JP2005343413A - Head lamp device for motorcycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a head lamp device for a motorcycle with a small and inexpensive composition and capable of quickly/accurately positioning a head lamp to its rotational home position. <P>SOLUTION: The device comprises an emitter 22 for illuminating the front of a car body, a luminous intensity distribution adjusting mechanism 16 for changing an illumination range A of the emitter 22, and a luminous intensity distribution control means 20 for controlling the luminous intensity distribution adjusting mechanism 16 and adjusting the illumination range A. the luminous intensity distribution adjusting mechanism 16 has a driving machine 18 for carrying out rotation, a body 35 to be detected, and a sensor 29 for detecting the body 35 to be detected at the rotational home position. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a motorcycle headlamp device that provides a wide front field of view even during cornering during night driving.

  Since the headlamps of conventional motorcycles are fixed to the vehicle body, when the vehicle body is banked, the optical axis of the headlamps is also tilted accordingly. The light distribution of the headlight to the inside of the direction is reduced, and the field of view ahead of the traveling direction is narrowed.

  That is, when the motorcycle travels straight ahead, the irradiation range (light distribution) A of the headlamp spreads in the left-right direction parallel to the horizontal line H as shown in FIG. For example, as shown in FIG. 7 (b), when the motorcycle changes its direction of travel along the curved lane 50 to the left as indicated by the arrow P, the vehicle body is banked on the left and cornered. Compared to the case where the irradiation range A of the straight line travels straight, it is inclined downward. As a result, the irradiation range A of the headlamp to the inner side of the turning direction where the rider's line of sight faces (the portion B surrounded by a broken-line circle in the same figure), that is, the area to be advanced is reduced, and the visual field ahead of the traveling direction is narrow Become.

Therefore, conventionally, based on the bank angle of the vehicle body detected by the bank angle detection means, the rotation control means controls the driving machine, and units including a lens of the headlamp body and a light emitter such as a bulb are included in those units. There has been proposed a headlamp device that is rotated around the central axis by an angle corresponding to the size of the bank angle in a direction opposite to the banked direction (see, for example, Patent Document 1). In this headlamp device, the light distribution of the headlamp increases inward in the turning direction where the rider's line of sight faces during cornering during night driving, and a wide field of view can be secured.
JP 2001-347777 A

  In the headlamp device, it is necessary to detect the rotation angles of the lens and the light emitter in order to feedback control the lens and the light emitter so as to have a rotation angle corresponding to the bank angle. In the headlamp device of Patent Document 1, the rotation amount or the rotation angle of the drive motor of the rotation drive source of the lens and the light emitter is detected by an encoder, and the rotation angle of the lens and the light emitter is calculated based on the detected rotation angle. doing.

  However, since the absolute angle of the encoder, stepping motor, etc. is unknown, when the electric system is turned on by turning on the ignition switch of the motorcycle, the lens and the light emitter are not mechanically rotated. After the rotation to the position, the rotation is rotated in the opposite direction by a predetermined rotation angle obtained in advance from the limit position, thereby positioning at the rotation origin position. For this reason, an extra operation is involved, so that not only does it take time for the headlamp to be positioned at the origin position, but also a collision sound is generated when the headlamp contacts the limit position and stops rotating. On the other hand, since an angle sensor such as a potentiometer can detect an absolute angle, it has the advantage that it can be positioned at the origin of rotation without performing the extra operation as described above when the ignition switch is turned on, but it is large in size. It is difficult to arrange and expensive.

  The present invention has been made in view of the above-described conventional problems, and is capable of positioning a headlamp quickly and accurately at the origin position of rotation while having a small and inexpensive configuration. Is intended to provide.

  In order to achieve the above object, a motorcycle headlamp device according to the present invention includes a light emitter that irradiates the front of a vehicle body, a light distribution adjusting mechanism that changes an irradiation range of the light emitter by rotation, and the light distribution. A light distribution control unit configured to control the adjustment mechanism to adjust the irradiation range, and the light distribution adjustment mechanism includes a drive unit that performs the rotation, a detection target, and the detection target at the rotation origin position. And a sensor for detecting.

  According to this motorcycle headlamp device, when the sensor does not detect the detected object, the light distribution adjusting mechanism is rotated in either the left or right direction by driving the drive unit so that the sensor is detected. The light distribution adjusting mechanism can be positioned at the origin position of rotation simply by stopping the rotation at the point of time when it is detected. Thereafter, the light distribution control means can control the rotation angle of the light distribution adjustment mechanism based on the relative angle with respect to the rotation origin position. Therefore, in this headlamp device, even when a stepping motor or encoder whose absolute angle is unknown is used as a drive unit, after once rotating the lens and the light emitter to the mechanical limit position of rotation as in the prior art, The light distribution adjustment mechanism can be quickly and accurately positioned at the rotation origin position by using the angle sensor as compared with the case where the origin position is determined by rotating it in the opposite direction by a predetermined rotation angle. Compared to the case, downsizing and cost reduction can be realized.

  In a preferred embodiment of the present invention, the light distribution control means has update means for receiving data from the sensor and updating data indicating the origin position. According to this configuration, when the data indicating the origin position changes due to a mechanical shift or the like, the data indicating the origin position can be updated anew, so that the light distribution adjustment mechanism always has an accurate rotation angle. Can be controlled.

  In a preferred embodiment of the present invention, the light distribution control means includes origin calculation means for calculating the origin position based on detection of both ends in the rotation direction of the detected object. According to this configuration, when the engine is started, the light distribution adjusting mechanism is rotated in either the left or right direction, and the other end is detected from the time when one end of the detected body that rotates integrally with the light distribution adjusting mechanism is detected by the sensor. The angle data indicating the origin position of the rotation of the light distribution adjusting mechanism can be accurately calculated by a simple calculation of obtaining the rotation angle up to and half of the rotation angle. In addition, in this configuration, since it is only necessary to detect both ends of the detected object by the sensor, it is not necessary to use a highly accurate sensor that accurately detects one point on the detected object. Since an on / off type inexpensive device such as a photoelectric sensor may be used, the cost can be reduced. Further, since the detected object can be formed in a relatively wide shape, it is easy to manufacture and the mounting state is stable.

  In a preferred embodiment of the present invention, the driving machine is a stepping motor, and further, step-out detection for detecting step-out of the driving machine based on detection of one end of the rotation direction of the detected object and the origin position. Have means. According to this configuration, since the stepping motor can be accurately controlled to rotate at a rotation angle proportional to the number of input pulses, open-loop positioning control is possible, and a feedback control system is unnecessary, further reducing cost. Can be planned. However, the stepping motor may step out (slip) in response to a pulse input whose number of steps exceeds the range of load torque that can be driven in a one-to-one relationship with the input pulse. On the other hand, this step-out occurs when the operation of returning the light distribution adjustment mechanism to the rotation origin position is performed, and the input of the stepping motor from the time when one end of the detected object is detected to the time when the position returns to the origin position. By comparing the pulse count value with the pulse value as the origin position data calculated in advance by calculation, it is possible to easily and accurately determine whether or not they match. When the occurrence of a step-out is determined, the step-out can be automatically compensated by correcting the deviation of the origin position.

  In a preferred embodiment of the present invention, there is further provided a rotation abnormality detecting means for detecting a rotation abnormality based on the fact that the sensor does not detect the detected object at the origin position. According to this configuration, when the light distribution adjusting mechanism is returned to the rotation origin position by the light distribution control means, it is only necessary to determine whether or not the sensor detects the detected object. The presence or absence of an abnormality can be easily determined.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view showing a motorcycle 1 to which a headlamp device 11 according to an embodiment of the present invention is attached. The motorcycle 1 has a front wheel 5 attached to a front fork 4 pivotally supported by a head pipe 3 at the front end of a body frame 2, and a swing arm 7 pivotally supported by a swing arm bracket 6 at the lower center of the body frame 2. The rear wheel 8 is driven by the engine 9 attached to the wheel 8 and attached to the lower center of the body frame 2, and is steered by the handle 10 fixed to the upper end of the front fork 4.

  A headlamp 12 constituting the headlamp device 11 is attached to the front fork 4 via a bracket 13. The headlamp device 11 includes the headlamp 12 and its rotation control device 15 (FIG. 3). As shown in FIG. 1, an electronic control unit E constituting the main part of the rotation control device 15 is provided. 1 is disposed below the seat 43 at the center of the vehicle body in FIG.

  As shown in FIG. 2A, in the headlamp 12, a lens 23 is disposed opposite to a front surface of a bulb 22 as a light emitter provided in a lamp case 21, and the bulb 22 and the lens 23 are arranged at the center thereof. It is rotatable around the axis C. The lamp case 21 is attached to an annular rim 14 on the front side thereof by a screw body (not shown), and a hook-like reflector 24 arranged so as to surround the bulb 22 is attached to the rim 14 by a fixture (not shown). A lens 23 is rotatably supported on a rotation shaft 26 of a lens column 25 provided on the reflector 24. A rotating base 27 is disposed at the center of the reflector 24 so as to be coaxial with the lens 23. The bulb 22 is disposed on the center of the rotating base 27, that is, on the central axis C, with the light emitter bracket 31. Is attached through.

  The rotary base 27 is rotatably supported by a fixed base 28 on the outer side thereof, and the fixed base 28 is supported by the reflector 24 via a bracket 58. The rotation base 27 and the outer peripheral portion of the lens 23 are connected by an arm 38. Thus, the bulb 22 and the lens 23 are rotatable relative to the lamp case 21, the rim 14, and the retractor 24. A front cover 30 is attached to the front surface of the retractor 24. A power cord 33 is connected to the light emitter socket 37.

  As shown in FIG. 2 (b), a semicircular arc driven gear 32 is provided on the disk-like outer peripheral portion of the rotating base 27 over an angular range of approximately 180 degrees, while FIG. 2 (a). A driving machine 18 for rotating the rotary base 27 is attached to the outer peripheral portion of the fixed base 28. In this embodiment, a stepping motor is used as the driving machine 18. The rotation of the driving machine 18 is transmitted to the rotation base 27 through the circular drive gear 34 and the driven gear 32 that mesh with each other, whereby the lens 23 is rotationally driven together with the valve 22. The reflector 24, the lens column 25, the rotating shaft 26, the rotating base 27, the bulb bracket 31 and the driven gear 32 constitute an irradiation range variable mechanism 17 that changes the irradiation range of the headlamp 12.

Further, a detection body 35 that protrudes outward is integrally formed on the outer peripheral portion of the rotation base 27 at the central portion in the circumferential direction at the unformed portion of the driven gear 32 shown in FIG. On the other hand, an origin sensor 29 for detecting the detected object 35 in a non-contact manner is attached to the fixed base 28 at a predetermined origin position. The detected object 35 is located at the origin position 35 at the center of the detected object 35 when the irradiation range variable mechanism 17 (FIG. 2A) of the headlamp 12 is rotated, that is, when the rotation angle is 0 °. _M is disposed at a position facing the origin sensor 29 in proximity. The origin sensor 29 is an inexpensive on / off type sensor that detects and turns on the detected object 35 when the right end 35 _R or the end 35 _L of the detected object 35 comes close to the opposite sensor, such as a magnetic proximity sensor or photoelectric sensor. A sensor is used. The detected body 35 and the origin sensor 29 together with the drive unit 18 and the irradiation range variable mechanism 17 constitute a light distribution adjustment mechanism 16 that changes the irradiation range of the headlamp 12 by rotation. The power cord or signal cord of the drive unit 18 and the power cord 33 of the bulb 22 are led out from a cord lead-out hole (not shown) provided in the lamp case 21.

  As shown in FIG. 7A, the lens 23 and the bulb 22 have a general irradiation that becomes an irradiation range (light distribution) A that spreads left and right along the horizontal line H as shown in FIG. Have a range. The irradiation range is given, for example, by providing a light adjusting plate for adjusting the light divergence direction on the bulb 22 of FIG. 2 and integrally forming a large number of cylindrical lens elements and Fresnel lens elements on the front surface or rear surface of the lens 23. can do.

  The electronic control unit E shown in FIG. 1 adds a new control means by changing or adding a part of the control program to the one for controlling the electric system conventionally mounted on the motorcycle 1. The rotation control device 15 is configured. That is, as shown in FIG. 3, the electronic control unit E is newly added with the functions of the origin calculation means 39, the update means 40, the step-out detection means 41, the rotation abnormality detection means 44, and the drive control means 42. Thus, the light distribution control means 20 is configured. The drive control means 42 controls the rotation of the drive unit 18 of the light distribution adjusting mechanism 16 based on the bank angle, which will be described later, to rotate the irradiation range variable mechanism 17, and moves the valve 22 and the lens 23 in the direction opposite to the banked direction. It is controlled to rotate by an angle corresponding to the size of.

  The bank angle detection means 19 provided in the rotation control device 15 is a means for detecting the bank angle of the vehicle body of the motorcycle 1 (FIG. 1), that is, the inclination angle in the left-right direction with respect to the vertical line of the vehicle body. The bank angle obtained from the rotational angular velocity around the vertical axis of the vehicle body and the vehicle speed detected by the speedometer 52 is corrected based on the lateral acceleration of the vehicle body detected by the accelerometer 53, and the vehicle bank Calculate the corner. The bank angle detecting means 19 is described in detail in Japanese Patent Application No. 2003-063082 previously proposed by the present applicant.

In addition, as described above, the light distribution control means 20 including the origin calculation means 39, the update means 40, the step-out detection means 41, the rotation abnormality detection means 44, and the drive control means 42 is provided. The driving pulse supplied from the driving control means 42 to the driving machine 18 is added or subtracted according to the sign of the driving pulse to calculate an integrated count value of the driving pulse, and the origin calculated by the origin calculating means 39. a first memory 47A for storing positional data, corresponding to a range from the origin position 35 _M of the detection object 35 shown in FIG. 2 (b) for the step-out detection to be described later to the right end 35 _R or left 35 _L A second memory 47B for storing the number of drive pulses to the drive unit 18 shown in FIG. 3 required for rotation by the rotation angle, and a timer for measuring a predetermined time based on a command from the origin calculation means 39. It is provided with Ma circuit 48.

  Next, the operation of the motorcycle headlamp device 11 will be described with reference to the flowchart of FIG. When the ignition switch is turned on, the control process shown in the flowchart of FIG. 4 is executed, and the irradiation range variable mechanism 17 included in the light distribution adjustment mechanism 16 of FIG. 3 is positioned at the rotation origin position. That is, in this embodiment, since the stepping motor whose absolute angle is unknown is used as the drive unit 18 that is the rotational drive source of the light distribution adjusting mechanism 16, first, the irradiation range variable mechanism 17, and therefore the bulb 22 and A control process for positioning the lens 23 at the rotation origin position is performed, and the stepping motor 18 is controlled to rotate by a required angle corresponding to the bank angle in either the left or right direction with reference to the position.

  The origin calculation means 39 of the light distribution control means 20 monitors whether the ignition switch is turned on (step S1 in FIG. 4), and when it is determined that the ignition switch is turned on, the origin sensor 29 detects the detected object 35. Whether or not the sensor is turned on is determined based on whether or not a detection signal is input from the origin sensor 29 (step S2). In the motorcycle 1, when the vehicle is stopped and the ignition switch is turned off, the headlamp 12 is often located at or near the origin position of rotation and the origin sensor 29 is turned on. In general, the origin sensor 29 is turned on.

  When it is determined that the origin sensor 29 is on, the origin calculation means 39 instructs the drive control means 42 to start control to rotate the drive machine 18 counterclockwise as viewed from the rear (step S3). Thereafter, it is monitored that the origin sensor 29 shifts from the on state to the off state (step S4).

As described above, the rotation base 27 of the irradiation range variable mechanism 17 in FIG. 2A rotates to the left along with the left rotation of the drive unit 18, and the right end of the detected object 35 of the rotation base 27 shown in FIG. When 35 _R deviates from the origin sensor 29 and the origin sensor 29 shifts to the OFF state, the current position P _L (pulse count value counted by the integrated pulse counter 45 in FIG. 3) at that time is detected (step S5). Next, the origin calculation means 39 instructs the drive control means 42 to supply the forward drive pulse and rotate it clockwise after stopping the drive machine 18 (step S6). After the clockwise rotation is started and the origin sensor 29 is turned on again, the left end 35 _L of the detected object 35 in FIG. 2B is detached from the origin sensor 29 and the origin sensor 29 is turned off. the monitor (step S7), and when it is determined that the transition to the oFF state of the origin sensor 29 detects the current position P _R (pulse count value) at that time (step S8), and the drive control unit 42 On the other hand, a command is given to stop the rotation of the driving machine 18 (step S9). Both the count numbers P _L and P _R are the number of pulses from the previous origin position stored in the first memory 47A.

The origin calculation means 39 performs the simple calculation of dividing the sum of the pulse count values of the current positions P _L and P _R obtained in steps S5 and S8 by 2, thereby indicating the origin indicating the rotation origin position of the headlamp 12. Position data is calculated (step S10). Next, the updating unit 40 registers the calculated origin position data by writing it in the first memory 47A (step S11).

As described above, since the origin sensor 29 only needs to detect the left and right ends 35 _L and 35 _R of the detected object 35, a high-precision sensor that accurately detects one point on the detected object is used. There is no need, and an inexpensive on / off type such as a magnetic proximity sensor or a photoelectric sensor is sufficient. Thereby, in this headlamp device 11, production cost can be reduced.

  On the other hand, if it is determined that the origin sensor 29 is off in step S2 of FIG. 4 because the position of the detected object 35 is greatly deviated from the vicinity of the origin, the origin sensor 29 of FIG. 3 is once turned on. Control is performed. That is, the origin calculation means 39 instructs the timer circuit 48 to measure a predetermined time at the same time as rotating the drive unit 18 counterclockwise (step S13), and determines whether the origin sensor 29 is turned on (step S14). It is determined whether or not the timer circuit 48 has timed out after a predetermined time has elapsed, that is, whether or not the timer circuit 48 has rotated too much (step S15). When the origin sensor 29 is turned on, the process returns to step S2 and the same control process as described above is executed.

  On the other hand, if it is determined that the time is over, it is assumed that the detected object 35 does not exist on the left rotation side, and the drive control means 42 is instructed to change the rotation of the drive unit 18 to the right rotation (step) S16) When it is determined that the origin sensor 29 has shifted to the ON state (step S17), the process returns to step S2 and the same control process as described above is executed. Thereby, when the origin sensor 29 is turned on, it is possible to prevent the irradiation range variable mechanism 17 from being rotated too much in the rotation direction opposite to the origin position, and the origin sensor 29 can be quickly turned on.

  When the origin position of the irradiation range variable mechanism 17 is obtained as described above, the drive control means 42 of the light distribution control means 20 sets the irradiation range variable mechanism 17 to the origin position when the vehicle travels straight without banking. A drive pulse is output so as to return, and the drive unit 18 is controlled to rotate. When the vehicle body is banked, the drive control means 42 outputs a number of drive pulses based on the bank angle input from the bank angle detection means 19 to control the rotation of the drive unit 18 of the light distribution adjusting mechanism 16, and the banked direction The irradiation range variable mechanism 17 is rotated in the opposite direction by an angle corresponding to the size of the bank angle, and the bulb 22 and the lens 23 are controlled to rotate by the same angle. When returning the irradiation range variable mechanism 17 to the origin position, a positive (for forward rotation) or negative (for reverse rotation) drive pulse is supplied to the drive unit 18 until the pulse count value of the integrated pulse counter 45 reaches the count value of the origin position. .

  Thus, when the light distribution control means 20 controls the rotation of the bulb 22 and the lens 23 according to the bank angle, for example, when the motorcycle 1 (FIG. 1) traveling at night corners to the left side, The lens 23 and the bulb 22 are rotated in the opposite direction to the banking direction of the vehicle body, and the irradiation range (light distribution) A is rotated in the opposite direction by an angle slightly larger than the bank angle. At this time, when the amount of rotation of the drive machine 18 reaches a value corresponding to the bank angle, the drive control means 42 stops the drive machine 18 in response to this. Thereby, the irradiation range A rotates in the direction opposite to the banked direction by an angle corresponding to the size of the vehicle body bank angle.

  Accordingly, when the motorcycle 1 changes its traveling direction to the left side indicated by the arrow P along the curved lane 50 as shown in FIG. 6, for example, the irradiation range A of the headlamp device 11 is as shown in FIG. From the state extending left and right along the horizontal line H at the time of straight traveling, the state is slightly inclined to the left as shown in FIG. As a result, the light distribution to the inside of the turning direction where the rider's line of sight faces (portion B surrounded by a broken-line circle in the figure) is much larger than that in the conventional example shown in FIG. Becomes wider. Depending on the shape of the irradiation range A, the irradiation range A is rotated by an angle corresponding to the size of the vehicle body bank angle in the same direction, not the opposite direction to the banked direction, and the inside of the turning direction in which the rider's line of sight faces It may increase the light distribution.

  Since the stepping motor used as the driving machine 18 in FIG. 3 can accurately control rotation at a rotation angle proportional to the number of input pulses, open-loop positioning control is possible, and a feedback control system is not required. The production cost can be reduced with the simplification. On the other hand, the stepping motor may step out in response to a pulse input whose number of steps exceeds the range of load torque that can be driven in a one-to-one relationship with the input pulse. Therefore, in this headlamp device 11, whether or not the step-out has occurred is monitored by the step-out detection means 41 provided in the light distribution control means 20.

  Next, a control process for detecting whether or not a step-out has occurred will be described with reference to the flowchart of FIG. The flowchart in FIG. 5 shows a flow of a series of control processes for detecting whether or not a step-out has occurred, automatically correcting the step-out, and detecting a rotation abnormality such as a motor rotation stoppage. The control executed by the step-out detection means 41, the drive control means 42, and the rotation abnormality detection means 44 is also shown.

  For example, after the irradiation range variable mechanism 17 is rotated during turning traveling, the irradiation range variable mechanism 17 starts to be rotated toward the origin by the drive unit 18 (step S21 in FIG. 5). The rotation of the drive unit 18 toward the origin position can be detected by determining that the number of drive pulses approaches the pulse count value at the origin position.

The step-out detecting means 41 detects that the origin sensor 29 detects the right end 35 _R or the left end 35 _L of the detected body 35 in FIG. 2B when the driving machine 18 rotates toward the origin position. The transition from the off state to the on state is monitored (step S22), and when it is determined that the origin sensor 29 is transitioning to the on state, the pulse count value of the integrated pulse counter 45 at that time is extracted. in determining the current position P _E (step S23). Subsequently, the step-out detection means 41 starts a process of counting the number of drive pulses supplied by the drive control means 42 to the drive unit 18 from the time when it is determined that the shift to the ON state is made (step). S24).

On the other hand, the drive control means 42 monitors whether or not the count value of the integrated pulse counter 45 has reached the pulse count value of the origin position obtained in step S10 in FIG. 4 (step S25), and determines that the origin position has been reached. time at stops outputting of the drive pulse rotating to stop the drive motor 18 (step S26), the synchronization failure detector 41 stops the counting operation of the driving pulse, for detecting the current position P _O at that time ( Step S27). In the second memory 47B, ½ of the difference in the number of pulses at both ends 35 _R and 35 _{L of the} detected object 35 is stored in advance as a set value, and the step-out detection means 41 is set from the second memory 47B. The number of pulses (count value) indicating the value (difference) is read, and the read set value (pulse value) matches the number of drive pulses supplied | P _E −P _O | Is determined (step S28). If they match, it is determined that no step-out has occurred, and the series of control processing ends.

On the other hand, if they do not match, the step-out detection means 41 determines that a step-out has occurred, and the origin calculation means 39 determines the origin position by the difference between | P _E −P _O | and the set value. A command is given to correct the data (step S29). Thereby, even if a step-out occurs, this can be detected and automatically corrected.

  On the other hand, when the rotation abnormality detecting means 44 is monitoring the transition from the OFF state to the ON state of the origin sensor 29 in step S22, has the pulse count value of the integrated pulse counter 45 become the count value of the origin position? (Step S31), and when it is determined that the count value of the integrated pulse counter 45 has reached the count value of the origin position before the origin sensor 29 shifts to the ON state, a warning lamp (not shown) is turned on. Lights up and warns the rider that a rotation abnormality such as a rotation stop has occurred in the headlamp device 11 (step S32).

  In the above-described embodiment, the case where a stepping motor is used as the drive unit 18 has been described as an example. However, the present invention is also applicable to a configuration in which a DC motor is used as the drive unit and the rotation angle of the DC motor is detected by an encoder. Can do. In the above-described embodiment, the bulb 22 and the lens 23 are integrally rotated by the irradiation range variable mechanism 17. However, only one of the bulb 22 and the lens 23 may be rotated, for example, the reflector 24. If the light distribution is provided, only the reflector 24 may be rotated.

1 is a side view of a motorcycle equipped with a headlamp device according to an embodiment of the present invention. It is a longitudinal cross-sectional view of the headlamp in a headlamp apparatus same as the above. It is a block diagram which shows schematic structure of a headlamp apparatus same as the above. It is a flowchart which shows the control processing which positions to the origin position of rotation in a headlamp apparatus same as the above. It is a flowchart which shows the control processing which detects a step-out and rotation abnormality in a headlamp apparatus same as the above. It is a front visual recognition figure which shows the irradiation range at the time of the cornering of the headlamp which concerns on this invention. (A) is a front view showing the irradiation range of the headlamp when the motorcycle travels straight, and (b) is a front view showing the irradiation range during cornering of the conventional headlamp.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motorcycle 11 Headlamp apparatus 12 Headlamp 16 Light distribution adjustment mechanism 17 Irradiation range variable mechanism 18 Drive device 20 Light distribution control means 22 Bulb (light-emitting body)
29 Origin sensor (sensor)
35 Detected object 35 _M Origin position of the detected object 35 _R Right end of the detected object 35 _L Right end of the detected object 39 Origin calculation means 41 Step-out detection means 40 Update means 44 Rotation abnormality detection means A Irradiation range

Claims (5)

A light emitter that illuminates the front of the vehicle body;
A light distribution adjustment mechanism for changing the irradiation range by the light emitter by rotation;
A light distribution control means for controlling the light distribution adjustment mechanism to adjust the irradiation range,
The light distribution adjusting mechanism is a headlamp device for a motorcycle having a drive unit that performs the rotation, a detection target, and a sensor that detects the detection target at the origin position of the rotation. The motorcycle headlamp device according to claim 1, wherein the light distribution control unit includes an update unit that receives a signal from the sensor and updates data indicating the origin position. 3. The motorcycle headlamp device according to claim 1, wherein the light distribution control means includes origin calculation means for calculating the origin position based on detection of both ends of the rotation direction of the detected object. 4. The stepping motor according to claim 3, further comprising step-out detection means for detecting step-out of the driving unit based on detection of one end of the rotation direction of the detected object and the origin position. A motorcycle headlamp device. The motorcycle headlamp according to any one of claims 1 to 4, further comprising a rotation abnormality detecting means for detecting a rotation abnormality based on the fact that the sensor does not detect the detected object at the origin position. apparatus.

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