JPS5831761A - Non-impact recorder - Google Patents

Abstract

PURPOSE:To improve the quality of an image by such an arrangement wherein ink droplets not used for recording are discharged by the operation of an electrostriction or magnetostriction vibrator for preventing the formation of liquid droplet and only ink droplets used for recording are caused to jet out from a nozzle hole and the variation of ink droplets is lessened. CONSTITUTION:In a non-impact recorder, ink is supplied from an ink supply hole 20 at a pressure and an electrostriction or magnetostriction vibrator 21 for forming liquid droplets is vibrating a certain frequency. Consequently, when an electrostriction or magnetostriction vibrator 25 for preventing the formation of liquid droplet is not in operation, in other words, when pressurized ink is not discharged from an ink exit 27, multiple ink droplets are spouted out from a nozzle hole 24. Here, image recording signal is supplied to the vibrator 25 for preventing the formation of liquid droplet, and ink droplets not used for recording, before they are formed, are discharged from the exit 27 by causing the vibrator 25 to operate.

Description

[Detailed description of the invention] The present invention relates to a novel non-innocuous recording device.

As non-injected recording devices, a multi-on-demand type ink jet recording device as shown in FIG. 1 and a multi-charge deflection type inkjet recording device as shown in FIG. 2 have been proposed. . However, the full-thio/demand type inkjet recording device shown in FIG. 1 requires a certain size for the vibrator 1 and the ponder chamber 2, making it difficult to arrange the nozzles 3 at a high density. . Further, in order to achieve high density, a configuration as shown in the figure has been considered, but it is necessary to bend the flow path 4 for guiding the ink to the nozzle 3. In that case, the formation of the flow path 4 is as follows. Although it can be easily processed by photo-etching or the like, it is extremely difficult to eject uniform ink droplets from each nozzle because the fluid resistance of each flow path is different. Also,
The multi-charge polarization and polarization type inkjet recording apparatus shown in FIG. It was necessary to arrange charging electrodes, deflection electrodes, etc. on the front surface, and the configuration was polar.

The present invention was made in view of the above-mentioned circumstances, and
In particular, the present invention aims to provide a new non-impact recording device that does not require electrodes or the like on the front surface of the nozzle and can easily achieve high density.
(a
) is a side sectional view of the main part, and (b) is a perspective view of the whole.
2 is an ink supply port, 21 is an electrostrictive or magnetostrictive vibrator for forming droplets, 22 is an ink supply channel, 23 is a nozzle plate, 24
25 is a nozzle hole, 25 is an electrostrictive or magnetostrictive vibrator for preventing droplet formation, 26 is an ink discharge channel, and 27 is an ink discharge port, through which ink is supplied under a pressure similar to that of the ink supply port 20, and is used to form droplets. The electrostrictive or magnetostrictive vibrator 21 is vibrating at a certain frequency. Therefore, when the electrostrictive or magnetostrictive oscillator 25 for preventing droplet formation is not operating, the ``I!'' If the pressurized ink is not discharged from the ink discharge port 27, ink droplets are ejected through the nozzle holes 24 (six in the illustrated example). Here, an image recording signal is supplied to the electrostrictive or magnetostrictive vibrator 25 for preventing droplet formation, and the ink droplets not used for recording are transferred to the electrostrictive or magnetostrictive vibrator 25 for preventing droplet formation before the ink droplets are formed. 25 is activated to discharge ink from the ink discharge port 27, no ink droplet is ejected from the nozzle hole associated with the activated electrostrictive paternal magnetostrictive vibrator for preventing droplet formation.
Ink droplets are ejected only from the nozzle hole associated with the electrostrictive or magnetostrictive vibrator for preventing droplet formation that was not activated.
Depending on the image recording signal, only the ink droplets used for recording can be ejected from the nozzle holes to perform desired recording. - The ink discharged from the ink discharge port is recovered by an ink recovery system (not shown) and used again for printing.

As is clear from the above description, according to the present invention, (1) unlike the conventional multi-on-demand type inkjet recording apparatus shown in FIG. In addition, since a desired number of ink droplets are formed at once using a common (single) electrostrictive or magnetostrictive vibrator for droplet formation, variations in the size, speed, etc. of the formed ink droplets are extremely small. Therefore, high quality images can be formed.

(2) The nozzle arrangement can be made denser.

(3) Even if each ink discharge channel is bent to increase the density of the nozzle array, the ink discharge channel only has to perform the function of discharging ink, so conventional multi-on-demand inkjet Unlike in a recording device, the formation of ink droplets is not hindered by bending of the ink flow paths (because the shapes of the respective ink flow paths are different).

(4) Unlike the conventional multi-charge deflection type inkjet recording device shown in Fig. 2, it does not require complicated electrodes on the front surface of the nozzle, and it is possible to configure an extremely thin non-impact recording device. There are advantages.

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining an example of a conventional multi-ink on-demand type ink recording apparatus, in which (a) is a side sectional view of the main part, (b) is a front view, and FIG. (5) FIG. 3 is a side cross-sectional view of main parts showing an example of a conventional multi-charge deflection type inkjet recording device.
(a) is a side sectional view of a main part, and (b) is an overall perspective view. 20... Ink supply port, 21... Electrostrictive or magnetostrictive vibrator for droplet formation, 22... Ink supply channel, 23...
Nozzle plate, 24... Nozzle hole, 25... Electrostrictive or magnetostrictive vibrator for preventing droplet formation, 26... Ink discharge channel, 27... Ink discharge port. (6)・11゛IC tb) Figure 2 Figure 3 (0) (b)

Claims (2)

[Claims] (1) It has a means for forming droplets at a constant frequency and a means for preventing the formation of the droplets according to recorded information, at least one of the two means is composed of an electrostrictive vibrator, and A non-injection recording device characterized in that the volume of a chamber or a liquid flow path is changed and formed droplets are used for recording. (2) It has means for forming a droplet at a constant frequency and means for preventing the formation of the droplet according to recorded information, at least one of the means is configured with a magnetostrictive vibrator, and a liquid chamber is provided. Alternatively, a non-innocuous recording device characterized in that the volume of the liquid flow path is changed and the formed droplets are used for recording.