Light-receiving device and lidar

Patent metadata

Field	Value
Publication number	US-11965986-B2
Application number	US-202217582586-A
Country	US
Kind code	B2
Filing date	Jan 24, 2022
Priority date	Jul 25, 2016
Publication date	Apr 23, 2024
Grant date	Apr 23, 2024

Abstract

An optical device includes a light receiving element for detecting light reflected and transmitted from a subject; a voltage part for providing a first bias voltage or a second bias voltage to the light receiving element; and a controller for controlling the voltage part so that the second bias voltage provided from the voltage part is synchronized with a light output of a light emitting part to be provided to the light receiving element.

First claim

What is claimed is:

1. An optical device, comprising:
a light receiving element for detecting light reflected and transmitted from a subject;
a voltage part for providing a first bias voltage or a second bias voltage to the light receiving element; and
a controller for controlling the voltage part so that the second bias voltage provided from the voltage part is synchronized with a light output of a light emitting part to be provided to the light receiving element,
wherein the second bias voltage comprises a voltage in which a sub bias voltage is added to the first bias voltage.

2. The optical device of claim 1 , wherein the sub bias voltage is comprised in a range from −50V to +50V.

3. The optical device of claim 1 , wherein the sub bias voltage comprises AC voltage or pulse-shaped voltage that changes with respect to time.

4. The optical device of claim 3 , wherein a median value of the sub bias voltage is positioned between −50V to 100V.

5. The optical device of claim 3 , wherein a shape of the sub bias voltage is changed to a linear shape or a stair shape.

6. The optical device of claim 1 , wherein the controller inputs a seed signal to the light emitting part and the voltage part simultaneously, and
wherein the voltage part outputs the second bias voltage based on a time when the seed signal is inputted.

7. The optical device of claim 1 , wherein the light emitting part comprises at least one laser diode.

8. The optical device of claim 1 , wherein the light receiving element comprises at least one avalanche photo diode.

9. A Lidar module comprising:
a light receiving element for detecting light reflected and transmitted from a subject;
a first voltage part for providing a bias voltage to the light receiving element;
a second voltage part for providing a sub bias voltage to the light receiving element; and
a controller for controlling the second voltage part so that the sub bias voltage is synchronized with a light output of a light emitting part to be provided to the light receiving element.

10. A Lidar module comprising:
a light receiving element for detecting light reflected and transmitted from a subject;
a first voltage part for providing a bias voltage to the light receiving element;
a second voltage part for providing a sub bias voltage to the light receiving element; and
a monitoring photo diode (MPD) for detecting a light output outputted from a light emitting part and controlling the second voltage part so that the sub bias voltage is synchronized with the light output to be provided to the light receiving element.

11. The Lidar module of claim 9 , wherein the sub bias voltage is comprised in a range from −50V to +50V.

12. The Lidar module of claim 9 , wherein the sub bias voltage comprises AC voltage or pulse-shaped voltage that changes with respect to time.

13. The Lidar module of claim 12 , wherein a median value of the sub bias voltage is positioned between −50V to 100V.

14. The Lidar module of claim 12 , wherein a shape of the sub bias voltage is changed to a linear shape or a stair shape.

15. The Lidar module of claim 9 , wherein the light emitting part comprises at least one laser diode.

16. The Lidar module of claim 9 , wherein the light receiving element comprises at least one avalanche photo diode.

17. The Lidar module of claim 16 , wherein the sub bias voltage is changed according to characteristics of the avalanche photo diode.

18. The Lidar module of claim 9 , wherein the controller inputs a seed signal to the light emitting part and the voltage part simultaneously, and
wherein the second voltage part outputs the sub bias voltage based on a time when the seed signal is inputted.

19. The Lidar module of claim 10 , wherein the monitoring photo diode inputs a seed signal to the second voltage part in response to the detected light output, and
wherein the second voltage part outputs the sub bias voltage based on a time when the seed signal is inputted.

Assignees

• Lg Innotek Co Ltd

Inventors

• Lee Chang Hyuck
• Kang Lee Im
• Kim Ji Sung
• Joo Yang Hyun

Classifications

• G01S7/486 Primary

  Receivers · CPC title

• G01S7/4816 Primary

  of receivers alone · CPC title

• G01S7/4865

  Time delay measurement, e.g. time-of-flight measurement, time of arrival measurement or determining the exact position of a peak (peak detection in noise, signal conditioning G01S7/487) · CPC title

• G01S17/14

  wherein a voltage or current pulse is initiated and terminated in accordance with the pulse transmission and echo reception respectively, e.g. using counters · CPC title

• G01S17/89

  for mapping or imaging · CPC title