JPS6239253A - Thermal ink jet recording device - Google Patents

Abstract

PURPOSE:To improve accuracy and durability by superposing and unifying an element, to both surfaces thereof a plurality of grooves are formed in parallel, and a substrate, on one surface thereof heating elements and lead electrodes are shaped, so that the heating elements and the grooves are positioned at corresponding positions on each surface of the element and constituting path groups for injecting droplets. CONSTITUTION:An element 1, to both surfaces thereof nozzles N1-N6 as path groups for injecting droplets are shaped in parallel, and substrates 2, 3, on one surfaces thereof heating elements R1-R6, selecting lead electrodes S1-S6 and common lead electrodes C1, C2 are formed, are joined and unified so that the heating elements and the nozzles are positioned mutually at corresponding positions. When the nozzles N1-N6 are supplied with ink for recording and electric pulses are inputted to the heating elements R1-R6, ink on the heating elements is evaporated quickly and changed into bubbles, and ink droplets 4 are discharged from an orifice surface A for the nozzles N1-N6. According to the method, the nozzles N1-N6 can be machined extremely precisely, thus acquiring a recording device, which has excellent durability and is proper to mass production and density thereof is increased and is changed into a multi-nozzle state.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a thermal inkjet recording device.

[Conventional technology]

In conventional inkjet recording apparatuses, it has been extremely difficult to achieve high density and multi-nozzle design due to the large area of the energy acting part for ejecting liquid from the M't nozzle and the complexity of the structure.

However, in thermal inkjet recording devices that generate bubbles using thermal energy and eject ink using the energy generated when the bubbles are generated, high density and multi-nozzle design are required due to the small area of the energy acting part and the simple structure. It became easy.

However, it is still the same due to constraints such as the size of the heating element, the width of the electrode, the distance between the electric spoons, the size of the nozzle, the distance between the nozzles, and the required bonding when joining the heating element substrate and the element with the groove for the nozzle. - There was a limit to forming nozzles in a high density row on the substrate surface.

[Problem that the invention seeks to solve]

In order to solve the above-mentioned problem, it is possible to integrate the substrate with the heating element and the element with the groove for the nozzle, and to stack a large number of Q' as a unit with the nozzle positions shifted, or to There was a method in which a number of elements were stacked one on top of the other, each having a heating element and a groove for a nozzle formed on the other side.

However, in the conventional method described above, it is very difficult to precisely control the nozzle pitch of the upper and lower parts when overlapping and joining together.

The present invention is intended to solve these problems, and its purpose is to provide a thermal inkjet recording device that has excellent accuracy and durability and is suitable for measurement.

Means for Solving Problem c] The thermal inkjet recording device of the present invention includes an element having a plurality of grooves arranged in parallel on both sides, a heating element on one side, and a lead as a means for energizing the heating element. The board equipped with the R koshiki,
It is characterized in that the heating element and the groove are overlapped and integrated in corresponding positions on each surface of the element to form a group of passages for jetting droplets.

〔Example〕

FIG. 1 is a bottom view of a recording head section of an inkjet recording apparatus according to an embodiment of the present invention, and details such as a recording ink supply system and a head drive circuit are not shown. Although a recording head having three nozzles and six nozzles on both sides is illustrated, the number can be increased as desired.

The recording head shown in FIG. 1 includes an element 1 having grooves, so-called nozzles N1 to N, arranged in parallel on both sides to form a group of passages for ejecting liquid droplets;
The substrates 2 and 3, which are provided with heating elements R and %R on one side, select lead electrodes 1~S@ as means for energizing the heating elements, and common lead electric ovens C1*C2, are connected to each other between the heating elements and the nozzle. are integrally joined so that they are at the corresponding position K.

In this illustrated example, after recording ink is supplied from the unillustrated ink supply system to the nozzles Nl and N from the direction of the arrow 5, the select leads N%81 to B6 and the common lead voltage [sCx #C2t- Heating element R1~
An electric pulse is input to R-. Then, the heating elements R1 to R generate thermal pulses in response to the electric pulses, and the ink on the heating elements rapidly vaporizes into bubbles due to the thermal pulses. The energy at the time of bubble generation causes the nozzle N1 to
Ink droplets 4 are ejected from the orifice surface A of N6. At this time, the deviation in the pitch P between the nozzles N, , N will directly result in dot deviation on the recording material, which will significantly impair the printing quality, so P must be manufactured with high precision.Nozzles N1 to N of the nozzle element l - can be formed, for example, by cutting with a microcutter on a glass substrate, etc., or by chemical methods such as etching and reverse sputtering, but especially dry etching using an ion shark can form grooves without side etching. can be obtained with high accuracy. A substrate 2#3 on which a heating element R1-R@ and lead electric currents S1 to Sa*C1*C1 as means for energizing the heating element are formed on one surface of this element 1 using a well-known imitation technique.
The heating element and nozzle are joined together so that they are in corresponding positions. At this time, since the nozzles N1-N@ are formed in advance on both sides of the element 1 with high accuracy, there is no fear that the nozzle pitch P will be out of order when the elements are joined and integrated.

FIG. 2 shows another embodiment, in which only the heating element mounting board 2 of the recording head of FIG. 1 is shown. By forming the common lead electric kettle on the same side as the orifice surface A, rather than on the same side where the heating element is installed, the heating element installation board 2 on the joint surface of the heating element installation board 2 and the nozzle element 1 can be formed. It is possible to eliminate the step on the top, making it possible to integrate more securely and improve durability.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to easily obtain a high-density, multi-nozzle thermal inkjet recording device that can be used for accuracy and durability, and is suitable for mass production. This has the effect that edge recording can be realized.

[Brief explanation of drawings]

FIG. 1 is a 11iIE diagram of a recording head of a thermal inkjet recording apparatus in an embodiment of the present invention. FIG. 2 is an illustration of another embodiment of the heating element installation board of the recording head shown in FIG. 1... Nozzle element 2.3.1 Heating element installation substrate 4... Ink droplet 5@... Recording ink supply direction R1-R6... Heating element R~8... Select lead electric bowl '1eC1...・Common lead electric spoon N violet to N6 ・Fist nozzle P...Pitch between nozzles or more

Claims (1)

[Claims] A substrate is provided with an element having a plurality of grooves in parallel on both sides, a heating element and a lead electrode as a means for energizing the heating element on one side, and a heating element and a groove on each side of the element. A thermal inkjet recording device characterized in that they are overlapped and integrated at corresponding positions to form a group of passages for ejecting droplets.