KR102476949B1 - Distance measuring device for driver monitoring system and driver monitoring system - Google Patents

Abstract

One embodiment, a transmitter for irradiating a laser light source; an optical path changing unit for changing a path of the light emitted from the transmitting unit; The optical path changing unit includes a rotating device for adjusting the direction of the laser light source, and a reflection unit that collects the laser light source reflected from the object passing through the optical path changing unit; It is possible to provide a distance measuring device comprising a; and a receiving unit in which an image reflected from the reflecting unit is formed.

Description

Distance measuring device for driver monitoring and driver monitoring system {Distance measuring device for driver monitoring system and driver monitoring system}

The present embodiment relates to a distance measuring device and a driver monitoring system for driver monitoring.

The causes of traffic accidents are classified into environmental factors, vehicle factors, and human factors. Among them, it is known that about 90% of automobile traffic accidents that occur annually are caused by human carelessness or mistakes.

Like 'Heinrich's law', since human errors can accumulate and cause major accidents, there is a need to prevent potential accidents by monitoring such human negligence or mistakes. For example, a driver monitoring system (DMS) has emerged to monitor a driver in a vehicle to detect a change in the driver and induce an immediate response.

The heart of a driver monitoring system (DMS) is the continuous monitoring of the driver. A camera is attached to the vehicle to continuously monitor the driver's eyes, face, posture, etc., detect abnormal behavior of the driver, and warn of danger. In order to monitor the driver, a camera that monitors the driver is generally installed on the front of the vehicle.

However, when a camera fixed in the front is installed and used, there is a problem in that it is difficult to recognize a driver present on the side. In particular, in order to recognize a driver approaching from the side, an additional camera must be installed in addition to the fixed camera. Since the camera must be installed in each monitoring area, costs increase and the size of the camera module increases. In addition, a method of rotating the camera itself has been devised, but there is a disadvantage in that the stability of the camera is lowered and the lifespan of the camera is reduced in the process of rotating the frame in which the camera is fixed.

In addition, while the distance between the driver and the camera in the vehicle is generally short, within 1 m, the light travel path is extended to about 2 to 3 m in order to recognize the driver outside the vehicle. In this case, the intensity of light is weakened in inverse proportion to the square of the distance, and the amount of light recognized by the image sensor is insufficient, resulting in noise. Although a convex lens is used to collect light, chromatic aberration occurs, and in order to eliminate this chromatic aberration, it is necessary to use it together with a concave lens, which increases the size of the camera module, making it difficult to miniaturize.

Against this background, an object of this embodiment is to provide a solution for providing a direction control function to a fixed camera and solving the problem of insufficient amount of light reaching an image sensor.

In order to achieve the above object, the first embodiment, a transmitter for irradiating a laser light source; an optical path changing unit for changing a path of the light emitted from the transmitting unit; The optical path changing unit includes a rotating device for adjusting the direction of the laser light source, A reflecting unit that collects the laser light source reflected from the target through the optical path changing unit; It is possible to provide a distance measuring device comprising a; and a receiving unit in which an image reflected from the reflecting unit is formed.

In addition, the second embodiment, a transmitter for irradiating a laser light source; an optical path changing unit for changing a path of the light emitted from the transmitting unit; The optical path changing unit includes a rotating device for adjusting the direction of the laser light source, and a reflection unit that collects the laser light source reflected from the object passing through the optical path changing unit; and a receiving unit on which an image reflected from the reflecting unit is formed, wherein the transmitting unit is fixed by a support unit and includes a first diffusion unit that diffuses light transmitted from a light source including a laser unit; a second diffusion unit that is moved by the control unit and diffuses the light passing through the first diffusion unit at a set radiation angle; body part; And a control device, wherein the coil inside the main body adjusts the distance between the first diffusion part and the second diffusion part by interaction with the magnet fixed inside the control part, and the control device controls the laser part. It is possible to provide a distance measuring device that controls the output of a set area.

In addition, the third embodiment, the standby mode step of monitoring the outside of the vehicle; a driver recognition step of recognizing a driver outside the vehicle in a first recognition range in the standby mode step and activating a camera; checking the driver's face moved from the first recognition range to the second recognition range by the camera; and monitoring the driver in the vehicle when the driver is inside the vehicle.

The distance measuring device may further include a control device for adjusting an irradiation angle of light generated by the transmitter, and the control device may control a field of view (FOV) of the transmitter according to shooting conditions.

In the distance measuring device, the receiving unit may include a plurality of lenses adjusted for variable focus, and the controller may control the focus of the receiving unit according to a photographing condition.

In the distance measuring device, the optical path changing unit may be any one of a prism, a beam splitter, an optical fiber, and a concave mirror, or a set thereof.

In the distance measuring device, the reflector may include a concave lens and a flat mirror.

In the distance measuring device, the transmitting unit may include a diffusion unit moving by an adjusting unit and diffusing light transmitted from a light source including a laser unit to a set radiation angle; body part; and

A control device is included, and the coil inside the main body adjusts the distance between the diffusion part and the light source by interaction with a magnet fixed inside the adjusting part, and the control device controls the output of a set area of the laser part. can do.

In the distance measuring device, the control device may receive and analyze a signal of the receiver.

In the distance measuring device, the control device may adjust the output of the set area of the laser unit by calculating the adjustment ratio of the output.

In the distance measuring device, the control device may adjust the output of the laser unit within a saturation range of the receiver unit.

The driver monitoring system may further include returning to a standby mode when the engine of the vehicle is turned off.

In the driver monitoring system, the direction of the camera may be toward the side of the vehicle in the standby mode step, and the direction of the camera may be toward the driver in the driver monitoring step.

In the driver monitoring system, power may be minimized in the standby mode step, and power output may be increased in the driver recognition step.

The driver monitoring system and the driver confirmation step further include a step of comparing the set driver's face with the face of an approaching target, and the driver's face set in the face comparison step matches the face of the target. lock can be unlocked.

As described above, according to the present embodiment, the direction and angle of the light can be adjusted using the direction control device, and the concave mirror is used instead of the convex lens to solve the problem of insufficient light while keeping the size of the camera small. do.

1 is a first exemplary perspective view of a distance measurement device according to a first embodiment.
2 is a perspective view of a second example of the distance measurement device according to the first embodiment.
3 is a top view of a first example of a distance measurement device according to a first embodiment.
4 is a third exemplary perspective view of the distance measurement device according to the first embodiment.
5 is a third exemplary top view of the distance measuring device according to the first embodiment.
6 is a diagram illustrating a process in which light from a transmitter is transferred to a receiver after reaching an object.
7 is a diagram illustrating an embodiment of a distance measuring device for a driver monitoring system.
8 shows a first embodiment of an optical path changing unit.
9 shows a second embodiment of the optical path changing unit.
10 shows a third embodiment of an optical path changing unit.
11 shows a fourth embodiment of an optical path changing unit.
12 shows a fifth embodiment of an optical path changing unit.
13 shows a sixth embodiment of an optical path changing unit.
14 shows a seventh embodiment of an optical path changing unit.
15 shows an eighth embodiment of an optical path changing unit.
16 shows a ninth embodiment of an optical path changing unit.
17 shows a first embodiment of the reflector.
18 shows a second embodiment of the reflector.
19 shows a third embodiment of the reflector.
20 shows a fourth embodiment of the reflector.
21 is a diagram illustrating steps in which light is transferred according to an embodiment of a distance measuring device for a driver monitoring system.
22 is a diagram illustrating a case in which a step of adjusting a receiver and a transmitter by a control device is added.
23 is a diagram showing each step of the driver monitoring system.
24 is a diagram showing a first embodiment of a transmitter.
25 is a diagram illustrating a second embodiment of a transmitter.
26 is a diagram showing a third embodiment of a transmitter.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same components have the same numerals as much as possible even if they are displayed on different drawings. In addition, in describing the present invention, a detailed description of a related known configuration or function, which is determined to obscure the gist of the present invention, will be omitted.

In addition, in describing the components of the present invention, terms such as first, second, A, B, a, b, etc. may be used. These terms are only used to distinguish the component from other components, and the nature, sequence, or order of the corresponding component is not limited by the term. When an element is described as being “connected,” “coupled to,” or “connected” to another element, that element is directly connected or connectable to the other element, but there is another element between the elements. It should be understood that elements may be “connected”, “coupled” or “connected”.

Among the components of the present invention, "light", "light" or "beam" may be interpreted in the same sense within the scope of not harming the essence of the present invention.

1 is a first exemplary perspective view of a distance measurement device according to a first embodiment.

Referring to FIG. 1 , the distance measurement device 10 of the driver monitoring system may include a transmitter 11, an optical path changer 400, a reflector 500, a receiver 13, and the like.

The driver monitoring system 100 is an auxiliary system that detects the driver's driving state, and may assist the driver's driving by recognizing and analyzing the driver's facial expression, the driver's facial angle, the driver's eyes, and the driver's gaze.

Since the driver monitoring system 100 generally only detects a driver inside the vehicle, there is a need to efficiently recognize a driver approaching from outside the vehicle. Therefore, by additionally including an optical element capable of changing an optical path, the distance measuring device 10 can be physically and structurally changed so that the driving state of the driver inside the vehicle can be detected and the driver outside the vehicle can be recognized. By using an optical element capable of changing an optical path, the camera module can be miniaturized and the above objectives can be achieved at the same time.

The transmitter 11 may include a light source. The type of light source is not limited as long as it can generate light. For example, it may be a Vertical Cavity Surface Emitting Laser (VCSEL), a Resonant Cavity Light Emitting Diode (RCLED), or a Light Emitting Diode (LED).

The light path changer 400 may change the path of light emitted from the transmitter. Illustratively, a prism, a splitter, an optical fiber, etc. may be used, but the type is not limited.

The optical path changing unit 400 may include a rotating device for adjusting the direction of the laser light source.

The reflector 500 may pass through the optical path changing unit and collect the laser light source reflected from the target. Illustratively, a concave mirror, a flat mirror, or a combination thereof may be used, but the type is not limited.

The receiving unit 13 may form an image reflected from the reflecting unit. The type of the receiver 603 is not limited as long as it can measure light. Illustratively, it may be a charge-coupled device (CCD) or a complementary metal oxide semiconductor (CMOS).

The type of the control device (not shown) is not limited as long as it can receive a signal from the receiver and control the transmitter.

A control device (not shown) may adjust an irradiation angle of light generated by the transmitter. Illustratively, a control device (not shown) may control a field of view (FOV) of the transmitting unit according to a shooting condition.

A control device (not shown) may control the receiver 13 having a plurality of lenses adjusted for variable focus. Illustratively, a control device (not shown) may control the focus of the receiver according to photographing conditions.

The distance measuring device 10 of the driver monitoring system 100 may be disposed towards the inside or outside of the vehicle. In this case, the driver 90 may be located within the first radiation angle 50 or may be located within the second radiation angle 60 .

The first radiation angle 50 and the second radiation angle 60 may be adjusted according to the type of the transmitter 11 . The size of the radiation angle is not limited to the angle shown in the drawings. Illustratively, the first radiation angle 50 may be greater than the second radiation angle 60, and the first radiation angle 50 is a radiation angle for a short distance and the second radiation angle 60 is a radiation angle for a long distance. can

The radiation angle for short distance may have a wider FOV than the radiation angle for long distance so that light can reach a large-area subject.

A far-distance radiation may have a narrower field of view (FOV) than a short-distance radiation angle so that concentrated light can reach a subject.

The first radiation angle 50 and the second radiation angle 60 may be adjusted according to the area where the target is located. Illustratively, the first radiation angle 50 may be an irradiation angle when an object is located in the first area 70 , and the second radiation angle 60 may be an irradiation angle when an object is located in the second area 80 . can be angular

The distance measurement device 10 of the driver monitoring system 100 changes the field of view (FOV) or measurement area according to the location or distance of the subject to check the presence of a driver approaching the vehicle from outside the vehicle or whether the owner of the vehicle exists. and can judge.

The size or position of the first region 70 and the second region 80 may be changed depending on circumstances, and are not limited to the size or position shown in the drawings.

2 is a perspective view of a second example of the distance measurement device according to the first embodiment.

Referring to FIG. 2 , the object may move from the second area 80 to the first area 70 . When the object moves from the second area to the first area, the radiation angle of the transmitter 11 may change from the second radiation angle 60 to the first radiation angle 50 . In this case, since the focus for a long distance can be changed to a focus for a short distance, the distance measuring device can accurately measure the target and efficiently utilize the output.

In the second area 80, the driver's movement can be checked to determine whether the driver is approaching the vehicle, and in the first area 70, the driver's face or a predetermined part can be used to recognize the driver, so that the driver can board the vehicle. preparation can proceed.

3 is a top view of a first example of a distance measurement device according to a first embodiment.

Referring to FIG. 3 , a vehicle and an object may be displayed on a plane. In the distance measurement device 10, light is transmitted at a first radiation angle 50 or a second radiation angle 60 to recognize a target.

The first area 70 or the second area 80 may be set based on the distance from the vehicle. The reference point for determining the distance to the vehicle may be the windshield, and an arbitrary part of the vehicle may be used as the reference point. Illustratively, a point where the distance measuring device 10 of the driver monitoring system 100 is installed may be used as a reference point.

The first area 70 or the second area 80 may be determined in any method, and the area may be divided into one or more areas. The first area may be defined as an area having a certain radius or distance from the vehicle, and may be defined according to the driving mode of the distance measuring device 10 of the driver monitoring system 100. For example, the first area 70 may be defined according to the measurement distance or range of an object when the distance measuring device 10 operates in a short range mode. As another example, the second area 80 may be defined according to the measurement distance or range of an object when the distance measuring device 10 operates in a remote mode.

The distance measuring device 10 may be installed inside or outside the vehicle, and a direction in which the distance measuring device transmits light may be inside or outside the vehicle. For example, the distance measuring device 10 may be installed on an outer surface of a driver's seat door inside a vehicle. As another example, the distance measuring device 10 may be installed around the instrument panel of the vehicle inside the vehicle.

The distance measuring device 10 according to an embodiment may be installed in a room mirror, instrument panel, dashboard, sun visor, center fascia, air conditioner grill or its surroundings inside a vehicle. Infrared lighting can be installed together to minimize driver's vision obstruction and eye fatigue.

The distance measuring device 10 according to an exemplary embodiment may define an installation location to easily change an optical path.

A proximity sensor module may be further added to recognize the driver's approach together with the driver's distance measurement of the distance measuring device 10 .

In order to reduce power consumption of the distance measuring device 10, driving of the distance measuring device 10 may be controlled when the driver's approach is not recognized. Illustratively, in a sleep mode for determining only whether a driver is approaching, the distance measuring device 10 may be driven using minimum power.

4 is a third exemplary perspective view of the distance measurement device according to the first embodiment.

Referring to FIG. 4 , the distance measuring device 110 may change an irradiation angle of light according to a location of a target. For example, when the target is in a vehicle, the irradiation direction of light may be changed to the inside of the vehicle.

In the driver monitoring system 200, the distance measurement device 110 may measure a distance to a target inside the vehicle. The distance measuring device 110 may have a radiation angle 150, which may be an arbitrary angle.

In the driver monitoring system 200 according to an exemplary embodiment, the distance measuring device 110 may be included in the over console to measure the driver's gesture.

The distance measurement device 110 included in the overconsole can detect the driver's state or gesture from the ceiling inside the vehicle. In this case, in addition to the person in the driver's seat, a person sitting in the back seat can be recognized at the same time.

5 is a third exemplary top view of the distance measuring device according to the first embodiment.

Referring to FIG. 5 , a vehicle and an object may be displayed on a plane. In the distance measuring device 110, light is transmitted at a radiation angle 150 to recognize a target.

The location of the object may be any location inside the vehicle, and is not limited to the location shown. Illustratively, the target may be located in a driver's seat or a front passenger's seat.

6 is a diagram illustrating a process in which light from a transmitter is transferred to a receiver after reaching an object.

Referring to FIG. 6 , light 20 transmitted from the transmitter is reflected after reaching an object, and the reflected light 30 may be transmitted to the receiver again.

Disposition of the transmitter 11 and the receiver 13 may be arranged side by side, but is not limited thereto.

The transmitter 11 and the receiver 13 may be integrally formed, but is not limited thereto.

7 is a diagram illustrating an embodiment of a distance measuring device for a driver monitoring system.

Referring to FIG. 7 , in the distance measuring device 300 according to an exemplary embodiment, the optical path changer may be a prism, and the reflector may include a concave mirror.

8 shows a first embodiment of an optical path changing unit.

9 shows a second embodiment of the optical path changing unit.

10 shows a third embodiment of an optical path changing unit.

11 shows a fourth embodiment of an optical path changing unit.

12 shows a fifth embodiment of an optical path changing unit.

13 shows a sixth embodiment of an optical path changing unit.

14 shows a seventh embodiment of an optical path changing unit.

15 shows an eighth embodiment of an optical path changing unit.

16 shows a ninth embodiment of an optical path changing unit.

Referring to FIGS. 8 to 16 , the type of the optical path changing unit is not limited as long as it can change the direction of light.

According to the first embodiment of the optical path changing unit, different optical paths can be set using a plurality of transmitting units.

According to the second embodiment of the optical path changing unit, the transmitting unit may be attached to the rotatable substrate to change the optical path.

According to the third embodiment of the optical path changing unit, the transmitting unit may be rotated by a rotating device of the transmitting unit itself to change the optical path.

According to the fourth embodiment of the light path changing unit, the light path changing unit may include a prism. The type of prism is not limited as long as it is for changing the path of light.

According to the fifth embodiment of the light path changing unit, the light path changing unit may include a beam splitter. The beam splitter is an optical device that splits light into two, and the type is not limited as long as it can split the light.

According to the sixth embodiment of the light path changing unit, the light path changing unit may include an optical fiber. The type of optical fiber is not limited as long as it can transmit an optical signal.

According to the seventh embodiment of the optical path changing unit, the optical path changing unit may include a concave mirror.

According to the eighth embodiment of the optical path changing unit, the optical path changing unit may include a flat mirror. For example, a concave mirror and a flat mirror can be used together to change the light path.

According to the ninth embodiment of the light path changing unit, the light path changing unit may include a polygonal prism. For example, a light path may be changed using a pentagonal prism.

17 shows a first embodiment of the reflector.

18 shows a second embodiment of the reflector.

19 shows a third embodiment of the reflector.

20 shows a fourth embodiment of the reflector.

Referring to FIGS. 17 to 20 , the type of the reflector is not limited as long as it can collect light reflected from an object.

According to the first exemplary embodiment of the reflector, the reflector may include a convex lens. For example, a light path can be changed by using a concave lens and a flat mirror together.

According to the second embodiment of the reflector, the reflector may include a concave mirror. The concave mirror has the property of converging light, and the reflected light can be focused to the focal point of the concave mirror. Also, the size of the concave mirror is not limited.

According to the third embodiment of the reflector, the reflector may use a flat mirror together with a concave mirror.

According to the fourth exemplary embodiment of the reflector, the direction of the receiver may have an inclined shape. For example, it may be disposed in a form capable of simultaneously receiving light reflected from a target outside the vehicle and light reflected from a target inside the vehicle.

21 is a diagram illustrating steps in which light is transferred according to an embodiment of a distance measuring device for a driver monitoring system.

Referring to FIG. 21 , the step 600 of transmitting light in the driver monitoring system may include a transmitter 601, an optical path changer 603, an object 605, a reflector 607, and a receiver 609. can The order of each step can be changed as needed, and is not limited to the shown order of steps.

In the driver monitoring system, the light emitted from the transmission unit 601 is transferred to the light path changer 603, and the light path changer 603 can change the path of the light. The light whose path has been changed through the optical path changing unit 603 is transferred to the target 605 and may generate reflected light. The reflector 607 may receive the reflected light, and the receiver 609 may recognize a signal of the reflected light.

22 is a diagram illustrating a case in which a step of controlling a receiver and a transmitter is added by a control device.

Referring to FIG. 22 , a control device 611 may be additionally included in the driver monitoring system. The type of control device 611 is not limited as long as it can control the transmitter and the receiver.

The control device 611 may recognize the signal of the receiver 609 and control the output of the transmitter 601 .

The controller 611 may recognize the signal of the transmitter 601 and control the measurement of the receiver 609 .

23 is a diagram showing each step of the driver monitoring system.

Referring to FIG. 23 , the driver monitoring system 700 may include a standby mode step 702 , a driver recognition step 704 , a driver confirmation step 706 , and an in-vehicle driver monitoring step 708 .

The standby mode step 702 may monitor the outside of the vehicle. For example, in the standby mode stage, the direction of the camera may face the side of the vehicle. In addition, power can be used at a minimum during the standby mode stage.

In the driver recognition step 704 , a camera may be activated by recognizing a driver outside the vehicle in the first recognition range. When power is used at a minimum in the standby mode step, power output can be increased in the driver recognition step.

In the driver confirmation step 706, the camera may check the face of the driver who has moved from the first recognition range to the second recognition range. The driver confirmation step may further include a step of comparing the face of the set driver and the face of an approaching target, and the vehicle may be unlocked only when the face of the set driver and the face of the target match in the face comparison step. have.

In the monitoring of the driver in the vehicle step 708 , the driver in the vehicle may be monitored when the driver is inside the vehicle. For example, in the driver monitoring step, the direction of the camera may face the driver.

The driver monitoring system 700 may further include a step of ending driving 710 and returning to a standby mode when the engine of the vehicle is turned off.

24 is a diagram showing a first embodiment of a transmitter.

Referring to FIG. 24 , the light diffusing device 800 includes a first diffusion unit 820, a second diffusion unit 830, a cover 840, a support unit 850, an adjusting unit 860, and a body unit 870. , a coil 880, and a magnet 890.

The first diffusion unit 820 may be fixed by the support unit 850 and diffuse light transmitted from the light source 810 including the laser unit 812 . The irregularities formed on the surface of the first diffusion unit 820 may have various shapes and materials, and the angle at which light is diffused may be variously set according to such shapes and materials.

The second diffusion unit 830 is moved by the control unit 860 and can diffuse the light passing through the first diffusion unit at a set radiation angle. The irregularities formed on the surface of the second diffusion unit 830 may have various shapes and materials, and an angle at which light is diffused may be variously set according to such shapes and materials.

The body portion 870 is coupled to the cover 840, and a coil 880 may be formed inside the body portion 870.

The coil 880 may adjust the distance between the first diffusion part and the second diffusion part by interaction with the magnet 890 fixed inside the adjusting part 860 .

A control device (not shown) may control the output of the laser unit 812 in a set area.

The area of the laser unit 812 may be set and divided into a first area and a second area, and the output of the first area and the output of the second area may be individually controlled by a control device (not shown). have.

Among the set areas of the laser unit 812, the output of the second area may be adjusted to be lower than the output of the first area.

The light source 810 may include a first light source unit and a second light source unit.

Among the light sources 810 , the first light source unit may include a Vertical Cavity Surface Emitting Laser (VCSEL) device.

Among the light sources 810, the second light source unit may have a wider beam angle than the first light source unit.

25 is a diagram illustrating a second embodiment of a transmitter.

Referring to FIG. 25 , the positions of the second diffusion part 830, the adjusting part 860, and the magnet 890 may be adjusted up or down.

The distance between the second diffusion part 830 and the first diffusion part 820 is adjusted by the interaction between the coil 880 and the magnet 890, and more specifically, electromagnetic force is generated by the coil 880 through which current flows. And the distance between the second diffusion part 830 and the first diffusion part 820 is adjusted by the interaction of the magnet 890 and the electromagnetic force. The exact distance and movement direction of the second diffusion part 830 and the first diffusion part 820 are determined according to the strength and direction of the current flowing through the coil 880 . Illustratively, the amplification of the electromagnetic field by the coil 880 may adjust the distance according to the piezoelectric effect (piezo effect). In this case, the distance between the second diffusion unit 830 and the first diffusion unit 820 is adjusted, and the direction of the light 801 passing through the light diffusion device 800 can be finally determined.

The direction of the light 1 may be variously determined as a diffusion angle for a long distance or a diffusion angle for a short distance according to the shape of the surfaces of the first diffusion part 820 and the second diffusion part 830, and the radiation angle is limited. It doesn't work.

26 is a diagram showing a third embodiment of a transmitter.

Referring to FIG. 26, the laser unit 812 in the light source 810 may be divided into a first area and a second area, and the output of each area may be individually controlled by a controller (not shown). .

The output of the second region may be lower than that of the first region, and exemplarily, the power of the corresponding region may be turned off so that the output of the second region does not occur.

The area of the laser unit 812 may be divided into two or more areas, and a controller (not shown) may individually control each element as needed.

A control device (not shown) may receive and analyze a signal from the receiver, and the control device may adjust the output of a set area of the laser unit by calculating an adjustment ratio of the output. The controller may derive a function based on the incident charge amount distribution. The output control ratio may be set to a ratio for making the distribution of output uniform.

A control device (not shown) may adjust the output of the laser unit within the saturation range of the receiver unit. Illustratively, the quantitative depth of an object for each distance may be corrected by homogenizing the distribution of a specific area in the central part or a boundary part by using a function that reverses the distribution of the incident charge reflected on a plane at a certain distance as a calculation formula.

A control device (not shown) may adjust the output of a set area of the laser unit according to a set ratio. Exemplarily, the output of the area set in the light diffusing device may have a constant intensity.

10: Distance measuring device
11: transmitter
13: receiver
20: light transmitted from the transmitter
30: reflected light
50: first radiation angle
60: second radiation angle
70: second area
80: first area
90: object
100: system for driver monitoring
110: distance measuring device
150: radiation angle
400: optical path change unit
500: reflector
600: light transmission path
601: transmission unit
603: optical path change unit
605: object
607: reflector
609: receiver
611: controller
700: driver monitoring system
702: standby mode step
704: driver recognition step
706: driver confirmation step
708: In-vehicle driver monitoring step
710: End of operation
800: Diffusion device with adjustable distance
801 light
810: light source
812: laser unit
820: first diffusion unit
830: second diffusion unit
840: cover
850: support
860: control unit
870: body part
880: Coil
890: magnet

Claims (15)

A method for performing driver monitoring through a distance measuring device including a rotating device for transmitting laser light to a target and adjusting a direction of the laser light,
a standby mode step of transmitting the laser light to the outside of the vehicle and detecting an object outside the vehicle;
a driver recognition step of recognizing a driver outside the vehicle in a first recognition range in the standby mode step and activating a camera;
confirming, by the camera, a predetermined part of the driver that has moved from the first recognition range to the second recognition range; and
and changing the irradiation direction of the laser light by operating the rotating device when the driver is inside the vehicle, and monitoring the driver inside the vehicle. According to claim 1,
Sangeo distance measuring device,
Further comprising a control device for adjusting the irradiation angle of the laser light,
Wherein the control device differently controls a field of view (FOV) of an object in the first recognition range and the second recognition range. According to claim 1,
The distance measuring device,
a plurality of lenses tuned for varifocal; and
The driver monitoring method further comprising a control device for controlling focus of the plurality of lenses according to photographing conditions. According to claim 1,
The distance measuring device,
A driver monitoring method comprising adjusting a direction of the laser light through any one of a prism, a beam splitter, an optical fiber, and a concave mirror. delete According to claim 1,
The distance measuring device,
a first diffusion unit fixed by the support unit and diffusing light transmitted from a light source including a laser unit;
a second diffusion unit that is moved by the control unit and diffuses the light passing through the first diffusion unit at a set radiation angle;
body part; and
further comprising a control device;
The coil inside the main body adjusts the distance between the first diffusion part and the second diffusion part by interaction with the magnet fixed inside the adjusting part,
The driver monitoring method according to claim 1 , wherein the control device controls the output of a set area of the laser unit. delete delete delete delete delete According to claim 1,
A method for monitoring a driver, further comprising returning to a standby mode when the engine of the vehicle is turned off. According to claim 1,
In the standby mode step, the direction of the laser light is directed to the side of the vehicle,
In the driver monitoring step, the direction of the laser light is changed by operating the rotating device to face the driver. According to claim 1,
In the standby mode phase, power is used to a minimum,
The driver monitoring method of increasing power output in the driver recognition step. According to claim 1,
The driver recognition step further includes comparing the face of the set driver with the face of an approaching target,
The driver monitoring method, wherein the vehicle is unlocked only when the driver's face set in the face comparison step matches the target's face.

Images