JP2014011766A - Image reading device, opening/closing detection device, and program therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image reading device capable of preventing an opening/closing member covering a document platen in an openable/closable manner from being opened in the case other than image reading processing.SOLUTION: An image reading processing control unit 600 detects completion of image reading processing, and outputs an opening/closing detection signal. A light-emitting member 50 emits light with a light intensity lower than that during the image reading processing by processing of a light-emitting member processing unit 610. A light intensity comparison unit 626 determines whether or not a platen cover part 110 is closed from received reading data; and when the platen cover part 110 is opened, a warning unit 630 notifies a user of the fact that the platen cover part 110 is opened.

Description

  The present invention relates to an image reading device, an open / close detection device, and a program thereof.

  Patent Document 1 detects the open / closed state of the upper surface of the document table by the document cover, and determines whether or not to execute the document movement mode, so that the document is transported in a state where the upper surface of the document table is not completely closed by the document cover. An open / close detection device for an original reading apparatus that can reliably prevent the occurrence of an original jam at the original reading position due to the above is disclosed.

JP 2001-56515 A

  An object of the present invention is to provide an image reading apparatus capable of preventing an open / close member that freely opens and closes a document table from being opened in cases other than image reading processing.

  The present invention according to claim 1 is directed to an image reading unit that reads an image formed on a document, a document table on which a document on which an image is read by the image reading unit is placed, and a document placed on the document table. A light emitting member that emits light; an opening and closing member that covers the document table so as to be openable and closable; and an opening and closing detection unit that performs a process for detecting opening and closing of the opening and closing member. A light emitting member control unit that controls to turn on the light when the image reading unit is not reading an image, and a reading by the image reading unit when the light emitting member control unit controls the light emitting member to be turned on. And an image reading device having detection means for detecting opening and closing of the opening and closing member based on the value.

  According to a second aspect of the present invention, the light emitting member control means causes the light emitting member to emit a smaller amount of light than when the image reading unit reads an image when the image reading unit is not reading a document. The image reading apparatus according to claim 1, wherein the image reading apparatus is controlled to be lit.

  According to a third aspect of the present invention, the opening / closing detection unit includes warning means for notifying a warning indicating that the opening / closing member is open when the detection means detects that the opening / closing member is open. The image reading apparatus according to claim 1, further comprising:

  According to a fourth aspect of the present invention, the opening / closing detection unit detects the opening / closing of the opening / closing member again after the first period has elapsed when the detection means detects that the opening / closing member is open. The image reading apparatus according to claim 1, wherein the image reading apparatus performs processing for the purpose.

  According to a fifth aspect of the present invention, when the opening / closing detection unit detects that the opening / closing member is closed by the detection means, after the second period longer than the first period has elapsed, The image reading apparatus according to claim 4, wherein a process for detecting opening / closing of the opening / closing member is performed.

  According to the sixth aspect of the present invention, when an image reading unit that reads an image formed on a document does not read an image, the document is placed on a document table on which a document on which an image is read by the image reading unit is placed. On the other hand, when the light emitting member control means that controls the light emitting member that emits light to be turned on, and the light emitting member control means that the light emitting member is turned on, based on the reading value by the image reading unit, And an open / close detection device having detection means for detecting opening / closing of an open / close member that covers the document table in an openable / closable manner.

  According to a seventh aspect of the present invention, there is provided a document placed on a document table on which a document on which an image is read by the image reading unit is read when the image reading unit that reads an image formed on the document is not reading an image. On the other hand, when the light emitting member control step for controlling the light emitting member that emits light to be turned on, and the light emitting member control step for controlling the light emitting member to be turned on, based on the reading value by the image reading unit, A program for causing a computer to execute a detection step of detecting opening and closing of an opening and closing member that covers the document table so as to be freely opened and closed.

  According to the first aspect of the present invention, it is possible to provide an image reading apparatus capable of preventing the opening / closing member that covers the document table from being opened and closed in cases other than image reading processing.

  According to the second aspect of the present invention, in addition to the effect obtained by the first aspect of the present invention, compared with the case where the present configuration is not provided, even if the opening / closing member is open, the user can It is possible to provide an image reading apparatus capable of executing open / close detection processing so as not to be dazzled.

  According to the third aspect of the present invention, in addition to the effect obtained by the first aspect of the present invention, it is possible to provide an image reading apparatus capable of notifying the user that the opening / closing member is in an open state.

  According to the fourth aspect of the present invention, in addition to the effect obtained by the first aspect of the present invention, the opening / closing member is more reliably opened compared to the case where the present configuration is not provided. It is possible to provide an image reading apparatus that can prevent the above.

  According to the present invention of claim 5, in addition to the effect obtained by the present invention of claim 4, compared to the case without this configuration, the open / close member can be used for a long time while suppressing power consumption. It is possible to provide an image reading apparatus that can prevent an open state.

  According to the sixth aspect of the present invention, it is possible to provide an open / close detection device that can prevent the open / close member that covers the document table from being opened and closed in cases other than the image reading process.

  According to the seventh aspect of the present invention, it is possible to provide a program capable of preventing an open / close member that freely opens and closes the document table from being opened in cases other than image reading processing.

1 is a front view illustrating an image forming apparatus according to an embodiment. It is a figure which shows an image reading apparatus. It is a figure which shows the hardware constitutions of the control apparatus shown in FIG. It is a figure which shows the light emitting member control circuit which concerns on 1st Embodiment. It is a block diagram which shows the reading program which concerns on 1st Embodiment. It is a graph which shows the relationship between the light quantity of the light emitting member in 1st Embodiment, and the main scanning direction. It is a flowchart which shows the opening / closing detection process which concerns on this embodiment. It is a figure which shows the light emitting member control circuit which concerns on 2nd Embodiment. It is a block diagram which shows the reading program which concerns on 2nd Embodiment. It is a figure which shows the signal which the light emission member lighting signal transmission part which concerns on 2nd Embodiment transmits, (A) is a signal in the case of an image reading process, (B) is a signal in the case of an opening-and-closing detection process. It is. It is a figure which shows the light emitting member control circuit which concerns on 3rd Embodiment. It is a block diagram which shows the reading program which concerns on 3rd Embodiment. It is a graph which shows the relationship between the light quantity of the light emitting member in 3rd Embodiment, and the main scanning direction.

[First Embodiment]
Next, the present embodiment will be described with reference to the drawings.
FIG. 1 shows an outline of an image forming apparatus 10 according to the present embodiment. Further, FIG. 2 shows the image reading apparatus 100.
The image forming apparatus 10 includes an image reading device 100 and an image forming unit 12 that forms an image based on image information read by the image reading device 100.
The image forming unit 12 is of an electrophotographic type, for example, and includes a sheet storage container 16 that stores sheets (recording media) stacked thereon, and the sheet supplied from the sheet storage container 16 to the sheet conveyance path 20. An image is formed on the screen.

  The image forming unit 12 includes an image forming unit main body 14. In the image forming unit main body 14, for example, an image holding member 22 using a photosensitive drum, and a charger 24 that uniformly charges the image holding member 22. An exposure device 26 that forms a latent image on the image carrier 22 uniformly charged by the charger 24; and a developing device 28 that visualizes the latent image on the image carrier 22 formed by the exposure device 26 with toner. A primary transfer device 32 for transferring the toner image formed by the developing device 28 to an intermediate transfer belt 30 used as an intermediate transfer member, and a photoreceptor cleaner 34 for cleaning the toner remaining on the image holding member 22 are mounted. ing.

  Further, in the image forming unit main body 14, a secondary transfer device 38 that transfers the toner image transferred to the intermediate transfer belt 30 to the sheet, a fixing device 40 that fixes the paper transferred to the sheet to the sheet, An intermediate transfer belt cleaner 44 for cleaning the intermediate transfer belt 30 is mounted.

For example, an operation panel 302 used as a user interface is mounted on the front side of the image forming unit main body 14, for example.
On the right side of the image forming unit main body 14, for example, a discharge unit 42 for discharging the sheet on which the image has been formed is mounted.

The exposure device 26 is of, for example, a laser scanning type, and outputs image information of a document read by a photoelectric conversion element 138 (FIG. 2) described later included in the image reading device 100 instead of a laser on / off signal.
The developing device 28 is, for example, a rotary type, and has Y, M, C, and K four color developing devices 36a, 36b, 36c, and 36d, for example, arranged in the periphery, and holds an image when developing each color. It rotates to face the body 22.
The primary transfer device 32 is composed of, for example, a corotron, and the four-color toner images are transferred to the intermediate transfer belt 30 by the primary transfer device 32. The toner image transferred to the intermediate transfer belt 30 is transferred to a sheet by the secondary transfer device 38, this sheet is sent to the fixing device 40, the toner image is fixed to the sheet by the fixing device 40, and the toner image is fixed. The discharged sheet is discharged to the discharge unit 42. The toner remaining on the intermediate transfer belt 30 is scraped off by the intermediate transfer belt cleaner 44.

  The operation panel 302 selects, for example, whether the image forming unit 12 forms a single color image composed of a single black toner or a multicolor image formed of, for example, yellow, magenta, cyan, and black toner, A plurality of operation modes such as setting the magnification and image quality of an image can be selected. The operation panel 302 also sets a document reading area, which is an area when the image reading apparatus 100 reads a document, a plurality of scanning speeds (magnifications) at which the image reading apparatus 100 reads a document, monochrome reading or color reading, It is possible to select a plurality of operation modes such as a conveyance method and setting of document sizes from a plurality of sizes.

  A resist roll 46 is disposed in the sheet conveyance path 20. The registration roll 46 is controlled to temporarily stop the supplied sheet and supply the sheet to the secondary transfer device 38 in synchronization with the timing at which the toner image is formed on the intermediate transfer belt 30.

  The image reading apparatus 100 has a platen member 106 (original plate) made of, for example, glass, which is a material that transmits light and is used as a transmission portion through which the original D is placed. Further, the image reading device 100 is provided with an image reading device main body 104, a platen cover portion 110 (opening / closing member) that is provided in the image reading device main body 104 so as to be openable and closable (indicated by an arrow B in FIG. 2). And a control device 200 (open / close detection unit / open / close detection device) for controlling the operation of the image reading apparatus 100 and a light emitting member control circuit 52 for controlling the light emitting member 50 described later.

The image reading apparatus main body 104 is formed as a casing. In the image reading apparatus main body 104, light is irradiated on the original placed on the platen member 106, and the original is formed based on the reflected light from the original of the irradiated light. An image reading unit 130 (image reading unit) for reading the formed image is mounted.
The image reading unit 130 is movably supported by a guide member (not shown) supported by the image reading apparatus main body 104. When reading the image formed on the document, the image reading unit 130 moves along the guide member in the sub-scanning direction in the image reading apparatus main body 104 as indicated by an arrow A in FIG. Thereby, the image reading unit 130 can read the document while moving in the sub-scanning direction when reading the image of the document placed on the platen member 106.
A document transport device 160 that automatically transports the document D is mounted in the platen cover section 110. The image reading apparatus 100 has a function of flowing and reading the document D being conveyed by the document conveying device 160 and a function of reading the document D placed on the platen member 106.

The image reading unit 130 is provided with a plurality of light emitting members 50 that are light sources, reflecting plates 134a to 134d such as mirrors, an imaging lens 136, and a photoelectric conversion element 138 that is a light receiving element.
A plurality of light emitting members 50 are LED chips that are arranged in the main scanning direction and have light emitting elements such as LEDs (Light Emitting Diodes).

The light emitted from the plurality of light emitting members 50 is applied to the entire main scanning direction of the document placed on the platen member 106.
Further, when a document is not placed on the platen member 106, the light emitted from the plurality of light emitting members 50 is applied to the entire main scanning direction of the platen back 112 provided on the platen cover 110.
The reflected light of the light irradiated on the document (or the platen back 112) is reflected by the reflecting plates 134a to 134d and is incident on the imaging lens 136 to form an image.
The photoelectric conversion element 138 receives the reflected light at the imaging position of the reflected light by the imaging lens 136 and, for example, each RGB light quantity (luminous energy) in units of pixels by a photodiode provided with RGB filters (primary color filters). For example, a three-line color CCD that outputs an analog electrical signal corresponding to a processing circuit (not shown).
The analog electrical signal input to the processing circuit is converted into digital read data by the processing circuit and input to the control device 200.

FIG. 3 is a diagram illustrating a hardware configuration of the control device 200 illustrated in FIG.
As shown in FIG. 3, the control device 200 includes a control unit 210 including a calculation unit 212 such as a CPU and a storage unit 214 such as a memory, a communication device 220, a recording device 222, and a user interface device (UI device). 230.
That is, the control device 20 has a hardware component as a computer capable of information processing and communication with other processing devices or terminals.
The UI device 230 includes an LCD (Liquid Crystal Display) display device or a CRT (Cathode Ray Tube) display device, an output device such as a speaker, a keyboard / touch panel, and the like. The UI device 230 may be integrated with the operation panel 302.

FIG. 4 is a diagram illustrating the light emitting member control circuit 52 according to the first embodiment.
The light emitting member control circuit 52 includes a light emitting member control unit 522, resistors R1 to R3, and a transistor Tr.
The light emitting member control unit 522 controls turning on and off of the light emitting member 50, and further controls the amount of light by turning on the light emitting member 50.
When a high signal (H signal) is input to the enable terminal En, the light emitting member control unit 522 can cause the light emitting member 50 to emit light. That is, when the H signal is not input to the enable terminal En (when the low signal (L signal) is input to the enable terminal En), the light emitting member control unit 522 cannot cause the light emitting member 50 to emit light.

As the voltage input to the voltage setting terminal Vset (the potential of the voltage setting terminal Vset) is higher, the light emitting member control unit 522 causes a larger current to flow through the light emitting member 50.
As the current flowing through the light emitting member 50 increases, the amount of light emitted by the light emitting member 50 increases.
That is, the light emitting member 50 is more effective when the signal input to the voltage setting terminal Vset is a high signal (H signal) than when the signal input to the voltage setting terminal Vset is a low signal (L signal). The amount of light due to the light emission increases.

The control device 200 and the enable terminal En of the light emitting member control unit 522 are connected via a cable CA1.
The control device 200 and the base terminal of the transistor Tr are connected via a cable CA2.
The emitter terminal of the transistor Tr and the voltage setting terminal Vset of the light emitting member control unit 522 are connected via a cable CA3.
Cables CA1 to CA3 may be harnesses or the like.
The potential R is one end of the resistor R1, and the other end is connected to the cable CA3.
One end of the resistor R2 is connected to the collector terminal of the transistor Tr, and the other end is grounded.
One end of the resistor R1 is connected to the cable CA3, and the other end is grounded.

  The H signal is input from the control device 200 to the enable terminal En of the light emitting member control unit 522 via the cable CA1. Accordingly, the light emitting member control unit 522 can cause the light emitting member 50 to emit light.

When the light amount control signal transmitted from the control device 200 to the base terminal of the transistor Tr via the cable CA2 is a low signal (L signal), the voltage input to the voltage setting terminal Vset of the light emitting member control unit 522 is
V1 = V × R3 / (R1 + R3)
It becomes.

On the other hand, when the light amount control signal transmitted from the control device 200 to the base terminal of the transistor Tr via the cable CA2 is a high signal (H signal), the voltage input to the voltage setting terminal Vset of the light emitting member control unit 522 is ,
V2 = V × R2R3 / (R1R2 + R2R3 + R3R1)
It becomes.
In this case, V1> V2 (that is, V1 is an H signal and V2 is an L signal).
That is, the amount of light emitted from the light emitting member 50 is larger when the light amount control signal transmitted from the control device 200 is the L signal than when the light amount control signal transmitted from the control device 200 is the H signal. Become.

FIG. 5 is a block diagram showing the reading program 60 according to the first embodiment.
For example, the reading program 60 is supplied to the control device 200 via a storage medium or the like, stored in the storage unit 214, and installed on the control device 200. This is executed specifically using (the same applies to the following programs).
In this example, the entire functional configuration of the program is installed in the control device 200 as software. However, the present invention is not limited to this. For example, a part of the program may be realized by hardware such as an ASIC. Good.
The program installed in the control device 200 may be recorded on a storage medium such as a CD-ROM and installed in the control device 200 via the storage medium, or distributed in the form of a data signal, and the control device 200 may be installed.

As shown in FIG. 5, the reading program 60 includes an image reading processing control unit 600, a light emitting member processing unit 610 (light emitting member control means), and a reading data processing unit 620 (detection means).
The light emitting member processing unit 610 includes a light emitting member lighting signal transmission unit 612 and a light amount control signal transmission unit 614.
The read data processing unit 620 includes a read data receiving unit 622, an image processing unit 624, a light amount comparison unit 626, a light amount data storage unit 628, and a warning unit 630.

When the user operates the UI device 230 to perform a process of reading an image formed on a document (image reading process), the image reading process control unit 600 performs the light emitting member processing unit 610 and the read data processing. The image reading processing signal for executing the image reading processing is output to the unit 620.
When the image reading process is completed, the image reading process control unit 600 executes a process (open / close detection process) for detecting the opening / closing of the platen cover unit 110 with respect to the light emitting member processing unit 610 and the read data processing unit 620. Open / close detection signal for output.
Furthermore, when the image reading processing control unit 600 outputs an image reading processing signal or an open / close detection signal, the image reading unit 130 is placed at a position where the image can be read (for example, at the end or the center of the platen member 106). Move.

When receiving the image reading processing signal or the open / close detection signal, the light emitting member lighting signal transmission unit 612 transmits a high signal (H signal) to the enable terminal En of the light emitting member control unit 522 via the cable CA1.
When receiving the image reading processing signal, the light amount control signal transmission unit 614 transmits a light amount control signal that is an L signal to the base terminal of the transistor Tr via the cable CA2.
On the other hand, when receiving the open / close detection signal, the light quantity control signal transmission unit 614 transmits a light quantity control signal that is an H signal to the base terminal of the transistor Tr via the cable CA2.
That is, the amount of light emitted by the light emitting member 50 is smaller in the case of the opening / closing detection process than in the case of the image reading process. In other words, the light emitted from the light emitting member 50 is darker in the case of the opening / closing detection process than in the case of the image reading process.

The read data receiving unit 622 receives the read data received by the photoelectric conversion element 138 and converted into a digital signal.
In addition, when receiving an image reading processing signal from the image reading processing control unit 600, the reading data receiving unit 622 outputs the received reading data to the image processing unit 624.
On the other hand, when the reading data receiving unit 622 receives an open / close detection signal from the image reading processing control unit 600, the reading data receiving unit 622 outputs the received reading data to the light amount comparison unit 626.

The image processing unit 624 performs image processing on the read data, generates image data, transmits the generated image data to the image forming unit 12, and performs processing for forming an image on a recording medium.
Note that the image processing unit 624 may simply store the image data, or may perform processing for transmitting the image data by facsimile.
The light amount comparison unit 626 calculates the light amount (read light amount data) in the main scanning direction from the received read data, and compares the calculated read light amount data with the reference light amount data stored in the light amount data storage unit 628.

FIG. 6 is a graph showing the relationship between the light amount of the light emitting member 50 and the main scanning direction in the first embodiment.
The broken line in FIG. 6 shows the case where the platen cover 110 is closed and when the input of the voltage setting terminal Vset is an L signal (= V2), the light emitting member 50 emits light and is reflected by the platen cover 110 and read. The obtained light quantity data is shown.
The light amount data storage unit 628 stores the light amount data in advance as reference light amount data in association with the main scanning direction.
When the platen cover 110 is open, the read light amount data is smaller than the reference light amount data, as shown by the solid line in FIG.
This is because, when the platen cover part 110 is open, the light emitted from the light emitting member 50 is not reflected on the platen cover part 110, so that the reflected light is not read by the photoelectric conversion element 138 (or even if reflected, the photoelectric conversion element). This is because the amount of light read by 138 becomes smaller.

The light amount comparing unit 626 outputs a signal to the warning unit 630 when the difference between the reference light amount data and the read light amount data is larger than a predetermined threshold value.
On the other hand, the light amount comparison unit 626 controls the light emitting member processing unit 610 so that the light emitting member 50 is turned off when the difference between the reference light amount data and the read light amount data is equal to or less than a predetermined threshold value.
At this time, the light emitting member lighting signal transmission unit 612 of the light emitting member processing unit 610 transmits a low signal (L signal) to the enable terminal En of the light emitting member control unit 522 via the cable CA1.
The difference between the reference light amount data and the read light amount data may be a comparison of values obtained by integrating the reference light amount data and the read light amount data in the main scanning direction, or the peaks of the reference light amount data and the read light amount data. Values may be compared, or reference light amount data and read light amount data corresponding to one or more predetermined positions (for example, an end portion and a central portion) in the main scanning direction may be compared.

The warning unit 630 controls the UI device 230 to notify the user that the platen cover unit 110 is open.
For example, the warning unit 630 may issue a buzzer or turn on a lamp.
The image reading processing control unit 600 outputs an opening / closing detection signal to the light emitting member processing unit 610 and the read data processing unit 620 when a predetermined period has elapsed after the above-described opening / closing detection processing is completed. Also good.

For example, when the opening / closing detection process is terminated by a warning issued by the warning unit 630, the platen cover unit 110 is open. Therefore, when a relatively short period T1 (for example, 10 minutes) has elapsed, the image reading process is performed. The control unit 600 may output an open / close detection signal to the light emitting member processing unit 610 and the read data processing unit 620.
On the other hand, when the opening / closing detection process is ended by the light emitting member 50 being turned off by the light quantity comparison unit 626, the platen cover unit 110 is closed, so when a relatively long period T2 (for example, 1 hour) has elapsed, The image reading processing control unit 600 may output an open / close detection signal to the light emitting member processing unit 610 and the read data processing unit 620.
In this case, T2> T1.

FIG. 7 is a flowchart (S10) showing the open / close detection process according to the present embodiment.
Note that the order of the steps shown below may be changed as appropriate, and not all the steps are necessary.

In step 102 (S102), the image reading process control unit 600 detects that the image reading process has ended, and outputs an open / close detection signal.
In step 104 (S104), the image reading unit 130 moves to a position where the image can be read under the control of the image reading processing control unit 600.
In step 106 (S106), the light emitting member processing unit 610 turns on the light emitting member 50 so that the amount of light is smaller than that in the image reading process.

In step 108 (S108), the read data receiving unit 622 receives the read data received by the photoelectric conversion element 138 and converted into a digital signal.
In step 110 (S110), the light amount comparison unit 626 determines whether or not the platen cover unit 110 is closed from the received read data. If the platen cover unit 110 is closed, the process proceeds to S116. Advances to S112.
In step 112 (S112), the warning unit 630 controls the UI device 230 to notify the user of a warning indicating that the platen cover unit 110 is open.
In step 114 (S114), the image reading process control unit 600 determines whether or not the period T1 has elapsed. If the period T1 has elapsed, the process returns to S108, and if the period T1 has not elapsed, S114 repeat.

In step 116 (S116), the light emitting member 50 is turned off by the processing of the light emitting member processing unit 610.
In step 118 (S118), the image reading process control unit 600 determines whether or not the period T2 has elapsed. If the period T2 has elapsed, the process returns to S104, and if the period T2 has not elapsed, the process is performed. Advances to S120.
In step 120 (S120), the image reading process control unit 600 determines whether or not the image reading process has been started. If started, the process ends. If not, the process returns to S118. .

[Second Embodiment]
Next, a second embodiment will be described.
FIG. 8 is a diagram showing a light emitting member control circuit 54 according to the second embodiment.
The light emitting member control circuit 54 includes a light emitting member control unit 522.
The control device 200 and the enable terminal En of the light emitting member controller 522 are connected via a cable CA4.
The control device 200 and the voltage setting terminal Vset of the light emitting member control unit 522 are connected via a cable CA5.

The H signal is input from the control device 200 to the enable terminal En of the light emitting member control unit 522 via the cable CA4. Accordingly, the light emitting member control unit 522 can cause the light emitting member 50 to emit light.
A light amount control signal (voltage value) that is a high signal (H signal) is input from the control device 200 to the voltage setting terminal Vset of the light emitting member control unit 522 via the cable CA5.
When a light amount control signal that is an H signal is input to the voltage setting terminal Vset, the light emitting member control unit 522 supplies a current to the light emitting member 50 to emit light having a light amount necessary for the image reading process.
As a result, the light emitting member 50 emits a light amount of light necessary for the image reading process.

FIG. 9 is a block diagram showing a reading program 64 according to the second embodiment.
The reading program 64 has a configuration in which the light emitting member processing unit 610 of the reading program 60 shown in FIG.
The light emitting member processing unit 640 (light emitting member control means) includes a light emitting member lighting signal transmission unit 642 and a light amount control signal transmission unit 644.

When the light emitting member lighting signal transmission unit 642 receives the image reading processing signal or the open / close detection signal from the image reading processing control unit 600, the H signal is sent to the enable terminal En of the light emitting member control unit 522 via the cable CA4. Send.
When receiving the image reading processing signal or the open / close detection signal from the image reading processing control unit 600, the light amount control signal transmitting unit 644 sends a light amount control signal that is an H signal to the voltage setting of the light emitting member control unit 522 via the cable CA5. Transmit to terminal Vset.

Here, when receiving the image reading processing signal, the light emitting member lighting signal transmitter 642 transmits an H signal for a period t1, as shown in FIG.
On the other hand, when receiving the open / close detection signal, the light emitting member lighting signal transmitter 642 transmits an H signal during a period t2 (t1> t2) as shown in FIG.
Thus, since the lighting time of the light emitting member 50 is shorter in the case of the opening / closing detection process than in the case of the image reading process, the case of the opening / closing detection process is the same as that of the image reading process as in the first embodiment. The amount of light emitted by the light emitting member 50 is smaller than the case.

[Third Embodiment]
Next, a third embodiment will be described.
FIG. 11 is a diagram illustrating a light emitting member control circuit 56 according to the third embodiment.
The light emitting member control circuit 56 includes light emitting member control units 522a and 522b. The configuration of the light emitting member control units 522a and 522b is substantially the same as the configuration of the light emitting member control unit 522.

The light emitting member control unit 522a controls the turning on and off of the light emitting member 50a (light emitting member A), and further controls the amount of light by turning on the light emitting member 50a.
The light emitting member control unit 522b controls turning on and off of the light emitting member 50b (light emitting member B), and further controls the amount of light by turning on the light emitting member 50b.
The light emitting members 50a and 50b constitute a plurality of light emitting members 50 arranged in the main scanning direction, and the light emitting members 50a are, for example, the light emitting members 50 provided at positions corresponding to the vicinity of both ends in the main scanning direction. The light emitting member 50b is, for example, the light emitting member 50 provided at a position corresponding to the vicinity of the central portion in the main scanning direction.

The control device 200 and the enable terminals En of the light emitting member controllers 522a and 522b are connected via cables CA11 and CA21, respectively.
The control device 200 and the voltage setting terminals Vset of the light emitting member controllers 522a and 522b are connected via cables CA12 and CA22, respectively.
The H signal is input from the control device 200 to the enable terminals En of the light emitting member controllers 522a and 522b via the cables CA11 and CA21, respectively. Accordingly, the light emitting member control units 522a and 522b can cause the light emitting members 50a and 50b to emit light, respectively.

A light amount control signal (voltage value), which is a high signal (H signal), is input from the control device 200 to the voltage setting terminals Vset of the light emitting member control units 522a and 522b via the cables CA12 and CA22.
When the light intensity control signal (voltage value) that is an H signal is input to the voltage setting terminal Vset, the light emitting member controllers 522a and 522b have the light intensity necessary for the image reading process to the light emitting members 50a and 50b, respectively. An electric current for emitting light is supplied.
As a result, the light emitting members 50a and 50b emit light having a light amount necessary for the image reading process.
In this embodiment, one light emitting member 50a is provided near both ends in the main scanning direction (two in total), and one light emitting member 50b is provided near the center in the main scanning direction (one in total). However, any number of the light emitting members 50a and 50b may be provided.

FIG. 12 is a block diagram showing a reading program 66 according to the third embodiment.
The reading program 66 has a configuration in which the light emitting member processing unit 610 of the reading program 60 shown in FIG.
The light emitting member processing unit 660 (light emitting member control means) includes light emitting member lighting signal transmitters 662a and 662b and a light amount control signal transmitter 664.

When receiving the image reading processing signal from the image reading processing control unit 600, the light emitting member lighting signal transmitting unit 662a transmits the H signal to the enable terminal En of the light emitting member control unit 522a via the cable CA11.
Similarly, when receiving the image reading processing signal from the image reading processing control unit 600, the light emitting member lighting signal transmitting unit 662b transmits an H signal to the enable terminal En of the light emitting member control unit 522b via the cable CA21. To do.

When receiving the opening / closing detection signal from the image reading processing control unit 600, the light emitting member lighting signal transmission unit 662a transmits the H signal to the enable terminal En of the light emitting member control unit 522a via the cable CA11.
On the other hand, when receiving the opening / closing detection signal from the image reading processing control unit 600, the light emitting member lighting signal transmission unit 662b transmits an L signal to the enable terminal En of the light emitting member control unit 522b via the cable CA21.

By the processing of the light emitting member lighting signal transmitters 662a and 662b described above, all the light emitting members 50 are turned on in the image reading process, but only the light emitting members 50a at both ends are turned on in the open / close detection process.
When receiving the image reading processing signal or the open / close detection signal from the image reading processing control unit 600, the light amount control signal transmitting unit 664 receives the light amount control signal as the H signal via the cables CA12 and CA22, respectively. The data is transmitted to the voltage setting terminal Vset of 522a and 522b.
The light amount control signal transmitter 664 may be provided separately in association with each of the light emitting member controllers 522a and 522b. In this case, the light quantity control signal transmission unit 664 corresponding to the light emitting member control unit 522b may transmit the L signal or the H signal in the case of the open / close detection process.

FIG. 13 is a graph showing the relationship between the light amount of the light emitting member 50 and the main scanning direction in the third embodiment.
The broken line in FIG. 13 is data of the amount of light read when the platen cover 110 is closed and read by the light emitting member 50a emitting light and reflecting off the platen cover 110.
The light amount data storage unit 628 stores the light amount data in advance as reference light amount data in association with the main scanning direction.
When the platen cover 110 is open, the read light amount data is smaller than the reference light amount data, as indicated by the solid line in FIG.
In the third embodiment, since only a part of the light emitting members 50 emit light in the case of the open / close detection process, the light amount data shown in FIG. 13 is different from the light amount data shown in FIG. The amount of light is small, and the amount of light is large near both ends in the main scanning direction.

In the above-described embodiment, the configuration has been described separately for each of the first embodiment, the second embodiment, and the third embodiment. However, the first embodiment, the second embodiment, and the third embodiment have been described separately. The configurations of the embodiments can be appropriately combined with each other.
That is, the voltage value input to the voltage setting terminal Vset of the light emitting member control unit 522 (FIG. 4) in the case of the open / close detection process by combining the first embodiment and the second embodiment is used as the image reading process. The H signal may be input to the enable terminal En during the period t2 (FIG. 10).

In addition, in the case of the opening / closing detection process by combining the first embodiment and the third embodiment, the voltage value input to the voltage setting terminal Vset of the light emitting member control unit 522a (FIG. 11) is converted into the image reading process. It may be smaller than the case.
In addition, in the case of the opening / closing detection process by combining the first embodiment and the third embodiment, an H signal is input to the enable terminal En of the light emitting member control unit 522b (FIG. 11), and the light emitting member control is performed. By making the voltage value input to the voltage setting terminal Vset of the unit 522b smaller than that in the case of the image reading process, the light emitting member 50a emits light in the same way as in the case of the image reading process in the case of the open / close detection process. The member 50b may emit light so as to be darker than in the case of the image reading process.

DESCRIPTION OF SYMBOLS 10 Image forming apparatus 100 Image reading apparatus 106 Platen member 104 Image reading apparatus main body 110 Platen cover part 130 Image reading unit 200 Control apparatus 50 Light emitting member 52,54,56 Light emitting member control circuit 522 Light emitting member control part 60,64,66 Reading Program 600 Image reading processing control unit 610, 640, 660 Light emitting member processing unit 612, 642, 662 Light emitting member lighting signal transmitting unit 614, 644, 664 Light amount control signal transmitting unit 620 Reading data processing unit 622 Reading data receiving unit 624 Image processing Section 626 Light intensity comparison section 628 Light intensity data storage section 630 Warning section

Claims (7)

An image reading unit for reading an image formed on a document;
A document table on which a document on which an image is read by the image reading unit is placed;
A light emitting member for irradiating light on a document placed on the document table;
An opening and closing member that covers the document table so as to be freely opened and closed;
An open / close detection unit that performs processing for detecting opening / closing of the open / close member,
The open / close detector is
A light emitting member control means for controlling the light emitting member to turn on when the image reading unit is not reading an image;
An image reading apparatus comprising: a detection unit configured to detect opening / closing of the opening / closing member based on a reading value obtained by the image reading unit when the light emitting member is controlled to be turned on by the light emitting member control unit. The light emitting member control means controls the light emitting member to light up so that the amount of light is smaller than when the image reading unit reads an image when the image reading unit is not reading a document. The image reading apparatus described in 1. The open / close detector is
The image reading apparatus according to claim 1, further comprising: a warning unit that notifies a warning indicating that the opening / closing member is open when the detection unit detects that the opening / closing member is open. The said opening / closing detection part performs the process for detecting the opening / closing of the said opening / closing member again after 1st period progress, when it detects that the said opening / closing member is opened by the said detection means. The image reading apparatus described. The opening / closing detection unit detects the opening / closing of the opening / closing member again after the elapse of a second period longer than the first period when the opening / closing detection unit detects that the opening / closing member is closed. The image reading apparatus according to claim 4, wherein the processing is performed. A light emitting member that emits light to a document placed on a document table on which a document on which an image is read by the image reading unit is read when the image reading unit that reads an image formed on the document does not read the image. A light emitting member control means for controlling to light up;
When the light emitting member control means controls the light emitting member to be lit, the opening and closing comprises: a detecting means for detecting opening and closing of the opening and closing member that opens and closes the document table based on a reading value by the image reading unit. Detection device. A light emitting member that emits light to a document placed on a document table on which a document on which an image is read by the image reading unit is read when the image reading unit that reads an image formed on the document does not read the image. A light emitting member control step for controlling to light up;
In the light emitting member control step, when the light emitting member is controlled to be lit, a detection step of detecting opening / closing of an opening / closing member that covers the document table so as to be openable / closable based on a reading value by the image reading unit is provided to the computer. The program to be executed.

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