JP5514773B2 - Display input device and image forming apparatus having the same - Google Patents

Description

  The present invention relates to a display input device having a display unit, a touch panel, and the like. The present invention also relates to an image forming apparatus such as a copying machine, a multifunction machine, a printer, and a FAX apparatus provided with the display input device.

  For example, the user inputs various settings to a display input device (for example, an operation panel) of the image forming apparatus so that the job is executed with desired settings. The display input device may be provided with a touch panel. A display input device including a touch panel displays a setting screen, recognizes a key or button pressed by a user's touch using the touch panel, and receives an input. Here, the user may accidentally press a key. If erroneous input can be prevented, it is possible to avoid the trouble of canceling the setting or starting over. Therefore, Patent Document 1 discloses an invention for an erroneous input by a user.

  Specifically, Patent Document 1 includes key input means, detection means for detecting key input from the key input means, and a buffer for storing key input information obtained by the detection means, and within a certain period. When one or more key inputs are detected by the detection means, the key input information is stored in the buffer, and only the key input information stored last in the buffer is valid among the key input information input within a certain period. Is described. With this configuration, even when a key is accidentally pressed, an operation as intended by the user is realized by inputting a desired key within a certain period of time, and attempts to prevent malfunction due to an erroneous operation by the user (Patent Document 1). : Claim 1, paragraph [0009] etc.).

JP 2009-021043 A

  The user learns the layout of the keys and the contents of the screen while using them and becomes familiar with the operation of the display input device. When the user becomes familiar with the operation, the user may predict the displayed keys and contents from past experience and input them quickly (press the keys one after another).

  However, as a result of familiarity, the user presses the key without confirming the contents and keys of the screen newly displayed by switching, or presses the key as soon as the screen is switched. For this reason, an incorrect key may be pressed by a quick press due to familiarity. If an incorrect key is pressed, processing unintended by the user is performed, and it may be necessary to redo the setting.

  For example, when an incorrect setting value is selected from a plurality of setting values (the key of the incorrect setting value is quickly pressed), the correct setting value may be selected again. However, a key that cancels a complicated setting by mistake (such as a cancel key) may be pressed by mistake due to early pressing. In addition, when the key is accidentally pressed, the screen is largely switched, and one or more screens may have to be changed in order to return to the original screen. Therefore, there is a problem that it should not accept erroneous input (wrong key press) caused by familiarity, which takes time to redo the setting.

  Here, it is considered that the electronic device described in Patent Document 1 has a function of preventing erroneous input for an operation in which a key is continuously pressed a plurality of times due to a hand tremor or the like. However, in the invention described in Patent Document 1, if an incorrect input is performed by pressing a key without confirming the contents of the displayed screen and the key well by familiarity, among a series of keys pressed one after another, There is a case where the last key inputted as an erroneous input is accepted and the input is accepted. As a result, processing unintended by the user is performed, and it may be necessary to redo the settings that require time. Therefore, the invention described in Patent Document 1 cannot solve the above problem.

  In view of the above-described problems, the present invention delays the acceptance of a specific input among the erroneous inputs caused by the quick press due to the familiarity, accepts only an accurate input while suppressing a decrease in operation efficiency, and is troublesome. It is an object to prevent re-setting and improve the usability of the display input device.

In order to solve the above problem, a display input device according to claim 1 is a display unit that displays a plurality of keys for selecting a setting item and setting a setting value in the selected setting item on the screen; A touch panel unit for detecting the position pressed by the unit, and receiving the input by recognizing the pressed key among the keys displayed on the display unit based on the output of the touch panel unit. A display control unit that controls display and switches the display to the display unit according to the pressed key, and the display control unit measures a time interval at which the key is pressed and is set in advance. When the key is pressed at short the time intervals than the reference time, receiving the input of the key input prevention mode erroneously delaying accepting input of the specific key is a specific predetermined key, the key When the specific key is positioned at a position overlapping the position of the key pressed on the screen before switching on the screen after switching to be displayed on the display unit by being pressed, in the erroneous input prevention mode, The position of the specific key on the screen after switching is moved to a position that does not overlap and displayed on the display unit .

According to this configuration, the display control unit measures the time interval at which the key is pressed, and accepts input of a predetermined specific key when the key is pressed at a time interval shorter than a predetermined reference time. Accepts key input in delayed input prevention mode. As a result, when the key is pressed for a short time interval and there is a possibility that the key is pressed without confirming the displayed screen contents or key, it is short after accidentally pressing the previous key due to familiarity Even if the specific key is pressed at time intervals, the input is not accepted immediately. In other words, the time required until the input of a specific key is accepted is intentionally reduced, and confirmation of the content of the displayed screen and the key is prompted. Therefore, processing unintended by the user is performed, setting re-execution can be prevented, and usability of the display input device can be improved. In addition, according to this configuration, the display control unit has the specific key on the screen after switching to be displayed on the display unit when the key is pressed at a position overlapping the position of the key pressed on the screen before switching. In the erroneous input prevention mode, the position of the specific key on the screen after switching is moved to a position that does not overlap and displayed on the display unit. Thus, normally, a key displayed at the same position is pressed, but it is necessary to move the position of the finger in the erroneous input prevention mode. Since the finger movement takes a certain time, it is possible to provide time for recognizing whether or not the key to be pressed is the correct key. Further, it is possible to make it difficult to generate an erroneous key input by pressing twice at the same position or a close position due to familiarity.

  Also, acceptance of input is delayed only for a specific key that is a predetermined specific key. Thereby, reception of input of all the keys displayed on the display unit is not delayed. Therefore, even in the erroneous input prevention mode, the delay in setting input does not reach the entire input operation, and it is difficult to prevent quick setting input. Further, the erroneous input prevention mode is set only when the key is pressed at a time interval shorter than a predetermined reference time, and the erroneous input prevention mode is not always set. Therefore, it is difficult to cause a delay in setting input.

  The “reference time” is a time that can be arbitrarily determined in consideration of the screen size of the display unit, the average distance between keys, and the like. For example, the “reference time” may be determined based on an average key of a user who has become accustomed to the operation by an experiment or the like and an interval of pressing the key.

  According to a second aspect of the present invention, in the display input device according to the first aspect, the display control unit causes the display unit to display a cancel key for accepting cancellation of a setting that has already been made. The specific key is used.

  When a cancel key for canceling a setting that has already been made is pressed, processing for discarding the setting contents is performed, and the setting needs to be redone. Repeating the previously performed operation is complicated. In addition, the more complicated the operations performed earlier, the more time is required to redo the settings. Therefore, according to this configuration, the cancel key is a specific key. Thereby, it is possible to prevent an erroneous input of the cancel key due to familiarity from being accepted. Therefore, it is possible to prevent time-consuming settings from being redone, and to improve the usability of the display input device.

  According to a third aspect of the invention, in the first or second aspect of the invention, the display control unit displays a confirmation key for accepting confirmation of setting on the display unit, and the confirmation key is the specific key. It was decided that.

  When the confirmation key for confirming the setting is pressed, setting of the setting item is completed and the screen display may be switched greatly. However, if there is an error in the setting of the confirmed setting item, it is necessary to select the setting item and redo the setting value setting, which may be a complicated operation for the user. Therefore, according to this configuration, the confirmation key is a specific key. As a result, it is possible to prevent acceptance of a confirmation key that is erroneously pressed due to familiarity. Therefore, it is possible to prevent time-consuming settings from being redone, and to improve the usability of the display input device.

In the erroneous input prevention mode, the display control unit accepts an input by the specific key when a predetermined input ignorance time has elapsed since the previous key was pressed, and the input ignorance time has elapsed. It may be ignored even if the specific key is pressed in the meantime .

  According to this configuration, in the erroneous input prevention mode, the display control unit accepts input by the specific key when a predetermined input ignoring time has elapsed since the previous key was pressed, and the input ignoring time elapses. Even if a specific key is pressed during this period, it is ignored. Thereby, even if an erroneous specific key is pressed due to familiarity, an input is not immediately accepted. In addition, the user can be made to confirm what the screen contents and the key to be pressed are, and the user can press the correct key after the input ignoring time has elapsed, thereby preventing erroneous input.

  The “input ignorance time” is an arbitrarily determined time. For example, it is a time for the user to sufficiently confirm the contents of the key to be pressed, and can be set longer than a reference time for determining whether or not the key is quickly pressed due to familiarity.

The display control unit may receive an input from the specific key when the specific key is pressed a plurality of times in the erroneous input prevention mode .

  According to this configuration, when the specific key is pressed a plurality of times in the erroneous input prevention mode, the display control unit accepts input by the specific key. Thereby, even if an erroneous specific key is pressed due to familiarity, an input is not immediately accepted. Also, the user can confirm the screen contents and the key to be pressed while pressing the key a plurality of times. Then, it is possible to prevent erroneous input by determining whether the correct key is pressed.

In addition, when the specific key is pressed in the erroneous input prevention mode, the display control unit displays a confirmation screen for confirming that the specific key is pressed on the display unit, and the confirmation screen The input of the specific key may be accepted when the continuation input indicating that the process may be proceeded is performed, and the input of the specific key may be ignored when the stop input indicating that the process is not proceeded is performed.

  According to this configuration, when the specific key is pressed in the erroneous input prevention mode, the display control unit displays a confirmation screen for confirming that the specific key is pressed on the display unit, and performs processing on the confirmation screen. If a continuation input indicating that the processing can be continued is made, the input of the specific key is accepted, and if a stop input indicating that the processing cannot be advanced is made, the input of the specific key is ignored. Thereby, even if an erroneous specific key is pressed due to familiarity, the user is surely confirmed whether or not the input key (pressed key) is correct. Therefore, processing not intended by the user based on erroneous input is not performed.

The display control unit may accept an input by the specific key when the specific key is kept pressed for a predetermined long press time in the erroneous input prevention mode .

  According to this configuration, in the erroneous input prevention mode, the display control unit accepts an input from the specific key if the specific key is continuously pressed for a predetermined long pressing time. Thereby, even if an erroneous specific key is pressed due to familiarity, an input is not immediately accepted. In addition, while the user is pressing the key, the user can notice whether the screen content or the key being pressed is the correct key. Accordingly, erroneous input can be prevented.

According to a fourth aspect of the present invention, in the first to third aspects of the invention, after the display control unit enters the erroneous input prevention mode, the next key is pressed after the previous key is pressed. When the interval until the time is equal to or longer than the reference time, the erroneous input prevention mode is canceled.

  According to this configuration, the display control unit cancels the erroneous input prevention mode when the interval from when the previous key is pressed to when the next key is pressed exceeds the reference time after entering the erroneous input prevention mode. To do. Thereby, when it is recognized that the user is selecting and inputting (pressing) the key while confirming the contents of the key, the erroneous input prevention mode is canceled. Therefore, when it is recognized that erroneous input due to familiarity is unlikely to occur, the input is accepted without delay, and the usability of the display input device can be improved.

According to a fifth aspect of the present invention, an image forming apparatus includes the display input device according to any one of the first to fourth aspects.

  According to this configuration, since any one of the display input devices described above is included, an easy-to-use image forming apparatus can be provided.

  As described above, according to the present invention, the reception of a specific input is delayed among the erroneous inputs due to the quick press caused by the familiarity. As a result, only accurate input is accepted, and processing that is not intended by the user is avoided. Then, a certain amount of prompt reception of input is ensured to suppress a decrease in operation efficiency. Further, it is possible to prevent the troublesome setting from being performed again and improve the usability of the display input device.

1 is a schematic front cross-sectional view illustrating an example of a multifunction machine. It is a top view which shows an example of an operation panel. 2 is a block diagram illustrating an example of a hardware configuration of a multifunction peripheral. FIG. It is explanatory drawing which shows an example of the box initial screen for utilizing a box function. FIG. 10 is an explanatory diagram illustrating an example of a selection screen for selecting setting items for reading a document. FIG. 6 is an explanatory diagram illustrating an example of a setting screen for setting a setting value of a setting item for document size. It is explanatory drawing which shows an example of the incorrect input prevention mode setting screen which sets reception of the key input of incorrect input prevention mode. It is explanatory drawing which shows an example of a confirmation screen. It is explanatory drawing which shows an example of a movement of a specific key. (A), (b) is explanatory drawing for demonstrating an example of the transition of incorrect input prevention mode and normal mode. It is a flowchart which shows an example of the flow of key input reception by an operation panel.

  An embodiment of the present invention will be described with reference to FIGS. Here, the present invention can be applied to various display input devices, but an operation panel 1 (corresponding to a display input device) of a multifunction peripheral 100 (corresponding to an image forming apparatus) will be described as an example. However, each element such as configuration and arrangement described in this embodiment does not limit the scope of the invention and is merely an illustrative example.

(Schematic configuration of MFP 100)
First, an outline of the main body of the multifunction peripheral 100 according to the embodiment will be described with reference to FIG. FIG. 1 is a schematic front cross-sectional view illustrating an example of the multifunction peripheral 100.

  The multifunction peripheral 100 according to the present embodiment is provided with a document conveying device 2b, an image reading unit 2a, an operation panel 1, and the like at the top. The document conveying device 2b continuously conveys the documents stacked on the document placing tray 21 one by one toward the reading position (feed reading contact glass 22) of the image reading unit 2a. Further, the document conveying device 2b can be opened and closed by swinging the front side by a fulcrum (not shown) provided on the back side of the sheet of FIG. For example, an original such as a book can be placed on the placement reading contact glass 23 and the original can be suppressed by closing the original conveying device 2b.

  The image reading unit 2a reads a document and generates image data. Then, contact glass (feed reading contact glass 22 and placement reading contact glass 23) is provided on the upper surface of the image reading unit 2a. In the image reading unit 2a, there are optical system members such as a moving frame (including an exposure lamp and a mirror) that moves in the horizontal direction (left and right in the case of FIG. 1), a lens, and an image sensor (for example, CCD). (Both not shown) are provided. For example, when a document conveyed continuously by the document conveying device 2b is read, a moving frame is fixed below the feed reading contact glass 22, and reflected light of the document is guided to a lens and an image sensor. When reading a document placed on the placement reading contact glass 23, the moving frame is moved in the horizontal direction to guide the reflected light of the document to the lens and the image sensor.

  The image reading unit 2a uses these optical system members to irradiate the original with light, A / D converts the output value of each pixel of the image sensor that receives the reflected light of the original, and generates image data. The multi-function device 100 can print based on the read image data (copy function).

  Further, as indicated by a broken line in FIG. 1, the operation panel 1 is provided on the front side of the image reading unit 2 a (above the front of the multifunction device 100). Details of the operation panel 1 will be described later.

  In addition, a sheet feeding unit 3a, a conveyance path 3b, an image forming unit 4a, a fixing unit 4b, and the like are provided inside the multifunction peripheral 100 main body.

  The paper feed unit 3a stores and supplies paper used for printing. The paper feed unit 3a includes a total of two cassettes 31 (31a, 31b) that can be inserted and removed in the vertical direction. Each cassette 31 has a plurality of sheets (for example, about 500 to 1000 sheets) of various types (for example, plain paper, copy paper, recycled paper, etc.) and each size (for example, A4, A3, B4, B5, letter size, etc.). Load and house. Each cassette 31 (31a, 31b) is provided with a paper feed roller 32. At the time of printing, one of the paper feed rollers 32 is rotationally driven to supply the paper.

  The transport path 3b is a path for transporting paper within the apparatus. In the conveyance path 3b, a conveyance roller pair 33 that is rotationally driven during conveyance of the sheet, a registration roller pair 34 that waits for the conveyed sheet in front of the image forming unit 4a, and sends out the toner image formation timing, and fixing. A pair of discharge rollers 36 for discharging the used paper toward the discharge tray 35 is provided.

  The image forming unit 4a forms an image (toner image) on the paper supplied from the paper supply unit 3a based on the image data, and transfers the toner image onto the conveyed paper. As the image data, document image data acquired by the image reading unit 2a and image data transmitted from the computer 200 (see FIG. 3) connected to the multifunction peripheral 100 are used. The image forming unit 4a includes a photosensitive drum 41 supported so as to be rotatable in the direction of the arrow shown in FIG. 1, a charging device 42, an exposure device 43, a developing device 44, and a transfer roller disposed around the photosensitive drum 41. 45, a cleaning device 46, and the like.

  A photosensitive drum 41 that is rotationally driven in a predetermined direction is provided at substantially the center of the image forming unit 4a. The charging device 42 charges the photosensitive drum 41 to a predetermined potential. The exposure device 43 outputs laser light based on the image data, scans and exposes the surface of the photosensitive drum 41, and forms an electrostatic latent image according to the image data. The developing device 44 supplies toner to the electrostatic latent image formed on the photosensitive drum 41 and develops it. The transfer roller 45 is in pressure contact with the photosensitive drum 41 to form a nip. Then, the registration roller pair 34 makes a timing and causes the sheet to enter the nip. When the sheet and the toner image enter the nip, a predetermined voltage is applied to the transfer roller 45. As a result, the toner image on the photosensitive drum 41 is transferred to the sheet. The cleaning device 46 removes the toner remaining on the photosensitive drum 41 after the transfer.

  The fixing unit 4b fixes the toner image transferred to the paper. The fixing unit 4b of the present embodiment includes a heating roller 47 and a pressure roller 48 that incorporate a heating element. The heating roller 47 and the pressure roller 48 are pressed to form a nip. Then, as the sheet passes through the nip, the toner is melted and heated, and the toner image is fixed on the sheet. The sheet that has passed through the fixing unit 4b is sent to the discharge tray 35 and discharged.

(Operation panel 1)
Next, an example of the operation panel 1 according to the embodiment will be described with reference to FIG. FIG. 2 is a plan view showing an example of the operation panel 1.

  The operation panel 1 functions as an input unit for performing settings such as printing such as copying, document reading, and image data transmission. Then, as shown in FIG. 1, it is provided above the front surface of the multifunction peripheral 100. The operation panel 1 includes a liquid crystal display unit 5 (corresponding to a display unit).

  The liquid crystal display unit 5 displays one or a plurality of keys for performing function selection, setting, character input, and the like. The user can perform settings relating to printing, reading, transmission of image data, and printing based on image data stored in the multifunction peripheral 100 by pressing a setting screen 93 or a key displayed on the liquid crystal display unit 5. it can.

  In addition, a touch panel unit 6 (for example, a resistive film type) is provided on the upper surface of the liquid crystal display unit 5. The touch panel unit 6 is for detecting the position and coordinates of the portion pressed by the liquid crystal display unit 5. In addition, as the touch panel part 6, those of each system such as a resistive film system, a surface acoustic wave system, an infrared system, a capacitance system, etc. can be adopted and there is no particular limitation.

  The operation panel 1 is provided with the following hardware keys (buttons). For example, a numeric keypad 11 for inputting numbers, a start key 12 for instructing to start processing such as copying after various settings, and the like are provided. Also, a copy key 13 that is pressed when using the copy function, a transmission key 14 that is pressed when using the scanner function, and the FAX function are provided. In addition, a box key 15 that is pressed when using a box function (a function related to use of image data stored in the multifunction device 100 or storage of image data in the multifunction device 100) is also provided. As described above, the operation panel 1 includes the box key 15 and various hard keys, and functions as an input unit that performs various settings, mode selections, and the like for each function of the multifunction peripheral 100.

(Hardware configuration of MFP 100)
Next, the hardware configuration of the multifunction peripheral 100 according to the embodiment will be described with reference to FIG. FIG. 3 is a block diagram illustrating an example of a hardware configuration of the multifunction peripheral 100.

  A main control unit 7 is provided in the multifunction peripheral 100. The main control unit 7 controls, for example, the operation panel 1, the image reading unit 2a, the document conveying device 2b, the paper feeding unit 3a, the conveying path 3b, the image forming unit 4a, the fixing unit 4b, and the like.

  The main control unit 7 includes, for example, an element that performs processing and calculation such as the CPU 71. The CPU 71 is stored in the storage unit 72 and performs calculations based on the developed control program to control each unit of the multifunction peripheral 100. The main control unit 7 is for each function such as a main control unit that performs overall control and image processing, an engine control unit that controls printing by performing ON / OFF of a motor that rotates an image forming and various rotating bodies, and the like. It may be divided into In this description, a configuration in which control units that can be divided are combined as the main control unit 7 will be described and described.

  The storage unit 72 is communicably connected to the main control unit 7. The storage unit 72 is configured by combining nonvolatile and volatile storage devices such as ROM, RAM, and HDD. The storage unit 72 can store various data such as a control program, control data, setting data, and image data of the multifunction peripheral 100.

  The main control unit 7 is communicably connected to a communication unit 73 (communication interface) including various connectors, sockets, a FAX modem, and the like. The communication unit 73 is connected to a plurality of external computers 200 (for example, personal computers and servers) and a counterpart FAX apparatus 300 (only one is shown for convenience in FIG. 7) via a network, a public line, or the like. For example, the image data obtained by reading the document in the image reading unit 2a can be transmitted to the external computer 200 or the partner FAX apparatus 300 (scanner function, FAX function). It is also possible to perform printing, FAX transmission, etc. based on image data transmitted from the external computer 200 or the partner FAX apparatus 300 and input to the MFP 100 (printer function, FAX function).

  In addition, for example, the main control unit 7 performs image processing on image data obtained by reading an original with the image reading unit 2 a and image data input to the multifunction peripheral 100 via the communication unit 73. A portion 74 is provided. The image data processed by the image processing unit 74 is transmitted to, for example, the exposure device 43, used for scanning / exposure of the photosensitive drum 41, stored in the storage unit 72, or transmitted to the external computer 200 or the like. .

  The main control unit 7 is connected to the operation panel 1 so as to be communicable. The main control unit 7 receives input contents and setting contents made on the operation panel 1 from the operation panel 1 and controls the multifunction peripheral 100 so that copying or the like is performed in accordance with the setting of the user.

  The operation panel 1 of the present embodiment includes a display control unit 8, a memory 81, a liquid crystal display unit 5, a touch panel unit 6, a box key 15, and the like. The display control unit 8 includes a CPU, an IC, a driver circuit for a liquid crystal panel of the liquid crystal display unit 5, and the like. First, the display control unit 8 controls the display on the liquid crystal display unit 5. The display control unit 8 receives the output of the touch panel unit 6 and specifies the coordinates of the position pressed on the liquid crystal display unit 5 (touch panel unit 6). Data such as a table indicating correspondence between the output of the touch panel unit 6 and coordinates is stored in the memory 81. The display control unit 8 compares the coordinates of the pressed position with the image data of the screen displayed on the liquid crystal display unit 5, and identifies and recognizes the key selected (pressed) on the screen.

  The display control unit 8 includes a time measuring unit 82 that measures time. Based on the output from the touch panel unit 6, the time measuring unit 82 measures the time from when a key displayed on the liquid crystal display unit 5 is pressed until the next key is pressed. Note that the time may be measured using the timekeeping function of the CPU in the display control unit 8.

  In normal operation, in order to select setting items for each function of the multifunction peripheral 100 and set the setting values, the selection of keys displayed on the liquid crystal display unit 5 is repeated from the uppermost display on the liquid crystal display unit 5. . Then, each time the key is selected, the display control unit 8 switches the display of the liquid crystal display unit 5, and finally the setting value of the function to be selected and set is set. The display control unit 8 recognizes the selection of the function (setting item) and the setting value setting input, and transmits the setting contents to the main control unit 7 of the main body. Thereby, the main control unit 7 causes each unit such as the image forming unit 4a to perform an operation reflecting the function selected and set on the operation panel 1, and the intention of the user is reflected in printing, document reading, and the like. (For example, density setting and enlargement / reduction).

  The memory 81 in the operation panel 1 stores various screens and image data displayed on the liquid crystal display unit 5. Therefore, the display control unit 8 reads the image data of the screen to be displayed next from the memory 81 every time a key in the setting item selection screen 92 or each setting screen 93 is pressed. Then, the display control unit 8 causes the liquid crystal display unit 5 to switch the display.

(Overview of incorrect input prevention)
Next, an outline of prevention of erroneous input on the operation panel 1 according to the embodiment will be described with reference to FIGS. FIG. 4 is an explanatory diagram showing an example of the box initial screen 91 for using the box function. FIG. 5 is an explanatory diagram showing an example of a selection screen 92 for selecting setting items for reading a document. FIG. 6 is an explanatory diagram showing an example of a setting screen 93 for setting the setting value of the setting item of the document size.

  First, the user gradually gets used to the multifunction device 100 (operation panel 1). For example, if settings for frequently used functions are repeated, the display contents of the screen, the display positions of the keys, and the like are stored. Then, the operation panel 1 is touched (pressed) quickly in anticipation. For example, when the screen is switched, an operation of pressing a key immediately without confirming the content of the displayed screen is performed. However, the user presses the key without checking the contents of the displayed screen.

  In addition, when a quick finger motion is performed, even if it is attempted to be pressed only once, it may be unintentionally reflected twice. When the screen is switched by pressing the key for the first time, another key may be arranged at the same position. When such an unintended press is performed twice, the user presses an unintended key (wrong key).

  Even if an incorrect key is pressed, the display control unit 8 usually recognizes that the incorrect key has been pressed and accepts an input. Then, the display control unit 8 performs processing such as causing the liquid crystal display unit 5 to switch the screen display in accordance with the key that has received the input.

  Therefore, if an incorrect key is pressed, operations such as screen switching and setting value change may be required. In particular, when a key for canceling the setting is pressed, the display control unit 8 performs, for example, a process for causing the memory 81 to discard the held setting content. Therefore, the user needs to redo the setting. For example, when a key for instructing the completion of setting of a setting item is erroneously pressed, the display control unit 8 causes the liquid crystal display unit 5 to switch the display from the setting item setting screen 93 to another screen. There is. Then, the user needs to input to the touch panel unit 6, display the closed setting screen 93 on the liquid crystal display unit 5 again, and set the desired setting value again.

  Thus, an erroneous input (wrong key press) may occur due to the user's familiarity. On the other hand, even if there is an erroneous input, there is a case where it can be corrected immediately (with one touch). Therefore, the operation panel 1 of the present embodiment delays the input of a specific key (for example, a cancel key, a confirmation key, etc.) that requires a troublesome setting if it is pressed by mistake that cannot be corrected by one touch. An erroneous input prevention mode is provided. Therefore, the erroneous input prevention mode will be described with reference to FIGS.

  Here, in this description, the erroneous input prevention mode will be described by taking the box function of the multifunction peripheral 100 as an example. The erroneous input prevention mode can also be applied to setting of functions relating to a copy function, a scan function, a transmission function, and the like. The following description of the box function also applies to settings of various functions such as a copy function, a scan function, and a transmission function.

  First, the outline of the box function will be described with reference to FIG. FIG. 4 is an example of the box initial screen 91 displayed by the liquid crystal display unit 5. When the box key 15 on the operation panel 1 is pressed, the display control unit 8 causes the liquid crystal display unit 5 to display a box initial screen 91. In other words, the box initial screen 91 is a screen located in the uppermost layer among the screens related to the box function.

  An area for storing various boxes is virtually secured in the HDD of the storage unit 72 of the multifunction peripheral 100. As the type of box, a custom box (corresponding to the tab of “Custum Box” in FIG. 4) in which a file (image data) read using the image reading unit 2a is stored for the purpose of reuse at a later date, a computer A job box for temporarily storing print jobs and transmission jobs sent from the printer 200 (corresponding to the “Job Box” tab in FIG. 4), an external memory connected to the communication unit 73 (for example, a USB memory or various memory cards) External memory box that captures and stores image data (corresponding to the “Removable Memory” tab in FIG. 4), FAX box that temporarily stores fax transmission jobs (corresponding to the “Fax Box” tab in FIG. 4), etc. There is.

  And FIG. 4 has shown an example of the state which opened the custom box. The box initial screen 91 of the custom box is provided with a list display area F1 for displaying the image data stored in the custom box (storage unit 72) in a list format. In FIG. 4, the data name is “□□□□”, and one file (image data) whose stored user (registrant) is “△△△△” is stored in the custom box. An example of the display is shown.

  The box initial screen 91 includes, for example, an accumulation key K1 (a key labeled “Store File”), a detail key K2 (a key labeled “Detail”), and an open key K3 (“Open”). Attached key) is provided. The key provided on the right side of the box initial screen 91 is a key for searching for a plurality of files stored in the custom box.

  When a file (image data) obtained by reading a document by the image reading unit 2a is newly accumulated and stored in the custom box, the accumulation key K1 is pressed. When confirming the details (for example, data size, number of pages, etc.) of the file stored in the custom box, the file to be confirmed is designated and the detail key K2 is pressed. When the detail key K2 is pressed, the display control unit 8 causes the liquid crystal display unit 5 to display details of the image data selected by touch. When the file stored in the custom box is used for printing or transmission, the file to be used is designated (pressed), and the open key K3 is pressed. When the open key K3 is pressed, for example, the display control unit 8 causes the liquid crystal display unit 5 to display a screen for printing and transmission setting of the designated file.

  Here, in this description, a case where the accumulation key K1 is pressed on the box initial screen 91 will be described. When the accumulation key K1 is pressed on the box initial screen 91, the display control unit 8 causes the liquid crystal display unit 5 to display a setting item selection screen 92 regarding document reading, as shown in FIG.

  FIG. 5 shows the selection screen 92 in a state where the function tab TB1 (tab labeled “Function”) is pressed in the selection screen 92. When the simple setting tab TB2 (the tab labeled “Quick Setup”) is pressed, keys (for example, reduction of reading) narrowed down to setting items (for example, two to three setting items) that are frequently used in experience. Then, a selection screen 92 that can be set for reading is displayed (not shown).

  When the function tab TB1 is pressed, twelve substantially rectangular keys for selecting setting items are displayed on the selection screen 92. The selection screen 92 includes a document size key K4 (a key labeled “Original Size”) for setting the document size, and a duplex key for setting the document type, such as whether the document is double-sided or single-sided. K5 (a key labeled “2-Side / Book Original”), a loading direction key K6 (a key labeled “Original Orientation”) for setting the document loading direction, and the like are provided. In addition, although the function of the key of another setting item is allocated, explanation is omitted.

  Since the setting items cannot be displayed on one screen (there are twelve or more setting items related to document reading), arrow keys K7 and K8 for switching the setting items to be displayed are provided on the selection screen 92. When the arrow keys K <b> 7 and K <b> 8 are pressed, the display control unit 8 causes the liquid crystal display unit 5 to switch the display of setting item keys displayed on the selection screen 92.

  Further, a return key K9 (a key labeled “Back to List”) is arranged at the lower right of the selection screen 92. When the return key K9 is pressed, the display control unit 8 discards all the settings made so far and causes the liquid crystal display unit 5 to display the box initial screen 91 shown in FIG.

  FIG. 6 shows a setting screen 93 for setting items for the original size displayed when the original size key K4 is pressed. When the document size key K4 is pressed, the display control unit 8 causes the liquid crystal display unit 5 to display a setting screen 93 for setting items for the document size. A setting screen 93 is provided for each setting item, and the display control unit 8 displays a corresponding setting screen 93 on the liquid crystal display unit 5 in accordance with the selected (pressed) setting item.

  The setting item setting screen 93 includes a first standard size key K10 (a key labeled “Standard Size1”), a second standard size key K11 (a key labeled “Standard Size2”), and other keys K12 (“ And a size input key K13 (a key labeled “Size Entry”).

  FIG. 6 shows an example of the setting screen 93 that is displayed when the size input key K13 is pressed on the setting screen 93 for setting items for the document size. The size of the document in the horizontal direction can be set using the plus key K14, the minus key K15, or the numeric keypad key K16. Further, the size of the document in the vertical direction can be set as a set value by using the plus key K17, the minus key K18, and the numeric keypad key K19.

  When the first standard size key K10, the second standard size key K11, and the other key K12 are pressed, a plurality of keys indicating standard sizes such as A4 horizontal, A4 vertical, letter size, and the like are displayed. The user can set a standard document size as a setting value by pressing a key corresponding to the displayed paper size.

  An OK key K20 (corresponding to a specific key) and a cancel key K21 (corresponding to a specific key) are provided at the lower right of the original size setting item setting screen 93. An OK key K20 is pressed when the document size setting is completed. When the OK key K20 is pressed, the display control unit 8 recognizes that reading is performed with the set document size, and stores the setting contents in the memory 81. When the cancel key K21 is pressed, the display control unit 8 recognizes that the document size has not been set. When the OK key K20 or the cancel key K21 is pressed, the display control unit 8 causes the liquid crystal display unit 5 to display the selection screen 92 shown in FIG. The OK key K20 and the cancel key K21 are displayed at substantially the same position on the setting screen 93 for any setting item. Therefore, the OK key K20 and the cancel key K21 on the setting screen 93 for any setting item may be used as the specific key. Then, after setting a setting value for a desired setting item, when the start key 12 is pressed, the display control unit 8 transmits the setting content to the main control unit 7. The main control unit 7 causes the document conveying device 2b and the image reading unit 2a to read the document according to the setting content on the operation panel, generates image data (file), and stores the image data in the storage device 72. Let

  Here, when a user who is familiar with the operation erroneously presses the cancel key K21 on the setting screen 93 of the original size setting item by quickly pressing the key, the user inputs the size input key K13 to set the original size. However, the document size must be set again.

  Further, when the OK key K20 is pressed, the display is switched to the selection screen 92. As shown in FIGS. 5 and 6, a key K9 for returning to the selection screen 92 is displayed at the position where the OK key K20 is located on the setting screen 93. Arranged. If the OK key K20 is mistakenly pressed twice without confirming, the return key K9 may be input. When the return key K9 is pressed, all the settings made so far are canceled. In this case, the user must redo all the settings.

  Therefore, the display control unit 8 accepts (recognizes) a key input (press) in an erroneous input prevention mode that delays the acceptance of the input of the specific key when the interval at which the key is pressed is short. Here, in the present embodiment, the specific key is a key (for example, OK key K20) for confirming the setting of the setting item, or a key for canceling the setting content (for example, the cancel key K21 or the return key K9). In addition to the key to be confirmed and the key to be canceled, other keys may be used as the specific key.

(Processing in incorrect input prevention mode)
Next, reception of key input in the erroneous input prevention mode will be described with reference to FIGS. FIG. 7 is an explanatory diagram showing an example of an erroneous input prevention mode setting screen 94 for setting acceptance of key input in the erroneous input prevention mode. FIG. 8 is an explanatory diagram showing an example of the confirmation screen 95. FIG. 9 is an explanatory diagram showing an example of movement of a specific key.

  In the operation panel 1 of the present embodiment, it is possible to set an input reception behavior (such as an input reception condition) of the display control unit 8 in the erroneous input prevention mode. This setting can be performed on the erroneous input prevention mode setting screen 94. The display control unit 8 causes the liquid crystal display unit 5 to display the erroneous input prevention mode setting screen 94 when the user performs an operation of opening the erroneous input prevention mode setting screen 94.

  The erroneous input prevention mode setting screen 94 is provided with a use key K22 and a nonuse key K23. The use key K22 is pressed when delaying acceptance of input of a specific key (when using the erroneous input prevention mode) because the interval at which the key is pressed is short. The details of the timing for entering the erroneous input prevention mode will be described later. The unused key K23 is pressed when the erroneous input prevention mode is not used.

  An OK key K24 and a cancel key K25 are provided in the lower right portion of the erroneous input prevention mode setting screen 94. When the OK key K24 is pressed while the use key K22 is pressed, the display control unit 8 stores setting information indicating that the erroneous input prevention mode may be set in the memory 81. When the OK key K24 is pressed while the unused key K23 is pressed, the display control unit 8 causes the memory 81 to store setting information indicating that the erroneous input prevention mode is not used. Thereby, the user can set with the operation panel 1 whether or not the erroneous input prevention mode is set.

  Five radio buttons (radio button RB1, radio button RB2, radio button RB3, radio button RB4, radio button RB5) are provided below the use key K22 and the non-use key K23. These radio buttons RB1 to RB5 are buttons for setting the input reception behavior (first mode to fifth mode) of the display control unit 8 in the erroneous input prevention mode.

<First mode>
The radio button RB1 is pressed when the erroneous input prevention mode is set to the first mode. In the first mode of the erroneous input prevention mode, the display control unit 8 accepts an input (pressing) of a specific key after a time for ignoring the input (input ignoring time) has elapsed since the previous key was pressed. In other words, in the first mode, the display control unit 8 ignores even if a specific key is pressed before the input ignore time elapses after the previous key is pressed (the specific key is not pressed). ). And the display control part 8 processes according to the specific key which received the input.

  Here, the “input ignore time” in the first mode is a time that can be arbitrarily determined. For example, it is a time for the user to sufficiently confirm the contents of the key to be pressed, and can be set longer than a reference time for determining whether or not the key is quickly pressed due to familiarity. In other words, the input ignoring time may be a time during which a user who is accustomed to the operation can check whether or not his / her key is pressed correctly. For example, the input ignorance time is set to about 2 seconds. If it is about 2 seconds, the user can fully recognize whether or not the correct key is pressed.

  Accordingly, in the normal mode (acceptance of normal key input), the display control unit 8 accepts the key input when the key is simply pressed. Delay input acceptance.

<Second mode>
The radio button RB2 is pressed when the erroneous input prevention mode is set to the second mode. When the specific key is pressed twice in the second mode of the erroneous input prevention mode, the display control unit 8 accepts the input (press) of the specific key. In other words, in the second mode, the display control unit 8 does not recognize that the specific key has been pressed only by pressing the specific key once, and only accepts the input of the specific key after being pressed twice. The display control unit 8 performs processing according to the specific key that has received the input.

  Here, in the second mode, the number of times to be pressed before receiving the input of the specific key is not limited to two times, and may be three times or more. As the number of times increases, the time until the input is accepted becomes longer, and the time for allowing the user to confirm whether or not the correct key is pressed becomes longer. Therefore, the number of times to be pressed before receiving the input of the specific key may be about three times.

  Therefore, in the normal mode (acceptance of normal key input), the display control unit 8 accepts key input simply by pressing the key, but in the erroneous input prevention mode, the number of times of input of a specific key (until it is accepted). By deliberately increasing the number of times of pressing, the acceptance of the input of a specific key is delayed.

<Third mode>
The radio button RB3 is pressed when the erroneous input prevention mode is set to the third mode. In the third mode of the erroneous input prevention mode, the display control unit 8 displays a confirmation screen 95 (dialog) on the liquid crystal display unit 5 for confirming whether or not there is an error in the pressed key when a specific key is pressed. Display. In other words, in the third mode, the display control unit 8 may not recognize that the specific key has been pressed only by pressing the specific key once, and may display the confirmation screen 95 and proceed with the process. When there is an input to the effect (input indicating that there is no error in the pressed specific key), the input of the specific key is accepted. And the display control part 8 processes according to the specific key which received the input.

  This will be described with reference to FIG. FIG. 8 shows an example of the confirmation screen 95 displayed when the return key K9 is pressed in the erroneous input prevention mode on the selection screen 92 described with reference to FIG. As shown in FIG. 8, for example, the display control unit 8 displays the specific key pressed in the erroneous input prevention mode on the confirmation screen 95. In the example shown in FIG. 8, the specific key is the return key K9. Further, the display control unit 8 causes the liquid crystal display unit 5 to display a Yes key K26 and a No key K27 in the confirmation screen 95. Then, when the Yes key K26 is pressed, the display control unit 8 treats the specific key as pressed, accepts the input of the return key K9 in this example, and causes the liquid crystal display unit 5 to display the box initial screen 91. On the other hand, when the Yes key K26 is pressed, it is not handled that the specific key is pressed, and in this example, the input of the return key K9 is not accepted (ignored).

  Therefore, in the normal mode (acceptance of normal key input), the display control unit 8 accepts the key input simply by pressing the key, but in the erroneous input prevention mode, whether or not the user has pressed the correct key. By confirming, the input of the specific key is delayed.

<4th mode>
The radio button RB4 is pressed when the erroneous input prevention mode is set to the fourth mode. In the fourth mode of the erroneous input prevention mode, the display control unit 8 accepts input (pressing) of a specific key when the specific key is pressed for a long time. In other words, in the fourth mode, the display control unit 8 does not recognize that the specific key has been pressed simply by pressing the specific key, and accepts the input of the specific key only after a long press. And the display control part 8 processes according to the specific key which received the input.

  Here, in the fourth mode, the time to be pressed before receiving the input of the specific key (long pressing time until it is recognized as a predetermined long pressing) is, for example, about 2 seconds. If it is about 2 seconds, the user can fully recognize whether or not the correct key is pressed.

  Accordingly, in the normal mode (acceptance of normal key input), the display control unit 8 accepts the key input when the key is simply pressed, but in the erroneous input prevention mode, the display control unit 8 takes a long time until the input of the specific key is accepted. By accepting the pressing, the reception of the input of the specific key is delayed.

<5th mode>
The radio button RB5 is pressed when the erroneous input prevention mode is set to the fifth mode. In the fifth mode of the erroneous input prevention mode, the display control unit 8 determines the position of the specific key on the screen after switching when the position of the specific key after switching the screen overlaps with the position of the key pressed before switching the screen. Move. In other words, in the fifth mode, when the reflective key is pressed twice in the fifth mode, the display control unit 8 specifies on the screen after switching when the specific key is located at the position pressed the second time. Shift the key position. And the display control part 8 processes according to the specific key which received the input.

  This will be described with reference to FIG. FIG. 9 shows an example of the selection screen 92 when the OK key K20 is pressed on the setting screen 93 described with reference to FIG. 6 in the erroneous input prevention mode and the screen is changed (returned) to the selection screen 92. . In the example shown in FIG. 9, the specific key is the return key K9. In FIG. 9, the position of the return key K9 before the movement is indicated by a broken line.

  6 and 9, the position of the OK key K20 on the setting screen 93 of the original size setting item on the liquid crystal display unit 5 and the position of the return key K9 on the selection screen 92 before the movement overlap. Yes. If the user performs an operation of pressing the key continuously (continuously) at the position of the OK key K20 for quick input, the user may accidentally press the return key K9 on the selection screen 92 before the movement. Absent. If the return key K9 is accidentally pressed, the setting is redone. Therefore, as shown in FIG. 9, for example, in the erroneous input prevention mode, the display control unit 8 moves the position of the specific key on the screen after switching so as not to overlap with the position of the key pressed before switching. Let

  Therefore, in the normal mode (acceptance of normal key input), the display control unit 8 simply accepts the key input when the key is pressed and does not move the position of the specific key, but moves the fingertip to change the pressed position. By providing time for movement, the acceptance of the input of the specific key is delayed.

  The user presses one of the radio buttons to determine the mode for accepting the input of the specific key in the erroneous input prevention mode. Then, when the OK key K24 is pressed while any one of the radio buttons is pressed, the display control unit 8 receives the specific key in the erroneous input prevention mode (the mode selected from the first to fifth modes). ) Is stored in the memory 81. And the display control part 8 receives the input of a specific key according to a user's setting in incorrect input prevention mode.

(Transition and return from incorrect input prevention mode and normal mode)
Next, transition between the erroneous input prevention mode and the normal mode will be described using the operation panel 1 of the present embodiment with reference to FIG. FIGS. 10A and 10B are explanatory diagrams for explaining an example of transition between the erroneous input prevention mode and the normal mode.

  The display control unit 8 of the operation panel 1 of the present embodiment accepts an input of a specific key in the erroneous input prevention mode when the interval at which the key is pressed is short. The display control unit 8 measures the time interval at which each key is pressed in order to confirm whether the normal mode should be changed to the erroneous input prevention mode and whether the erroneous input prevention mode should be returned to the normal mode. The time interval at which this key is pressed is measured by, for example, the time measuring unit 82.

  When the time interval is shorter than a predetermined reference time, the display control unit 8 receives an input of a specific key in the erroneous input prevention mode. The reference time is determined in advance, and data indicating the reference time is stored in the memory 81 of the operation panel 1. The “reference time” is a time that can be arbitrarily determined in consideration of the screen size of the display unit (liquid crystal display unit 5), the average distance between keys, and the like. For example, the “reference time” may be determined based on an average key of a user who has become accustomed to the operation by an experiment or the like and an interval of pressing the key. For example, the reference time is about 0.5 seconds. In other words, the reference time is a time for the user to understand the content of the displayed screen and to understand whether or not the key to be pressed is pressed. The display control unit 8 compares the time interval when the touch panel is pressed (time interval when the key is pressed) with the reference time based on the output of the touch panel unit 6, and switches from the normal mode to the erroneous input prevention mode. Check whether or not

  The transition from the normal mode to the erroneous input prevention mode will be described with reference to FIGS. 10 (a) and 10 (b). First, the horizontal axis in FIGS. 10A and 10B shows the flow of time. Each time point T1 to T10 is a time point when a key is pressed by the user (a time point when the display control unit 8 receives an input of the key). It should be noted that the keys pressed at each point in time T1 to T10 are not limited to specific keys, but are intended for all keys. In other words, the display control unit 8 confirms whether or not the time interval at which the key is pressed is shorter than a predetermined reference time for all keys. Δ1 to Δ10 indicate time intervals from when the previous key is pressed until the next key is pressed.

  FIG. 10B shows a case where the time intervals (Δ7 to Δ10) are all longer than the reference time, and shows a case where the normal mode is not shifted to the erroneous input prevention mode. As described above, in the operation panel 1 of the present embodiment, when it is recognized that the user is performing input (pressing a key) while relatively confirming the contents, instead of being always in the erroneous input prevention mode, The display control unit 8 accepts input of a key pressed in the normal mode (regardless of whether or not the key is a specific key).

  In the example shown in FIG. 10A, the time intervals Δ2 to Δ5 are shorter than the reference time. When the time from when a key is pressed to when the next key is pressed is short (at time T2 shown in FIG. 10A), the mode for receiving the input of the specific key of the display control unit 8 is When pressed, the normal mode for accepting input is changed to an erroneous input prevention mode.

  Then, after entering the erroneous input prevention mode, as shown in FIG. 10A, when the time interval at which the key is pressed becomes longer than the reference time, the erroneous input prevention mode is canceled and the normal mode is restored (see FIG. 10). In the example of 10 (a), the normal mode is restored after the key is pressed at time T5 until the key is pressed at time T6).

  The time from when a key is pressed until the erroneous input prevention mode is canceled (return to the normal mode) is, for example, longer than a reference time, and can be arbitrarily determined. For example, after the time from when a key is pressed until the next key is pressed exceeds the reference time, the display control unit 8 cancels the erroneous input prevention mode and accepts the input of a specific key in the normal mode.

  Depending on the erroneous input prevention mode (for example, the first mode), the time until the input of the specific key is accepted may be longer than the reference time. Therefore, the time (until time t1 in FIG. 10A) until the erroneous input prevention mode is canceled (return to the normal mode) may be longer than the reference time. For example, when the reference time is 0.5 seconds and the input ignorance time is 2 seconds, when the time from when a key is pressed until the next key is pressed is longer than the input ignorance time, the display control unit 8 May cancel the erroneous input prevention mode. In other words, the condition for returning from the erroneous input prevention mode to the normal mode can be arbitrarily determined. Based on the time from when a key is pressed until the next key is pressed, the display control unit 8 sets the condition for returning. Whether or not is satisfied can be determined.

(Flow of input reception)
Next, based on FIG. 11, the flow of key input reception on the operation panel 1 of the present embodiment will be described. FIG. 11 is a flowchart illustrating an example of the flow of key input reception on the operation panel 1.

  First, the start of FIG. 11 is a time point when various inputs for job execution can be performed on the operation panel 1 such as selection of setting items and setting of setting values. For example, when the main power supply of the multi-function device 100 is turned on, when power supply is resumed to the operation panel 1 that has been cut off in the power saving mode in response to the cancellation of the power saving mode, This applies to a point in time when the operation panel 1 has received an input during login by authentication.

  First, the display control unit 8 sets the mode for accepting an input of a specific key as a normal mode (step # 1). In other words, the default mode is the normal mode. In the normal mode, when the specific key is pressed, the display control unit 8 recognizes that the specific key is pressed and accepts an input. Then, the display control unit 8 measures the time from when a key is pressed until the next key is pressed (step # 2). Next, the display control unit 8 checks whether or not the measured time interval is shorter than the reference time (step # 3). If the measured time interval is equal to or greater than the reference time (No in step # 3), it is recognized that the user is inputting while confirming, so the flow returns to step # 2.

  On the other hand, if the measured time is shorter than the reference time (Yes in step # 3), the display control unit 8 accepts input of each key in the erroneous input prevention mode (step # 4). In the erroneous input prevention mode, when the specific key is pressed, the display control unit 8 accepts the input of the specific key in any of the first to fifth modes set on the erroneous input prevention mode setting screen 94.

  Even in the erroneous input prevention mode, the display control unit 8 measures the time from when a key is pressed until the next key is pressed (step # 5). Then, the display control unit 8 confirms whether or not to release the erroneous input prevention mode and return to the normal mode based on the measured time interval (step # 6).

  If the condition for returning to the normal mode is satisfied (Yes in step # 6), the display control unit 8 starts accepting input of each key in the normal mode (returns to step # 1). On the other hand, if the condition for returning to the normal mode is not satisfied (Yes in Step # 6), the erroneous input prevention mode should be maintained, and the flow returns to Step # 5. In this way, the transition between the erroneous input prevention mode and the normal mode in the input on the operation panel 1 is performed. Then, when the operation panel 1 is in a state where it does not accept input (when there is a transition to the power saving mode, logout, or the like), this flow ends.

  In this way, the display input device (operation panel 1) according to the present embodiment of the present embodiment displays a plurality of keys for selecting a setting item and setting a setting value for the selected setting item. A display unit (liquid crystal display unit 5) to be displayed on the touch panel, a touch panel unit 6 for detecting a position pressed on the display unit, and a key pressed among keys displayed on the display unit based on an output of the touch panel unit 6 And a display control unit 8 for controlling the display of the display unit and switching the display to the display unit in accordance with the pressed key. The display control unit 8 is pressed by the key. When a time interval is measured and a key is pressed at a time interval shorter than a predetermined reference time, a specific key that is a predetermined specific key (for example, an OK key K20, a cancel key K21, a return key K9, etc.) ) Input Receiving an input of a key input prevention mode erroneous delay the acceptance.

  As a result, when the key is pressed for a short time interval and there is a possibility that the key is pressed without confirming the displayed screen contents or key, it is short after accidentally pressing the previous key due to familiarity Even if a specific key (for example, an OK key K20, a cancel key K21, a return key K9, etc.) is pressed at time intervals, the input is not immediately accepted. In other words, the time required until the input of a specific key is accepted is intentionally reduced, and confirmation of the content of the displayed screen and the key is prompted. Accordingly, processing unintended by the user is performed, setting re-execution can be prevented, and usability of the display input device (operation panel 1) can be improved.

  In addition, acceptance of input is delayed only for specific keys (for example, an OK key K20, a cancel key K21, a return key K9, etc.) that are predetermined specific keys. Thereby, the acceptance of the input of all keys displayed on the display unit (liquid crystal display unit 5) is not delayed. Therefore, even in the erroneous input prevention mode, the delay in setting input does not reach the entire input operation, and it is difficult to prevent quick setting input. Further, the erroneous input prevention mode is set only when the key is pressed at a time interval shorter than a predetermined reference time, and the erroneous input prevention mode is not always set. Therefore, it is difficult to cause a delay in setting input.

  If a cancel key for canceling the setting that has already been made is pressed, processing for discarding the setting contents is performed, and it is necessary to redo the setting. Repeating the previously performed operation is complicated. In addition, the more complicated the operations performed earlier, the more time is required to redo the settings. Therefore, the display control unit 8 causes the display unit (the liquid crystal display unit 5) to display a cancel key for accepting the cancellation of the setting that has already been made, and the cancel key is a specific key. Thereby, it is possible to prevent an erroneous input of the cancel key due to familiarity from being accepted. Therefore, it is possible to prevent troublesome settings from being redone, and to improve the usability of the display input device (operation panel 1).

  Further, when the confirmation key for confirming the setting is pressed, setting of the setting item is completed and the screen display may be largely switched. However, if there is an error in the setting of the confirmed setting item, it is necessary to select the setting item and redo the setting value setting, which may be a complicated operation for the user. Therefore, the display control unit 8 displays a confirmation key for accepting the confirmation of the setting on the display unit (liquid crystal display unit 5), and the confirmation key is a specific key. As a result, it is possible to prevent acceptance of a confirmation key that is erroneously pressed due to familiarity. Therefore, it is possible to prevent troublesome settings from being redone, and to improve the usability of the display input device (operation panel 1).

  Further, in the erroneous input prevention mode, the display control unit 8 selects a specific key (for example, an OK key K20, a cancel key K21, a return key K9, etc.) when a predetermined input ignoring time elapses after the previous key is pressed. ), And even if a specific key is pressed before the input ignore time elapses, it is ignored. Thereby, even if an erroneous specific key is pressed due to familiarity, an input is not immediately accepted. In addition, the user can be made to confirm what the screen contents and the key to be pressed are, and the user can press the correct key after the input ignoring time has elapsed, thereby preventing erroneous input.

  In addition, when the specific key (for example, the OK key K20, the cancel key K21, the return key K9, etc.) is pressed a plurality of times in the erroneous input prevention mode, the display control unit 8 accepts input by the specific key. Thereby, even if an erroneous specific key is pressed due to familiarity, an input is not immediately accepted. Also, the user can confirm the screen contents and the key to be pressed while pressing the key a plurality of times. Then, it is possible to prevent erroneous input by determining whether the correct key is pressed.

  In addition, when the specific key (for example, the OK key K20, the cancel key K21, the return key K9, etc.) is pressed in the erroneous input prevention mode, the display control unit 8 displays the specific key on the display unit (the liquid crystal display unit 5). When a confirmation screen 95 for confirming that the button has been pressed is displayed and a continuation input indicating that the processing may be proceeded is performed on the confirmation screen 95, an input of a specific key is accepted, and a stop input indicating that the processing cannot proceed is performed. If done, ignore specific key input. Thereby, even if an erroneous specific key is pressed due to familiarity, the user is surely confirmed whether or not the input key (pressed key) is correct. Therefore, processing not intended by the user based on erroneous input is not performed.

  In addition, the display control unit 8 specifies the specific key (for example, the OK key K20, the cancel key K21, the return key K9, etc.) during a predetermined long pressing time in the erroneous input prevention mode. Accepts key input. Thereby, even if an erroneous specific key is pressed due to familiarity, an input is not immediately accepted. In addition, while the user is pressing the key, the user can notice whether the screen content or the key being pressed is the correct key. Accordingly, erroneous input can be prevented.

  Further, the display control unit 8 is a specific key at a position overlapping with the position of the key pressed on the screen before switching on the screen after switching to be displayed on the display unit (liquid crystal display unit 5) when the key is pressed. (For example, the OK key K20, the cancel key K21, the return key K9, etc.), and in the erroneous input prevention mode, the position of the specific key on the screen after switching is moved to a non-overlapping position and displayed on the display unit. Let Thus, normally, a key displayed at the same position is pressed, but it is necessary to move the position of the finger in the erroneous input prevention mode. Since the finger movement takes a certain time, it is possible to provide time for recognizing whether or not the key to be pressed is the correct key. Further, it is possible to make it difficult to generate an erroneous key input by pressing twice at the same position or a close position due to familiarity.

  The display control unit 8 cancels the erroneous input prevention mode when the interval from when the previous key is pressed to when the next key is pressed becomes longer than the reference time after the erroneous input prevention mode is set. Thereby, when it is recognized that the user is selecting and inputting (pressing) the key while confirming the contents of the key, the erroneous input prevention mode is canceled. Therefore, when it is recognized that an erroneous input due to familiarity is unlikely to occur, the input is accepted without delay, and the usability of the display input device (operation panel 1) can be improved.

  An image forming apparatus (for example, the multifunction peripheral 100) includes the display input device (operation panel 1) according to any one of claims 1 to 9. Accordingly, since any of the display input devices (operation panel 1) described above is included, an easy-to-use image forming apparatus can be provided.

  Next, another embodiment will be described. In the above embodiment, an example in which the display control unit 8 receives an input to the operation panel 1 has been described. However, instead of the display control unit 8, the main control unit 7 may perform the processing performed by the display control unit 8. good. At this time, the main control unit 7 also functions as a control unit of the operation panel 1.

  Although the embodiment of the present invention has been described, the scope of the present invention is not limited to this, and various modifications can be made without departing from the spirit of the invention.

  The present invention is applicable to a display input device having a display unit and a touch panel unit, and an image forming apparatus.

100 MFP (image forming device) 1 Operation panel (display input device)
5 Liquid crystal display unit (display unit) 6 Touch panel unit 8 Display control unit 95 Confirmation screen K9 Back key (specific key) K20 OK key (specific key)
K21 Cancel key (specific key)

Claims (5)

A display unit that displays a plurality of keys on the screen for selecting a setting item and setting a setting value in the selected setting item;
A touch panel unit for detecting a position pressed on the display unit;
Based on the output of the touch panel unit, it recognizes a pressed key among the keys displayed on the display unit, accepts an input, controls the display of the display unit, and displays a display according to the pressed key. A display control unit for switching to the display unit,
The display control unit measures a time interval at which the key is pressed, and inputs a specific key that is a predetermined specific key when the key is pressed at a time interval shorter than a predetermined reference time. The input of the key is received in the erroneous input prevention mode that delays the reception of the key, and the position of the key pressed on the screen before switching is overlapped on the screen after switching to be displayed on the display unit when the key is pressed. When the specific key is positioned at a position to be moved, and in the erroneous input prevention mode, the position of the specific key on the screen after switching is moved to a position that does not overlap and is displayed on the display unit. Input device. The display control unit causes the display unit to display a cancel key for accepting cancellation of a setting that has already been made,
The display input device according to claim 1, wherein the cancel key is the specific key. The display control unit displays a confirmation key for accepting confirmation of setting on the display unit,
The display input device according to claim 1, wherein the confirmation key is the specific key. The display control unit cancels the erroneous input prevention mode when the interval between the time when the previous key is pressed and the time when the next key is pressed becomes equal to or longer than the reference time after the erroneous input prevention mode is entered. display input device according to any one of claims 1 to 3, characterized in that. An image forming apparatus comprising the display input device according to any one of claims 1 to 4.