Work apparatus and screen display method

Abstract

To provide a work device and a screen display method capable of appropriately displaying an operation screen and a help screen.SOLUTION: A screen display method in a work device equipped with a display input panel includes: displaying a first operation screen among a plurality of operation screens (ST2); if input for displaying a help screen is received while the first operation screen is displayed (Yes in ST3), displaying a first help screen corresponding to the first operation screen together with the first operation screen (ST4); and if input for displaying a second operation screen is received while the first operation screen and the first help screen are displayed (Yes in ST5), displaying the second operation screen and a second help screen corresponding to the second operation screen (ST8).SELECTED DRAWING: Figure 8

Description

Technical Field

[0001] The present invention relates to a work device for displaying an operation screen and a help screen, and a screen display method.

Background Art

[0002] Conventionally, in a work device such as a component mounting device for mounting components on a substrate, a device that displays an operation screen and a help screen on a display unit such as a touch panel is known (for example, Patent Document 1). Patent Document 1 discloses an electronic component mounting system that displays a plurality of command buttons assigned to menu items one-to-one on an operation screen displayed on a display unit, and displays a help screen on the display unit when a command button corresponding to a help item is operated.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in the prior art including Patent Document 1, the help screen displayed on the display unit was associated with the operation screen one-to-one. Therefore, in order to move to another operation screen, an operation to close the opened help screen was required, which was troublesome. There was room for further improvement in order for the operator to operate the operation screen efficiently.

[0005] Therefore, an object of the present invention is to provide a work device and a screen display method capable of appropriately displaying an operation screen and a help screen.

Means for Solving the Problems

[0006] The present invention relates to a work apparatus that includes a display input panel for displaying an operation screen and receiving input from an operator, comprising: a display control means for displaying an operation screen and a help screen on the display input panel; and an input receiving means for receiving input from an operator, wherein the display control means, while displaying a first operation screen among a plurality of operation screens on the display input panel, when the input receiving means receives input for displaying a help screen, displays a first help screen corresponding to the first operation screen together with the first operation screen on the display input panel. When the display control means is displaying the first operation screen and the first help screen on the display input panel, and the input receiving means accepts a selection for help display lock, and then the input receiving means accepts input for displaying the second operation screen, the display control means displays the second operation screen and the first help screen on the display input panel. The display control means, while displaying the first operation screen and the first help screen on the display input panel, The input receiving means receives notification of the release of the help display lock, and thereafter, The input receiving means The aforementioned When input for displaying a second operation screen is received, the display input panel displays the second operation screen and a second help screen corresponding to the second operation screen.

[0007] The present invention relates to a screen display method for a work device equipped with a display input panel that displays an operation screen and accepts input from an operator, wherein the first operation screen among a plurality of operation screens is displayed, and when input for displaying a help screen is received while the first operation screen is displayed, a first help screen corresponding to the first operation screen is displayed together with the first operation screen. When the first operation screen and the first help screen are displayed, the system accepts a request to lock the help display, and then accepts input for displaying the second operation screen, the system displays the second operation screen and the first help screen. With the first operation screen and the first help screen displayed The unlocking of the help display lock is accepted, and thereafter, When input for displaying a second operation screen is received, the second operation screen and a second help screen corresponding to the second operation screen are displayed. [Effects of the Invention]

[0008] According to the present invention, the operation screen and the help screen can be displayed appropriately. [Brief explanation of the drawing]

[0009] [Figure 1] An explanatory diagram showing the configuration of a component mounting device according to one embodiment of the present invention. [Figure 2]Block diagram showing the configuration of the control system for a component mounting device according to one embodiment of the present invention. [Figure 3] An explanatory diagram illustrating an example of help screen data stored in a component mounting device according to one embodiment of the present invention. [Figure 4] (a)(b) Explanatory diagram of an example of a screen displayed on the display input panel of a component mounting apparatus according to one embodiment of the present invention. [Figure 5] (a)(b) Explanatory diagram of an example of a screen displayed on the display input panel of a component mounting apparatus according to one embodiment of the present invention. [Figure 6] (a)(b) Explanatory diagram of an example of a screen displayed on the display input panel of a component mounting apparatus according to one embodiment of the present invention. [Figure 7] (a)(b) Explanatory diagram of an example of a screen displayed on the display input panel of a component mounting apparatus according to one embodiment of the present invention. [Figure 8] Flowchart of a screen display method according to one embodiment of the present invention [Modes for carrying out the invention]

[0010] An embodiment of the present invention will be described in detail below with reference to the drawings. The configurations, shapes, etc. described below are illustrative examples for illustrative purposes and can be modified as appropriate according to the specifications of the component mounting device (working device), operation screen, and help screen. In the following, corresponding elements are denoted by the same reference numerals in all drawings, and redundant explanations are omitted. In Figure 1 and in some parts described later, two mutually orthogonal axes in the horizontal plane are shown: the X-axis in the substrate transport direction (perpendicular to the plane of the paper in Figure 1) and the Y-axis perpendicular to the substrate transport direction (left-right direction in Figure 1). Also, in Figure 1 and in some parts described later, the Z-axis perpendicular to the horizontal plane (up-down direction in Figure 1) is shown.

[0011] First, with reference to Figure 1, the configuration of the component mounting apparatus 1 will be explained. The component mounting apparatus 1 has the function of mounting components supplied from a tape feeder onto a substrate to manufacture mounted substrates. A substrate transport unit 3 is arranged along the X-axis on the upper part of the base 2. The substrate transport unit 3 transports the substrate 4, which has been transported from upstream, to the mounting work position, positions it, and holds it. The substrate transport unit 3 also transports the substrate 4, after the component mounting work is completed, downstream.

[0012] A component supply unit 5 is provided to the side (forward along the Y-axis) of the substrate transport unit 3. A trolley 8 equipped with a feeder base 6 and a reel holding unit 7 is mounted on the component supply unit 5. Multiple tape feeders 9 are arranged along the X-axis on the upper part of the feeder base 6. Multiple reels 11, which store carrier tapes 10 having pockets for holding components, are mounted along the X-axis on the reel holding unit 7. The tape feeders 9 transport the carrier tapes 10 pulled from the reels 11 internally and supply the components stored on the carrier tapes 10 to the component removal position P where they are picked up by the mounting head 12.

[0013] In Figure 1, a mounting head 12 is positioned above the base 2, with a suction nozzle 13 at its lower end for picking up components. The mounting head 12 moves in the X-axis and Y-axis directions by a head movement mechanism (not shown) controlled by a control device 14 of the component mounting device 1. The mounting head 12 has the function of moving the suction nozzle 13 up and down in the Z-axis direction. The mounting head 12 picks up components supplied by the tape feeder 9 to the component removal position P using the suction nozzle 13 and mounts them on the substrate 4 held at the mounting work position of the substrate transport unit 3. The operation of the substrate transport unit 3, the head movement mechanism, and the mounting head 12 is controlled by the control device 14 of the component mounting device 1.

[0014] At the position where an operator works in front of the component mounting device 1, a display input panel 15 such as a touch panel operated by the operator is installed. The display input panel 15 displays an operation screen and various information on its display unit, and also accepts input by the operator's operation using operation buttons and the like displayed on the display unit. The display input panel 15 is connected to the control device 14 by wire or wirelessly, and mutually transmits and receives various information and commands. Thus, the component mounting device 1 is a working device equipped with the display input panel 15.

[0015] Next, referring to FIG. 2, the configuration of the control system of the component mounting device 1 will be described centering on the function of displaying an operation screen and a help screen on the display input panel 15 controlled by the control device 14. The control device 14 included in the component mounting device 1 includes a storage unit 21, a display control means 25, and an input reception means 28. The storage unit 21 is a storage device and stores operation screen data 22, help screen data 23, a display lock flag 24, and the like. The display control means 25 is a data processing device such as a CPU and includes an operation display processing unit 26 and a help display processing unit 27 as internal processing units. The input reception means 28 is a data processing device such as a CPU.

[0016] As will be described later, the operation screen data 22 includes data for the operation display processing unit 26 to display an operation screen on the display input panel 15 in a plurality of languages. As will be described later, the help screen data 23 includes data for the help display processing unit 27 to display a help screen on the display input panel 15 in a plurality of languages. The display lock flag 24 stores information specifying either "unlock" for changing the help screen simultaneously with the operation screen or "lock" for not changing the help screen when changing the operation screen. The display control means 25 displays an operation screen and a help screen on the display input panel 15 based on the operation screen data 22 and the help screen data 23. The input reception means 28 accepts input by the operator's operation of the display input panel 15.

[0017] Here, referring to FIG. 3, an example of the help screen data 23 will be described. The help screen data 23 includes data for displaying the help screen in a plurality of languages such as Japanese (Japanese data 30), English (English data 31), and Chinese (Chinese data 32).

[0018] The Japanese data 30 includes a work A description file 30a for explaining work A in Japanese, a work B description file 30b for explaining work B in Japanese, a work C description file 30c for explaining work C in Japanese, and the like. Similarly, the English data 31 includes a work A description file 31a, a work B description file 31b, and a work C description file 31c for explaining work A, B, and C in English. The Chinese data 32 includes a work A description file 32a, a work B description file 32b, and a work C description file 32c for explaining work A, B, and C in Chinese. Each description file includes text information, as well as diagrams, images, link information, and the like.

[0019] Next, referring to FIGS. 4 to 7, an example of the operation screen and the help screen displayed by the display control means 25 on the display input panel 15 will be described. FIG. 4(a) shows an operation screen 40 (first operation screen) of the main operation of work A displayed by the operation display processing unit 26 of the display control means 25 on the display input panel 15. The operation screen 40 is provided with a work name display column 41, a work selection column 42, a work detail display column 43, a help display button 44, and a language selection button 45.

[0020] In the work name display column 41, information identifying the work name of the operation screen 40 displayed on the display input panel 15 (here, "Work A (main)") is displayed. The work selection column 42 is provided with buttons for selecting the work to be displayed on the operation screen. Here, a work A selection button 42a, a work B selection button 42b, and a work C selection button 42c are displayed. Works A to C are, for example, production work, model switching work, maintenance work, and the like. Note that the number of selection buttons displayed in the work selection column 42 is not limited to three and is appropriately changed according to the types of work of the component mounting apparatus 1 (work apparatus).

[0021] In Figure 4(a), the work details display area 43 displays detailed information about the work selected in the work selection area 42. In this example, the work A selection button 42a is selected in the work selection area 42, and the main menu for work A is displayed in the work details display area 43. That is, when the input receiving means 28 receives input from the worker via the selection button in the work selection area 42 (selection of the work A selection button 42a), the operation display processing unit 26 displays the operation screen 40 related to work A on the display input panel 15 based on the operation screen data 22 stored in the storage unit 21.

[0022] When the operator operates (presses) the help display button 44, the help screen is displayed overlaid on the operation screen 40. In other words, when the input reception means 28 receives the selection input of the help display button 44 by the operator, the help display processing unit 27 displays the help screen overlaid on the operation screen 40 displayed on the display input panel 15, based on the help screen data 23 stored in the storage unit 21.

[0023] In Figure 4(a), when the language is changed by the operator's language selection button 45, the language displayed on the operation screen 40 and the help screen is changed. In this example, since "Japanese" is selected by the language selection button 45, the operation screen 40 is displayed in Japanese. That is, the operation display processing unit 26 displays the Japanese operation screen 40 related to task A on the display input panel 15 based on the operation screen data 22 corresponding to Japanese stored in the storage unit 21.

[0024] Next, referring to Figure 4(b), Figure 4(a) shows the state in which the help display button 44 is operated (pressed) on the operation screen 40, and the help display processing unit 27 displays the help screen 46 (first help screen) for task A overlaid on the operation screen 40. The help screen 46 is provided with a help details display area 46a and a lock button 47. The help details display area 46a displays help information (such as work procedures) for task A corresponding to the operation screen 40. In other words, the help display processing unit 27 displays the information contained in the task A explanation file 30a of the Japanese data 30 of the help screen data 23 stored in the storage unit 21 in the help details display area 46a.

[0025] When the input receiving means 28 receives an input of selection of the lock button 47 by the operator, "Locked" is stored in the display lock flag 24 of the storage unit 21. On the other hand, when the input receiving means 28 receives an input of non-selection of the lock button 47 by the operator, "Not Locked" is stored in the display lock flag 24 of the storage unit 21. In Figure 4(b), the lock button 47 is not selected, so "Not Locked" is stored in the display lock flag 24.

[0026] Thus, when the display input panel 15 is displaying operation screen 40 (the first operation screen) from among multiple operation screens (Figure 4(a)), and the input receiving means 28 receives input for displaying a help screen (selection of the help display button 44), the display control means 25 displays the help screen 46 (the first help screen) corresponding to operation screen 40 (the first operation screen) together with the operation screen 40 (the first operation screen) on the display input panel 15 (Figure 4(b)).

[0027] Figure 5(a) shows the state in which the operation screen 40 shown in Figure 4(b) has the "Select Task B" button 42b selected in the task selection field 42, the operation display processing unit 26 has displayed the operation screen 48 (second operation screen) for the main operation of Task B, and the help display processing unit 27 has displayed the help screen 49 (second help screen) for Task B on the display input panel 15.

[0028] In other words, when the input receiving means 28 receives input from the worker via the work B selection button 42b, the operation display processing unit 26 displays the operation screen 48 related to work B on the display input panel 15 based on the operation screen data 22 stored in the storage unit 21. The help display processing unit 27 also displays the information of the work B explanation file 30b of the Japanese data 30 included in the help screen data 23 stored in the storage unit 21 in the help details display area 49a.

[0029] Thus, when the display lock flag 24 is "unlocked", the display control means 25 displays the operation screen 40 (first operation screen) and the help screen 46 (first help screen) on the display input panel 15 (Figure 4(b)). When the input receiving means 28 receives input for displaying the second operation screen (selection of the work B selection button 42b), it displays the operation screen 48 (second operation screen) and the help screen 49 (second help screen) corresponding to the operation screen 48 (second operation screen) on the display input panel 15 (Figure 5(a)). In other words, when the help display lock is "unlocked", when the operation screen 40 transitions to the operation screen 48, the help screen 46 also automatically switches to the help screen 49 in conjunction.

[0030] Figure 5(b) shows the state in which the operation screen 40 (first operation screen) and help screen 46 (first help screen) shown in Figure 4(b) are displayed on the display input panel 15, and the lock button 47 is selected. When the lock button 47 is selected, "Lock" is stored in the display lock flag 24.

[0031] Figure 6(a) shows the operation screen 40 (first operation screen) and help screen 46 (first help screen) shown in Figure 5(b) displayed on the display input panel 15, with the lock button 47 selected and the task B selection button 42b selected. That is, when the input receiving means 28 receives input for the task B selection button 42b, the operation display processing unit 26 displays the operation screen 48 related to task B on the display input panel 15. On the other hand, the help display processing unit 27 does not change the help screen 46 from the previous help screen 46 related to task A.

[0032] Thus, when the display control means 25 is displaying the operation screen 40 (first operation screen) and the help screen 46 (first help screen) on the display input panel 15 (Figure 4(b)), the input receiving means 28 receives a selection to lock the help display (selection of the lock button 47) (Figure 5(b)), and then, when the input receiving means 28 receives input for displaying the second operation screen (selection of the work B selection button 42b), the display input panel 15 displays the operation screen 48 (second operation screen) and the help screen 46 (first help screen) (Figure 6(a)). In other words, when the help display is "locked", even if the operation screen 40 transitions to the operation screen 48, the help screen 46 remains locked and does not switch to the help screen 49 (second help screen) related to work B.

[0033] Figure 6(b) shows the state in which the lock button 47 has been deselected, with the operation screen 48 and help screen 46 shown in Figure 6(a) displayed on the display input panel 15. When the lock button 47 is deselected, "unlocked" is stored in the display lock flag 24.

[0034] Figure 7(a) shows the state in which the lock button 47 is deselected and the task C selection button 42c is selected, after the operation screen 48 (second operation screen) and help screen 46 (first help screen) shown in Figure 6(b) have been displayed. That is, when the input receiving means 28 receives input from the task C selection button 42c, the operation display processing unit 26 displays the operation screen 50 (third operation screen) related to task C on the display input panel 15. The help display processing unit 27 also displays the help screen 51 (third help screen) related to task C on the display input panel 15.

[0035] Thus, with the display input panel 15 displaying the operation screen 48 (second operation screen) and the help screen 46 (first help screen) (Figure 6(a)), the display control means 25 receives a release of the help display lock (deselection of the lock button 47) (Figure 6(b)), and then, when the input receiving means 28 receives input for displaying the third operation screen (selection of the operation C selection button 42c), it displays the operation screen 50 (third operation screen) and the help screen 51 (third help screen) corresponding to the operation screen 50 (third operation screen) on the display input panel 15 (Figure 7(a)).

[0036] Figure 7(b) shows the state in which the operation screen 50 (third operation screen) and the help screen 51 (third operation screen) shown in Figure 7(a) are displayed on the display input panel 15, and the selection of the help display button 44 has been deselected. When the input receiving means 28 receives input to deselect the help display button 44, the help display processing unit 27 clears the display of the help screen 51 (third operation screen).

[0037] Next, referring to Figure 4(b), we will explain how the display on the display input panel 15 is changed by the display control means 25 when the language selection is changed by the language selection button 45. With the operation screen 40 (first operation screen) and the help screen 46 (first help screen) displayed on the display input panel 15 (Figure 4(b)), when the language is changed from "Japanese" to "Chinese" by the language selection button 45, the display input panel 15 displays the Chinese operation screen 40 (second operation screen) and the Chinese help screen 46 (second help screen) corresponding to the operation screen 40 (second operation screen) (not shown).

[0038] In other words, the operation display processing unit 26 displays a Chinese operation screen 40 related to task A on the display input panel 15 based on the Chinese operation screen data 22 stored in the memory unit 21. The help display processing unit 27 displays the information contained in the task A explanation file 32a of the Chinese data 32 of the help screen data 23 stored in the memory unit 21 in the help details display area 46a.

[0039] Thus, the input for displaying the second operation screen (language selection by the language selection button 45) is a switch from the first language (Japanese) to a second language (Chinese) which is different from the first language (Japanese). The first operation screen (operation screen 40) and the first help screen (help screen 46) are displayed in the first language (Japanese), while the second operation screen (Chinese operation screen 40) and the second help screen (Chinese help screen 46) are displayed in the second language (Chinese).

[0040] Next, following the flow in Figure 8 and referring to Figures 4-7, a screen display method in a work device (component mounting device 1) equipped with a display input panel 15 that displays an operation screen and accepts input from the operator will be described. In Figure 8, when the input receiving means 28 receives the selection of the work A selection button 42a (Yes in ST1), the display control means 25 displays the operation screen 40 (first operation screen) related to work A, one of the multiple operation screens, on the display input panel 15 (ST2) (Figure 4(a)).

[0041] Next, while the operation screen 40 (first operation screen) is displayed, if the input receiving means 28 receives input for displaying the help screen (selection of the help display button 44) (Yes in ST3), the display control means 25 displays the help screen 46 (first help screen) corresponding to the operation screen 40 (first operation screen) together with the operation screen 40 (first operation screen) on the display input panel 15 (ST4) (Figure 4(b)).

[0042] In Figure 8, the operation screen 40 (first operation screen) and the help screen 46 (first help screen) are displayed, and the help display lock is released (lock button 47 is not selected) (Figure 4(b)). When an input for displaying the second operation screen (selection of the work B selection button 42b) is received (Yes in ST5), the display lock flag 24 is "unlocked" (No in ST6), and the display control means 25 displays the operation screen 48 (second operation screen) and the help screen 49 (second help screen) corresponding to the operation screen 48 (second operation screen) on the display input panel 15 (ST8) (Figure 5(a)).

[0043] When the operation screen 40 (first operation screen) and the help screen 46 (first help screen) are displayed, the input receiving means 28 accepts the selection of locking the help display (selection of the lock button 47) (Figure 5(b)), and then accepts input for displaying the second operation screen (selection of the work B selection button 42b) (Yes in ST5), the display lock flag 24 is "locked" (Yes in ST6), and the display control means 25 displays the operation screen 48 (second operation screen) and the help screen 46 (first help screen) on the display input panel 15 (ST9) (Figure 6(a)). In other words, since the help screen is locked, it does not change from the help screen 46 (first help screen) even if the operation screen changes.

[0044] In Figure 8, with the operation screen 48 (second operation screen) and the help screen 46 (first help screen) displayed (ST9), the input receiving means 28 accepts the release of the help display lock (deselection of the lock button 47) (Figure 6(b)). Subsequently, if the input receiving means 28 accepts input for displaying the third operation screen (selection of the work C selection button 42c) (Yes in the second ST5), the display lock flag 24 is "unlocked" (No in ST6), and the display control means 25 displays the operation screen 50 (third operation screen) and the help screen 51 (third help screen) corresponding to the operation screen 50 (third operation screen) on the display input panel 15 (second ST8) (Figure 7(a)). In other words, since the help screen is unlocked, when the operation screen transitions, the help screen also transitions simultaneously.

[0045] If the language selection is changed using the language selection button 45, the input for displaying the second operation screen (language selection by the language selection button 45) (ST5) will be a switch from the first language (Japanese) to a second language (Chinese) which is different from the first language (Japanese). The first operation screen (operation screen 40) and the first help screen (help screen 46) will be displayed in the first language (Japanese) (ST2, ST4), while the second operation screen (Chinese operation screen 40) and the second help screen (Chinese help screen 46) will be displayed in the second language (Chinese) (ST8, ST9).

[0046] As described above, the component mounting apparatus 1 of this embodiment is a work apparatus equipped with a display input panel 15 that displays operation screens 40, 48, 50 and accepts input from the operator, and comprises a display control means 25 that displays operation screens 40, 48, 50 and help screens 46, 49, 51 on the display input panel 15, and an input receiving means 28 that accepts input from the operator.

[0047] Then, with the display input panel 15 displaying the first operation screen (operation screen 40) among multiple operation screens (Figure 4(a)), when the input receiving means 28 receives input for displaying a help screen (selection of the help display button 44), the display control means 25 displays the first help screen (help screen 46) corresponding to the first operation screen on the display input panel 15 together with the first operation screen (Figure 4(b)).

[0048] Furthermore, when the display input panel 15 is displaying the first operation screen and the first help screen (Figure 4(b)), and the input receiving means 28 receives input for displaying the second operation screen (selection of the work B selection button 42b), the display control means 25 displays the second operation screen (operation screen 48) and the second help screen (help screen 49) corresponding to the second operation screen (Figure 5(a)). This allows the operation screens 40, 48, 50 and the help screens 46, 49, 51 to be displayed appropriately.

[0049] In the above description, a component mounting device 1, which mounts components onto a substrate 4 to manufacture a mounted substrate, was used as the working device. However, the working device in this embodiment is not limited to a component mounting device. For example, the working device may be an assembly device for assembling home appliances, or a food processing device for producing processed food products. [Industrial applicability]

[0050] This invention provides a work device and a screen display method that can appropriately display the operation screen and the help screen. [Explanation of symbols]

[0051] 1. Component mounting equipment (working equipment) 15 Display Input Panel 40 Operation screen (First operation screen) 46. ​​Help screen (First help screen) 48 Operation screen (second operation screen) 49. Help screen (second help screen) 50 Operation screen (third operation screen) 51. Help screen (third help screen)

Claims

1. A work device equipped with a display input panel that displays an operation screen and accepts input from the operator, The aforementioned display input panel includes a display control means for displaying an operation screen and a help screen, The system includes an input receiving means for receiving input from the operator's operation, When the display control means is displaying a first operation screen from among a plurality of operation screens on the display input panel, and the input receiving means receives input for displaying a help screen, it displays a first help screen corresponding to the first operation screen on the display input panel together with the first operation screen. When the display control means is displaying the first operation screen and the first help screen on the display input panel, and the input receiving means receives a selection for help display lock, and then the input receiving means receives input for displaying the second operation screen, the display control means displays the second operation screen and the first help screen on the display input panel. The display control means, while the first operation screen and the first help screen are displayed on the display input panel, the input receiving means receives a request to release the help display lock, and thereafter the input receiving means receives an input for displaying the second operation screen, displays the second operation screen and a second help screen corresponding to the second operation screen on the display input panel.

2. The input for displaying the second operation screen is a switch from the first language to a second language different from the first language. The work apparatus according to claim 1, wherein the first operation screen and the first help screen are displayed in the first language, and the second operation screen and the second help screen are displayed in the second language.

3. A screen display method for a work device equipped with a display input panel that displays an operation screen and accepts input from the operator, The first of several operation screens is displayed. When input for displaying a help screen is received while the first operation screen is displayed, the first help screen corresponding to the first operation screen is displayed together with the first operation screen. When the first operation screen and the first help screen are displayed, the system accepts a request to lock the help display, and then accepts input for displaying the second operation screen, the system displays the second operation screen and the first help screen. When the first operation screen and the first help screen are displayed, and the release of the help display lock is accepted, and then input for displaying the second operation screen is accepted, A screen display method that displays the second operation screen and a second help screen corresponding to the second operation screen.

4. The input for displaying the second operation screen is a switch from the first language to a second language different from the first language. The screen display method according to claim 3, wherein the first operation screen and the first help screen are displayed in the first language, and the second operation screen and the second help screen are displayed in the second language.

Images