Optical imaging modules and optical detection modules including a time-of-flight sensor

Patent metadata

Field	Value
Publication number	US-10359505-B2
Application number	US-201515124045-A
Country	US
Kind code	B2
Filing date	Mar 13, 2015
Priority date	Mar 14, 2014
Publication date	Jul 23, 2019
Grant date	Jul 23, 2019

Abstract

The present disclosure describes optical imaging and optical detection modules that include sensors such as time-of-flight (TOF) sensors. Various implementations are described that, in some instances, can help reduce the amount of optical cross-talk between active detection pixels and reference pixels and/or can facilitate the ability of the sensor to determine an accurate phase difference to be used, for example, in distance calculations.

First claim

What is claimed is:

1. An optoelectronic module comprising:
an illumination source;
a sensor including spatially distributed detection pixels and at least one reference pixel;
an optics member disposed over the illumination source and the sensor, the optics member having a first transmissive region over the illumination source and a second transmissive region over the detection pixels;
a light barrier separating an emission chamber of the module from a detection chamber of the module, wherein the illumination source and the at least one reference pixel are in the emission chamber, and wherein the detection pixels are in the detection chamber; and
a partially reflective coating on a surface of the first transmissive region over the illumination source wherein the coating is partially reflective with respect to a wavelength detectable by the reference pixel and is arranged such that some light from the illumination source is reflected by the coating toward the at least one reference pixel.

2. The optoelectronic module of claim 1 including a partially reflective coating on a surface of the first transmissive region facing the illumination source.

3. The optoelectronic module of claim 1 including a partially reflective coating on a surface of the first transmissive region facing away from the illumination source.

4. The optoelectronic module of claim 1 including a partially reflective coating on each of opposite surfaces of the first transmissive region.

5. The optoelectronic module of claim 1 including a reflective coating on a surface of the light barrier facing the illumination source.

6. The optoelectronic module of claim 1 wherein the optics member includes a non-transmissive region separating the first and second transmissive regions, the non-transmissive region having a reflective coating on a surface facing the illumination source and arranged such that some light from the illumination source is reflected by the reflective coating toward the at least one reference pixel.

7. An optoelectronic module comprising:
an illumination source;
a sensor including spatially distributed detection pixels and at least one reference pixel;
an optics member disposed over the illumination source and the sensor, the optics member having a first transmissive region over the illumination source and a second transmissive region over the detection pixels, wherein the first transmissive region has a first coating on a first surface facing the illumination source and a second coating on a second surface facing away from the illumination source;
a light barrier separating an emission chamber of the module from a detection chamber of the module, wherein the illumination source and the at least one reference pixel are in the emission chamber, and wherein the detection pixels are in the detection chamber; and
wherein each of the coatings is at least one of an optical filter coating, a partially-reflective coating, an anti-reflective coating or a non-transmissive coating.

8. The optoelectronic module of claim 7 wherein at least one the first or second coating comprises black chrome.

9. The optoelectronic module of claim 7 including a respective black chrome coating on each of opposite surfaces of the first transmissive region.

10. The optoelectronic module of claim 7 wherein each of the one of more surfaces of the first transmissive region has a black chrome coating and an optical filter coating thereon.

11. The optoelectronic module of claim 7 further including a passive optical element mounted on, or incorporated into, the first transmissive window.

12. The optoelectronic module of claim 11 wherein the passive optical element includes at least one of a reflective patch, a diffractive optical element, or a refractive optical element.

Assignees

• Ams Sensors Singapore Pte Ltd

Inventors

• Buettgen Bernhard
• Vaello Paños Miguel Bruno
• Beer Stephan
• Lehmann Michael
• Pérez Calero Daniel
• Godé Sophie
• Hallal Bassam

Classifications

• G01S17/894

  Three-dimensional [3D] imaging with simultaneous measurement of time-of-flight at a two-dimensional [2D] array of receiver pixels, e.g. time-of-flight cameras or flash lidar · CPC title

• G01J1/0422

  using light concentrators, collectors or condensers · CPC title

• G01S7/4918 Primary

  Controlling received signal intensity, gain or exposure of sensor · CPC title

• G01S7/4813 Primary

  Housing arrangements · CPC title

• G01J2001/4247

  for testing lamps or other light sources · CPC title