Method for controlling a micro-mirror scanner, and micro-mirror scanner

Patent metadata

Field	Value
Publication number	US-10222459-B2
Application number	US-201414917848-A
Country	US
Kind code	B2
Filing date	Aug 14, 2014
Priority date	Sep 27, 2013
Publication date	Mar 5, 2019
Grant date	Mar 5, 2019

Abstract

A micromirror scanner and a method for controlling a micromirror scanner. The method includes furnishing a shot pattern which has at least information regarding first control application signals as a function of mirror positions of a displaceable micromechanical mirror of the micromirror scanner, which are designated to control a light source of the scanner; determining a mirror position of the mirror; emitting light beams into a solid angle; measuring light beams reflected at an object in the solid angle to determine a distance between the object and the scanner; determining a nature or position of the object with respect to the scanner as a function of the determined distance and the determined current mirror position; and adapting the shot pattern as a function of the position and/or nature of the object.

First claim

What is claimed is:

1. A method for controlling a micromirror scanner, comprising the following method steps:
obtaining an image of a first pattern of points;
performing an image processing of the obtained image to identify the points of the image;
analyze the identified points of the image to extract instructions regarding control of a light source of the microscanner as a function of mirror positions of a displaceable micromechanical mirror of the micromirror scanner;
determining a current mirror position of the micromechanical mirror;
based on the determined current mirror position of the micromechanical mirror and the instructions extracted by the analysis of the identified points, controlling the light source to emit ting light beams to the micromechanical mirror in a manner by which the light beams are deflected by the micromechanical mirror into a solid angle;
using a light sensor of the micromirror scanner, measuring light beams reflected by an object in the solid angle;
determining information about the object based on the measured light beams;
based on the determined information about the object, obtaining an image of a second pattern of points that is different than the first pattern of points; and
controlling the light source based on the obtained image of the second pattern of points.

2. The method as recited in claim 1 , further comprising:
controlling the displaceable micromechanical mirror to cyclically travel through a defined sequence of mirror positions, wherein the determination of the current mirror position is based on the control of the mirror to cyclically travel through the defined sequence of mirror positions.

3. The method as recited in claim 2 , further comprising, during operation of the micromirror scanner, modifying the defined sequence of mirror positions through which the displaceable micromechanical mirror is controlled to cyclically travel based on signals of an external sensor, a user input, or both the signals of the external sensor and the user input.

4. The method as recited in claim 1 , further comprising, based on signals of an external sensor, a user input, or both the signals of the external sensor and the user input, obtaining an image of a third pattern of points during operation of the micromirror scanner.

5. The method as recited in claim 1 , wherein the first pattern of points defines a first plurality of the light beams to be generated as a function of first mirror positions that are traveled through successively in a continuously connected fashion, the light beams of the first plurality being separated from one another in time by first identical time intervals.

6. The method as recited in claim 5 , wherein the second pattern of points defines a second plurality of the light beams to be generated as a function of the mirror positions that are traveled through successively in the continuously connected fashion, the light beams of the second plurality being separated from one another in time by second identical time intervals that are shorter or longer than the first identical time intervals.

7. The method as recited in claim 5 , wherein the second pattern of points defines a second plurality of the light beams to be generated (a) as a function of the mirror positions that are traveled through successively in the continuously connected fashion, and (b) with a wider or narrower beam shape than the light beams of the first plurality of the light beams.

8. The method as recited in claim 5 , wherein the second pattern of points defines a second plurality of the light beams to be generated (a) as a function of the mirror positions that are traveled through successively in the continuously connected fashion, and (b) with a higher or a lower radiation power level than the light beams of the first plurality of the light beams.

9. The method as recited in claim 1 , wherein the determining of the information about the object includes:
determining, based on the measured light beams, a distance between the object and the micromirror scanner; and
determining, based on the determined distance and the determined current mirror position of the micromechanical mirror, a position of the object relative to the microscanner, a characteristic of the object, or both the position and the characteristic of the object, based on which the image of the second pattern of points is obtained.

10. The method as recited in claim 1 , wherein the analysis includes identifying intervals between output of light beams by the light source based on a spacing between the points of the first pattern of points.

11. The method as recited in claim 1 , wherein the analysis includes identifying respective powers at which respective ones of the light beams are to be emitted by the light source based on respective shadings of respective ones of the points of the first pattern, which each corresponds to a respective one of the light beams.

12. The method as recited in claim 1 , wherein the analysis includes identifying respective beam shapes of respective ones of the light beams to be emitted by the light source based on respective colors of respective ones of the first pattern, which each corresponds to a respective one of the light beams.

13. A micromirror scanner comprising:
a displaceable micromechanical mirror;
a light source;
a light sensor; and
processing circuitry;
wherein the processing circuitry is configured to:
obtain an image of a first pattern of points;
perform an image processing of the obtained image to identify the points of the image;
analyze the identified points of the image to extract instructions regarding control of the light source as a function of mirror positions of the mirror;
based on a current position of the mirror and the extracted instructions, control the light source to emit light beams to the mirror in a manner by which the light beams are deflected by the mirror into a solid angle;
based on output of the light sensor, measure light beams reflected by an object in the solid angle;
determine information about the object based on the measured light beams;
based on the determined information about the object, obtain an image of a second pattern of points that is different than the first pattern of points; and
control the light source based on the obtained image of the second pattern of points.

14. The micromirror scanner as recited in claim 13 , wherein the processing circuitry includes an image processor ASIC configured to perform the image processing.

Assignees

• Bosch Gmbh Robert

Inventors

• Sparbert Jan
• Fischer Frank
• Schatz Frank

Classifications

• G01S7/4802

  using analysis of echo signal for target characterisation; Target signature; Target cross-section · CPC title

• G01S7/4817 Primary

  relating to scanning · CPC title

• G01S17/89

  for mapping or imaging · CPC title