Work machine and display

Abstract

The invention provides a work machine and a display. The working machine includes a housing, a support structure, and a lens. The support structure is configured so as to be able to support the first light-emitting element and the second light-emitting element, which irradiate light in the first direction, on the inside of the housing. The lens is configured so as to propagate light from the light-emitting element supported by the support structure on the inside of the housing to the outside of the housing. The working machine is configured to display information by lighting using a lens. The support structure is configured so as to be able to support the first light-emitting element and the second light-emitting element at positions where a first distance and a second distance on an imaginary plane orthogonal to the first direction are different from each other. The first distance is the distance between the reference point and the first light-emitting element. The second distance is the distance between the reference point and the second light-emitting element.

Description

Technical Field

[0001] The present invention relates to a working machine and a display. Background Art

[0002] Japanese Patent Publication No. 2020-93343 discloses a technology for displaying the status of a work machine by lighting a light-emitting element. The light-emitting element is, for example, a light-emitting diode (LED). For example, a plurality of LEDs are prepared to display a variety of information. For example, light from a plurality of LEDs passes through a single lens provided respectively and propagates to the outside, displaying the status of the work machine to a user.

[0003] In the conventional method of providing a single lens for each of a plurality of light emitting elements, when a plurality of light emitting elements are provided in a working machine in order to display a variety of information, a plurality of lenses also need to be provided in the working machine.

[0004] It is inefficient to prepare a lens for each light-emitting element. In order to suppress such inefficiency, it is possible to consider making the lens common for multiple light-emitting elements. According to one example, commonality can be achieved by configuring multiple light-emitting elements for a common lens. According to another example, a lens is prepared as a common component for multiple working machines, and different light-emitting elements are configured for the lens according to the type of working machine, thereby achieving commonality.

[0005] However, when a common lens is used for a plurality of light emitting elements, the light emitting elements have different characteristics, so that the appearance of the light passing through the lens may be different from the viewpoint of information display, which is not desirable. Summary of the invention

[0006] Therefore, in one aspect of the present invention, it is desirable to provide a new technology related to the configuration of multiple light emitting elements relative to a lens.

[0007] A working machine according to one embodiment of the present invention comprises: a housing, a support structure, and a lens. The support structure is configured to support a first light emitting element and a second light emitting element that irradiate light in a first direction on the inner side of the housing. The lens is configured to propagate light from the light emitting element supported by the support structure on the inner side of the housing to the outer side of the housing. The working machine is configured to display information by lighting a light using the lens.

[0008] According to one embodiment of the present invention, the support structure can be configured to support the first light-emitting element and the second light-emitting element at positions where the first distance and the second distance are different on an imaginary plane orthogonal to the first direction. The first distance can be the distance between the reference point and the first light-emitting element. The second distance can be the distance between the reference point and the second light-emitting element.

[0009] The reference point may be a point where the intensity of light that passes through the lens and propagates to the outside of the housing is maximum when light is irradiated toward the first direction from a corresponding point among points on a virtual plane orthogonal to the first direction.

[0010] Even if a plurality of light emitting elements are arranged at the same relative position with respect to the lens, the lighting pattern of the light outside the housing visually perceived by the user will differ for each light emitting element due to the characteristics of the light emitted from the light emitting element, such as the intensity and wavelength of the light.

[0011] According to the structure that can support multiple light-emitting elements in a manner where the distances from the reference point are different, each of the multiple light-emitting elements can be arranged relative to the lens so as to suppress the discomfort caused to the user by the difference in appearance caused by lighting. Therefore, according to one aspect of the present invention, a technology suitable for displaying information to the user can be provided with respect to the arrangement of multiple light-emitting elements relative to the lens.

[0012] According to another embodiment of the present invention, a display may be provided. The display includes a support structure and a lens. The support structure is configured to support a first light emitting element and a second light emitting element that emit light in a first direction on the inner side of the display. The lens is configured to propagate light from the light emitting element supported by the support structure on the inner side of the display to the outer side of the display. The display is configured to display information by lighting up the lens.

[0013] According to another embodiment of the present invention, the support structure of the display may be configured to support the first light emitting element and the second light emitting element at positions where the first distance and the second distance on an imaginary plane orthogonal to the first direction are different. The first distance may be the distance between the reference point and the first light emitting element. The second distance may be the distance between the reference point and the second light emitting element. The reference point may be the point where the intensity of light that passes through the lens and propagates to the outside of the display is the maximum when light is irradiated toward the first direction from a corresponding point among the points on the imaginary plane orthogonal to the first direction.

[0014] According to this display, the same effects as those of the above-mentioned working machine can be produced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Hereinafter, an exemplary embodiment of the present invention will be described as an example with reference to the drawings.

[0016] Figure 1 It is a block diagram showing the electrical configuration of an exemplary working machine.

[0017] Figure 2 It is a perspective view of an exemplary lawn mower.

[0018] Figure 3 It is a plan view showing the periphery of the display surface of the display housed inside the housing.

[0019] Figure 4 This is a schematic cross-sectional view of a display housed inside a housing.

[0020] Figure 5 It is a stereogram of the display.

[0021] Fig. 6A is a top view of the display. Figure 6B is a side view of the display.

[0022] Figure 7 This is a VII-VII cross-sectional view of the display.

[0023] Figure 8 This is a VIII-VIII cross-sectional view of the display.

[0024] Fig. 9 The graph is a relative visibility graph having a horizontal axis of wavelength and a vertical axis of relative visibility.

[0025] Fig.10 This is an explanatory diagram regarding the arrangement of the second LED.

[0026] Fig.11 This is an explanatory diagram regarding the arrangement of the first LED.

[0027] Fig. 12A , Fig. 12B ,as well as Fig. 12C The following are diagrams sequentially showing simulation results regarding brightness distribution using lenses having apex angles of 40 degrees, 50 degrees, and 60 degrees.

[0028] Fig.13A ,as well as Fig. 13B The following are diagrams sequentially showing simulation results regarding brightness distribution using lenses having apex angles of 70 degrees and 80 degrees.

[0029] Fig.14 It is a diagram for explaining the arrangement of the first LED and the second LED in a modified example.

[0030] Fig.15A , Fig. 15B ,as well as Fig. 15C It is a diagram for explaining the structure of a display according to a modified example. DETAILED DESCRIPTION

[0031] [1. Overview of Implementation Methods]

[0032] One embodiment provides a working machine. The working machine may have at least one of the following features.

[0033] ·Feature 1: The working machine has a casing.

[0034] ·Feature 2: The working machine has a supporting structure.

[0035] Feature 3: The support structure is configured to be able to support the first light emitting element and the second light emitting element inside the housing.

[0036] Feature 4: The support structure can support the first light emitting element and the second light emitting element so as to irradiate light in the first direction.

[0037] ·Feature 5: The working machine has a lens.

[0038] Feature 6: The lens is configured to receive light from a light emitting element supported by a support structure inside the housing.

[0039] Feature 7: The lens is configured to propagate light from a light emitting element supported by a supporting structure inside the housing to the outside of the housing.

[0040] ·Feature 8: The operating mechanism is configured to display information by lighting a lens.

[0041] Feature 9: The support structure is configured to support the first light-emitting element and the second light-emitting element at positions where the first distance and the second distance on the imaginary plane orthogonal to the first direction are different. The first distance is the distance between the reference point and the first light-emitting element. The second distance is the distance between the reference point and the second light-emitting element.

[0042] Feature 10: The reference point is a point where the intensity of light that passes through the lens and propagates to the outside of the housing when light is irradiated toward the first direction from a corresponding point among the points on the virtual plane is maximum.

[0043] Even if a plurality of light emitting elements are arranged at the same relative position with respect to the lens, the lighting pattern of the light outside the housing visually perceived by the user will differ for each light emitting element due to the characteristics of the light emitted from the light emitting element, such as the intensity and wavelength of the light.

[0044] Since the working machine having features 1 to 10 can support a plurality of light emitting elements at different distances from the reference point, each of the plurality of light emitting elements can be arranged relative to the lens so as to suppress the discomfort caused to the user by the difference in appearance caused by lighting. That is, according to features 1 to 10, the plurality of light emitting elements can be arranged relative to the lens so as to be suitable for displaying information to the user.

[0045] In a certain embodiment, the working machine may have the following features in addition to or instead of at least any one of the features 1 to 10.

[0046] Feature 11: The first light emitting element and the second light emitting element are light emitting elements that emit light having at least one of a wavelength and an intensity that is different from each other.

[0047] According to the working machine having the eleventh aspect, the relative arrangement of the plurality of light emitting elements with respect to the lens can be performed in consideration of at least one of the wavelength and the intensity of the light emitted from the light emitting elements.

[0048] In a certain embodiment, the working machine may have at least one of the following features in addition to or instead of at least one of the features 1 to 11.

[0049] Feature 12: The second light emitting element is a light emitting element that emits light of a wavelength having a higher relative visibility than the light emitted by the first light emitting element.

[0050] Feature 13: The second light emitting element is a light emitting element that emits light with a higher intensity than the light emitted by the first light emitting element.

[0051] Feature 14: The support structure is configured to support the first light emitting element and the second light emitting element at a position where the distance between the reference point on the virtual plane and the second light emitting element is longer than the distance between the reference point and the first light emitting element.

[0052] According to the working machine having the features 12 and 14, the first light emitting element and the second light emitting element can be arranged at positions that take into account the difference in relative visibility of the light emitted from the first light emitting element and the second light emitting element. According to the working machine having the features 13 and 14, the first light emitting element and the second light emitting element can be arranged at positions that take into account the difference in intensity of the light emitted from the first light emitting element and the second light emitting element.

[0053] In a certain embodiment, the working machine may have at least one of the following features in addition to or instead of at least one of the features 1 to 14.

[0054] Feature 15: The support structure is configured to support the first light emitting element and the second light emitting element at a position where the light propagation rate of light emitted from the second light emitting element is lower than the light propagation rate of light emitted from the first light emitting element.

[0055] Feature 16: The light propagation rate is the ratio of the light emitted from the light emitting element that passes through the lens and propagates to the outside of the housing.

[0056] According to the work machine having features 15 and 16, when at least one of the relative visibility and intensity of the light emitted from the second light-emitting element is relatively higher than that of the first light-emitting element, the difference in appearance caused by lighting can be suppressed, thereby suppressing the discomfort caused to the user by the difference in appearance.

[0057] In a certain embodiment, the working machine may have the following features in addition to or instead of at least any one of the features 1 to 16.

[0058] Feature 17: The support structure is configured to be able to support the first light emitting element and the second light emitting element on the same plane parallel to the imaginary plane.

[0059] In a certain embodiment, the working machine may have the following features in addition to or instead of at least any one of the features 1 to 17.

[0060] Feature 18: The supporting structure is a circuit board on which the first light emitting element and the second light emitting element can be mounted.

[0061] According to the working machine having the eighteenth feature, the first light emitting element and the second light emitting element can be mounted on the circuit board in an appropriate relative arrangement with respect to the lens.

[0062] In a certain embodiment, the working machine may have the following features in addition to or instead of at least any one of the features 1 to 18.

[0063] Feature 19: The support structure is configured to be able to support the first light emitting element at the reference point.

[0064] In a certain embodiment, the working machine may have at least one of the following features in addition to or instead of at least one of the features 1 to 19.

[0065] Feature 20: The lens has a light receiving surface that faces the inside of the housing and receives light from the light emitting element supported by the support structure.

[0066] Feature 21: The support structure is configured to support the first light emitting element at a position where light emitted from the first light emitting element is received by the light receiving surface over the entire angle range around the central axis of the first light emitting element corresponding to the irradiation angle of the first light emitting element.

[0067] According to the working machine having feature 19 or feature 21, the loss (or attenuation) of light from the first light emitting element can be suppressed, thereby increasing the brightness of light output from the output surface.

[0068] In a certain embodiment, the working machine may have the following features in addition to or instead of at least any one of the features 1 to 21.

[0069] Feature 22: The support structure is configured to support the first light emitting element at a position where light emitted from the first light emitting element is received by the light receiving surface over the entire angle range of 60 degrees from the central axis of the first light emitting element.

[0070] Therefore, according to the working machine having feature 22, when a popular light emitting element is used as the first light emitting element, the light loss of the first light emitting element can be suppressed, thereby increasing the brightness of the light output from the output surface.

[0071] In a certain embodiment, the working machine may have the following features in addition to or instead of at least any one of the features 1 to 22.

[0072] Feature 23: The support structure is configured to support the second light emitting element at a position where an angle between an imaginary straight line connecting the second light emitting element and the outer edge of the light receiving surface and the first direction is equal to or smaller than a reference angle.

[0073] In a certain embodiment, the working machine may have the following features in addition to or instead of at least any one of the features 1 to 23.

[0074] Feature 24: The reference angle corresponds to half the irradiation angle of the second light emitting element.

[0075] According to the working machine having the feature 23 or the feature 24, the light from the second light emitting element can be transmitted to the outside of the housing through the light receiving surface of the lens.

[0076] In a certain embodiment, the working machine may have the following features in addition to or instead of at least any one of the features 1 to 24.

[0077] Feature 25: The reference angle is 60 degrees.

[0078] According to the working machine having feature 25, when a general-purpose light-emitting element having an irradiation angle of 120 degrees is used as the second light-emitting element, light from the second light-emitting element can pass through the light-receiving surface of the lens and propagate to the outside of the housing.

[0079] In a certain embodiment, the working machine may have at least one of the following features in addition to or instead of at least one of the features 1 to 10.

[0080] Feature 26: The lens has an axisymmetric shape.

[0081] Feature 27: The reference point is the point where the central axis of the lens intersects the imaginary plane.

[0082] According to the working machine having the features 26 and 27, it is possible to effectively guide the light propagating from the light-emitting point so as to spread axially symmetrically to the outside of the casing while suppressing loss.

[0083] In a certain embodiment, the working machine may have at least one of the following features in addition to or instead of at least one of the features 1 to 27.

[0084] Feature 28: The lens has a light receiving surface that receives light from the light emitting element supported by the support structure as a surface facing the inner side of the housing.

[0085] Feature 29: The lens has an output surface for outputting light from the light emitting element supported by the support structure as a surface facing the outside of the housing.

[0086] Feature 30: The lens has a shape in which the area of ​​the output surface is larger than the area of ​​the light receiving surface.

[0087] In a certain embodiment, the working machine may have at least one of the following features in addition to or instead of at least one of the features 1 to 30.

[0088] Feature 31: The lens has a substantially truncated cone shape having a lower base and an upper base having a smaller diameter than the lower base.

[0089] Feature 32: The lens is arranged such that: the lower base faces the outer side of the housing, and the upper base faces the inner side of the housing.

[0090] The light from the light emitting element propagates in a manner that spreads as it moves away from the light emitting point. Therefore, according to the working machine having the features 28 to 30 or the features 31 to 32, the light from the light emitting element can be effectively guided to the outside of the housing while suppressing loss.

[0091] In a certain embodiment, the working machine may have the following features in addition to or instead of at least any one of the features 1 to 32.

[0092] Feature 33: The lens has a shape in which an angle between a side surface of the truncated cone and a central axis of the truncated cone is within a range of 33 degrees to 35 degrees.

[0093] According to the working machine having feature 33, for example, when a general-purpose light-emitting element having an irradiation angle of 120 degrees is used, it is possible to effectively guide light from the light-emitting element to the outside of the housing while suppressing loss.

[0094] In a certain embodiment, the working machine may have at least one of the following features in addition to or instead of at least one of the features 1 to 33.

[0095] Feature 34: The first light emitting element has an irradiation angle of 120 degrees.

[0096] Feature 35: The second light emitting element has an irradiation angle of 120 degrees.

[0097] In a certain embodiment, the working machine may have at least one of the following features in addition to or instead of at least one of the features 1 to 10.

[0098] Feature 36: The first light emitting element is a red LED.

[0099] Feature 37: The second light emitting element is a green LED.

[0100] In a certain embodiment, the working machine may have at least one of the following features in addition to or instead of at least one of the features 1 to 37.

[0101] Feature 38: The first light emitting element is a surface-mounted LED.

[0102] Feature 39: The second light emitting element is a surface-mounted LED.

[0103] In a certain embodiment, the working machine may have at least one of the following features in addition to or instead of at least one of the features 1 to 39.

[0104] Feature 40: The first light emitting element is a surface-mounted red LED.

[0105] Feature 41: The second light emitting element is a surface-mounted green LED.

[0106] In one embodiment, features 1 to 41 may be combined in any way. In one embodiment, any one of features 1 to 41 may be eliminated.

[0107] One embodiment may provide a display. The display may have at least one of the following features.

[0108] Feature 42: The display has a support structure.

[0109] Feature 43: The support structure is configured to be able to support the first light emitting element and the second light emitting element inside the display.

[0110] Feature 44: The support structure can support the first light emitting element and the second light emitting element so as to irradiate light in the first direction.

[0111] Feature 45: The display includes a lens.

[0112] Feature 46: The lens is configured to receive light from a light emitting element supported by a support structure on the inner side of the display.

[0113] Feature 47: The lens is configured to propagate light from a light emitting element supported by a support structure inside the display to the outside of the display.

[0114] Feature 48: The display is configured to display information by lighting up using a lens.

[0115] Feature 49: The support structure is configured to support the first light-emitting element and the second light-emitting element at positions where the first distance and the second distance on an imaginary plane orthogonal to the first direction are different. The first distance is the distance between the reference point and the first light-emitting element. The second distance is the distance between the reference point and the second light-emitting element.

[0116] Feature 50: The reference point is a point where the intensity of light that passes through the lens and propagates to the outside of the display is maximum when light is irradiated toward the first direction from a corresponding point among the points on the virtual plane.

[0117] The display having features 42 to 50 can arrange a plurality of light emitting elements with respect to the lens so that the appearance of the information display is appropriate, similarly to the working machine having features 1 to 10.

[0118] In one embodiment, the display may be assembled in the working machine. In one embodiment, the display may have, in addition to or instead of at least any one of the features 42 to 50, at least any one of the features 11 to 41 of the working machine, or features equivalent thereto. Equivalent features are features that can be understood by replacing "the outside of the housing" with "the outside of the display" and "the inside of the housing" with "the inside of the display".

[0119] [2. Specific exemplary embodiments]

[0120] <2.1. Overall structure>

[0121] Next, the configuration of the working machine 1 according to the present embodiment will be described. Figure 1The working machine 1 of the present embodiment shown includes a control board 10 , a motor 30 , a display 50 , and a battery 70 . The control board 10 , the motor 30 , and the display 50 are configured to operate by power supplied from the battery 70 .

[0122] The control board 10 is configured to control the motor 30 and the display 50. The control board 10 includes a processor 11 and a memory 15. The processor 11 executes processing related to the control of the motor 30 and the display 50 according to a computer program stored in the memory 15. The memory 15 includes, for example, a RAM, a ROM, and an NVRAM.

[0123] The motor 30 is controlled by the control board 10 to drive the working tool. When the working machine 1 is a lawn mower, the working tool is a cutter. When the working machine 1 is a power cutter, the working tool is a disc cutter. The working tool is driven to rotate by the motor 30, for example.

[0124] The display 50 is configured to display the state of the working machine 1 as information. Examples of the state of the working machine 1 include the overload state of the motor 30 and the charge state of the battery 70. One or more displays 50 may be provided in the working machine 1.

[0125] <2.2. Structure of lawn mower>

[0126] Figure 2 2 shows a structure of a lawn mower 101 as an example of the working machine 1. The lawn mower 101 shown in the figure includes a main pipe 110, a driving unit 120, a joystick 140, and a control unit 160.

[0127] The main pipe 110 is formed in a long and hollow rod shape. The driving unit 120 is disposed at the front end side of the main pipe 110. The control unit 160 is disposed at the rear end side of the main pipe 110. The control rod 140 is disposed near the middle of the main pipe 110 in the length direction.

[0128] The drive unit 120 includes a motor housing 121 and a cutter 125. The cutter 125 is detachably mounted to the motor housing 121. A cover 129 is provided at the front end of the main pipe 110 to prevent grass cut by the cutter 125 from flying toward a user of the lawn mower 101.

[0129] A motor 130 is provided inside the motor housing 121 to drive the cutter 125 to rotate. The cutter 125 receives power from the motor 130 and rotates. Figure 1 The motor 30 of the working machine 1 shown corresponds.

[0130] The joystick 140 is formed in a U shape and connected to the main pipe 110. A right handle 141 for the user to hold with the right hand is provided at a first end of the joystick 140, and a left handle 142 for the user to hold with the left hand is provided at a second end of the joystick 140.

[0131] A trigger 143 and a lock release button 145 are provided at the distal end of the right handle 141. A display unit 150 is also provided at the distal end of the right handle 141. The trigger 143 is operated by the user to instruct the cutting knife 125 to rotate.

[0132] The lock release button 145 is a button for preventing or suppressing erroneous operation of the cutting knife 125. When the lock release button 145 is not pressed, the lock release button 145 is mechanically engaged with the trigger 143. Thus, the movement of the trigger 143 is restricted.

[0133] When the lock release button 145 is pressed, the engagement between the lock release button 145 and the trigger 143 is released, thereby allowing the user to operate the trigger 143 .

[0134] The display unit 150 is provided at a position where the user can check the status of the lawn mower 101, and is configured to display information related to the status of the lawn mower 101 to the user. Examples of the information related to the status of the lawn mower 101 include the remaining capacity of the battery 170, the rotation speed of the motor 130, and the operation mode of the motor 130.

[0135] A control wiring tube 149 is provided between the lower end of the right handle 141 and the front end of the control unit 160. A control harness (not shown) is provided inside the control wiring tube 149. The control harness is a harness for electrically connecting the trigger 143 and the display unit 150 to the control unit 160.

[0136] The control unit 160 includes a rear housing 161 and a battery pack 165. A control board (not shown) for controlling the motor 130 and the display unit 150 is accommodated in the rear housing 161. The control board here corresponds to the control board 10 of the working machine 1.

[0137] The battery pack 165 is detachably mounted on the rear end of the rear housing 161. The battery 170 is built into the battery pack 165. The battery 170 is a repeatedly rechargeable power source for supplying DC power to various parts in the rear housing 161 and the motor 130. As an example, the battery 170 includes a lithium ion secondary battery. The battery 170 corresponds to the battery 70 of the working machine 1.

[0138] A speed dial 167 and a main switch 169 are provided at the front end of the rear housing 161 so as to be operable by the user. The speed dial 167 is provided so that the user can variably set the rotation speed of the motor 130. The main switch 169 is a switch that enables the lawn mower 101 to be used by supplying power to each part from the battery 170.

[0139] When the configuration of the working machine 1 of the present embodiment is applied to the lawn mower 101 , the display 50 unique to the present embodiment is mounted in the central housing 151 of the lawn mower 101 that constitutes the outer shape of the display unit 150 .

[0140] like Figure 3 As shown, the central housing 151 has a display surface 155 having a display window 153. Figure 3 as well as Figure 4 As shown, the display window 153 is a circular hole extending from the outside to the inside of the central housing 151. The display 50 is housed in the central housing 151 in such a manner that the lens 51 is disposed in the display window 153.

[0141] Figure 3 : The schematic structure of the periphery of the display surface 155 observed from a position away from the normal direction of the display surface 155 is shown in FIG. Figure 3 In FIG. 1 , the schematic structure of the display 50 disposed inside the central housing 151 is transparently displayed by the dotted line. Figure 4 : The cross-sectional structure of the display 50 on the plane perpendicular to the display surface 155 is shown in FIG. For the sake of simplicity, Figure 3 2 shows an example in which one display 50 is provided in the display unit 150, but a plurality of displays 50 may be provided in the display unit 150. In addition to the display 50 of this embodiment described in detail below, other types of displays may be provided in the display unit 150.

[0142] <2.3. Display configuration>

[0143] like Figure 4 As shown in FIG. 1 , the display 50 of this embodiment includes: a lens 51, a housing 53, and an LED substrate 55. LED is an abbreviation of a light emitting diode. The lens 51 and the housing 53 are integrally molded by transparent resin. Figure 4 In FIG. 5 , a boundary between the lens 51 and the housing 53 is shown by a dotted line. The LED substrate 55 is positioned and arranged inside the housing 53 .

[0144] The housing 53 is a hollow box-shaped housing having an inner surface defining an inner space. The LED substrate 55 is disposed in the inner space. A structure capable of positioning the LED substrate 55 in the inner space is provided inside the housing 53. With this structure, the LED substrate 55 is accommodated inside the housing 53 in a manner positioned relative to the lens 51.

[0145] The LED substrate 55 includes a first LED 57 , a second LED 58 , and a printed substrate 59 configured to be able to mount the first LED 57 and the second LED 58 .

[0146] The printed circuit board 59 is a circuit board having a pad for surface-mounting the first LED 57 at a first position and a pad for surface-mounting the second LED 58 at a second position on the surface. The printed circuit board 59 constitutes a support structure that can support the first LED 57 and the second LED 58 on the inner side of the central housing 151, the inner side of the display 50, and the inner side of the housing 53.

[0147] According to the present embodiment, the first LED 57 is a surface mounted red LED. The second LED 58 is a surface mounted green LED. The first LED 57 is an LED capable of emitting red light with a wavelength of 610 to 780 nm. The second LED 58 is an LED capable of emitting green light with a wavelength of 500 to 570 nm.

[0148] The popular surface-mounted LED is: similar to the case of having an irradiation angle of 120 degrees, the first LED 57 and the second LED 58 of this embodiment also have a surface-mounted LED with an irradiation angle of 120 degrees. The irradiation angle here corresponds to the half-value angle, and corresponds to the angle range in which the intensity of light output from the central axis of the LED is reduced to 50%.

[0149] like Figure 4 As shown, the lens 51 has a light receiving surface 51a as a surface facing the inside of the display 50 and the inside of the housing 53 at the boundary between the lens 51 and the housing 53. The light receiving surface 51a receives light from the first LED 57 and the second LED 58 on the inside of the housing 53. As a surface facing the outside of the display 50 and the outside of the housing 53, the lens 51 has an output surface 51b that outputs the light from the first LED 57 and the second LED 58 toward the outside of the display 50.

[0150] The lens 51 has an axisymmetric shape in which the area of ​​the output surface 51b is larger than the area of ​​the light receiving surface 51a. Figure 5 , Fig. 6A ,as well as Figure 6BAs shown, the lens 51 has a substantially truncated cone shape, and the truncated cone has a lower base and an upper base having a smaller diameter than the lower base.

[0151] The lens 51 is arranged such that the lower base of the truncated cone faces the outside of the display 50 and the housing 53 as the output surface 51b, and the upper base of the truncated cone faces the inside of the display 50 and the housing 53 as the light receiving surface 51a. Figure 4 In the figure, the boundary between the lens 51 and the housing 53 is indicated by a dotted line. The lens 51 has a light receiving surface 51a corresponding to the upper base of the truncated cone at a position facing the internal space of the housing 53. Hereinafter, the direction parallel to the central axis L1 of the lens 51 and from the light receiving surface 51a toward the output surface 51b is described as a first direction.

[0152] like Figure 5 , Fig. 6A ,as well as Figure 6B As shown, the output surface 51b is formed as a non-flat surface that is processed into convex and concave by geometrically setting grooves. This processing is performed to scatter the light that passes through the output surface 51b from the inner side of the lens 51 and propagates to the outer side of the display 50, thereby improving the user's visibility related to lighting.

[0153] The LED substrate 55 is positioned and arranged in the housing 53 of the display 50 in such a manner that the surface on which the first LED 57 and the second LED 58 are surface-mounted on the printed substrate 59 faces the first direction, that is, in such a manner that the normal direction of the printed substrate 59 is parallel to the central axis of the lens 51. Accordingly, the first LED 57 and the second LED 58 mounted on the printed substrate 59 are arranged in the housing 53 in such a manner that the central axes of the first LED 57 and the second LED 58 face the first direction and emit light in the first direction. The first LED 57 and the second LED 58 are arranged on the same plane corresponding to the surface of the printed substrate 59.

[0154] According to the present embodiment, the first LED 57 is disposed at a location P0, which is a first position, where the central axis L1 of the lens 51 intersects the LED substrate 55. The location P0 is a location where the intensity of light that passes through the lens 51 and propagates to the outside of the display 50 and the outside of the central housing 151 is maximum when light is irradiated toward the first direction from a corresponding location among locations on the surface of the LED substrate 55 orthogonal to the first direction.

[0155] In this embodiment, the point where the intensity of light transmitted through the lens 51 and propagated to the outside of the display 50 is maximum when light is irradiated toward the first direction from a corresponding point among points on the imaginary plane A1 perpendicular to the first direction is called a reference point. Point P0 corresponds to the reference point. Figure 4In FIG. 5 , a virtual plane A1 parallel to the surface of the printed circuit board 59 is shown by a two-dot chain line.

[0156] like Figure 7 as well as Figure 8 As shown, the second LED 58 is arranged at a second position on the LED substrate 55 away from the central axis L1 of the lens 51 and the reference point. This arrangement is performed to suppress the propagation rate of light emitted from the second LED 58 more than that of the first LED 57 .

[0157] The propagation rate or light propagation rate mentioned here corresponds to the ratio of the light emitted from the corresponding LED that passes through the lens 51 and propagates to the outside of the display 50 or the central housing 151. By suppressing the propagation rate, the intensity of the light emitted from the second LED 58 that passes through the lens 51 and propagates to the outside of the display 50 and the central housing 151 can be suppressed. The intensity mentioned here can be understood as the intensity per unit area, that is, the brightness. The irradiation of light from the LED mentioned here can also be understood to mean the same as the radiation or emission of light from the LED.

[0158] The reason why the second LED 58 is arranged at a position offset from the central axis L1 of the lens 51 in order to suppress the light propagation rate of the second LED 58 is that the green light with a wavelength of 500 to 570 nm emitted by the second LED 58 has a higher relative visibility than the red light with a wavelength of 610 to 780 nm emitted by the first LED 57 .

[0159] Fig. 9 The figure shows a graph with wavelength as the horizontal axis and relative visibility as the vertical axis. The graph uses a solid line to represent relative visibility in the dark and a dotted line to represent relative visibility in the bright area. Fig. 9 As can be understood, even in the dark and bright places, the relative visibility of the wavelength band of 610-780nm corresponding to red is significantly lower than the relative visibility of the wavelength band of 500-570nm corresponding to green. The relative visibility of the wavelength band of 500-570nm is approximately in the range of 0.323-0.952, while the relative visibility of the wavelength band of 610-780nm is approximately in the range of 0.000015-0.503.

[0160] Therefore, when the intensity of light emitted from the red LED and the green LED is approximately the same, even if the red LED and the green LED are arranged in the same relative position relative to the lens 51, the brightness of the two LEDs perceived by a user who observes the lighting of the red LED and the green LED from the outside of the working machine 1 such as the lawn mower 101 is different between the red LED and the green LED. The user perceives the green light as brighter than the red light.

[0161] The difference in appearance caused by such lighting may cause discomfort to the user and may also affect the visibility of the displayed information. For example, the user may feel that the information displayed in red is difficult to see clearly, while the information displayed in green is dazzling.

[0162] In this embodiment, in order to suppress such user discomfort, the second LED 58 emitting light of a wavelength having a relatively higher visibility than the first LED 57 is arranged at a position deviated from the central axis L1 of the lens 51, thereby intentionally making the light transmission efficiency of the second LED 58 lower than that of the first LED 57.

[0163] The distance D1 by which the second LED 58 deviates from the central axis L1 of the lens 51 is determined in consideration of the difference in relative visibility between the first LED 57 and the second LED 58. When the intensities of the first LED 57 and the second LED 58 are different, the distance D1 is determined in consideration of the difference in intensities.

[0164] However, as described below, the distance D1 has an upper limit. The second LED 58 is arranged on the LED substrate 55 in such a way that the light receiving surface 51a is within an angle range centered on an axis passing through the light emission center C2 of the second LED 58 and parallel to the first direction. The angle range corresponds to the irradiation angle of the second LED 58. When the irradiation angle of the second LED 58 is 120 degrees, Fig.10 As shown, the distance D1 is determined by setting the distance D2 from the light emission center C2 of the second LED 58 in a direction inclined 60 degrees with respect to the first direction to the outer edge of the light receiving surface 51a as the upper limit.

[0165] That is, the LED substrate 55 is constructed so that the second LED 58 can be installed at a position where the angle between the imaginary straight line L2 connecting the light-emitting center C2 of the second LED 58 and the outer edge of the light-receiving surface 51a and the first direction is less than 60 degrees corresponding to half of the irradiation angle serving as the reference angle.

[0166] In addition, the distance Y along the first direction between the light receiving surface 51a and the light emission center C1 of the first LED 57 is determined in such a manner as to satisfy the following conditions. Fig.11 As shown, the distance Y is determined in the following manner: within the angular range centered on an axis passing through the light emission center C1 of the first LED 57 and parallel to the first direction, the light emitted from the first LED 57 is received by the light receiving surface 51a throughout the angular range. The angular range corresponds to the irradiation angle θ1.

[0167] Specifically, the distance Y is determined such that light emitted from the first LED 57 is received by the light receiving surface 51 a throughout the angle range from the central axis of the first LED 57 (coinciding with the central axis L1 of the lens 51 ) to 60 degrees.

[0168] According to this embodiment, the lens 51 is manufactured in such a manner that the angle θ2 of the side surface of the cone relative to the central axis L1 is in the range of 33 degrees to 35 degrees, so that the light from the first LED 57 that enters the light receiving surface 51a at an angle of 60 degrees from the central axis L1 of the lens 51 can move along the side surface of the lens 51 and be efficiently transmitted to the output surface 51b.

[0169] In other words, the lens 51 is manufactured so that the vertex angle of the cone corresponding to the truncated cone is within a range of 66 to 70 degrees. Hereinafter, this vertex angle is referred to as the vertex angle of the lens 51. The vertex angle corresponds to twice the angle θ2.

[0170] When the lens 51 is in the shape of a truncated cone with such an angle, it is possible to suppress the reflection of light in the lens 51 during the process in which the light emitted by the first LED 57 is incident on the light receiving surface 51a within the angle range of the irradiation angle of 120 degrees and propagates to the output surface 51b. Therefore, it is possible to suppress the loss (or attenuation) of light in the lens 51, so that high-intensity light can be output from the output surface 51b of the lens 51.

[0171] Light incident on the light receiving surface 51a at an angle of approximately 60 degrees from the central axis L1 of the lens 51 is refracted by the lens 51 and propagates within the lens 51 at an angle of 33 to 35 degrees relative to the central axis L1 of the lens 51, which roughly corresponds to the angle of the side surface of the lens 51.

[0172] Therefore, if the lens 51 having the above-mentioned shape is used, the reflection of the light incident on the light receiving surface 51a in the lens 51 is suppressed, and the optical path length until it passes through the output surface 51b is suppressed to be shorter. Accordingly, the loss of light is suppressed, and the brightness of the light output from the output surface 51b of the lens 51 is improved. The refractive index n of the lens 51 can be, for example, n=1.6.

[0173] exist Fig. 12A , 12B , 12C and Fig.13A , 13B In the figure, it is shown that when the vertex angle of the lens 51 is set to 40 degrees, 50 degrees, 60 degrees, 70 degrees, and 80 degrees, and light is irradiated in a first direction from a first LED 57 arranged on the central axis L1 of the lens 51 with an irradiation angle of 120 degrees, the brightness distribution of light output from the output surface 51b of the lens 51 is calculated by simulation.

[0174] exist Fig. 12A , 12B , 12C and Fig.13A , 13B In each figure, the image shown on the left is a grayscale representation of the brightness distribution on the output surface 51b of the lens 51. In this image, the higher the brightness, the whiter it appears. In each figure, the histogram shown on the right is a graph that uses a horizontal axis with a ratio and a vertical axis with brightness to represent the brightness distribution of the image shown on the left.

[0175] Fig. 12A The luminance distribution when the vertex angle of the lens 51 is 40 degrees is shown. Fig. 12B The luminance distribution when the vertex angle of the lens 51 is 50 degrees is shown. Fig. 12C The luminance distribution when the vertex angle of the lens 51 is 60 degrees is shown. Fig.13A The luminance distribution when the vertex angle of the lens 51 is 70 degrees is shown. Fig. 13B The luminance distribution when the vertex angle of the lens 51 is 80 degrees is shown.

[0176] As can be understood from these figures, when the vertex angle of the lens 51 is 40 degrees, the output surface 51b is darker overall. When the vertex angles of the lens 51 are 50 degrees and 60 degrees, the brightness is higher overall than when the vertex angle is 40 degrees, but every 70 cd / m 2 When the vertex angle of lens 51 is 70 degrees, the brightness of 70 cd / m 2 Therefore, when the vertex angle is 70 degrees, the overall brightness of the lens 51 felt by the user will be greater than the brightness when the vertex angle is 60 degrees. When the vertex angle of the lens 51 is 80 degrees, every 30 cd / m 2 The proportion of low brightness will increase, thereby reducing the average brightness of the light-emitting part.

[0177] Thus, the simulation results show that whether the vertex angle of the lens 51 is too narrow or too wide, it is not preferable from the perspective of brightness distribution. The simulation also proves that it is preferable to adjust the vertex angle of the lens 51 to a range of 66 degrees to 70 degrees calculated as a theoretically preferred vertex angle, or an angle around it. However, the vertex angle of the lens 51 can also be set to a wide range of 50 degrees to 120 degrees.

[0178] <2.4. Effect>

[0179] According to the above-mentioned embodiment, multiple colors can be lit up by a common lens 51, and the states of multiple working machines 1 can be displayed using one lens 51. Furthermore, by making the parts common, a display unit of a working machine 1 such as a lawn mower 101 that can display a variety of information can be manufactured at low cost. The display 50 of this embodiment also plays a role in miniaturization of the display unit.

[0180] Furthermore, in this embodiment, it is possible to prevent the green light with relatively high visibility from causing the user to feel dizzy, and it is also possible to prevent the red light with relatively low visibility from causing the user to feel dark, and it is possible to arrange the red LED and the green LED in a small area. Therefore, it is possible to form a small display 50 and a display unit 150 with high display capability.

[0181] <2.5. Modifications>

[0182] In the above, the example in which the display 50 is provided in the display unit 150 of the lawn mower 101 is described. However, the display 50 may be provided in the display unit of various working machines 1. The display 50 may be provided in the display unit of various on-site working machines including, for example, a power cutter.

[0183] The display unit can be provided at various locations of the working machine, such as the joystick, the main body, and the driving unit of the working machine 1 or 101. Therefore, the display 50 can be provided in the housing at various locations of the working machine.

[0184] The first LED 57 and the second LED 58 are not limited to the combination of a green LED and a red LED. The idea of ​​intentionally shifting the second LED 58 from the central axis L1 of the lens 51 serves the following purpose: when a plurality of LEDs emitting light of wavelengths and / or intensities with different relative visibility are associated with a common lens 51, the difference in appearance or appearance caused by lighting can be suppressed.

[0185] The above-mentioned configuration of the first LED 57 and the second LED 58 includes the concept of configuring the first LED 57 and the second LED 58 at positions with different distances from the central axis L1 of the lens 51 in a second direction parallel to the imaginary plane A1, wherein the imaginary plane A1 is a plane orthogonal to the central axis L1 of the lens 51.

[0186] The printed circuit board 59 may include a first LED mounting surface M1 and a second LED mounting surface M2 (solder pad) (see Fig.14) so that the first LED 57 and the second LED 58 can be installed at a first position and a second position at different distances from the central axis L1 of the lens 51.

[0187] When the first position is set at a point where the distance from the central axis L1 of the lens 51 is zero, as in the above-described example, the first LED 57 is arranged at the point P0 on the central axis L1 of the lens 51 .

[0188] When the first position is set at a location where the distance from the central axis L1 is not zero, the first LED 57 is arranged at a position away from the central axis L1 of the lens 51. In this case, the first LED 57 and the second LED 58 can be arranged on the LED substrate 55 in such a manner that the difference in appearance or appearance caused by lighting is reduced.

[0189] Consider the case where two LEDs having the same intensity but different output wavelengths are mounted on the LED substrate 55 as the first LED 57 and the second LED 58. In this case, the LED that can emit light of a wavelength with relatively low visibility among the two LEDs can be used as the first LED 57 and mounted on the first LED mounting surface M1 of the printed substrate 59 disposed at a position closer to the central axis L1 of the lens 51, and the LED that can emit light of a wavelength with relatively high visibility among the two LEDs can be used as the second LED 58 and mounted on the second LED mounting surface M2 of the printed substrate 59 disposed at a position farther from the central axis L1 of the lens 51.

[0190] That is, Fig.14 As shown, the first LED 57 that irradiates light of a wavelength with relatively low visibility can be arranged at a position that is a distance D11 away from the center axis L1 (reference point P0) of the lens 51 in the second direction, and the second LED 58 that irradiates light of a wavelength with relatively high visibility can be arranged at a position that is a distance D12 longer than the distance D11 away from the center axis L1 (reference point P0) of the lens 51 in the second direction.

[0191] Such an installation method corresponds to the following situation: the LED among the two LEDs that emits light of a wavelength with relatively low visibility is installed on the first LED installation surface M1 with a relatively high light transmission rate to the output surface 51b, and the LED among the two LEDs that emits light of a wavelength with relatively high visibility is installed on the second LED installation surface M2 with a relatively low light transmission rate to the output surface 51b.

[0192] Similarly, when two LEDs having no or a slight difference in relative visibility but different intensities are arranged on the LED substrate 55, the two LEDs can be arranged on the LED substrate 55 in such a way that the difference in appearance or appearance due to lighting is reduced.

[0193] In this case, the LED with relatively lower irradiation intensity among the two LEDs can be used as the first LED 57 and mounted on the first LED mounting surface M1 of the printed substrate 59 which is set at a position closer to the center axis L1 of the lens 51, and the LED with relatively higher irradiation intensity among the two LEDs can be used as the second LED 58 and mounted on the second LED mounting surface M2 of the printed substrate 59 which is set at a position farther from the center axis L1 of the lens 51.

[0194] Such an installation method corresponds to the following situation: the LED with relatively lower illumination intensity among the two LEDs is installed on the first LED installation surface M1 with relatively higher light transmission rate to the output surface 51b, and the LED with relatively higher illumination intensity among the two LEDs is installed on the second LED installation surface M2 with relatively lower light transmission rate to the output surface 51b.

[0195] In addition, it is possible to consider installing only one of the first LED 57 and the second LED 58 depending on the type of the working machine 1. That is, it is possible to prepare LED substrates 551 and 552 on which only one of the first LED 57 and the second LED 58 is installed depending on the type of the working machine 1, and to arrange them in the internal space of the housing 53 which is a common component of various working machines 1. The lens 51 integrated with the housing 53 and the printed circuit board 59 can also be common components.

[0196] Fig.15A A display 501 of a modified example is shown. The display 501 includes a lens 51, a housing 53, and an LED substrate 551. Fig.15A , the structure of the display 501 is simply shown. In the modified example described below, the parts marked with the same symbols as the display 50 of the above embodiment can be understood to have the same structure as the display 50. That is, the display 501 can be understood to have the same structure as the above display 50 except that the structure of the LED substrate 551 is different.

[0197] Likewise, Fig. 15B A display 502 of a modified example is shown. The display 502 includes a lens 51, a housing 53, and an LED substrate 552. Fig. 15B, the structure of the display 502 is simply shown. The display 502 can be understood to have the same structure as the above-mentioned display 50 except that the structure of the LED substrate 552 is different.

[0198] The LED substrate 551 and the LED substrate 552 include a printed substrate 59 that is the same as the LED substrate 55 , that is, a printed substrate 59 having a first LED mounting surface M1 (solder pad) at a first position and a second LED mounting surface M2 (solder pad) at a second position.

[0199] However, the LED substrate 551 has the first LED 57 on the first LED mounting surface M1 but does not have the second LED 58 on the second LED mounting surface M2. The LED substrate 552 does not have the first LED 57 on the first LED mounting surface M1 but has the second LED 58 on the second LED mounting surface M2.

[0200] Furthermore, the working machine 1 may be provided with a display 503 including an LED substrate 553 in which the LED substrate 551 and the LED substrate 552 are integrated. Fig. 15C The display 503 shown has two lenses 51, a housing 533, and an LED substrate 553. The display 503 is different from the display 50 described above in that the LED substrate 553 has a different structure, two lenses 51, and a housing 533 has a different structure to match them.

[0201] As can be understood from the description of the display 503, the working machine 1 may be provided with a display having two or more lenses 51 arranged in a row or two-dimensionally. The display may be configured to integrate a plurality of the above-mentioned various displays 50, 501, 502, similarly to the display 503.

[0202] <2.6. Others>

[0203] The present invention is not limited to the above-mentioned embodiment, and various forms can be adopted. For example, the technology of the present invention can also be applied to a working machine that drives a motor using an AC power supply. As described above, the technology of the present invention can be applied to various working machines.

[0204] The function of one component in the above-mentioned embodiment may also be distributed to multiple components. The functions of multiple components may also be integrated into one component. A part of the structure of the above-mentioned embodiment may also be omitted. In addition, at least a part of the structure of the above-mentioned embodiment may be added to the structure of other above-mentioned embodiments, or replaced with it. All modes included in the technical ideas determined by the statements recorded in the claims are embodiments of the present invention.

Claims

1. A working machine, characterized in that: The working machine comprises: a housing; a supporting structure configured to support a first light emitting element and a second light emitting element that irradiate light in a first direction on the inner side of the housing; and a lens configured to propagate light from the light emitting element supported by the supporting structure on the inner side of the housing to the outer side of the housing. The operating mechanism is configured to display information by lighting the lens. The support structure is configured to support the first light emitting element and the second light emitting element at positions where the first distance and the second distance are different on an imaginary plane orthogonal to the first direction. The first distance is: the distance between the reference point and the first light-emitting element, The second distance is: the distance between the reference point and the second light emitting element, The reference point is a point where the intensity of light that passes through the lens and propagates to the outside of the housing is maximum when light is irradiated toward the first direction from a corresponding point among the points on the virtual plane.

2. The working machine according to claim 1, characterized in that: The first light emitting element and the second light emitting element are configured to emit light having at least one of a wavelength and an intensity different from each other.

3. The working machine according to claim 1, characterized in that: The second light emitting element is a light emitting element that emits light of a wavelength having a higher relative visibility than the light emitting from the first light emitting element, or light having a higher intensity than the light emitting from the first light emitting element. The support structure is configured to be capable of supporting the first light emitting element and the second light emitting element at a position where the second distance is longer than the first distance.

4. The working machine according to claim 1, characterized in that: The second light emitting element is a light emitting element that emits light of a wavelength having a higher relative visibility than the light emitting from the first light emitting element, or light having a higher intensity than the light emitting from the first light emitting element. The supporting structure is configured to support the first light-emitting element and the second light-emitting element at a position where the light propagation rate of light emitted from the second light-emitting element is lower than the light propagation rate of light emitted from the first light-emitting element, and the light propagation rate is the proportion of light emitted from the light-emitting element that passes through the lens and propagates to the outside of the housing.

5. The working machine according to any one of claims 1 to 4, characterized in that: The support structure is configured to be able to support the first light emitting element and the second light emitting element on the same plane parallel to the imaginary plane.

6. The working machine according to any one of claims 1 to 4, characterized in that: The supporting structure is a circuit substrate on which the first light emitting element and the second light emitting element can be mounted.

7. The working machine according to any one of claims 1 to 6, characterized in that: The support structure is configured to be able to support the first light emitting element at the reference point.

8. The working machine according to any one of claims 1 to 7, characterized in that: The lens has a light receiving surface facing the inner side of the housing and receiving light from the light emitting element supported by the supporting structure. The support structure is configured to support the first light emitting element at a position where light emitted from the first light emitting element is received by the light receiving surface throughout an angular range corresponding to an irradiation angle of the first light emitting element and centered on the central axis of the first light emitting element.

9. The working machine according to any one of claims 1 to 7, characterized in that: The lens has a light receiving surface facing the inner side of the housing and receiving light from the light emitting element supported by the supporting structure. The support structure is configured to support the first light emitting element at a position where light emitted from the first light emitting element is received by the light receiving surface over the entire angle range from the central axis of the first light emitting element to 60 degrees.

10. The working machine according to any one of claims 1 to 7, characterized in that: The lens has a light receiving surface facing the inner side of the housing and receiving light from the light emitting element supported by the supporting structure. The support structure is configured to support the second light emitting element at a position where an angle between an imaginary straight line connecting the second light emitting element and the outer edge of the light receiving surface and the first direction is equal to or smaller than a reference angle.

11. The working machine according to claim 10, characterized in that: The reference angle corresponds to half of an illumination angle of the second light emitting element.

12. The working machine according to claim 10, characterized in that: The reference angle is 60 degrees.

13. The working machine according to any one of claims 1 to 12, characterized in that: The lens has: an axisymmetric shape, The reference point is a point where the central axis of the lens intersects the imaginary plane.

14. The working machine according to any one of claims 1 to 13, characterized in that: The lens has a light receiving surface for receiving light from the light emitting element supported by the support structure as a surface facing the inner side of the housing, The lens has an output surface for outputting light from the light emitting element supported by the support structure as a surface facing the outside of the housing, The lens has a shape in which the area of ​​the output surface is larger than the area of ​​the light receiving surface.

15. The working machine according to any one of claims 1 to 14, characterized in that: The lens has a substantially truncated cone shape having a lower base and an upper base having a smaller diameter than the lower base. The lens is configured such that: the lower base faces the outer side of the housing, and the upper base faces the inner side of the housing.

16. The working machine according to claim 15, characterized in that: The lens has a shape in which an angle formed by a side surface of the truncated cone and a central axis of the truncated cone is in a range of 33 degrees to 35 degrees.

17. The working machine according to any one of claims 1 to 16, characterized in that: The first light emitting element and the second light emitting element have an illumination angle of 120 degrees.

18. The working machine according to any one of claims 1 to 17, characterized in that: The first light emitting element is a red LED.

19. The working machine according to any one of claims 1 to 18, characterized in that: The second light emitting element is a green LED.

20. The working machine according to any one of claims 1 to 19, characterized in that: The first light emitting element is a surface mounted red LED, The second light emitting element is a surface mounted green LED.

21. A display, characterized in that: The display comprises: a support structure configured to support a first light emitting element and a second light emitting element on the inner side of the display for irradiating light in a first direction; and a lens configured to propagate light from the light emitting element supported by the support structure on the inner side of the display to the outer side of the display. The display is configured to display information by lighting the lens. The support structure is configured to support the first light emitting element and the second light emitting element at positions where the first distance and the second distance are different on an imaginary plane orthogonal to the first direction. The first distance is: the distance between the reference point and the first light-emitting element, The second distance is: the distance between the reference point and the second light emitting element, The reference point is a point where the intensity of light that passes through the lens and propagates to the outside of the display is maximum when light is irradiated toward the first direction from a corresponding point among the points on the virtual plane.

Images