Optical configurations for head worn computing

Patent metadata

Field	Value
Publication number	US-9377625-B2
Application number	US-201414194500-A
Country	US
Kind code	B2
Filing date	Feb 28, 2014
Priority date	Jan 21, 2014
Publication date	Jun 28, 2016
Grant date	Jun 28, 2016

Abstract

Aspects of the present invention relate to optical systems in head worn computing.

First claim

We claim:

1. A head-worn computer, comprising:
a. an image light production facility including a platform including a plurality of multi-positional mirrors;
b. a lighting facility positioned along a side of the platform and adapted to produce polarized illumination light, with a first polarization state, along an optical axis directed away from a front surface of the platform and towards a substantially flat polarized reflective surface that reflects the illumination light such that the front surface of the platform is substantially uniformly illuminated;
c. wherein each of the multi-positional mirrors has a first state positioned to reflect portions of the illumination light, forming image light, on an optical axis in-line with an eye of a person wearing the head-worn computer;
d. a quarter wave retarder positioned over the plurality of multi-positional mirrors and between the substantially flat polarized reflective surface and the platform, so that the polarization state of the image light is opposite of the polarized illumination light, and as a result the image light is transmitted by the substantially flat polarized reflective surface; and
e. a holographic mirror in-line with the optical axis in-line with the eye of the person wearing the head-worn computer and positioned on an angle with respect to a front surface of the platform to reflect the image light directly, without further reflections, towards the eye of the person wearing the head-worn computer.

2. The head-worn computer of claim 1 , wherein the angle is greater than 45 degrees.

3. The head-worn computer of claim 1 , wherein the holographic mirror is adapted to reflect a plurality of visible bandwidths of light and transmit substantially all other visible bandwidths other than the plurality of reflected visible bandwidths of light.

4. The head-worn computer of claim 3 , wherein the holographic mirror transmits a majority of surrounding environment light incident on the holographic mirror.

5. The head-worn computer of claim 3 , wherein the lighting facility produces a narrow bandwidth of light with a quantum dot illumination facility.

6. The head-worn computer of claim 3 , wherein the lighting facility produces a narrow bandwidth of light with a light emitting diode lighting facility.

7. The head-worn computer of claim 3 , wherein the lighting facility produces a diffuse cone of light with a backlit illumination facility.

8. The head-worn computer of claim 1 , wherein each of the multi-positional mirrors have a second state positioned to reflect portions of the illumination light on an optical axis off-line with the eye of the person wearing the head-worn computer, wherein the off-line optical axis terminates at a light absorption facility.

9. The head-worn computer of claim 1 , further comprising an eye imaging camera positioned to image the eye of the person wearing the head-worn computer by capturing light reflected off a subset of the plurality of mirrors wherein the subset of the plurality of mirrors are in a second state.

10. A head-worn computer, comprising:
a. an image light production facility including a platform including a plurality of multi-positional mirrors;
b. a lighting facility positioned along a side of the platform and adapted to produce polarized illumination light, with a first polarization state, along an optical axis directed away from a front surface of the platform and towards a substantially flat polarized reflective surface that reflects the illumination light such that the front surface of the platform is substantially uniformly illuminated;
c. wherein each of the multi-positional mirrors has a first state positioned to reflect portions of the illumination light, forming image light, on an optical axis in-line with an eye of a person wearing the head-worn computer;
d. a quarter wave retarder positioned over the plurality of multi-positional mirrors and between the substantially flat polarized reflective surface and the platform, so that the polarization state of the image light is opposite of the polarized illumination light, and as a result the image light is transmitted by the substantially flat polarized reflective surface; and
e. a notch mirror in-line with the optical axis in-line with the eye of the person wearing the head-worn computer and positioned on an angle with respect to a front surface of the platform to reflect the image light directly towards the eye of the person wearing the head-worn computer.

Assignees

• Osterhout Group Inc

Inventors

• Border John N
• Haddick John D

Classifications

• G02B27/0093

  with means for monitoring data relating to the user, e.g. head-tracking, eye-tracking · CPC title

• G02B27/286

  for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another (G02B5/3083 takes precedence; light guide coupling means utilising polarising elements G02B6/34) · CPC title

• G02B2027/0178

  Eyeglass type (eyeglass details G02C) · CPC title

• G02B2027/0174

  holographic · CPC title

• G06F3/013

  Eye tracking input arrangements (G06F3/015 takes precedence) · CPC title