JPS6239839A - Image forming device - Google Patents

Abstract

PURPOSE:To form a well-focused image even when a bulky book having a sewing allowance is transferred by providing a transparent rotating cylinder rotating along the upper surface of an original placed upwardly and irradiating light from a light source disposed in the cylinder to the original. CONSTITUTION:A spring 4 acting as pushing up the original 1 is installed below a bottom plate 3 in a book cassette box 2. At the time of exposure, the original 1 and the book cassette box 2 move on a movable original platen in the direction of an arrow to read the original 1. At this time, the original 1 is irradiated by two light sources 5 installed in the transparent cylinder 17, while it is pressed by the cylinder 17 rotating at a velocity the same as the moving speed of the original platen, and the light reflected by the original is led to a photosensitive drum through a mirror 6. Since the irregularity on the original 1 moves in the same way as the reading part of the transparent cylinder 17 due to the pressure of the spring 4, a clear well-focused transfer image can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] In the present invention, a document is placed face up on a document table, the document is illuminated from above, and the reflected light is illuminated.

The present invention relates to an apparatus for forming an image by forming an image on an image support through an optical system, and particularly relates to an image forming apparatus suitable for copying a three-dimensional object, such as a document having a binding margin, such as a book.

[Background of the invention]

In conventional image forming devices such as copying machines, an original is placed face down on a glass platen, a light source placed under the platen glass illuminates the original, and the reflected light is transmitted to an optical system. Generally, the structure is such that one image is formed by forming an image on an image support through the image support. However, this image forming method
When copying a three-dimensional object, especially a book with a binding margin, there is the hassle of pulling the book over and over again each time you copy a page, turning the page again, or flipping it over to copy. It had the disadvantage that it was not suitable for copying certain books or valuable ancient documents that required careful handling.

In addition, since the depth of focus is shallow near one binding margin, a phenomenon occurs where the book is out of focus, and in order to prevent this, the book is pressed down, which causes a problem in that the book is seriously damaged.

[Purpose of the invention]

An object of the present invention is to eliminate the drawbacks of conventional image forming apparatuses as described above, and also to provide a sharp and beautiful ms when copying three-dimensional objects, especially thick books with binding margins. An object of the present invention is to provide an image forming apparatus that can form images.

[Overview of the invention]

The image forming apparatus according to the present invention places a document facing upward on a document table, illuminates the document from above, and images the reflected light on an image support through an optical system to form an image fR.
f: The forming device [, rd, l on the top of the above document.
The present invention is characterized in that a transparent rotating cylinder is provided which rolls around in the cylinder, and a document illumination light source is disposed within the cylinder, thereby reading the document.

[Embodiments of the invention]

The illustrated embodiment will be described below.

! 1 and 2 are cross-sectional views of a three-dimensional object copying apparatus showing one side of the present invention.

1 is a manuscript.In this example, the case of a book will be explained. 2 is a book cassette box for storing manuscripts.

Inside the book cassette box 2, there is a push spring 4 inserted through the bottom plate 3 to push up the original 1 (see Figure 2).
.

The book cassette box 2 is placed on a movable document table (not shown), and during exposure, the book cassette box 2 moves together to read the document 1.

A light source 5 such as a fluorescent lamp or a halodan lamp is used to illuminate the original. Two light sources 5 are used to illuminate the document from both directions so that folds and shadows on the document are not copied. As a light source, it is preferable to use a fluorescent light in this apparatus because it is closer to the surface light source and less likely to cast shadows on the document than a halodan lamp.

The nine rays of light reflected by the original are reflected by a mirror 6, pass through a lens 7 on the way, and are projected onto a photosensitive drum 8. The photosensitive drum 8 is uniformly charged in advance by a corona charger 9, and by the light passing through the aforementioned optical path, the charge is removed only in the areas hit by the light, thereby forming a latent image.

After developing this latent image with the developing device 10, the cassette 1
Transfer charger 12 is supplied from 1 to 9 transfer paper (not shown).
The transfer belt 13 transfers the image to the fixing roller 14 where it is fixed, and the paper ejection roller 15 ejects the paper onto the paper ejection tray 16.

Generally, when copying a three-dimensional object such as a book, if the object is copied as is, the optical path length changes due to the unevenness of the surface and only a single copy image with a single focus is obtained.

To solve this problem, a method of copying by placing a glass plate on top of the original has been considered, but this method requires raising the glass plate and turning the pages every time you copy each page of the book. Workability is poor.Also, with a flat glass plate, even if you press it against the original with a certain amount of pressure, the original may not completely become a glass plate and the copied image may come off.A11) Press with strong pressure There was a risk that the manuscript would be damaged.

In order to solve these problems, the present invention uses a rotating transparent cylinder 17 in the reading section, and a light source 5 is installed inside the cylinder, and the original 1 is illuminated by the light source 5 while the original 1 is held down by this cylinder to read the original 1. It is characterized by

Figure 2 is a sectional view near the reading section, Figure 3 is A-A in Figure 2.
FIG.

A transparent cylinder 17 that holds the original rotates at the same circumferential speed as the moving speed of the original table while holding the original.

This transparent cylinder is made of glass or plastic (e.g. acrylic or polycarbonate) and has a light source 5.
The original is read by passing the light emitted from it. A slit 18 defines a constant reading width.

At this time, the curvature of the transparent cylinder 170 is set to a size that does not pose a problem in reading the original. 19 is a hood for the light source.

In the illustrated embodiment, as shown in FIG.
The transparent cylinder 17 is rotatably supported at both ends by the transparent cylinder 17, and sliding members 21 in contact with bearings 20 are bonded to both ends of the transparent cylinder 17 to ensure smooth rotation. Both ends of the light source 5 protrude outward from the bearing 20, and are connected to a power source via a connector 22.

In the above apparatus, the original 1 is illuminated by the light source 5 while being held by the transparent cylinder 17. In this way, the unevenness of the original 1 is changed to the transparent cylinder 17 by the pressure of the spring 4.
Since it moves in accordance with the reading p section, a clear copy image without "V" can be obtained.

Furthermore, when the original comes out after the second exposure, there is no glass or the like on top of the original to hold it down, so it is possible to copy a book just like turning the pages of a book during normal reading.

〔Effect of the invention〕

As described above, the present invention can produce a clear copy of the original image even in the case of a three-dimensional object, such as a book with a binding margin, which has unevenness on one surface.
It is possible to form images without having to perform troublesome operations such as flipping the book over and turning the pages each time you copy, or flipping it over and copying, as in the past. Copies can be easily made without fear of damaging heavy books or valuable ancient documents that require careful handling.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of an image forming apparatus according to the present invention, FIG. 2 is an enlarged view of a part thereof, and FIG. 3 is an A of FIG.
- It is a sectional view taken along the A line. 1... Manuscript, 2... Book cassette box, 3... Bottom plate, 4... Pressing spring, 5
...Light source, 6...Mirror, 7...
Lens, 8...photosensitive tram. 9...Corona charger, 10...Developer, 11.
...Cassette, 12...Transfer charger. 13... Conveyance belt, 14... Fixing roller, 1
5... Paper ejection roller, 16... Paper ejection tray. 17...Transparent cylinder, 18...Slit, 1
9...Hood, 20...Bearing, 21...
・Sliding member, 22... Connector, 23...
side plate.

Claims (1)

[Claims] The document is placed face up on a document table, the document is illuminated from above, and the reflected light is focused on an image support through an optical system to form an image. An image forming apparatus characterized in that a transparent rotating cylinder that rolls along the cylinder is provided, a document illumination light source is disposed inside the cylinder, and the document is read using the transparent rotating cylinder.