JPS63163472A - Image forming device - Google Patents

Abstract

PURPOSE:To exactly remove ozone, and also, to raise a cooling effect in a device by providing two pieces of ventilating means of a first ventilating means for allowing the open air to flow into the device, and a second ventilating means for exhausting the internal air to the outside of the device. CONSTITUTION:On a power unit 10 and a PCB 11, a first fan motor 12 is provided, and the air of the outside of a machine is allowed to flow into a printer. Also, on the right upper part of the printer, a second fan motor 13 is provided, the air of the inside of the printer is exhausted to the outside of the machine, and an ozone filter 14 is placed on this side in the ventilating direction of the fan motor 13. Accordingly, even if the power unit 10 and the PCB 11 are placed concentrically, a laser beam printer 1 is cooled by the ventilation of the open air, and also, ozone generated from a corona discharge device is diffused in the printer, fed to the second fan motor 13, its concentration is dropped by an ozone filter 14, thereafter, it is exhausted to the outside of the machine by the second fan motor 13. In such a way, the emission of ozone is decreased, and the cooling effect is raised.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to an image forming apparatus using a corona discharger.

In electrophotographic image forming devices such as electrophotographic copying machines, laser printers, and facsimile machines, a charger is used to charge the photoreceptor, and a charger is used to transfer the toner image formed on the photoreceptor to transfer paper. A corona discharger is generally used as a transfer charger for separating the transferred transfer paper from the photoreceptor and a charge eliminating charge for separating the transferred transfer paper from the photoreceptor.

A corona discharger generates ozone during corona discharge, but since ozone is harmful to the human body if it exceeds a certain concentration, an ozone filter is usually installed at the air outlet of the recording device's fan to prevent ozone from being generated by the corona discharger. The ozone diffused in the air inside the aircraft was removed to a safe concentration and released outside the aircraft. In addition, in order to cool down the heat generated by the power supply unit, print, circuit board, etc. in the recording device, a fan was used to blow air. In this case, the two fans are for discharging the air inside the aircraft to the outside, and therefore there is a problem in that ozone leaks due to the heat dissipation fans.

For this reason, it is conceivable to provide an ozone filter to the heat dissipation fan, but the filter reduces the cooling effect. Furthermore, it has been proposed to completely separate the ozone generating part from other parts, but in this case it is necessary to remove high concentrations of ozone, which not only increases the size and cost of the ozone filter, but also reduces the cost of the filter itself. The lifespan of will also be shortened.

OBJECTS It is an object of the present invention to provide an image forming apparatus that can eliminate the above-mentioned conventional problems, reliably remove ozone, and improve the cooling effect inside the apparatus.

This object has been achieved by the present invention including at least two blowing means: a first blowing means for introducing outside air into the apparatus and a second blowing means for discharging inside air out of the apparatus. .

The following is a diagram showing an embodiment in which the present invention is applied to a laser printer.

The laser printer 1 is provided with a laser beam writing unit 3, a developing unit 4, a transfer charger 5, a cleaning device 6, and a charging charger 7 in the running direction indicated by an arrow A along the photoreceptor belt 2. When the photoreceptor belt 2 is run in the direction of arrow A, a toner image is formed on the belt 2 by a known electrostatic photographic process.
This toner image is transferred by the action of the transfer charger 5 onto the transfer material fed to the transfer section by the paper feeder 9. After the transfer, the transfer material is conveyed to the fixing unit 8, where it is fixed, recording is completed, and the material is discharged from the machine. In the laser beam writing unit 3, scanning is performed by deflecting the laser beam generated by the laser diode 3-1 by a rotating polygon mirror 3-2 which rotates at a constant high speed.

The transfer charger 5 and charger 7 described above are configured as corona dischargers, and ozone is generated during corona discharge.

On the other hand, in the laser printer 1, the power supply unit 10 and the printed circuit board (hereinafter referred to as PCB 4.1) are arranged locally, that is, concentrated in the lower left part of the figure, from the viewpoint of cost radiation noise, etc. ing. However, when they are arranged in such a concentrated manner, heat becomes high and the reliability of the device decreases, especially in laser printers that use many semi-concentric elements. For this reason, conventional configurations used fans to dissipate heat outside the machine and cool it, but these three
As previously explained, if one type is used, problems such as ozone being emitted will occur.

Therefore, the present invention takes the following measures.

The above-mentioned power supply unit 10 and PCB 11 are provided with a first air blowing means configured as a first fan motor 12 in the vicinity thereof, and this first fan motor 12 is configured to cause air from outside the machine to flow into the printer. It is set. Also, the first
A second blowing means configured as a second fan motor 13 is provided at a substantially symmetrical position to the fan motor 12, ie at the upper right side of the printer. This second fan motor 13
is set to release the air inside the printer to the outside of the printer.
An ozone filter 14 is placed in front of the second fan motor 13 in the air blowing direction.

The laser printer 1 configured in this manner is cooled by the outside air blown by the first fan motor 12 even if the power supply unit 10 and the PCB 11 are arranged centrally, and the ozone generated from the corona discharger is diffused within the printer. The air is sent to the second fan motor 13 by the air shown by the dashed arrow. Then, after its concentration is sufficiently reduced by the ozone filter 14, it is discharged outside the machine by the second fan motor 13.

Thus, in the present invention, since the first fan motor 12 that contributes to cooling is used as a suction fan, it is almost impossible for ozone to flow out from this fan motor. Further, ozone generated by corona discharge is diffused into the printer and removed by the ozone filter 14. At this time, ozone is diffused and has a relatively low concentration, so ozone removal is efficient. Since only a small amount of air needs to pass through the ozone filter 14, there is no large resistance and wind noise is reduced.

Although preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and can be modified in various ways.

For example, the ozone filter may be placed downstream of the second fan motor in the air blowing direction. In addition to the first fan motor and the second fan motor, another fan motor for suction or discharge may be provided as necessary.

Effects According to the present invention, less ozone is emitted and safety is improved. Further, the effects of low noise and high cooling effect were also obtained.

[Brief explanation of the drawing]

The figure is an explanatory diagram showing one embodiment of the present invention. 1...Laser printer 5...Transfer charger 7.Electrical charger 12...first fan motor 13...Second fan motor

Claims (1)

[Claims] An image forming apparatus using a corona discharger is characterized by comprising at least two blowing means: a first blowing means for introducing outside air into the apparatus and a second blowing means for discharging inside air to the outside of the apparatus. electrophotographic equipment.