Ink jet recording apparatus and method using ink jet head having u-shaped wiring

Abstract

An ink jet recording method includes the steps of providing an ink jet recording head having a plurality of discharge openings for discharging ink, a plurality of liquid passageways for holding ink and a plurality of heat generating members. Each of the heat generating members corresponds to a liquid passageway and each heat generating member has a pair of electrodes for driving the heat generating member individually and the electrodes and corresponding heat generating member form a U-shaped wiring portion. The recording head may be manufactured using a cutting process. A voltage is applied to selected pairs of electrodes for driving selected heat generating members individually for providing thermal energy to the ink in the liquid passageway for abruptly forming a bubble and discharging ink from the discharge opening and recording on a recording medium.

Description

[0001]This application is a continuation of application Ser. No. 08 / 159,709 filed Dec. 1, 1993, now abandoned, which in turn is a continuation of application Ser. No. 07 / 998,053 filed Dec. 29, 1992, now abandoned, which is a division of application Ser. No. 07 / 711,418 filed Jun. 5, 1991, now U.S. Pat. No. 5,204,689, which is a continuation of application Ser. No. 07 / 632,610, filed Dec. 27, 1990, now abandoned, which is a continuation of application Ser. No. 07 / 403,860, filed Sep. 1, 1989, now abandoned, which is a continuation of application Ser. No. 07 / 188,071, filed Apr. 28, 1988, now abandoned, which is a continuation of application Ser. No. 07 / 013,172 filed Feb. 9, 1987, now abandoned, which is a continuation of application Ser. No. 06 / 846,472 filed Mar. 31, 1986, now abandoned, which is a continuation of application Ser. No. 06 / 750,985 filed Jul. 1, 1985, now abandoned, which is a continuation of application Ser. No. 06 / 639,531 filed Aug. 9, 1984, now abandoned, which is a cont...

AI Technical Summary

Benefits of technology

[0017]In view of this point, it is another object of the present invention to provide an apparatus which is excellent in uniformity of ink droplets discharged, discharge responsiveness or discharge stability and long-tine continuous discharge stability.

[0018]It is still another object of the present invention to provide a compact apparatus which is capable of high-speed recording.

[0019]It is yet another object of the present invention to provide a novel droplet forming apparatus which is easy to manufacture and which can be made into a practical and highly dense multi-orifice type.

Problems solved by technology

This apparatus for forming droplets is not of the type which uses all of the ink supply including the liquid pressurizing means for causing the liquid stream to discharge, the deflection means for droplets and the formed droplets and therefore, requires a gutter for collecting unnecessary ones of the droplets and thus, it is difficult to make the entire apparatus compact.

Also, in this apparatus, the degree of the force forming the droplets is originally weak and therefore, there is only obtained insufficient uniformity of the droplet diameter.

Further, in the same apparatus, unless strict adjustment of the liquid pressurizing force is effected in the ink supply, it is not possible to provide uniformity of the diameters of the droplets, constant discharge speed thereof and uniformity of the discharge direction thereof.

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