JP4858589B2 - Image reading device - Google Patents

Description

The present invention relates to an image reading apparatus that conveys a document and reads an image.

  An image reading apparatus having an automatic document feeding function is configured to be able to open and close a predetermined section on a document transport path by an ADF cover or a document cover in preparation for a paper jam or the like, and these covers are closed. Automatic document feeding is executed only when the passing document can be pressed from above. In order to specify the open / closed state of the ADF cover or the like, generally, a sensor that detects only whether the ADF cover or the like is in a completely closed state is used, and the ADF cover or the like slightly floats from the closed position. Even in a state (hereinafter also referred to as a half-open state), the ADF cover or the like has been specified as a fully opened state. For this reason, when the ADF cover or the like is in a half-opened state, automatic document feeding is prohibited although automatic document feeding is possible, and the usability is poor.

JP 2005-94304 A

  Here, in Patent Document 1, the open / closed state of the ADF opening / closing lid includes a closed state in which the ADF is completely closed, an open state in which the door is completely opened, a position where the opening / closing lid is open, and a closed state. An image forming apparatus that detects any one of a lift-up state that is a state located in the middle of the state position is described. However, it is not disclosed how to specifically detect these states.

  The present invention has been made in order to solve the above-mentioned problems, and, as in the past, an image that can improve usability while using a sensor that detects only whether the ADF cover or the like is in a completely closed state. An object is to provide a reader.

  The image reading apparatus according to claim 1, which has been made to solve the above problem, is movable between a closed position that covers an open / close section that is a part of a document transport path and an open position that opens the open / close section. , A closed position detecting means for detecting whether or not the cover is in the closed position, a first reading means for reading an image on one side of the document in the open / close section, and the document as a transport path The first reading unit reads the image on one side of the document, reads the image by the first reading unit, and reads the image. And external light detection means for detecting the intensity of external light inserted into the open / close section from the outside of the device based on the image data generated by. When the closed position detecting means determines that the cover is not located at the closed position, the reading control means executes the document reading process according to the intensity of the external light detected by the external light detecting means. To decide.

  In this way, even if it is detected that the document cover is not completely closed, it is determined whether the document cover is half open based on the intensity of external light inserted into the open / close section opened and closed by the document cover. It becomes possible to judge. When the external light inserted into the open / close section is sufficiently weaker than when the document cover is opened, it is possible to perform scanning by automatic document feeding assuming that the document cover is in a half-open state. Further, when it can be considered that the document cover is sufficiently opened due to the intensity of external light, it is possible to prohibit the execution of scanning by automatic document feeding as in the past. Accordingly, it is possible to execute scanning when the document cover is in a half-open state while using a sensor that only detects whether or not the document cover is completely closed as in the prior art. Usability can be improved.

More specifically, the image reading apparatus may be configured as follows.
That is, as described in claim 2, the reading control means receives an instruction from the outside to start the document reading process, and the closed position detecting means determines that the cover is not positioned at the closed position. In this case, when the intensity of the external light detected by the external light detection means is within an allowable range, the processing may be started.

By doing so, scanning can be started when the document cover is in a half-open state.
According to a third aspect of the present invention, the reading control means uses the external light detection means when the closed position detection means determines that the cover is not positioned at the closed position during the document reading process. If the detected intensity of outside light is outside the allowable range, the processing may be stopped.

By doing so, the scan can be continued even if the document cover is half-opened during the scan.
By the way, when it is detected that the document cover is not completely closed during the conveyance of the document, there is a possibility that the reading surface of the first reading unit is covered with the document being conveyed.

  Therefore, the image reading apparatus according to claim 4 detects the position of the document conveyed by the reading control means, and determines whether the reading surface of the first reading means is covered with the document based on the position. And a reading control unit that detects the external light when the reading surface of the first reading unit is covered with the original when the determination result by the reading surface determination unit is affirmative. In consideration of the decrease in the intensity of the external light detected by the means, the execution state of the document reading process is determined according to the intensity of the external light.

This makes it possible to determine with high accuracy whether or not the document cover is in the half-open state.
By the way, a mechanism for performing automatic document feeding is mounted on the document cover that opens and closes the document table of the image reading apparatus. However, a new reading means is provided on the document transport path in this automatic document feeding. It has been proposed to read an image in parallel on the front side and the back side of a document. In the image reading apparatus having such a configuration, a part of the conveyance path is opened and closed by the ADF cover provided on the document cover, so that it is inserted into the reading surface of the reading unit provided on the conveyance path. It is assumed that the intensity of light changes.

  Therefore, in the image reading apparatus according to claim 5, the first reading unit is installed corresponding to the upstream reading position on the open / close section in the transport path, and one of the originals passing through the upstream reading position. The image of the other side of the document passing through the position is read and installed in correspondence with the downstream reading position on the downstream side of the opening / closing section with reference to the document conveyance direction in the conveyance path. Second reading means for performing is further provided. Then, in the document reading process, the reading control unit performs image reading on one side of the document by the first reading unit while passing the document through the upstream reading position, and passes the document through the downstream reading position. Then, the image on the other side of the original is read by the second reading means, and image data on both sides of the original is generated in parallel.

  In addition, a document conveyance path provided inside the document cover is generally provided with a U-shaped section curved in a U-shape, and when the leading edge of the document passes through the U-shaped section, for example, Even if the ADF cover is opened, it is considered that the document can be continuously conveyed.

  Accordingly, in the image reading apparatus according to the sixth aspect, the U-shaped section that is a section curved in a U-shape is provided as a part of the section in the transport path, and the U-shape is based on the transport direction of the document. An opening / closing section is provided on the upstream side of the section, and a downstream reading position is provided on the downstream side of the U-shaped section, and the document is downstream of the starting point of the U-shaped section with respect to the conveyance direction. 1st passage judgment means which judges whether it passed through a predetermined position in. Then, the reading control unit sequentially executes the document reading process for a plurality of documents placed on the document feeding unit provided at the starting point of the conveyance path, and closes during the document reading process. If it is determined by the position detection means that the cover is not positioned at the closed position, and the determination result by the first passage determination means is affirmative, the document relating to the determination by the first passage determination means is outside light. Regardless of the intensity of external light detected by the detection means, the process is continuously executed.

  In this way, regardless of the open / closed state of the ADF cover or the like, the document that has passed through the U-shaped section can be continuously scanned and scanned, and the usability of the image reading apparatus can be improved.

  Further, in the image reading apparatus that reads an image on the front surface and the back surface of the document in parallel, a reading section provided on the transport path reads by opening and closing a part of the transport path by the document cover. It is assumed that the intensity of external light entering the surface changes.

  Therefore, in the image reading apparatus according to claim 7, the first reading unit is installed corresponding to the downstream reading position on the opening / closing section in the conveyance path, and one of the documents passing through the downstream reading position is provided. The image of the other side of the document passing through this position is read by being read corresponding to the upstream reading position on the upstream side of the opening / closing section with reference to the document conveyance direction in the conveyance path. Second reading means for performing is further provided. Then, in the document reading process, the reading control unit reads the image of one side of the document by the first reading unit while passing the document through the downstream reading position, and passes the document through the upstream reading position. Then, the image on the other side of the original is read by the second reading means, and image data on both sides of the original is generated in parallel.

  Also, generally, a U-shaped section is provided in the document transport path provided inside the document cover, and further, provided on the document placing table covered by the document cover on the downstream side of the U-shaped section. A reading position corresponding to the reading means provided is provided. Then, after the original passes through the reading position, it is considered that the original can be continued even if the original cover is opened.

  Therefore, in the image reading apparatus according to the eighth aspect, the U-shaped section that is a section curved in a U-shape is provided as a partial section in the transport path, and the U-shape is based on the transport direction of the document. An open / close section is provided on the downstream side of the section, and an upstream reading position is provided on the upstream side of the U-shaped section. In addition, the document reading apparatus includes a first document pressing unit that presses a document passing through a downstream reading position against a reading surface of the first reading unit, and a downstream reading position on the basis of the conveyance direction of the document. And a second passage determining means for determining whether or not a predetermined position downstream of the second passage is passed. Then, the reading control unit sequentially executes the document reading process for a plurality of documents placed on the document feeding unit provided at the starting point of the conveyance path, and closes during the document reading process. If it is determined by the position detection means that the cover is not located at the closed position, and the determination result by the second passage determination means is affirmative, the document relating to the determination by the second passage determination means is outside light. Regardless of the intensity of external light detected by the detection means, the process is continuously executed.

  In this way, regardless of the open / closed state of the document cover or the like, the document that has passed the downstream reading position can be continuously scanned and scanned, and the usability of the image reading apparatus can be improved. .

2 is a top view and a cross-sectional view of the image reading apparatus. FIG. It is sectional drawing and a side view of an image reading apparatus. 1 is a side view of an image reading apparatus and a block diagram illustrating a configuration of the image reading apparatus. It is explanatory drawing which shows the cross section of an image reading apparatus typically. It is a flowchart of an image reading process. It is a flowchart of a conveyance propriety determination process. 10 is a flowchart of next original presence / absence determination processing and the like. 6 is a flowchart of document presser passage determination processing and the like.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments of the present invention are not limited to the following embodiments, and various forms can be adopted as long as they belong to the technical scope of the present invention.

[Description of configuration]
FIG. 1A shows a top view of the image reading apparatus 1 of the present embodiment. The image reading apparatus 1 includes a document placing table that functions as a flat bed scanner, and a document cover that includes an ADF (Auto Document Feeder) that is attached to the document placing table by a hinge. Further, an ADF cover that covers a transport roller for transporting a document, a transport route of the document, and the like is attached to the document cover by a hinge so as to be opened and closed.

  1B, 1C, and 2A are cross-sectional views of the image reading apparatus 1. FIG. FIG. 1B is a cross-sectional view taken along the line AA ′ when the ADF cover 4 is in the closed position, and FIG. 1C is a cross-sectional view when the ADF cover 4 is in the open position. BB 'sectional drawing is described. FIG. 2A shows a cross-sectional view taken along the line BB ′ of the image reading apparatus 1 when the ADF cover 4 is in a half-open state. As shown in FIG. 1C, an ADF cover sensor 20 for detecting that the ADF cover 4 is closed is provided inside the document cover 3 (details will be described later). To do).

  FIGS. 2B, 2C and 3A show a closed state where the document cover 3 is located at the closed position, an open state where the document cover 3 is located at the open position, and a half-open state. Are side views of the image reading apparatus 1. The document cover 3 is a cross-sectional view taken along the line AA ′ in the top view of FIG.

  Subsequently, FIG. 3B is a block diagram showing the configuration of the image reading apparatus 1 of the present embodiment. The image reading apparatus 1 includes a document cover sensor 10 that detects the closed state of the document cover 3, an ADF cover sensor 20 that detects the closed state of the ADF cover 4, and the document cover 3. A transport unit 30 that transports a document placed on the document along the transport path and functions as an ADF, and an image reading unit that can perform image reading in parallel on the front and back surfaces of the document transported on the transport path 40, a document sensor 50 that detects a document on the conveyance path, a RAM 60 and a ROM 70 that store various types of information, and a CPU 80 that performs various processes based on programs stored in the ROM 70 and controls the image reading apparatus 1 in an integrated manner. have. Each component is connected to each other by an internal bus 90.

FIG. 4 is an explanatory diagram schematically showing a cross section of the image reading apparatus 1. Here, the configuration of the document cover 3 will be described in more detail using the explanatory diagram shown in FIG.
The transport unit 30 includes transport rollers 32 a to 32 i that transport a document placed on the document feeder 31 to the document discharge unit 33 along a transport path (dotted line in FIG. 4). In addition, an upstream side reading position and a downstream side reading position are provided in the transport path, and a back side CIS 41 for reading an image on the back side of the document is provided at a position corresponding to the upstream side reading position. In addition, a back side document pressing portion 42 for pressing a document passing through the upstream side reading position against the reading surface of the back side CIS 41 is provided. Further, the surface CIS 43 provided on the document table 2 is configured to be movable to a position corresponding to the downstream reading position, and the surface that presses the document passing through the downstream reading position against the reading surface of the surface CIS 43. A document holding portion 44 is provided.

  The back side document pressing portion 42 constitutes a part of the ADF cover 4, and when the ADF cover 4 is opened, the opening / closing section including the section in contact with the back side document pressing portion 42 in the transport path is opened to the outside. The Further, the contact surface with the document in the surface document pressing portion 44 constitutes a part of the contact surface between the document cover 3 and the document placing table 2, and when the document cover 3 is opened, the surface contact surface in the transport path. The opening / closing section in contact with the document pressing portion 44 is opened to the outside.

  Further, the section where the transport rollers 32e to 32g are arranged on the transport path forms a U-shaped section curved in a U-shape, and the upstream side reading position is U-shaped based on the transport direction of the document. On the upstream side of the section, the downstream side reading position is disposed on the downstream side of the U-shaped section.

  Further, an F sensor 51, an RB sensor 52, and an R sensor 53 are provided on the transport path as document sensors 50 for detecting the presence or absence of a document being conveyed at a corresponding position. A document cover sensor 10 that detects the closed state of the document cover 3 is provided inside the document cover 3.

[Description of operation]
[First embodiment]
Next, the operation of the image reading apparatus 1 in the first embodiment will be described.

(1) Image Reading Process First, the documents placed on the document feeder 31 are sequentially conveyed and automatically fed, and scanning is performed on the front surface, the back surface, or both the front and back surfaces of these documents. The image reading process will be described with reference to the flowchart of FIG. This process is a process executed when a scan start instruction is received from the user via an operation unit (not shown).

  In S105, the CPU 80 of the image reading apparatus 1 determines whether or not the ADF cover 4 is closed by the ADF cover sensor 20, and in the case of an affirmative determination (S105: Yes), in S125, in the case of a negative determination (S105: No) ) Shifts the processing to S110.

  In S110, the CPU 80 reads an image with the back side CIS 41 and generates image data. In subsequent S115, the CPU 80 determines the white level in the image data, and determines the intensity of external light to be inserted into the reading surface of the back surface CIS 41. When the white level is equal to or higher than a preset threshold value (S115: Yes), the ADF cover 4 is considered to be in an open state, and the process proceeds to S120. When the white level is less than the threshold value ( S115: No), it is assumed that the open / close state of the ADF cover 4 is a half-open state in which the document can be substantially conveyed in the open / close section covered by the ADF cover 4, and the process proceeds to S125.

  In S <b> 120, the CPU 80 notifies the user of the scan stop by a display unit (not shown) or the like, and ends this process. In S <b> 125, the CPU 80 starts scanning by automatic document feeding for the document placed on the document feeder 31.

  After starting scanning by automatic document feeding, the CPU 80 determines whether the ADF cover 4 is closed by the ADF cover sensor 20 at regular timing, for example (S130). If the ADF cover 4 is in the closed state (S130: Yes), the process proceeds to S150, and if not (S130: No), the process proceeds to S135.

  In S135, the CPU 80 determines whether scanning of only the surface of the document is being executed. If the determination is affirmative (S135: Yes), the process proceeds to S140. If the determination is negative (S135: No), the process proceeds to S155. To migrate.

  In S140, the CPU 80 executes a transportability determination process for determining whether or not automatic document feeding can be continued. If it is determined in the subsequent S145 that it can be continued in the transportability determination process (S145: Yes), the CPU 80 proceeds to S150, and if it is determined in the process that it cannot be continued ( S145: No), the process proceeds to S155.

In S <b> 150, the CPU 80 continuously performs scanning by automatic document feeding, and when the scanning of all the documents placed on the document feeding unit 31 is completed, this processing ends.
In S <b> 155, the CPU 80 notifies the user of the scan stop by a display unit (not shown) or the like, and ends this process.

(2) Conveyance Acceptability Determination Process Next, the conveyance permission / inhibition determination process for determining whether or not the document can be continuously conveyed based on the open / closed state of the ADF cover 4 will be described with reference to the flowchart of FIG. . This process is a subroutine executed from the image reading process.

  In S205, the CPU 80 determines whether or not the leading edge of the document being conveyed has passed the U-shaped section by executing a U-shaped section passage determination process to be described later. If the determination is affirmative (S205: Yes), a negative determination is made in S210. In the case of determination (S205: No), the process proceeds to S225.

  In S210, the CPU 80 executes a subsequent document presence / absence determination process to be described later to determine the presence / absence of a document conveyed next to the document that has passed through the U-shaped section. If the determination is affirmative (S210: Yes), the process proceeds to S215. If the determination is negative (S210: No), the process proceeds to S220.

  In S215, the CPU 80 executes an ADF cover half-open determination process to be described later to determine whether the open / closed state of the ADF cover 4 is a half-open state. If the determination is affirmative (S215: Yes), the process proceeds to S220. If the determination is negative (S215: No), the process proceeds to S225.

In S220, the CPU 80 determines that automatic document feeding can be continued, and ends this processing. In step S225, it is determined that automatic document feeding cannot be continued, and the process ends.
(3) U-character section passage determination process Next, a U-character section passage determination process for determining whether or not the leading edge of the document being conveyed has passed through the U-character section will be described with reference to the flowchart of FIG. To do. This process is a subroutine that is executed from the transportability determination process.

  In S305, the CPU 80 of the image reading apparatus 1 determines whether or not the R sensor 53 is ON. If the R sensor 53 is ON (S305: Yes), the CPU 80 determines that the process is S310, and if it is OFF (S305: No). Shifts the processing to S315.

  In S310, the CPU 80 determines that the leading edge of the document being conveyed has passed through the U-shaped section, and ends this process. In S315, the CPU 80 determines that the leading edge of the document being conveyed does not pass through the U-shaped section, and ends the present process.

(4) Next document presence / absence determination processing Next, next document presence / absence determination processing for determining the presence / absence of a document transported next to a document that has passed through the U-shaped section will be described with reference to the flowchart of FIG. . This process is a subroutine that is executed from the transportability determination process.

  In S405, the CPU 80 of the image reading apparatus 1 determines whether or not the F sensor 51 is ON. If the F sensor 51 is ON (S405: Yes), the process proceeds to S410, and if it is OFF (S405: No). Shifts the processing to S415.

  In S410, the CPU 80 determines that there is a document to be conveyed next to the document that has passed through the U-shaped section, and ends this process. In S415, the CPU 80 determines that there is no document to be conveyed next to the document that has passed through the U-shaped section, and ends this processing.

(5) ADF Cover Half-Open Determination Process Next, the ADF cover half-open determination process for determining whether or not the ADF cover 4 is in the half-open state will be described with reference to the flowchart of FIG. This process is a subroutine that is executed from the transportability determination process.

In S505, the CPU 80 reads an image with the back surface CIS 41, generates image data, and shifts the processing to S510.
In S <b> 510, the CPU 80 sets a white level threshold for determining the half-open state in accordance with ON / OFF of the RB sensor 52. Specifically, when the RB sensor 52 is ON, the back side CIS 41 is covered with the original, and it is considered that the white level of the image data is reduced. When the RB sensor 52 is OFF (that is, the back side CIS 41 is the original) The lower value is set as the threshold value of the white level compared to the case where the white level is not covered by the white level.

  Subsequently, in S515, the CPU 80 determines whether the white level of the generated image data is equal to or higher than the threshold set in S510, and determines the intensity of external light to be inserted into the reading surface of the back surface CIS 41. If the determination is affirmative (S515: Yes), the process proceeds to S525. If the determination is negative (S515: No), the process proceeds to S520.

  In S520, the CPU 80 determines that the ADF cover 4 is in a half-open state in which the document can be substantially conveyed in the open / close section covered by the ADF cover 4, and ends the present process. In S525, the CPU 80 determines that the ADF cover 4 is in an open state, and ends this process.

[effect]
According to the image reading apparatus 1 of the first embodiment, scanning by automatic document feeding can be started even when the ADF cover 4 is in a half-open state. Further, even when the ADF cover 4 is in a half-open state during execution of scanning by automatic document feeding, scanning can be continued.

  Even when the ADF cover 4 is open during scanning by automatic document feeding, the leading edge of the document being conveyed passes through the U-shaped section, and the document conveyed after this document If there is no, scanning of the document that has passed through the U-shaped section can be continued.

[Second Embodiment]
Next, the operation of the image reading apparatus 1 in the second embodiment will be described.
In the second embodiment, the same image reading process and the conveyance possibility determination process as in the first embodiment are executed. In the first embodiment, these processes are executed based on the open / closed state of the ADF cover 4. In the second embodiment, these processes are executed based on the open / closed state of the document cover 3. Here, the image reading process and the transportability determination process in the second embodiment will be described in comparison with the first embodiment.

(1) Image Reading Process First, the image reading process of the second embodiment will be described with reference to the flowchart of FIG.
In S105 of the first embodiment, the open / closed state of the ADF cover 4 is determined. On the other hand, in S105 of the second embodiment, the document cover sensor 10 makes the same determination for the document cover 3.

  In S110 of the first embodiment, image reading by the back surface CIS 41 is performed. On the other hand, in S110 of the second embodiment, image data is generated by the front surface CIS 43, and in subsequent S115, the open / close state of the original cover 3 can substantially convey the original in the open / close section covered by the original cover 3. It is determined whether it is half open.

  In S130 of the first embodiment, it is determined whether the ADF cover 4 is in a closed state. On the other hand, in S130 of the second embodiment, the document cover sensor 10 makes the same determination for the document cover 3.

  In S135 of the first embodiment, it is determined whether scanning is performed only on the front side of the document. In S135 of the second embodiment, it is determined whether scanning is performed only on the back side of the document. The

(2) About transportability determination process Next, the transportability determination process of the second embodiment will be described.
In S205 of the first embodiment, a U-shaped section passage determination process is executed to determine whether or not the leading edge of the document has passed the U-shaped section. On the other hand, in S205 of the second embodiment, instead of the U-shaped section passage determination process, a document presser passage determination process, which will be described later, is executed, and it is determined whether the leading edge of the document has passed the front-side document holder 44. Then, the process branches similarly in accordance with the determination result.

  In S215 of the first embodiment, ADF cover half-open determination processing is executed to determine whether the ADF cover 4 is in a half-open state. On the other hand, in S215 of the second embodiment, a document cover half-open determination process described later is executed instead of the ADF cover half-open determination process to determine whether the document cover 3 is in a half-open state. Then, the process branches similarly in accordance with the determination result.

(3) Document Presser Passage Determination Process Next, a flowchart of FIG. 8A shows a document presser part pass determination process for determining whether or not the leading edge of the document being conveyed has passed the front document presser 44. It explains using. This process is a subroutine that is executed from the transportability determination process in the second embodiment.

  In S605, the CPU 80 of the image reading apparatus 1 determines whether or not the sensor has been turned on for a predetermined time or more after the R sensor 53 is turned on. If the determination is affirmative (S605: Yes), the process proceeds to S610 on the assumption that the leading edge of the document has been conveyed by a predetermined distance from the position corresponding to the R sensor 53. If the determination is negative (S605: No), the process proceeds to S615. To migrate.

  In S <b> 610, the CPU 80 determines that the leading edge of the document has passed through the section pressed by the front-side document pressing unit 44, and ends this processing. In step S615, the CPU 80 determines that the leading edge of the document has not passed the section, and ends the process.

(4) Document Cover Half-Open Determination Processing Next, document cover half-open determination processing for determining whether or not the document cover 3 is in the half-open state will be described with reference to the flowchart of FIG. This process is a subroutine that is executed from the transportability determination process in the second embodiment.

In S705, the CPU 80 reads an image with the front surface CIS 43, generates image data, and shifts the processing to S710.
In S <b> 710, the CPU 80 sets a white level threshold for determining the half-open state in accordance with ON / OFF of the R sensor 53. Specifically, when the R sensor 53 is ON, the front surface CIS 43 is covered with the original, and it is considered that the white level of the image data is lowered. When the R sensor 53 is OFF (that is, the front surface CIS 43 is the original) The lower value is set as the threshold of the white level compared to the case where the white level is not covered.

  Subsequently, in S715, the CPU 80 determines whether the white level of the generated image data is greater than or equal to the threshold set in S710. If the determination is affirmative (S715: Yes), the process proceeds to S725, and a negative determination is made. In this case (S715: No), the process proceeds to S720.

  In S720, the CPU 80 determines that the document cover 3 is in a half-open state in which the document can be substantially conveyed in the open / close section covered by the document cover 3, and ends the present process. In S725, the CPU 80 determines that the document cover 3 is in the open state, and ends this process.

[effect]
According to the image reading apparatus 1 of the second embodiment, scanning by automatic document feeding can be started even when the document cover 3 is in a half-open state. Further, even when the document cover 3 is in a half-open state during execution of scanning by automatic document feeding, scanning can be continued.

  Further, even when the document cover 3 is opened during scanning by automatic document feeding, the leading edge of the document being conveyed passes through a position corresponding to the front document pressing unit 44, and If there is no document conveyed after this document, the document that has passed through the position can be continuously scanned.

[Other Embodiments]
(1) If it is determined in the conveyance determination process in the first embodiment that the document does not pass through the U-shaped section (S205: No), it is further determined whether or not the ADF cover 4 is in a half-open state. In the case of determination, it may be determined that automatic document feeding can be continued. In this way, it can be determined with higher accuracy whether or not automatic document feeding can be continued.

  (2) If it is determined in the transportability determination process in the second embodiment that the document has not passed through the front-side document pressing portion 44 (S205: No), whether the document cover 3 is in a half-open state or not. If the determination is affirmative, it may be determined that automatic document feeding can be continued. In this way, it can be determined with higher accuracy whether or not automatic document feeding can be continued.

[Correspondence with Claims]
The correspondence between the terms used in the description of the above embodiment and the terms used in the description of the claims is shown.

  The document cover sensor 10 and the ADF cover sensor 20 are used as a closed position detecting unit, and the conveyance unit 30, the image reading unit 40, and the CPU 80 are used as a reading control unit. S715 of the determination process corresponds to an external light detection unit, and the RB sensor 52 and the R sensor 53 correspond to a reading surface determination unit.

In the first embodiment, the back surface CIS 41 corresponds to the first reading means, the front surface CIS 43 corresponds to the second reading means, and the R sensor 53 corresponds to the first passage determining means.
Further, in the second embodiment, the front surface CIS 43 is used as the first reading unit, the back surface CIS 41 is used as the second reading unit, S605 and S610 of the document presser passage determination process are used as the second passage determination unit, and the front side document pressing unit 44. Corresponds to first document pressing means.

  DESCRIPTION OF SYMBOLS 1 ... Image reading apparatus, 2 ... Document placing table, 3 ... Document cover, 4 ... ADF cover, 10 ... Document cover sensor, 20 ... ADF cover sensor, 30 ... Conveyance section, 31 ... Document feeding section, 32 ... Conveyance roller , 33 ... Document discharge section, 40 ... Image reading section, 41 ... Back side CIS, 42 ... Back side document pressing part, 43 ... Front side CIS, 44 ... Front side document pressing part, 50 ... Original sensor, 51 ... F sensor 52 ... RB sensor, 53 ... R sensor, 60 ... RAM, 70 ... ROM, 80 ... CPU, 90 ... internal bus.

Claims (8)

A cover movably provided between a closed position that covers an open / close section that is a part of a document transport path and an open position that opens the open / close section;
Closed position detecting means for detecting whether the cover is located at the closed position;
First reading means for reading an image of one side of the document in the opening / closing section;
Read control means for carrying the original reading process for conveying the original along the conveyance path, reading an image on one side of the original by the first reading means, and generating image data;
An external light detection means for performing image reading by the first reading means, and detecting the intensity of external light inserted into the opening / closing section from the outside of the device based on image data generated by the image reading;
With
When the closed position detecting means determines that the cover is not located at the closed position, the reading control means determines the original according to the intensity of the external light detected by the external light detecting means. Determining the execution status of the reading process;
An image reading apparatus. The image reading apparatus according to claim 1,
The reading control means receives an instruction from the outside to start the document reading processing, and when the closed position detecting means determines that the cover is not located at the closed position, the outside light detecting means If the intensity of the external light detected by the step is within an allowable range, the processing is started.
An image reading apparatus. The image reading apparatus according to claim 1 or 2,
The reading control means detects the outside light detected by the outside light detecting means when the closed position detecting means determines that the cover is not located at the closed position during the document reading process. If the strength is outside the acceptable range, stop the process;
An image reading apparatus. The image reading apparatus according to claim 3.
A reading surface determination unit that detects a position of the document conveyed by the reading control unit and determines whether the reading surface of the first reading unit is covered by the document based on the position;
When the determination result by the reading surface determination unit is affirmative, the reading control unit is detected by the outside light detection unit because the reading surface of the first reading unit is covered with the document. Taking into account that the intensity of the outside light decreases, and determining the execution state of the document reading process according to the intensity of the outside light;
An image reading apparatus. The image reading apparatus according to claim 1, wherein:
The first reading unit is installed corresponding to an upstream reading position on the opening / closing section in the transport path, and performs image reading of one side of the document passing through the upstream reading position,
In the transport path, the second side is installed corresponding to the downstream reading position downstream of the opening / closing section with reference to the transport direction of the document, and performs image reading on the other surface of the document passing through the position. Further comprising reading means;
In the document reading process, the reading control unit reads an image of one surface of the document by the first reading unit while passing the document through the upstream reading position, and reads the document on the downstream side. Reading the image on the other side of the document by the second reading means while passing the reading position, and generating image data on both sides of the document in parallel;
An image reading apparatus. The image reading apparatus according to claim 5.
As a partial section in the transport path, it has a U-shaped section that is a section curved in a U-shape,
The opening / closing section is provided on the upstream side of the U-shaped section on the basis of the conveyance direction of the document, and the downstream reading position is provided on the downstream side of the U-shaped section,
First passage determining means for determining whether or not the document has passed a predetermined position downstream from the starting point of the U-shaped section with respect to the transport direction;
The reading control means includes
Sequentially executing the document reading process on the plurality of documents placed on the document feeder provided at the starting point of the transport path;
When the closed position detection unit determines that the cover is not positioned at the closed position during the document reading process, if the determination result by the first passage determination unit is an affirmative determination, For the document relating to the determination by the first passage determination unit, the process is continuously executed regardless of the intensity of the external light detected by the external light detection unit.
An image reading apparatus. The image reading apparatus according to claim 1, wherein:
The first reading means is installed corresponding to a downstream reading position on the opening / closing section in the transport path, and performs image reading of one side of the document passing through the downstream reading position,
In the transport path, the second side is installed corresponding to the upstream reading position on the upstream side of the opening / closing section with reference to the transport direction of the document, and performs image reading on the other surface of the document passing through the position. Further comprising reading means;
In the document reading process, the reading control unit reads an image of one surface of the document by the first reading unit while passing the document through the downstream reading position, and reads the document on the upstream side. Reading the image on the other side of the document by the second reading means while passing the reading position, and generating image data on both sides of the document in parallel;
An image reading apparatus. The image reading apparatus according to claim 7.
As a partial section in the transport path, it has a U-shaped section that is a section curved in a U-shape,
The opening / closing section is provided on the downstream side of the U-shaped section with respect to the transport direction of the document, and the upstream reading position is provided on the upstream side of the U-shaped section,
First document pressing means for pressing the document passing through the downstream reading position against the reading surface of the first reading means;
Second passage determining means for determining whether or not the document has passed a predetermined position downstream of the downstream reading position with reference to the transport direction of the document;
Further comprising
The reading control means includes
Sequentially executing the document reading process on the plurality of documents placed on the document feeder provided at the starting point of the transport path;
When the closed position detection unit determines that the cover is not positioned at the closed position during the document reading process, if the determination result by the second passage determination unit is a positive determination, For the document relating to the determination by the second passage determination unit, the process is continuously executed regardless of the intensity of the external light detected by the external light detection unit;
An image reading apparatus.

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