JPS6045234A - Reader printer - Google Patents

Abstract

PURPOSE:To uniform the illumination distribution of an electrophotographic sensitive member by interposing a partial light reducing means for reducing the light quantity of a prescribed exposure area on the way of an optical path. CONSTITUTION:A slide base 34 which slides so as to cross vertically an optical path extending from a copying projection lens 18 to a fixed reflector 19 along a fixed guide bar 35 is provided on a body placed right under the reflector 19. The bar 35 is provided with a lower side pressing coil spring 36 of the base 34. A conversion lens 38 positioned right under the reflector 19 at the time of projection, and a partial light reducing filter 39 positioned right under the reflector 19 at the time of copying are placed in parallel on the base 34. The lens 38 enlarges and projects a picture of a microfilm, and the filter 39 reduces a light about 15% with respect to the part of about 40% of the rear part of an electrophotographic sensitive paper whose gap to a copying reflector is narrowed, comparing with other part.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a league printer for ilms, and is intended to achieve uniform copying exposure over a period of time.

It is known as a device that enlarges and projects image information recorded on microfilm in the form of a roll, fish, aperture card, jacket, etc. onto a projection screen or copies it on a transfer medium such as paper. League printers are common, and most printers generally use electrophotographic photoreceptors. In order to reduce the size, weight, and cost of this league printer, a model has been developed in which a single copying projection lens serves as both a projection lens and a copying lens, and the light source is also integrated into one. . As shown in FIG. 1, which schematically shows the structure of an example of such a conventional printer, a lamp chamber 2 formed at the front of the upper end of the main body 11 includes a light source 13 and a light source 13 that directs the light upward. A film operation space 16 in which the microfilm I5 is positioned is formed at the front of the lower part of the main body 11. A part of the condensing lens 17 that guides the light from the light source 13 to the microfilm 15 is connected to the film operation space 16.
is fixedly installed directly above the reflecting mirror 14 so as to protrude from the side,
An optical path is connected to the main body 11 above the copy projection lens 18 which faces this condensing lens 17 while sandwiching the microfilm 1'5.
A fixed reflecting mirror 19 that can be bent backward is fixedly installed in an inclined state. Behind the fixed reflecting mirror 19, the optical path from the fixed reflecting mirror 19 is directed to the side of a projection screen 20 formed on the front surface of the main body 11, or to an electrophotographic photosensitive paper 20 formed at the rear of the lower part of the main body 11. A rotating shaft 23 on which a switching reflector 22 for switching to the exposure section side is attached to the main body 11.
It is arranged rotatably at the center, and furthermore, the 1st reflecting mirror 1
A copying reflecting mirror 24 for bending the optical path from the photosensitive paper 9 toward the base of the electrophotographic photosensitive paper 2i0) is fixedly installed in an inclined state.

Further, above the switching reflector 22, the optical path from the defining reflection ji 419 is connected to the projection screen 2 via the switching reflector 22.
A projection reflector 25 that is bent toward the 0 side is fixedly installed.
It was previously installed in an electrophotographic camera that could be driven intermittently by a drive device (not shown). Note that this structure is the same for the transfer medium link.

By the way, as league printers become smaller, the optical path length from the microfilm 15 to the projection screen 20 and the electrophotographic paper 21' has to be inevitably shortened. will be placed in extremely close proximity to. Therefore, due to the influence of diffused reflection on the surface of the electrophotographic paper 21, the copying reflector 24
The illuminance of the rear part of the electrophotographic paper 21 (the part on the right end side in the figure) which is close to ζ increases, resulting in a defect F in which the image in this part becomes blurred.

This drawback is due to the fact that the electrophotographic photosensitive paper 2 has a diffusely reflecting surface because it is coated with zinc IV chloride, etc. rather than the electrophotographic photoreceptor.
It is often noticeable in case 1.

In view of the deterioration in the quality of copied images caused by uneven illuminance in conventional printers, the present invention makes it possible to realize a uniform illuminance distribution even when a copying reflecting mirror is placed close to electrophotographic photosensitive paper or an electrophotographic photoreceptor. Aims to provide league printers.

The configuration of the first glue printer of the present invention that uses electrophotographic photosensitive paper and has an electrophotographic copying device to achieve this purpose is to project image information that is taken into the main body and recorded on microfilm. A large copy projection lens,
a projection screen attached to the main body and onto which the enlarged image information is projected; an electrophotographic paper housed in the main body and onto which the enlarged image information is exposed; an electrophotographic copying device that fixes a toner image of image information; a switching reflector that is attached to the main body and switches the optical path from the copy projection lens to the projection screen side or the electrophotographic photosensitive paper side; , a copying reflecting mirror installed in the main body in a tilted state with respect to the electrophotographic paper; and a copying mirror interposed in the optical path to the electrophotographic paper, the copying mirror being interposed between the electrophotographic paper and the copying paper. This device is equipped with partial light attenuation means for reducing the amount of light in the exposure area on the side closer to the mirror. Further, the configuration of the second reader printer of the present invention, which is equipped with an electrophotographic copying device having a transfer process, includes a copy projection lens attached to a main body and for enlarging image information recorded on a microfilm; a projection screen attached to and on which the enlarged image information is projected;
an electrophotographic photoreceptor that is movably attached to the main body and to which the enlarged image information is exposed; and an electrophotographic copying device that fixes a toner image of the image information to a transfer medium via the electrophotographic photoreceptor. a switching reflector that is attached to the main body and switches the optical path from the copying projection lens to the projection screen side or to the electrophotographic photoreceptor side; Light from an exposure area that is interposed in the optical path to the attached copying reflecting mirror and the electrophotographic photoreceptor, and where the distance between the electrophotographic photoreceptor and the copying reflecting mirror is closer! t
and partial dimming means for reducing the light intensity.

Hereinafter, an embodiment in which the present invention is applied to a league printer shown in FIG. 1 having a built-in conversion lens switching device will be described in detail with reference to FIGS. 1 to 5.

As shown in FIG. 2, which shows the structure of the switching reflector, and FIG. 3, which shows a cutaway view of the left side shape of the switching reflector, a rotating shaft 23 is rotatably mounted on a frame plate 26 that is integral with the main body 11. A frame 27 supporting the switching reflector 22 is integrally fixed to the frame 20.
A wire 29 is connected to a drive source (not shown) as f fr , fi, and is normally brought into contact with a stopper 30 by the weight of the frame 27 and the spring force of a compression coil spring, which will be described later. However, during copying, the driving source is actuated by an operation switch (not shown) to pull the wire 29, so that the frame 27 is pulled up to the position shown by the two-dot chain line in the figure. Said rotation 1
A swinging lever 31 is integrally attached to the 1%l+ 23, and a wire 32 whose one end is connected to the swinging lever 31 is wound around a direction changing roller 33. It is connected to a slide base 34 which will be described later.

As shown in FIG. 4 showing the enlarged groove structure of the fixed reflector 19 and FIG. The O guide bar 35 on which the aforementioned slide base 34 is mounted, which slides in a direction perpendicularly crossing the optical path from the copying projection lens 18 to the fixed reflector 19 along the 1° (-35) angle of the provided guide. The slide base 34 is shown in FIG.

The above-mentioned compression coil spring 36 that always presses downward is passed through the coil, so that when the frame 27 is flipped upwards into the copying state, the swinging lever 31 integrated with the frame 27 is rotated clockwise in FIG. Since the slide base 34 rotates in the opposite direction and pulls the wire 32, the slide base 34 moves horizontally upward in FIG. 5 against the spring force of the compression coil spring 36.

In addition, the reference numeral 37 in the figure is a direction changing roller of the wire 32, and a conversion lens 38 is positioned on the slide pace 34 directly below the fixed reflecting mirror 19 during projection.
and a partial attenuation filter 39, which is positioned directly below the fixed reflecting mirror 19 during copying, are juxtaposed. Conno (-John lens 38 is microfilm 15K nli
This is for projecting the recorded image information onto the projection screen 20 by enlarging it to a greater extent than when copying, and the distance between the partial darkening filter 39 of this embodiment and the copying reflector 24 is narrowed. Approximately 40% of the rear part of the electrophotographic paper 21 (the right side in Figure 1) is separated from the other parts by approximately 15%.
It has a structure that reduces light. Note that the light attenuation area and light attenuation rate of the partial light attenuation filter 39 can be set as appropriate, or can be used as the light attenuation rate changes steplessly. In addition, when using a simple partial light shielding plate, etc., it is better to interpose it between the light source 13 and the condensing lens 17 so that the boundary of the light shielding part is not noticeable. It is not possible to reduce the brightness even in the . Furthermore, as another partial light reduction means, it is also possible to reduce the reflectance of the copying mirror 24 on the side closer to the electrophotographic photosensitive paper 21.

In this embodiment, by arranging the conversion lens 38 and the partial dark filter 39 side by side, when the brightness of the light source 13 cannot be adjusted, the overall density of the partial dark filter 39 can be increased to prevent excessive brightness during copying. This has the advantage of being able to prevent the problem from becoming too dark during projection. However, from the point of view of the present invention, the conversion lens 38 may not be provided, and may be simply a hole. or,
In this embodiment, the slide base 34 is moved by the wire 32 in conjunction with the switching reflector 22, but it is also possible to use other known driving means to change the reflectance of the copying reflector 24. In this case no special drive means are required.

As described above, according to the reader printer of the present invention, the distance between the midway K of the first path (to the electrophotographic photosensitive paper or the electrophotographic photosensitive member) and the copying reflecting mirror positioned at an angle with respect to these is Since a partial light attenuation means is provided to lower the light percentage of the nearby exposed area compared to other exposed areas, the illuminance distribution of the Y4 body on the electrophotographic paper or the electrophotographic window is made uniform and good. This makes it possible to make accurate copies, and further promotes miniaturization of league printers.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing the 41° 4 structure of a conventional reader printer, Fig. 2 is a conceptual diagram of the switching reflector portion of an embodiment of the league printer of the present invention, which is an improved version of this, and Fig. 3 is its sectional view. 4 is a conceptual diagram of the fixed reflector portion, and FIG. 5 is a sectional view taken along the V-■ arrow. In the figure, 11 is the main body, 13 is the light source, 15 18 is a microfilm, 18 is a copy projection lens, 19 is a fixed reflector, 20 is a projection screen, 21 is electrophotographic paper, 22 is a switching reflector, 24 is a copying reflector, 25 is a projection reflector, 29. 32 is a wire, 31 is a swing arm, 34 is a slide base, 35 is a guide bar, 36 is a compression coil spring, 38 is a conversion lens, and 39 is a partial dark filter. Figure 1 Figure 3 Procedural Amendment - 11: March 1980/] 90 Patent 11'1 Dear Commissioner 1, Indication of Matters 1988 Patent Application No. 152561η Showa Year Review
Judgment No. 2, Name of the invention Relationship with "Person who closes the reader printer 3111" +11!l Patent applicant Fuji Photo Film Co., Ltd. (520) Nakanuma 210 Joji, Minamiashigara City, Kanagawa Prefecture (1 other person) 4
Agent postal code 107 6. In Column 7 of “Detailed Description of the Invention” of the specification subject to amendment, in the 8th line from the bottom of page 1θ of the specification of contents of the amendment, “largely enlarged” and “enlarged” "Reduction" is corrected. (That’s all) ゛−

Claims (1)

[Scope of Claims] (A copying projection lens attached to a main body and magnifying image information recorded on a microfilm; a projection screen attached to the main body and onto which the enlarged image information is projected; an electrophotographic paper that is housed in the main body and to which the enlarged image information is exposed; an electrophotographic copying device that fixes toner 1 of the image information to the electrophotographic paper; a switching reflector for switching the optical path from the copying projection lens to the projection screen side or to the electrophotographic paper side; and a copying reflector installed in the main body in an inclined state with respect to the electrophotographic paper. A reader printer comprising: a mirror; and partial light attenuation means interposed in the optical path to the electrophotographic paper, and which takes the electrophotographic paper and the copying mirror. a copying projection lens for enlarging the image information recorded on the film; a projection screen that can be attached to the main body and on which the enlarged image information is projected; an electrophotographic photoreceptor to which image information is exposed; an electrophotographic copying device that fixes a toner image of the image information to a transfer medium via the electrophotographic photoreceptor; a switching reflector that switches the optical path from the projection lens to the projection screen side or the electrophotographic photoreceptor side; a copying reflector installed in the main body in an inclined state with respect to the electrophotographic photoreceptor; A reader printer comprising a partial light attenuation means interposed in an optical path 9 to the electrophotographic photoreceptor and reducing the amount of light in an exposure area on the side where the distance between the electrophotographic photoreceptor and the copying mirror is closer.