JPS62112148A - Exposing device for copying device - Google Patents

Abstract

PURPOSE:To apply uniform surface pressure to a surface to be exposed even if inclined pressure is applied at the pressing of a copying device from upper part by forming a bowl-like contact member having rubber elasticity, engaged with a frame body and projected from the frame body. CONSTITUTION:A pressing member 63 is constituted of a rubber elasticity material, its section is like a bowl and both upper and lower ends are like opened belts and fitted to the frame body 12 and the shape of the section is formed like an accordion so as to be easily deformed at the pressing of the copying device 1. When the pressing member 63 is fitted to the lower end part of the copying device 1 and set up on the surface to be exposed and the copying device 1 is pressed from the upper part at the time of copying, a contact surface 63a is allowed to contact with the surface to be exposed, and when pressure is applied furthermore, air pressure in an inner part surrounded by the pressing member 63 and a transparent plate 61 is increased and the surface to be exposed can be pressed by the rise of the air pressure, so that contact between a copying sheet 7 and an original 8 on the surface to be exposed can be secured by the pressure.

Description

[Detailed description of the invention] Technical field The present invention relates to an exposure device for a copying machine.

Electrophotographic copying machines, such as the Carlson system, are widely used, but the devices are large, heavy, noisy, and expensive, so there is a need for miniaturization, It is not suitable for W4 band use or lower price. In addition, even if the material to be transferred is designated paper or general plain paper is possible, if it is sheet-like and has folds or missing parts, problems will occur mainly in paper transportation, and booklets such as notebooks and notebooks will It was not possible to obtain copies of the originals, and attempts were made to cut and paste them, but these had the disadvantages of being unsightly and becoming thicker.

(h) In addition, a back plate using a flash bulb and a small copying device for printing have been proposed, but in most cases, the amount required to obtain a copy is one or several copies, and the cost of clothes, Including the cost of bulb lamps, etc., the unit cost of copying becomes very expensive and is not practical. Also.

Many of these plate-making and printing machines have the disadvantage that, due to their structure, the original must be in the form of a sheet or a single-sided original.

(i■) Furthermore, in recent years, small digital copying machines have been proposed that use a reader for reading documents and a printer for recording, but in order to maintain a high level of image quality, the pixels must be made extremely fine. However, it has become expensive.

Copying machines have traditionally been widely used as office machines, but they are all installed on the floor, on a desk, or on a special stand, and when you want to make copies, you have to put the copying machine on. I had to go there.

In view of the above-mentioned actual circumstances, the present applicant first proposes the following.

It is easy to carry around and can be stored in a bag or pocket. We proposed a portable copying machine that is small, very inexpensive compared to conventional copying machines, and has high copy image quality.6 Figure 4 shows an example of the portable copying machine that the applicant had previously proposed. 1 is a partially cutaway perspective view for illustrative purposes. In the figure, 1 is a portable copying device, and as shown in the figure, the copying device 1 is viewed from above the device with an electrical control section 2 having electronic components incorporated on a board. , an operating section 3 including display lamps and switches, a charging section 4 mainly consisting of a capacitor for storing the emitted energy of a flash lamp, a light emitting section 5 consisting of a flash lamp 511, a reflector 52, etc., and a translucent section that brings the original and copy sheet into close contact. Platen plate 61. A transparent platen portion (6, etc.) consisting of a transparent buffer member 62 and the like are arranged in a substantially laminated manner.

FIG. 5 is a side sectional view showing an example of a transfer sheet suitable for use in the portable copying apparatus, and FIG. 6 is a side sectional view.

In Figure 5, which is a partially exploded perspective view, 7 is a transfer sheet, and the transfer sheet 7 is made of a transparent plastic film 71 which is an intermediate transfer body, and a base 72 similar to the transparent plastic film 71, and dyed therein. , and an ink film 74 having a wavelength-selective transmittance and heat-melting wax layer 73 in which a coloring agent such as a pigment is dispersed are closely attached, and a frame 75 is used as necessary.

Examples of the plastic film include polyethylene, polyethylene terephthalate, polypropylene, polyvinyl chloride, polyvinylidene chloride, nylon, etc., and examples of the wax include beeswax.

Candelilla wax, carnauba wax, montan wax, etc., as well as paraffins, low-molecular synthetic resins, etc. can be used. In addition, as for the film thickness, as an extreme example, a glass plate with a thickness of several I can be used as the intermediate transfer body, but it may be difficult for practicality (operability).

10 to 200 μm and even 40 to 60 μm in terms of cost, etc.)
A plastic film of about μm size is used. Since the ink film base is used as a heat transfer layer during copying, a thin layer is preferable; if it becomes thick, not only high energy is required but also the sharpness of one image deteriorates. Practically speaking, a thickness of 3 to 6 μm is used including the production of the ink film. If the ink film wax layer is thin, it will not be possible to obtain a sufficient image, and if it is too thick, the transmittance will be poor, high energy will be required, and "bleeding" will occur easily.
2 to 6 μm is suitable. As a light source, a halogen lamp, a tungsten lamp, etc. can also be used. However, since the shorter the heating time of the wax layer, the sharpness of the image is maintained, flash exposure using a high-output xenon lamp for a short time (e.g., light emission time of 2 to 3 m5 ec or less) is desirable. If the heating time is too long, the heat will be transmitted to parts of the document that do not correspond to the printed lines, resulting in poor sharpness. However, halogen lamps, tungsten lamps, etc. have the advantage of simplifying the electrical system.

FIG. 7 is a diagram for explaining a copying method when information (image area 81) on a document 8 is copied using the copying device 1 and the transfer sheet 7. First, the document 8 to be copied is ,
The transfer sheet 7 is placed on top of the transfer sheet 7 with the ink film side facing the original, and the copying device 1 is placed thereon so that the platen portion 6 is in close contact with the transfer sheet 7. The copying device 1 is a commercial one.
Connected to an OOV power supply or charging battery, the flash charging capacitor is charged to a preset potential level. The platen portion, the transfer sheet, and the M document are uniformly pressed and adhered to the surface of the transfer sheet by the weight of the mounting @1 and pressure applied via the device 1. When the flash lamp trigger switch is turned on in this state, the flash lamp emits light and the document is exposed to light through the platen and the transfer sheet. At this time, some of the light is also absorbed by the transfer sheet, especially the ink film wax layer, and generates heat, which is used as a thermal bias. The image area 81 on the document generates heat due to light absorption, and this heat is transmitted to the wax layer through the base of the ink film and melts the wax. The melted wax is fused to the intermediate transfer body 71, and when the device 1 is removed and both films 71 and 72 of the transfer sheet are peeled off, the intermediate transfer body 71
A wax image corresponding to the image area of the original is obtained. This image is a normal image when viewed from the intermediate transfer body side, and you can use this film as it is as a copy image, or paste it on a notebook etc. if necessary. It depends on the spectral characteristics of the sheet etc. and the emission characteristics of the lamp, but it also depends on the type of document. For example, line images using pigments such as carbon or long wavelength absorption colors require low energy, but dye-based ones require less energy. High energy is required for colorants and long wavelength reflective colors. Furthermore, if more energy than necessary is applied, the periphery of the image may melt, resulting in poor sharpness, or the wax may flow due to surface tension, causing hollow spots in the image. Therefore, the charging energy for light emission is variable, for example, in the range of 0, 8 to 2, 5 Joule/ci. In addition, since the image on the intermediate transfer body obtained is heat-fusible, it can be printed on notebooks, notebooks, etc. using an iron or other heat source.
It is also possible to perform thermal transfer onto fabrics and the like. There is no problem with transferring to materials that can be impregnated with molten wax, such as paper and cloth, but when transferring to glass plates, plastic films, etc., applying heat and pressure with an iron, heated roller, etc. will cause the molten wax to transfer to the intermediate transfer. It leaks between the body and the transferred body and bleeds into the image. In such a case, flash exposure is still effective, and it is sufficient to stack the intermediate transfer members so that the ink image faces the transferred object, place the device 1 in the same manner as above, and emit light while applying pressure. However, in this case, since heat generated by light absorption of the wax layer itself is utilized, energy 1.5 to 2 times higher than in the above case is required, for example.

In the above-mentioned thermal transfer type copying device, on the surface to be exposed, heat is transferred through the film as described above, and melted wax is transferred from one surface to the other. Each must be in close contact with each other, and in order to improve the closeness, it is necessary to apply a certain amount of pressure to the surface to be exposed.

In the copying apparatus described above, if the copying apparatus is pressed from above at an angle, it is not possible to apply a uniform force to the pressing surface, and there may be protrusions, deposits, etc. on the exposed surface. If there was trash, etc., the area around it would be piled up, making it impossible to pressurize a single area.

Purpose The present invention was made in view of the above-mentioned circumstances.
In particular, in a copying device that places the copying device on a document and presses it to make a copy, even if the copying device is tilted and pressed from above, a single force is applied to the surface to be exposed. It was done for the purpose of

i-1 In order to achieve the above object, the present invention provides an exposure device for a copying machine comprising at least a flash light-emitting body and a frame containing the flash light-emitting body. It has a bowl-shaped contact member with rubber elasticity that protrudes from the frame, and after the contact member is opposed to the surface to be exposed, the internal pressure of the contact member is increased by suppressing the copying device. This internal pressure is used to apply surface pressure to the surface to be exposed. Hereinafter, the present invention will be explained based on examples.

FIG. 1 is a block diagram of main parts for explaining one embodiment of the present invention, that is, a diagram corresponding to the light emitting part and platen part of the copying machine shown in FIG. 4, and FIG. II -I
This is a view seen from the I-line direction, and in the figure, 11°12 is copying device 1.
In the middle of the side plate 12, a light emitting section consisting of a xenon lamp 519, a reflector 52, etc. is attached to the side plate 13 and housed.

The platen part includes a transparent plate 61 fixed to the side plate (frame body) 12.
It consists of Reference numeral 63 denotes a belt-shaped pressure member made of a rubber elastic material and having a bowl-like cross section as shown in the figure and open at both upper and lower ends. The pressure member 63 is attached to the frame 12. This pressing member 63 has an accordion-like cross-sectional shape so that it is easily deformed when the copying device @1 is pressed. Note that the shape of the pressure member 63 may be widened downward as shown in the figure, or may be narrowed downward as shown in FIG. 3, which makes alignment with the surface to be exposed easier. Become.

At the time of copying, the pressure member 63 is attached to the lower end (exposure section) of the copying device 1, placed on the surface to be exposed, and when the copying device 1 is pressed from above, the contact surface 63a comes into close contact with the surface to be exposed, When pressure is applied further, the air pressure inside the area surrounded by the pressure member 63 and the transparent plate 61 rises, and this rise in air pressure can press the surface to be exposed. 8 can be ensured.

Effect 2 As is clear from the above description, according to the present invention, even when pressing the copying device from above, even if the pressure is tilted, it is possible to apply uniform surface pressure to the exposed surface. , even if there are foreign matter or protrusions between the copy sheet and the original on the glass plate.

Compared to applying pressure using a plastic plate or the like, uniform surface pressure can be applied without any floating parts around the area.

[Brief explanation of drawings]

FIG. 1 is a block diagram of main parts of a copying apparatus to which an exposure device according to the present invention is applied, FIG. 2 is a view of FIG. 1 viewed from the n-■ line direction, and FIG. Sectional view showing a modification, No. 4
The figure is a partially cutaway perspective view for explaining an example of a portable copying device previously proposed by the present applicant, FIG. 5 is a side sectional view showing an example of a transfer sheet, and FIG. 6 is a transfer sheet FIG. 7 is a partially exploded perspective view of FIG. 9 for explaining how to use a copying apparatus to which the present invention is applied. DESCRIPTION OF SYMBOLS 1... Copying device, 2... Electrical control section, 3... Operating section, 4... Charging section, 5... Light emitting section, 6... Platen section, 7... Transfer sheet, 8...Manuscript, 11.12
...Side plate, 13...Intermediate plate, 61...Transparent plate, 6
3... Pressure member. Patent Applicant Ricoh Co., Ltd. 11th Flash Figure 2 Figure 3 Figure 6'3, Figure 4

Claims (1)

[Claims] In an exposure device of a copying machine that includes at least a flash light emitting body and a frame containing the flash light emitting body, a bowl-shaped contact member having rubber elasticity that engages with the frame and projects beyond the frame. After the contact member faces the surface to be exposed, the internal pressure of the contact member is increased by pressing a copying device, and this internal pressure applies surface pressure to the surface to be exposed. An exposure device for a copying machine characterized by: