Turn signal indicator for two-wheeled vehicles

Abstract

To suppress a change in a light distribution condition of a turn signal indicator derived from a posture change of a two-wheeled vehicle.SOLUTION: A turn signal indicator for two-wheeled vehicles to be attached to a handlebar of a two-wheeled vehicle includes a lamp unit whose light distribution is variable, and a controller that is connected to the lamp unit and controls the lamp unit so as to, when the posture of the two-wheeled vehicle has changed, correct an irradiation range of light of the lamp unit.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a turn signal for a motorcycle. [Background technology]

[0002] Japanese Patent Application Laid-Open Publication No. 2017-147066 (Patent Document 1) describes a turn lamp (directional indicator) attached to the door mirror of a vehicle. This turn lamp has multiple light sources and can freely set the lighting pattern.

[0003] However, when considering applying the above-mentioned turn signal lamps to a motorcycle, the light distribution state of the turn signal lamps changes relatively greatly due to changes in vehicle posture specific to motorcycles (for example, changes due to the steering angle of the handlebars or the inclination of the vehicle itself), which may cause discomfort to the motorcycle driver and passengers in nearby vehicles. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2017-147066 A Summary of the Invention [Problem to be solved by the invention]

[0005] One object of a specific aspect of the present disclosure is to provide a light distribution control technique that can suppress changes in the light distribution state of a turn signal caused by changes in the posture of a two-wheeled vehicle. [Means for solving the problem]

[0006] A direction indicator for a motorcycle according to one aspect of the present disclosure includes: A motorcycle turn signal attached to a handlebar of a motorcycle, A variable light distribution lamp unit, a controller connected to the lamp unit and configured to control the lamp unit so as to correct an illumination range of the light from the lamp unit when a posture of the two-wheeled vehicle changes; A turn signal for a motorcycle, comprising:

[0007] According to the above configuration, a light distribution control technique is provided that can suppress changes in the light distribution state of the direction indicator caused by changes in the posture of the two-wheeled vehicle. [Brief description of the drawings]

[0008] [Figure 1] Fig. 1A is a diagram showing a configuration of a direction indicator for a motorcycle according to an embodiment, and Fig. 1B is a diagram showing a configuration example of a computer system. [Diagram 2] 2(A) to 2(C) are diagrams for explaining the outline of the operation of the direction indicator for a motorcycle of this embodiment. [Diagram 3] 3(A) to 3(C) are diagrams for explaining examples of the configuration of a lamp unit capable of correcting the light irradiation range. [Figure 4] FIG. 4 is a diagram showing an example of installation of the lamp unit. [Diagram 5] Fig. 5(A) is a diagram for explaining a coordinate system for the rotation angle of the handlebars, and Fig. 5(B) is a diagram for explaining a coordinate system for the bank angle of the vehicle body. [Figure 6] FIG. 6 is a flowchart showing the operation procedure of a direction indicator for a motorcycle. [Figure 7] FIG. 7 is a diagram for explaining the reference optical axis used for correcting the irradiation range of light. [Figure 8] Fig. 8(A) is a diagram for explaining a change in the reference optical axis accompanying a change in steering angle, and Fig. 8(B) is a diagram for explaining a change in the reference optical axis accompanying a change in bank angle. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] 1(A) is a diagram showing the configuration of a motorcycle direction indicator according to one embodiment. The illustrated motorcycle direction indicator includes a controller 10, a steering angle sensor 11, a bank angle sensor 12, and a pair of lamp units 13L, 13R. The motorcycle direction indicator according to this embodiment is mounted on a motorcycle and used to irradiate the surroundings of the motorcycle with light to indicate the traveling direction of the motorcycle.

[0010] The controller 10 controls the operations of the lamp units 13L and 13R. The controller 10 can be configured using a computer system such as that shown in Fig. 1(B), that is, a computer system including a processor (CPU: Central Processing Unit) 201, a ROM (Read Only Memory) 202, a RAM (Random Access Memory) 203, a storage device 204 such as a flash memory, an input / output interface 205, and the like.

[0011] The controller 10 of the present embodiment is capable of performing each function described below by the processor reading and executing a program 206 previously stored in a storage device 204. The controller 10 includes an irradiation range correction unit (irradiation range correction function) 20 and a control signal generation unit (control signal generation function) 21 as functions realized by the execution of the program.

[0012] The steering angle sensor 11 detects the steering angle of the handle of a motorcycle on which the motorcycle direction indicator of this embodiment is mounted. This steering angle sensor 11 is attached, for example, to a shaft that is linked to the handle. If the motorcycle is originally equipped with a steering angle sensor, it can be used as the steering angle sensor 11 in the motorcycle direction indicator of this embodiment.

[0013] The bank angle sensor 12 detects the bank angle (inclination angle) of the body of the motorcycle on which the motorcycle direction indicator of this embodiment is mounted. This bank angle sensor 12 is attached, for example, at an appropriate position on the motorcycle body. If the motorcycle is originally equipped with a bank angle sensor, it can be substituted for the bank angle sensor 12 in the motorcycle direction indicator of this embodiment. The bank angle sensor 12 can be, for example, an acceleration sensor, a height sensor, a gyro sensor, or the like.

[0014] The lamp units 13L, 13R are attached to predetermined positions on the left and right sides of the handlebars of the motorcycle, and emit light under the control of the controller 10 in response to the operation of a switch (not shown).

[0015] The illumination range correction unit 20 performs processing to correct the illumination range (illumination direction) of the light emitted by each lamp unit 13L, 13R based on the steering angle of the steering wheel detected by the steering angle sensor 11 and the bank angle of the vehicle body detected by the bank angle sensor 12.

[0016] The control signal generating unit 21 generates a control signal for controlling the lighting state of each of the lamp units 13L, 13R, and outputs it to each of the lamp units 13L, 13R. For example, the control signal generating unit 21 generates a control signal to light (or blink) one of the lamp units 13L, 13R in response to the operation of a direction indicator switch (not shown). In addition, the control signal generating unit 21 generates a control signal to correct the light irradiation range of each of the lamp units 13L, 13R based on a correction value obtained by the irradiation range correcting unit 20.

[0017] 2(A) to 2(C) are diagrams for explaining the outline of the operation of the motorcycle direction indicator of this embodiment. Each diagram shows a schematic plan view of a motorcycle 100 mounted with the motorcycle direction indicator of this embodiment, as seen from above. Note that, although a right turn is illustrated here, the same applies when turning left. As shown in each diagram, in this embodiment, the left-right direction (horizontal direction) of the motorcycle is defined as the X-axis, the front-rear direction as the Y-axis, and the up-down direction (vertical direction) as the Z-axis.

[0018] The motorcycle direction indicator is attached, for example, to the handlebar 101 of the motorcycle 100. In detail, at least the lamp units 13L, 13R are attached to the left and right sides of the handlebar 101. The motorcycle direction indicator (particularly the lamp units 13L, 13R) may be attached, for example, directly to the handlebar 101, or indirectly by being built into a rearview mirror attached to the handlebar 101 as shown in Fig. 4, which will be described later.

[0019] As shown in FIG. 2(A), when a turn signal switch (not shown) is operated, for example, when turning right, light 110 is emitted to the right side of the motorcycle from lamp unit 13R of the motorcycle turn signal installed on the right side of handlebar 101. The emitted light 101 is emitted, for example, by flashing at a constant cycle. At this time, light 110 is emitted, for example, so as to spread in a fan shape close to a semicircle from the installation position of the motorcycle turn signal in a plan view. In detail, light 110 is emitted in an approximately semicircular shape including light directed forward, sideways, and backward of the motorcycle.

[0020] When the handlebars 101 of a motorcycle in a straight-ahead position are turned in the right direction by the rider, the position of the lamp unit 13R of the motorcycle turn signal also changes, and the illumination range of the light 110 emitted from the lamp unit 13R also changes, as shown in Fig. 2(B). At this time, the motorcycle turn signal of this embodiment corrects the illumination range of the light 110 so that it is the same as or close to the illumination range of the light 110 in the straight-ahead position before the handlebars 101 were turned, as shown in Fig. 2(C).

[0021] Although the change in the illumination range of the light 110 accompanying the rotation of the handlebar 101 has been exemplified here, the illumination range of the light 110 may also change due to a change in posture of the motorcycle body when turning right or left (i.e., a change in bank angle). In this case as well, the motorcycle direction indicator of this embodiment corrects the illumination range of the light 110 so that it is the same as or close to the illumination range of the light 110 when the vehicle body was in a straight-ahead posture before the posture change.

[0022] 3(A) to 3(C) are diagrams for explaining a configuration example of a lamp unit (lamp unit with variable light distribution) capable of correcting the irradiation range of light. The lamp unit 13L (or 13R) of the configuration example shown in FIG. 3(A) is configured to include a light source 50 that emits light, and a movable reflector 51 that reflects the light emitted from the light source 50. The movable reflector 51 is configured so that the orientation of the reflecting surface can be adjusted using an actuator (not shown) or the like. This makes it possible to correct the irradiation range of the light reflected by the movable reflector 51 and traveling to the outside.

[0023] The lamp unit 13L (or 13R) of the configuration example shown in FIG. 3(B) includes a light source 50 that emits light and a reflector 52 that reflects the light emitted from the light source 50. The reflector 52 is configured, for example, so that the inner reflecting surface is curved. The relative positional relationship between the reflector 52 and the light source 50 is fixed. The light emitted from the light source 50 mainly travels directly to the outside of the reflector 52, and a part of the light is reflected by the inner reflecting surface of the reflector 52 and travels to the outside. The light source 50 and the reflector 52 are configured so that their postures can be adjusted using an actuator (not shown) or the like. This makes it possible to correct the irradiation range of the light traveling from the inside of the reflector 52 to the outside.

[0024] The lamp unit 13L (or 13R) of the configuration example shown in Fig. 3(C) is configured to include a light source 50 that emits light, and a light deflector 53 that reflects and scans the light emitted from the light source. The light deflector 53 is equipped with, for example, a minute mirror, and is configured to be able to scan the incident light toward the outside by rotating this mirror. This makes it possible to correct the irradiation range of the light traveling from the light deflector 53 to the outside.

[0025] As lamp unit 13L (or 13R), in addition to the configurations described above, various lamp units with variable light distribution can be used, such as a lamp unit configured to control the transmission state of light from a light source using a liquid crystal element, or a lamp unit having multiple light-emitting elements arranged in a matrix and capable of turning each light-emitting element on and off individually.

[0026] FIG. 4 is a diagram showing an example of the installation of the lamp unit. Here, a schematic plan view of a rearview mirror 102 seen from above is shown. The lamp unit 13L (or 13R) can be configured to be built into the rearview mirror 102 provided on the handlebars of a motorcycle, for example. The illustrated rearview mirror 102 is provided on each of the left and right sides of the handlebars of the motorcycle, and includes a mirror portion 103 for visually checking the rear, and a lamp portion 104 provided on a side end of the rearview mirror 102 and incorporating the lamp unit 13L (or 13R). The lamp portion 104 incorporates the lamp unit 13L (or 13R) inside, and includes a cover portion configured using a translucent member that can transmit light emitted from the lamp unit 13L (or 13R).

[0027] Fig. 5(A) is a diagram for explaining the coordinate system of the rotation angle of the handlebar. As shown in Fig. 2(A) and other figures, the left-right direction (horizontal direction) of the motorcycle is the X-axis, and the front-rear direction is the Y-axis. The reference position of the handlebar of the motorcycle, that is, the reference position when the handlebar is not rotated either left or right, is assumed to coincide with the X-axis. When the handlebar is rotated, the steering angle θ1 is determined with the X-axis as the reference, with a clockwise direction being a positive value and a counterclockwise direction being a negative value.

[0028] In the illustrated example, the steering angle θ1 when turning right is shown, and in this case the steering angle θ1 is a positive value. Although not illustrated, the steering angle θ1 when turning left is a negative value. When the steering wheel is turned, the illumination range of the light 110 (see FIG. 2(A) etc.) from the lamp unit 13L (or 13R) is basically corrected so as to offset the change in the illumination range due to the steering angle θ1. However, since it may be difficult to completely offset the change, a correction is made so as to approach the illumination range before the steering wheel was turned.

[0029] Fig. 5(B) is a diagram for explaining the coordinate system of the bank angle of the vehicle body. As shown in Fig. 2(A) and other figures, the left-right direction (horizontal direction) of the motorcycle is the X-axis, and the up-down direction is the Z-axis. The reference position of the motorcycle body, that is, the reference position when the body is not tilted to either the left or right, is assumed to coincide with the Z-axis. When the body is tilted, the bank angle θ2 is determined with the Z-axis as the reference, with the clockwise direction being a positive value and the counterclockwise direction being a negative value.

[0030] In the illustrated example, the bank angle θ2 when turning right is shown, and the steering angle θ2 in this case is a positive value. Although not illustrated, the bank angle θ2 when turning left is a negative value. When the vehicle body tilts, the illumination range of the light 110 (see FIG. 2(A) etc.) from the lamp unit 13L (or 13R) is basically corrected so as to offset the change in the illumination range due to the bank angle θ2. However, since it may be difficult to completely offset the change, a correction is made so as to approach the illumination range before the vehicle body tilted.

[0031] Fig. 6 is a flow chart showing the operation procedure of a motorcycle turn signal. Note that the order of the processes shown here can be changed as long as no contradiction or inconsistency occurs in the results of the information processing, and other processes not specifically shown here can be added.

[0032] When rotation of the handlebars is detected based on the steering angle of the two-wheeled vehicle detected by the steering angle sensor 11 (step S11; YES), the irradiation range correction unit 20 of the controller 10 acquires the steering angle θ1 from the steering angle sensor 11 (step S12).

[0033] Here, it is desirable to detect the rotation of the steering wheel when the steering angle θ1 exceeds a predetermined threshold (for example, 0.5° in absolute value). If the light irradiation range is frequently corrected in response to slight changes in the steering wheel when driving straight, this increases power consumption and affects the durability of the device, so by setting a threshold, such inconveniences can be avoided.

[0034] When the rotation of the steering wheel is not detected (step S11; NO), the illumination range correction unit 20 sets the steering angle θ1 to 0° and proceeds to step S13.

[0035] When tilt of the body is detected based on the bank angle of the motorcycle body detected by the bank angle sensor 12 (step S13; YES), the illumination range correction unit 20 acquires the bank angle θ2 from the bank angle sensor 12 (step S14).

[0036] Here, it is desirable to detect the inclination of the vehicle body when the bank angle θ2 exceeds a predetermined threshold value (for example, 2.0° in absolute value). If the light irradiation range is frequently corrected in response to slight changes in the vehicle body when traveling straight, this increases power consumption and affects the durability of the device, so by setting a threshold value, such inconveniences can be avoided.

[0037] If the inclination of the vehicle body is not detected (step S13; NO), the illumination range correction unit 20 sets the bank angle θ2 to 0° and proceeds to step S15.

[0038] The illumination range correction unit 20 calculates a correction value for correcting the illumination range of the light from the lamp unit 13L (or 13R) based on the steering angle θ1 and bank angle θ2 acquired from each sensor or set (step S15). It should be noted that which of the lamp units 13L and 13R is to be corrected can be determined based on the positive or negative value of the steering angle θ1 or bank angle θ2 (see FIG. 5(A) and FIG. 5(B)).

[0039] The control signal generating unit 21 uses the correction value calculated by the irradiation range correcting unit 20 to generate a control signal for controlling the irradiation range of the light by the lamp unit 13L (or 13R), and outputs it to the lamp unit 13L (or 13R) (step S16). After that, the process returns to step S11.

[0040] FIG. 7 is a diagram for explaining the reference optical axis used for correcting the light irradiation range. FIG. 7 shows a schematic plan view of the motorcycle 100 as seen from above. As described above, in this embodiment, the lamp units 13L and 13R are installed at predetermined positions on the left and right sides of the handlebar 101. In this embodiment, in order to distinguish between the lights irradiated by the lamp units 13L and 13R, they are written as lights 110L and 110R, respectively. The light 110L is light irradiated from the lamp unit 13L on the left side of the motorcycle from the front to the rear of the motorcycle. The light 110R is light irradiated from the lamp unit 13R on the right side of the motorcycle from the front to the rear of the motorcycle.

[0041] When the motorcycle is in a straight-ahead position, i.e., when the steering angle θ1 of the handlebars is 0 and the bank angle θ2 of the vehicle body is 0, the optical axis indicating the center of the light flux of light 110R and parallel to the X direction perpendicular to the traveling direction of the motorcycle (i.e., the Y direction) is set as the reference optical axis C1 of light 110R in this embodiment. Similarly, when the motorcycle is in a straight-ahead position, the optical axis indicating the center of the light flux of light 110L and parallel to the X direction perpendicular to the traveling direction of the motorcycle is set as the reference optical axis C2 of light 110L in this embodiment.

[0042] Fig. 8(A) is a diagram for explaining the change in the reference optical axis with the change in steering angle. Note that only the reference optical axis C1 will be described in detail here, but the same applies to the reference optical axis C2. As shown in the figure, when the steering angle θ1 of the steering wheel changes, the reference optical axis C1 also changes accordingly. The change in the reference optical axis C1 at this time is taken as φ1. In principle, this change φ1 coincides with the steering angle θ1.

[0043] Therefore, simply, by offsetting the change amount φ1 using a correction value equivalent to the value obtained by inverting the positive and negative of the steering angle θ1, the irradiation range of the light 110L can be corrected to be the same as when the motorcycle is in a straight-ahead posture. Specifically, by providing the lamp unit 13L with a correction value that offsets the change amount φ1, for example, in the configuration example shown in Fig. 3(A), the reflection direction of the light by the movable reflector 51 can be controlled, and the irradiation range of the light 110L can be corrected. The same applies to the configuration examples shown in Fig. 3(B) and Fig. 3(C).

[0044] In reality, errors may occur due to the structure of the lamp unit 13L, the mounting position, and other conditions, so in order to adjust for these errors, it is preferable to set a correction value by adding or subtracting a preset adjustment value α1 to or from the positive / negative inverted value of the steering angle θ1. Note that no correction value is set when the steering angle θ1 is 0.

[0045] FIG. 8(B) is a diagram for explaining the change in the reference optical axis with the change in bank angle. Note that here, only the reference optical axis C1 will be described in detail, but the same applies to the reference optical axis C2. As shown in the figure, when the bank angle θ2 of the vehicle body changes, the reference optical axis C1 also changes accordingly. The change in the reference optical axis C1 at this time is taken as φ2. In principle, this change φ2 coincides with the bank angle θ2.

[0046] Therefore, simply, by offsetting the change φ2 using a correction value equivalent to the value obtained by inverting the positive and negative of the bank angle θ2, the irradiation range of the light 110L can be corrected to be the same as when the motorcycle is in a straight-ahead posture. Specifically, by providing the lamp unit 13L with a correction value that offsets the change φ2, for example, in the configuration example shown in Fig. 3(A), the reflection direction of the light by the movable reflector 51 can be controlled, and the irradiation range of the light 110L can be corrected. The same applies to the configuration examples shown in Fig. 3(B) and Fig. 3(C).

[0047] In reality, there may be errors due to the structure and mounting position of the lamp unit 13L, so in order to adjust for these errors, it is preferable to set a correction value by adding or subtracting a preset adjustment value α2 to or from the positive / negative inverted value of the bank angle θ2. Note that no correction value is set when the bank angle θ2 is 0.

[0048] According to the embodiment as described above, it is possible to suppress changes in the light distribution state of the direction indicator caused by changes in the posture of the two-wheeled vehicle.

[0049] The present disclosure is not limited to the contents of the above-mentioned embodiment, and various modifications can be made within the scope of the gist of the present disclosure. For example, in the above-mentioned embodiment, the light irradiation range is corrected using both the steering angle and the bank angle, but the light irradiation range may be corrected using only either the steering angle or the bank angle. In addition, in the above-mentioned embodiment, a configuration in which a motorcycle direction indicator (particularly a lamp unit) is built into a rearview mirror attached to a handlebar of a motorcycle is exemplified, but the configuration is not limited to this. For example, the motorcycle direction indicator of the present disclosure may be applied to a direction indicator provided separately from the rearview mirror. In addition, the motorcycle direction indicator in this case may be a direction indicator that is installed as an auxiliary separately from the direction indicator originally provided on the motorcycle. In other words, the motorcycle direction indicator according to the present disclosure may be directly attached to the handlebar, or may be indirectly attached by a method such as being built into the rearview mirror. In addition, a camera having an image processing function may be used as the steering angle sensor or the bank angle sensor. In this case, the steering angle and bank angle can be obtained by detecting a change in the relative positional relationship between a specific object and the two-wheeled vehicle based on an image obtained by the camera.

[0050] The present disclosure has the following features. (Appendix 1) A motorcycle turn signal attached to a handlebar of a motorcycle, A lamp unit with variable light distribution; a controller connected to the lamp unit and configured to control the lamp unit so as to correct an illumination range of the light from the lamp unit when a posture of the two-wheeled vehicle changes; 4. A turn signal for a motorcycle, comprising: (Appendix 2) The change in the attitude of the motorcycle is a change in the steering angle of the handlebars and / or a change in the bank angle of the motorcycle. 2. A direction indicator for a motorcycle as described in paragraph 1. (Appendix 3) The controller controls the lamp unit so as to offset a change in the illumination range of the light caused by a change in the steering angle. 2. A direction indicator for a motorcycle as described in paragraph 2. (Appendix 4) the controller controls the lamp unit so as to cancel a change in the direction of the reference optical axis of the light caused by a change in the steering angle from a predetermined reference. 4. A direction indicator for a motorcycle as described in appendix 2 or 3. (Appendix 5) The controller corrects the direction of the reference optical axis by using a value corresponding to a change in the steering angle from a predetermined reference. 5. A direction indicator for a motorcycle as described in paragraph 4. (Appendix 6) the controller corrects the direction of the reference optical axis by using a value obtained by adding or subtracting a predetermined adjustment value to an angle corresponding to a change in the steering angle from a predetermined reference. 5. A direction indicator for a motorcycle as described in paragraph 4. (Appendix 7) the controller controls the lamp unit so as to offset a change in the light irradiation range caused by a change in the bank angle. 2. A direction indicator for a motorcycle as described in paragraph 2. (Appendix 8) the controller controls the lamp unit so as to cancel a change in the direction of the reference optical axis of the light caused by a change in the bank angle from a predetermined reference. 8. A motorcycle indicator as claimed in claim 2 or 7. (Appendix 9) the controller corrects the direction of the reference optical axis by using a value corresponding to a change in the bank angle from a predetermined reference. 9. A motorcycle indicator as defined in claim 8. (Appendix 10) the controller corrects the direction of the reference optical axis by using a value obtained by adding or subtracting a predetermined adjustment value to an angle corresponding to a change in the bank angle from a predetermined reference. 9. A motorcycle indicator as defined in claim 8. (Appendix 11) At least the lamp unit is attached directly or indirectly to the handle; A direction indicator for a motorcycle according to any one of appendixes 1 to 10. (Appendix 12) A sensor for detecting a change in the attitude of the motorcycle. 12. A direction indicator for a motorcycle according to any one of appendices 1 to 11. [Explanation of symbols]

[0051] 10: controller, 11: steering angle sensor, 12: bank angle sensor, 13L, 13R: lamp unit, 20: irradiation range correction unit, 21: control signal generation unit, 100: motorcycle, 101: handle, 110: light

Claims

1. A motorcycle turn signal attached to a handlebar of a motorcycle, A lamp unit with variable light distribution; a controller connected to the lamp unit and configured to control the lamp unit so as to correct an illumination range of the light from the lamp unit when a posture of the two-wheeled vehicle changes; 4. A turn signal for a motorcycle, comprising:

2. The change in the attitude of the motorcycle is a change in the steering angle of the handlebars and / or a change in the bank angle of the motorcycle.

2. A direction indicator for a motorcycle according to claim 1.

3. The controller controls the lamp unit so as to offset a change in the illumination range of the light caused by a change in the steering angle.

3. A direction indicator for a motorcycle according to claim 2.

4. the controller controls the lamp unit so as to cancel a change in the direction of the reference optical axis of the light caused by a change in the steering angle from a predetermined reference.

3. A direction indicator for a motorcycle according to claim 2.

5. The controller corrects the direction of the reference optical axis by using a value corresponding to a change in the steering angle from a predetermined reference.

5. A direction indicator for a motorcycle according to claim 4.

6. the controller corrects the direction of the reference optical axis by using a value obtained by adding or subtracting a predetermined adjustment value to an angle corresponding to a change in the steering angle from a predetermined reference.

5. A direction indicator for a motorcycle according to claim 4.

7. the controller controls the lamp unit so as to offset a change in the light irradiation range caused by a change in the bank angle.

3. A direction indicator for a motorcycle according to claim 2.

8. the controller controls the lamp unit so as to cancel a change in the direction of the reference optical axis of the light caused by a change in the bank angle from a predetermined reference.

3. A direction indicator for a motorcycle according to claim 2.

9. the controller corrects the direction of the reference optical axis by using a value corresponding to a change in the bank angle from a predetermined reference.

9. A direction indicator for a motorcycle according to claim 8.

10. the controller corrects the direction of the reference optical axis by using a value obtained by adding or subtracting a predetermined adjustment value to an angle corresponding to a change in the bank angle from a predetermined reference.

9. A direction indicator for a motorcycle according to claim 8.

11. At least the lamp unit is attached directly or indirectly to the handle; 2. A direction indicator for a motorcycle according to claim 1.

12. A sensor for detecting a change in the attitude of the motorcycle.

2. A direction indicator for a motorcycle according to claim 1.

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