JP3375033B2 - Original image reading device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a document image reading device. More specifically, the present invention relates to a document image reading device used for a copier, a printer, a facsimile, a scanner, a complex machine including these, and the like, for reading an image of an automatically conveyed document.

[0002]

2. Description of the Related Art In a conventional document image reading apparatus, the presence or absence of a document and the size of the document are detected by a detection sensor (photo sensor) or a CCD image sensor. Specifically, when the light emitted from the lamp forming the reading optical system scans the document, the CCD on the scanning surface side of the document detects the time during which the light is blocked by the document to determine the document size. Therefore, a document size detecting device in an image processing device for detecting the size of a document is conventionally known (Japanese Patent Laid-Open No. Sho 60-
No. 41362). Further, there is also known a document size detecting device for a copying machine in which a sensor head and a detecting means are optically connected by an optical fiber, and the presence or absence of a document and the size of the document are detected by the detecting means (Japanese Patent Laid-Open No. Sho 60). -168138). Also, in the document size detection mode, the scanner is scanned from the position opposite to the reference position to the reference position side to perform size detection operation, so that it does not take time to start copying due to size detection. A size detection device is also known (see Japanese Patent Laid-Open No. 61-286834).

Further, by providing an optical condenser lens facing the original surface on the front end side of the optical fiber light introducing portion, it is possible to detect a minute difference in the original size without being affected by the thermal effect of the exposure lamp. A document size detecting device for increasing the accuracy of size detection is also known (see Japanese Patent Laid-Open No. 61-286835). Further, an original document conveyed on the contact glass is exposed by an exposure lamp, and reflected light is imaged on a CCD image sensor by an optical scanning system to be sequentially read. In parallel with detecting the arrival at the home position, this CCD image sensor measures the length from the leading edge to the trailing edge of the document,
There is also a method for detecting the size of a document in a digital copying machine, in which the CCD image sensor reads the length of the document in the conveyance direction and the width of the document at the same time by reading it by measuring the time when it is conveyed by the DF and passing through the CCD image sensor. Known (Japanese Patent Laid-Open No. 62-
(See the publication of No. 61467). As described above, in the conventional document image reading apparatus, the photo interrupt sensor with the aperture is used to detect the presence or absence of the document placed on the ADF device, and the presence or absence of the document and the size of the document are detected. A sensor for detection is used for
Because of the high cost, the CCD image sensor is also used to detect the presence or absence of a document and the size of the document.
However, when the CCD image sensor is used, there is a problem that the original image reading apparatus becomes expensive due to the complicated structure of the entire apparatus.

[0004]

In the above-mentioned conventional document image reading apparatus, a photo interrupt sensor with an aperture is used to detect the presence or absence of a document placed on the ADF device, and further, on the contact glass. A sensor for detection is used to detect the presence or absence of a document and the size of the document, but the cost is high. In order to solve this problem, the CCD image sensor is also used to detect the presence or absence of a document and the size of the document, but it is said that the document image reading device will become expensive due to the complexity of the entire device. There was a problem. Then, the subject of this invention is solving such a problem. That is, it is an object of the present invention to provide a low-cost original image reading apparatus that also detects the presence or absence of an original placed on the ADF apparatus by a reading device that reads the image of the original and ensures the operation thereof.

[0005]

To achieve the above object, the present invention according to claim 1 provides an original image reading apparatus for reading an image of an original automatically conveyed to a reading position by an automatic original feeding apparatus. , A reading device that reads an image of a moving original at a reading position, a traveling body that moves the reading device between a reading position and a detection position, and the original is automatically conveyed to the reading position of the reading device Automatic document feeder,
When one or a plurality of light emitting elements arranged at a detection position for detecting the presence or absence of the original placed on the automatic document feeder, the reading device is located at the detection position. The main feature is that the reading device receives the light emitted from the light emitting element. According to a second aspect of the present invention, in the document image reading apparatus according to the first aspect, the main feature is that the size of the document placed on the ADF device is also detected at the detection position. To do. The present invention according to claim 3 provides the invention according to claim 1 or 2.
In the document image reading apparatus described above, the main feature is that the reading device is configured to be able to receive the light emitted from the light emitting element at the detection position by the light guiding means. The present invention according to claim 4 relates to claim 3
The document image reading apparatus described above is characterized mainly in that the light guide means is a light guide window.
A fifth aspect of the present invention is characterized in that, in the document image reading apparatus according to the third aspect, the light guide means is a light guide plate. According to a sixth aspect of the present invention, in the document image reading apparatus according to the third, fourth or fifth aspect,
The main feature of the light guide means is that it has a dustproof means for preventing the accumulation of foreign matter. A seventh aspect of the present invention is characterized in that, in the document image reading apparatus according to the third, fourth, fifth or sixth aspect, the light guide means has a light blocking plate for preventing incidence of stray light. To do. According to an eighth aspect of the present invention, in the document image reading apparatus according to the first, second, third, fourth, fifth, sixth or seventh aspect, a plurality of the light emitting elements are alternately turned on. Characterize. The present invention according to claim 9 relates to claim 1, 2, 3,
The document image reading apparatus described in 4, 5, 6, 7 or 8 is characterized mainly in that a plurality of the light emitting elements are alternately and adjacently arranged on the same substrate.

[0006]

According to the first aspect of the present invention, there is provided a document image reading apparatus which comprises a reading device for reading a read image of a document which is being conveyed and moved at a reading position.
The DF device travels together with the traveling body from a position capable of receiving light emitted from one or a plurality of light emitting elements arranged at a detection position for detecting the presence or absence of a document before being fed to the reading position. As a result, it is possible to provide a low-cost document image reading apparatus that also detects the presence / absence of a document placed on the ADF device by a reading device that reads the image of the document and ensures the detection operation. .
According to another aspect of the present invention, the ADF is a reading device that reads a read image of a document that is being conveyed and moved at a read position.
Since the document is moved along with the traveling body from the detection position for detecting the presence or absence of the document placed on the apparatus and the size of the document to the reading position, the document placed on the ADF apparatus is read by the reading device for reading the image of the document. It is possible to provide a low-cost document image reading apparatus that detects the presence / absence of a document and also detects the presence / absence of a document and the size of the document to ensure the operation thereof.

According to another aspect of the present invention, a reading device for reading a read image of a document which is being conveyed and moved at a reading position is provided with one or a plurality of light emitting devices arranged at a detection position for detecting the presence or absence of the document placed on the ADF device. Since the light emitted from the element is made to travel together with the traveling body from the position where the light guide means can receive light to the reading position, the presence or absence of the document placed on the ADF apparatus is detected by the reading device that reads the image of the document. It is also possible to provide a low-cost original image reading apparatus that also serves as a light source, enhances its light-collecting property, and ensures a detection operation. According to a fourth aspect of the present invention, a reading device for reading a read image of a document being conveyed and moved at a reading position is provided from one or a plurality of light emitting elements arranged at a detection position for detecting the presence or absence of the document placed on the ADF device. Since the emitted light is moved together with the traveling body from the position where the light guide means, which is the light guide window, can be received to the reading position, the presence or absence of the document placed on the ADF device by the reading device that reads the image of the document, etc. It is possible to provide a low-cost document image reading apparatus that also serves to detect the above and improves the light condensing property easily and ensures the detection operation.

According to a fifth aspect of the present invention, one or a plurality of light-emitting devices are provided at a detection position for detecting the presence or absence of the document placed on the ADF device by a reading device for reading the read image of the document being conveyed and moved at the reading position. Since the light emitted from the element is moved along with the traveling body from a position where the light guide means, which is a light guide plate, can receive the light, a reading device for reading the image of the document A
It is possible to provide a low-cost document image reading device that also serves to detect the presence or absence of a document placed on the DF device and further improves the light condensing property, has a dustproof effect, and ensures the detection operation. In a sixth aspect of the present invention, a reading device for reading a read image of a document which is being conveyed and moved at a reading position is provided from one or a plurality of light emitting elements arranged at a detection position for detecting the presence or absence of the document placed on the ADF device. Since the emitted light is moved together with the traveling body from the position where the light guide means having the dustproof means can be received to the reading position, the presence or absence of the document placed on the ADF device by the reading device for reading the image of the document is checked. It is possible to provide a low-cost document image reading apparatus which is also dust-proof for detection and whose light-collecting property is improved and the detection operation is surely performed without lowering the output.

According to another aspect of the present invention, one or a plurality of light emitting devices are provided at a detection position for detecting the presence / absence of a document placed on the ADF device by a reading device for reading a read image of a document being conveyed and moved at a reading position. Since the light emitted from the element is made to travel together with the traveling body from the position where the light guide means having the light shielding plate can receive light, the reading device for reading the image of the document reads the image of the document placed on the ADF device. It is possible to provide a low-cost document image reading apparatus that also serves to detect presence / absence and the like, improves its light-collecting property, prevents stray light from entering, and ensures a detection operation. In claim 8, a reading device for reading a read image of a document being conveyed and moved at a reading position is alternately turned on at one or a plurality of positions arranged at a detection position for detecting the presence or absence of the document placed on the ADF device. Since it is configured to move together with the traveling body from the position where the light emitted from the light emitting element can be received to the reading position, the reading device for reading the image of the document also serves to detect the presence or absence of the document placed on the ADF device. It is possible to provide a power-saving and low-cost document image reading apparatus that reduces the load and ensures the detection operation of the document.

According to a ninth aspect of the present invention, a reading device for reading an image of a document which is being conveyed and moved at a reading position is AD.
It is configured to be movable between a detection position for detecting the presence or absence of a document placed on the F device, and at the detection position,
Light emitted from a plurality of light emitting elements arranged adjacent to each other alternately on the same substrate is received through the light guide on the light emitting side. It is possible to provide a small-sized and low-cost document image reading apparatus that also serves to detect the presence or absence of a document placed on the document and ensures the detection operation.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a main part of a document image reading apparatus according to an embodiment of the present invention, and FIG. 2 is a plan view of a conveyance path. While the original 1 is pressed against the upper surface of the contact glass 2b by the pressure plate 2a arranged at the reading position 2 indicated by a triangle (Δ), the reading image is read by the reading device 3 which is a contact sensor. The discharge roller 2c discharges the image from the reading position 2 in the direction of arrow A shown in the drawing. The ADF device (automatic document feeder) 4 feeds the document 1 placed on the document table 4a, which also serves as a holding plate for the book document 1a, into the transport path 4d by a sheet feeding roller (not shown) or the like. By the cooperation of the separation pad 4b that presses the elastic force and the feed roller 4c that rotates in the direction of the arrow B, they are separated one by one and sent to the conveyance path 4d, and the conveyance roller pair 4e sends them to the reading position 2. The feeding timing of the document 1 is controlled by a control unit (not shown) based on a document detection signal from the sensor 4f, and is automatically conveyed to the reading position 2. The feed roller 4c is rotationally driven by the motor drive circuit 13 and the motor 4g shown in FIG.

Detecting position 5 of a triangle mark (Δ) shown in the figure for detecting the presence or absence of the document 1 placed on the document table 4a of the ADF device 4.
One or a plurality of light emitting elements 6 which are light emitting diodes (hereinafter referred to as LEDs) are arranged above the transport path 4d corresponding to the above. The reading device 3 is integrally held by the traveling body 7, and is read together with the traveling body 7 by the motor drive circuit 13 and the motor 7a.
And the detection position 5 can be moved back and forth. Running body 7
When the vehicle travels from the reading position 2 in the direction of the arrow C in the drawing and moves to the detection position 5, the first light emitting element 6b, the second light emitting element 6c, and the third light emitting element 6 as the light emitting element 6 shown in FIG. The light emitted from the element 6d is received via the light guide means 8 (optical fiber or the like). When the reading device 3 is stopped at the detection position 5 capable of receiving the light emitted from each light emitting element, the presence or absence of the document 1 set on the document table 4a of the ADF device 4 and the size detection are performed. .

As shown in step 1 of the flowchart of FIG. 3, the contact sensor of the reading device 3 held by the traveling body 7 stands by at the detection position 5 before the start of reading. Therefore, at this time, the reading device 3 is located at the detection position 5 directly under the LED of the light emitting element 6 and can receive the emitted light of the light emitting element 6 through the light guide window 8a of the light guide means 8 as shown in FIG. It should be noted that it is located at the position of the scan line 3a shown by the dot-dash line in FIG. That is, FIG. 4 shows the positional relationship between the light emitting element 6 and the reading device, and detection can be performed when the reading device 3 is positioned on the scan line 3a immediately below the fixed light guide means 8. Here, the light guide window 8a is a mere empty space for guiding light, and means one in which the wall surfaces on all four sides are covered with a light shielding material. A medium having excellent photoconductivity such as an optical fiber may be used, which will be described later.

FIGS. 5A, 5B and 5C are views showing the characteristics of the output and time of each light emitting element, and the LED of the first light emitting element 6b located at the center of the conveying path is the original 1 The role of detecting the presence or absence of
When there is no document 1 on the document table 4a (detection position 5) of the DF device 4 (see FIGS. 1 and 2), the first light emitting element 6 is used.
The light emitted from the LED b is incident on the reading device 3 through the light guide means 8 and is output as shown in FIG. 5B. When there is a document, it becomes as shown in FIG.

FIG. 6 is a block diagram showing the configuration of the control system of the present invention. In the system control unit 11, the fact that the original 1 is not at the detection position 5 means that the reading device drive circuit 3b.
The output of the reading device 3 which is a contact sensor driven by is input to the image processing circuit 12 and is confirmed by monitoring the output change due to the emitted light of the LED of the first light emitting element 6b. Now, returning to the flowchart of FIG. 3, the document detection, reading operation, and the like will be described with reference to the flow chart. When the document 1 is set on the document table 4a (see FIGS. 1 and 2), the first light emitting element Since the light emitted from the LED of 6b is blocked, the output of the reading device 3 is obtained and the presence of the document 1 is detected (step 2). After the presence of the document 1 at the detection position 5 is detected, it is confirmed whether or not to start reading the image of the document 1 for transmission or copying (step 3), and the second light emitting element 6c and the third light emitting element 6d are checked. Is turned on and the size of the original 1 is detected (step 4). The light-emitting element lighting circuit 6e is designed to light the first light-emitting element 6b, the second light-emitting element 6c, and the third light-emitting element 6d one at a time without lighting at the same time. Therefore,
Since the power consumption is low and the lights are alternately turned on, the system control unit 11 determines the reading device 3 from the image information at that time.
It becomes easier to judge whether light is incident on the contact sensor and the load on the software is reduced.

7 (a), (b) and (c) are diagrams showing the outputs of the respective light emitting elements, and the method of detecting the size of the original document 1 is as follows. This is done by getting the output. For example, when the document size shown in FIG. 7B is B4, that is, B4 is placed on the document table 4a.
When the original 1 of the size is set (Figs. 1 and 2)
The light emitted from only the third light emitting element 6d is incident on the reading device 3 (not shown), the output is detected, and the system control unit 11 confirms it by the binarized image information in the image processing. To be done. When the size of original 1 is detected,
First light emitting element 6b, second light emitting element 6c, and third light emitting element 6
d is turned off, and the contact sensor of the reading device 3 held by the traveling body 7 moves to the reading position 2 indicated by a triangle mark (Δ) not shown (FIG. 3, step 5). Manuscript 1
Is fed by the ADF device 4 (not shown) (step 6), and when the sensor 4f provided on the feeding path 4d detects the leading edge of the document 1 (step 7), the controller 11
Is the reading position 2 where the leading edge of the original 1 is the triangle mark (△) in FIG.
After the document is conveyed so as to reach the position of the scan line (step 8), the reading of the image of the document of document 1 (not shown) is started (step 9), and the sensor 4f turns off.
When it becomes F, that is, when the trailing edge of the document passes the sensor 4f (step 10), the document 1 currently read is read by a predetermined amount (step 11). Sensor 4f is turned on again
Then, the images of the originals 1 are read one after another (step 12, YES).

In this way, when the images of the originals 1 are read one after another and the next original 1 is not conveyed even after the elapse of a predetermined time (step 13), the reading device 3 held on the traveling body 7 is brought into close contact with the original. The sensor is moved to a detection position 5 (not shown) indicated by a triangle mark (Δ), and after the movement is completed, the first light emitting element 6b is turned on (step 14), and it is determined whether or not the document 1 is present in the ADF device 4 (not shown). (Step 15). When the document 1 is present in the ADF device 4 (not shown), it is judged as a document jam, and the document jam is notified to the operator or the like by a warning display or a warning sound (step 16). Therefore, the presence / absence of the document placed on the ADF device 4 is detected by the reading device 3 for reading the image of the document 1, and the presence / absence of the document 1 and the document 1 are detected.
It is possible to realize a reliable operation by also detecting the size of the document with a low-cost document image reading apparatus.

Next, an example of the form of the light guide means 8 for receiving the emitted light from the light emitting element 6 at the detection position 5 and its peripheral structure will be described. First, FIGS. 8 and 9 show an example of a first form of the light guide means 8 and its peripheral structure. In this form example, the reading device 3 is located directly under the LED of the light emitting element 6, and the light emitting element is The emitted light of 6 can be received through the light guide plate 8b which is an optical fiber of the light guide means 8. However, when the document 1 is placed on the ADF device 4, it is shielded from light (see FIG. 9). Therefore, since the light guide means 8 is the light guide plate 8b which is an optical fiber,
It is prevented that dust or the like enters and is placed on the contact sensor of the reading device 3, the light-collecting property of the emitted light from the light-emitting element 6 is improved, and the detection operation is performed more reliably.

FIG. 10 shows another embodiment, in which a space or a transparent material layer 8A is formed at the upper end of the light guide plate 8b as the light guide means 8.
And a cover 9a (transparent body) for preventing dust and the like from accumulating on the dustproof means 9. Therefore, since there is no accumulation of dust or the like on the upper end portion of the light guide plate 8b of the light guide means 8, the output of the contact sensor of the reading device 3 is maintained without lowering, and erroneous recognition by the system control unit 11 not shown is also prevented. Therefore, the detection operation is performed more reliably.

FIG. 11 shows another embodiment, in which the upper tip of the light guide plate 8b of the light guide means 8 is provided on the lower transport surface 4d 'of the transport path 4d.
A surface-shaped portion 9b is provided so as to be flush with the dust-proofing means 9 to prevent the accumulation of dust and the like. Therefore, since there is no accumulation of dust or the like on the upper end portion of the light guide plate 8b of the light guide means 8, the output of the contact sensor of the reading device 3 is maintained without lowering and erroneous recognition by the system control unit 11 not shown is prevented. Therefore, the detection operation is performed more reliably.

FIG. 12 shows another embodiment, in which the upper end of the light guide plate 8b of the light guide means 8 is provided with an inclined portion 9c having an inclined surface with a rounded top for preventing dust and the like from being accumulated in the dustproof means 9. It is provided. Therefore, since there is no accumulation of dust or the like on the upper end portion of the light guide plate 8b of the light guide means 8, the output of the contact sensor of the reading device 3 is maintained without lowering and erroneous recognition by the system control unit 11 not shown is prevented. Therefore, the detection operation is performed more reliably. Further, the amount of protrusion is set so as not to affect the conveyance of the document and to prevent dust from accumulating.

FIG. 13 shows another embodiment, which is a modification of the embodiment shown in FIG. In this embodiment, the cover 9a is provided at the upper end of the light guide plate 8b of the light guide means 8 to prevent the dust prevention means 9 from accumulating dust and the like, and stray light such as extraneous light is provided near the upstream side of the cover 9a. A light shielding plate 10 for preventing the incidence of 10a is provided. Therefore, the light guide plate 8 of the light guide means 8
Since dust and the like are not accumulated on the upper end portion of b and the stray light 10a is not incident, the output of the contact sensor of the reading device 3 is maintained without lowering, and erroneous recognition by the system control unit 11 not shown is prevented. The detection operation is also performed more reliably.

FIG. 14 shows another embodiment, which is a modification of FIG. In this embodiment, stray light 10a such as extraneous light is provided in the vicinity of the transport path 4d 'and the surface-shaped portion 9b at the surface position, which prevents dust and the like of the dustproof means 9 from being accumulated on the upper end portion of the light guide plate 8b of the light guide means 8. The light-shielding plate 10 for preventing the incidence of light is provided. Therefore, since there is no accumulation of dust or the like and incidence of the stray light 10a on the upper end portion of the light guide plate 8b of the light guide means 8, the output of the contact sensor of the reading device 3 is maintained without lowering, and the system control (not shown) is performed. Since the erroneous recognition by the unit 11 is also prevented, the detection operation is performed more reliably.

FIG. 15 shows another embodiment, which is a modification of FIG. 12, in which the upper end of the light guide plate 8b of the light guide means 8 is rounded so as to prevent accumulation of dust and the like in the dustproof means 9. The light blocking plate 10 is provided which has an inclined portion 9c having an inclined surface and prevents the stray light 10a from entering near the inclined portion 9c.
Is provided. Therefore, since there is no accumulation of dust or the like and incidence of the stray light 10a on the upper end portion of the light guide plate 8b of the light guide means 8, the output of the contact sensor of the reading device 3 is maintained without lowering, and the system control (not shown) is performed. Part 11
Since false recognition due to is also prevented, the detection operation is performed more reliably. FIG. 16 shows another example of the first light emitting element 6.
b, a plurality of second light emitting elements 6c, and third light emitting elements 6d,
Adjacent to each other on the same substrate 6a, these emitted lights are emitted toward the reading device 3 by the light guide plate 20a of the light guide means 20 on the light emitting side through the document conveyance path.

Therefore, the substrate 6a can be made elongated and small, and a low-cost original image reading device can be provided. Further, it is not necessary to limit the arrangement position of the light emitting element to the position shown in FIG. 1, and the degree of freedom in design increases.

[0026]

As described above, according to the first aspect of the invention, the reading device for reading the read image of the document being conveyed and moved at the reading position is the detection position for detecting the presence or absence of the document placed on the ADF device. The reading device that reads the image of the original document is used to move the light emitted from one or a plurality of light emitting elements arranged in
It has become possible to provide a low-cost document image reading device that also serves to detect the presence or absence of a document placed on the DF device and ensures the detection operation. According to the second aspect of the present invention, the reading device is configured to move together with the traveling body from the detection position for detecting the presence or absence of the document placed on the ADF device and the size of the document to the reading position. Thus, it is possible to provide a low-cost document image reading apparatus that detects the presence or absence of a document placed on the ADF device and also detects the presence or absence of a document and the size of the document to ensure the operation thereof. Became.

According to the third aspect of the present invention, the reading device is moved from the position where the light emitting device can receive the emitted light from the one or more light emitting elements arranged at the detection position to the reading position. Since it is configured to travel along with it, the reading device for reading the image of the original document also serves to detect the presence or absence of the original document placed on the ADF device to enhance the light condensing property and ensure the detection operation at low cost. A manuscript image reading device can now be provided. According to the invention of claim 4, from the position where the reading device can receive the emitted light from one or a plurality of light emitting elements arranged at the detection position by the light guide means which is a light guide window, Since it is configured to travel with the traveling body, the reading device that reads the image of the original document also serves to detect the presence or absence of the original document placed on the ADF device and the light condensing property is easily improved to ensure the detection operation. It has become possible to provide a low-cost document image reading apparatus.

According to the fifth aspect of the present invention, the reading device is arranged at a position where the light emitted from the one or a plurality of light emitting elements arranged at the detection position can be received by the light guide means which is a light guide plate. Since the carriage is moved to the reading position together with the traveling body, the reading device for reading the image of the original document also serves to detect the presence / absence of the original document placed on the ADF device and the light condensing property is further improved, resulting in a dustproof effect. It is possible to provide a low-cost document image reading device that ensures the presence detection operation. According to the invention of claim 6, the reading device is moved to a reading position from a position where light emitted from one or a plurality of light emitting elements arranged at a detection position can be received by a light guiding means having a dustproof means. I decided to move with my body,
A low-cost document that doubles as the presence or absence of a document placed on the ADF device by a reading device and is dust-proof to improve its light-collecting property and ensure a detection operation without lowering the output. It has become possible to provide an image reading device.

According to the invention of claim 7, from the position where the reading device can receive the emitted light from one or a plurality of light emitting elements arranged at the detection position by the light guiding means having a light shielding plate. Since the carriage is moved to the reading position together with the traveling body, the reading device for reading the image of the original document also serves to detect the presence or absence of the original document placed on the ADF device to enhance its light-collecting property and prevent the incidence of stray light. It has become possible to provide a low-cost document image reading apparatus that is prevented and ensures the detection operation.

According to the invention of claim 8, the reading device is moved from a position capable of receiving emitted light from one or a plurality of light emitting elements alternately arranged at the detection position to the reading position. Since it travels with the body, the reading device that reads the image of the document also serves to detect the presence / absence of the document placed on the ADF device and reduces the load of the detection operation to ensure the power saving. It has become possible to provide a low-cost document image reading device.

According to the ninth aspect of the invention, the emitted light from a plurality of light emitting elements arranged alternately adjacent to the detection position on the same substrate is read through the light guide means on the light emitting side. Since the device is made to receive the light and the reading device is made to move together with the traveling body from the position where the light from the light emitting element can be received to the reading position, the document placed on the ADF device by the reading device for reading the image of the document is read. It has become possible to provide a small-sized and low-cost document image reading apparatus that also detects the presence or absence of a document and ensures the detection operation.

[Brief description of drawings]

FIG. 1 is a cross-sectional view illustrating an outline of a document image reading apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view of a main part of FIG.

FIG. 3 is a flowchart illustrating an operation of a document image reading apparatus according to an example of the present invention.

FIG. 4 is a perspective view illustrating another main part of the document image reading apparatus according to the embodiment of the present invention.

5 (a), (b) and (c) are graphs showing the characteristics of output and time for explaining the states of other main parts of the original image reading apparatus of the embodiment of the present invention.

FIG. 6 is a block diagram illustrating another main part of the document image reading apparatus according to the embodiment of the present invention.

7 (a), (b) and (c) are graphs showing output and time characteristics for explaining the states of other main parts of the original image reading apparatus according to the embodiment of the present invention.

FIG. 8 is an explanatory diagram illustrating a main part of a document image reading apparatus according to another embodiment of the present invention.

FIG. 9 is an explanatory view of another embodiment of the light guide means of the present invention.

FIG. 10 is an explanatory view of another embodiment of the light guide means of the present invention.

FIG. 11 is an explanatory view of another embodiment of the light guide means of the present invention.

FIG. 12 is an explanatory view of another embodiment of the light guide means of the present invention.

FIG. 13 is an explanatory diagram of another embodiment of the light guide means of the present invention.

FIG. 14 is an explanatory view of another embodiment of the light guide means of the present invention.

FIG. 15 is an explanatory view of another embodiment of the light guide means of the present invention.

FIG. 16 is an explanatory view of another embodiment of the light guide means of the present invention.

[Explanation of symbols]

1 ... Original, 1a ... Book original, 2 ... Reading position, 2a ... Pressure plate, 2b ... Contact glass, 2c ... Discharge roller, 3 ... Reading device, 3a ... Scan line, 3b ... reading device drive circuit, 4 ... ADF device, 4a ... document table, 4b ... separation pad, 4c ... feed roller,
4d ... transport path, 4e ... transport roller pair, 4f ...
・ Sensor, 4g ・ ・ ・ Motor, 5 ・ ・ ・ Detection position, 6 ・
..Light emitting element, 6a ... Substrate, 6b ... First light emitting element, 6c ... Second light emitting element, 6d ... Third light emitting element, 6e ... Light emitting element lighting circuit, ...・ Running body, 7
a ... motor, 8 ... light guide means, 8a ... light guide window, 8b ... light guide plate, 9 ... dustproof means, 9a ...
Cover, 9b ... Surface shape part, 9c ... Inclined part, 1
0 ... Shading plate, 10a ... Stray light, 11 ... System control part, 12 ... Image processing circuit, 13 ... Motor drive circuit.

Claims (9)

(57) [Claims] 1. A document image reading apparatus for reading an image of a document automatically conveyed to a reading position by an automatic document feeder, and a reading device for reading an image of a document being conveyed and moved at the reading position, and the reading device. A traveling body that is moved between a reading position and a detection position, an automatic document feeder that automatically conveys the document to the reading position of the reading device, and the automatic document feeder mounted on the automatic document feeder. A reading device receives the light emitted from the light emitting element when the reading device is located at the detection position. A document image reading apparatus characterized by: 2. The original image reading apparatus according to claim 1, wherein the size of the original placed on the automatic original feeding apparatus is based on data received by the reading device from the light emitting element at the detection position. A document image reading apparatus, which is provided with a control unit that also determines whether the image is read. 3. The document image reading apparatus according to claim 1, wherein the reading device receives the light emitted from the light emitting element at the detection position via a light guiding unit. Image reading device. 4. The original image reading device according to claim 3, wherein the light guide means is a light guide window. 5. The document image reading apparatus according to claim 3, wherein the light guide means is a light guide plate. 6. The original image reading apparatus according to claim 3, 4 or 5, wherein the light guide means has a dustproof means for preventing accumulation of foreign matter. 7. The original image reading device according to claim 3, 4, 5 or 6, wherein the light guide means has a light shielding plate for preventing incidence of stray light. 8. The original image reading apparatus according to claim 1, wherein the plurality of light emitting elements are alternately turned on. Reader. 9. The document image reading device according to claim 1, 2, 3, 4, 5, 6, 7 or 8, wherein a plurality of the light emitting elements are adjacently arranged on the same substrate. A document image reading device having a configuration.