BACKGROUND OF THE DISCLOSURE

Field of the Disclosure

The present disclosure relates to a method of manufacturing a liquid discharge head and the liquid discharge head.

Description of the Related Art

A liquid discharge apparatus such as an ink jet printer includes a liquid discharge head configured to discharge liquid (ink). An example of such a liquid discharge head includes a liquid discharge head including a substrate in which a plurality of substrates is stuck together.

Japanese Patent Application Laid-Open No. 2018-83365 discusses a liquid discharge head in which a first substrate (recording element substrate) and a second substrate (support member) are stuck together. A discharge port configured to discharge liquid is formed on a side of a first surface of the first substrate. The first substrate includes a first liquid flow passage (supplying port) penetrating through the first surface and a second surface opposite to the first surface. A second liquid flow passage is opened on a third surface (a surface on the side of the first substrate) of the second substrate. The first substrate and the second substrate are stuck together by bonding the second surface and the third surface with an adhesive agent.

In the liquid discharge head as discussed in Japanese Patent Application Laid-Open No. 2018-83365, the second surface of the first substrate is stuck to the second substrate. In a process of manufacturing the liquid discharge head, the second surface may come into contact with a component of a manufacturing apparatus (a substrate suction stage of an exposure apparatus or a laminating apparatus, an electrostatic chuck of a substrate joining apparatus, or the like). Thus, the second surface may be contaminated by deposit adhering to the component of the manufacturing apparatus.

In a case where the second surface of the first substrate and the third surface of the second substrate are to be bonded with an adhesive agent in a state where the deposit adheres to the second surface as described above, adhesion between the second surface and the third surface may not be satisfactory due to the deposit. If the adhesion is not satisfactory, a gap is formed between the second surface and the third surface. On the second surface, the first liquid flow passage is opened. Therefore, if an opening of the first liquid flow passage communicates with the gap, the liquid may leak from the gap. If the liquid leaks, the liquid may flow out of the liquid discharge head, or the liquid may flow out into an adjacent liquid flow passage, causing color mixture of the liquid or the like.

SUMMARY OF THE DISCLOSURE

According to an aspect of the present disclosure, a method of manufacturing a liquid discharge head includes preparing a first substrate where a discharge port configured to discharge liquid is formed to face a first surface, a concave portion is formed on a side of a second surface opposite to the first surface, and a first liquid flow passage penetrating from the first surface to the second surface is opened inside the concave portion on the side of the second surface, preparing a second substrate including a second liquid flow passage opened on a third surface, and sticking the first substrate and the second substrate to communicate the first liquid flow passage with the second liquid flow passage by bonding a bottom face of the concave portion and the third surface with an adhesive agent.

Further features and aspects of the present disclosure will become apparent from the following description of example embodiments with reference to the attached drawings.

