JPS5993356A - Ink head - Google Patents

Ink head

Info

Publication number
JPS5993356A
JPS5993356A JP20317782A JP20317782A JPS5993356A JP S5993356 A JPS5993356 A JP S5993356A JP 20317782 A JP20317782 A JP 20317782A JP 20317782 A JP20317782 A JP 20317782A JP S5993356 A JPS5993356 A JP S5993356A
Authority
JP
Japan
Prior art keywords
ink
reservoir chamber
nozzle
shape
head
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.)
Granted
Application number
JP20317782A
Other languages
Japanese (ja)
Other versions
JPH0342186B2 (en
Inventor
Masashi Yasuda
昌司 安田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanyo Electric Co Ltd
Sanyo Denki Co Ltd
Original Assignee
Sanyo Electric Co Ltd
Sanyo Denki Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sanyo Electric Co Ltd, Sanyo Denki Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP20317782A priority Critical patent/JPS5993356A/en
Publication of JPS5993356A publication Critical patent/JPS5993356A/en
Publication of JPH0342186B2 publication Critical patent/JPH0342186B2/ja
Granted legal-status Critical Current

Links

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
    • B41J2/14—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
    • 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
    • B41J2002/14338—Multiple pressure elements per ink chamber

Landscapes

  • Particle Formation And Scattering Control In Inkjet Printers (AREA)

Abstract

PURPOSE:To stabilize printing operations without causing dispersion in the sizes of ink droplets to be injected by a method in which at least a part of the wall of a liquid trap chamber is made of a shape-memory alloy, and the temperature of the alloy is controlled to vary the volume of the liquid trap chamber. CONSTITUTION:The upper wall face of a liquid trap chamber 33 from which ink packed inside is injected through a nozzle 34 is made of a working body of a shape-memory alloy (e.g., Ti-Ni alloy, etc.). The temperatures of the working bodies 35 and 36 are controlled by heaters 37 and 37' in such a way that they are restored to such a shape that the volume of the chamber 33 is reduced or increased at different restoring temperatures t1 and t2.

Description

【発明の詳細な説明】 この発明は、インクジェットプリンタのインクヘッドに
関し、構成の簡素化および印写動作の安定化を図ること
を目的とする。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ink head for an inkjet printer, and aims to simplify the configuration and stabilize the printing operation.

一般に、インクジェットプリンタは、所謂荷電制御式プ
リンタとインパルスジェット式プリンタとに大別され、
カラー化を図るには、構造の簡単な後者のインパルスジ
ェット式プリンタの方が有ンクヘッドには、＠１図に示
すようなメタルダイヤフラム型ヘッド、および第２図に
示すような一室型ヘッドがあり、第１図において、（１
）はヘッド本体、＋２１は本体（１）の中央部ないし後
端部に形成され内部にインクが充填された１５１ｉｌｌ
１３Ａ状の溜液室、（３）は本体（１）の前端部に形成
されインクタンク（図示せず）からのインクが流通する
インク流通路、（４）は溜液室（２）の前端部とインク
流通路（３）との間に設けられたピンホールを有するメ
タルダイヤフラム、（５）はインク流通路（３）と外部
とを連通して本体１１）の前面に形成されたノズル、（
６）は溜液室（２）の後端部を閉塞して設けられた振動
板、（７）は振動板（６）に接着されだピエゾ素子から
なる起振板、（８）は両端が振動板（６）および起振板
（７）に接続された交流電源であり、該電源（８）によ
り起振板（７）に通電されて振動板（６）が振動し、溜
液室（２）の容積が変化して溜液室（２）内のインクに
圧力が加えられ、ダイヤフラム〔４）のピンホールおよ
びノズル（５）を介してインク滴（９）が噴出され、こ
れらの動作が高速で繰り返されて記録紙上に所定の文字
等が印写される。Inkjet printers are generally divided into so-called charge control printers and impulse jet printers.
For color printing, the latter impulse jet printer has a simpler structure, and the ink head has a metal diaphragm type head as shown in Figure 1, and a one-chamber head as shown in Figure 2. Yes, in Figure 1, (1
) is the head body, +21 is the 151ill formed in the center or rear end of the main body (1) and filled with ink.
13A-shaped reservoir chamber; (3) is an ink flow path formed at the front end of the main body (1) through which ink from an ink tank (not shown) flows; (4) is the front end of the reservoir chamber (2). a metal diaphragm having a pinhole provided between the part and the ink flow path (3); (5) a nozzle formed on the front surface of the main body 11) communicating the ink flow path (3) with the outside; (
6) is a diaphragm provided by closing the rear end of the reservoir chamber (2), (7) is an oscillation plate made of a piezo element glued to the diaphragm (6), and (8) is a diaphragm with both ends closed. This is an AC power source connected to the diaphragm (6) and the oscillating plate (7), and the oscillating plate (7) is energized by the power source (8), causing the diaphragm (6) to vibrate, causing the reservoir chamber ( 2), pressure is applied to the ink in the reservoir chamber (2), and ink droplets (9) are ejected through the pinhole of the diaphragm [4] and the nozzle (5), and these operations is repeated at high speed to print predetermined characters, etc. on the recording paper.

まだ、第２図において、００はヘッド本体、（１］）は
ヘッド本体００に形成され内部にインクが充填された溜
液室、０りはインクタンク（図示せず）と溜液室（１１
）の後端部とを連通したインク流通路、０づは溜液室（
１１）Ω前端部と外部とを連通して本体叫の前面に形成
されたノズノペ（１３は本体００の」二面に透設された
溝ｔ１（ｉ　Ｊ＝に振動膜ａｄを介して貼着されたピエ
ゾ素子からなる起振板であり、交流電源０→により起振
板０］に通電されることにより、起振板０■が変形して
溜液室（１１）の容積が変化し、溜液室αη内のインク
に圧力が加えられ、ノズル０のを介してインク滴が噴出
され、これらの動作が高速で繰り返されて記録紙上に所
定の文字等が印写される。In FIG. 2, 00 is the head body, (1) is the reservoir chamber formed in the head body 00 and filled with ink, and 0 is the ink tank (not shown) and the reservoir chamber (11).
), the ink flow path communicates with the rear end of the reservoir chamber (
11) A nozzle is formed on the front surface of the main body so as to communicate the front end of the main body with the outside. When the vibration plate 0 is energized by the AC power source 0→, the vibration plate 0 is deformed and the volume of the reservoir chamber (11) changes. Pressure is applied to the ink in the reservoir chamber αη, ink droplets are ejected through the nozzle 0, and these operations are repeated at high speed to print a predetermined character or the like on the recording paper.

しかし、前記両ヘッドによると、インク滴の形成周期が
長いだめ、印写時間が長くなるという欠点がある。However, both of the heads described above have a drawback that the printing time is longer because the ink droplet formation period is longer.

そこで、第３図に示すように、ヘッド本体００にインク
が充填された複数個の溜液室００を形成し、各溜液室Ｏ
Ｑと外部とを連通ずる複数個のノズルθカを本体００に
形成するとともに、各溜液室０・ごとに、本体０均に形
成された溝上に振動膜を介してピエゾ素子からなる起動
板（図示せず）を貼着して第２図に示す一室型ヘッドを
複数個組合わせたマルチノズルヘッドが実施されている
が、複数個の起振板が本体Ｃ！１０に貼着されているた
め、各ノズル（１メから噴出されるインク滴の大きさに
ばらつきが生じ、安定した印写動作を行なうことができ
ないという不都合が生じるとともに、前記各起振板の大
きさをある程度以下に小さくすることができないだめ、
所定の大きさの本体０υには一定の個数以」二のノズル
ａカを形成することができず、ノズルの集積化を図るこ
とができないという欠点がある。Therefore, as shown in FIG. 3, a plurality of reservoir chambers 00 filled with ink are formed in the head main body 00, and each reservoir chamber O
A plurality of nozzles θ that communicate with the outside are formed in the main body 00, and for each reservoir chamber 0, an activation plate made of a piezo element is placed on a groove formed in the main body 0 through a vibrating membrane. A multi-nozzle head has been implemented in which a plurality of one-chamber heads shown in FIG. 10, the size of ink droplets ejected from each nozzle (1) varies, causing the inconvenience of not being able to perform a stable printing operation. It is not possible to reduce the size below a certain level,
There is a drawback that more than a certain number of nozzles cannot be formed in a main body of a predetermined size, and nozzles cannot be integrated.

さらに、インパルスジェットプリンタのインクヘッドと
して、第４図に示すような所謂熱バブル型ヘッドも実施
されている。同図において、（１８）はヘッド本体、θ
０は下面が開口して本体（１８１に形成され内部にイン
クが充填される溜液室、θ４は溜液室０９と外部とを連
通して本体０８）に形成されたノズル、（イ）はフィン
關を有する放熱体、（２１）は放熱体（４」−に設けら
れたペルチェ素子からなる冷却体、（イ）け冷却体動）
」−に設けられたアルミニウム板、（ハ）はアルよリ ミニラム板（イ）上に接着剤（２４１１着されて形成さ
れた絶縁層、（ハ）は絶縁層（ハ）上に設けられた発熱
体、（イ）は発熱体（ハ）上に設けられた電極、（ハ）
は電極（イ）上に形成され溜液室００の下面を閉塞した
発熱体（ハ）の保護層、（ハ）は放熱体翰の放熱を促進
させるファンであり、電極翰を介して発熱体翰に通電さ
れると、同図（ｂ）に示すように、発熱体（ハ）の熱に
より、ノズル０４内に気泡−が発生し、気泡−の圧力に
よシノズル０４から記録紙（至）にインク滴叫）が噴出
されて所定の文字等が印写される。Furthermore, a so-called thermal bubble type head as shown in FIG. 4 has also been implemented as an ink head for impulse jet printers. In the figure, (18) is the head body, θ
0 is a reservoir chamber formed in the main body (181 with an open bottom surface and filled with ink), θ4 is a nozzle formed in the main body 08 to communicate the reservoir chamber 09 with the outside, (21) is a cooling body consisting of a Peltier element provided on the heat dissipation body (4); (a) Cooling body movement)
``-'', (c) is an insulating layer formed by adhering adhesive (2411) on the aluminum plate (a), (c) is a heat generating layer provided on the insulating layer (c). body, (a) is the electrode provided on the heating element (c), (c)
is a protective layer of the heating element (c) formed on the electrode (a) and closing the lower surface of the reservoir chamber 00, and (c) is a fan that promotes heat radiation from the heating element holder, which is connected to the heating element through the electrode holder. When the wire is energized, air bubbles are generated in the nozzle 04 due to the heat of the heating element (c), as shown in FIG. Ink droplets are ejected and predetermined characters, etc. are printed.

しかし、前記熱バブル型ヘッドでは、気泡−の生成周期
が長いため、インク滴（３１）の形成周波数が］ＫＨｚ
と非常に低くなり、前記メタルダイヤフラム型ヘッドや
一室型ヘッドの場合よシも印写時間が長くなるという問
題がある。However, in the thermal bubble type head, since the generation period of bubbles is long, the formation frequency of the ink droplets (31) is [KHz].
This results in a very low printing time, and there is a problem in that the printing time becomes longer than in the case of the metal diaphragm type head or the one-chamber type head.

この発明は、前記の点に留意してなされたものであり、
内部に充填されたインクをノズルを介して噴出する溜液
室を備えたインクヘッドに射いて、前記溜液室の壁面の
少なくとも一部を形状記憶合金から構成し、前記形状記
憶合金の温度を制御して前記溜液室の容積を変化させる
制御部を設けたことを特徴とするインクヘッドを提供す
るものである。This invention was made with the above points in mind,
Ink filled inside is ejected through a nozzle to an ink head equipped with a reservoir chamber, at least a part of the wall of the reservoir chamber is made of a shape memory alloy, and the temperature of the shape memory alloy is lowered. The present invention provides an ink head characterized in that it is provided with a control section that controls and changes the volume of the reservoir chamber.

したがって、この発明のインクヘッドによると、溜液室
の壁の少なくとも一部を形状記憶合金から構成したこと
により、構成を簡素化することができるとともに、噴出
されるインク滴の大きさのばらつきをなくして印写動作
の安定化を図ることができる。Therefore, according to the ink head of the present invention, since at least a portion of the wall of the reservoir chamber is made of a shape memory alloy, the structure can be simplified and variations in the size of ejected ink droplets can be reduced. Without this, the printing operation can be stabilized.

つぎに、この発明を、その実施例を示した図面とともに
詳細に説明する。Next, the present invention will be described in detail with reference to drawings showing embodiments thereof.

まず、１実施例を示した第５図について説明する。First, FIG. 5 showing one embodiment will be explained.

同図において、（３２）は上面の一部が開口したヘッド
本体、（３３）は本体（３匂に形成され内部にインクが
充填された溜液室、（３４）は溜液室（３３）と外部と
を連通して本体（３乃の前面に形成されたノズル、＋３
５）　、　（３（至）は本体嬌の開口部に本体（３２に
一体に形成されて溜液室（３３）の土壁面をそれぞれ構
成するＴ　ｉ　−Ｎ　ｉ合金等の形状記憶合金からなる
第１．第２作動体であり、それぞれ異なる復元温度Ｈ，
ｔ２で、予め記憶した溜液室（３３）の容積を減少させ
る形状および前記容積を増加させる形状に復元し、両件
動体＋３５）　、　（３６）の」二面にそれぞれ貼着さ
れたヒータ（３η、（３Δおよびヒータ（３ｒ＋　、　
（：つｄへの通電を制御する電源部からなる制御部によ
り、両件動体ｆｇａ　、　＋３６１の温度が制御される
。In the same figure, (32) is a head main body with a part of the upper surface open, (33) is a reservoir chamber formed in the main body (3 parts) and filled with ink, and (34) is a reservoir chamber (33). The nozzle formed on the front of the main body (+3) communicates with the outside.
5), (3 (to) is made of a shape memory alloy such as Ti-Ni alloy, which is formed integrally with the main body (32) and constitutes the soil wall surface of the reservoir chamber (33), respectively, at the opening of the main body cap. 1st and 2nd working bodies, each having a different restoration temperature H,
At t2, the stored liquid chamber (33) is restored to the previously stored shape that reduces the volume and the shape that increases the volume, and the heaters ( 3η, (3Δ and heater (3r+,
The temperature of both moving objects fga, +361 is controlled by a control unit consisting of a power supply unit that controls energization to d.

そして、ヒータ（３７）により第１作動体（３５）を温
度ｔ１に加熱するとともに、第２作動体（３６）を温度
も２よりも低温に冷却すると、第１作動体（３０が溜液
室（３３）の容積を減少する形状、すなわち第５図に示
す状態から溜液室（３３）側にわん曲するような形状に
復元するとともに、第２作動体（３６）が第５図に示す
ような形状になり、溜液室（３３）の容積が減少して溜
液室（３３）内のインクに圧力が加えられ、ノズル（３
４）を介してインク滴が噴出される。Then, when the first working body (35) is heated to a temperature t1 by the heater (37) and the second working body (36) is cooled to a temperature lower than 2, the first working body (30) is heated to a temperature t1. (33) is restored from the shape that reduces the volume, that is, the state shown in FIG. 5, to the shape that is curved toward the reservoir chamber (33), and the second actuating body (36) is restored as shown in FIG. The volume of the reservoir chamber (33) decreases, pressure is applied to the ink within the reservoir chamber (33), and the nozzle (3
4) ink droplets are ejected through.

一方、第１作動体（３（へ）を温度ｔ１よりも低温に冷
却するとともに、ヒータ（３Δによシ第２作動体（３６
）を温度（，２に加熱すると、第１作動体卵が第５図に
示す形状になるとともに、第２作動体（３６）が溜液室
（３３）の容積を増加する形状、すなわち第５図に示す
状態から外側にわん曲するような形状に復元し、溜液室
（３３）の容積が増加して溜液室り（３）内にインクが
流入し、これらの動作が繰り返され、ノズル（３４）か
らインク滴がばらつきなく噴出されて記録紙」二に所定
の文字等が印写される。On the other hand, the first actuating body (3) is cooled to a temperature lower than the temperature t1, and the second actuating body (36) is cooled to a temperature lower than the temperature t1.
) to a temperature of (,2), the first actuating body egg assumes the shape shown in FIG. The shape shown in the figure is restored to the outwardly curved shape, the volume of the reservoir chamber (33) increases, ink flows into the reservoir chamber (3), and these operations are repeated. Ink droplets are uniformly ejected from the nozzle (34) and predetermined characters, etc. are printed on the recording paper.

しだがって、前記実施例によると、溜液室（３３）の上
壁面を形状記憶合金からなる第１．第２作動体１３５）
　ｌ　（３６）から構成したことにより、従来のように
ヘッド本体に起振板等を貼着する必要もなく、構成を簡
単にすることができ、噴出されるインク滴の大きさのば
らつきをなくして印写動作の安定化を図ることができる
。Therefore, according to the embodiment, the upper wall surface of the reservoir chamber (33) is formed by the first layer made of a shape memory alloy. Second operating body 135)
(36), there is no need to attach a vibrating plate or the like to the head body as in the conventional case, and the configuration can be simplified, eliminating variations in the size of ejected ink droplets. This makes it possible to stabilize the printing operation.

さらに、形状記憶合金は、粉末を焼結することにより容
易に製造することができるため、前記粉末の焼結により
両件動体ｊ：（５）　、　（３６）を形成することがで
き、溜液室（３３）の微細な形状を容易に形成すること
ができる。Furthermore, since shape memory alloys can be easily manufactured by sintering powder, both moving bodies j: (5) and (36) can be formed by sintering the powder, and the The fine shape of the chamber (33) can be easily formed.

なお、第６図に示すように、本体（３８）に形成された
複数個の溜液室（３９）の壁面の一部を形状記憶合金か
らなる作動体（４０）により構成し、マルチノズルヘッ
ドを形成してもＪ：い。As shown in FIG. 6, a part of the wall surface of a plurality of reservoir chambers (39) formed in the main body (38) is constituted by an actuating body (40) made of a shape memory alloy, and a multi-nozzle head is constructed. Even if J: is formed.

また、第７図に示すように、形状記憶合金によりヘッド
本体（４１）を形成Ｉ１、前記本体（４１）に溜液室（
４２）およびノズル（４３）を形成し、本体（４Ｉ）に
制御部のヒータ（個を貼着し、溜液室（４匂の全壁面を
形状記憶合金により構成するようにしてもよい。In addition, as shown in FIG. 7, the head body (41) is formed of a shape memory alloy I1, and the body (41) has a reservoir chamber (11).
42) and a nozzle (43), a heater of the control section may be attached to the main body (4I), and the entire wall surface of the reservoir chamber (4I) may be made of a shape memory alloy.

【図面の簡単な説明】[Brief explanation of drawings]

第１図ないし第４図はそれぞれ従来のインクヘッドを示
し、第１図は１例の切断左側面図、第２図は他の例の切
断左側面図、第３図はさらに他の例の切断左側面図、第
４図はさらに他の例であり、同図（ａ）は切断正面図、
同図（ｂ）は切断右側面図、第５図以下の図面はこの発
明のインクヘッドの実施例を示し、第５図はｌ実施例の
切断左側面図、第６図は他の実施例の斜視図、第７図は
さらに他の実施例の切断左側面図である。 （：１１３）　、　（３９）　、　（州・・・溜液室、
（３４）　、　（４３）・・・ノズル、（３７）　、　
ｔ３ｎ　。 （４４）・・・ヒータ。 代理人　弁理士　　藤田龍太部1 to 4 respectively show conventional ink heads, FIG. 1 is a cutaway left side view of one example, FIG. 2 is a cutaway left side view of another example, and FIG. 3 is a cutaway left side view of another example. A cut left side view, FIG. 4 is still another example, and FIG. 4(a) is a cut front view,
FIG. 5(b) is a cutaway right side view, FIG. 5 and the following drawings show embodiments of the ink head of the present invention, FIG. 5 is a cutaway left side view of the first embodiment, and FIG. 6 is another embodiment. FIG. 7 is a cutaway left side view of still another embodiment. (:113), (39), (state...reservoir chamber,
(34), (43)...nozzle, (37),
t3n. (44)...Heater. Agent: Patent Attorney Ryutabe Fujita

Claims (1)

【特許請求の範囲】[Claims] ■　内部に充填されたインクをノズルを介して噴出する
溜液室を備えだインクヘッドにおいて、前記溜液室の壁
面の少なくとも一部を形状記憶合金から構成し、前記形
状記憶合金の温度を制御して前記溜液室の容積を変化さ
せる制御部を設けたことを特徴とするインクヘッド。■ In an ink head equipped with a reservoir chamber from which ink filled inside is ejected through a nozzle, at least a part of the wall surface of the reservoir chamber is made of a shape memory alloy, and the temperature of the shape memory alloy is controlled. An ink head characterized in that the ink head is provided with a control unit that changes the volume of the reservoir chamber.
JP20317782A 1982-11-18 1982-11-18 Ink head Granted JPS5993356A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20317782A JPS5993356A (en) 1982-11-18 1982-11-18 Ink head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20317782A JPS5993356A (en) 1982-11-18 1982-11-18 Ink head

Publications (2)

Publication Number Publication Date
JPS5993356A true JPS5993356A (en) 1984-05-29
JPH0342186B2 JPH0342186B2 (en) 1991-06-26

Family

ID=16469728

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20317782A Granted JPS5993356A (en) 1982-11-18 1982-11-18 Ink head

Country Status (1)

Country Link
JP (1) JPS5993356A (en)

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US6764166B2 (en) * 1997-07-15 2004-07-20 Silverbrook Research Pty Ltd. Ejecting ink using shape memory alloys
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