JPS6189853A - Liquid jet recording head - Google Patents

Abstract

PURPOSE:To make the identification easy, by a method wherein a liquid recording head is manufactured using photosensitive resin whose colors are divided by adding dye or pigment of different color according to the difference of the specification of the nozzle of the liquid jet recording head. CONSTITUTION:Ink passage walls are formed on a substrate surface 8 on which liquid discharge energy generating bodies 2 are placed, and in the liquid jet recording heads 10, 11, 12 which are composed by laminating a cover 6 on ink passages 5, photosensitive resin are colored red, blue and yellow by adding dyes. In the colored liquid jet recording heads 13, the heads 10, 11, 12 are designed to discharge yellow liquid, magenta liquid and cyan liquid respectively. Blue colored photosensitive resin is used for the head 10 which discharges yellow liquid, for the head 11 which discharges yellow magenta liquid, and for the head 12 which discharges red cyan liquid. When heads of which shapes are resemble are assembled, the identification by colors is made easy.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a liquid jet recording head, and more specifically,
The present invention relates to a liquid jet recording head that accommodates means for forming so-called recording liquid droplets.

[Prior Art] Conventionally, as a method for producing such a liquid jet recording head, for example, after forming fine grooves on a glass or metal plate by cutting or etching, the plate with these grooves is placed on another plate. A method is known in which a liquid passage is formed by joining a suitable plate.

However, in the head made by such conventional method,
tJJ The inner wall surface of the liquid passage that is machined is too rough, and the liquid passage is distorted due to the difference in etching rate.
It is difficult to obtain a liquid passage with high precision, and variations tend to occur in the liquid ejection characteristics of the recording head after manufacturing.

Also, during cutting, the plate is easily chipped and cracked.
There is also the drawback of poor J manufacturing yield. When etching is performed, there are many manufacturing steps, which is disadvantageous in that it increases manufacturing costs.

Furthermore, the common drawbacks of the above-mentioned conventional methods include the use of a grooved plate in which liquid passage grooves are formed and a driving element such as a piezoelectric element 9 as a heating element as a liquid discharge energy generator for generating energy acting on the liquid. It is difficult to accurately align the respective positions when bonding with a bonded plate provided with a plate, which results in a lack of mass productivity.

°As a new manufacturing method for a liquid jet recording head that solves these drawbacks, a liquid passage wall made of a cured film of photosensitive resin is formed on a substrate on which a liquid ejection energy generator is installed, and then A method of manufacturing a liquid jet recording head in which a cover for the liquid passage wall is provided is disclosed in, for example, Japanese Patent Laid-Open No. 57-43878.
proposed in No.

A liquid jet recording head manufactured using a cured film of photosensitive resin as an ink passage wall has disadvantages of conventional liquid jet recording heads, such as the accuracy of the finish of the liquid passage and the complexity of the manufacturing process.
It is excellent in that it solves the drawback of low manufacturing yield.

Further, examples of the photosensitive resin include many resins used in the ordinary field of photolithography, such as photoresist. Examples include diazoresins, P-diazoquinones, photopolymer photopolymers using vinyl monomers and single initiators, duplex photopolymers using sensitizers such as polyvinyl cinnamate, orthonaphthoquinone diazide and borac. type phenolic resin, a mixture of polyvinyl alcohol and diazo resin, a polyether type photopolymer copolymerized with 4-glycidyl ethylene oxide and benzophenone or glycidyl chalcone, N,N-dimethyl methacrylamide and acrylamide benzophane, etc. copolymer, unsaturated polyester photosensitive resin [
For example, APR (Asahi Kasei), Tevista (odd), Sonne (
r: A Nishi Paint), etc.], unsaturated urethane oligomer-based photosensitive resin, photosensitive composition prepared by mixing a difunctional acrylic monomer with a light initiator and a polymer, 1 dichromic acid-based photoresist, non-chromium water-soluble photoresists, polyvinyl cinnamate photoresists, cyclized rubber-azide photoresists, and the like.

In addition, for example, DuPont's 110-manent photopolymer coating, RISTON, solder mask 7305, 7405, 730FR, 740FR, SMI
There is also a photosensitive composition commercially available under the trade name NearP.

However, most of the colors of photosensitive resins and general commercially available products made of the above ingredients are fruit or vegetable or red, and moreover, only one type of photosensitive resin is added to the resin. There are no examples of dyes or pigments having two or more types of colors, and therefore there were drawbacks as shown below.

(1) In the manufacturing process of a liquid jet recording head, when two or more liquid jet recording heads are lined up to manufacture a color liquid jet recording head in which recording of two or more colors is performed in rotation, the above-mentioned monochrome liquid jet recording After the heads are completed, it is necessary to arrange them in parallel and then inject liquid of a predetermined color into a predetermined head. Since the two heads have the same color (the most conspicuous color), it is difficult to distinguish between the heads, making it easy to make mistakes in liquid injection.

(2) Also the recording head 3! In the manufacturing process, two or more recording heads are lined up to produce a color recording head that can record two or more colors.

If the heads of each color have some differences in shape due to their assembly, the heads of each color must be assembled and fixed in a predetermined position, but the differences in shape of the heads are not very clear. Also, since the heads are the same color, assembly errors are likely to occur.

(3) Similarly, in the manufacturing process of a recording head, although it is a monochrome liquid jet recording head, for example, two or more types of liquids with different nozzle densities but with almost the same specifications in appearance are used. When jet recording heads are manufactured in parallel, it is difficult to distinguish between the heads both in terms of shape and color, which poses a major problem in process control and makes it easy for one mistake to occur.

(4) The above-mentioned items (1) to (3) are both undesirable in terms of process control, and cause an increase in the number of man-hours and a decrease in process yield, leading to an increase in the cost of the liquid jet recording head.

[Objective] It is an object of the present invention to solve the above-mentioned drawbacks, and to provide an inexpensive liquid jet recording head that has good workability, easy process control, reduced man-hours, and improved yield.

[Summary of the Invention] In the present invention, in order to achieve the above object, an ink passage wall constituting an ink passage is formed using a photosensitive resin cured film on a substrate surface on which a liquid ejection energy generator is installed, In a liquid jet recording head having a structure in which a cover is laminated on the ink passage, the color of the recording liquid used in the liquid jet recording head and/or the nozzle density of the liquid jet recording head is A structure using photosensitive resin with distinct colors was adopted.

[Example] Below, book 9. A specific example will be described in detail.

[First Example] A first example of the present invention is shown in FIGS. 1 and 2. In each figure, the symbol l is the orifice (nozzle part), 2 is the heating resistor (heating element) for generating discharge pressure, 4 is the liquid reservoir (storage part), 5 is the liquid wave path, and 8 is the heat generated by the serious offender. On the substrate on which the resistor is installed, there is wiring for sending electrical signals to the heat generating resistor 2 (not shown). Numeral 9 is a cured photosensitive resin that forms the liquid flow path and liquid reservoir and is laminated on the substrate 8.

Reference numeral 6 indicates a glass cover which is further provided as a layer on the photosensitive resin cured product. Further, reference numerals 10 to 12 are liquid jet recording heads formed in this way, and the reference numeral 13 is a color liquid jet recording head made by fixing these heads in parallel. Further, reference numeral 14 denotes a liquid supply pipe 1 for supplying liquid to the head.
5 is a support plate for fixing the parallel heads.

In this example, the composition shown in Table 1 was used as the photosensitive resin indicated by the reference numeral 9.

Table 1 (Example 1) Depending on the dye added, the photosensitive resin has 3! ! They are colored in similar colors: red, blue, and yellow.

On the other hand, due to the design of the color liquid jet recording head designated by numeral 13, the head designated by numeral 10 is yellow;
The head 1 is designed to eject liquid of each color, magenta, and the head 12 is designed to eject cyan for recording.

Therefore, in this embodiment, yellow photosensitive resin was applied to the head with code 10 that should eject yellow liquid.
In addition, a red photosensitive resin was used for the head 11 that should eject magenta liquid, and a blue photosensitive resin was used for the head 12 that should eject cyan liquid. .

As a result, when assembling heads 10, 11, and 12, which have similar shapes, into the state shown by 13, it is easy to distinguish them by one color, so there is no mistake in one set, and it is possible to assemble one head with good work efficiency. Ta. Furthermore, after completing the state shown by reference numeral 13, liquid of each color is filled through the liquid supply pipe 14. At this time, too, since each head is distinguished by color, it is certain that the liquid of each color is placed in the predetermined position. It is now possible to fill the head.

[Second example] Next, a second embodiment of the present invention will be described.

3 and 4 illustrate a second embodiment of the present invention, and in each figure, the same parts as in FIGS. 1 and 2 are given the same reference numerals, and their explanation will be omitted. Reference numeral 3 in each figure represents a piezoelectric element for generating discharge pressure. Although not shown, wiring for sending electrical signals to the piezoelectric element 3 is provided on the substrate 8.

Reference numerals 10 and 11 denote the liquid jet recording head thus formed, numeral 13 a color liquid jet recording head made by aligning these heads together, and numeral 14 supplying liquid to the head. This is a liquid supply pipe for

In this example, the photosensitive resin designated by reference numeral 9 has a composition as shown in Table 1. Table 2 (Example 2) Depending on the pigment added, the photosensitive resin has a white color.

It comes in two colors: red. On the other hand, in the design of the color liquid jet recording head designated by 13, the head designated by 10 discharges black liquid, and the head designated by 11 discharges red liquid to record on the recording paper. It looks like this. Therefore, in this embodiment, a white photosensitive resin was applied to the head with code 1O that should eject a black liquid.
Further, for the head 11 that should eject red liquid, a red photosensitive resin was used in the manufacturing process.

As a result, when assembling the similar shaped heads of to and 11 into the state shown by 13, it is possible to assemble them with good workability without making a mistake because they can be easily distinguished by color. In addition, after completion of the state shown in step 13, liquid of each color is filled through the liquid supply pipe 14, but since each head is distinguished by color, the liquid of each color is transferred to a predetermined channel for each color. Now it is possible to fill the 12th and 2nd without fail.

[Third Example] Next, a third example of the present invention will be described. gS5
The figure shows a third embodiment of the present invention, in which the liquid jet recording heads 21 and 22 are made with the same configuration as that described in the embodiment of the present invention:jSl, but the orifice is The degree of readiness of the array is different between 21 and 22, and 2
1 head has 4 wood/mm, 22 head has 8 wood/■
It is. Outside of this scenery, there is a striking resemblance in appearance as well. Now.

In this way, when two or more types of heads that are very similar in appearance but have different specifications are produced at the same time on a production line, it is difficult to distinguish them.
Although process control has been implemented to prevent the two heads from mixing together during manufacturing, troubles in which both heads mix together still occur frequently. Therefore, in this embodiment, a photosensitive resin having a red color is used for the head 21, and a photosensitive resin having a blue color is used for the head 22. It was produced using it in the manufacturing process.

The composition of the photosensitive resin is shown in Table 3. This results in
Even if both were produced during open production, the color distinction was clear, making it possible to completely prevent the trouble of mixing the two together.

Table 3 (Example 3) In the examples of the present invention, the dyes and pigments shown in Tables 1 to 3 were used to color the photosensitive resin. For example, to give a red color, most of the red disperse dyes, oil-soluble dyes, and kIA-based dyes can be used, and as pigments, silver tan (dilead tetroxide), Silver vermilion (mercuric sulfide), quinacridone, etc. can be used. In addition, to color the front threads, most of the dispersion, oil-soluble, and basic dyes can be used.Pigments include Guiney green (pyridian), cobalt blue (Tenar blue), and phthalocyanine blue. etc. can be used. In addition, to color mycelia, most of mycelia dispersion, oil-soluble, and basic dyes can be used, including pigments such as chrome yellow and titanium yellow.

Strontium chromate, litharge (-M lead chloride), isoindolinone yellow reddish, etc. can be used.

[Effects] As described above, the liquid passage wall and the liquid reservoir peripheral wall made of the photosensitive resin cured film are formed on the substrate surface on which the liquid ejection energy generating body is installed, and a cover is formed on the photosensitive resin cured crotch. In a liquid jet recording head having a laminated structure, the photosensitive resin may have different colors due to differences in the color of the recording liquid in the liquid jet recording head or in specifications such as nozzle density of the liquid jet recording head. Manufacturing using photosensitive resins with different colors added with dyes or pigments has the following effects.

(1) When making a liquid jet recording head capable of color recording by arranging two or more heads with the same specifications side by side, it is possible to This not only prevents mistakes and mistakes in the liquid injection process, but also facilitates identification, which improves work efficiency and reduces man-hours.

(2) Also, when producing two or more types of liquid jet recording heads at the same time that have different specifications but are superficially similar, the color of the photosensitive resin may be changed depending on the specifications of the heads. This has the effect of preventing troubles such as mixing of heads with different specifications, deterioration of work efficiency, and increase in man-hours due to this.

(3) From the above, it is possible to improve workability, reduce man-hours, and sufficiently reduce the cost of liquid jet recording heads.Furthermore, by distinguishing by color, it is possible to improve process management. It becomes easier.

[Brief explanation of drawings]

Figure 31 and Figure 2 explain the first embodiment of the present invention, where Figure 1 is an exploded perspective view and Figure 2 is a color liquid jet recording manufactured by combining the head shown in Figure 1. Explanatory diagrams of the head, Figures 3 and 4 are for explaining the second embodiment of the present invention, Figure 3 is an exploded perspective view, and Figure 4 is a collar manufactured by combining the heads in Figure 3. FIG. 5 is an explanatory diagram showing a third embodiment of the present invention. 1... Orifice 2... Heating resistor (heating element) 3... Piezoelectric element 4... Liquid reservoir 5... Liquid wave path 6... Cover 7... Liquid supply hole 8... Substrate 9...Photosensitive resin cured product 10.11.12...Liquid jet recording head 13...
Colorized liquid jet recording head l4...liquid supply pipe 1
5... Support plate section C) Figure 3 Figure 4

Claims (1)

[Claims] In a liquid jet recording head having a structure in which an ink passage wall constituting an ink passage is formed using a photosensitive resin cured film on a substrate surface on which a liquid ejection energy generator is installed, and a cover is laminated on the ink passage. , a liquid jetting method characterized in that photosensitive resins of different colors are used depending on the color of the recording liquid used in the liquid jetting recording head and/or the nozzle density of the liquid jetting recording head. recording head.