JPS639363A - Image reader - Google Patents

Abstract

PURPOSE:To miniaturize the image reader by making an image reading system in which a light source, an image forming lens and a reading element are unified rotatably, and thereby reducing the required space. CONSTITUTION:At the time of reading of a fixed original type, the original reading information face is placed to face downward between a transparent plate 2 and an original presser 3 and an image reading system 13 is moved from the starting position of reading A to the extent of reading B, and image information is read by a reading element 12 and converted and transmitted successively. At the time of reading of a moving original type, plural sheets of original placed with the reading information face facing downward making the upper face of the original presser 3 a tray are separated by a separating piece 4 and a separating roller 5 carried to the original reading position C by a paper feeding roller 6, and image information is read by the image reading system 13 and discharged through a paper discharge roller 7.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides image light from a document on a transparent plate to an image reading element (line type image sensor) via an optical imaging element.
This relates to an image reading device that reads an image of a document by forming an image on it, and in particular, a fixed document reading device that fixes the document on a transparent plate and reads the image by moving an optical imaging element, and a device that uses optical focusing. The present invention relates to an image reading device that can be switched to a moving original type reading device that reads images by fixing an image element and moving the original on a transparent plate.

[Conventional technology]

2. Description of the Related Art Conventionally, image reading elements have been proposed that can be used interchangeably in fixed document reading devices and moving document reading devices. This is a fixed document type image reading device equipped with an automatic feeding device so that sheet documents can be read continuously. An example of this is shown in FIG. 3.

In FIG. 3, reference numeral 1 indicates the main body of the reading device, and on the upper surface of the main body 1, a transparent plate 2 such as a plus plate and a document presser 3, which constitute a document table, are provided.

At one end of the document presser 3, a document conveyance system 9 consisting of a separation piece 4, a separation roller 5, a paper feed roller 6, a paper discharge roller 7, and a document feeder 8 is integrally provided. Below the transparent plate 2 is a light source 10. An image reading system 13 consisting of an imaging lens 11 and a reading element 12 is provided so as to be reciprocatable along the transparent plate 2.

When reading a fixed original, the original reading information side is placed face down between the transparent plate 2 and the original holder 3, the image reading system 13 moves from position A to position B, and the reading element 12 reads the image. It reads information, sequentially converts it into electrical signals, and transmits them.

On the other hand, when reading by a moving document type, the image reading system 13
is moved to position C and placed on the paper feed tray 14 with the original reading information side facing down.The multiple originals are separated by the separating piece 4 and the separating roller 5, and then the originals are read by the paper feeding roller 6. After the document is conveyed to the position and image information fr: is read by the image reading system 13 stationary below the reading position C, the document that is in contact with the document reading surface of the transparent plate 2 is placed at the tip of the id 8. The paper is scooped up from the original paper, cleaned by the document guide 8, conveyed to the paper ejection roller, and ejected to the paper ejection tray 15.

[Problem that the invention seeks to solve]

However, in such a conventional device, when reading a moving document, the entire image reading system 13 must be moved to the reading position C, which requires additional space to accommodate this movement. The whole thing is
This brings about the inconvenience of increasing the size.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an image reading device that can achieve miniaturization and is capable of reading both a moving original type and a fixed original type.

[Elaborate means to solve problems]

The present invention eliminates the drawbacks of the above-mentioned type of image reading device, and in order to prevent the overall size of the device from increasing in size, the transparent plate for the document fixed type and the transparent plate for the document moving type are provided on different planes, and the optical An image reading system including a target imaging element and an image reading element,
To provide an image reading device characterized in that switching between a document fixed type and a document moving type is performed by rotating two rotations about axes equidistant from the image forming points on the two transparent plates. It is something.

〔Example〕

The invention will now be described in detail with reference to the illustrated embodiments.

FIG. 1 shows an embodiment of the present invention, in which parts common to those shown in FIG. 3 are designated by the same reference numerals.

Reference numeral 1 indicates the main body of the image reading device, and on the top surface of the main body 1, there is a transparent plate 2 made of glass or the like that constitutes a document table in the case of a fixed document type.
A separation piece 4 , a separation roller 5 , and a paper feed roller 6 are provided at one end of the main body 1 . In the apparatus of the present invention, a transparent plate 2 for an original moving type is placed on a plane different from the transparent plate 2 constituting the original table in the above fixed original type (a plane perpendicular to the transparent plate 2 in the illustrated example). ' is arranged, followed by a paper discharge roller 7, and the separation piece 4, separation roller 5, feeding roller 6, and paper discharge roller 7 constitute a document conveyance system 9. Below the transparent plate 2 is a light source 10. An image forming lens 11 and a reading element 12 are integrally constructed, and a nine-image reading system 13 is provided. As shown in FIG. 2, the image reading system 13 is supported by a caliper 15 via a shaft 14, and the caliper 15 is movable back and forth along a shaft 16. Also, Calitub 1
5 is provided with a motor 17 , and the rotation of the motor 17 is transmitted via a googly 18 and a belt 19 to a googly 20 provided at the end of the shaft 14 , which rotates the image reading system 13 relative to the caliber 15 . It is configured so that it can be rotated.

When reading a fixed type document, the document reading information surface is trapped downward between the transparent plate 2 and the document holder 30, the image reading system 13 moves from the reading start position to the reading range B, and the reading element 12 moves to the image clearing position. It reads the information and sequentially converts it into electrical signals and sends them.

On the other hand, during scanning with the moving document type, the upper surface of the document presser 3 is used as a tray, and multiple documents placed with the information side facing downward are separated by the separation piece 4 and the separation roller 5, and then separated by the paper feed roller 6. The document is conveyed to the document reading position C by the image reading system 13, the image information is read by the image reading system 13, and the document is discharged through the paper discharge roller 7. At the start of reading, the image reading system 13 is rotated by 90 degrees around the shaft 14 so as to face the reading position Ci by the motor 17. axis 14
The center of the transparent plates 2 and 2 is at the reading start position A.
The image forming position of the image reading system 13 is configured to be equidistant from each image forming surface of the transparent plate 2' as it completes one rotation. It becomes possible.

Also, when the scanning of the document moving type is completed, motor 1 is turned off.
7 is rotated in the opposite direction to the above, the image reading system 13 is returned to its original position, and the original can be read in a fixed manner.

It goes without saying that the configuration of the shaft 14 and the reading start position device A is such that the rotation of the image reading system 13 is not hindered and the size of the main body 1 is made as small as possible.

In the above embodiment, the rotation amount of the image reading system 13 was set at 90' due to the configuration of the transparent plates 2 and 2', but it goes without saying that it is possible to configure the image reading system 13 at other angles.

〔Effect of the invention〕

As explained above, the present invention provides an image reading device that can be used in a fixed original type and a moving original type, by integrating a light source, an imaging lens, and a reading element, and making it possible to rotate a mental image reading system. As a result, the required space can be reduced and the device can be made smaller.Also, by integrating the light source, imaging lens, and reading element to form a mental image reading system, there is no fluctuation in the optical path due to rotation, and the device can be made smaller. Furthermore, by configuring the center of rotation to be at the same distance from the image forming plane on each transparent plate, the image forming plane can be switched simply by rotating the image reading system. can.

Additionally, the document holder can be used as a paper feed tray for the document moving type.
Therefore, the external space can be used effectively.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of an image reading device according to the present invention, FIG. 2 is a perspective view of the image reading system shown in FIG. 1, and FIG. 3 is a conventional image reading device. FIG. 1...Reading device main body, 2, 2'...Transparent plate, 3
・・・Document holding, 4...Separation piece, 5...Separation roller, 6...Feeding roller, 7...Document ejection roller, 8...Document is in position, 9...Document transport system, 10... light source, 11... imaging lens, 12... reading element, 13... image reading system,
14...axis, 15...carry knob, 1
6...axis, 17...motor, 18...
Ghouli, 19...Belt, 20...Furi.

Claims (2)

[Claims] (1) When reading the original image by forming an image on the image reading element through image light from the original on the transparent plate, the image is read by fixing the original on the transparent plate and moving the optical imaging element. In an image reading device that can be switched between a fixed document type reader that reads an image and a document moving type reader that reads an image by fixing an optical imaging element and moving the document on a transparent plate, a transparent plate for a fixed document type is used. and a transparent plate for document moving type are provided on different planes, and the image reading system that integrates the optical imaging element and image reading element is placed equidistant from the image forming point on the two transparent plates. An image reading device characterized in that it can be switched between a document fixed type and a document moving type by rotating the device around an axis located in the image reading device. (2) The image reading device according to claim (1), wherein the image reading device is configured so that the document holder of the fixed document reading device can be used as a document feeding tray when used as a moving document reading device.