JPS62148270A - Recorder - Google Patents

Abstract

PURPOSE:To contrive prevention of fogging and an enhancement of resolution, by providing a shield electrode for prohibiting leakage of electrical signals between each adjacent pair of a plurality of recording electrodes from which the electrical signals are outputted. CONSTITUTION:A signal voltage outputted to a corresponding second individual electrode 34 by irradiating a photoconductive film 35 with light is securely shielded by a voltage of opposite polarity which is impressed on shield electrodes 36..., so that the signal voltage is prevented from leaking to the adjacent second individual electrode 34. Though a signal voltage of positive polarity is outputted to the tip side of the second individual electrode 34... through an upper common electrode when the film 35 is not irradiated with light, the signal voltage will not leak to the other ones of the second individual electrodes 34... because both sides of each of the second individual electrodes 34... are maintained at a negative potential by the function of the shield electrodes 36.... Accordingly, the prevention of fogging and the enhancement of resolution can be contrived.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an inkjet type recording device applied to, for example, printers, facsimile machines, and the like.

[Conventional technology]

Inkjet recording devices have traditionally been used in printers and facsimiles as a plain paper recording method that does not require developing or fixing operations, but electronic flat scanning is desired to improve high-speed recording and simplicity. It is rare.

Converting this inkjet recording device to electronic plane scanning has been studied mainly by using multiple nozzles, but this has not been put into practical use due to the problem of reduced reliability due to clogging of ink in each recording nozzle. is the current situation.

Therefore, the following slit jet type recording apparatus has been proposed prior to the present invention as a plane scanning inkjet type recording apparatus that does not have the disadvantages of the nozzle type.

That is, 1 in FIGS. 4 and 5 is a recording head, which is composed of a lower recording head section 2 and an upper recording head section 3. In FIG.

The lower recording head section 2 has a lower common electrode 5 on an insulating lower substrate (lower base) 4, and is made of a material such as Or or N1 and has 8 electrodes/mm or 16 electrodes/mm. A plurality of first individual electrodes (first recording electrodes) 6 are patterned and electrically connected to the lower common electrode 5, and a gap d3 is formed between the first individual electrodes 6 and the like. A film is formed in the gap d3 between the second individual electrode 7 and the first individual electrode 6, which face each other in a one-on-one manner. For example, the photoelectric conversion member 8 includes a photoconductor film made of amorphous silicon (hereinafter referred to as a-8i) or amorphous selenium (hereinafter referred to as a-8e).

The upper recording head section 3 is mounted on an insulating upper substrate [1] facing the lower substrate 4 with a gap d2 maintained therebetween.
The upper common electrode 10 is disposed on the substrate 111 (substrate 111) 9 and faces the second individual electrodes 7 with a small gap therebetween.

Further, a slit-shaped opening 1 having a gap d2 formed by the lower substrate 4 and the upper substrate 9 is formed at the tip of the recording head 1, and the liquid ink supplied from the ink storage section 12 can be stored therein. 13 forms an ink meniscus 14.

Further, a roller-shaped back electrode 15 is provided so as to face the tip of the recording head 1 with a gap d1 in between, and a recording medium 16 such as plain paper is supported on this back N pole 15.

A document table 17 is provided above the recording head 1 and operates in synchronization with the recording medium 16. A focusing fiber lens array 18 and a halogen lamp are provided between the document table 17 and the recording head 1. An exposure system consisting of an exposure light source 19 is provided.

By operating the switch, the document table 17 and the recording medium 16 operate in synchronization, and one light source is turned on, and the optical image of the document on the document table 17 is irradiated onto the photoconductor film 8 through the fiber lens array 18. be done.

For example, the negative electrode of a DC power source 20 is connected to the lower common electrode 5, and the positive electrode of a DC power source 21 is connected to the upper common electrode 10.
. . , a negative potential is output to the tip of the recording head 1, and a positive potential is output to the dark area.

The principle of the high signal strength can be explained using the equivalent circuit shown in FIG. That is, the resistance of the photoconductor film 8 when irradiated with light is ρphoto, the resistance when N is ρdark, and the dark ink 13 between the upper common electrode 10 and the second individual electrode 7 is
If the resistance of is ρink, then ρphoto < ρin
Ink 1 so that the relationship k < p dark holds true.
By adjusting the resistor ρ1nklFfT− of 3, ρink becomes dominant during light irradiation, and the first DC N source 20 outputs a negative potential to the tips of the second individual electrodes 7. Sometimes ρdark becomes dominant and the second
The DC power supply 21 outputs a positive potential.

Next, the back electrode 15 is powered by a third DC power supply 22.
When a pulsed voltage is applied to the negative polarity side with respect to v and a positive potential is output to the tip of the second individual electrode A, a positive charge is injected into the ink meniscus 14. , the ink 13 flies toward the back electrode 15, so that selective recording corresponding to the original image is performed on the recording medium 16.

Note that it has been confirmed that sufficiently good recording by flying ink 13 is possible under the process setting conditions shown below.

That is, the voltage applied to the lower common electrode 5 is -50V to -I
KV, the voltage applied to the upper common electrode 10 is O to +IKV, the voltage applied to the back electrode 15 is 0 to -2.0 KV, the back electrode 1
5 frequency is 1082-10 kHz, gap d1
is 10 μm to 500 μm, and gap d2 is 10 μm to 3
00 μm.

Further, the value of the gap d3 varies depending on the specific resistance of the photoconductor III 8, but if the photoconductor film 8 is
In the case of ll, it is 20μTL to 80μm, and in the case of a-8e or a-8eTe film, it is 5μTrL to 50μm.

Further, when the photoconductor film 8 is, for example, a-3elJ, ρdark is 109 to 10120 cm1. o ph
Since ot is 105 to 106 Ωcm, the resistance ρink of the ink 13 must be selected to be 10'' to 1010 Ωcm.

Roughly speaking, the dark portion of the light image irradiated onto the photoconductor film 8 is 50Lux to 500LIJX.

[Problems to be Solved by the Invention] However, the above-mentioned slit jet recording apparatus has the following drawbacks.

That is, the resistance ρink of the ink 13 is 106 to 107.
If it is as low as Ωcm, as shown in FIG.・・・
There is a problem in that the iE polarity signal voltage (electrical signal) leaks at the tip of the ink, causing the ink 13 to fly and causing so-called fogging.

Also, the resistance ρink of the ink 13 is 1 oll ~ 109
When it is as high as Ωcm, as shown in Fig. 8 δ and Fig. 9,
Originally, the tip of the second individual electrode 77 that is closest to the tip C of the second individual electrode 7 to which the signal ``command'' should be output, D
and the tips of the next adjacent second individual electrodes 7.7 GE, E
However, there is a problem in that the signal voltage leaks to some extent, and ink flies from the leaked area, resulting in poor resolution.

The present invention has been made based on the above-mentioned circumstances, and its purpose is to prevent leakage of electrical signals from a recording electrode outputting an electrical signal to an adjacent recording electrode; Therefore, it is an object of the present invention to provide a recording device that can prevent the occurrence of 7S cursions and improve resolution.

Means for Solving Problem C] In order to solve the above problem, the present invention provides one node of the electric signal between each of a plurality of recording electrodes from which the electric signal is selectively output. This feature is characterized by the provision of a shield electrode for blocking.

(Function) The electrical signal output to the recording electrode is shielded by the shield electrodes on both sides of the recording electrode, thereby preventing leakage of the electrical signal to the adjacent recording electrode.

(Example) Hereinafter, an example of the present invention will be described with reference to the first blade to FIG. 3. Incidentally, in this actual example, only the configuration of the lower recording head section 2 is different from the recording apparatus shown in FIGS. Only the second configuration will be explained.

31 in FIGS. 1 and 2 is an insulating lower substrate (lower base), and on this lower substrate 31 is a lower common electrode 3.
2 and a plurality of first individual electrodes (first recording electrode) 33... and the rear end is the first individual electrode 3
A second individual electrode 34 facing one-to-one with a gap da (see Fig. 3) and the rear end of the second individual electrode 34 and the second individual electrode 34 facing each other with a gap da (see Fig. 3) For example, amorphous silicon (hereinafter referred to as a-8i) is formed in the gap d3 between the tips of the first individual electrodes 33....

) or amorphous selenium (hereinafter referred to as 3a-8e)
etc., and each of the plurality of second individual electrodes 34, and a second
A shield electrode 36 that prevents leakage of the signal voltage (electrical signal) output to the individual electrodes 34 of the shield electrode 36 and a common electrode for shield electrodes 37 to which the shield electrode 36 is connected are provided. It is being A voltage of the same polarity, for example, a voltage of negative polarity, is applied to the lower common electrode 32 by a power supply 38 and to the shield electrode common electrode 37 by three power supplies.

Further, as shown in FIG. 3, the first individual electrodes 33 and
An insulating material 40 is interposed between the front end sides of the second individual electrodes 34 and the rear ends of the shield electrodes 36. That is, the lower substrate 3
1, an insulating material 40 is provided to cover the rear end side of the shield electrode 36, and on the insulating material 40, the tip end side of the first individual electrode 33... and the second individual The rear end side of the electrode 34... is provided, and a photoconductor film 35 is further provided in the gap 3 portion, and the first individual electrode 33... and the shield electrode 36... are three-dimensionally intersected. It is designed to prevent electrical contact.

According to the above configuration, the signal voltage (electrical signal) output to the corresponding second individual electrode 34 when the photoconductive film 35 is irradiated with light is applied to the shield electrode 36. Since it is always shielded by a voltage of opposite polarity, leakage to the adjacent second individual electrode 34 does not occur.

Further, when the photoconductive 135 is not irradiated with light, the second
A signal voltage of positive polarity is outputted to the tips of the individual electrodes 34 for winter 2 through the upper common electrode 21, but a signal voltage of negative polarity is output on both sides of the individual electrodes 34 for winter 2 by the shield electrodes 36. Therefore, the positive signal voltage does not leak to another second individual electrode 34 .

Therefore, the second individual electrode 3 to which the signal voltage is output
Since leakage of the signal voltage from the ink 4 to the adjacent second individual electrode 34 can be prevented, the ink 1
Even if the resistance value of the ink 3 is low, fogging does not occur, and even if the resistance value of the ink 13 is high, the resolution does not deteriorate.

Although the shield electrode 36 is applied with a voltage of opposite polarity to the output signal voltage of the second individual electrode 34 in the above-mentioned actual M example, the shield electrode 36 is not limited to this, and may be grounded. good.

(Experimental Example) A photoencrusting process (P) was applied on the lower substrate 31 made of glass such as Corning 7059.

First, the shield electrodes 36... and three common electrodes for shield electrodes were patterned using the following methods.

Then, an insulating material 40 with a thickness of about 1 μm was formed on the upper surface of the rear end portion of the shield electrodes 36 . As the insulating material 40, amorphous nitride gI (a~SiN:H film) formed by glow discharge of SiH4 gas and N2 gas was used.

Then, the lower common electrode 32, the first individual electrode 33..., and the second individual electrode 34... are formed on the lower substrate 31 and the insulating material 40 by P, E, P processing again. patterned.

Next, the first individual electrode 33... and the second individual electrode 3
4...A photoconductive film 35 made of an a-3*;H film was formed on which part of the gear rough 63. This a-8l: H
The film was formed by the usual glow discharge decomposition method of SiH+ gas.

The lower recording head section 2 created in this way is inserted into the slit-jet type recording apparatus, and first, it is exposed to a predetermined second individual electrode 34 of the photoconductive panel 35 using an LED light source (not shown). When a portion was intermittently irradiated with light and other portions were exposed entirely to light, the ink 13 was selectively ejected only to the tip of the second individual electrode 34 that was irradiated with light.

Then, when the LED light source was replaced with one halogen lamp exposure light source and the SELFOC lens 18, and the document table 17 was moved to perform copying, a copy image with good resolution was obtained.

The process conditions for the experiment were as follows: -100 V for the voltage applied to the lower common electrode 32 for signal voltage output, -100 V for the voltage applied to the common electrode 37 for shield electrode, and -100 V for the voltage applied to the upper common electrode 0. The DC pulse voltage applied to the back roller 15 is -700V, the frequency is 1KH1, the gap d1 is 1100Lt, and the DC pulse voltage applied to the back roller 15 is +250V.
The resistance of the ink 13 is 10"0cm. The resistance of the ink 13 is 100 μm.

a-3i: The resistance of Hl is p pho℃o = 106Ωc
m<LED 10 Lux irradiation) , , c+d
ark=1010 ΩCm.

〔Effect of the invention〕

As explained above, according to the present invention, since the shield electrode is provided between each of the plurality of recording electrodes from which electrical signals are selectively output, it is possible to The excellent effect of the cap is that it can prevent leakage of electrical signals from the recording electrode l\, thereby preventing fogging and improving resolution regardless of the resistance value of the ink.

[Brief explanation of drawings]

Figures 1 to 3 show one embodiment of the present invention.
The figure is a schematic plan view showing the main part, Fig. 2 is a schematic plan view showing the main part enlarged, Fig. 3 is a sectional view showing the main part, and Figs. 4 to 9 are prior to the present invention. Figure 4 shows the inkjet recording device proposed as a
FIG. 5 is a plan view showing the lower recording head section, FIG. 6 is an equivalent circuit diagram for explaining the principle of selectively ejecting ink, and FIGS. 7 to 9 are It is an action explanatory diagram. 1... Recording head, 2... Lower recording head section, 3.
...Upper recording head section, 9...Upper substrate (upper substrate)
, 10... upper common electrode, 11... opening, 13...
... ink, 15 ... back electrode, 16 ... recording body,
31...lower substrate), 32...lower common electrode, 33...first recording electrode (first individual electrode),
34... second recording electrode (second individual electrode), 35...
... Photoelectric conversion member (photoconductor film), 36... Shield electrode. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 2 Figure 3 Figure 5 Figure 6 Procedural amendments Showa 6+=1 June 11th Director General of the Patent Office Michibu Uga 1, Indication of the case Patent Application No. 60-290202 2, Name of Invention Recording Device 3, Relationship with the case of the person making the amendment Patent applicant (30?) Toshiba Corporation 1 Agent 5 Spontaneous amendment 7, Contents of the amendment (1) Details J"a-Se film" written on page 8, line 15 of the book is corrected to "1-8i film." (2) “10” written on page 8, line 16 of the specification is replaced with “1”
0” and corrected.

Claims (6)

[Claims] (1) A recording head having a slit-shaped opening formed by a minute gap at the tip and a plurality of recording electrodes provided in the opening, and a back electrode facing the tip of the recording head, and the back surface. A recording body is interposed between the electrode and the recording head, and liquid ink is supplied to the opening, and in this state, an electrical signal is output to the recording electrode, so that the recording is performed in response to the electrical signal. Information is recorded by ejecting ink from electrodes onto the recording medium, characterized in that a shield electrode is provided between each of the plurality of recording electrodes to prevent leakage of the electrical signal. recording device. (2) The recording device according to claim 1, wherein the shield electrode is grounded. (3) The recording device according to claim 1, wherein the shield electrode is configured to be applied with a voltage having a polarity opposite to that of the electric signal output to the recording electrode. (4) A lower common electrode, a plurality of first recording electrodes electrically connected to the lower common electrode, and a predetermined minute gap between the first recording electrode and the insulating lower common electrode. and a photoelectric conversion member formed in a predetermined gap between the second recording electrode and the first recording electrode. an upper recording head section having an upper common electrode on an insulating upper substrate facing the lower substrate with a minute gap therebetween, and an upper common electrode facing the second recording electrode with a minute gap therebetween; and a back electrode facing the tip of the lower recording head section, a recording body being interposed between the back electrode and the lower recording head section, and a recording body being interposed between the lower recording head section and the upper recording head section. By supplying liquid ink to the minute gap between the two and inputting an optical image signal to the photoelectric conversion member in this state, electricity is applied to the second recording electrode of the lower recording head section in response to the optical image signal. In the apparatus for recording information by outputting a signal and causing ink to fly from the tip of the second recording electrode onto the recording body, there is a space between each of the plurality of second recording electrodes. A recording device comprising a shield electrode for preventing leakage of the electric signal. (5) The recording device according to claim 4, wherein the shield electrode is grounded. (6) A patent claim characterized in that the shield electrode is configured to be applied with a voltage of opposite polarity to the electrical signal output to the second recording electrode in response to the optical image signal input to the photoelectric conversion member. 4. The recording device according to item 4.