JPH01224742A - Exposure lighting device - Google Patents

Abstract

PURPOSE:To satisfy safetiness and to improve reliability by providing detecting means which detect the damages of an infrared permeation preventing filter and transmit the information to the controlling part of an image forming device. CONSTITUTION:The title device is provided with a light source 1 which generates light which exposes a photosensitive body 7, the infrared permeation preventing filter 8 provided close to the light source 1, and the detecting means 13 and 14 which detect the damages of the infrared permeation preventing filter 8 and transmit the information to the controlling part 18 of the image forming device. Thus, the failure of the infrared permeation preventing filter 8, etc. included in the light source part caused by the overheat of the light source part, etc., is directly detected using the simple method, and the mechanical troubles caused by excess temperature increase by the failure of the infrared absorbing filter, and firing caused by the transfer paper included in a copying device are also prevented, and the reliability is improved, and the safetiness is maintained.

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.

[Conventional technology]

Color images are formed using a photoreceptor with microcapsules on its surface encapsulating a photocurable substance and three types of color formers: yellow, magenta, and cyan, as shown in Japanese Patent Application Laid-Open No. 59-30537. A copying machine that hardens microcapsules by exposing them to light according to the image to be recorded, then applies pressure to rupture the unhardened microcapsules to develop color and transfer it to transfer paper to form a color image. or a photosensitive transfer type image forming apparatus such as a printer.

[Problem to be solved by the invention]

In this case, the sensitivity of the photoreceptor is extremely low, 1/1000 of that of normal photographic film, so the exposure lighting device is required to use high output power.
It becomes necessary to use a highly efficient light source. Generally speaking, halogen lamps are widely used as light sources for copiers, printers, etc. due to ease of use, light output, price, etc. However, when a high-output halogen lamp is used as a light source, Because it generates a large amount of heat, it causes physical, chemical, and mechanical deformation and alteration due to the heat on various parts and the entire device surrounding the light source, causing adverse effects. Therefore, in order to release this heat to the outside of the device, A heat dissipation mechanism using an infrared absorption filter, an infrared reflection filter, a cooling fan, etc. will be installed near the lamp, but since halogen lamps have high output, the surface temperature of the above filters, especially the infrared absorption filter, will rise, causing the lamp output to decrease. is maximum, about 500 on the filter
Temperatures can even reach temperatures above ℃.

Therefore, in the case of M-bad, the infrared absorption filter and the infrared reflection filter may be mechanically destroyed due to heat absorption.

In this case, the destruction of the filter will directly lead to the deterioration of the image recording ability of the photosensitive transfer type pixel forming device, and if image recording continues in this state, other parts of the device, especially those made by injection molding, will be damaged. thermal deformation of plastic parts,
There is a risk of ignition due to the heat of the transfer member, so it is necessary to detect damage or destruction of the infrared absorption filter or infrared reflection filter by some method.

The present invention was made to solve such problems, and its purpose is to directly detect damage or destruction of an infrared absorption filter or an infrared reflection filter at the same time as it occurs, and to improve safety. The purpose of the present invention is to provide a highly reliable exposure illumination device that satisfies the following.

[Means to solve the problem]

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 a photoreceptor onto the transfer member, a light source that generates light that exposes the photoreceptor, an infrared transmission prevention filter provided near the light source, and an infrared transmission prevention filter provided in the vicinity of the light source; The image forming apparatus is characterized in that it includes a detecting means for detecting damage to the prevention filter and transmitting the detected damage to a control section of the image forming apparatus.

[For production]

According to the above configuration of the present invention, the detection means detects the destruction of the infrared transmission prevention filter and feeds back the detected damage to the control section in the photoreceptor transfer type image forming apparatus, thereby stopping the operation of the apparatus. .

〔Example〕

Embodiments of the present invention will be described in detail based on the drawings. 1st
The drawing is a side view of the exposure illumination device of the present invention used in, for example, a slit exposure forming copying machine.

In Fig. 1, 1 is a straight tube-shaped halogen lamp, and a filament 1 is placed in the center of a glass tube 1-a made of quartz glass.
b is retained. Reference numeral 2 denotes a concave reflecting mirror, the inner wall of which is formed with a reflecting surface that reflects light rays emitted from the halogen lamp 1, and is made of, for example, high-brightness aluminum with a polished surface.

The concave reflecting mirror 2 is formed by combining two types of cylinders and one type of elliptical cylinder. 3 is a transparent document table, and document 4
The document is scanned by placing it thereon and moving it in the direction of arrow A or B.

Among the light beams emitted from the filament 1b of the halogen lamp 1, visible light beams are focused at the document illumination position C, and are focused on the document illumination position C.
The infrared rays are absorbed by an infrared absorption filter 8 provided on the way to the document irradiation position C. The infrared absorption filter 8 is made of, for example, phosphate glass mixed with F e ", and a thin line or a paper-like electrode is formed on the surface by vacuum deposition. Below the document irradiation position C. A lens 5 and an exposure table 6 are arranged, and the unexposed photosensitive film discharged from the cassette 20 moves on the exposure table 6 in the direction of the arrow at the same speed as the document table 3. , microcapsules containing a photocuring substance and a dye precursor are provided.Visible light reflected from the surface of the original 4 passes through a lens 5 and is then directed onto a photosensitive film 7 moving on an exposure table 6. The projected microcapsules unnecessary for image formation are cured.The exposed photosensitive film 7 is sent to the pressure developing mechanism 30 located below the exposure stage 6.Meanwhile, the transfer paper 41 is also sent out from the transfer paper set 40. , and are conveyed to the pressure developing mechanism 30. The exposed photosensitive film 7 and the transfer paper 41 are overlapped and pressed between pressure rollers 31 and 30 in the pressure developing mechanism 30.

As a result, uncured microcapsules on the photosensitive film 7 are crushed, and a colored image is formed on the transfer paper 41. After passing through the pressure developing mechanism, the photosensitive film 7 returns to the cassette 20 and is wound up.

On the other hand, the transfer paper 41 is sent to a heat treatment means 50, where the development reaction is accelerated by heating, a complete image is given to the surface of the transfer paper 41, the image is completed, and the paper is discharged from the copying apparatus.

Next, the means for detecting damage to the infrared absorption filter, which is a feature of the present invention, will be explained.

FIG. 2 is a schematic enlarged view showing a pattern of transparent electrodes provided on the surface of the infrared absorption filter in FIG. 1.

FIG. 3 is a schematic configuration diagram showing the relationship between the detection circuit using the infrared absorption filter and the control section in FIGS. 1 and 2.

In FIGS. 2 and 3, the infrared absorption filter 8 has a transparent A9 vapor-deposited film, for example, indium nesa, formed on its surface by wet or dry etching to form a pattern consisting of continuous lines. There is.

The space between the ends All and 11B12 can be equivalently regarded as electrical resistance as shown in FIG.

At the same time that the halogen rung 1 is energized and starts emitting light, the control unit 18 sends a set signal 15 to the flip-flop 14, and sets the interrupt signal 16 to a high level in the digital signal.

For some reason, the inside of the lighting device has become abnormally high temperature.
When a part of the transparent N tIi of the infrared absorption filter 8 is destroyed, the terminal All and @B12 become open, and the buffer 13 is grounded by the pull-down resistor 17. At the same time, the output of the buffer 13 is
4, the output of the flip-flop falls from a high level to a low level, and informs the control unit 18 that some abnormality has occurred in the infrared absorption filter 8.

Upon receiving the interrupt signal 16, the control unit 18 stops the halogen lamp 1 from emitting light, notifies the outside of the occurrence of an abnormality, and can prevent further damage to the lighting unit.

The embodiments of the present invention have been described using a slit exposure type copying machine with a moving document table as an example, but it can also be applied to a slit exposure type copying machine where the document table does not move but the illumination device moves. It goes without saying that the present invention can also be applied to other types of copying machines.

[Effects of the Invention] As described above, according to the present invention, damage to the infrared transmission prevention filter, etc. included in the light source unit due to over-heating of the light source unit can be directly detected using a simple method. This makes it possible to prevent mechanical damage caused by excessive temperature rise due to destruction of infrared absorption filters and the risk of fire caused by transfer paper contained in the copying device, improving reliability and increasing safety. It has the effect of certainty.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view when the exposure illumination device of the present invention is used in, for example, a slit exposure type copying machine. FIG. 2 is a schematic enlarged view of the infrared absorption filter shown in FIG. 1 without showing the transparent electrodes on the surface thereof. FIG. 3 is a schematic configuration diagram showing the electrical relationship between the detection circuit using the infrared absorption filter in FIGS. 1 and 2 and a control section that is a control section of the copying apparatus. Applicant: Seiko Epson Corporation

Claims (1)

[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 transferred and developed onto the transfer member by overlapping the photoreceptor with a transfer member and applying pressure. In an exposure illumination device of a photosensitive transfer type image forming apparatus, a light source that generates light for exposing the photoreceptor, an infrared transmission prevention filter provided in the vicinity of the light source, and damage to the infrared transmission prevention filter is detected, An exposure illumination device comprising: a detection means for transmitting information to a control section of the image forming apparatus.