JPS61167960A - Color recording device - Google Patents

Abstract

PURPOSE:To perform color recording by mixing >=2 kinds of toner which differ in color by a developing device. CONSTITUTION:A photosensitive drum 21 is charged electrostatically and uniformly by an initial electrostatic charger 22, then the 1st exposure is carried out by using the 1st exposure system 23 such as a laser to form the 1st electrostatic latent image. Then, the 1st developing device 24 performs development using black toner to form black toner image on the photosensitive body, which is uniformed in potential by a recharger 25. The 2nd exposure system 26 is used to perform the 2nd exposure and form the 2nd latent image, which is developed by using toner of a color other than black by the 2nd developing device 27. When a developer obtained by mixing cyan toner and yellow toner is used, a green toner image is formed and the mixing ratio of the cyan toner and yellow toner is varied to vary the color toner of green optionally. Consequently, the variety of color tones is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a color recording device using an electrophotographic process, and particularly to a color recording method that allows arbitrary changes in color tone.

Various printers have been put into practical use for displaying computer output, but in the field of printers,
Recently, there has been a trend toward color printing, and there is a similar demand for electrophotographic recording devices to be colorized as well. Furthermore, in color recording, it is desirable to record in a variety of tones, which will result in even more beautiful recording.

[Prior Art] FIG. 4 shows an outline of a monochrome recording device using an electrophotographic process such as a copying machine or a laser printer.

The photosensitive drum 1 is uniformly charged by an initial charger 2, and then imagewise exposed by an exposure system 3 such as a laser to form a latent image. Thereafter, magnetic brush development is performed using a developer containing a mixture of toner and carrier by the developing device 4, and the toner is attached to the latent image portion of the photoreceptor.

Next, the toner image is transferred onto the recording paper 5 using a transfer device 6, and is thermally fixed by a fixing device 7 to perform permanent recording. Thereafter, the photosensitive drum is neutralized by a static eliminator 8, residual toner is removed by a cleaner 9, and the above steps are repeated again.

FIG. 5 is a diagram showing a contact portion between a developing device and a photoreceptor in a conventionally used two-component magnetic brush developing method. A developing roller 10 in the developing device includes a magnetic roller 11 having a plurality of magnetic poles and a non-magnetic cylindrical sleeve 12. Carrier C, which is magnetic powder
A developer mixed with toner T, which is an insulating non-magnetic powder, is deposited on the sleeve of the developing roller to form developer spikes, and by rotating the magnetic roller 11 or sleeve 12, the developer is transport. The toner T is charged by friction with the carrier C, and adheres to the latent image portion of the photosensitive drum to perform development.

[Problems to be Solved by the Invention] By the way, in a recording apparatus using such an electrophotographic process, by changing the color of the toner T, the color of the recorded image can be changed. For example, when recording black, a developing device containing a developer containing a mixture of black toner and carrier is prepared. Also, when recording red, prepare a developing device containing a developer containing a mixture of red toner and carrier, or replace the developing device with one containing toner of the required color and record each color. ing.

However, there is a problem in that it is not possible to record various colors with various tones. SUMMARY OF THE INVENTION An object of the present invention is to solve such problems and provide a recording apparatus capable of producing color recordings with a wide variety of tones.

[Means for solving the problem] The purpose is achieved by a color recording device that records color by mixing two or more toners of different colors in a developing device, and furthermore, This is accomplished with a color recording device in which the two or more toners have approximately the same rank on the triboelectric series relative to the carrier.

[Function] That is, according to the color recording device according to the present invention, two or more toners of different colors are mixed in a developing device to perform color recording of an arbitrary tone, and the plurality of toners are frictionally charged. Give almost the same ranking in the series. that way,
A color record with the desired tone can be obtained.

[Example] Examples will be described in detail below with reference to nine drawings.

In the present invention, recording is performed using a developer in which cyan, magenta, yellow, black, and other toners are mixed in an arbitrary ratio in a developing device. By controlling it, records of various tones can be obtained. Furthermore, each toner to be mixed is made to have approximately the same amount of charge obtained by friction with the carrier, thereby eliminating variations in the development characteristics of each toner, and performing desired color recording.

FIG. 1 is a diagram showing a contact portion between a developing device and a photoreceptor in the two-component magnetic brush developing method according to the present invention. In the same figure, 10 is a developing roller as in FIG. 5.

11 is a magnetic roller, 12 is a sleeve, and shows a state in which a mixture of magenta and cyan, that is, purple color is developed using a developer in which magenta toner MT and cyan toner CT are mixed together with carrier C. ing. Moreover, by changing the mixing ratio of both toners, it is possible to develop purple in any tone.

Similarly, it is possible to develop various colors by mixing magenta toner and yellow toner, or yellow toner and cyan toner, or by changing the mixing ratio. Moreover, when black toner is added, color expression is further expanded.

FIG. 2 is a diagram showing the triboelectrification series of the carrier and toner used in the present invention. In this way, with respect to the carrier C, the cyan toner CT, magenta toner (2), yellow toner YT, and blank toner BT are arranged to have approximately the same order on the triboelectrification series. In this case, each toner is charged to approximately the same amount of charge due to friction with the carrier, and exhibits similar development characteristics. As a result, faithful color tone development is achieved in accordance with the ratio of the mixed toners. In other words, a desired color tone can be recorded. Incidentally, in order to make the order on the triboelectrification series almost the same, the charge control agent contained in the toner material is controlled. Further, the present invention is not limited to the above-mentioned four colors, and the same applies to toners of other colors.

FIG. 3 is a diagram in which the color recording device of the present invention is applied to a two-color recording device that the present inventors have already proposed. After the photosensitive drum 21 is uniformly charged by the initial charger 22, a first exposure system 23 such as a laser is used to charge the first photosensitive drum 21.
Exposure is performed to form a first latent image. Next, the first developing device 24 performs development with black toner to form a black toner image on the photoreceptor.

Thereafter, the potential on the photoreceptor is made uniform by the recharging device 25. This is to prevent color mixing caused by the second toner adhering to the first toner image portion in the next second developing step. Next, a second exposure is performed using the second exposure system 26 to form a second latent image.

Next, the second developing device 27 performs development using a toner of a color different from black, and the color recording apparatus of the present invention is used for this second development. For example, if a developer containing a mixture of cyan toner and yellow toner is used, a green toner image will be produced. Further, by changing the mixing ratio of cyan toner and yellow toner, the green tone can be changed arbitrarily. By performing this second development, a black toner image and a green toner image of an arbitrary tone are obtained on the photoreceptor.

These two color toner images are transferred onto the recording paper 28 at once,
It is fixed and a two-color record is obtained. 29 is a transcription device.

30 is a fixing device. Further, the photosensitive drum 21
Static eliminator 31. Cleaner 32. Static electricity is removed by the optical static eliminator 33.
It is cleaned and used again and again.

If such two-color recording is performed, for example, two-color recording of black and green of an arbitrary tone can be performed, and the range of color expression is expanded, and color recording of various tones becomes possible.

[Effects of the Invention] As can be seen from the above description, according to the present invention, since a plurality of toners of different colors are mixed in a developing device to perform development,
It has the advantage of being able to provide a wider range of color changes than conventional methods.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the contact portion between the developing device and the photoconductor of the recording device according to the present invention, FIG. 2 is a diagram illustrating the triboelectric charging sequence between the carrier and toner used in the present invention, and FIG. FIG. 4 is a diagram showing an overview of a conventional monochrome recording device; FIG. 5 is a diagram showing a contact portion between a developing device and a photoreceptor in the recording device. It is. In the figure, 1, 21 is a photosensitive drum, 2.22.25 is a charger, 3
, 23.26 is the exposure system, 4.24.27 is the developer, 5
．． 28 is recording paper, 6 and 29 are transfer devices, 7.30 is a fixing device, 8.31.33 is a static eliminator, 9.32 is a cleaner, 10 is a developing roller, 11 is a magnetic roller,
12 is a sleeve, C is a carrier, T is a toner, CT is a cyan toner, MT is a magenta toner, YT is a yellow toner, and BT is a black toner. Figure 1 2rl! J 3rd m 21: Photosensitive V Hum 22: Shooting direction Houki top 123 Nio 1 Dew 1 Kyo Tamenio 1 Rizo volume 25: #畢tl-26: O2. Rokatsu 27 = Sai 2 Parent Image Volume 3. Reporter ■29: Dagoki. , fuser 31: AC [32: 7 leave "33: lt inspection number

Claims (2)

[Claims] (1) A latent image is formed by uniformly charging and imagewise exposing the photoreceptor, toner is attached to the latent image area for development, and the developed toner is transferred onto recording paper for recording. A color recording device characterized in that the recording device performs color recording by mixing two or more toners of different colors in a developing device. (2) The color recording device according to claim 1, wherein the two or more toners of different colors have approximately the same rank with respect to the carrier on a triboelectrification series.