JP2000165617A - Image reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a sharp image without distortion and blackishness even at a filing part by placing a book original on a platen of an image reader without spreading the book original to its extreme horizontal posture. SOLUTION: The platen 3 of the image reader 1 is extended up to a position of a side plate 4 and an original D is read while the original D is depressed onto an edge 5 at its filing position D1. A mirror m1 of a full rate carriage 11 provided to a scanner 10 that is moved under the platen 3 is tilted by an angle θ1 so as to allow the scanner 10 can scan even at an edge of the platen 3. Thus, the scanner can read up to the edge of the original even when the carriage 11 is in the state of press contact with the side plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flatbed type image reading apparatus, and more particularly to an apparatus which facilitates positioning of a book original and facilitates image reading.

[0002]

2. Description of the Related Art In order to read an image on a document, a flat bed type image reading apparatus is generally used.
In this type of apparatus, a document is set on a flat platen so as to press the image surface of the document, and reading is performed by a scanner that reciprocates along the lower surface of the platen. In the scanner, a full-rate carriage that reciprocates along the length of the original along the lower surface of the platen and a half-rate carriage that moves in half the distance of the carriage are arranged in combination. Then, an image surface of the original is illuminated by a lamp provided on the full-rate carriage, reflected light from the image surface is reflected via a plurality of mirrors, and CC is transmitted through a lens.
An image is formed on a photoelectric conversion element such as D, and an optical signal is converted into an electric signal by the CCD and output.

When the image writing apparatus is provided in a facsimile apparatus, a signal for reading the original is transmitted via a telephone line, and the received facsimile apparatus outputs the signal as recording paper. When the image reading apparatus is provided in a copying machine, a copy can be made using a reading signal.

[0004]

Since the platen provided in the image reading device is a flat glass plate,
When a sheet-type original is set, the original easily comes into close contact with the platen surface, so that a clear read image can be obtained. However, when a document has a binding portion in the center, such as a book, the binding stitches rise, and there is a problem that reading is performed in a state where the entire reading surface of the document does not adhere to the platen. Then, there arises a problem that a read image of a portion which does not adhere to the upper surface of the platen becomes unclear, reduced, or darkened. Furthermore, when you open a book etc. to a horizontal state,
There is a problem that the spine portion may be greatly bent or damaged and the binding portion may be adversely affected.

An object of the present invention is to solve the problem of the conventional flat bed type image forming apparatus, in which the binding of a book original is positioned on a platen extended to the end of the apparatus, and the image surface is fixed. It is an object of the present invention to provide a device that can read a document in a flat state.

[0006]

SUMMARY OF THE INVENTION The present invention relates to an image reading apparatus that has a scanner that moves along the lower surface of a platen and reads an image of a document set on the platen. According to a first aspect of the present invention, an end surface of the platen is positioned up to a side surface of the apparatus, and a binding of a book document is set on an edge formed by an end portion of the platen and a surface on the apparatus side. And reading is performed. The invention according to claim 2 is characterized in that a carriage that moves along the lower surface of the platen and reads an image of a document is provided with a reading direction inclined to the edge side. Claim 3
The invention is characterized in that the side surface of the apparatus is an inclined surface, an edge formed by the platen is formed at an obtuse angle, and the carriage is configured to be movable to a position directly below the edge.

As described above, by opening the book binding so as to be positioned at the edge formed between the end of the platen and the side of the apparatus, the document surface to be read can be set flat. It is possible to clearly read the binding part.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of an image reading apparatus according to the present invention will be described with reference to the illustrated example. In the image reading apparatus 1 shown in FIG. 1, an end of a platen 3 disposed on the upper surface of the apparatus main body is disposed so as to protrude to a position of a side plate 4 of the main body, and the platen 3 disposed horizontally and The right-angled edge 5 is formed by the side plate 4 provided substantially vertically. Further, a scanner 10 is arranged on the lower surface of the platen 3 and the scanner 10 is mounted on the full-rate carriage 1.
1 and the half-rate carriage 13 are provided in combination. The full-rate carriage 11 is reciprocated within a range in which the entire surface of the document set on the platen can be scanned, and the half-rate carriage 13 is moved half the distance of the full-rate carriage by half, similarly to a scanner generally used in the related art. Driving is performed by the driving device (not shown) so as to reciprocate at a speed.

A lamp 12 and one mirror m1 are provided on a full-rate carriage 11 arranged on the scanner 10, and two mirrors m2 and m3 are arranged on the half-rate carriage 13 at a predetermined angle, so that the original The light of the irradiated lamp is reflected through the three mirrors,
An image is formed on the CCD 16 via the lens 15. In the mirror m1 disposed on the full rate carriage 11 in a general scanner, the inclination angle of the mirror m1 is approximately 45.
The reflected light in the direction perpendicular to the platen 3 is transmitted to the mirror of the half-rate carriage. On the other hand, in the present embodiment, the full-rate carriage 11 moves to the right side of the drawing,
Even in the state where the frame of the full rate carriage has almost reached the position where it comes into contact with the side plate, the vicinity of the binding D1 of the document D cannot be read.

The mirror m1 disposed on the full-rate carriage 11 can read the position of the binding D1 of the original when the frame of the full-rate carriage moves to a position where it contacts the side plate. The inclination angle θ1 of the reflection surface with respect to the optical path between the two mirrors m1 and m2 is set to a value smaller than 45 °. Therefore, the reflection angle at the mirror m1 is 90.
Since the reflection angle and the incident angle are equal to each other, the angle between the optical axis (incident optical axis) from the document image surface and the surface of the mirror m1 is also θ1. Now, the incident / reflection point A of the mirror m1
Focusing on, since the original image surface and the optical path between the mirrors m1 and m2 are parallel, extension of the optical axis from the original image surface and
The angle of the mirror m1 with respect to the reflected optical axis is also equal to θ. Is the sum of θ1 and the diagonal of the angle between the surface of the mirror m1 and the incident optical axis. As described above, since the angle between the surface of the mirror m1 and the incident optical axis is θ1,
As a result, the relationship θ = 2θ1 holds. When the angle of the reflected light from the image surface of the document is set to 60 °,
The tilt angle of the mirror m1 is 30 ° (= 60 ° / 2). Note that the inclination angle of the reflection surface of the mirror is not limited to the numerical value of the above example, and the document reading start position, the height of the frame of the full rate carriage 1, the position of the mirror, the position approaching the side plate of the full rate carriage, and the like. Are appropriately changed depending on the conditions described above.

In order to allow the full-rate carriage 11 to move to the side plate 4 of the main body frame for reading the image of the document D, a problem arises in a position where a pulley of a drive system is disposed with respect to the carriage. Therefore,
As shown in FIG. 2, projections 6 and 6a are provided on the rear side and the front side of the apparatus main body so as to project the frame 2, and when a driving pulley or the like for the carriage is accommodated in the projection, Problems can be prevented from occurring, and the conventional drive device can be used as it is. Further, in the image reading apparatus 1 shown in FIG. 2, a control panel 8 is arranged on the front frame so that the apparatus can be operated on the front side.

As shown in the figure, the side plate 4 is disposed at a position retracted from between projections 6 and 6a formed on the front and rear sides, and an edge 5 formed by the platen 3 and the side plate is formed. Is located. Therefore, the binding portion of the book document D such as a thick book can be opened by approximately 90 ° and pressed against the edge 5 to set the document. Then, for example, by positioning one of the upper and lower ends of the book document D while pressing it against the inner surface of the protrusion, the document can be easily positioned. Is obtained in a state where it is aligned with a certain position of

With respect to the scanner 10 shown in FIG.
In the apparatus of the present invention, a scanner having a configuration as shown in FIG. 3 can be used. The scanner is reciprocated along the lower surface of the platen 3 to read an image of a document. In the scanner 20 shown in FIG. 3, one lamp 22, a mirror m, and a contact image sensor (CIS) 24 are provided in combination with a carriage 21. Then, the light of the lamp 22 reflected on the image surface of the document is directly transmitted to the CIS 24 via the mirror m and the lens 23, and the optical signal is converted into an electric signal and output. In the mirror m, in order to obtain the reflection of light up to the edge 5 formed by the platen 3 and the side plate 4, the mirror m is inclined at an angle θ1. It is similar to a mirror.

In addition to the embodiment shown in FIGS. 1 and 2, in the present invention, an apparatus having the structure shown in FIGS. 4 and 5 can be constructed. In this embodiment, an image reading apparatus 1a is provided. Of the edge 5 at the joint with the platen 3 is formed at an obtuse angle.
In the scanner 10 movably arranged below the platen, the mirror m of the full rate carriage 11
The angle of 1 is positioned at about 45 ° as in the case of the conventional general scanner, and transmits the light reflected at right angles to the platen toward the mirror m2 of the half-rate carriage 13. ing. By arranging the side plates so as to be inclined, a margin space can be formed on the lower surface of the inclined portion of the side plate 7, so that the full rate carriage 11 can be moved to the edge 5 side end of the platen 3. . A pulley 17 for driving the carriage 11 is disposed in a space below the side plate, and performs drive transmission using a wire 18.
As shown in FIG. 5, which is shown as a side view of the apparatus of FIG. 4, the appearance of the frame of the apparatus is seen in FIG. 2 because the side plates are arranged at an angle with respect to the horizontal platen 3. Thus, no projection is formed on the rear and front sides of the frame.

When reading the book document D using the image reading device 1a, the book document D is opened through 90 ° or more through the binding line D1, but it is necessary to bend the spine greatly. There is no. When the original D is opened and the binding is set by pressing the binding against the edge 5, the binding does not rise and the reading surface can be uniformly pressed and held against the platen 3. Therefore, the entire surface of the document D can be read without distortion, and clear image information can be reproduced without refracting light passing through the platen glass.

In the above-mentioned embodiment of the present invention, conventionally known devices can be used as the two carriages constituting the scanner and the driving system for the carriages. When the image reading device is provided as a reading device of a facsimile machine, the CC
The image information output from D can be transmitted via a facsimile mechanism. Further, when an image reading device is arranged in a device such as a copying machine, it is possible to transmit image information of a document to a recording paper forming unit and reproduce it as a copy.

[0017]

According to the image reading apparatus of the present invention, as described above, the end face of the platen is positioned to the side of the apparatus, and the edge formed by the end of the platen and the surface on the apparatus side is The binding of the book document can be easily set and read, and the document can be easily positioned. Further, since the reading direction is provided on the carriage for reading the image of the document with the reading direction inclined to the edge side, it is possible to obtain the read information in a good state without moving the carriage to a position immediately below the book binding. Can be. Further, when the side surface of the apparatus is an inclined surface, an edge formed by the platen is formed at an obtuse angle, and when the carriage is configured to be movable directly below the edge, the carriage is moved to an end of the platen. Can be read. In the apparatus of the present invention, the document surface to be read can be set flat by opening the binding portion of the book with respect to the edge formed between the end of the platen and the side surface of the device, It is possible to clearly read the binding portion, and prevent the book from being damaged when the book is opened horizontally.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating a configuration of an image reading apparatus of the present invention.

FIG. 2 is an external view of the apparatus of FIG.

FIG. 3 is an explanatory view of another embodiment of the scanner.

FIG. 4 is an explanatory diagram illustrating another configuration of the image forming apparatus.

FIG. 5 is an external view of the apparatus of FIG.

[Explanation of symbols]

Reference Signs List 1 image reading device, 2 frame, 3 platen, 4.7 side plate, 5 edge part, 6 protrusion, 8 control panel, 10 scanner, 11 full rate carriage, 12 lamp, 13 half rate carriage, 15 lens, 16 CCD, 17 Pulley, 18 wires, 20 scanner, 21 carriage,
22 lamps, 24 CIS.

Claims (3)

[Claims] An image reading apparatus having a scanner that moves along a lower surface of a platen and reads an image of a document set on the platen, wherein an end surface of the platen is positioned to a side surface of the device, and an end of the platen An image reading apparatus for setting a binding of a book document to an edge formed by a unit and a surface on the apparatus side and performing reading. 2. A carriage which moves along a lower surface of the platen and reads an image of a document is provided with a reading direction inclined to the edge side.
The image reading device according to claim 1. 3. The apparatus according to claim 1, wherein the side surface of the apparatus is an inclined surface, an edge formed by the platen is formed at an obtuse angle, and the carriage is configured to be movable to a position directly below the edge. Image reading device.