JP2002149021A - Image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming device which can be assembled easily at low cost. SOLUTION: The image forming device provided with an electrophotographic process has a temperature detecting means (thermister) 2 to detect the temperature in the vicinity of the photoreceptor as a temperature compensating means of the electrophotographic process, and a destaticizing means (LED) 3 of the photoreceptor and the temperature detecting means 2 are formed integrally on the same surface of a printed circuit board 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an image forming apparatus such as a copying machine, a printer, a facsimile, and the like.

[0002]

2. Description of the Related Art In an image forming apparatus utilizing an electrophotographic process, variations in temperature characteristics of various process conditions such as a photoreceptor, a charging unit, a developing unit, and a transferring unit affect an image. For example, the photoreceptor forms an electrostatic latent image on the photoreceptor surface due to photoconductivity. Photoconductivity is the property of generating electrons and holes when receiving light, and moving them. This movement of electrons and the like is affected by the temperature. Therefore, the saturation charging potential, sensitivity, and the like of the photoconductor are functions of temperature. In the developing means, the positively or negatively charged toner is developed by an electric field between the photoconductor and the developing means.
In order to charge the toner, in a two-component developer, the toner and the carrier are stirred and mixed. The toner is frictionally charged by this mixing, but the frictional charging is affected by the temperature.

For this purpose, it is necessary to correct the temperature characteristics in each step of the electrophotographic process. For this reason, a means for detecting the temperature under various conditions to be corrected is prepared, or the temperature of various processing means such as a photoconductor is itself measured. It has a means for controlling the temperature within a predetermined temperature range. Examples of the means for detecting the temperature include a charging roller thermistor for detecting the temperature of the charging roller and a photoconductor thermistor for detecting the temperature of the photoconductor.Examples of the means for managing the temperature include a power switch of the device. There is a photoconductor heater that heats and heats the photoconductor when turned off.

[0004]

However, the charging roller thermistor and the photoreceptor thermistor, which are examples of the above-mentioned means, are desired to be arranged in the vicinity in order to accurately detect the temperature of the charging roller and the photoreceptor. However, in practice, it is often difficult to arrange them in the vicinity due to the convenience of wiring and the ease of assembly, and the component cost of the thermistor does not become ridiculous. In particular, in the case of a small-sized image forming apparatus, there is a case where a process cartridge type in which the photoreceptor as a process means, charging, development, etc. are integrated, and in that case, the process cartridge is replaced by a user, If the process cartridge is provided with the detection means, it becomes a replacement part and the cost increases. If the detection means is provided on the main body side, it is difficult to accurately detect the temperature of the target component.

SUMMARY OF THE INVENTION It is an object of the present invention to solve this problem and to provide an image forming apparatus which is low in cost and has good assemblability.

[0006]

According to a first aspect of the present invention, there is provided an image forming apparatus having an electrophotographic process, comprising: An image forming apparatus has a temperature detecting means for detecting, and the charge removing means for the photoconductor and the temperature detecting means are arranged on the same substrate surface of the printed circuit board to be integrally formed. The invention described in claim 2 is
2. The image forming apparatus according to claim 1, wherein the discharging unit is an LED of a lead component, and the temperature detecting unit is a thermistor of the lead component. According to a third aspect of the present invention, in the image forming apparatus according to the first aspect, the charge removing unit is a chip LED, and the temperature detecting unit is a chip thermistor.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing a configuration of a printed circuit board used in the image forming apparatus according to the first aspect. Thermistor 2 on printed circuit board 1 of static elimination lamp
It is equipped with. In the example of FIG. 1, the LED 3 of the chip and the thermistor 2 of the lead component are integrally formed on the solder side using a double-sided printed circuit board. Reference numeral 4 in FIG. 1 is a harness connection connector.

FIG. 2 is a circuit diagram of the printed circuit board of FIG. By integrally forming the thermistor 2 and the LED 3 on a printed circuit board, it is not necessary to separately assemble them into the main body, and the electric wire of the printed circuit board 1 of the static elimination lamp and the electric wire of the thermistor 2 are formed into one connector as one bundle. Can be connected, so that the assemblability is improved.

Further, there is no need to process the thermistor 2 with an electric wire, and the cost is reduced. Further, in terms of function, the temperature in the vicinity of the photoconductor can be detected more accurately by arranging the thermistor 2 on the same substrate surface as the LED 3 of the static elimination lamp disposed in the vicinity of the photoconductor.

In the control of the image forming apparatus, control is performed so as to optimize various process conditions (charging condition, exposure condition, developing condition, transfer condition, etc.) based on the detected temperature information near the photosensitive member. Accordingly, an optimum image under the temperature condition can be obtained under any temperature condition.

FIG. 3 is a schematic diagram showing the configuration of a printed circuit board used in the image forming apparatus according to the second aspect. This is a case where the LED 3 of the lead component and the thermistor 2 of the lead component are mounted on the same surface (the component surface side) using the printed circuit board 1 on one side. The connector 4 is also mounted on the same surface, here on the component side. In this case, the printed circuit board 1
Since one side can be used, the cost required for the printed circuit board 1 can be reduced as compared with the case where both sides are used, and the printed circuit board 1 can be assembled by a single solder flow. (Soldering) Cost can be reduced.

FIG. 4 is a schematic view showing the configuration of a printed circuit board used in the image forming apparatus according to the third aspect. This is a case where the LED 3 of the chip and the thermistor 2 of the chip are mounted on the same surface, here, for example, on the solder surface side, using the printed circuit board 1 on one side. In this case, the production cost required for the printed circuit board 1 can be reduced as compared with the case where both sides are used because the printed circuit board 1 can be used on one side, and the printed circuit board 1 is assembled by a single solder flow. So you can
Assembly (soldering) costs can be reduced.

[0012]

As described above, in the image forming apparatus according to the first aspect, the thermistor which is a temperature detecting means for detecting the temperature near the photoconductor and the LED which is the means for removing electricity from the photoconductor are printed. Place on the same board surface of the board,
By being integrally formed, improvement in assemblability and cost reduction can be achieved. 	 In the image forming apparatus according to the second and third aspects, it is possible to further reduce the cost of the printed circuit board and simplify the soldering.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a configuration of a printed circuit board used in an image forming apparatus according to the first embodiment.

FIG. 2 is a circuit diagram of the printed circuit board of FIG. 1;

FIG. 3 is a schematic view showing a configuration of a printed circuit board used in the image forming apparatus according to the second embodiment.

FIG. 4 is a schematic diagram showing a configuration of a printed circuit board used in the image forming apparatus according to the third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printed circuit board 2, 6 Thermistor 3, 5 LED 4 Harness

Claims (3)

[Claims] 1. An image forming apparatus having an electrophotographic process, comprising: a temperature detecting means for detecting a temperature near a photoconductor as a temperature correcting means for the electrophotographic process; An image forming apparatus, wherein the image forming apparatus is disposed on the same substrate surface of a printed circuit board and integrally formed. 2. The image forming apparatus according to claim 1, wherein the charge removing unit is an LED of a lead component, and the temperature detecting unit is a thermistor of the lead component. 3. The image forming apparatus according to claim 1, wherein the charge removing unit is a chip LED, and the temperature detecting unit is a chip thermistor.