JPS6076731A - Automatic optical device for double sides - Google Patents

Abstract

PURPOSE:To obtain a copied image having good quality even if an original is folded or wrinkled by providing two rolls traveling on platen glass in synchronization with the lamp carriage of an optical system disposed in a platen cover to the lower part of said carriage and bringing the original into press contact with the platen glass. CONSTITUTION:The original 7 is subjected to exposure while the original is brought into press contact with the surface of the platen glass 2 by the rolls 9, 10 for retaining the original provided below the lamp carriage 6 when an exposing lamp 4 travels toward the left in the case of copying the top surface of the original 7 on the glass 2 by using the optical system in the upper part. No deviation in the focal length of the optical system is produced even if the original 7 is folded or wrinkled. An exposing lamp 12 projects light to the bottom surface of the original 7 and thus exposes the original while the lamp disposed below the glass 2 is traveled toward the right together with a mirror 13 by the lamp carriage in the case of copying the bottom surface of the original on the glass 2.

Description

[Detailed description of the invention]

(Industrial Field of Application) The present invention relates to an optical device for automatic duplexing of a copying machine. (Prior art) Optical device in conventional copying machine

[It is placed under the platen glass of the copying machine body, and it projects light onto the original image placed on the platen glass, and uses mirrors, lenses, etc. to reflect the reflected light. When copying the screen of a document using a copying machine configured to irradiate the photoreceptor with electrostatic radiation and form an electrostatic latent image on the surface of the photoreceptor, After copying one side of the original σp, it must be turned over on the platen glass and the remaining one side must be copied, so the number of original sheets ζ
In order to avoid this, the optical device was
This is a copying machine that is not only placed under the platen glass but also inside the cover of the platen glass, and uses both optical devices to copy both sides of the original placed on the platen glass without having to turn the original over. Although it has been devised so far, in the case of this copying machine, when the optical device placed inside the platen cover copies the top surface of the original placed on the platen glass, the original is placed flat on the platen glass. If the document is not pressed, for example, if the document is folded or wrinkled, shine a light on the document,
When copying the reflected light, the folds and wrinkles cause the focal length of the optical system to be distorted, resulting in distortions and blurring in the final copy image. (Object of the Invention) The present invention has been made in order to eliminate the drawbacks that occur when copying both sides of an FA sheet in the above-mentioned conventional copier. When copying the top surface of a document placed on a platen glass using the upper optical system placed on the platen glass, even if the original has folds or wrinkles, the light from the exposure lamp shines on the original and then the mirror. The object of the present invention is to provide an automatic double-sided optical device for copying machines, etc., in which the point where the reflected light image is projected is kept in pressure contact with the platen glass at all times, thereby preventing deviations in the focal length of the optical system. This is what I did. (Structure of the Invention) For this purpose, the present invention connects two rolls that run on the platen glass in synchronization with the lower part of the lamp carriage of the optical system disposed in the platen cover, and the rolls move the platen glass by the rolls. The original placed at a predetermined position 14 is pressed against the surface of the glass, the exposed part is illuminated with light from an exposure lamp, and the reflected light image is reflected on the mirror. (Embodiment) The present invention will be described in detail below based on an embodiment shown in the drawings. FIG. 1 is a schematic configuration diagram showing one embodiment of the automatic double-sided optical device of the present invention, and FIG. 2 is a side view showing one embodiment of the lamp carriage portion of the same. In the automatic duplexing optical system, the upper optical system includes a platen cover 3 placed on the platen glass 2 of the copying machine main body 1.
The inner surface of the is made black, and the exposure lamp 4 is installed inside it.
The mirror 5 is arranged so as to be able to scan the platen glass 2 in the direction shown by the dotted line on the left side of the figure using a lamp carriage 6, so that the light projected by the exposure lamp 4 is placed on a predetermined position 16 on the platen glass 2. fM, the reflected light hits the upper surface of the original 7, and the reflected light travels horizontally to the left in the figure via the mirror 5, and a fixed mirror 8 is placed at an appropriate position for the reflected light to travel. The reflected light from the mirror 5 is transmitted through the platen glass 2 so as to be connected to the lower optical system disposed below the platen glass 2. On the other hand, below the lamp carriage 6, two document holding plates 9.10 are connected using a support plate 11, etc., and these document holding plates 9.10 are synchronized with the lamp carriage 6. The light projected by the exposure lamp 4 hits the original 7 on the platen glass 2 and travels on the platen glass 2 at a certain interval.
Make sure that it does not block the reflection when it is reflected. On the other hand, the lower optical system is the same as before with the platen glass 2.
The lower surface of the exposure lamp 12 and the mirror 13 are arranged so that they can be scanned in the horizontal direction in the figure in synchronization by a lamp carriage (not shown), and the light projected by the exposure lamp 12 is placed on the platen glass 2. The reflected light hits the lower surface of the original 70 that has been exposed and is directed horizontally to the left in the figure by the mirror 13, and mirrors 14 and 15 are arranged vertically relative to each other at appropriate positions of the traveling light. The reflected light from the mirror 13 is polarized vertically downward by the mirrors 14 and 15, and then is allowed to travel in the horizontal direction on the right side of the figure via the lens 16, and the traveling light has an upper and lower relative direction. Mirrors 17 and 18 are placed at The configuration is such that an electrostatic latent image is formed on one surface of the photoreceptor 20 by irradiating it from the irradiation mirror 19 arranged previously. When the upper optical system is used to copy the surface of the original 70 on the platen 2, and when the lower optical system is used to copy the lower surface of the original 7, the lens 16 of the lower optical system is Since there is a difference in the focal length of the lens 16, two lenses with different focal lengths are prepared, and these are switched by an appropriate +stage in synchronization with the switching of the upper and lower optical systems. Make sure you can get it. The present invention is constructed as described above. Next, its operation will be explained. First, use the upper optical system to position the platen glass 2 at a predetermined position 16. When copying the top side of the original 7 placed on the
When the exposure lamp 4 moves to the left in the figure without projecting light, the document 7 is pressed onto the platen glass 2 by a document holding lever 9.10 provided below the lamp carriage 6. Then, light from the exposure lamp 4 is projected onto the press-contact portion between the document holding rolls 9 and 10, and the reflected light travels through the mirror 5 to the fixed mirror 8 on the left in the figure. From there, it is delivered to the lower optical system under the platen glass 2. At this time, the lower optical system is stopped at the position shown by the solid line in the figure, and the reflected light passes from the fixed mirror 8, through mirrors 13, 14, and 15, through the lens 16, and further through the mirrors 17 and 18. , irradiation mirror 19
The light is irradiated onto one surface of the photoreceptor 20. On the other hand, when the lower surface of the document placed on the platen glass 2 is exposed by the lower optical system, the exposure lamp 12 placed under the platen glass 2 is moved along with the mirror 13 by a lamp carriage whose rotation is omitted. The light is projected onto the lower surface of the document 7 while moving toward the center right, and the reflected light is reflected from the mirror 13 to the mirror 14. At this time, the mirror 14 moves in the direction shown by the dotted line on the left side of the figure together with the mirror 15 below it, polarizes the reflected light from the mirror 3 vertically downward and proceeds to the right side of the figure. The light is emitted and reflected onto a mirror 17 provided on the right side of the light through a lens 16. At this time, since the focal length of the lens 16 is different from that when the upper optical system is used,
Switching is performed in advance using a lens with a matching focal length and an appropriate automatic switching means. Then, the lens 1
The reflected light that has passed through +1 mirror 17 and the mirror 18 below it move to the right as shown by the dotted line in the figure, polarize the light in the vertically downward direction, and then are recovered horizontally to the left. The irradiation mirror 19 provided at the return destination irradiates one surface of the photoreceptor 20 and forms an electrostatic latent image on the surface, as in the case of using the above-mentioned upper optical system. (Effects of the Invention) The present invention is configured and used as described above, and when the upper optical system is used in the automatic duplexing optical device, the original 7 placed on the platen glass 2 is Two original ps provided below the lamp carriage 6
- Orientation on platen glass 2 according to rule 9.10,
Since the point to be reflected on the mirror 5 is placed in close contact with the mirror 5, even if the original has folds or wrinkles, it will remain flat on the platen glass 2 during copying. Therefore, these folds and wrinkles do not cause deviations in the focal length of the optical system, and the resulting copy image is always of good quality. have

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing one embodiment of the automatic double-sided optical system Vt of the present invention, and FIG. 2 is a partially enlarged side view of the lamp carriage portion of the upper optical system. In the figure 1... Copying machine main body, 2... Platen glass, 3
...Platen cover, 4...Exposure lamp, 5...Mirror, 6゛...Lamp carriage, 7...Original, 8.
・Fixed mirror, 9.10 ・Document holding roll,
11... Support plate, 12... Exposure lamp, 13.14
．． 15...Mirror, 16...Lens, 17.18.
... Mirror, 19 ... Irradiation mirror, 20 ... Photoreceptor.

Claims (2)

[Claims] (1) In an optical device configured such that an optical system is arranged both inside the copying machine main body and inside the platen cover, so that double-sided copying can be performed without turning over the 71it Na placed on the platen glass of the copying machine main body. The upper optical system disposed within the platen cover includes a p-type light beam that runs on the platen glass in synchronization with the movement of the exposure lamp and mirror.
An automatic duplexing optical device characterized in that an appropriate number of bars are arranged, and the spots of the document placed on the platen glass are brought into pressure contact with the upper surface of the platen glass. . (2) In addition to the lens matched to the focal length of the lower optical system, a lens matched to the focal length of the upper optical system is also placed in the location where the lenses of the lower optical system arranged inside the copying machine body are arranged. And these things 71'
1 above, characterized in that it can be switched according to the use of the optical system.
Optical device for automatic duplexing as described in Section 1.