JPS6239404Y2 - - Google Patents

Description

[Detailed description of the invention] This invention aims to prevent the temperature rise of the document table due to the exposure light source in an electrostatic recording device, and in particular, to prevent the temperature of the document table from rising in the document table movable type recording device without adding any special parts. This invention relates to a cooling device that effectively prevents the rise in temperature.

Halogen lamps are widely used as light sources for document illumination in electrostatic recording devices because of their ease of brightness and light distribution adjustment.

However, this light source generates significant infrared radiation,
Continuous copying increases the temperature of the glass on the document table, and in extreme cases there is a risk of breaking the glass or causing burns to the operator.

For this reason, methods such as blowing air from a cooling fan toward the original glass or installing an infrared absorbing filter between the light source and the original glass are commonly used.

However, incorporating a dedicated cooling fan for this cooling would go against the recent trend of miniaturization and cost reduction in terms of space and cost. In addition, although infrared absorption filters are effective for a while after copying starts, when copying continuously, the temperature of the filter itself rises, and it is necessary to consider the cooling method for the filter. Currently, they are used in combination.

This idea utilizes a fan that has traditionally been used for other purposes in electrostatic recording devices, and skillfully utilizes the characteristics of a document table moving type recording device, without adding any special mechanism. This made it possible to cool the document table and filter.

This invention will be explained in detail below with reference to the drawings. FIG. 1 shows the exposure/optical system and fixing section in the configuration of a known general document plate moving type electrostatic recording device. In the figure, 11 is the electrostatic recording device body, 12 is a photoreceptor, and 13 is a fixing section. 1 is a light source, 2 is a document table glass, 3 is a reflection plate, and 4 is a mirror. 5 is the lens,
7 is a heat absorption filter.

A heater that uses a considerable amount of electric power is used for fusing, and there is a concern that the rise in temperature inside the machine may have an adverse effect on the photoreceptor. It is normally discharged outside.

On the other hand, as described above, the simplest and most commonly used method is to provide a dedicated cooling fan 6 for cooling the document glass 2 and the infrared filter 7.

In many electrostatic recording devices, the position of the cooling fan is near the fixing unit, as shown in Figure 1, due to conditions such as the optical scanning direction, and in small machines, the position of the cooling fan is in this direction outside the machine. Usually, it slides out in one direction.

In this invention, in order to achieve the above-mentioned purpose, as shown in FIG. It is constructed so that it hits the glass surface when it comes.

During continuous copying, this exhaust air A has a temperature difference of approximately 20°C to 40°C between it and the original glass, and not only has a cooling effect itself, but also
The document table has the effect of sucking out the air in the corners formed by the draft as a wake, and thus sucking the cold air B from the outside through the gap between the document table 2 and the top surface of the main body, and is not directly hit by the exhaust air A. It also has the effect of cooling the parts and the infrared filter 7.

In this embodiment, the above-mentioned effect was obtained by simply providing the deflection plate 9 for the exhaust air A.
As shown in Fig. 3, the exhaust air is transmitted through a duct to the glass surface of the document table, and the corner formed by the document table 2, the main body 11, and the exhaust air A is made small to reduce the suction effect of the cold air B. It is also possible to make design changes such as increasing the distance between the machine body 11 and the document table 2 so as to increase the suction resistance of the cold air B or reduce the suction resistance of the cold air B.

Furthermore, this exhaust air is
It is also possible to make it blow out in the direction of the light source lamp between the two. In this case, it goes without saying that the direction of suction of the cold air B is reversed. In addition, when the wind pressure of the exhaust air is high, even if only a part of the exhaust air is guided as described above, a cold air suction effect can be obtained. This has the advantage of further reducing the

As explained above, this idea utilizes the exhaust air from the cooling fan, which was conventionally used only to prevent temperature rise inside the machine, and cleverly utilizes the positional relationship between the machine and the document table to remove cold air. It produces a suction effect and does not require any special equipment or parts.
This makes it possible to cool the document table glass and infrared filter, making it possible to downsize and reduce the size of electrostatic recording devices.
This is highly effective in reducing costs.

[Brief explanation of the drawing]

FIG. 1 is a mechanical diagram of a conventionally known electrostatic recording device, FIG. 2 is an embodiment of this invention, and FIGS. 3 and 4 are mechanical diagrams of other embodiments with different ventilation ducts. The codes inside are respectively 1: light source, 2: original platen,
4: Mirror, 5: Lens, 6, 8: Cooling fan,
7: infrared filter, 9: deflection plate. 11: Aircraft,
12: photoreceptor, 13: fixing section.

Claims (1)

[Scope of utility model registration request] In an electrostatic recording device with a movable document table that has a cooling fan to prevent internal temperature rise inside the device, when part of the document table moves outside the recording device, the bottom surface of the document table that has moved outside the recording device. An electrostatic recording device characterized in that an exhaust port for the cooling fan is provided in the device main body so that the exhaust air from the cooling fan hits the device.