Field work machine

Abstract

To provide a field work machine in which a control unit is easily electrically connected to a display unit.SOLUTION: A field work machine according to one aspect of the present disclosure includes a display unit, a flexible substrate, and a control unit. The display unit has at least one surface light emitter disposed at a position visible from outside in the field work machine and displays a state of the field work machine. The flexible substrate includes a wiring electrically connected to the at least one surface light emitter. At least one surface light emitter is disposed on the flexible substrate. The control unit is electrically connected to the display unit via the wiring.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present disclosure relates to a work site machine equipped with a display unit. [Background technology]

[0002] The power tool described in Patent Document 1 includes a display unit that uses organic electroluminescence (EL) as a display. The display receives power from a power supply circuit of the controller via a lead wire. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-8356 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned tool, it is necessary to connect lead wires from the display located on the outer surface of the tool to the controller located inside the tool, but it is difficult to route the lead wires through the narrow gaps inside the tool.

[0005] One aspect of the present disclosure provides a work site machine in which a control unit can be easily electrically connected to a display unit inside. [Means for solving the problem]

[0006] A field work machine according to one aspect of the present disclosure includes a display unit, a flexible substrate, and a control unit. The display unit is disposed in a position on the field work machine that is visible from the outside, has at least one surface light emitter, and displays the status of the field work machine. The flexible substrate includes wiring electrically connected to the at least one surface light emitter. The at least one surface light emitter is disposed on the flexible substrate. The control unit is electrically connected to the display unit via the wiring.

[0007] According to the presently disclosed field work machine, the control unit is electrically connected to the display unit via wiring included in the flexible substrate. The flexible substrate is thin and flexible, and can be easily bent while maintaining its electrical properties. Therefore, the control unit can be easily electrically connected to the display unit inside the field work machine. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a diagram showing the appearance of a work site machine according to an embodiment of the present invention; [Figure 2] FIG. 2 is a diagram showing the electrical configuration of the field work machine according to the present embodiment. [Figure 3] FIG. 2 is a diagram showing the top surface of the display unit of the field work machine according to the present embodiment. [Figure 4] 2 is a diagram showing a vertical cross section of a display unit of the work machine for use in a field according to the present embodiment. FIG. [Figure 5] 2 is a diagram showing a flexible substrate and an organic EL display of the on-site operating machine according to the present embodiment. FIG. [Figure 6] FIG. 2 is a diagram showing wiring of a display unit of the on-site work machine according to the present embodiment. [Figure 7] 3 is a diagram showing the connection between the display unit and the controller of the field work machine according to the present embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] [Summary of the embodiment] An embodiment may provide a field work machine having at least one of the following features 1 to 5. Feature 1: A display unit located in a position visible from outside the field work machine. Feature 2: The display unit has at least one surface light-emitting element and displays the status of the work equipment. Feature 3: A flexible substrate including wiring electrically connected to at least one surface light emitter. Feature 4: At least one surface light emitter is disposed on the flexible substrate. Feature 5: A control unit electrically connected to the display unit via wiring.

[0010] According to a field work machine having at least Features 1 to 5, the control unit is electrically connected to the display unit via wiring included in the flexible substrate. Flexible substrates are thin and flexible, and can be easily bent while maintaining their electrical properties. Therefore, the control unit can be easily electrically connected to the display unit inside the field work machine.

[0011] In one embodiment, in addition to or instead of at least one of the above-mentioned features 1 to 5, the following feature 6 may be provided. Feature 6: The control unit controls the turning on and off of at least one surface light emitter.

[0012] In a field work machine having at least the features 1 to 6, the control unit can precisely control the turning on and off of at least one surface light emitter.

[0013] In one embodiment, in addition to or instead of at least one of the above-mentioned features 1 to 6, the following feature 7 may be provided. Feature 7: At least one surface light emitter is an organic electroluminescent (EL) element.

[0014] In a field work machine having at least features 1 to 5 and 7, by using an organic EL as the light source of the display, the display can be made thinner and the viewing angle of the display can be increased.

[0015] In one embodiment, in addition to or instead of at least one of the above-mentioned features 1 to 7, the following feature 8 may be provided. Feature 8: At least one surface light emitter emits light of a single color.

[0016] In a field work machine having at least Features 1 to 5 and 8, by using a monochromatic organic EL as the light source of the display unit, the control unit does not need to control the emitted color, thereby reducing the processing load on the control unit.

[0017] In one embodiment, in addition to or instead of at least one of the above-mentioned features 1 to 8, the following feature 9 may be provided. Feature 9: The at least one surface light emitter includes a first surface light emitter configured to emit light in a first monochromatic color, and a second surface light emitter configured to emit light in a second monochromatic color different from the first monochromatic color.

[0018] In a field work machine having at least features 1 to 5, 8 and 9, the display unit is provided with light sources of multiple colors, so that the display unit can output multiple colors and display more information.

[0019] In one embodiment, in addition to or instead of at least one of the above-mentioned features 1 to 9, the following features 10 to 14 may be provided. Feature 10: The flexible substrate has a first end. Feature 11: The flexible substrate has a second end portion opposite to the first end portion. Feature 12: The flexible substrate is connected to the wiring and includes a connection portion configured to be connected to the control unit. Feature 13: At least one surface light emitter is disposed on the first end side of the flexible substrate. Feature 14: The connection portion is disposed on the flexible substrate at the second end portion.

[0020] In a field work machine having at least Features 1 to 5 and 10 to 14, at least one surface light emitter is disposed on the first end side of the flexible substrate, and the connection part is disposed on the second end side of the flexible substrate, thereby making it possible to easily electrically connect the control part to the display part inside the field work machine.

[0021] In one embodiment, the above-mentioned features 1 to 4 and feature 8 may be included. In a work site machine having at least Features 1 to 4 and 8, at least one surface light emitter emits monochromatic light, so at least one surface light emitter can be turned on without a control unit. Therefore, costs can be reduced compared to when at least one surface light emitter emits polychromatic light.

[0022] In some embodiments, the above features 1 to 14 may be combined in any manner. In some embodiments, any of the above features 1-14 may be omitted.

[0023] (Embodiment) <1. Configuration> <1-1. Overall structure> The configuration of a work machine 1 for on-site use according to this embodiment will be described with reference to Figure 1. The work machine 1 for on-site use according to this embodiment is a chainsaw, which is a type of power tool.

[0024] The work machine 1 for construction sites comprises a main body 50, a guide bar 60, a saw chain 80, a first grip 52, a second grip 53, a hand guard 51, a display unit 21, and a trigger switch 18.

[0025] The main body 50 has a substantially rectangular parallelepiped shape. The guide bar 60 is fixed to the main body 50 so as to protrude from the main body 50. In this embodiment, the direction in which the guide bar 60 extends is referred to as the front-rear direction, and the side from which the guide bar 60 protrudes is referred to as the front. The width direction of the main body 50 is referred to as the left-right direction, and the height direction of the main body 50 is referred to as the up-down direction.

[0026] The saw chain 80 is attached to the guide bar 60. The guide bar 60 supports the saw chain 80 so that it can rotate together with a sprocket (not shown) built into the main body 50. The motor 30 (described later) rotates the sprocket, causing the saw chain 80 to move along the outer periphery of the guide bar 60.

[0027] The first grip 52 connects the left side to the right side of the main body 50 so as to form a space between the first grip 52 and the top surface of the main body 50. The second grip 53 connects the top of the main body 50 to the bottom on the rear surface of the main body 50 so as to form a space between the first grip 52 and the rear surface. A user uses the work implement 1 by holding the first grip 52 with their left hand and the second grip 53 with their right hand.

[0028] The hand guard 51 is disposed in front of the first grip 52 and is connected to an emergency stop mechanism of the motor 30. When the hand of the user holding the first grip 52 tilts the hand guard 51 forward, the motor 30 comes to an emergency stop.

[0029] The display unit 21 is arranged in a position visible from outside the work machine 1. For example, the display unit 21 is arranged on the outer surface of the work machine 1. In this embodiment, the display unit 21 is arranged at the front end of the upper surface of the second grip 53. The display unit 21 includes a surface light emitter 22, which will be described later, and displays the status of the work machine 1 by lighting, flashing, or extinguishing the surface light emitter 22. The status of the work machine 1 includes the operation mode of the work machine 1 and the remaining capacity of the battery 26, which will be described later. The operation mode includes a standard mode, an eco mode, a power mode, etc. The operation mode is selected by the user via a selection switch (not shown). The display unit 21 will be described in detail later.

[0030] The trigger switch 18 is disposed on the second grip 53. More specifically, the trigger switch 18 is disposed in a position where the user can pull it with the hand holding the second grip 53. The user operates the trigger switch 18 to instruct the motor 30 to stop or rotate, and to instruct the rotation speed of the motor 30. When the user pulls the trigger switch 18, an ON signal is input to a controller 31, which will be described later, and when the user releases the trigger switch 18, an OFF signal is input to the controller 31. Furthermore, a pull amount signal corresponding to the amount by which the trigger switch 18 is pulled is input to the controller 31.

[0031] The main body 50 has a circuit board housing portion 501 , a motor housing portion 502 , and a battery mounting portion 503 . The board accommodating section 501 is disposed at the front and upper end of the main body 50. A control board 71, which will be described later, is accommodated in the board accommodating section 501. The motor accommodating section 502 is disposed below the board accommodating section 501, i.e., at the front and lower end of the main body 50. The motor accommodating section 502 accommodates the motor 30.

[0032] The battery mounting section 503 is disposed behind the board housing section 501 and the motor housing section 502 and in front of the second grip 53. A battery pack 15, which will be described later, is detachably mounted in the battery mounting section 503.

[0033] Next, the electrical configuration of the work machine 1 will be described with reference to Figure 2. The work machine 1 includes a control board 71. The battery pack 15 is electrically connected to the control board 71. The battery pack 15 includes a battery 26. The battery 26 includes a plurality of battery cells connected in series. The battery 26 is a rechargeable secondary battery, such as a lithium-ion battery. When the trigger switch 18 is pulled, power is supplied from the battery 26 to the control board 71. When the trigger switch 18 is released, the power supply from the battery 26 to the control board 71 is stopped.

[0034] The control board 71 includes a regulator 36, a controller 31, a gate circuit 32, a drive circuit 33, and a shunt resistor 35. The control board 71 is also connected to a display unit 21, a trigger switch 18, a motor 30, and a rotation sensor 34.

[0035] When an ON signal is input to the control board 71, the regulator 36 steps down the DC voltage (e.g., 14.4 V) supplied from the battery 26 to generate the control voltage Vcc. When an OFF signal is input to the control board 71, the regulator 36 stops generating the control voltage Vcc. The control voltage Vcc has a predetermined DC voltage (e.g., 5 V). The regulator 36 supplies the generated control voltage Vcc to the controller 31 and the like.

[0036] Motor 30 is a three-phase brushless motor. Motor 30 receives power from battery 26 via drive circuit 33 and rotates. Rotation sensor 34 includes Hall elements arranged corresponding to each phase of motor 30. Rotation sensor 34 detects the rotational position of the rotor of motor 30 and outputs a position signal indicating the rotational position to controller 31.

[0037] The drive circuit 33 is a three-phase full-bridge circuit having three high-side switching elements and three low-side switching elements. The six switching elements are transistors, such as MOSFETs. The drive circuit 33 is connected between the positive and negative electrodes of the battery 26 and to the windings of each phase of the motor 30.

[0038] The gate circuit 32 is connected to the controller 31 and also to each switching element of the drive circuit 33. The gate circuit 32 turns each switching element of the drive circuit 33 on or off based on a control signal input from the controller 31.

[0039] The controller 31 includes a microcomputer equipped with a CPU 41, a memory 42, an I / O, etc. The memory 42 includes a ROM, a RAM, and a rewritable non-volatile memory such as a flash ROM or an EPPROM. The controller 31 realizes various functions by the CPU 41 executing various programs stored in the memory 42. In this embodiment, the controller 31 corresponds to an example of an overall control unit of the embodiment.

[0040] The controller 31 detects a current value based on the potential difference between both ends of the shunt resistor 35. The current value corresponds to the magnitude of the current flowing from the battery 26. The controller 31 also calculates the rotation speed of the motor 30 based on the position signal. The controller 31 generates a control signal based on the input pull amount signal, the calculated rotation speed, and the detected current value so that the motor 30 rotates in an operation mode in accordance with instructions from the user. The controller 31 then outputs the generated control signal to the gate circuit 32.

[0041] The controller 31 also controls the turning on and off of the surface emitter 22 of the display unit 21. That is, the controller 31 outputs a lighting-on signal to the surface emitter 22 to turn on the surface emitter 22. The controller 31 also outputs a lighting-off signal to the surface emitter 22 to turn off the surface emitter 22. The controller 31 alternately outputs lighting-on signals and lighting-off signals to the surface emitter 22 to blink the surface emitter. The controller 31 outputs a lighting-on signal or a lighting-off signal to the surface emitter 22 according to the information to be notified by the display unit 21.

[0042] <1-2. Display configuration> The configuration of the display unit 21 will be described with reference to Fig. 3 to Fig. 6. As shown in Fig. 4, the display unit 21 is disposed on a flexible substrate 25. As shown in Figs. 4 and 5, the display unit 21 includes a lens 23 and at least one surface light emitter 22. In this embodiment, the display unit 21 has a rectangular shape.

[0043] Each of the at least one surface emitter 22 is a first organic electroluminescent (EL) 22a or a second organic EL 22b. In this embodiment, the display unit 21 includes six surface emitters 22, three of which are first organic EL 22a and the remaining three are second organic EL 22b. The first organic EL 22a emits light in a first single color. The second organic EL 22b emits light in a second single color different from the first single color. For example, the first single color is red, and the second single color is white.

[0044] The lens 23 is colorless and transparent and has a rectangular shape. The lower surface of the lens 23 faces the flexible substrate 25 and has a masking portion 231 and a transmissive portion 232. The masking portion 231 is painted black and blocks light from the flexible substrate 25 side. The transmissive portion 232 is unpainted and allows light from the flexible substrate 25 side to pass to the upper surface of the lens 23. The first organic EL element 22a and the second organic EL element 22b are disposed on the flexible substrate 25 at positions facing the transmissive portion 232. Note that in another embodiment, the lens 23 is not limited to a rectangular shape and may have any shape, such as a circle, an ellipse, or a polygon.

[0045] The transparent portion 232 is formed in a shape corresponding to the information to be notified. Specifically, the transparent portion 232 is formed in an icon corresponding to the information to be notified. In this embodiment, as shown in Fig. 3, the transparent portion 232 includes an icon 211 indicating the remaining capacity of the battery 26 and an icon 212 indicating the operation mode of the site work machine 1.

[0046] For example, when the remaining capacity of the battery 26 is low, the controller 31 lights up the first organic EL 22a or the second organic EL 22b opposite the icon 211, and when the remaining capacity of the battery 26 is high, the controller 31 turns off the first organic EL 22a or the second organic EL 22b opposite the icon 211. The display unit 21 displays that the battery 26 needs to be charged.

[0047] Furthermore, when the operation mode of the site work machine 1 is the eco mode, the controller 31 turns on the first organic EL 22a or the second organic EL 22b opposite the icon 212, and when the operation mode of the site work machine 1 is other than the eco mode, the controller 31 turns off the first organic EL 22a or the second organic EL 22b opposite the icon 212. The display unit 21 displays that the site work machine 1 is operating in the eco mode.

[0048] In another embodiment, the display unit 21 may display information other than the remaining capacity of the battery 26 and the operation mode of the work machine 1, or may display only one piece of information or three or more pieces of information. Also, in another embodiment, the transparent portion 232 may be formed as characters, symbols, etc. other than icons.

[0049] In general, organic EL elements have low light directivity and emit light from a wide surface. On the other hand, light-emitting diodes (LEDs) have high light directivity and emit light from a point. Therefore, the distance between the organic EL elements and the display surface can be narrower than the distance between the LEDs and the display surface. That is, when the first organic EL element 22a and the second organic EL element 22b are arranged below the lens 23, the first organic EL element 22a and the second organic EL element 22b can be arranged closer to the lower surface of the lens 23 than when the LEDs are arranged below the lens 23. As a result, when the first organic EL element 22a and the second organic EL element 22b are arranged, the viewing angle of the icons 211 and 212 can be increased compared to when the LEDs are arranged. Therefore, the icons 211 and 212 can be viewed from an oblique direction.

[0050] Flexible substrate 25 is made of a thin insulating material (for example, a plastic film such as polyimide), and is light, thin, and can be bent while maintaining its electrical properties. As shown in Figures 5 and 6, flexible substrate 25 includes a base film 252 made of an insulating material, a coverlay 251 made of an insulating material, and wiring 91 to 97.

[0051] The flexible substrate 25 has a first end and a second end. The second end faces the first end in the extension direction of the flexible substrate 25. The flexible substrate 25 has a first portion 25a on the first end side and a second portion 25b on the second end side. The first portion 25a has a size and shape corresponding to the lens 23. The second portion 25b has a shape that is more elongated than the first portion 25a. Note that in another embodiment, the second portion 25b may have a shape that is wider than the first portion 25a or shorter than the first portion 25a.

[0052] 6, three first organic EL elements 22a and three second organic EL elements 22b are arranged side by side in the first portion 25a of the base film 252. Each of the first organic EL elements 22a and each of the second organic EL elements 22b has a rectangular shape. In another embodiment, the shape of each of the first organic EL elements 22a and each of the second organic EL elements 22b is not limited to a rectangular shape and may be any shape, such as a circular shape or an elliptical shape.

[0053] Furthermore, wirings 91 to 97 electrically connected to the three first organic EL elements 22 a and the three second organic EL elements 22 b are arranged around the three first organic EL elements 22 a and the three second organic EL elements 22 b in the first portion 25 a of the base film 252. The wirings 91 to 97 are made of conductive foil (e.g., copper foil) adhered to the base film 252.

[0054] Wirings 91 to 97 are arranged at predetermined intervals on the second portion 25b of the base film 252. The wiring 91 is a positive electrode line common to the three first organic EL elements 22a and the three second organic EL elements 22b. The wirings 92 to 97 are negative electrode lines for each of the three first organic EL elements 22a and the three second organic EL elements 22b.

[0055] In the first portion 25a, the coverlay 251 covers the base film 252 except for the top surfaces of the three first organic EL elements 22a and the three second organic EL elements 22b. In the second portion 25b, the coverlay 251 covers the base film 252 except for the exposed portion 190. The exposed portion 190 is the tip portion of the wiring 91 to 97. In other words, the wiring 91 to 97 is sandwiched between the base film 252 and the coverlay 251 except for the exposed portion 190. In another embodiment, the coverlay 251 may be omitted.

[0056] As shown in FIG. 7, the exposed portion 190 is directly inserted into the control board connector 78 attached to the control board 71. By directly inserting the exposed portion 190 into the control board connector 78, a connector on the flexible board 25 side can be omitted, thereby reducing costs. The first organic EL 22a and the second organic EL 22b are arranged on the first end side of the flexible board 25, and the exposed portion 190 is arranged on the second end side. In this embodiment, the exposed portion 190 corresponds to an example of a general connection portion of the embodiment. Note that, although FIG. 7 shows that a portion of the exposed portion 190 is inserted into the control board connector 78, the front portion of the exposed portion 190 may be inserted into the control board connector 78.

[0057] The controller 31 is electrically connected to the three first organic EL devices 22a and the three second organic EL devices 22b via the control board connector 78, the exposed portion 190, and the wiring 91 to 98. As shown in Fig. 1, the battery mounting portion 503 is disposed between the display unit 21 and the board housing portion 501. Therefore, the wiring 91 to 97 must be routed from the board housing portion 501 to the display unit 21 through the narrow space behind the battery mounting portion 503.

[0058] When the control board 71 is connected to the display unit 21 by a lead wire, it is difficult to pass the lead wire through the narrow space between the display unit 21 and the control board 71. Therefore, when a lead wire is used, the display unit 21 must be placed close to the control board 71, which reduces the degree of freedom in the placement of the display unit 21 and the control board 71. On the other hand, the flexible board 25 is thin and highly flexible, and can be bent while maintaining its electrical properties, making it easy to pass the flexible board 25 through the narrow space between the display unit 21 and the control board 71. Therefore, by using the flexible board 25, the display unit 21 can be placed away from the control board 71, which increases the degree of freedom in the placement of the display unit 21 and the control board 71.

[0059] The wiring 91 is connected to the power supply 79 via the exposed portion 190 and the control board connector 78. The power supply 79 supplies the control voltage Vcc generated by the regulator 36. The wiring 92, 93, 94, 95, 96, and 97 are connected to the switching elements 72, 73, 74, 75, 76, and 77 via the exposed portion 190 and the control board connector 78, respectively. The switching elements 72, 73, 74, 75, 76, and 77 are connected to the controller 31 and are controlled to be turned on and off by the controller 31. The switching elements 72, 73, 74, 75, 76, and 77 are turned on when a lighting-on signal is output from the controller 31, and are turned off when a lighting-off signal is output from the controller 31. The switching elements 72, 73, 74, 75, 76, and 77 are transistors, such as bipolar transistors.

[0060] When the switching element 72 is in the on state, the wiring 91, 92 is energized, and the first organic EL 22a electrically connected to the switching element 72 is lit. When the switching element 72 is in the off state, the wiring 92 is interrupted, and the first organic EL 22a electrically connected to the switching element 72 is turned off. The first organic EL 22a and the second organic EL 22b electrically connected to the switching elements 73, 74, 75, 76, and 77 also operate in the same manner as the first organic EL 22a electrically connected to the switching element 72.

[0061] In another embodiment, as shown by the dashed line in Fig. 7, a flexible board connector 98 may be attached to the exposed portion 190. The flexible board connector 98 is configured to be detachable from the control board connector 78. That is, the wiring 91 to 97 may be connected to the control board connector 78 via the flexible board connector 98. By attaching the flexible board connector 98 to the exposed portion 190, if the flexible board 25 breaks down, it becomes easy to disconnect the connectors and repair the flexible board 25. In this case, the exposed portion 190 and the flexible board connector 98 correspond to an example of a connecting portion in the embodiment.

[0062] <2. Effects> According to the present embodiment described above in detail, the following effects are achieved. (1) The controller 31 is electrically connected to the display unit 21 via the thin and flexible substrate 25. Therefore, the controller 31 can be easily electrically connected to the display unit 21 inside the work machine 1.

[0063] (2) The controller 31 can precisely control the turning on and off of the first organic EL element 22a and the second organic EL element 22b. (3) By using an organic EL as the light source of the display unit 21, the display unit 21 can be made thinner and the viewing angle of the display unit 21 can be increased.

[0064] (4) Because the first organic EL element 22a and the second organic EL element 22b are monochromatic EL elements, the controller 31 does not need to control the emission color of the first organic EL element 22a and the second organic EL element 22b, which reduces the processing load on the controller 31.

[0065] (5) Since the color of light emitted from the first organic EL element 22a is different from the color of light emitted from the second organic EL element 22b, the display unit 21 can output a plurality of colors, which in turn allows the display unit 21 to display more information.

[0066] (6) Since the first organic EL 22a and the second organic EL 22b are arranged on the first end side of the flexible substrate 25 and the exposed portion 190 is arranged on the second end side of the flexible substrate 25, the controller 31 can be easily electrically connected to the display unit 21 inside the field work machine.

[0067] (Other embodiments) Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments and can be implemented in various modified forms.

[0068] (a) In the above embodiment, the work machine 1 is a chainsaw, but the work machine 1 of the present disclosure is not limited to a chainsaw. The work machine 1 may be a power tool other than a chainsaw, or may be a gardening tool. The power tool may be, for example, a driver drill, an impact driver, a circular saw, or the like. The gardening tool may be, for example, a brush cutter, a trimmer, or the like. The work machine 1 may also be a light or the like that does not have a motor.

[0069] (b) In the above embodiment, the display unit 21 includes the first organic EL element 22a and the second organic EL element 22b, but it may include only one of them. That is, the display unit 21 may emit light in only one color. Furthermore, the display unit 21 may include, in addition to the first organic EL element 22a and the second organic EL element 22b, an organic EL element that emits light in a single color different from the first single color and the second single color.

[0070] (c) In the above embodiment, the display unit 21 includes a plurality of first organic EL elements 22a and a plurality of second organic EL elements 22b, but it may include only one first organic EL element 22a or only one second organic EL element 22b.

[0071] (d) In the above embodiment, the controller 31 controlled the turning on and off of the first organic EL 22a and the second organic EL 22b. However, the controller 31 does not have to control the turning on and off of the first organic EL 22a and the second organic EL 22b. The first organic EL 22a and the second organic EL 22b may be directly connected to the regulator 36. The first organic EL 22a and the second organic EL 22b may be turned on by receiving power from the regulator 36 when the power to the work machine 1 is turned on, and may be turned off when the power to the work machine 1 is turned off. In this case, the first organic EL 22a and the second organic EL 22b do not have to be connected to the controller 31.

[0072] (e) In the above embodiment, the first organic EL element 22a and / or the second organic EL element 22b emits a single color, but they may emit multiple colors. When the first organic EL element 22a and / or the second organic EL element 22b emits multiple colors, the controller 31 controls the colors to be emitted.

[0073] (f) In the above embodiment, the three first organic ELs 22a and the three second organic ELs 22b were connected to a common positive electrode line and individual negative electrode lines, but they may also be connected to individual positive electrode lines and a common negative electrode line.

[0074] (g) In the above embodiment, the exposed portion 190 is connected to the control board connector 78 directly or via the flexible board connector 98, but the embodiments are not limited to this. The exposed portion 190 may be connected to a lead wire, and the lead wire may be attached to the flexible board connector 98. The wiring 91 to 97 may be connected to the control board connector 78 via the lead wire and the flexible board connector 98. For example, if the work machine 1 is a brush cutter, the display unit 21 is disposed on the handle located midway along the pole, and the control board 71 is disposed in a case at the bottom end of the pole. In this case, the flexible board 25 may be passed through the interior of the handle, which is relatively narrow and short, and the lead wire may be passed through the interior of the pole, which is relatively wide and long.

[0075] (h) In the above embodiment, the surface light emitter 22 is an organic EL element, but the surface light emitter 22 may also be an inorganic EL element.

[0076] (i) In the above embodiments, the controller 31 may, instead of or in addition to a microcomputer, comprise a combination of various individual electronic components, an Application Specified Integrated Circuit (ASIC), an Application Specific Standard Product (ASSP), a programmable logic device such as an FPGA (Field Programmable Gate Array), or a combination of these.

[0077] (j) Multiple functions of one component in the above embodiments may be realized by multiple components, or one function of one component may be realized by multiple components. Also, multiple functions of multiple components may be realized by one component, or one function realized by multiple components may be realized by one component. Also, part of the configuration of the above embodiments may be omitted. Also, at least part of the configuration of the above embodiments may be added to or substituted for the configuration of another of the above embodiments. [Explanation of symbols]

[0078] 1...field work machine, 21...display unit, 22...surface light emitter, 23...lens, 25...flexible board, 31...controller, 50...main body, 71...control board, 78...control board connector, 91-97...wiring, 98...flexible board connector, 190...exposed portion, 501...board accommodating portion, 502...motor accommodating portion, 503...battery mounting portion, 22a...first organic EL, 22b...second organic EL.

Claims

1. a display unit disposed in a position visible from the outside of the work machine, the display unit having at least one surface light-emitting element and configured to display the status of the work machine; a flexible substrate including wiring electrically connected to the at least one surface light emitter, and the at least one surface light emitter is disposed on the flexible substrate; a control unit electrically connected to the display unit via the wiring, On-site work equipment.

2. The control unit is configured to control turning on and off of the at least one surface light emitter. The work site machine according to claim 1.

3. The at least one surface emitter is an organic electroluminescent element.

3. A work site machine according to claim 1 or 2.

4. The at least one surface emitter is configured to emit monochromatic light. The on-site work machine according to any one of claims 1 to 3.

5. The at least one surface light emitter includes a first surface light emitter configured to emit light in a first monochromatic color, and a second surface light emitter configured to emit light in a second monochromatic color different from the first monochromatic color. The work machine for use on site according to claim 4.

6. The flexible substrate is A first end portion; a second end opposite the first end; a connection portion connected to the wiring and configured to be connected to the control portion, the at least one surface light emitter is disposed on the flexible substrate at the first end side, the connection portion is disposed on the flexible substrate on the second end side; A work site machine according to any one of claims 1 to 5.

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