KR20220023158A - Optical system and LIDAR sensor for vehicle having the same - Google Patents

Abstract

The present invention relates to a vehicle scanning lidar optical system and a vehicle scanning lidar including the same, and more specifically, to a vehicle scanning lidar optical system for identifying an object provided in a vehicle and a vehicle scanning lidar including the same. The present invention discloses a vehicle scanning lidar optical system, which includes: a light transmitting unit (100) for transmitting a laser output from a light source (1) toward a scan target; and a light receiving unit (200) for receiving the light reflected from the scan target. Accordingly, it is possible to minimize a problem that beams changes according to arrangement and alignment of the plurality of lenses.

Description

Vehicle scanning lidar optical system and vehicle scanning lidar including the same

The present invention relates to a vehicle scanning lidar optical system and a vehicle scanning lidar including the same, and more particularly, to a vehicle scanning lidar optical system provided in a vehicle to identify an object, and a vehicle scanning lidar including the same .

Recently, in the field of autonomous vehicles and smart cars, situations that threaten the safety of drivers and pedestrians such as sudden appearance of pedestrians, detection of obstacles in advance, and detection of obstacles due to weakening of headlights are checked in advance to proactively respond to unexpected situations. It calls for strengthening coping skills.

In contrast, a scanner installed in front of a vehicle to check an object in front to warn the driver in advance when the vehicle is moving, as well as to acquire an image that is the basis for stopping or avoiding the vehicle itself is called a scanner.

As a conventional scanner, radar equipment is used to emit microwave (microwave)-like electromagnetic waves to an object, receive electromagnetic waves reflected from the object, and find out the distance, direction, and altitude of the object. There is a problem in that it is not easy to spread.

For this purpose, a lidar-type scanner is being developed, but lidar is a device that emits pulsed laser light and uses a reflector or scatterer to measure distance or atmospheric phenomenon, and a 360-degree lidar has been developed for vehicle mounting. is in the middle

On the other hand, in the case of scanning lidar for vehicles, the diffused beam output from the high-power laser diode is implemented as a vertical sheet beam through a lens, and the implemented sheet beam is reflected on a rotating mirror to scan the object left and right.

In this case, the laser diode light source must be implemented as a vertical sheet beam, but when a conventional symmetric lens is applied, it is difficult to implement the vertical sheet beam.

In order to overcome this problem, in the prior art, the horizontal and vertical angles of view were separately adjusted using a plurality of cylindrical lenses to implement a laser diode light source as a vertical sheet beam, but in this case, the cost increases due to the use of a plurality of lenses, There is a problem in that the volume of the module increases.

In particular, in the case of a lidar scanner for autonomous driving of a vehicle, it is necessary to apply it to a vehicle headlamp or a structure smaller than that. When a plurality of cylindrical lenses are used, there is a problem in that the volume becomes large and cannot be applied.

In addition, in the case of a lidar scanner using a reflecting mirror, the laser emitted from the light transmitting unit cannot be transmitted to the scan target through the reflecting mirror, but is reflected directly and is incident on the light receiving unit.

An object of the present invention is to provide a vehicle scanning lidar optical system capable of scanning a small-volume and precise scan target and a vehicle scanning lidar including the same in order to solve the above problems.

The present invention was created to achieve the object of the present invention as described above, and the present invention is a vehicle scanning lidar optical system, and a light transmitting unit 100 that transmits a laser output from a light source 1 toward a scan target. Wow; Disclosed is a vehicle scanning lidar optical system including a light receiving unit 200 for receiving light reflected from the scan target.

The light transmitting unit 100 and the light receiving unit 200 may be disposed adjacent to each other.

The laser emitted through the light transmitting unit 100 and the reflected light incident through the light receiving unit 200 may have different optical axes.

The light transmitting unit 100 includes: a light transmitting unit housing 110 forming an inner space and having the light source 1 installed at one end of the inner space; A light transmitting lens 120 installed at the other end of the light transmitting unit housing 110 and transmitting the laser output from the light source 1 toward the scan target may be included.

The light receiving unit 200 includes a light receiving unit housing 210 forming an inner space; a photodetector 220 installed at one end of the inner space to convert the light reflected from the scan target into an electrical signal; It may include a light receiving lens 230 installed at the other end of the inner space to receive the light reflected from the scan target and transmit it to the light detection unit 220 .

The light receiving unit 200 is provided in the light receiving unit housing 210, reflects the reflected light passing through the light receiving lens 230 and transmits it to the light detecting unit 220 It further includes a reflecting unit 240 can do.

The light transmitting unit housing 110, the light receiving unit housing 210 so that the center of the laser emitted through the light transmitting lens 120 and the center of the reflected light incident through the light receiving lens 230 on a plane are aligned. ) may be provided on the upper surface of the

The light transmitting lens 120 may be a single lens.

The light receiving lens 230 may have an angle of view of 5 degrees or more and less than 40 degrees.

In addition, the present invention, the optical system (3); Vehicle scanning including a reflective mirror 4 that reflects and transmits the laser output from the light transmitting unit 100 toward the scan target, and reflects and transmits the light reflected from the scan target toward the light receiving unit 200 Start the lidar.

The reflective mirror 4 may be capable of at least one of rotation and vibration.

The lens for scanning LiDAR light source module and the light source module installed therein according to the present invention have the advantage of being able to implement a vertical or horizontal sheet beam for LiDAR scanning of a mirror type that rotates or vibrates up, down, left and right through a single lens.

In addition, the lens for scanning LiDAR light source module and the light source module installed thereon according to the present invention implement a vertical or horizontal sheet beam for LiDAR scanning using a single lens, so that a compact and small-volume light source module can be applied. Therefore, there is an advantage that it can be applied as a lidar sensor for a vehicle.

In addition, the lens for scanning LiDAR light source module and the light source module installed thereon according to the present invention implement a vertical or horizontal sheet beam for LiDAR scanning using a single lens, so that the beam according to the arrangement and alignment of a plurality of lenses There is an advantage in that this running problem is minimized and a stable vertical seat beam can be implemented.

In addition, the vehicle scanning lidar optical system according to the present invention and the vehicle scanning lidar including the same according to the present invention reduce the overall manufacturing cost of the light source module by using a prime lens and have excellent durability.

In addition, the vehicle scanning lidar optical system and the vehicle scanning lidar including the same according to the present invention can minimize the distortion of the scan of the object through the reflection mirror by applying an appropriate arrangement of the light receiving unit and the light transmitting unit and an appropriate shape of the light receiving lens. there is an advantage

1 is a schematic diagram showing a state of a scanning lidar for a vehicle according to the present invention.
FIG. 2 is a side cross-sectional view showing an embodiment of an optical system of the vehicle scanning lidar according to FIG. 1 .
FIG. 3 is a side view showing another embodiment of an optical system of the vehicle scanning lidar according to FIG. 1 .
FIG. 4 is a plan sectional view showing another embodiment of an optical system of the vehicle scanning lidar according to FIG. 3 .
5 is a schematic diagram showing the appearance of a light source module for scanning lidar according to the present invention.
6A and 6B are views showing an embodiment of a lens among the light source module for scanning lidar of FIG. 5 , respectively, a cross-sectional view in a transverse direction and a cross-sectional view in a longitudinal direction.
7A and 7B are views showing another embodiment of a lens among the light source module for scanning lidar of FIG. 5 , respectively, a cross-sectional view in a transverse direction and a cross-sectional view in a longitudinal direction.
8A and 8B are views showing another embodiment of a lens among the light source module for scanning lidar of FIG. 5 , respectively, a cross-sectional view in a transverse direction and a cross-sectional view in a longitudinal direction.
9 is a graph showing angles of view in the vertical axis direction and the horizontal axis direction of a laser pulse signal according to a conventional embodiment.
FIG. 10 is a graph showing angles of view in the vertical and horizontal directions of the laser pulse signal of the light source module for scanning lidar according to FIG. 5 .

Hereinafter, a vehicle scanning lidar optical system according to the present invention and a vehicle scanning lidar including the same will be described with reference to the accompanying drawings.

As shown in Fig. 1, the scanning lidar for a vehicle according to the present invention includes an optical system 3; and a reflective mirror 4 that reflects and transmits the laser output from the light transmitting unit 100 toward the scan target, and reflects and transmits light reflected from the scan target toward the light receiving unit 200 .

Here, the scanning lidar for a vehicle according to the present invention is provided in the vehicle and emits a laser pulse signal in real time, so that the distance can be measured by measuring the arrival time of the reflected pulse signals from the scan target within the measurement range.

Through this, it is possible to enable object identification at a level required for autonomous driving of a vehicle.

On the other hand, the conventional scanning lidar for a vehicle includes an optical module including a lens in order to properly adjust the identification range, and the optical module at this time acts as a factor to increase the overall volume.

In particular, in the configuration for transmitting the laser pulse signal, it is necessary to secure an appropriate identification range and to adjust the angle of view for optimal scanning of the scan target, but there is a problem in that the volume or the number of lenses increases.

In order to overcome this problem, the scanning lidar for a vehicle according to the present invention may be provided in a compact configuration that is small enough to be mounted on a headlamp of a vehicle.

The optical system 3, which is a core configuration according to the present invention, will be described later.

The reflective mirror 4 reflects and transmits the laser output from the light transmitting unit 100 toward the scan target, and reflects and transmits the light reflected from the scan target toward the light receiving unit 200, and has various configurations. possible.

That is, the reflective mirror 4 may transmit the laser output from the optical system 3 to the scan target, and may serve to transmit the light reflected and transmitted from the scan target to the optical system 3 .

At this time, the reflective mirror 4 is disposed between the optical system 3 and the scan target and can be rotated 360 degrees. Through this, the laser output from the light transmitting unit 100 is transmitted to the scan target and from the scan target. The reflected light may be transmitted to the light receiving unit 200 .

For example, the reflection mirror 4 may be a plane mirror having two reflection surfaces, and the rotation speed and the reflection angle may be changed according to the scan range and target.

In addition, the reflection mirror 4 may be able to vibrate up and down and left and right as well as rotation.

More specifically, the reflective mirror 4 may be rotatable, vibrating, or both rotating and vibrating, and the vibration at this time may mean vertical or horizontal vibration.

The optical system 3 is an optical system applied to a vehicle scanning lidar, which outputs a laser pulse signal to a scan target and receives and detects reflected light, and may have various configurations.

For example, the optical system may include a light transmitting unit 100 for transmitting the laser output from the light source 1 toward a scan target, and a light receiving unit 200 for receiving light reflected from the scan target.

Here, the light source 1 is a configuration for outputting a laser pulse signal output as a scan target, and various configurations are possible.

For example, as a laser diode, the light source 1 may output a laser pulse signal to a light transmitting lens 110 to be described later according to a light transmitting path.

The light transmitting unit 100 transmits the laser output from the light source 1 toward the scan target, and various configurations are possible.

For example, the light transmitting unit 100 may include: a light transmitting unit housing 110 forming an inner space and having the light source 1 installed at one end of the inner space; A light transmitting lens 120 installed at the other end of the light transmitting unit housing 110 and transmitting the laser output from the light source 1 toward the scan target may be included.

As long as the light transmitting unit housing 110 is configured to form an internal space, any configuration is applicable.

For example, as shown in FIGS. 2 to 4 , the light transmitting unit housing 110 may have a cube-shaped inner space, and a light transmitting path may be formed in the inner space.

Meanwhile, the light transmitting unit housing 110 may be provided adjacent to the light receiving unit housing 210 to be described later, and more preferably, may be disposed on the upper surface of the light receiving unit housing 210 .

More specifically, in the light transmitting unit housing 110, as shown in FIG. 4, the light receiving lens 230 and the light transmitting lens 120 provided in the light receiving unit housing 210 on the upper surface of the light receiving unit housing 210 are planar. It may be provided at a position aligned with the phase.

That is, the light transmitting unit housing 110 aligns the center of the laser emitted through the light transmitting lens 120 with the center of the reflected light incident through the light receiving lens 230 on a plane surface of the light receiving unit housing 210 . can be provided in

At this time, the light transmitting unit housing 110, the light source 1 may be installed at one end, and the light transmitting lens 120 for transmitting the laser output from the light source 1 toward the scan target at the other end may be installed. .

Accordingly, the light transmitting unit housing 110, the light transmitting path can be formed in the inner space.

The light transmitting lens 120 is installed at the other end of the light transmitting unit housing 110 and transmits the laser output from the light source 1 toward the scan target, and various configurations are possible.

The light transmitting lens 120 is a single lens provided in the light transmitting unit housing 110, and by providing the light transmitting lens 120 as a single lens, a compact and small volume optical system capable of being installed in a headlamp of a vehicle. can be achieved

Meanwhile, a detailed description of the light transmitting lens 120 will be described later.

The light receiving unit 200 is configured to receive the light reflected from the scan target, and various configurations are possible.

That is, in the light receiving unit 200, the laser pulse signal output from the light source 1 passes through the light transmitting unit 100 and the reflecting mirror 4 to reach the scan target, and the reflected light is again reflected by the reflecting mirror 4 It may be a configuration reached through .

For example, the light receiving unit 200 may include a light receiving unit housing 210 forming an inner space; a light detecting unit 220 installed at one end of the inner space and converting light reflected from a scan target into an electrical signal; It may include a light receiving lens 230 installed at the other end of the inner space to receive the light reflected from the scan target and transmit it to the light detection unit 220 .

In addition, the light receiving unit 200 is provided in the light receiving unit housing 210 to reflect the reflected light passing through the light receiving lens 230 to transmit to the light detecting unit 220 It may further include a reflective unit (240) there is.

The light receiving unit housing 210 may have any configuration as long as it forms an internal space.

For example, the light receiving unit housing 210, as shown in FIG. 2, is a cube like the above-described light transmitting unit housing 110, with a light receiving lens 230 at one end and a light detecting unit 220 at the other end. It may be a provided shape.

Meanwhile, as another example, as shown in FIGS. 3 and 4 , the light receiving unit housing 210 has a front end 211 having a light receiving lens 230 at the end and forming a quadrangle on a plane, and the opposite end. The rear end 213, the front end 211, and the rear end 213 provided with the photodetector 220 are connected to the light receiving lens 230 and the photodetector 220 so that they are at right angles to each other. can do.

In this case, the light receiving unit housing 210 is provided at a right angle such that one side of the connection unit 212 connects the front end 211 and the rear end 213 , and the other side is the front end 211 and the rear end 213 . It may be provided in a diagonal line on a plane to connect the , and the above-described reflector 240 may be provided in a diagonal portion on a plane to form a light receiving path.

Accordingly, in the light receiving unit housing 210, the light incident through the light receiving lens 230 of the front end 211 is reflected through the reflecting unit 240 of the connecting unit 212, and the light detecting unit ( 220), a light receiving path may be formed.

The photodetector 220 is installed at one end of the internal space to convert the light reflected from the scan target into an electrical signal, and various configurations are possible.

That is, the photodetector 220 detects the light reflected from the scan target and converts it into an electrical signal, so that the time until the laser pulse signal output from the light source 1 arrives can be measured, and the scan target can be used to measure the location and distance of

For example, the photodetector 220 may include a plurality of photodetectors, and may receive a plurality of reflected lights having different incident angles through the plurality of photodetectors.

In addition, the photodetector 220 may convert the arrival of the reflected light into an electrical signal and transmit it to an external processor, thereby determining the position of the scan target.

On the other hand, in this case, the light detection unit 220, according to the embodiment of the light receiving unit housing 210, is disposed at a point opposite to the linear distance from the light receiving lens 230 to detect the reflected light passing through the light receiving lens (230) As another example, light reflected from the light receiving lens 230 through the reflection unit 240 may be detected.

The light receiving lens 230 is installed at the other end of the inner space to receive the light reflected from the scan target and transmit it to the photodetector 220 , and various configurations are possible.

For example, the light-receiving lens 230, like the light-transmitting lens 120 to be described later, has an amorphous surface and is provided with some distortion, ie, refraction, in the longitudinal or transverse direction. Lenses may be used.

As another example, a symmetrical spherical lens may be used as the light receiving lens 230 , and light incident from the scan target through the reflective mirror 4 may be stably transmitted to the photodetector 220 .

In addition, the light-receiving lens 230 may be a circle, a square, or a polygon on a plane, and any type of lens such as a spherical surface, an aspherical surface, or a cylindrical type is applicable.

Meanwhile, in this case, the light-receiving lens 230 may be provided as a single lens, and an angle of view of 5 degrees or more and less than 40 degrees may be applied.

In this case, the light-receiving lens 230 may be made of a material such as glass, plastic, or silicon, and this material configuration may be equally applied to the light-transmitting lens 120 to be described later.

Meanwhile, the light-receiving lens 230 may maintain resolution by focusing one beam spot among the plurality of photodetectors of the photodetector 220 on one photodetector, that is, on one channel.

If the area of the beam spot, which is the image image of the reflected light passing through the light receiving lens 230 , becomes larger than the area of one channel of the photodetector 220 , there is a problem in that resolution is impaired.

To this end, in the light-receiving lens 230 , the f/T value, which is the ratio between the distance T from the exit surface of the lens to the image and the effective focal length f, may be 0.9 or more and 1.27 or less.

That is, when the f/T value, which is the ratio between the distance T from the exit surface of the lens to the image and the effective focal length f of the lens, is less than 0.9 or exceeds 1.27, the beam spot that is the image of the reflected light passing through the light receiving lens 230 is As the area increases, resolution may be impaired.

The reflection unit 240 is provided in the light receiving unit housing 210 to reflect the reflected light passing through the light receiving lens 230 and transmit it to the light detecting unit 220 , and various configurations are possible.

For example, as described above, the reflective unit 240 is disposed in a diagonal arrangement portion of the connection unit 212 connecting the front end 211 and the rear end 213 of the light receiving unit housing 210, thereby reducing the light receiving path. can be formed, thereby stably transmitting the reflected light passing through the light receiving lens 230 to the photodetector 220 .

Meanwhile, the light transmitting unit 100 and the light receiving unit 200 of the optical system according to the present invention may be disposed adjacent to each other.

That is, the light transmitting unit 100 and the light receiving unit 200 may be disposed adjacent to each other so as to include the light transmitting unit 100 and the light receiving unit 200 as a single optical system, thereby reducing the volume and having a compact configuration.

On the other hand, in this case, the laser emitted through the light transmitting unit 100 and the reflected light incident through the light receiving unit 200 have different optical axes, and for example, the optical axis of the light transmitting unit 100 is the light receiving unit ( 200) may be disposed to be located at the upper end compared to the optical axis.

Hereinafter, a lens for a scanning lidar light source module that transmits a laser output from the light source 1 for outputting a laser according to the present invention and a light source module installed thereon will be described with reference to the accompanying drawings.

5 , the light source module according to the present invention may include a light source 1 for outputting a laser and a lens 2 for transmitting the laser output from the light source 1 .

On the other hand, since the lens 2 applied at this time has the same configuration as that of the light transmitting lens 120 described above, it is of course also applicable to the above-described configuration of the light transmitting lens 120 .

In addition, since the light source 1 is the same as described above, a detailed description thereof will be omitted.

In this case, in the light source module, the distance (G) from the light source (1) for outputting a laser and the incident surface (10) of the lens (2) for transmitting the output laser to the scan target may be 0.3 mm or more and 9.5 mm or less. there is.

More specifically, in the lens according to the present invention, parallel light must be implemented in the transverse direction in order to implement the transverse angle of view to 0.5 degrees or less. and the distance G to the incident surface 10 is a very important factor.

If the distance (G) is less than 0.3mm, there is a problem that the horizontal angle of view of the lens exceeds the desired target value of 0.5 degrees. Since it becomes wider and the light efficiency also falls by more than 10% after passing, it can be arranged within a distance of 0.3 mm or more and 9.5 mm or less, which is an appropriate range.

On the other hand, since the lens for scanning lidar light source module according to the present invention can form a sheet beam by varying the vertical and horizontal angles of view through a single lens, the volume is smaller than that of the light source module to which a plurality of cylindrical lenses are applied. Its utility is excellent, and in particular, it has the advantage of being able to apply a size that can be installed in the headlamp of a vehicle.

To this end, the lens for the scanning lidar light source module according to the present invention is configured to transmit the laser output from the light source 1 as shown in FIG. 5 , and the laser output from the light source 1 is incident an incident surface 10 and; It forms a lens together with the incident surface 10 and includes an exit surface 20 for emitting the laser of the light source 1 .

In addition, the lens for a scanning lidar light source module according to the present invention may include a side portion 30 forming a side surface of the lens between the incident surface 10 and the emission surface 20 .

At this time, the lens for the scanning lidar light source module according to the present invention, any lens can be applied, for example, the planar shape may be any one of a circle, an ellipse, or a polygonal shape.

In addition, the planar shape of the incident surface 10 and the planar shape of the exit surface 20 may be the same or different.

On the other hand, the lens for the scanning lidar light source module according to the present invention, the emitted laser may be formed of a sheet beam having a length in the longitudinal direction.

That is, the laser output through the lens according to the present invention may be formed as a sheet beam having a length in the longitudinal direction and a relatively small angle of view in the transverse direction compared to the longitudinal direction.

In this case, the output laser may be implemented as a sheet beam having a horizontal angle of view of 0.2 degrees and a vertical angle of view of 10 degrees.

As another example, as described above, the laser output through the lens according to the present invention may be formed as a sheet beam having a length in the transverse direction and a relatively small angle of view in the longitudinal direction compared to the transverse direction.

In this case, the output laser may be implemented as a sheet beam having a horizontal angle of view of 10 degrees and a vertical angle of view of 0.2 degrees.

To this end, the lens according to the present invention may be formed of an anamorphic surface such that the emitting surface 20 has different degrees of refraction in the transverse direction and the refraction in the longitudinal direction.

This will be described later in detail while explaining the exit surface 20 .

The incident surface 10 is a configuration to which the laser output from the light source 1 is incident, and may form a lens together with the emission surface 20 to be described later.

For example, the incident surface 10 may be provided in a planar shape so that the laser output from the light source 1 is incident.

As another example, the incident surface 10 extends horizontally at both ends of the concave portion 11 and the concave portion 11, the center of which is concave toward the exit surface 20 with respect to the longitudinal axis direction. It may include a portion 12 .

That is, the incident surface 10 may include concave portions 11 that are concavely formed toward the exit surface 20 symmetrically with respect to the center in the longitudinal axis direction, and are horizontal at both ends of the concave portion 11 . It may include an extension part 12 that is extended to

In this case, a step may be formed between the concave portion 11 and the expanded portion 12 , and more specifically, the step may be provided by protruding downward from the expanded portion 12 .

Meanwhile, in this case, the incident surface 10 may be maintained horizontally in the horizontal axis direction.

Also, of course, the incident surface 10 may be provided in a concave shape having a smaller curvature than the concave portion 11 in the transverse direction.

At this time, the incident surface 10 corresponds to the exit surface 20 to be described later, and when the exit surface 20 is formed to be convex in the horizontal axis direction, the entrance surface 10 may be formed to be concave in the vertical axis direction. there is.

That is, the incident surface 10 and the exit surface 20 may be formed to be concave and convex, respectively, by changing directions in the horizontal or vertical direction.

The exit surface 20 may be formed as an anamorphic surface so that the degree of refraction in the transverse direction and the degree of refraction in the longitudinal direction are different from each other in order to form a sheet beam applied to the vehicle scanning lidar through a single lens.

On the other hand, the characteristics of the horizontal axis direction and the vertical axis direction described in this specification are not limited thereto, it is only an example, and it is also a matter of course that they may have opposite characteristics.

The emission surface 20 may be formed so that the angle of view in the transverse direction of the emitted laser is smaller than the angle of view in the vertical direction, and more specifically, the angle of view in the transverse direction is 0.5 degrees and the angle of view in the vertical direction is 10 degrees. A sheet beam can be formed.

To this end, the emission surface 20 may be formed such that the ratio (Cx/Cy) of the curvature Cx in the transverse direction to the curvature Cy in the longitudinal direction is greater than 6.

That is, in order for the ratio of the horizontal angle of view to the vertical angle of view, which is the target value according to the present invention, to be 1:5, and more preferably, the ratio of the horizontal axis to the vertical angle of view is 1:20 or more, the curvature (Cx) in the horizontal axis direction and the vertical axis direction The ratio (Cx/Cy) of the curvature (Cy) of must be greater than 6, and when it is less than 6, there is a problem in that the sheet beam in the vertical direction cannot be implemented.

Accordingly, the exit surface 20 may be formed such that the ratio (Cx/Cy) of the curvature (Cx) in the transverse direction to the curvature (Cy) in the vertical direction is greater than 6, and more specifically, a value of 6.31 or more. can have

On the other hand, as another example, in order to realize a horizontal sheet beam, the ratio of the horizontal angle of view to the vertical angle of view is 5:1, and more preferably, the ratio of the horizontal angle of view to the vertical angle of view is 20:1 or more. (Cy/Cx), which is the ratio of (Cy) to the curvature (Cx) in the transverse direction, is formed to be greater than 6, and more specifically, may have a value of 6.31 or more.

The emission surface 20 may be formed to be convex with a center symmetrical with respect to the horizontal axis direction, and at this time, may be formed to remain horizontal in the vertical axis direction.

On the other hand, as another example, the center may be symmetrically formed with respect to the horizontal axis direction and formed to be convex while changing the curvature in the vertical axis direction to be convex.

At this time, the curvature in the vertical axis direction is smaller than the curvature in the horizontal axis direction.

Meanwhile, as another example, the emitting surface 20 may be formed such that an angle of view in the vertical axis direction of the emitted laser is smaller than an angle of view in the horizontal axis direction.

That is, in the emitting surface 20 , the angle of view in the vertical axis direction of the laser emitted so that the laser emitted through the light transmitting unit 100 has a sheet beam in the horizontal direction instead of in the vertical direction as described above is greater than the angle of view in the horizontal axis direction. It may be formed to be small.

Accordingly, the emitted laser can be formed into a sheet beam having a length in the transverse direction.

To this end, the exit surface 20 may have different curvatures in the transverse direction and in the longitudinal direction as described above, and more specifically, the curvature in the longitudinal direction (Cy) and the curvature in the transverse direction (Cx). The ratio (Cy/Cx) may be greater than 6.

That is, the emitting surface 20, in order to form the above-mentioned longitudinal sheet beam into a transverse sheet beam, the above-described conditions in the transverse direction and in the longitudinal direction may be applied oppositely.

Hereinafter, the effect of using the light source module according to the present invention will be described with reference to the accompanying drawings.

In the case of outputting a laser through a conventional laser diode, as shown in FIG. 9 , in this case, a blue line indicates an angle of view in the vertical axis direction and a green line indicates an angle of view in the horizontal axis direction.

In this case, an image having an angle of view of 11 degrees in the vertical axis direction and an angle of view of 25 degrees in the horizontal axis direction is formed, so that a seat beam in the vertical direction cannot be formed.

As a result of simulating the light source module according to the present invention to overcome this problem, as shown in FIG. 10 , it was confirmed that a sheet beam in the vertical direction having a horizontal angle of view of 0.15 degrees while maintaining a vertical angle of view of 9.8 degrees can be realized. did.

Therefore, the light source module for scanning lidar according to the present invention has the advantage of being able to be installed in a vehicle headlamp because of its small volume and compactness by applying a single lens while implementing a vertical sheet beam that can be applied to the optimal scanning lidar.

Since the above has only been described with respect to some of the preferred embodiments that can be implemented by the present invention, as noted, the scope of the present invention should not be construed as being limited to the above embodiments, and It will be said that the technical idea and the technical idea with the root are all included in the scope of the present invention.

1: Light source 2: Lens
3: Optical system 4: Reflective mirror
10: entrance side 20: exit side
100: light transmitting unit 200: light receiving unit

Claims (11)

A scanning lidar optical system for a vehicle, comprising:
a light transmitting unit 100 for transmitting the laser output from the light source 1 toward the scan target;
Scanning lidar optical system for a vehicle, characterized in that it comprises a light receiving unit (200) for receiving the light reflected from the scan target. The method according to claim 1,
The light transmitting unit 100 and the light receiving unit 200 are scanning lidar optical system for a vehicle, characterized in that disposed adjacent to each other. 3. The method according to claim 2,
The scanning lidar optical system for a vehicle, characterized in that the laser emitted through the light transmitting unit (100) and the reflected light incident through the light receiving unit (200) have different optical axes. The method according to claim 1,
The light transmitting unit 100,
a light transmitting unit housing 110 forming an inner space and having the light source 1 installed at one end of the inner space;
and a light transmitting lens installed at the other end of the light transmitting unit housing 110 and transmitting the laser output from the light source (1) toward the scan target. 5. The method according to claim 4,
The light receiving unit 200,
a light receiving load housing 210 forming an inner space;
a photodetector 220 installed at one end of the inner space to convert the light reflected from the scan target into an electrical signal;
and a light receiving lens (230) installed at the other end of the inner space to receive the light reflected from the scan target and transmit it to the photodetector (220). 6. The method of claim 5,
The light receiving unit 200,
Vehicle scanning characterized in that it is provided in the light receiving unit housing 210, and further comprises a reflecting unit 240 to reflect the light that has passed through the light receiving lens (230) to transmit it to the light detecting unit (220) lidar optics. 6. The method of claim 5,
The light transmitting unit housing 110,
It is provided on the upper surface of the light receiving unit housing 210 so that the center of the laser emitted through the light transmitting lens 120 and the center of the reflected light incident through the light receiving lens 230 on a plane are aligned. Vehicle scanning lidar optical system. 6. The method of claim 5,
The light transmitting lens 120,
A vehicle scanning lidar optical system, characterized in that it is a single lens. 6. The method of claim 5,
The light receiving lens 230,
A vehicle scanning lidar optical system, characterized in that the angle of view is more than 5 degrees and less than 40 degrees. 10. An optical system (3) according to any one of claims 1 to 9;
and a reflective mirror 4 that reflects and transmits the laser output from the light transmitting unit 100 toward the scan target, and reflects and transmits the light reflected from the scan target toward the light receiving unit 200 It is a scanning lidar for vehicles. 11. The method of claim 10,
The reflective mirror (4) is,
A scanning lidar for a vehicle, characterized in that at least one of rotation and vibration is possible.

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