JP6549929B2 - Document size detection device and image reading device - Google Patents

Description

  The present invention relates to a document size detection device and an image reading device that detect the size of a document to be read.

  The conventional document size detection device detects the opening angle of the document pressure plate for pressing the document in two steps according to the state of the optical sensor, and turns on the document size detection sensor when the opening angle of the first step is detected. When the second opening angle lower than the opening angle is detected, the size of the document is determined based on the output result of the document size detection sensor (see, for example, Patent Document 1).

Unexamined-Japanese-Patent No. 2004-258386

However, in the prior art, when the first stage of the opening angle of the original pressure plate for holding the original continues, the power of the original size detection sensor continues to be turned on, which consumes unnecessary power. There is.
An object of the present invention is to solve such a problem, and it is an object of the present invention to suppress the consumption of power by a document size detection sensor.

Therefore, according to the present invention, a document table on which a document is placed, a document pressure plate provided so as to be openable and closable with respect to the document table, an opening / closing detection means for detecting the opening and closing of the document pressure plate, and the document table A document size detection unit for detecting the size of the original document, a storage unit for storing the detection result of the document size detection unit, and detection of closing of the document pressure plate by the open / close detection unit to the document size detection unit start the feeder, the possess and the detection result of the document size detection means stored in the storage unit and a control unit for stopping power supply to the document size detection means, said opening and closing detecting means, the document size detection means When the distance between the document table and the document pressure plate at the position where the document is placed becomes a predetermined distance, it is detected that the document pressure plate is closed, and the document size detection means is constituted by a plurality of document size detection means Place The opening / closing detection means is configured to set the distance between the document table and the document pressure plate to a predetermined distance at a position at which the document size detection means is disposed such that the distance to the rotation shaft of the document pressure plate is shortest. It is characterized in that the closing of the original pressure plate is detected .

  According to the present invention as described above, it is possible to suppress the consumption of power by the document size detection sensor.

Block diagram showing control configuration of document size detection apparatus in the embodiment Schematic side sectional view showing the configuration of the image reading apparatus in the embodiment Schematic plan view showing the configuration of the image reading apparatus in the embodiment Flowchart showing a flow of document size detection processing in the embodiment Time chart of power control of document size detection sensor in the embodiment An explanatory view of the document size determination in the embodiment An explanatory view of a document size determination table in the embodiment An explanatory view of A4R document size determination in the embodiment

  Hereinafter, embodiments of a document size detection apparatus and an image reading apparatus according to the present invention will be described with reference to the drawings.

FIG. 2 is a schematic side sectional view showing the configuration of the image reading apparatus in the embodiment, and FIG. 3 is a schematic plan view showing the configuration of the image reading apparatus in the embodiment. FIG. 3 is a plan view of the document table on which the document is placed as viewed from above.
In FIG. 2 and FIG. 3, the image reading apparatus 100 has an original size detection apparatus for detecting the size (size) of an original to be read, and is, for example, a scanner apparatus having an image reading function. The image reading apparatus 100 includes an original table 102, an image reading sensor 103, an original pressure plate 104, sensor flags 105 and 113, open / close sensors 106 and 112, a housing 107, an original table size label 108, and an original alignment. A mark 109 and document size detection sensors 110 and 111 are provided.

The document table 102 is made of transparent glass on which the document 101 as an image reading object is placed. In the present embodiment, it is assumed that the document table 102 has such a size that the A3 size document 101 can be placed as the maximum size document 101.
The image reading sensor 103 irradiates light to the document 101 placed on the document table 102, reads the reflected light with a CCD (Charge Coupled Device) sensor or the like, and generates image data. The image reading sensor 103 is configured to be movable in the sub scanning direction, and reads an original while moving in the sub scanning direction.

  The document pressure plate 104 is provided so as to be able to open and close with respect to the document table 102, and presses the document 101 placed on the document table 102 against the document placement surface of the document table 102. The document pressure plate 104 is rotatably provided with a rotary shaft 104a provided on the back side of the image reading apparatus 100 as a rotation fulcrum, and the front side of the image reading apparatus 100 operated by the user is a free end.

  Therefore, the document 101 is placed on the document table 102 by rotating the front side of the image reading apparatus 100 of the document pressure plate 104 upward by the operation of the user to open the document placement surface of the document table 102. It can be done. When the document 101 placed on the document table 102 is read by the image reading sensor 103, the document 101 is pressed against the document table 102 and the front side of the image reading apparatus 100 of the document pressure plate 104 is downward to prevent entry of disturbance light. The document mounting surface of the document table 102 is closed.

  The sensor flag 105 is slidably disposed on the back side of the image reading apparatus 100 on the side of the rotation shaft 104a, which is a rotation fulcrum of the document pressure plate 104, and moves in contact with the rotating document pressure plate 104. The sensor flag 105 is biased toward the document pressure plate 104 by biasing means such as a spring. Therefore, when the front side of the image reading apparatus 100 of the document pressure plate 104 is rotated downward, the sensor flag 105 is pushed and moved in the direction indicated by the arrow A in FIG. When the front side of the image reading apparatus 100 is pivoted upward, the biasing means moves in the direction indicated by the arrow B in the figure.

  The sensor flag 113 is slidably disposed on the front side of the image reading apparatus 100 on the side opposite to the rotation shaft 104 a which is the rotation supporting point of the document pressure plate 104, and moves in contact with the rotating document pressure plate 104. . The sensor flag 113 is biased toward the document pressure plate 104 by biasing means such as a spring. Therefore, when the front surface side of the image reading apparatus 100 of the document pressure plate 104 is rotated downward, the sensor flag 113 is pushed and moved in the direction indicated by the arrow A in the figure by the document pressure plate 104 in contact. When the front side of the image reading apparatus 100 is rotated upward, the biasing means moves in the direction indicated by the arrow B in the figure.

An open / close sensor 106 as a first open / close detection unit detects an open state and a closed state of the document pressure plate 104. The open / close sensor 106 is formed of an optical sensor or the like, and detects the sensor flag 105 moving to detect the open state and the closed state of the document pressure plate 104.
An open / close sensor 112 as a second open / close detection unit detects an open state and a closed state of the document pressure plate 104. The open / close sensor 112 is formed of an optical sensor or the like, and detects a sensor flag 113 which is moved, and detects whether or not the document pressure plate 104 is in a closed state in which the document platen 102 is in contact.

  A document size label 108 is provided on the outer periphery of the document table 102, and indicates the size of the document 101 placed on the document alignment mark 109 (B6, A5, B5, A4, B5R, A4R, B4R, A3, etc. are written. B6, A5, B5, and A4 indicate the case where the document is placed on the document table 102 with the longitudinal direction of the document of each size as the main scanning direction and the short direction as the subscanning direction, and B5R, A4R, and B4. B4R is a notation when the document is placed on the document table 102 with the longitudinal direction of the document of each size of B5, A4 and B4 as the sub-scanning direction and the short direction as the main scanning direction. Note that A3 is a notation in the case where the document is placed on the document table 102 with the longitudinal direction of the document as the sub scanning direction and the short direction as the main scanning direction.

  The document alignment mark 109 is for aligning one vertex of the document placed on the document table 102. The user places the document 101 on the document table 102 with one vertex of the document 101 aligned with the document alignment mark 109. In FIG. 3, the area represented by the broken lines on two sides corresponds to the size (B6, A5, B5, A4, B5R, A4R, B4R) of the document placed on the document table 102 in alignment with the document alignment mark 109. It represents the corresponding area.

  A document size detection sensor 110 and a document size detection sensor 111 as document size detection means are sensors that detect the size (size) of the document 101 placed on the document table 102 with one vertex aligned with the document alignment mark 109. is there. The document size detection sensor 110 and the document size detection sensor 111 are, for example, reflection type optical sensors, and emit light emitted from the light emitting element to the document 101, receive the reflected light by the light receiving element, and measure the size of the document 101. To detect

  As shown in FIG. 3, the document size detection sensor 110 is disposed outside the document size area of A4 indicated by the broken line in the sub scanning direction and inside the area of the document size of B5R. In the document size detection sensor 110, whether the document 101 of B6, A5, B5, or A4 size is placed on the document table 102 with the longitudinal direction as the main scanning direction and the short direction as the subscanning direction, B5, A4, B4 It is detected whether the A3 size document 101 is placed on the document table 102 with the longitudinal direction as the subscanning direction and the short direction as the main scanning direction.

  As shown in FIG. 3, the document size detection sensor 111 is disposed outside the A4R document size area represented by the broken line and inside the B4R document size area. The document size detection sensor 111 is used to detect a letter size document 101 and a legal size document 101.

In the present embodiment, in the main scanning direction, the distance between the document size detection sensor 111 and the document alignment mark 109 is larger than the distance between the document size detection sensor 110 and the document alignment mark 109.
A housing 107 covers the image reading sensor 103, the open / close sensors 106 and 112, the document size detection sensors 110 and 111, and the like.

FIG. 1 is a block diagram showing a control configuration of the document size detection apparatus in the embodiment.
In FIG. 1, the document size detection device 120 includes an image reading sensor 103, open / close sensors 106 and 112, document size detection sensors 110 and 111, a sensor value storage unit 114, a document size detection control unit 115, and sensor power supply. And a supply unit 116.
The document size detection device 120 is provided in the image reading device 100 shown in FIGS. 2 and 3. Further, the descriptions of the image reading sensor 103, the open / close sensors 106 and 112, and the document size detection sensors 110 and 111 are omitted since they are described above.

The sensor power supply unit 116 supplies power to the document size detection sensor 110 and the document size detection sensor 111.
A sensor value storage unit 114 as a storage unit is a memory or the like that stores output results of the document size detection sensor 110 and the document size detection sensor 111 as numerical values.
A document size detection control unit 115 as a control unit controls the image reading sensor 103, the sensor power supply unit 116, and the sensor value storage unit 114, and the document 101 placed on the document table 102 shown in FIG. 2 and FIG. Control to detect the size of

In the present embodiment, when the document size detection control unit 115 detects the closing of the document pressure plate 104 shown in FIG. 2 by the open / close sensor 106, the sensor power supply unit 116 starts supplying power to the document size detection sensors 110 and 111. When the detection results of the size detection sensors 110 and 111 are stored in the sensor value storage unit 114, the sensor power supply unit 116 stops the power supply to the document size detection sensors 110 and 111.
Further, the document size detection control unit 115 has a control unit such as a CPU (Central Processing Unit) and a storage unit such as a memory, and the entire document size detection device 120 is based on a control program (software) stored in the storage unit. Control the operation of

The operation of the above-described configuration will be described.
First, the document size detection process performed by the document size detection apparatus will be described with reference to FIG. 1, FIG. 2 and FIG. 3 in accordance with the steps represented by S in the flowchart showing the flow of the document size detection process in the embodiment of FIG. .
The document size detection control unit 115 of the document size detection device 120 starts the document size detection process when the power is turned on.

S1: The document size detection control unit 115 monitors the state of the open / close sensor 106, and when detecting that the document pressure plate 104 has been opened, shifts the processing to S2.
The document size detection control unit 115 detects that the document pressure plate 104 has been opened by the operation of the user using the open / close sensor 106. The user places the original pressure plate 104 in the open state, places one vertex of the original on the original alignment mark 109 and places the original on the original table 102.

S2: The document size detection control unit 115 monitors the state of the open / close sensor 106, stands by until the document pressure plate 104 is closed, and shifts the processing to S3 when detecting that the document pressure plate 104 is closed .
The user who placed the original on the original table 102 closes the original pressure plate 104.
S3: When the document size detection control unit 115 detects that the document pressure plate 104 is in the closed state, it instructs the sensor power supply unit 116 to start the sensor power supply to the document size detection sensor 110 and the document size detection sensor 111. . The sensor power supply unit 116 starts power supply to the document size detection sensor 110 and the document size detection sensor 111 in accordance with an instruction from the document size detection control unit 115.

S4: The document size detection control unit 115 stands by until a predetermined predetermined time elapses until the document size detection sensor 110 and the document size detection sensor 111 which are supplied with power are turned on (up to activation).
S5: If the document size detection control unit 115 detects that a predetermined time has elapsed, it instructs the sensor value storage unit 114 to store the output values of the document size detection sensor 110 and the document size detection sensor 111. The sensor value storage unit 114 stores output values from the document size detection sensor 110 and the document size detection sensor 111 in accordance with an instruction from the document size detection control unit 115.

  S6: When the sensor value storage unit 114 stores the output values from the document size detection sensor 110 and the document size detection sensor 111, the sensor value storage unit 114 notifies the document size detection control unit 115 of a signal of storage completion of the sensor output value. When receiving the storage completion signal from the sensor value storage unit 114, the document size detection control unit 115 instructs the sensor power supply unit 116 to stop the sensor power supply to the document size detection sensor 110 and the document size detection sensor 111.

S7: The document size detection control unit 115 monitors the state of the open / close sensor 112, and when the user detects that the document pressure plate 104 is further closed and the document pressure plate 104 is closed, the process proceeds to S9. On the other hand, if it is in the open state, the process proceeds to S8.
S8: When the original pressure plate 104 is in the open state, the original size detection control unit 115 confirms the state of the open / close sensor 106, and when the original pressure plate 104 is in the closed state, the process proceeds to S7 and the original pressure plate 104 is open In the case of, the process proceeds to S2.

S9: When the document size detection control unit 115 detects that the document pressure plate 104 is closed by the open / close sensor 112, the document size detection control unit 115 operates the image reading sensor 103 to detect the document size in the main scanning direction in FIG. Performs scanning direction document size detection processing.
S10: When the document size detection control unit 115 completes the document size detection process in the main scanning direction, the output values from the document size detection sensor 110 and the document size detection sensor 111 stored in the sensor value storage unit 114 and the image reading sensor A document size determination process is performed to determine the size of the document 101 placed on the document table 102 based on the document size in the main scanning direction detected in step 103, and the process ends. The details of the document size determination process will be described later.

Next, the switching position of the open / close state of the open / close sensor 106 described above will be described based on FIGS. 1 and 2. The position at which the open / close sensor 106 detects the closed state of the document pressure plate 104 is the time during which the sensor value storage unit 114 can store the output value from the document size detection sensor 110 and the document size detection sensor 111 under the control of the document size detection control unit 115 Should be set to ensure.
In the present embodiment, the open / close sensor 106 closes the document pressure plate 104 when the distance between the document table 102 and the document pressure plate 104 at the position where the document size detection sensor 110 is disposed becomes equal to or less than a predetermined distance (D3). It is made to detect.

The position where the open / close sensor 106 detects the closed state of the document pressure plate 104 will be described below.
In FIG. 2, the distance D 1 is set between the document platen 102 and the document pressure plate 104, which can detect the presence or absence of the document 101 placed on the document platen 102 by the document size detection sensor 110 above the document size detection sensor 110. It is the shortest distance.

  The document size detection sensor 110 and the document size detection sensor 111 irradiate the light emitted from the light emitting element to the document, and the reflected light is detected by the light receiving element to detect the presence or absence of the document. Therefore, if the distance between the document table 102 and the document pressure plate 104 becomes smaller than D1 above the document size detection sensor 110, the presence or absence of the document can not be detected correctly by the reflected light of the light irradiated to the document pressure plate 104. It will

  Therefore, it is necessary to use the output value of the document size detection sensor 110 when the distance between the document table 102 and the document pressure plate 104 is D1 or more above the document size detection sensor 110. Although the distance D1 is determined by the specifications of the light emitting element and the light receiving element of the document size detection sensor 110, the distance D1 is set to 60 mm in this embodiment.

In the distance D2, the sensor value storage unit 114 detects the document size detection sensor 110 after the open / close sensor 106 detects the closed state of the document pressure plate 104 and power supply to the document size detection sensor 110 and the document size detection sensor 111. And, in the time until the output value of the document size detection sensor 111 is stored, the document pressure plate 104 is a movable distance by the operation of the user above the document size detection sensor 110.
Here, the open / close state of the open / close sensor 106 and the time until the document size detection sensors 110 and 111 are supplied with power and activated will be described based on a time chart shown in FIG. 5 with reference to FIG.

  In FIG. 5, after the open / close sensor 106 is opened, the document size detection control unit 115 instructs the sensor power supply unit 116 to start power supply to the document size detection sensor 110 and the document size detection sensor 111. It is the firmware processing time until the document size detection sensor 110 and the document size detection sensor 111 are powered on (turned on). In this embodiment, the time T1 is 10 ms.

  T2 is a start time of the document size detection sensor 110 and the document size detection sensor 111. The time T2 is determined by the specifications of the document size detection sensor 110 and the document size detection sensor 111, but is generally about 1 ms. In this embodiment, the time T2 is 1 ms.

  In T3, after time T2 elapses, the document size detection control unit 115 instructs the sensor value storage unit 114 to store the output values of the document size detection sensor 110 and the document size detection sensor 111, and the document size detection sensor 110 and the document This is the firmware processing time until the output value of the size detection sensor 111 is stored in the sensor value storage unit 114. In this embodiment, the time T3 is 10 ms.

Time T4 is the total time of time T1, time T2, and time T3. In this embodiment, time T4 = 10 ms + 1 ms + 10 ms = 21 ms.
On the other hand, it is known from the experimental results that the speed at which the user closes the document pressure plate 104 is 0.66 m / s at a high speed above the document size detection sensor 110. Therefore, the distance the original pressure plate 104 moves at time T4 = 21 ms is 13.86 mm.

Returning to the explanation of FIG. 2, the distance at which the document pressure plate 104 moves at time T4 = 21 ms is 13.86 mm. Therefore, in this embodiment, the distance D2 is 15 mm. Further, since the distance D3 is the distance D1 + the distance D2, the distance D3 is 75 mm in this embodiment.
The sensor flag 105 is configured such that the output of the open / close sensor 106 is closed when the distance between the document table 102 and the document pressure plate 104 reaches the distance D3 (= 75 mm) above the document size detection sensor 110. It is done.

  That is, the period from when the open / close sensor 106 detects the closed state of the original pressure plate 104 to when the output value of the original size detection sensor 110 and the original size detection sensor 111 is stored in the sensor value storage unit 114 elapses. If the speed at which the document pressure plate 104 moves toward the document table 102 is A (m / s = mm / ms) above the document size detection sensor 110, the distance D2 (mm) is the speed A (mm). / Ms) x time T4 (ms) or more.

Further, assuming that the total distance of the distance D1 determined by use of the document size detection sensor 110 and the document size detection sensor 111 and the above distance D2 is the distance D3, the open / close sensor 106 is a document above the document size detection sensor 110. When the distance between the table 102 and the document pressure plate 104 becomes the distance D3, the document pressure plate 104 is configured to switch between the open state and the closed state.
In addition, since the time T4 or more can be secured even above the document size detection sensor 111 where the distance to the rotational shaft 104a is larger than the document size detection sensor 110, the document size detection sensor 111 outputs the presence or absence of a document. It can be detected.

That is, when a plurality of document size detection sensors are provided, all document size detection is performed by securing the distance D3 above the document size detection sensor having the shortest distance from the rotation shaft 104a and securing the time T4 or more. It becomes possible to detect the presence or absence of the original by the output of the sensor.
Therefore, when the document size detection sensor 111 is arranged such that the distance to the rotation shaft 104 a is smaller than the document size detection sensor 110, the document size detection sensor is secured by securing time T 4 or more above the document size detection sensor 111. The presence or absence of the document can be detected by the output of the document size detection sensor 111 and the document size detection sensor 110.

By configuring the open / close sensor 106 in this manner, the document size detection sensor 110 and the original size are detected after the open / close sensor 106 detects the closed state of the original pressure plate 104 above the original size detection sensor 110 and the original size detection sensor 111. Since the time until the output value of the detection sensor 111 is stored in the sensor value storage unit 114 is T4 or more, the presence or absence of the document can be detected by the output of the document size detection sensor 110 and the document size detection sensor 111.
Next, the document size determination process performed by the document size detection control unit 115 will be described based on FIGS. 6 and 7 with reference to FIG. The document size determination process is a process performed in S10 of FIG.

First, the document size detection control unit 115 uses the image reading sensor 103 to determine whether the end portion of the document placed on the document table 102 exists in the detection area 1, detection area 2 and detection area 3 in FIG. (Presence or absence) is determined, and document size detection processing in the main scanning direction is performed to detect the document size in the main scanning direction. (Document size detection process in the main scanning direction performed in S9 of FIG. 4)
Next, the document size detection control unit 115 detects the document size in the main scanning direction which is the result of the document size detection process in the main scanning direction, the document size detection sensor 110 and the document size detection sensor 111 stored in the sensor value storage unit 114. A document size determination process is performed based on the output value from.

The document size detection control unit 115 determines the document size by referring to the determination table 70 shown in FIG. 7 based on the document size in the main scanning direction and the output values from the document size detection sensor 110 and the document size detection sensor 111. Do.
A determination table 70 shown in FIG. 7 is a table configured by the main scanning direction document size detection processing result 71, the document size detection sensor output value 72, and the document size 73 to be determined.
The main scanning direction document size detection processing result 71 is the result of the main scanning direction document size detection processing described above, and is the presence or absence of the document end in the detection area 1, detection area 2 and detection area 3 shown in FIG.

The document size detection sensor output value 72 is an output value from the document size detection sensor 110 and the document size detection sensor 111 stored in the sensor value storage unit 114, and is detected by the document size detection sensor 110 and the document size detection sensor 111. There is no manuscript.
The document size 73 to be determined is a document size corresponding to the document end presence / absence of the main scanning direction document size detection processing result 71 and the document presence / absence of the document size detection sensor output value 72.
The document size detection control unit 115 determines the document size based on the document end presence / absence result of the main scanning direction document size detection processing 71 and the document presence / absence of the document size detection sensor output value 72.

  For example, as shown in FIG. 8, when the A4 size document is placed on the document table 102 in alignment with the document alignment mark 109 so that the short direction is the main scanning direction and the longitudinal direction is the subscanning direction, main scanning The end of the document is detected in the detection area 2 as the direction document size detection processing result, and the document size detection sensor 110 detects the presence of the document and the document size detection sensor 111 detects the absence of the document. From the above, the document size is determined to be "A4R".

As described above, when the open / close sensor 106 detects that the document pressing plate 104 is closed by the document size detection device 120, the power of the document size detection sensors 110 and 111 is supplied and the output values of the document size detection sensors 110 and 111 are stored. After that, by providing the document size detection control unit 115 for stopping the supply of power of the document size detection sensors 110 and 111, the power consumed by the document size detection sensors 110 and 111 can be minimized.
Further, the life of the document size detection sensors 110 and 111 can be extended.

As described above, in the present embodiment, when the open / close sensor detects a state where the document pressure plate is closed, the document size detection sensor is supplied with power, and the output value of the document size detection sensor is stored. By providing the control unit for stopping the supply of the power supply, the effect of being able to minimize the power consumed by the document size detection sensor can be obtained.
In addition, the life of the document size detection sensor can be extended.
Although the image reading apparatus has been described as a scanner apparatus in the present embodiment, the present invention is not limited thereto, and may be a copying machine, a facsimile apparatus, a multi-functional peripheral (MFP) or the like as long as it has an image reading function.

100 image reading apparatus 102 document table 103 image reading sensor 104 document pressure plate 105, 113 sensor flag 106, 112 open / close sensor 109 document alignment mark 110, 111 document size detection sensor 114 sensor value storage unit 115 document size detection control unit 116 sensor power supply Part 120 Document Size Detection Device

Claims (5)

A platen for placing originals,
A document pressure plate provided so as to be openable and closable with respect to the document table;
Opening / closing detection means for detecting the opening / closing of the original document pressure plate;
Document size detection means for detecting the size of a document placed on the document table;
A storage unit for storing the detection result of the document size detection unit;
When the closing of the document pressure plate is detected by the open / close detection unit, power supply to the document size detection unit is started, and when the detection result of the document size detection unit is stored in the storage unit, power supply to the document size detection unit is stopped. Control unit, and
I have a,
The open / close detection unit detects the closing of the document pressure plate when the distance between the document table and the document pressure plate at the position where the document size detection unit is arranged becomes a predetermined distance,
When the document size detection unit is composed of a plurality of document size detection units:
When the distance between the document table and the document pressure plate becomes a predetermined distance at a position where the document size detection device is disposed, the opening / closing detection device is disposed at a position where the document size detection device is arranged such that the distance to the rotation shaft of the document pressure plate is shortest. A document size detection device characterized by detecting closing of a pressure plate . In the document size detection apparatus according to claim 1 ,
The predetermined distance starts the power supply to the document size detecting unit and the shortest distance between the document table and the document pressure plate, which enables the document size detecting unit to detect the document placed on the document table. A document size detection apparatus characterized in that it is a total distance with a distance by which the document pressure plate can be moved by the user's operation from when the document size detection means detects the detection result of the document size detection means. . In the document size detection device according to claim 1 or 2 ,
The control unit starts feeding power to the document size detection unit, and stores the detection result of the document size detection unit in the storage unit after the document size detection unit is activated. apparatus. The document size detection apparatus according to any one of claims 1 to 3
The document size detection apparatus according to claim 1, wherein the control unit stops supplying power to the document size detection unit after receiving from the storage unit a notification that the detection result of the document size detection unit has been stored. . An image reading apparatus comprising the document size detection apparatus according to any one of claims 1 to 4 .

Images