Ir illuminator with secondary function

Patent metadata

Field	Value
Publication number	US-2020200356-A1
Application number	US-201816225924-A
Country	US
Kind code	A1
Filing date	Dec 19, 2018
Priority date	Dec 19, 2018
Publication date	Jun 25, 2020
Grant date	—

Abstract

An IR illuminator used during the operation of autonomous vehicles, which provides improvement in the performance of cameras used in the vehicle at night time. An optical design of an outer lens of the IR illuminator is selected so that the outer lens forms a beam pattern for the output light from the IR light source, and also acts as a light guide for light emitted from a secondary visible light source, which is located in the same module as the IR light source, and which may be positioned on the same or a different printed circuit board as the IR light source. The material of outer lens is opalescent including scattering bodies. The optical design of the outer lens allows for improved field of view of the IR illuminator.

First claim

1 . An infrared (IR) illuminator device for a vehicle, comprising:
a housing; one or more IR light emitting diodes (LEDs) positioned on a first printed circuit board (PCB) inside the housing to perform IR illumination for the vehicle; and an outer lens at one side of the housing having a first section comprising a first surface and a second surface, and covering the one or more IR LEDs, so that light rays emitted from the one or more IR LEDs are incident on the first surface, are refracted through the body and exit through the second surface, wherein the outer lens is made of an opalescent material and includes scattering bodies therein, and the first and second surfaces of the outer lens have a free form profile so that the field of view (FOV) of the emitted light is increased from 140° to 180°.

2 . The IR illuminator device according to claim 1 , wherein
the outer lens comprises a second section which receives light from a secondary light source positioned on a second PCB inside the housing and guides the received light through the body of the outer lens to exit the second surface of the outer lens.

3 . The IR illuminator device according to claim 2 , wherein
the secondary light source comprises a plurality of LEDs.

4 . The IR illuminator device according to claim 3 , wherein
the plurality of LEDs emit light in the visible wavelength range.

5 . The IR illuminator device according to claim 2 , wherein
the second PCB is the same as the first PCB.

6 . The IR illuminator device according to claim 2 , further comprising
a light guide section, separate from the outer lens, which guides light emitted from the one or more IR LEDs to the first surface of the outer lens.

7 . The IR illuminator device according to claim 2 , wherein
the second section receives light exterior to the IR illuminator device and guides the received light through the body of the outer lens to a sensor positioned on a third PCB.

8 . The IR illuminator device according to claim 2 , wherein
the light emitted by the secondary light source is arranged to perform one of a plurality of secondary operations for the vehicle operation, including: indication of autonomous mode of operation of the vehicle, warning signaling, side marking signaling.

9 . The IR illuminator device according to claim 8 , wherein
the secondary light source emits light in the cyan wavelength range or white light to indicate autonomous operation of the vehicle.

10 . The IR illuminator device according to claim 8 , wherein
the secondary light source emits light in the red wavelength range to indicate rear side marking, tail marking, or stop signaling.

11 . The IR illuminator device according to claim 8 , wherein
the secondary light source emits light in the yellow wavelength range to indicate front side marking.

12 . The IR illuminator device according to claim 1 , wherein
four IR LEDs are positioned on the first PCB inside the housing.

13 . The IR illuminator device according to claim 2 , wherein
the IR illumination due to the one or more IR LEDs and the secondary operation due to the secondary light source are performed independently.

14 . The IR illuminator device according to claim 7 , wherein
the received exterior light includes high speed data transmitted to the vehicle or ambient light.

15 . An Autonomous Vehicle (AV) comprising:
a sensor system including a vision camera; and one or more infrared (IR) illuminator devices, the one or more IR illuminator devices including: a housing, one or more IR light emitting diodes (LEDs) positioned on a first printed circuit board (PCB) inside the housing to perform IR illumination for the AV, and an outer lens at one side of the housing having a first section comprising a first surface and a second surface, and covering the one or more IR LEDs, so that light rays emitted from the one or more IR LEDs are incident on the first surface, are refracted through the body and exit through the second surface, wherein the outer lens is made of an opalescent material and includes scattering bodies therein, and the first and second surfaces of the outer lens have a free form profile so that the field of view (FOV) of the emitted light is increased from 140° to 180°, the one or more IR illuminator devices being positioned relative to the vision camera linearly or in an arc.

16 . The AV according to claim 15 , wherein
the outer lens comprises a second section which receives light from a secondary light source positioned on a second PCB inside the housing and guides the received light through the body of the outer lens to exit the second surface of the outer lens.

17 . The AV according to claim 16 , the IR illuminator further comprising
a light guide section separate from the outer lens that guides light emitted from the one or more IR LEDs to the first surface of the outer lens.

18 . The AV according to claim 16 , wherein
the second section receives light exterior to the one or more IR illuminator devices and guides the received light through the body of the outer lens to a sensor positioned on a third PCB.

19 . The AV according to claim 16 , wherein
the light emitted by the secondary light source is arranged to perform one of a plurality of secondary operations for the AV operation, including: indication of autonomous mode of operation of the AV, warning signaling, side marking signaling.

20 . The AV according to claim 16 , wherein
the secondary light source comprises a plurality of visible LEDs.

Assignees

• Valeo North America Inc

Inventors

• Potter Brant
• Orisich John

Classifications

• H04N23/20

  for generating image signals from infrared radiation only · CPC title

• F21S41/13 Primary

  Ultraviolet light; Infrared light · CPC title

• B60Q1/507

  specific to autonomous vehicles · CPC title

• B60Q1/543

  for indicating other states or conditions of the vehicle (indicating taxis' state of hire or fare G07B13/045) · CPC title

• F21S43/315

  using total internal reflection · CPC title