JPH03240361A - Original reader - Google Patents

Abstract

PURPOSE:To simultaneously read a picture on both sides by arranging a close contact image sensor to one side of an original carrying path and arranging a reduction optical CCD linear image sensor onto the other side so as to have only to pass an original to be read through them. CONSTITUTION:A picture is printed out on both sides of an original 21 to be read and loaded into a carrying path from a loading port 18 and the picture on both sides is simultaneously read by having only to carry the original by rollers 23, 24. In this case, the picture on the lower sides of the original 21 is read by the reduction optical CCD linear image sensor 27 and the picture on the upper side is read by the close contact image sensor 25.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to document reading devices such as facsimiles and scanners.

BACKGROUND TECHNOLOGY In general, document reading devices that read images of documents are:
There are those using a contact type image sensor shown in FIG. 2 and those using a reduction optical system type C-CD linear image sensor shown in FIG.

First, in FIG. 2, a document conveyance path 5 is formed inside a main body case 1 of a facsimile or the like, and is provided with a plurality of conveyance rollers 3 and 4 for conveying a document 2 to be read. A contact type image sensor 6 is disposed in contact with the upper surface of the original document 2 to be read. The image is read by the contact type image sensor 6 by passing the original to be read 2 through the original transport path 5 with the read image portion facing upward.

In addition, in FIG. 3, a document transport path 9 is formed in the upper part of the main body case 7, in which two pairs of transport rollers 8 are arranged at a constant interval, and between the transport rollers 8 A reduction optical system type CCD linear image sensor 11 having a reading section for reading an image of the original to be read 10 is disposed below the original transport path 9 . This reduction optical system CCD linear image sensor 11 includes a light source 12 , mirrors 13 , 14 , a lens 15 , and a CCD linear image sensor 16 .

Problems to be Solved by the Invention If the document to be read has images printed on both sides, such as a catalogue, the reading operation must be performed twice no matter which type of document reading device is used. .

Further, in the case of a document reading device equipped with an automatic document feeder, it is necessary to copy one of the front and back sides of the document to be read using a copying machine in advance and divide the document into two documents.

Means for Solving the Problems A document conveyance path for conveying the document to be read is formed, a contact type image sensor is disposed on one side of the document conveyance path, and a reduction optical system type CCD linear sensor is disposed on the other side of the document conveyance path. An image sensor was installed.

Since there are document reading means on both sides of the document transport path, images on both sides of the document can be read simultaneously by passing the document once.Furthermore, contact image sensors are expensive but compact in size. Yes, reduction optical system type CCD
Linear image sensors have the characteristics of being large in size but low in price, and a contact type image sensor is placed above the document conveyance path, and a reduction optical system type CCD is used.
By arranging the linear image sensor below the document transport path, the document transport path can be positioned above the main body case, making it easy to open the document transport path. It is possible to create a device that is easy to handle in the event of a jam, and since the contact type image sensor faces downward, dust does not accumulate on the contact type image sensor, and good reading conditions can be maintained for a long period of time. It is something that can be done.

Example An embodiment of the present invention will be described based on FIG.

First, a main body case 17 is provided, and this main body case 17
A document transport path 20 is provided in which a document insertion port 18 is formed on the top surface and a document discharge port 19 is formed in the front surface. A receiving plate 22 for receiving the original to be read 21 and a transport roller 23 located above the receiving plate 22 are provided approximately in the middle of the document transport path 20 .

Further, a conveyance roller 24 is provided which is spaced apart from the conveyance roller 23 by a certain distance and contacts the lower surface of the document to be read 21, and a contact type image sensor 2 is mounted on the conveyance roller 24.
5 are arranged.

Furthermore, the reading unit 26 is positioned between the conveyance rollers 23 and 24, and the reduction optical system type COD linear image sensor 2
7 are arranged. This reduction optical system type COD linear image sensor 27 includes a light source 28, mirrors 29, 30, a lens 31, and a CCD linear image sensor 32.

In such a configuration, even if the original to be read 21 has images printed on both sides, the images on both sides can be read by simply inserting the original into the original transport path 20 from the original insertion opening 18 and transporting it by the transport rollers 23 and 24. Readings are done simultaneously. That is, the image of the lower surface of the original to be read 21 is read by the reduction optical system type CCD linear image sensor 27,
An image on the top surface is read by a contact type image sensor 25. Therefore, image reading of both sides of the original to be read 21 is performed extremely easily.

In addition, since the contact image sensor 25 is disposed above the document transport path 20 and its opening faces downward, dust does not accumulate on the opening and inside, ensuring good reading over a long period of time. It will be done. Furthermore, although the contact type image sensor 25 is expensive, it is compact in size and requires only a small storage space. Therefore,
The document conveyance path 20 can be located above the main body case 17. Therefore, when the document to be read 21 jams, it is necessary to open the document conveyance path 20, but it is possible to easily form an opening structure.

On the other hand, although the reduction optical system type COD linear image sensor 27 is inexpensive, it requires a considerable amount of space; however, by placing it under the main body case 17, there is no space problem. .

Effects of the Invention As described above, the present invention forms a document conveyance path for conveying a document to be read, a contact type image sensor is disposed on one side of the document conveyance path, and a reduction optical sensor is provided on the other side of the document conveyance path. Since a CCD linear image sensor is installed, there are document reading means on both sides of the document transport path, so images on both sides of the document can be read simultaneously by passing the document through once. Although the image sensor is expensive, it is compact in size and uses a reduction optical system C.
Although the CD linear image sensor is large in size, it is low in price.
By arranging the D linear image sensor below the document transport path, the document transport path can be positioned above the main body case, making it easier to open the document transport path. It is possible to form a device that is easy to handle when a document is jammed, and since the contact type image sensor faces downward, dust does not accumulate on the contact type image sensor, and the reading condition is good for a long period of time. It has the effect of being able to maintain the

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view showing an embodiment of the present invention, FIG. 2 is a partially cutaway side view showing a conventional example using a contact type image sensor, and FIG. FIG. 2 is a partially cutaway side view showing an example of the conventional technology using a reduction optical system type CCD linear image sensor. 20... Original transport path, 21... Original to be read, 25
...Contact type image sensor, 27...Reduction optical system type CCD linear image sensor

Claims (1)

[Scope of Claims] 1. A document conveyance path for conveying the document to be read is formed, a contact type image sensor is disposed on one side of the document conveyance path, and a reduction optical system type CCD is disposed on the other side of the document conveyance path.
A document reading device characterized by being equipped with a linear image sensor. 2. A contact image sensor is disposed above the document conveyance path, and a reduction optical system type C is installed below the document conveyance path.
2. The document reading device according to claim 1, further comprising a CD linear image sensor.