JPH04102111A - electronic equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an electronic device including an exhaust fan that exhausts air inside a case from an exhaust port.

[Prior Art] Conventionally, it has been known to provide an inlet, an exhaust port, and an exhaust fan in an electronic device to direct heat generated by each unit within the device. For example, the laser beam printer shown in FIG. 2 includes an exhaust fan 12, a process cartridge 14, a thermal fixing device 16, a writing optical scanning device 18, a low-voltage power source 20, a high-voltage power source 22, and a controller for controlling these. It includes each unit such as a control section 24. A suction port 26 is disposed near the high-voltage power supply 22, and the exhaust fan 12 and exhaust port 28 are disposed above the heat fixing device 16, which generates the largest amount of heat.

[Problems to be Solved by the Invention] For this reason, the heat fixing device 16 and the low voltage power supply 2, which generate a large amount of heat,
The process cartridge 14 and the control unit 24 are placed in the middle of the air flow 30 (indicated by a dashed line in FIG. 2) from the air flow 30 to the exhaust fan 12. I will receive it. That is, the temperature of the process cartridge 14 may rise during use of the laser printer, causing a large change in print density.

The present invention has been made to solve the above-mentioned problems, and is characterized by arranging each unit in consideration of the air flow inside the case of an electronic device and the amount of heat generated by each unit. An object of the present invention is to provide an electronic device in which the heat generated by the electronic devices does not adversely affect each other.

[Means for Solving the Problems] To achieve this object, the electronic device of the present invention includes a case that includes a plurality of units that generate heat, and a case that is formed in the case and that draws outside air into the case. an exhaust port formed in the case, and an exhaust fan for exhausting air in the case from the exhaust port, and the amount of heat generated gradually increases from the intake port to the exhaust port. The plurality of units are arranged so that

[Function] In the electronic device of the present invention having the above-described configuration, the flow of air from the inlet to the exhaust port generated by the exhaust fan does not adversely affect each unit.

[Example] Hereinafter, an example embodying the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing a schematic configuration of a laser beam printer according to an embodiment of the present invention.

A first suction port 51 and a second suction port 52 for sucking outside air into the case 5o are formed at the top and right side of the case 50. A writing optical scanning device 60 is disposed in the case 50 below the first suction port 51 . The writing optical scanning device 60 is a unit that includes a semiconductor laser, a polygon mirror 61, a motor, a lens, etc., and irradiates a photosensitive drum 65 with a light beam modulated according to image data.

Near the second suction port 52 and below the writing optical scanning device 60 is a control section 6 that controls the entire laser printer.
2 are arranged.

A process cartridge 64 is disposed to the left of the control section 62 and in the center of the case 50.

The process cartridge 64 is composed of a photosensitive drum 65, a secondary charger, a developing section, a cleaning section, etc., and is a unit that is most easily affected by environmental conditions such as temperature and humidity.

A heat fixing device 66 is disposed on the left side of the process cartridge 64 in the case 50 . The heat fixing device 66 includes a heat roller, a pressure roller, a heater, a temperature detector, etc., and the power consumption of the heater is approximately 600 watts to 1 kilowatt. The thermal fixing device 66 is usually the unit that generates the largest amount of heat in a laser printer.

A high-voltage power source 68 is provided below the control section 62, process cartridge 64, and heat fixing device 66 via a partition plate 53.
A low voltage power supply 70 and an exhaust fan 72 are provided. A first ventilation hole 54 is formed below the control section 62 of the partition plate 53, and a second ventilation hole 55 is formed below the heat fixing device 66.

The high-voltage power source 68 and the low-voltage power source 70 are arranged between both ventilation ports 54,55. The high voltage power supply 68 is a unit that supplies high voltage to a primary charger, a transfer charger, etc.
It is located to the left of the first ventilation port 54. The low-voltage power supply 70 is a unit disposed to the left of the high-voltage power supply 68 and supplies a low voltage to a control section, etc., and is a unit that generates a large amount of heat next to the heat fixing device 66. An exhaust fan 72 is arranged to the left of the second ventilation port 55. This exhaust fan 7
An exhaust port 56 is formed in the case 50 on the left side of 2, and the exhaust fan 72 exhausts the air inside the case 50 to the outside of the case 50 through the exhaust port 56.

Note that the writing optical scanning device 60. control unit 62, process cartridge 64, heat fixing device 66, high voltage power supply 68,
A plurality of units included in the case 50 are configured by the low voltage power supply 70.

The laser printer configured as described above has the first suction port 51 inside the case 50 due to the operation of the exhaust fan 72.
The exhaust port 5 passes through the writing optical scanning device 6o, the process cartridge 64, the heat fixing device 66, and the second ventilation port 55.
6 (indicated by a dashed line in the figure), and air that reaches the exhaust port 56 from the second intake port 52 through the control unit 62, the high voltage power source 68, the low voltage power source 70, and the first ventilation port 54. This occurs as a large air flow, such as a flow 82 (indicated by a - dotted chain line in the figure). Heat generated within the case 50 passes through the heat exhaust fan 10 according to the air flow 80.82, and is emitted υ1 to the outside of the case 50 from the exhaust port 56. Then, units whose heat generation amount gradually increases from upstream to downstream of the air flow 80, 82 are arranged. That is, the units are arranged in the order of the writing optical scanning device 60, the process cartridge 64, the heat fixing device 66, and the heat exhaust fan 72 from upstream to downstream of the air flow 80.

Further, from the upstream to the downstream of the air flow 82, the control unit 62,
Each unit is arranged in the order of high voltage power supply 68, low voltage power supply 70, and heat exhaust fan 72.

As a result, heat generated by the heat fixing device 66 and the low voltage power supply 70 is transferred to the process cartridge 64 or the control unit 62.
It is possible to obtain high quality printing with less negative influence on the image.

Note that the present invention is not limited to the above embodiments, and various changes can be made. For example, the present invention may be embodied in a laser beam printer, or may be applied to electronic devices such as plain paper fax machines and copying machines.

[Effects of the Invention] As is clear from the detailed explanation above, according to the present invention, units whose heat generation amount gradually increases from upstream to downstream of the air flow in the case generated by the exhaust fan are arranged. As a result, the heat generated by each unit does not adversely affect other units.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the structure of a laser beam printer which is an embodiment of the present invention, and FIG. 2 is a sectional view showing the structure of a conventional laser beam printer. In the figure, 50 is a case, 51, 52 is an inlet, 56 is an exhaust port, and 72 is a heat exhaust fan.

Claims (1)

[Scope of Claims] A case containing a plurality of heat generating units; an inlet formed in the case for sucking outside air into the case; an exhaust port formed in the case; and an exhaust port formed in the case. An electronic device equipped with an exhaust fan for exhausting air inside the case from an opening, characterized in that the plurality of units are arranged so that the amount of heat generated gradually increases from the intake opening to the exhaust opening. electronic equipment.