JPS62253464A - Image recorder - Google Patents

Abstract

PURPOSE:To enable image quality to be controlled through arbitrarily changing the size of each picture element, by providing a second electrode group on both sides of a first electrode group to control an electric field directed toward a donor member. CONSTITUTION:A recording electrode group 12 comprises a first electrode group 15 consisting of a plurality of recording electrodes 14 arranged in a straight line at intervals, a second electrode groups 17 consisting of a pair of plate form electrodes 16, 16 disposed on opposite sides of the first electrode group 15, and a main body 18 formed on an insulating resin and supporting the electrode groups. With a signal voltage applied, the electric fields 20 of the recording electrode 14 in the vicinity of the second electrode group 17 are directed toward the plate form electrodes 16, 16, while only the electric field 21 beneath a central part of the electrode 14 is directed toward a donor member 10, and colored particles 11 are adhered to a recording member 13 over substantially the same area as the cross sectional area of the electrode 14. The size of each picture element 22 can be varied by controlling the potential difference between the second electrode group 17 and the donor member 10.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an image recording device that records electrical signals input in accordance with image information as a visible image on a recording member, specifically, an image recording device that records an electrical signal input in accordance with image information as a visible image on a recording member. The present invention relates to an image recording device layer that transfers colored particles onto a recording member in response to an input electrical signal to obtain a visible image.

BACKGROUND OF THE INVENTION Devices for recording image information as a visible image on an FC storm signal recording member are well known.

For example, as shown in FIG. 4, a stylus electrode, in which a plurality of recording electrodes 3 are linearly arranged at intervals, is connected to a main body 4 made of an insulating resin, facing a donor member 2 holding colored particles 1. A recording member 6 is placed in contact with the recording electrode group 5, and a plurality of electrical signals input according to the image information are recorded on some of the poles 3. A so-called CONTROG 2 fee is known in which colored particles 1 are transferred and attached to a recording member 6 by an electric field formed from a recording electrode 3 toward a donor member 2 by applying a signal as a voltage.

In addition, when the colored particles 1 are insulating, they are transferred to the recording member 6 by the attraction force according to the electric field due to the electric charge they have in advance due to the W11 abrasion, and when the colored particles 1 are 2Xffj, they are induced by the electric field. The injected charge transfers to the recording member 6 under an attractive force according to the electric field.

Problems to be Solved by the Invention In such a device, the electric field is formed in a state where it spreads from the recording electrode 3 toward the donor member 1. Therefore, the colored particles 1 are spread over an area wider than the tip area of the recording polarization 3. is attached,
The pixels printed on the recording member 1 are larger than the recording electrodes 3, and the size of the pixels is determined by the size of the recording electrodes 3 and cannot be changed.

For this reason, it is not possible to arbitrarily adjust the image quality by setting the size of each pixel of the recorded image to an arbitrary size, and it is also difficult to adjust the image quality between the recording device and a device that supplies image information such as a word processor or a personal computer (hereinafter referred to as a host device). compatibility becomes worse.

In other words, in order to be compatible with a large number of host machines, the printing density of the image recording device, that is, the number of recording electrodes per unit length, must be the same as that of the host machine that supplies the highest density of image information.
! In order to obtain high-quality printed images, it is desirable to have as high a density as possible, but if a high-density image recording device is connected to a host machine that supplies low-density image information, Not only does it require image processing that corresponds to the difference in density, but the recording speed also differs due to the difference in density, that is, the number of printed dots. The recording speed will also be slower.

For example, on the host machine, image information sound 1 with a density of 8 dots/
When recording with a 6-dot/rILm image recording device to obtain a hard copy, if only individual dots are printed, the thinned out dot positions will be missed and the image quality will be poor. Since one dot is converted into two dots by the image recording device IT for printing, the conversion takes time and the recording speed becomes slow.

Note that the above-mentioned problem can be avoided by making the printing speed of a high-density image recording device sufficiently fast, but since the time for recording all of each pixel is constant regardless of the density, high-density image recording devices with a large number of recording electrodes It is difficult to increase the printing speed # of an image recording device.

Means to solve all the problems and operation recording electrodes are arranged in a straight line and a second electrode group is provided on both sides of the first electrode group to record! As a group of poles, it is possible to control the size of pixels on the recording member.

EXAMPLE Colored particles 11 are held on the donor member 10, and the recording member 13 is arranged so as to be in contact with the recording electrode n+2 and not to be in contact with the colored particles 11 on the donor member IO.

The recording electrode #12 includes a first electrode group 15 in which a plurality of recording electrodes 14 are arranged in a straight line at intervals, and a first electrode group 15 that is close to and parallel to both sides of the first t-pole group 15. A second electrode group 17 consisting of a pair of plate-shaped electrodes 16 and 16 arranged to sandwich the electrode group 15 is held by a main body 16 made of insulating resin. Each of the recording electrodes 14 constituting the recording electrode 14 is connected to a controller 19 so that a signal (voltage) is applied in response to an electrical signal input in accordance with image information.

A pair of plate-like Ts constituting the second electrode group 17;
I 6 , I 6 and donor member 10 are grounded and 1 m apart.
When a signal voltage is applied to the recording electrode 14 according to the fc electric signal input to the controller 19 according to the image information, the voltage between the recording electrode 14 and the donor member 10 increases. An electric field is generated at , but the electric field 20 near the second electrode group 17 of the recording electrode 14 is directed toward the pair of plate electrodes 16 , 16 , and the electric field 21 directly below the center of the recording electrode 14 is directed toward the donor member 10 . In the end, the electric field 21 directed toward the donor member 10 is constricted and reaches the recording section! Since the colored particles 11 reach the donor member 10 with approximately the same area as the area 14, the colored particles 11 record it! [14], and the recorded pixel 22 has approximately the same size as the recording KM14.

Further, when a potential difference is given between the second electrode group 17 and the donor member 10 by applying a positive voltage to the second electrode group 17 or a negative voltage to the donor member 10, the recording electrode 14 The electric field towards the second electrode group 17 decreases and the electric field towards the donor member 10 increases, and the pixels 22 recorded on the recording member 13 become larger than the recording electrodes 14.

In other words, the size of the pixel 22 increases in proportion to the potential difference between the second fllt electrode group 17 and the donor member 10.

Because of this, the image quality can be adjusted arbitrarily by changing the size of the pixel 22, and when recording by connecting to a host device with a lower density than the density of the image device, the difference in density can be adjusted. By setting the potential difference between the second electrode group 17 and the donor member 10 accordingly and determining the size of the pixel, it is possible to record without degrading the image quality or slowing down the recording speed.

For example, as shown in FIG.
When recording by connecting to a host machine that supplies image information with dot/frame density, the controller 19 applies a signal voltage to every other recording electrode: 4 to perform recording. If the above-mentioned potential difference is set so that the pixel 22 is twice the normal size, the pixel 22 is twice as large as the normal size. 22 is formed and the image quality is not degraded, and the image recording device 2 dots and the host machine 23 are not formed as in the past.
Since there is no need to perform image processing to make the dot correspond to the 01 dot, the recording speed does not slow down.

That is, means for adjusting the potential difference between the second electrode group 17 and the donor member 10, for example, a mechanism for varying the voltage applied to the @2 electric fi group 17 according to the density of input image information, Donor member 1 according to the density of large image information
By providing a mechanism that varies the voltage applied to zero, high-speed recording is possible without deteriorating image quality even when connected to a low-density host machine.

Next, a specific example will be explained.

In the image recording apparatus shown in FIG. 1, the recording electrodes 14 are made of Ni Bic wires with a diameter of 50 μm and are arranged in a straight line at a pitch of 62.5 μm to form a first electrode group 15.
A pair of thick copper electrodes were used as the second electrode group 12.A mirror-finished aluminum plate was used. is used as a donor member 10, on which a conductive toner of 101 to 101 Ωam is sprinkled as colored particles 11 to a thickness of several tens of μm, and a recording electrode 14 is fixed at a distance of 200 μm from the donor member 10,
Plain paper for PPC is used as the recording member 13, and the donor member 10 and the recording member 13 are moved in the same direction at a constant speed, and the recording electrode 14 is grounded when not recording and +3 when recording.
A Hyytzac pulse voltage of 0 or was applied.

Under the above conditions, the donor member 10 is grounded, the second
When an image was formed by grounding the electrode group 17 of the recording member 1,
The size of the pixel 22 on No. 3 was approximately 80 μmφ.

Under similar conditions, the donor member 10 is grounded, and the second electrical connection 617
When a voltage of 100 r was applied to form an image, the size of the pixel 22 on the recording member 13 was approximately 150 μm and φ.

Under the same conditions, a voltage of -10 or is applied to the donor member 10, and the electrode group 17ft of gg2 is grounded to form an image.Then, the size of the pixel 22 on the recording member 13 is approximately 150 μmφ.
It became.

From the above, when printing at a pixel density of 16 dots/rnm, the second electrode group 17 and the donor member 10 are grounded, and when printing at g dots/rnm, the second electrode group 17 and donor member 10 are grounded. pole group 1
7 or apply a voltage of about 100 V to the donor member 10 to double the size of the pixel 22 and double the feeding speed of the recording member 13. It becomes possible to perform each recording at the optimum speed by changing the size of the pixels to be printed in accordance with the pixel density.

In the above embodiment, @2 electrode #17? Although it is constructed of a pair of plate-like 1pL poles 16, 16, the plate-like single pole may be divided into a plurality of parts, or each recording electrode 14 may be provided independently.

Effects of the Invention By applying a potential difference between the second electrode group 17 and the donor member 10, the size of the pixel 22 printed on the recording member 13 can be changed, so the size of the pixel 22 can be changed arbitrarily. The image quality can be adjusted arbitrarily, and even when low-density image information is input, it can be recorded without degrading the image quality or slowing down the recording speed.

[Brief explanation of drawings]

The drawings show embodiments of the present invention, and FIG. 1 is an overall explanatory diagram, and f
FIG. g2 is a perspective view of the recording chamber fi@ group, FIG. 3 is a schematic explanatory diagram of a printing operation, and FIG. 4 is an explanatory diagram of a conventional example. 10 is a donor member, 11 is a colored particle, 12 is a recording electrode group, 13 is a recording member, 15 is a first electrode group, and 17 is 1 of @2! Extreme group.

Claims (1)

[Claims] 1. A donor member 10 holding colored particles 11 on its surface;
A recording electrode group 12 is provided facing the donor member 10 and held in a non-contact manner, and a recording member 14 is disposed in a gap between the recording electrode group 12 and the donor member 10. In an image recording device configured to apply a voltage according to image information to
An image recording apparatus comprising: an electrode group 15 and a second electrode group 17 provided on both sides of the electrode group 15. 2. The image recording apparatus according to claim 1, further comprising means for adjusting the potential difference between the second electrode group 17 and the donor member 10. 3. Image recording according to claim 2, characterized in that the potential difference adjustment means is configured to vary the voltage applied to the second electrode group 17 according to the density of input image information. Device. 4. The image recording apparatus according to claim 2, wherein the potential difference adjustment means is configured to vary the voltage applied to the donor member 10 in accordance with the density of input image information.