JPS58142665A - Original reader - Google Patents

Abstract

PURPOSE:To read parts near the binding margin of book-type originals without a strain to damage them, by making the original placing plate to have a roof- shaped form and installing a reading means to both slopes of the roof-shaped placing plate. CONSTITUTION:An original placing plate 1 having a roof-shaped form is installed on an original reader. When a book-type original 2 is read, the original 2 is put on the original placing plate 1 so that the original 2 is extended over the two slope portions 1a and 1b of the original placing plate 1. The slope portions 1a and 1b are composed of a transparent plate, such as glass plate, etc., and lighting light sources 4a and 4b, lenses 5a and 5b, and light-to-electric signal converting elements 6a and 6b are installed below the slope portions, respectively. The light sources 4a and 4b lighten the original 2 while they are moving and reflected lights from the original form images in the elements 6a and 6b through the lenses 5a and 5b to converte the images into electric signals.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a document reading device for an image forming apparatus such as a copying machine or a facsimile machine, and particularly to a document reading device that can be advantageously used for reading book-shaped documents.

Conventionally, this type of document reading device has a flat document placing table, and is configured to read the document by placing the document flat thereon. Therefore, when transmitting a book-shaped original by facsimile, for example, it is necessary to first copy the book-shaped original to create a sheet-shaped original and then transmit this by facsimile. There are also models that can directly handle book-type originals, but because the original table is configured in a horizontal plane,
When using a book as a manuscript, the book must be opened wide and pressed firmly from the top, which can easily damage the book. The letters may become distorted. The same thing can be said when a book-shaped original is read by a copying machine.

The present invention eliminates the drawbacks of the conventional document reading device as described above, and when reading a book-shaped document, it is possible to read the document without damaging the book. The purpose of the present invention is to provide a document reading device that can read documents without distortion, and the document mounting table has a chevron shape, and both of the diagonally raised document portions of the document table can be read at the same time or each document portion can be read separately. It is characterized by being provided with a reading means for reading.

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 and 2 show an embodiment in which the present invention is applied to a facsimile machine. FIG. 1 is a sectional view of a document reading device according to the present invention, and FIG. 2 is a perspective view thereof. As shown in the figure, the document reading device is equipped with a document mounting table 1 having a chevron shape.
The book-shaped original 2 is placed on the two sloped portions 1a of the original mounting table 1 above.

Place it so that it straddles the lb. If necessary, use the document holder 3 to hold the document in place.

The sloped portions 1a and lb of the document table 1 are made of transparent plates such as glass, and a reading system is arranged below the sloped portions 1a and 1b to read the document portions on the sloped portions la and lb, either simultaneously or separately.

A first reading optical system that reads the document portion on the sloped portion lb includes an illumination light source 4a, a lens 5a, and an optical-1 difference signal conversion element (e.g., COD) 6a, and also reads the document portion on the sloped portion lb. The second reading optical system is
It includes an illumination light source 4b, a lens 5b, and a light-electrical signal conversion element (eg, CCD) 6b.

The illumination light source 4a+4b illuminates the document by moving in a direction perpendicular to the plane of FIG.
b, which is converted into an electrical signal by an optical-electrical signal conversion element. These lenses 5a, 5b and optical-electrical signal conversion elements 6a, 6b are connected to the illumination light source 4a,
It is fixed on the same movable table as 4b, and reads the original in the main scanning direction shown by arrow A in FIG. 2 in synchronization with the light source.
Moving in the sub-scanning direction (perpendicular to the surface in FIG. 1) shown by arrow B in FIG.

A data selector 7 is used to convert the left page and alternately into electrical signals. With this, it is possible to read and transmit information on the right page and the left page of the book during one scan of the reading optical system. ) This reading state is shown in Figure @3.

In FIG. 3, line Ll on the left page of the book.

L2. L3 .
3... are read by the second reading optical system, and the image information thereof is also sent to the data selector 7.

The data selector 7 has nine left and right electrical signal conversion elements 6.
The image information obtained at the same time is alternately selected and outputted to m and 6b.

FIG. 4 shows a modification of the document reading device shown in FIG. 3. In this embodiment, one U-shaped illumination light source 4 is provided in place of the two illumination light sources 4a and 4b in the embodiment shown in FIG. 3, so that the right and left pages are illuminated simultaneously. Since the other points are exactly the same as those shown in FIG. 3, detailed explanation thereof will be omitted.

The above embodiment shows a document reading device equipped with a reading optical system that simultaneously reads the left page and right page of a paperback type document, but the present invention is directed to an embodiment in which the left page and right page are read separately. It can be carried out in Such an embodiment is shown in FIG.

FIG. 5 shows an arrangement in which only the document portion on the slope portion lb of the slope portions it and 1b of the document table 1 is read. This is basically the same as the embodiment (5) above, but this is simplified and the slope portion lb
Illumination light source 4b and lens 5 for reading the upper document portion
b. Only a single reading optical system including an optical-electrical signal conversion element 6b is provided. This method of reading only the portion of the original on one of the sloped portions allows greater flexibility in the installation location of the reading optical system, especially the illumination light source, and allows better illumination conditions to be obtained. Furthermore, this method has advantages such as a simplified structure and an easy electrical circuit.

In addition, in FIG. 5, L indicates the effective reading width.

The document reading device according to the present invention is applicable not only to reading book-type documents but also to reading book-type documents. Such an embodiment is shown in FIG. Figure 6 (,)
6 is a perspective view of the document mounting table, and FIG. 6(b) is an end view thereof. In this embodiment, a document presser 8 similar to the one shown in FIG. 2 is provided on the sloped portion 1b of the document table 1 having a chevron shape, and a support 9 is provided to support the sheet document so that it does not slide down. provided. As shown in FIG. 6(a), the original document holder 8 can be rotated between an upright position as shown at 8' and a position in which the original is held down on the slope (6) portion 1b. When placing the sheet I/original IO on the document platform 1, the support 9 prevents the sheet I/original 10 from slipping off, and the document holder 8 holds the sheet I/original 10 on the slope portion lb of the table 1. Keep a dense layer on top. The original reading optical system is the same as that described above.

As explained above, the present invention makes it possible to read book-shaped originals without damaging them by using a chevron-shaped original +^ placing table, and furthermore, it is possible to read characters near the binding edge of the book without distortion. 3. To provide a document reading device capable of

[Brief explanation of the drawing]

1 and 2 are a cross-sectional view and a perspective view showing an embodiment of the document reading device according to the present invention, FIG. 3 is an explanatory diagram showing a reading state, and FIG. 4 is a cross-sectional view showing a modification of the document reading device Figures 5 and 5 are cross-sectional views showing other embodiments of the document reading device according to the present invention, and Figures 6 (-) and (b).
1 is a perspective view and an end view showing still another embodiment of the document placement table 1゜1...Document placement table 2...Book-shaped original 3...Document holder 4...Illumination light source 5
...Lens 6...Optical-electrical signal conversion element 7...Data selector 8...Document holder 9...
Document support 1o... Sheet-shaped document C;:
l]i I'l-, 'i4ni device (:, 4],; j

Claims (1)

[Claims] 1. An original reading device, characterized in that the original placing table has a chevron shape and is provided with reading means for simultaneously reading both original portions on the slopes of the original placing table or for reading each original portion separately.