JPS5915956A - Electrostatic latent image developing device - Google Patents

Abstract

PURPOSE:To use a developer having high developing efficiency and comparatively high density, by providing a temperature detecting means and a viscosity detecting means of a developer, and providing a means for detecting and controlling the toner density in the developer. CONSTITUTION:When a rotating member 11 is rotated at a constant speed by a motor 13, rotation torque increases as the viscosity of a developer increases, a current flowing to the motor 13 also increases, and the viscosity of the developer can also be measured by measuring the current. When the viscosity of a developer is measured by a viscosimeter 6 and temperature is measured by a thermister 5, its detected signal is inputted to a controller 14, and is compared with a reference value. When the viscosity at a temperature of the developer in that case is smaller than the reference value, a solenoid valve 15 is opened for a constant interval of time, and a toner 17 is supplied into a developer tank 1 by a fixed quantity. On the contrary, when the measured viscosity is larger than the reference value, a solenoid valve 18 is opened for a constant interval of time, and a diluting solution, namely, a liquid 20 having the same quality as a solvent in the developer is supplied into the developer tank 1 by a fixed quantity.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an electrostatic latent image formed on the surface of a latent image carrier such as a photoreceptor or dielectric by electrophotography or electrostatic recording method, using toner in a solvent. Apparatus for developing with a dispersed liquid developer, especially the toner concentration in the developer, i.e.
#, relates to a developing device equipped with means for detecting and controlling yield.

To keep the density of the portrait image constant, one batch of developer is used.
It is advisable to always wear one pair. For this reason, in the past, as described in Japanese Patent Publication No. 41-21.435, Japanese Unexamined Patent Publication No. 54-62838, etc., light from a light source is transmitted into the current commercial liquid. This transmitted light is received by the photoelectric system, and the liquid yield rate is determined based on the amount of received light from the reference value, and toner is replenished into the developer so that the amount of received light matches the reference value. The conventional choice of concentration F1.1 to 1.5% is often not used, but if the concentration is higher than that of liquid concentration, the latent image electric reaction can also be controlled. However, in the conventional photoelectric developer concentration detection method, when the toner concentration in the developer reaches 3% or more, the transmission is reduced. The ratio of light rays is less than 0%, and toner often forms a layer on the detection area.
It becomes difficult to measure the square, and it becomes impossible to measure the square correctly.

In addition, although the developed image density is relatively easily influenced by the temperature of the liquid, in the conventional method, (
There is no compensation for the IA scandal. ? For example, ti
, when the yield is 3-4% and the liquid temperature changes in the range of 25-35℃, Ll! of 15-20 degrees! 11 I&M degree change. Therefore, even if the quasi-degree is the same in winter and in winter, the image a degree will be the same.

An object of the present invention is to provide an electrostatic capacitor equipped with an improved detection means capable of correctly detecting and controlling the liquid concentration even when using several rim liquids with good development efficiency and relatively high acupuncture strength. An object of the present invention is to provide a latent image developing device.

A further object of the present invention is to provide a self-reflection embroidery image development apparatus which uses temperature changes as a measurement target and compensates for changes in image yield due to temperature changes.

The developing device according to the present invention includes a means for detecting the temperature of the developing solution and a means for detecting the viscosity of the developing solution, and has a preferable developing surface 1! i? The reference viscosity at a certain solution temperature of a developing solution with a certain liquid fertility that results in e degree, and the lli! at a solution temperature that cannot be detected. Comparing with lI electric viscosity, when the measured rectangular viscosity is smaller than the standard viscosity, the toner is supplied into the developer and the final liquid concentration is 1. When the measured rectangular viscosity is thicker than the standard viscosity. In this method, a diluent solution, that is, a solution of the same quality as the solvent used in the process is added to the developer solution, and the developer solution m1 temperature is lowered by 1 degree.

The present invention will now be described in more detail with reference to the accompanying drawings.

I hit S. I sea urchin, glare 1 pulse II! The JI concentration depends on the ratio of toner in the developer, that is, the concentration of the developer.
The flow velocity of toner particles is also a big factor in that song! No matter how bad the liquid concentration is, the toner will be depleted by development, so it will take 7' to replenish the toner.
The toner density of the area where the animal is being disciplined becomes m4, and the density of the image of the butt also decreases. The flow rate of this toner particle is inversely proportional to the viscosity of the developer.

That is, if the viscosity of the developer is high, the particle velocity will be low, and vice versa, the particle velocity will be high. Also, if the liquid temperature is constant, the liquid viscosity is l ftt
Since the surface is changed using the ji function, the result is that the degree of enjoyment of the painting is
It is expressed as a function of liquid viscosity. Diagram O.1 shows this kind of relationship.

Do not know that the viscosity of #C, 12I decreases as the temperature rises. Therefore, if the solution concentration is the same, the viscosity of the developer will also increase to 1 as the temperature increases.
The flow rate of the toner increases as a result of removing the ash and kneading it, so the image of the toner becomes as high as possible. Figure 2 shows such a relationship, and the valley values show different values for different liquid concentrations. therefore.

The value of the viscosity of a certain developer solution at a certain solution temperature that will result in a desirable development surface 11 density is determined in advance experimentally. By setting J1 as a reference value and comparing this reference value with the viscosity value of the actual liquid to be defined at that temperature, it is possible to know whether the concentration of the developer is high or low. can. For example, in Fig. 2, if the liquid viscosity at a liquid temperature of 20°C is Xo value, then the actual measured development If the temperature of the liquid is 20°C and the viscosity at the end is Xl, which is smaller than the standard value XO, it can be determined that the WL yield concentration is lower than the standard liquid concentration of 5%, and By knowing the difference between 1 and 2, how much toner should be replenished into the liquid? It was found that it was possible to return to 5%, and by kneading the desired image density value of 1.2,
I can do that. In addition, if the liquid content exceeds 5%, special measures must be taken to clean the particle carrier and the glare device. It becomes irrelevant.

It is best to measure the temperature and viscosity of the retaining liquid so that the results can be taken out immediately as electrical signals.For example, it is preferable to use a temperature sensor such as a thermistor to measure the temperature, and use a rotational viscometer or a pulse viscometer to measure the viscosity. It is preferable to use a type of viscometer that detects the longitudinal transmission of a vibrating element in the liquid caused by a signal, amplifies and rectifies it, and adjusts the pulse repetition frequency so that the rectified voltage becomes a constant value. Also, based on the comparison between the standard value and the measured value, < t
The iilJ@l command, etc. can be executed by using a microcomputer.

In the third section, an embodiment of the present invention is schematically shown. The developer tank 1 contains a certain concentration of developer 1 and 2. The developer 2 is not pumped up through the liquid supply pipe 4 by the solution supply pop 3, but is pumped up by the thermistor 5 on the way. After temperature measurement and viscosity measurement using a rotational viscometer 6, the developer is pumped onto a developer tray 7, where the electrostatic latent image on the surface of the photoreceptor drum 8 is developed, and then the developer is passed through a gutter 9 to a developer tank. It is returned to 1.

The rotational viscometer 6 comprises a cylinder [10] with an upper outlet 10a and a lower outlet 10b for the developer and this cylindrical tank l.
It consists of a cylindrical rotating member 11 that rotates at regular intervals on the inner wall surface of O, and a DC motor 13 that is directly connected to the upper part of this rotating member 11 via a shaft 12. The depth of the cylindrical tank 10 may be made lower, the rotating member 11 may be made into a disk shape, and the motor 13 may be a synchronous motor. Motor 1
When the rotating member [l] is rotated at a constant speed by 3, as shown in Fig. 4, the rotational load, that is, the rotational torque increases as the viscosity of the developer increases, and the current flowing to the motor 13 due to kneading also increases. To increase. Therefore, motor 13
The viscosity of the developer can also be measured by measuring the magnitude of the current flowing through the sample. (b) Such a rolling viscometer has a simple structure and can be used with a general small motor, so it is inexpensive.

In this way, the viscosity of the surrounding liquid is measured by the viscometer 6,
If the temperature of the developer is not measured by the thermistor 5,
The detection signal is input to the controller 14, where it is compared with a reference value that has been input in advance. As shown in the figure, it is determined that the liquid visibility has decreased, as shown in the figure.
is opened for a certain period of time -C, and a certain amount of toner in the toner tank 16 is replenished into the liquid storage tank 1. On the other hand, if the measured viscosity is higher than the standard value, the liquid concentration is too high! 1
．． 11, the solenoid valve 18 is opened when the force is constant according to a signal from the controller 14, and the diluted liquid in the diluted liquid tank 19, that is, the developer, is poured into the diluted liquid at the same time. A certain amount of solution 20 of the same quality as the bath agent in developer tank 1
It will be provided within 1.8 days. The toner or diluted liquid in the developer tank 1 and the retaining liquid 2 are circulated in the tank by an agitation pot 21 and a circulating/< Eve 22,
During that time, the liquid concentration of 9t IM was stirred and mixed.
? The liquid is sucked up again into the liquid supply pot 3 as water and is applied to the developing process.

In this way, according to this invention, the liquid concentration is 1.5 to 5.
Since it is possible to perform reliable image density control even when using a relatively high % developer, it is possible to provide a compact developing device with good development efficiency. In particular, the liquid concentration range of 3 to 5 cm, which cannot be measured using conventional photoelectric detection methods, is
As shown in the figure, since it does not affect image density changes and has little effect, relatively dull control is sufficient, and the error in measured viscosity is 1 to 5%.
Even if there is a certain degree, the influence on image density cannot be suppressed to about 2 to 7%. The liquid concentration range of 1 to 1.5%, which is commonly used in the past, has a large effect on image density, and strict control is required accordingly. In addition, in this invention, since the temperature of the developing solution is also included in the measurement target, it is possible to compensate for image density due to temperature changes, and even when the room temperature changes in the range of 5 to 40 degrees in winter and summer. Also, the image corresponding to Kotoga 1 can be controlled once.

[Brief explanation of the drawing]

Figure 1 shows the image density for detailed explanation of this invention.
Figure 12, a diagram showing the correlation between liquid temperature and liquid viscosity, is
Figure A-3 is a diagram showing an embodiment of the present invention, and Figure A-4 is a diagram showing the correlation between liquid temperature and liquid viscosity. FIG. 3 is a diagram showing the correlation between current, rotational torque, and viscosity in the rotational viscometer of the example shown in FIG.

Claims (1)

[Scope of Claims] 1a In an apparatus for developing an electrostatic latent image formed on an image carrier using a liquid developer in which toner is dispersed in a solvent, means for detecting the temperature of the developer; , means for detecting the viscosity of the developer solution;
What is the viscosity of the liquid at a certain temperature, and what is the viscosity at the temperature of the liquid detected by both of the detection means? When the latter is smaller than the former, the toner is supplied into the liquid, and when the latter is thicker than the former, the toner is supplied into the developer to be mixed with the liquid. An electrostatic device including means for generating a signal. 2. The means for detecting the viscosity of the 1st part of the developer is directly connected to the cylindrical part through which the developer 1' rolls and flows out by maintaining a distance of one foot from the inner wall surface of the circular part 1st part. It is equipped with a cylindrical or disc-shaped rotating member rotated by a twisted DC motor or a synchronous motor, and the rotational torque of the rotating member changes depending on the viscosity change of the developer, and the current flows through the pre-motor due to the kneading. An electrostatic latent image developing device according to claim 1, which utilizes the change in the electrostatic latent image developing device.