JPH065170Y2 - Liquid jet recording head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a liquid jet recording apparatus for ejecting ink to form ink droplets and adhering them to a recording material such as paper for recording. Relates to a recording head used for.

[Conventional technology]

The liquid jet recording method is a recording method in which ink (recording liquid) is ejected from an orifice provided in a recording head, and the ink is attached to a recording material such as paper to perform recording, and noise is extremely small. In addition, it has many advantages such as high-speed recording, plain paper can be used, and special recording paper is not required. Various types of recording heads and liquid jet recording devices have been devised. Has been done. The recording head usually has an orifice for ejecting ink, a liquid passage communicating with the orifice, and a liquid chamber communicating with the liquid passage as main parts.

[Problems to be solved by the invention]

However, in the head during printing, air bubbles are generated in the liquid chamber due to temperature rise and the like. The bubbles are likely to stay near the boundary between the liquid chamber and the liquid passage, interrupting the supply of ink to the liquid passage, and causing ink ejection failure.

It is an object of the present invention to provide a liquid jet recording head in which bubbles do not stay near the flow path.

[Means for Solving the Problems] The above object of the present invention is to provide a liquid jet recording head having an orifice for ejecting ink, a liquid passage communicating with the orifice, and a liquid chamber communicating with the liquid passage. This is achieved by a liquid jet recording head in which a sphere having a size that does not enter the liquid passage is contained in the liquid chamber.

The liquid jet recording head of the present invention, for example, has a liquid chamber of various liquid jet recording heads having a structure as shown in FIG.
It can be produced by inserting the sphere described below. Therefore, any structure other than the sphere of the present invention can be adopted as long as the effects described below can be obtained by inserting the sphere.

The sphere used for the head of the present invention moves in the liquid chamber by ink convection in the liquid chamber or by an external force, for example, by vibrating the head to move the sphere. When these spheres adhere to the wall of the liquid chamber and come into contact with the remaining bubbles, the bubbles are released from the wall and rise in the liquid to accumulate in the upper part of the liquid chamber as shown in FIG. It will not hinder the ink supply.

The material of the sphere is preferably as large as possible in specific gravity. For example, metal such as iron, glass, or plastic has a specific gravity of 2
The above and the like are preferably used. In addition, it is desirable that the surface that is easily deteriorated or corroded by the ink is subjected to surface treatment for forming an antioxidant treatment or other protective film.

Also, the size and number of spheres to be put in the liquid chamber are not particularly limited, but the size is about 1/2 of the height of the liquid chamber and / or a diameter of about 5 to 10 times the nozzle diameter, The volume occupied by the sphere was about 1% of the volume of the liquid chamber.

〔Example〕

FIG. 1 is a schematic sectional view of a liquid jet recording head of the present invention. Reference numeral 101 is an Al substrate, and 102 is a Si substrate, and a heating resistance layer, an electrode layer, a protective film and the like (not shown) are laminated on the Si substrate. 103 is a cured film of a photosensitive resin forming a 20 μm wide liquid passage (liquid passage DF), 104 is a cured photosensitive resin film used for joining the liquid passage DF103 and the glass dot plate 105. Is a top plate DF. The glass top plate 105 is provided with a dug portion that forms the common liquid chamber 106, and the height is about 1/2 of the glass top plate thickness (about 0.5 mm in this embodiment) as seen in this figure. Was done. 107 is a sphere diameter (0.2 mm) and specific gravity (7.8) made of iron), which is sufficiently larger than the liquid channel diameter so as not to block the liquid channel, and sufficiently higher than the liquid chamber height so that it can move freely in the liquid chamber. It was set to a small size.

[Effect of device]

As described above, by using the liquid jet recording head of the present invention,
Good printing can be performed without causing liquid ejection failure during printing.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a liquid jet recording head of the present invention,
FIG. 2 is a schematic vertical sectional view for explaining the effect obtained by the liquid jet recording head of the present invention, and FIG. 3 is a schematic exploded perspective view of the liquid jet recording head. 101: Al substrate 102: Si substrate 103: Liquid path DF 104: Top plate DF 105: Glass top plate 106: Liquid chamber 107: Sphere 108: Orifice 109: Bubble 110: Discharge energy generating element

Claims (1)

[Scope of utility model registration request] 1. A liquid jet recording head having an orifice for ejecting ink, a liquid passage communicating with the orifice, and a liquid chamber communicating with the liquid passage, so as not to enter the liquid passage into the liquid chamber. A liquid jet recording head characterized by containing spheres of various sizes.