Light reflection device and LiDAR scanning system having the same
A light reflection device is disclosed. The light reflection device according to an exemplary embodiment of the present disclosure includes a first reflector configured to reflect an optical signal emitted from a light output unit to an object, a second reflector configured to reflect the optical signal reflected from the object to a light receiving unit, a blocking plate interposed between the first reflector and the second reflector, a motor configured to rotate at least one of the first reflector, the second reflector, and the blocking plate, and a coupling part configured to couple the first reflector, the second reflector, and the blocking plate so that the first reflector, the second reflector, and the blocking plate rotate at the same angle on the basis of a rotation axis.
1. A light reflection device comprising:
a first reflector configured to reflect an optical signal emitted from a light output unit to an object;
a second reflector configured to reflect the optical signal reflected from the object to a light receiving unit;
a blocking plate interposed between the first reflector and the second reflector;
a motor configured to rotate at least one of the first reflector, the second reflector, and the blocking plate; and
a coupling part configured to couple the first reflector, the second reflector, and the blocking plate so that the first reflector, the second reflector, and the blocking plate rotate at the same angle on the basis of a rotation axis,
wherein the blocking plate includes a first surface and a second surface, which are opposite sides of the blocking plate,
the first reflector is located on the first surface of the blocking plate, and
the second reflector is located on the second surface of the blocking plate, and
wherein the coupling part passes through the first reflector, the second reflector, and the blocking plate.
2. The light reflection device of claim 1 , wherein at least one of the first reflector and the second reflector is formed in a polyhedral shape, and is formed with a recessed region recessed in a direction from one surface to the rotation axis.
3. The light reflection device of claim 1 , wherein the first reflector and the second reflector are formed in the same shape.
4. The light reflection device of claim 1 , wherein the blocking plate is formed in a disk shape.
5. The light reflection device of claim 1 , wherein the coupling part includes a shaft of the motor passing through the first reflector, the second reflector, and the blocking plate, and a first nut coupled to the shaft.
6. The light reflection device of claim 5 , wherein the shaft is formed with a D-cut portion in at least a portion thereof.
7. The light reflection device of claim 1 , wherein the motor is connected to a reflective surface of the first reflector or the second reflector to rotate the first reflector or the second reflector.
8. The light reflection device of claim 7 , wherein the motor is an outer rotor-type motor.
9. The light reflection device of claim 7 , wherein a protruding portion is formed on at least a portion, adjacent to the reflective surface of the first reflector or the second reflector, of a housing of the motor.
10. The light reflection device of claim 9 , wherein a sensor configured to sense rotation is installed in the protruding portion.
11. The light reflection device of claim 7 , wherein a portion of a housing of the motor and the reflective surface of the first reflector or the second reflector are coupled to each other using a first bolt.
12. The light reflection device of claim 1 , wherein the coupling part includes a second bolt passing through the first reflector, the second reflector, and the blocking plate, and a second nut coupled to the second bolt.
13. The light reflection device of claim 12 , wherein the second bolt is formed with a D-cut portion in at least a portion thereof.
14. The light reflection device of claim 1 , wherein the coupling part includes pin members forcibly fit-coupled to a through hole passing through the first reflector, the second reflector, and the blocking plate.
15. The light reflection device of claim 1 , wherein:
the blocking plate is formed in a disk shape;
the light reflection device further includes a mounting part configured to fix the first reflector, the second reflector, the blocking plate, and the motor, which are coupled by the coupling part, to an object to be mounted, and input or output the optical signal only for a predetermined angle range; and
the mounting part includes a wall member formed in a curved shape to correspond to an outer circumferential surface of the blocking plate and provided with a sidewall, which vertically extends, to surround one side portions of the first reflector, the second reflector, and the blocking plate coupled by the coupling part, a shielding member that is a plate material disposed parallel to the ground, is provided with a curved groove corresponding to the outer circumferential surface of the blocking plate protruding from the wall member, and is disposed to be engaged with the blocking plate, and a plate member disposed on or under the wall member and to which the motor is fixed.
16. The light reflection device of claim 15 , wherein:
the plate member is disposed on the wall member; and
the motor is disposed in a form of hanging the ground on one surface of the plate member.
17. The light reflection device of claim 15 , wherein:
a magnet is installed at one side of the motor; and
a sensor configured to detect a change in a magnetic field generated from the magnet to sense a rotation angle of the motor is installed at one side of the plate member.
18. The light reflection device of claim 15 , wherein a protrusion formed to protrude from the sidewall to the outer circumferential surface of the blocking plate by a predetermined length is provided at a position in the sidewall of the wall member corresponding to the outer circumferential surface of the blocking plate.
19. A light detection and ranging (LiDAR) scanning system comprising:
a light reflection device including a first reflector configured to reflect an optical signal emitted from a light output unit to an object, a second reflector configured to reflect the optical signal reflected from the object to a light receiving unit, a blocking plate interposed between the first reflector and the second reflector, a motor configured to rotate at least one of the first reflector, the second reflector, and the blocking plate, and a coupling part configured to couple the first reflector, the second reflector, and the blocking plate so that the first reflector, the second reflector, and the blocking plate rotate at the same angle on the basis of a rotation axis,
wherein the blocking plate includes a first surface and a second surface, which are opposite sides of the blocking plate, the first reflector is located on the first surface of the blocking plate, and the second reflector is located on the second surface of the blocking plate, and
the coupling part passes through the first reflector, the second reflector, and the blocking plate;
the light output unit configured to emit the optical signal to the light reflection device; and
the light receiving unit configured to receive the optical signal reflected from the light reflection device,
wherein the optical signal is pulsed laser.