JPS62112147A - Exposing device for copying device - Google Patents

Abstract

PURPOSE:To expand the using range of a copying device by varying the shape of a reflecting plate to expose the whole surface to be exposed approximately uniformly on one relative position and to expose the approximate center position of the surface to be exposed concentrically at another relative position. CONSTITUTION:Since the shape of the reflecting plate is variable, the whole surface to be exposed is approximately uniformly exposed at one relative position and the approximate center part of the surface to be exposed is concentrically exposed at another relative position. The reflecting plate 52 is constituted so as to be optionally rotated around an angular part 52' and always excited in an opening direction by a spring member 53. When the reflecting plate 52 is opened at its maximum, the inner surface 12' of an exposed frame body 12 is made a mirror surface. The reflecting plate 52 is opened/closed by the vertical movement of a lever member 54 and the lever member 54 can be vertically moved by loosening a handle 55 and fixed on the frame body 12 by clamping the handle 55. Even if energy higher than a set value is required, concentrical exposure is executed by changing the shape of the reflecting plate to execute copying.

Description

[Detailed description of the invention] outside of technology The present invention relates to an exposure device in a copying machine.

Electrophotographic copying machines such as the Carlson method are widely used, but the devices are large, heavy, noisy, and expensive. It is not suitable for making it portable or lowering the 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.

(n) In addition, a small copying device for plate making and printing using a flash bulb has been proposed, but the amount required to obtain a copy is often one or several copies, and the cost of one plate and the valve are Including the cost of lamps, etc., the unit cost of copying becomes extremely expensive, which is not practical. In addition, many of these plate-making and printing machines have the disadvantage that their structure requires that the original be in the form of a sheet, or that it must be a single-sided original.

(ui) Furthermore, in recent years, small digital copying machines that use a document reader and a recording printer have been proposed, 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 all of them are installed on the floor, desk-1-8, or a dedicated stand, and when you want to make copies, you have to I had to go to the place where the copy machine was kept.

In view of the above-mentioned circumstances, the applicant first filed the following.

It is easy to carry around and can be stored in a bag or pocket. We have proposed a portable copying machine that is small, very inexpensive compared to conventional copying machines, and has high quality copied images.

FIG. 5 is a partially cutaway perspective view for explaining an example of a portable copying device previously proposed by the present applicant. In the figure, 1 is a portable copying device; From the top of the device, there is an electrical control section 2 with electronic components installed on the board, an operation section 3 including indicator lamps, switches, etc. 4. A charging section mainly consisting of a capacitor that stores the light emission energy of the flash lamp. A light emitting section 5 consisting of a flash lamp 511, a reflecting plate 52, etc., a translucent platen plate 61 for bringing the original and the copy sheet into close contact, a translucent platen section 6 consisting of a translucent buffer member 62, etc. are arranged in a substantially laminated manner. ing.

FIG. 6 is a side sectional view showing an example of a transfer sheet suitable for use in the portable copying device, and FIG. 7 is a partially exploded perspective view. In the figure, 7 is a transfer sheet; is a wavelength-selective transparent and heat-melting material in which coloring agents such as dyes and pigments are dispersed on a transparent plastic film 71 which is an intermediate transfer member, and a base 72 similar to the transparent plastic film 71. It consists of an ink film 74 provided with a wax layer 73 in close contact with it, 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 an extreme example, a glass plate several thicknesses thick can be used as the intermediate transfer body, but the thickness of the film may vary depending on practicality (operability).

10 to 200 μm and even 40 to 6 o
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 the 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. 8 is a diagram for explaining a copying method when copying information (image area 81) on a document 8F using the copying device 1 and transfer sheet 7. The copy sheets 7 are stacked with the ink film side facing the original, and the copying apparatus 1 is placed thereon so that the platen portion 6 is in close contact with the copy sheets 7. The copying apparatus 1 is connected to a commercial 100V power source or a charging battery, and the flash charging capacitor is charged to a preset potential level.

Due to the weight of the device 1 and the pressure applied via the device 1, the platen portion and the copy sheet surface are pressed together. - Each of the originals is evenly pressed into close contact with each other. When the flash lamp trigger switch is turned on in this state, the flash lamp emits light and the original is exposed to light through the platen and the copy sheet. At this time, some of the light is also absorbed by the copy 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 member 71, and when the device 1 is removed and both films 71 and 72 of the transfer sheet are peeled off, a wax image corresponding to the image area of the original is obtained on the intermediate transfer member 71. This image is a normal image when viewed from the intermediate transfer body side, and this film may be used as a copy image as it is, or may be pasted on a notebook or the like as necessary. The energy of emitted light varies depending on the spectral characteristics of the platen, copy sheet, etc., and the light emitting characteristics of the lamp, but it also varies depending on the type of original9.For example, it is low in the case of line images using pigments such as carbon or long wavelength absorption colors. Energy is sufficient, but high energy is required for dye-based colorants and long-wavelength reflective colors. Also.

If more energy than necessary is applied, the periphery of the image will melt, resulting in poor sharpness, or the surface tension of the wax will cause it to flow, causing hollow spots in the image. therefore,
For example, the charging energy for light emission is 0.8 to 2.5
It is variable within the range of Joule/cJ. Furthermore, since the image on the intermediate transfer member obtained is heat-fusible, it can also be thermally transferred to notebooks, notebooks, cloth, etc. using an iron or other heat source. 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., heat and pressure with an iron, hot 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 bodies so that the ink image faces the side of the transferred body, 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.

The above-mentioned copying apparatus is normally used for uniform exposure over the entire surface, but when the temperature of the surrounding area or the wax layer is extremely low, or when the temperature of the document or the wax layer becomes extremely high due to normal use. There may be cases where higher energy than the set value is required, such as when the power is low or when the use is different from normal use.

In such cases, we were unable to respond due to lack of energy.

Purpose The present invention was made in view of the above-mentioned circumstances.
In particular, it was designed to make the shape of the reflector variable and to narrow the exposure area to perform concentrated exposure when exposure energy is insufficient, thereby expanding the range of use of the copying device. .

Structure In order to achieve the above object, the present invention provides a copying apparatus that includes a flash lamp and a reflector that substantially surrounds the flash lamp and performs simultaneous exposure of the entire surface, in which the shape of the reflector is variable, and one At one relative position, substantially uniform exposure is performed over the entire surface to be exposed, and at another relative position, concentrated exposure is performed centered approximately at the center of the surface to be exposed. Hereinafter, the present invention will be explained based on examples.

1 and 2 are main part configuration diagrams for explaining one embodiment of the present invention, that is, detailed views of the light emitting part and the platen part. The light emitting section includes a flash lamp 51, a reflecting plate 52, etc. housed in the frame 12, and the platen section houses a platen plate 61 and a transparent buffer member 62 having pressure elasticity. The reflector plate 52 is configured to be rotatable around a corner 52' as a fulcrum in order to change the convergence area of the light from the flash lamp 51, and is always biased in the direction of opening by a spring member 53. . The inner surface 12' of the frame body 12, which is exposed when the reflecting plate 52 is fully opened, has a mirror surface formed by vapor deposition of aluminum or the like. The opening and closing of the reflecting plate 52 is performed by vertically moving a lever member 54 that is vertically movably supported by the frame 12 and comes into contact with the reflecting plate 52. This lever member 54 can be moved vertically by loosening the knob 55, and by tightening it, the 6 reflectors are fixed to the frame 12. Made by vapor deposition.

Figures 3 and 4 are diagrams showing the state of the reflector and the illuminance distribution at that time, respectively; both (A> figure shows the state of the reflector, and figure (B) shows the illuminance distribution. .Thus, the third
FIG. 3(A) shows a state in which copying apparatus 1 is normally used, and a substantially uniform illuminance distribution is obtained over the entire bottom surface of the copying apparatus 1, as shown in FIG. 3(B). Note that the illuminance at both ends is slightly reduced due to light leakage to the outside, but this can be significantly improved by providing reflective members that also serve as light shields around the ends. As mentioned above, the discharge energy is variable, but if the density is extremely low or the document does not easily generate heat, there may be a case where the energy is insufficient. When lowered to the state shown in Figure 4 (A), Figure 4 (
As shown in B), although the exposed area becomes narrower, a higher amount of exposure can be obtained and the uses of the apparatus can be further expanded. In addition.

It will be easily understood that the levers 54 and the like for opening and closing the reflector shown in FIGS. 1 and 2 are for illustration purposes only, and the present invention is not limited to the illustrated embodiments.

As is clear from the explanation of ``Mugi-ichimai-kita'', according to the present invention, the shape of the reflector can be changed to perform concentrated exposure even when the use is different from normal use, that is, when high energy higher than the set value is required. Although the n-light region becomes narrower, the range of use of the copying device can be expanded6.

[Brief explanation of drawings]

FIG. 1 is a side view of the main part of a copying apparatus according to the present invention, FIG. 2 is a plan cross-sectional view, and FIGS. 3 and 4 show the state of the reflector when the shape of the reflector is changed, respectively. A diagram showing the illuminance distribution, FIG. 5 is a partially cutaway perspective view for explaining an example of a portable copying device previously proposed by the applicant, and FIG. 6 is a side sectional view showing an example of a transfer sheet. , FIG. 7 is a partially exploded perspective view of the transfer sheet, and FIG. 8 is a diagram 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, 12...
Frame body, 51...Flash lamp, 52...Reflector plate, 61...Platen plate, 62...Buffer member, 53...
...Spring member, 54...Lever member, 55...Knob. Patent applicant Ricoh Co., Ltd. Figure 1 Figure 2
Figure 3 Figure 4 Figure 5 Z G Figure 7 Figure 1 Sea 174

Claims (1)

[Claims] In a copying apparatus that has a flash lamp and a reflector that substantially surrounds the flash lamp and performs simultaneous exposure of the entire surface, the shape of the reflector is variable, and at one relative position, the entire surface to be exposed is exposed substantially uniformly. An exposure device for a copying machine, characterized in that, at one other relative position, concentrated exposure is performed centered on a substantially central portion of a surface to be exposed.