JP6569328B2 - Optical scanning device and in-vehicle system - Google Patents

Description

  The present invention relates to an optical scanning device and the like.

  There is one block body with three reflecting surfaces formed at the tip and two light sources that irradiate light beams at different positions on the reflecting surface. By rotating the block body, two light beams are emitted by these light beams. An optical scanning device that scans a scanning region is known (see Patent Document 1).

Japanese Patent Laying-Open No. 2015-7578

  According to the optical scanning device of Patent Document 1, since the irradiation range of the light beam is expanded, the range for measuring the position of the object can be expanded, but there is a possibility that a measurement result with sufficient accuracy may not be obtained, Effective measurements may not be possible.

  An object of the present invention is to more effectively perform measurement of an object performed by irradiating light.

  One aspect of the present invention is to irradiate outgoing light toward a measurement region by changing an irradiation unit that emits outgoing light and a direction of outgoing light emitted from the irradiation unit over a predetermined measurement range. A scanning unit, and a measurement unit that measures an object existing in the measurement area based on reflected light that is reflected light that has been reflected from the outside. The present invention relates to an optical scanning device characterized by emitting emitted light at a higher frequency.

  According to such a configuration, the emitted light is more focused on the central portion of the measurement range than on other portions. For this reason, it is possible to measure the object existing in the region extending in the central portion with high accuracy while suppressing the measurement range from being narrowed, and more effectively measure the object.

  Further, according to one aspect of the present invention, the irradiation unit irradiates a plurality of outgoing lights and is included in the measurement range, and a range determined individually corresponding to each outgoing light is set as a scanning range, and the measurement range In the central portion, the scanning ranges of the plurality of outgoing lights overlap, and the scanning unit irradiates the outgoing lights toward the measurement region by changing the directions of the outgoing lights over the corresponding scanning ranges. In addition, the present invention relates to an optical scanning device characterized in that emitted light is emitted more frequently at the central portion than at other portions.

  According to such a configuration, since the scanning range of the plurality of outgoing lights overlaps in the central part of the measurement range, the outgoing light is irradiated more heavily in the central part than in the other parts. For this reason, it is possible to measure the object existing in the region extending in the central portion with high accuracy while suppressing the measurement range from being narrowed, and more effectively measure the object.

  One aspect of the present invention is an in-vehicle system including an optical scanning device that detects an object existing around the host vehicle and an in-vehicle device that performs processing based on the object detected by the optical scanning device, The optical scanning device includes an irradiation unit that irradiates the emitted light, and a scanning unit that irradiates the emitted light toward the measurement region by changing the direction of the emitted light emitted from the irradiation unit over a predetermined measurement range. And a measurement unit that measures an object existing in the measurement region based on the reflected light (5) that is the outgoing light reflected from the outside, and the scanning unit has another part for the central part of the measurement range. The present invention relates to an in-vehicle system characterized by emitting emitted light at a higher frequency than the above.

  According to such a configuration, it is possible to perform measurement with high accuracy for an object existing in a region extending in the central portion while suppressing the measurement range from being narrowed. For this reason, it can measure more effectively by arranging the central part of the measurement range at a position where it is desirable to measure an object with high accuracy (for example, in front of the host vehicle).

  In addition, the code | symbol in the parenthesis described in the claim shows the correspondence with the specific means as described in embodiment mentioned later as one aspect, Comprising: The technical scope of this invention is limited is not.

It is a front view of an optical scanning device. It is a top view of an optical scanning device. It is sectional drawing at the time of seeing an optical scanning device from the side. It is explanatory drawing of the polygon mirror seen from the bottom part side. It is a timing chart which shows the irradiation time etc. of the emitted light from A and B laser diode to each reflective surface. It is explanatory drawing of the polygon mirror seen from the bottom part side in other embodiment.

Embodiments to which the present invention is applied will be described below with reference to the drawings.
[Configuration]
The optical scanning device 1 of the present embodiment irradiates two laser beams (emitted light 4) from the emission window 2 to the outside, and detects the reflected light 5 that is the emitted light 4 reflected outside, and detects the detection result. Is configured as a distance measuring device that measures the distance, positional relationship, relative speed, and the like between the object and the device itself (FIGS. 1 to 3). The optical scanning device 1 scans the space (measurement region) in front of its own device by displacing the direction (irradiation direction) of the emitted light 4 output from the emission window 2 over the measurement range 3 (FIG. 5). 2).

  The optical scanning device 1 includes a single polygon mirror 10, a mirror unit 20, a light receiving lens 50, a light receiving element 60, a signal processing device 70, and a distance measurement calculation device 80, two A and B emission lenses 30 and 31, And A and B laser diodes 40 and 41 (FIG. 3).

  The polygon mirror 10 is a polyhedron made of glass or the like, and has an upper surface formed in a circular shape. The polygon mirror 10 is configured to be rotatable in a horizontal direction around a rotation axis extending in the vertical direction by a motor (not shown). The rotation shaft is arranged so as to penetrate the center of the circular upper surface. The polygon mirror 10 is provided on the ceiling side of the housing of the optical scanning device 1, and four A to D reflecting surfaces 12 to 15 are formed on the outer surface on the bottom 11 side. Each of the A to D reflecting surfaces 12 to 15 is inclined at different angles with respect to the rotation axis, and spreads in a trapezoidal shape from the side surface to the bottom portion 11 (FIG. 4).

The A and B laser diodes 40 and 41 irradiate laser beams (emitted light 4) toward the reflecting surface of the polygon mirror 10, respectively.
The A and B emission lenses 30 and 31 are provided corresponding to the respective laser diodes, and convert the laser light emitted from the corresponding laser diodes into parallel light and guide it to the reflection surface of the polygon mirror 10. It is configured as a lens.

The mirror unit 20 transmits the laser light that has passed through the A and B emission lenses 30 and 31 and reflects the reflected light 5 reflected by the polygon mirror 10 toward the light receiving element 60.
The light receiving lens 50 converges the reflected light 5 reflected by the mirror unit 20 and guides it to the light receiving element 60.

  The light receiving element 60 is configured as an avalanche photo diode auto (APD) that generates a voltage (light reception signal) corresponding to the intensity of the reflected light 5 received by photoelectric conversion and outputs the voltage to the signal processing device 70.

  The signal processing device 70 generates data for measuring a distance, a positional relationship, a relative speed, and the like between the object and the own apparatus based on the light reception signal input from the light receiving element 60, and sends the data to the distance measurement calculation device 80. provide.

  The ranging calculation device 80 is configured as a microcontroller, FPGA, or the like, and performs ranging calculation for calculating the distance between the object and the device itself based on the data acquired from the signal processing device 70. In addition, the distance measuring device 80 controls the irradiation of the laser light by the A and B laser diodes 40 and 41 and sets the amplification factor of photoelectric conversion in the light receiving element 60.

[About operation]
In the optical scanning device 1, the A and B laser diodes 40 and 41 irradiate laser light (emitted light 4) toward the reflection surface of the polygon mirror 10. Hereinafter, the emitted light 4 from the A laser diode 40 is referred to as A emitted light, and the emitted light 4 from the B laser diode 41 is referred to as B emitted light.

  The A and B outgoing lights are irradiated to different reflection positions on the reflection surface, reflected at the respective reflection positions, and irradiated to the outside from the emission window 2. Further, the orientations of the A and B laser diodes 40 and 41 are fixed, and the irradiation direction of the A and B emitted light is measured by the polygon mirror 10 rotating in a predetermined rotation direction 10a around the rotation axis. Displacement within range 3 (FIG. 4). The irradiation direction is displaced in the direction opposite to the rotation direction 10a of the polygon mirror 10.

  The polygon mirror 10 is formed with four reflecting surfaces (A to D reflecting surfaces 12 to 15) along the circumferential direction, and the center angle of each reflecting surface spreading in a fan shape is 90 °. The center angle of the reflecting surface is, in other words, an angle formed when these boundary lines intersect when extending each boundary line between two adjacent reflecting surfaces.

  When the polygon mirror 10 rotates in the rotation direction 10a, the reflection positions of the A and B outgoing light move on the reflection surface while drawing an arc along the circumference, and the reflection surface where the reflection position exists is the A reflection surface 12 , B reflection surface 13, C reflection surface 14, D reflection surface 15, A reflection surface 12... While the reflection position is located on one of the reflection surfaces, the irradiation direction is continuously displaced in the direction opposite to the rotation direction 10a as the polygon mirror 10 rotates, and the reflection position moves to the adjacent reflection surface. The irradiation direction moves in the rotation direction 10a and is continuously displaced again in the direction opposite to the irradiation direction.

  In addition, the optical scanning device 1 is configured to avoid the A and B emitted light from being reflected in the vicinity of the boundary line between adjacent reflecting surfaces in order to improve the measurement accuracy. That is, the distance measuring device 80 stops the irradiation by the laser diode corresponding to the reflection position at the timing (stop period) when the reflection position is located in the region near the boundary line. On the other hand, at the timing (irradiation period) at which the reflection position is another region (region separated from the boundary line by a predetermined distance) becomes the reflection position, the emitted light 4 is emitted from the laser diode corresponding to the reflection position. The distance measuring device 80 repeatedly irradiates the emitted light 4 from the laser diode at an irradiation interval (for example, about several μs to several tens μs) during the irradiation period.

  By determining the irradiation period and the stop period in this way, when the polygon mirror 10 is rotating, the irradiation directions of the A and B outgoing lights reflected by the respective reflecting surfaces are the irradiation periods corresponding to the reflecting surfaces. Displace continuously over 50 °. That is, in each irradiation period, the angle (scanning range 40a, 41a) at which the irradiation direction of the emitted light A and B is continuously displaced from the initial position to the end position is 50 °.

  Then, when the reflection surface where the reflection position of the outgoing light 4 is formed is switched and the irradiation period corresponding to the new reflection surface is started, the irradiation direction of the outgoing light 4 is switched to the initial position. Irradiation direction is displaced.

  In addition, the reflection positions of the emitted lights A and B are arranged in a state where a predetermined distance (distance between light sources) is separated along a direction orthogonal to the rotation axis of the polygon mirror 10 (hereinafter simply referred to as a horizontal direction). It is out. In the present embodiment, the distance between the light sources is shortened (the two reflection positions are close to each other), and accordingly, the portion on the initial position side of the scanning range 40a of the A outgoing light 4 and the scanning range of the B outgoing light. The portion on the end position side of 41a overlaps. This overlapping portion is located at the central portion in the measurement range 3, and the angle of this overlapping portion is 30 °. In other words, in the present embodiment, the distance between the light sources is adjusted so that the angle of the overlapping portion is 30 °.

  In other words, the scanning range of the A and B outgoing light is 50 °, and the angle of the overlapping portion of each scanning range is 30 °. By scanning the corresponding scanning range with each outgoing light, 70 ° The entire measurement range 3 is scanned (FIG. 4).

  Then, the reflective surfaces for reflecting the A and B outgoing light are switched in the order of the A reflective surface 12 to the D reflective surface 15, the A reflective surface 12,..., And each laser diode has an irradiation period corresponding to the reflective surface where the reflection occurs. The emitted light 4 is irradiated over the entire area (FIG. 5).

  Specifically, the irradiation period of the A laser diode 40 first arrives for each reflecting surface, and the A emission light is irradiated to the reflecting surface. Then, when the irradiation direction of the A outgoing light is displaced over 20 °, the irradiation period of the B laser diode 41 comes, and the B outgoing light is irradiated onto the reflecting surface. From this point of time, the A and B emission lights are simultaneously irradiated to the outside.

  Thereafter, when the irradiation directions of the A and B outgoing lights are displaced by 30 °, the irradiation period of the A outgoing lights ends, and the irradiation of the A outgoing lights is stopped. After that, when the irradiation direction of the B emission light is displaced over 20 °, the irradiation period of the B emission light ends, and the irradiation of the B emission light is stopped.

In the same manner, irradiation with the A and B emission light is performed in a state where the next reflection surface is switched.
As described above, the distance measuring device 80 irradiates the emitted light from the laser diode with an irradiation interval of, for example, about several μs to several tens of μs in the irradiation period of the emitted light. A period during which the emitted light is continuously irradiated in one irradiation of the emitted light (continuous irradiation period) is shorter than the irradiation period (for example, about several ns to several tens ns).

  Here, the distance measurement calculation device 80 may irradiate the A and B emitted lights from the A and B laser diodes 40 and 41 at the same time when the irradiation periods of the emitted lights overlap each other. In other words, you may make it the continuous irradiation period of each emitted light overlap. By doing so, the power of the emitted light emitted from the optical scanning device 1 can be doubled, and scanning can be performed to a longer distance.

  Further, as described above, the inclination angle of each reflecting surface with respect to the rotation axis is different. More specifically, the inclination with respect to the rotation axis increases in the order of A to D reflecting surfaces 12 to 15. For this reason, every time the reflecting surface is switched, the vertical inclination of the emitted light 4 is displaced, and thereby the scanning of the measurement range 3 is performed while the vertical angle is displaced in four stages. Therefore, the optical scanning device 1 can three-dimensionally scan the area extending in front of the emission window 2.

  Note that the optical scanning device 1 may be mounted on a vehicle and various processes may be performed based on the measurement results obtained by the optical scanning device 1. Specifically, the in-vehicle system is configured by the optical scanning device 1 and the in-vehicle device, and the distance between the vehicle and other objects such as other vehicles, pedestrians, and obstacles existing around the vehicle by the optical scanning device 1. Alternatively, the positional relationship and relative speed may be measured.

  And the vehicle-mounted system may perform driving assistance based on the measurement result by the optical scanning device 1, for example. Specifically, in order to avoid that the own vehicle collides with an object or deviates from the lane, a warning may be given to the driver, or the behavior (vehicle speed, traveling direction, etc.) of the own vehicle may be controlled. Also good. In particular, the behavior of the host vehicle may be controlled in order to detect an object or the like located in the blind spot of the driver and notify the driver of the presence of such an object or to avoid a collision with such an object.

  Further, for example, automatic operation may be performed based on the measurement result. Specifically, a preceding vehicle traveling in front of the host vehicle may be detected, and the host vehicle may be driven following the preceding vehicle based on the detection result, or a lane may be detected and along the lane based on the detection result. The host vehicle may be driven.

  In addition to this, for example, various warnings and behavior control of the own vehicle may be performed to avoid a collision with another vehicle or a pedestrian when traveling at an intersection based on the measurement result of the optical scanning device 1. good. Moreover, when parking the own vehicle, various messages and warnings for assisting the driver may be output, or the behavior of the own vehicle may be controlled.

Of course, the use of the optical scanning device 1 is not limited to in-vehicle use, and can be used for various purposes.
[effect]
According to the optical scanning device 1 of the present embodiment, the following effects can be obtained.

  (1) Since the scanning ranges of the A and B outgoing lights overlap in the central part of the measurement range 3, the outgoing light is irradiated more preferentially than other parts in the measurement range 3 (in other words, The emitted light is irradiated more frequently than the other parts). For this reason, while suppressing the measurement range 3 from being narrowed, it is possible to measure the object existing in the region extending in the central portion with high accuracy, and more effectively measure the object.

  Therefore, in an in-vehicle system or the like equipped with the optical scanning device 1, the central portion of the measurement range 3 is disposed at a position where it is desirable to measure an object with high accuracy (for example, in front of the host vehicle). Measurement can be performed more effectively.

  (2) The optical scanning device 1 is provided with two laser diodes, and the irradiation timing of the emitted light by these is adjusted by a single distance measuring device 80. Further, the emitted light of A and B emitted from these laser diodes is irradiated on the outside by changing the course by the common reflecting surface. For this reason, it is possible to accurately synchronize the irradiation timing of each outgoing light and the timing of changing the irradiation direction. This makes it possible to accurately adjust the timing at which each emitted light is applied to the overlapping portion of the scanning range, and as a result, it is possible to accurately measure the object in the overlapping portion.

In addition, since a common reflecting surface and mirror unit 20 are provided corresponding to each laser diode, the number of parts can be reduced, and downsizing and cost reduction are possible.
(3) Further, the optical scanning device 1 is provided with a single polygon mirror 10, and each reflecting surface formed on the polygon mirror 10 is used in common with respect to the A and B emitted light, and the polygon By rotating the mirror 10, the irradiation directions of the A and B outgoing lights are controlled. For this reason, it is possible to accurately synchronize the timing of changing the irradiation direction of each outgoing light, and thus the timing at which each outgoing light is applied to the overlapping portion of the scanning range can be adjusted accurately, so that the object in the overlapping portion can be adjusted. Can be accurately measured.

Further, since the common polygon mirror 10 is provided corresponding to each laser diode, the number of parts can be reduced, and the size and cost can be reduced.
(4) Since the common light receiving lens 50 and the light receiving element 60 for detecting the reflected light 5 based on each outgoing light are provided, the number of parts can be reduced, and the size and cost can be reduced. Become.

[Other Embodiments]
As mentioned above, although embodiment of this invention was described, this invention can take a various form, without being limited to the said embodiment.

(1) In the present embodiment, four reflecting surfaces are formed on the polygon mirror 10, but the present invention is not limited to this, and three or less, or five or more reflecting surfaces may be formed.
Further, in place of the polygon mirror 10, a mirror unit having one or a plurality of plate-like reflecting surfaces that are rotated about a rotation axis extending in the vertical direction and inclined with respect to the rotation axis is provided. Similarly to the form, scanning may be performed by irradiating the reflecting surface with laser light and rotating the mirror portion.

  Further, the reflection positions of the A and B outgoing lights on one reflection surface are arranged close to each other along the horizontal direction, but this is not limiting, and these reflection positions are separated by a predetermined distance along the horizontal direction. It may be arranged in a state (in other words, in a state where it is not arranged in the direction of the rotation axis on the reflecting surface).

  Even in these cases, by adjusting the horizontal distance (horizontal distance) of each reflection position on one reflecting surface so as not to exceed the upper limit value, the scanning range of the A and B emitted light can be set within the measurement range. Can be overlapped in the middle part. In addition, the overlapping part can be increased more by reducing the horizontal distance. Thereby, similarly, it is possible to improve the measurement accuracy of the region extending to the central portion in the measurement range.

  (2) In this embodiment, two light sources (A and B laser diodes 40 and 41) are used. However, the present invention is not limited to this, and three or more light sources are used, and each reflection position of the emitted light 4 from these light sources on one reflecting surface is separated by a predetermined distance along the horizontal direction (in other words, These reflection positions may be arranged in a state where the reflection positions are not aligned in the direction of the rotation axis on the reflection surface. Even in such a case, by adjusting the horizontal distance between the adjacent reflection positions so as not to exceed the upper limit value, it is possible to overlap the scanning range of each emitted light at the central portion in the measurement range.

  As a specific example, in the optical scanning device 1 of this embodiment, three light sources (A to C laser diodes) are provided, and an irradiation period and a stop period so that the scanning range of each emitted light from each light source is 50 °. In addition, the reflection positions of the emitted lights may be arranged in the horizontal direction (FIG. 6).

  Then, the horizontal distance of each reflection position is adjusted so that the half on the end position side of the scanning range 41a of the central outgoing light overlaps the half on the initial position side of the scanning range 40a of one outgoing light and The half on the initial position side of the scanning range 41a of the emitted light may overlap with the half on the end position side of the scanning range 42a of the other emitted light.

  Thereby, the entire scanning range of the central outgoing light overlaps the scanning range of each outgoing light located at both ends. As a result, the scanning ranges of the two outgoing lights can be overlapped at the central portion in the measurement range 3, and the measurement accuracy of the region extending in the central portion of the measurement range 3 can be improved.

  (3) The optical scanning device 1 of the present embodiment rotates the polygon mirror 10 about the rotation axis extending in the vertical direction, thereby displacing the emitted light from each laser diode in the horizontal direction, and extending over the measurement range 3. It is the structure which scans. In the central portion of the measurement range 3, a portion that is scanned by each emitted light is provided.

  However, the present invention is not limited to this. For example, the direction of the rotation axis of the polygon mirror 10 may be changed to a direction different from the horizontal direction by changing the direction of the rotation axis to a direction different from the vertical direction. Then, scanning may be performed over the measurement range in the same manner as in the present embodiment, and a portion that is scanned by each emitted light may be provided in the central portion of the measurement range. Even if it has such a structure, the same effect can be acquired.

  (4) The optical scanning device 1 of the present embodiment has a reflective surface that is commonly used for the A and B laser diodes 40 and 41, and the direction of the reflective surface is displaced, so that each laser diode is The configuration is such that the emitted light is irradiated over the corresponding scanning range.

  However, the present invention is not limited to this, and by providing a reflecting surface individually corresponding to each laser diode and individually displacing the direction of each reflecting surface, the emitted light 4 is irradiated over a scanning range corresponding to each laser diode, The scanning may be performed in duplicate in the center portion of the measurement range 3. Even in such a case, it is possible to measure the object existing in the region extending in the central portion with high accuracy, and to measure the object more effectively.

  (5) The functions of one component in the above embodiment may be distributed as a plurality of components, or the functions of a plurality of components may be integrated into one component. Further, at least a part of the configuration of the above embodiment may be replaced with a known configuration having the same function. Moreover, you may abbreviate | omit a part of structure of the said embodiment. In addition, at least a part of the configuration of the above embodiment may be added to or replaced with the configuration of the other embodiment. In addition, all the aspects included in the technical idea specified only by the wording described in the claim are embodiment of this invention.

  (6) In addition to the optical scanning device 1 described above, a system including the optical scanning device 1 as a component, a program for causing a computer to function as the optical scanning device 1, a medium on which the program is recorded, and the optical scanning device 1 The present invention can also be realized in various forms such as a measurement method.

[Correspondence with Claims]
The correspondence between the terms used in the description of the above embodiment and the terms used in the description of the claims is shown.

  The polygon mirror 10 corresponds to an example of a scanning unit, and the A exit lens 30, the B exit lens 31, the A laser diode 40, and the B laser diode 41 correspond to an example of an irradiation unit, and a light receiving lens 50, a light receiving element 60, and a signal. The processing device 70 and the distance measurement calculation device 80 correspond to an example of a measurement unit, and the A laser diode 40 and the B laser diode 41 correspond to an example of a light source.

  DESCRIPTION OF SYMBOLS 1 ... Optical scanning device, 2 ... Output window, 3 ... Measurement range, 4 ... Output light, 10 ... Polygon mirror, 12 ... A reflective surface, 13 ... B reflective surface, 14 ... C reflective surface, 15 ... D reflective surface, DESCRIPTION OF SYMBOLS 20 ... Mirror part, 30 ... A exit lens, 31 ... B exit lens, 40 ... A laser diode, 41 ... B laser diode, 40a ... Scan range, 41a ... Scan range, 42a ... Scan range, 50 ... Light receiving lens, 60 ... Light receiving element, 70... Signal processing device, 80.

Claims (8)

An irradiation unit (30, 31, 40, 41) for irradiating a plurality of outgoing lights (4) from a plurality of light sources (40, 41);
A scanning unit (10) for irradiating the emitted light toward the measurement region by changing the direction of the emitted light emitted from the irradiation unit over a predetermined measurement range (3);
A measurement unit (50, 60, 70, 80) for measuring an object existing in the measurement area based on the reflected light (5) that is the emitted light reflected outside;
The scanning range (40a, 41a, 42a) is a range that is included in the measurement range and is individually determined corresponding to each of the emitted light,
The central portion within that put on the measurement range, the scanning range of the plurality of the emitted light are overlapped,
The scanning unit is
The plurality of emitted lights are emitted from the irradiation unit to a plurality of positions arranged at a predetermined distance in a direction orthogonal to the rotation axis. Reflective surface (12-15)
By rotating the reflecting surface around the rotation axis, the direction of each emitted light is changed over the corresponding scanning range, thereby irradiating the emitted light toward the measurement region, and For the central part, radiate the emitted light more frequently than other parts ,
The irradiation unit irradiates the reflection surface with the emitted light in an overlapping period in which the reflection surface is in a direction in which the plurality of the emitted light can be reflected toward the central portion;
An optical scanning device (1) characterized by the above. The optical scanning device according to claim 1,
As the state of the emitted light in the irradiation period in which the emitted light is irradiated from the irradiation unit, an ON state in which the emitted light is output and an OFF state in which the output of the emitted light is temporarily stopped Provided,
The irradiation unit repeatedly switches the state of the emitted light during the irradiation period of the emitted light from each of the light sources, and simultaneously outputs the plurality of emitted lights irradiated on the reflecting surface during the overlapping period. To be in the ON state,
An optical scanning device characterized by the above. The optical scanning device according to claim 1 or 2 ,
The scanning unit is
Having a single polygon mirror (10) that rotates about the rotation axis and is provided with one or a plurality of the reflection surfaces on its outer surface;
Rotating the reflecting surface around the rotation axis by rotating the polygon mirror;
An optical scanning device characterized by the above. The optical scanning device according to claim 3 .
The polygon mirror has a plurality of the reflecting surfaces;
The operation unit rotates the plurality of reflecting surfaces around the rotation axis by continuously rotating the polygon mirror in the same direction.
An optical scanning device characterized by the above. The optical scanning device according to claim 4 .
Each of the plurality of reflecting surfaces provided on the polygon mirror has a different inclination angle with respect to the rotation axis;
An optical scanning device characterized by the above. The optical scanning device according to any one of claims 1 to 5 ,
The irradiation unit irradiates three or more outgoing lights from three or more light sources;
An optical scanning device characterized by the above. In the optical scanning device according to any one of claims 1 to 6 ,
The measurement unit is
A single lens (50) for converging the reflected light of each of the emitted light;
A single light receiving element (60) for detecting each reflected light converged by the lens,
An optical scanning device characterized by the above. An in-vehicle system comprising an optical scanning device (1) for detecting an object existing around the own vehicle and an in-vehicle device for performing processing based on the object detected by the optical scanning device;
The optical scanning device includes:
An irradiation unit (30, 31, 40, 41) for irradiating a plurality of outgoing lights (4) from a plurality of light sources (40, 41);
A scanning unit (10) for irradiating the emitted light toward the measurement region by changing the direction of the emitted light emitted from the irradiation unit over a predetermined measurement range (3);
A measurement unit (50, 60, 70, 80) for measuring an object existing in the measurement area based on the reflected light (5) that is the emitted light reflected outside;
The scanning range (40a, 41a, 42a) is a range that is included in the measurement range and is individually determined corresponding to each of the emitted light,
The central portion within that put on the measurement range, the scanning range of the plurality of the emitted light are overlapped,
The scanning unit is
The plurality of emitted lights are emitted from the irradiation unit to a plurality of positions arranged at a predetermined distance in a direction orthogonal to the rotation axis. Reflective surface (12-15)
By rotating the reflecting surface around the rotation axis, the direction of each emitted light is changed over the corresponding scanning range, thereby irradiating the emitted light toward the measurement region, and For the central part, radiate the emitted light more frequently than other parts ,
The irradiation unit irradiates the reflection surface with the emitted light in an overlapping period in which the reflection surface is in a direction in which the plurality of the emitted light can be reflected toward the central portion;
In-vehicle system characterized by