成した液体噴射装置において、
前記電極を、導電性材料からなる基地中に高分子材料か
らなる微粒子を分散させた複合材料によって形成したこ
とを特徴とする液体噴射装置。(1) A hollow tube is held within a piezoelectric ceramic tube with electrodes provided on its inner and outer circumferential surfaces through an adhesive, and a driving voltage is applied to the piezoelectric ceramic tube through the electrodes. In a liquid ejecting device configured to deform and eject liquid contained in a hollow tube,
A liquid ejecting device characterized in that the electrode is formed of a composite material in which fine particles made of a polymeric material are dispersed in a base made of a conductive material.
ジェットプリンタ用である請求項１記載の液体噴射装置
。(2) The liquid ejecting apparatus according to claim 1, wherein the liquid contained in the hollow tube is ink, and the liquid is for use in an inkjet printer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3555288A JPH01209149A (en) | 1988-02-18 | 1988-02-18 | Liquid jet apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3555288A JPH01209149A (en) | 1988-02-18 | 1988-02-18 | Liquid jet apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01209149A true JPH01209149A (en) | 1989-08-22 |
Family
ID=12444890
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3555288A Pending JPH01209149A (en) | 1988-02-18 | 1988-02-18 | Liquid jet apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01209149A (en) |
-
1988
- 1988-02-18 JP JP3555288A patent/JPH01209149A/en active Pending
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