Optical arrangement of smart glasses for scanning surface

Patent metadata

Field	Value
Publication number	US-11947112-B2
Application number	US-202118030818-A
Country	US
Kind code	B2
Filing date	Oct 12, 2021
Priority date	Oct 20, 2020
Publication date	Apr 2, 2024
Grant date	Apr 2, 2024

Abstract

An optical arrangement of data smart glasses includes a first laser device configured to emit a projection light beam, a second laser device configured to emit a measuring light beam, a first scanner, a second scanner, and a beam combiner configured to bundle the projection light beam and the measuring light beam into a common light beam, wherein the first scanner is configured to deflect the projection light beam emitted by the first laser device in a first axis, and wherein the second scanner is configured to deflect the common light beam focused by the beam combiner in a second axis.

First claim

The invention claimed is:

1. An optical arrangement for smart glasses, comprising:
a first laser device configured to emit a projection light beam;
a second laser device configured to emit a measuring light beam;
a beam splitter configured and arranged to split the measuring light beam into at least two separate measuring light beams;
a first scanner,
a second scanner; and
a beam combiner configured to combine the projection light beam and the measuring light beam into a common light beam,
wherein the first scanner is configured to redirect the projection light beam emitted by the first laser device in a first axis
wherein the second scanner is configured to redirect the common light beam emitted by the beam combiner in a second axis, and
wherein a plurality of measuring light beams emitted from the second laser device and the beam splitter are aligned to produce an interlaced line pattern of scan lines on a surface to be scanned.

2. The optical arrangement according to claim 1 , wherein the first scanner is configured to scan the projection light beam at a first scanning frequency, wherein the second scanner is configured to scan the common light beam at a second scanning frequency, and wherein the second scanning frequency is smaller than the first scanning frequency.

3. The optical arrangement according to claim 1 , wherein the first laser device comprises a projection unit configured to project an image onto a retina of an eye of a user using the projection light beam.

4. The optical arrangement according to claim 1 , wherein the second laser device comprises a viewing detection unit configured to determine an optical path length of the measuring light beam based on laser feedback interferometry of the measuring light beam with a backscattered portion of the measuring light beam from an eye, and to determine a viewing direction of the eye based on the optical path length.

5. The optical arrangement according to claim 1 , wherein the first scanner and/or the second scanner comprises a micro mirror actuator.

6. The optical arrangement according to claim 1 , wherein the beam combiner comprises a polarization beam splitter, and wherein the projection light beam and the measuring light beam are polarized perpendicular to each other.

7. The optical arrangement according to claim 1 , wherein the beam combiner comprises a holographic optical element which is designed to deflect the projection light beam and the measuring light beam at different angles.

8. The optical arrangement according to claim 1 , wherein the second laser device is configured to emit a plurality of separate measuring light beams.

9. The optical arrangement according to claim 8 , further comprising a holographic optical element having a first holographic segment and a second holographic segment, wherein the two holographic segments are formed such that a first scanning direction of a measuring light beam deflected at the first holographic segment is inclined at an angle in relation to a second scanning direction of a measuring light beam deflected at the second holographic segment.

10. The optical arrangement according to claim 1 , wherein the beam splitter:
is integrated into the second laser device;
is arranged on the second laser device;
is integrated into the beam combiner; or
is integrated into a deflecting element provided for deflecting the measuring light beam.

11. The optical arrangement according to claim 1 , wherein the second laser device comprises at least one surface emitter with integrated photodiode.

12. A pair of smart glasses comprising the optical arrangement according to claim 1 , wherein the optical arrangement is arranged on an eyeglass temple.

13. The pair of smart glasses according to claim 12 , further comprising an eyeglass lens with a holographic optical deflection element, wherein the holographic optical deflection element is configured to deflect all light beams emitted by the optical arrangement towards an eye of a user of the pair of smart glasses.

Assignees

• Bosch Gmbh Robert
• Trumpf Photonic Components Gmbh

Inventors

• Petersen Andreas
• Schlebusch Thomas Alexander
• Spruit Hans
• Hellmig Jochen

Classifications

• G02B27/017 Primary

  Head mounted · CPC title

• G02B27/18

  for optical projection, e.g. combination of mirror and condenser and objective {(photographic, cine and overhead projectors G03B21/00; photographic projection printing G03B27/32; photolithographic projectors G03F7/20; projection television H04N5/74; colour projection television H04N9/31)} · CPC title

• G02B27/283

  used for beam splitting or combining · CPC title

• G02B2027/0105

  Holograms with particular structures · CPC title

• G02B2027/0174

  holographic · CPC title