JPS60206654A - Liquid jet recording device - Google Patents

Abstract

PURPOSE:To facilitate a high speed recording of high density and to obtain a high quality image recording by providing walls on a cover plate in such a manner as to section respectively combinations of discharge openings and electrothermal converters to which these openings face. CONSTITUTION:On a substrate 1 heat-generating resistors 2 that convert electrical energy into thermal energy are placed. Facing the substrate 1 an orifice plate 3 is provided as a cover plate. Orifices 4 (ink discharge opening) are opened in the positions that face the exothermic resistors 2 of the orifice plate 3 and, further, barriers 5 are provided in the manner as closely adhered to the lower surface of the orifice plate 3. The substrate 1, heat generating resistors 2, orifice plate 3 and the barriers 5 surround a portion which forms liquid flow paths 6 and these paths are supplied and filled with ink which works as a recording liquid.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Technology E 1] The present invention relates to a single-unit jet printer such as an inkjet printer that performs recording using flying droplets formed by jetting an oil body from a jetting port. The present invention relates to a recording device, particularly a liquid jet recording device that uses thermal energy.

[Prior art]

Conventionally, there are various types of liquid jet recording devices.
The liquid jet recording device disclosed in the publication can easily perform high-speed color recording, and the recording head, which is the main part of the output section, ejects recording liquid to form flying droplets. Because the discharge ports (orifices) for the image can be arranged in a hole-like manner, it is possible to obtain pre-resolving power, and at the same time,
As a recording head, it can be made compact overall and suitable for single-product production, and it takes full advantage of the advantages of IC technology and micro-processing technology, which have seen remarkable technological progress and improved reliability in the semiconductor field. As a result, lengthening and planarization (2
Recently, it has been attracting a lot of attention due to its ease of dimensionalization.

Menko et al., Conventional multi-orifice type recording device
' is provided with a liquid ME path corresponding to each orifice, and the liquid 1
ju: i! 8, an electrothermal transducer is provided as a means for applying thermal energy to the liquid filling the liquid flow path and ejecting the liquid from the corresponding orifice to form flying droplets. The structure is such that liquid is supplied from a common liquid chamber communicating with each static flow path. For this reason, if each orifice is arranged in i'+r1 trillion: degree, each liquid flow path will inevitably become narrower and the wall resistance of the liquid flow path will increase, and during high-speed recording, the liquid supply ( refil
l) cannot be followed, so droplet formation becomes unstable and it becomes impossible to record one image of surface quality at high speed.

In order to solve this problem of liquid supply when performing high-speed recording, and to make the liquid supply speedy and smooth, the liquid flow path walls between each liquid flow path were removed to create a large space. The solution is to design a liquid chamber so that a sufficient amount of liquid can be quickly and smoothly supplied to the liquid chamber.

In this case, since there is no separating wall between adjacent electrothermal converters, interaction occurs in liquid discharge between adjacent orifices, and liquid is discharged independently from each orifice. It becomes difficult. For example, if the electrothermal converters corresponding to adjacent orifices are driven independently, the ON
At the same time, liquid is discharged from the orifice connected to the air-thermal converter, and the adjacent one is in the OFF state.
Even if liquid is ejected from the orifice corresponding to the electrothermal sample, or even if liquid is not completely ejected, movement or vibration of the meniscus may occur, causing interference that adversely affects stable liquid ejection from the adjacent orifice. cause an effect. Therefore, if there is such an interference effect, the discharge state of the liquid discharged from each orifice becomes unstable, and the flight speed, flight direction, droplet diameter, etc. of the formed droplets are unstable, In many cases, it becomes impossible to record high-quality images.

In this point, the orifices are arranged at a high degree of
When recording an image having a quality of 1000 yen at a high speed, an even more serious problem arises due to the increase in the amount of thermal energy generated by the electrothermal transducer.

Furthermore, in conventional multi-orifice type recording heads, all the component parts are mounted on a board, so the manufacturing process is concentrated only on the board, and the structure on the board is complicated. Because of this, the manufacturing process is time consuming and the yield is poor.

〔the purpose〕

Therefore, the purpose of the present invention is to solve the above-mentioned points 3 and 3. 41
A chamber is provided with a liquid for forming target droplets;
1lAI (a plurality of electrothermal conversion members disposed on the bottom of the 9th chamber and generating thermal energy acting on the above !4 quarters; a lid member facing the bottom of the liquid chamber and closing the liquid chamber; , a plurality of ejection ports disposed in the lid member to face each of the plurality of electrothermal conversion members and communicating with the liquid chamber to eject the liquid to form the flying droplets; In the liquid jet recording apparatus, each combination of the ejection port and the electrothermal conversion member facing the ejection port is 71-
Liquid jet recording is provided with a wall arranged on the lid member so as to limit the amount of water that can be used, and can easily perform high-density and high-speed recording, is suitable for high-quality image recording by high-quality personnel, and can realize further cost reduction. The goal is to provide equipment.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the drawings.

The first section is a sectional view showing an example of the configuration of the recording head portion of the liquid jet recording apparatus of the present invention.

Here, (2) is a substrate, and on this substrate (1), a heating resistor (7b) is arranged as an electrothermal conversion member for converting air energy into thermal energy. (An orifice plate 3 serving as a cover member is placed opposite the root 1, and a liquid η〈A is formed by other members (not shown).Each heating resistor of this orifice plate 3 2, a liquid flow path 6 is formed by a portion surrounded by an orifice (ink ejection opening) thermal resistor 2, an orifice plate 3, and a barrier 5, and this liquid flow path 6 is filled with ink, which is a 1M liquid. are supplied and fulfilled.

The heating resistor 2 generates heat by applying a print signal current corresponding to printing from a control unit (not shown), and this heat is transmitted to the ink in the liquid path 6, thereby causing the heating resistor 2 to generate heat. The ink on the surface foams at 7A. Since the second state change is accompanied by a sudden change in volume, a sudden pressure is applied to the ink in the liquid flow path 6, and in response to this pressure, ink is ejected from the orifice 4, resulting in a splash 41! At the same time as iM and Xi are formed, the bubbles on the p4H resistor 2 disappear.

gi2 figure is '+' r l Figure i,: Show t Note S!
He'71" ?j8 /7) 4' Indicates blood IRI,
In this figure, the orifice &3 is omitted as q'1, and each arrangement position of the orifice 4 is shown by a dashed line.

/The helia 5 is arranged so as to surround the heating resistor 2 from three sides, and the ink from the orifice 1 is ! (The ink liquid is supplied to the liquid flow path 6 after discharging the liquid from the remaining one-way supply lower which is opened without disposing the barrier 5.
Although the barrier 5 and the substrate 1 may be in close contact with each other, a gap 8 may be provided as shown in FIG.

Materials for the barrier 5 include metal, ceramic, glass,
Resin, com or those? 9 composite material with high ink resistance can be used, and before or after forming the shape of the barrier 5, adhesive bonding, brazing, welding, etc. are used for the orifice plate 3. The above-mentioned structure can be manufactured by carrying out a rich IF.

Thus, according to the embodiment, orifice the barrier. 11fJ' because it is formed in close contact with the substrate side and does not require adhesion to the substrate side, making it possible to decentralize and simplify the manufacturing process.

It is possible to shorten processing time and improve yield, and furthermore, it is possible to improve mass productivity and reduce costs. Therefore, conventional problems can be solved all at once.

Furthermore, it is not necessary to make close contact between the barrier 5 and the substrate l, and for example, as shown in FIG. By keeping a small j'; 11, the ffi W of the ink
L!・Leakage of ink and air bubbles to the outside of the liquid flow path 6 during ejection,
1 due to its interference with the adjacent orifice 4.
1. Neglecting the destabilization of l output due to the surface tension of the bubble-ink interface and the viscous resistance of the ink in the narrow path of the gap 8, Fj
It can be kept as small as possible. Furthermore, since the pressure increase in the liquid flow path 6 due to ink bubbling can be used as an irritating effect to eject ink droplets, the flying speed, flying direction, and droplet diameter of the ink liquid can be stabilized. Same as above, that is, it can greatly contribute to stable ink ejection. Furthermore,
Since the liquid flow path 6 is short, there is a slight viscous resistance when the ink flows in the liquid flow path 6. By increasing the ink ejection frequency, the response limit of the ink liquid supply in the I- case can be increased by 1.1.

〔effect〕

As explained below-1-, according to the present invention, even if the ink ejection ports are arranged at ii, :, +i electric power, the ink is ejected from the 1. soil outlet well and stably. Therefore, high-density and high-quality images can be obtained at high speed.

Further, according to the present invention, since the manufacturing process is decentralized and simplified, the manufacturing process can be improved and the manufacturing cost can be reduced.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an example of the structure of the head section of the travel body injection recording device of the present invention; Fig. 2 is a plan view showing the recording head section shown in Fig. 1 with its orifice plate removed. 1nj diagram. A...1 room. L... Board, 2... Heating resistor L body, 3... L7 chair! , 4... Orifice, 5... Barrier, 6... Liquid flow path. 7... Supply port, 8... Gap part. Patent applicant Canon Co., Ltd. Representative Patent attorney Yoshi Tani

Claims (1)

[Claims] A liquid chamber to which a liquid for forming flying droplets is supplied;
11 I'I1. A plurality of electrothermal conversion members are disposed on the bottom of the chamber and generate thermal energy that acts on the liquid meter, and the liquid chamber is closed facing the bottom, l=f.
a plurality of lid members disposed on the lid member facing each of the plurality of electrothermal conversion members and communicating with the liquid chamber to eject the liquid to form the flying droplets; In a liquid jet recording device having an ejection port, the ejection port and the ejection port face each other. A liquid jet recording device characterized in that the lid member is provided with an I-wall arranged so as to limit each combination of air-thermal conversion members to an IF.