JPH01128060A - Exposure lighting device - Google Patents

Abstract

PURPOSE:To pass through cold wind generated by a cooling means and to improve the cooling effect on a light source, a reflecting mirror and infrared ray prevention filters by forming vent holes on a concave reflecting mirror which condenses beams emitted from the light source. CONSTITUTION:The title device is provided with a straight tube shaped halogen lamp 1 which composes the light source, the concave reflecting mirror 2 which condenses beams emitted by the halogen lamp, the infrared ray prevention filters 8a and 8b provided close to the halogen lamp 1 preventing the infrared rays generated by the halogen lamp 1 and the cooling means which cools at least the halogen lamp 1, the concave reflecting mirror 2, and the infrared ray prevention filters 8a and 8b. The vent holes 41-43 are formed on the concave reflecting mirror 2. Thus the air cooling of the light source 1, the reflecting mirror 2 and the infrared ray prevention filters 8a and 8b which reflect and absorb infrared rays is made sufficient.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an exposure illumination device for an image forming apparatus such as a copying machine or a printer that uses light.

[Conventional technology]

As shown in Japanese Patent Application Laid-Open No. 59-30537, color images are created using a photosensitive film with microcapsules on its surface containing a photocurable substance and three types of color formers, yellow, magenta, and cyan. As a forming device, a photosensitive transfer type forming device such as a copying machine or a printer that develops color by bursting microcapsules according to the image to be recorded and transfers it to transfer paper to form a color image can be considered.

In this case, since the photosensitivity of the photosensitive film is very low, about 1/1000 of that of ordinary photographic film, it becomes necessary to use a high-power, high-efficiency light source in the exposure illumination device. In the case of copiers, printers, etc., halogen lamps are commonly used as light sources due to their ease of use, light output, and price, but high-output halogen lamps like the ones mentioned above generate a large amount of heat. Therefore, various members around the light source are adversely affected. In order to prevent this heat, an infrared absorbing or infrared reflecting filter must be installed near the lamp, but since the halogen lamp has a high output, the surface temperature of the filter increases considerably, and depending on the lamp output, the surface temperature of the filter increases. The temperature can reach approximately 500°C. Therefore,
There is a risk that phenomena such as damage to the filter may occur. Therefore, to prevent this, it is necessary to take measures such as cooling with a powerful cooling fan, for example.

\ [Problems to be Solved by the Invention] However, if the above-mentioned prior art is used as is in the present device, the sensitivity of the photoreceptor is low, so the same light energy as in the prior art will result in insufficient exposure. In order to obtain a sufficient amount of exposure, it is necessary to secure the amount of exposure by increasing the capacity of the light source, extending the exposure time, or the like.

Accordingly, the amount of heat generated by exposure increases, resulting in an increase in the temperature of the entire apparatus, which may lead to a decrease in functionality and a problem in handling safety.

Therefore, a cooling means is absolutely necessary for the lamp unit, but if only a filter for infrared absorption or infrared reflection is used, the filter temperature will rise considerably and the filter will be damaged, and the temperature of the entire device will rise, and cooling will not be possible. It becomes complete.

Therefore, a means of forced cooling using a powerful cooling fan is necessary, but as equipment becomes smaller and more powerful, it becomes difficult to blow sufficient cooling air, especially around the reflector that condenses the light rays emitted from the light source. Because of their complicated structure, air blowing tends to be insufficient, leading to an increase in the temperature of each member, resulting in a problem of decreased functionality.

The purpose of the present invention is to provide sufficient air cooling for a light source, a reflecting mirror, and an infrared prevention filter that reflects and absorbs infrared rays emitted from the light source, to prevent temperature rises and functional deterioration due to the temperature increase, and to reduce the size and size of the light source. The object of the present invention is to provide a high-output exposure illumination device.

[Means for solving problems]

The exposure illumination device of the present invention exposes a photoreceptor whose support is coated with microcapsules containing a photosensitive material and a transfer material, and then overlaps the transfer member and pressurizes the transfer material of the photoreceptor. In an exposure illumination device of a photosensitive transfer type image forming apparatus that transfers and develops onto the transfer member, a light source, a reflecting mirror that condenses the light beam emitted from the light source,
an infrared ray prevention filter provided near the light source to prevent infrared rays emitted from the light source, and a cooling means for air cooling at least the light source, the reflecting mirror, and the infrared ray preventing filter, and the reflecting mirror has a ventilation hole. It is characterized by the formation of

〔Example〕

A case will be described in which an embodiment of the present invention is applied to a slit exposure type copying machine.

In Figure 1, 1 is the rated power of 900W that constitutes the light source.
The straight tube-shaped halogen lamp 2 is a concave reflecting mirror, and its inner wall surface is formed with a reflecting surface for reflecting light rays emitted from the halogen lamp 1, and is made of, for example, high-brightness aluminum with a polished surface. Reference numeral 3 denotes a transparent original table, on which an original 4 is placed and moved in the direction of arrow A or arrow B to scan the original. Among the light beams emitted from the halogen lamp 1, visible light is focused on the document irradiation position C and irradiates the document 4, and infrared rays are infrared reflection filter 8a and infrared absorption filter 8b installed on the way to the document irradiation position C. reflected and absorbed by The infrared reflection filter 8a is made by depositing an infrared reflection film on the surface of a glass plate on the halogen lamp side.
b is made of, for example, phosphate glass mixed with Fe''. A lens 5 and an exposure table 6 are arranged below the document irradiation position C, and the above-mentioned elements form an exposure means. The photosensitive film 7, which is an unexposed photoreceptor discharged from the photosensitive film cassette 9, moves on the exposure table 6 in the direction of arrow E at the same speed as the document table 3. A microcapsule containing a substance and a coloring agent is provided.Visible light reflected from the surface of the original 4 passes through a lens 5, and then is projected onto a photosensitive film 7 moving on an exposure table 6, forming an image. Unnecessary microcapsules are cured.The exposed photosensitive film 7 is transferred to a pressure developing mechanism 10 which is a developing means disposed below the exposure table 6.
sent to. On the other hand, the transfer paper 11 as a transfer member is also sent out in the direction of the arrow from the transfer paper cassette 12 and conveyed to the pressure developing mechanism 10. The exposed photosensitive film 7 and transfer paper 11 are transferred to pressure rollers 13 and 14 in a pressure development mechanism 10.
They are overlapped and pressurized between them. As a result, the uncured microcapsules on the photosensitive film 7 are crushed, and a colored image is formed on the transfer paper 11. After pressure development, the photosensitive film 7 is transferred to the photosensitive film cassette 9 again.
It goes back inside and is wound up.

On the other hand, the transfer paper 11 is sent to a heat treatment means 15, where the development reaction is accelerated by heating, the surface is given gloss, a completed image is formed, and the paper is discharged out of the copying machine.

In this example, the lamp unit and main cooling means constituting the exposure means are arranged in a drawer-shaped cartridge. Next, this cartridge will be explained. Figure 2 is a plan view of the cartridge and auxiliary cooling section, Figure 3 is H of Figure 2.
-H sectional view. FIG. 4 is a plan view of the lamp unit.

First, the halogen lamp 1 has electrode sockets 20 on both sides.
The electrode socket 20 is fixedly held by the outer plate 17 with screws or the like. The concave reflecting mirror 2 is supported on both sides by inner plates via a shaft 2a. The infrared reflection filter 8a and the infrared absorption filter 8b are each fitted into a frame 16, and both ends of the frame 16 are bent into an L shape and are screwed to an outer plate 17. The outer plate 17 is fixed to the lamp unit case 18 with screws or the like. A duct 19 is formed inside the upper surface of the lamp unit case 18 as a main cooling means for sending cold air toward the halogen lamp 1. The duct 19 communicates with the cold air intake 18a of the lamp unit case 18, and as shown in FIG. There is.

Furthermore, a hot air outlet 18b is also formed on the surface of the lamp unit case where the cold air intake port 18a is located, so that air warmed around the lamp is exhausted. Note that the rear extension portion 21 of the concave reflecting mirror 2 plays the role of a separator that separates the cold air passage and the hot air passage. An electrode protrusion (not shown) is attached to the bottom of the lamp unit case 18, and is connected to an electrode socket 20 by a cord (not shown). In this way, the lamp unit case 18 includes a halogen lamp 1, a concave reflector 2,
An infrared reflection filter 8a, an infrared absorption filter 8b, a duct 1-19, and their accessories are accommodated.

On the other hand, as shown in FIG. 3, the cartridge 22 is provided with an axial fan 23, which is a main cooling means, adjacent to the cold air intake 18a, and communicates with the outside via a duct 40. A cross flow fan 24 is attached to the cartridge case 22 at the lower right of the duct 40 in FIG.

The cartridge case is further provided with a vent port 5a and an exhaust port 25b, the vent port 25a takes in outside air into the cartridge case, and the exhaust port 25b discharges the air inside the cartridge to the outside. It will become a mouth for you. The top cover of the cartridge case 22 is screwed, and during maintenance work, by pulling out the cartridge 22 and removing the top cover, the inside can be seen and cleaning etc. can be easily performed. The above describes the axial fan 23, duct 40, cross flow fan 24, vent 25a1 exhaust port 25b provided on the cartridge 22 side, and the cold air intake 18a1 duct 19 and hot air outlet provided on the lamp unit 18 side. 18
b constitutes the main cooling means.

In this embodiment, the auxiliary cooling means is installed outside the cartridge, as shown in FIG. In front and behind the lens 5, there are a partition plate 28 between the lamp unit and the main body, and an auxiliary cooling air duct side plate 29, and an air duct 27 is formed by these and the document table. An axial fan 30 serving as auxiliary cooling means is attached to one side of this air passage. The other side of the windway is
It is connected to an air passage 31 provided inside the lamp unit case.

Next, how the air flows through the main cooling means and the auxiliary cooling means will be explained. In the main cooling means, an axial fan 23
is driven, outside air is taken in through the duct 40. The cold air sent by the axial fan 23 flows along the arrow shown in FIG. 3 through the cold air intake 18a and the duct 19, and is split into two directions at the back of the concave reflector. One stream flows above the concave reflector and passes between the infrared reflection filter 8a and the infrared absorption filter 8b, and the other stream passes through the ventilation hole opened in the concave reflector 2, hits the halogen lamp 1, and the infrared rays flow through the concave reflector 2. It flows downward along the reflection filter 8a, merges with the previous cooling air below the filter,
The area around the lamp is cooled. The ventilation hole opened in this concave reflecting mirror 2 will be explained in detail later. The air warmed by the high heat around the lamp flows toward the crossflow frame 24 along the arrow through the hot air outlet 18b. Here, by the operation of the cross flow fan 24, the hot air is cooled by the outside air taken in from the vent 25a,
The air is exhausted to the outside through the exhaust port 25b.

In addition, in the auxiliary cooling means, the axial fan 30 is driven to draw outside air from the outside into the air passage 27 through the air passage 26 . The taken in outside air cools the heated lens 5 by heat transfer from the lamp unit while passing through the air passages 27 in front and behind the lens 5. The wind that has passed through the air passage 27 flows into the air passage 31 inside the cartridge case 22, merges with the exhaust air from the main cooling means, and flows toward the cross-flow fan 24. The cross flow fan 24 cools the outside air taken in through the ventilation port 25a, and exhausts the air to the outside through the exhaust port 25b.

Next, the ventilation hole on the back of the concave reflector, which is a feature of the present invention, will be explained.

This ventilation hole has a ventilation effect around the halogen lamp.
This further enhances the cooling effect of each member surrounding the light source, such as the halogen lamp 1, concave reflector 2, and infrared reflection filter, and prevents functional deterioration due to temperature rise. FIG. 4 shows an embodiment and its characteristics.

The ventilation holes shown in FIGS. 4(a), 4(b), and 4(c) are all opened at effective positions that do not significantly affect the light gathering ability of the concave reflecting mirror 2.

First, in FIG. 4(a), a ventilation hole 41 is provided at the rear of the non-light emitting part of the halogen lamp. As is well known, in a straight tube-shaped halogen lamp, the filament, which is the light emitting part, is not continuous but is formed at intervals.

Therefore, a hole was made in a non-light-emitting area where no filament was formed. According to this, the halogen cycle occurring mainly in the light emitting part is not adversely affected by cooling, so that effective cooling can be performed without reducing the life of the halogen lamp.

In FIG. 4(b), holes 42 are formed in the concave reflecting mirror 2 at uniform intervals in the lateral direction. In this case, the holes are made at approximately equal intervals, so the light emitting part will also be cooled, but if the hole diameter and air volume are selected appropriately, this will not affect the halogen cycle much. According to this, it is possible to uniformly blow air around the halogen lamp, and since there is no local cooling of the concave reflector, deformation of the concave reflector due to thermal expansion can be prevented.

In FIG. 4(C), a long hole 43 is formed in the lateral direction of the concave reflecting mirror 2. With this method, some of the light emitted from the halogen lamp cannot be used effectively, but since the flow rate of cooling air can be increased, a sufficient cooling effect can be expected even when the light source has a high output and heat generation increases. .

The exposure illumination device of the present invention has been described above using an example in which the lamp unit and the main cooling means are arranged on a cartridge, but it is not necessary that the halogen lamp and its surrounding components be integrated into a unit. Alternatively, the lamp unit and the main cooling means may not be made into a cartridge. Furthermore, it may not be provided with an auxiliary cooling means, and is not limited to the above-mentioned embodiment.

〔Effect of the invention〕

As described above, according to the present invention, in the exposure illumination device of the photosensitive transfer type image forming apparatus, the ventilation hole is formed in the reflecting mirror that condenses the light rays emitted from the light source.
The cold air generated by the cooling means passes through the ventilation openings to enhance the cooling effect of the light source, the reflector, and the infrared ray prevention filter, thereby preventing the adverse effects of a decrease in their functions due to temperature rise.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic side view showing the entire photosensitive transfer type image forming apparatus using the exposure illumination device of the present invention. FIG. 2 is a plan view showing the vicinity of the main cooling means and auxiliary cooling means of the exposure illumination apparatus of the present invention. FIG. 3 is a sectional view taken along line H-H in FIG. 2. FIGS. 4(a) to 4(C) are perspective views showing examples of ventilation holes formed in a concave reflecting mirror. ■...Halogen lamp 2...Concave reflecting mirror 7...Photosensitive film 8a...Infrared reflection filter 8b...Infrared absorption filter 10...Pressure developing mechanism 11...Transfer paper 41.42. 43...Ventilation or higher

Claims (1)

[Scope of Claims] After exposing a photoreceptor whose support is coated with microcapsules containing a photosensitive material and a transfer material, the transfer material of the photoreceptor is superimposed on a transfer member and pressurized. An exposure illumination device for a photosensitive transfer type image forming apparatus that transfers and develops onto a transfer member includes a light source, a reflecting mirror that focuses light rays emitted from the light source, and a reflector that is provided near the light source to prevent infrared rays emitted from the light source. 1. An exposure illumination device comprising: an infrared ray prevention filter; a cooling means for air cooling at least the light source, the reflecting mirror, and the infrared ray preventing filter; and a ventilation hole is formed in the reflecting mirror.