Transmission unit and lidar device with optical homogenizer

Patent metadata

Field	Value
Publication number	US-2023003843-A1
Application number	US-202017780870-A
Country	US
Kind code	A1
Filing date	Nov 16, 2020
Priority date	Dec 17, 2019
Publication date	Jan 5, 2023
Grant date	—

Abstract

A transmission unit of a LIDAR device. The transmission unit includes at least one beam source for generating electromagnetic beams having a linear or rectangular cross section, and transmission optics. The transmission unit has an optical homogenizer which is arranged in a beam path of the generated beams in front of or behind the transmission optics and has at least one lens array. A LIDAR device is also described.

First claim

1 - 11 . (canceled)

12 . A transmission unit of a LIDAR device, comprising:
at least one beam source configured to generate electromagnetic beams having a linear or rectangular cross section; transmission optics; and an optical homogenizer arranged in a beam path of the generated beams in front of or behind the transmission optics, including at least one lens array.

13 . The transmission unit as recited in claim 12 , wherein the transmission unit includes a homogenization plane arranged in a region of the transmission optics.

14 . The transmission unit as recited in claim 12 , wherein the optical homogenizer includes two lens arrays spaced apart from each other and having a multiplicity of cylindrical microlenses, wherein the cylindrical microlenses are each arranged on a surface of the lens arrays, wherein image planes of the cylindrical microlenses are arranged on a focal plane within a spacing between the lens arrays.

15 . The transmission unit as recited in claim 14 , wherein the lens arrays of the optical homogenizer are arranged in such a way that the surfaces provided with the cylindrical microlenses are directed in a direction of the at least one beam source.

16 . The transmission unit as recited in claim 14 , wherein the lens arrays of the optical homogenizer are arranged in such a way that the surfaces provided with the cylindrical microlenses are directed toward or away from each other.

17 . The transmission unit as recited in claim 12 , wherein the optical homogenizer includes a lens array with a first surface and a second surface, wherein a multiplicity of cylindrical microlenses is arranged on the first surface and the second surface, wherein image planes of the cylindrical microlenses are arranged between the first surface and the second surface.

18 . The transmission unit as recited in claim 17 , wherein the image planes of the cylindrical microlenses are arranged centrally between the first surface and the second surface.

19 . The transmission unit as recited in claim 14 , wherein a number of the cylindrical microlenses and/or a form of the cylindrical microlenses and/or a size of the cylindrical microlenses of the two lens arrays, is configured to be the same as each other or different from each other, and wherein the form of the cylindrical microlenses and/or the size of the cylindrical microlenses within one surface of the lens array is configured to be constant or varying.

20 . The transmission unit as recited in claim 12 , wherein the transmission optics are configured to form a linear illumination.

21 . The transmission unit as recited in claim 12 , wherein the at least one beam source is configured as an array of emitters, wherein the emitters are arranged in such a way that the beams generated by the beam source form a rectangular and/or elongate scanning pattern.

22 . A LIDAR device for scanning a scanning area, comprising:
a transmission unit including:
at least one beam source configured to generate electromagnetic beams having a linear or rectangular cross section,
transmission optics, and
an optical homogenizer arranged in a beam path of the generated beams in front of or behind the transmission optics, including at least one lens array; and
a receiving unit with at least one detector configured to receive beams reflected and/or back-scattered from the scanning area.

Assignees

• Bosch Gmbh Robert

Inventors

• Groening Albert
• Albuquerque Andre
• Schumann Anne
• Pereira Dionisio
• Spiessberger Stefan

Classifications

• G01S17/931

  of land vehicles · CPC title

• G01S17/10

  using transmission of interrupted, pulse-modulated waves (determination of distance by phase measurements G01S17/32) · CPC title

• G01S17/42

  Simultaneous measurement of distance and other co-ordinates (indirect measurement G01S17/46) · CPC title

• G01S7/4815 Primary

  using multiple transmitters · CPC title

• G02B27/0927

  Systems for changing the beam intensity distribution, e.g. Gaussian to top-hat · CPC title