Optical cross talk mitigation for optical device having disrupting features formed on a shield

Patent metadata

Field	Value
Publication number	US-9851478-B2
Application number	US-201615040872-A
Country	US
Kind code	B2
Filing date	Feb 10, 2016
Priority date	Feb 10, 2016
Publication date	Dec 26, 2017
Grant date	Dec 26, 2017

Abstract

A system and method are disclosed for reducing light from one or more light sources from entering into a light sensor by reflection off of a visor and/or waveguiding within the visor. In embodiments, a shroud may be provided around the light sensor to block light reflected off of the visor from entering the light sensor. In embodiments, pattern of one or more grooves may be formed in the visor to block light waveguided within the visor from entering the light sensor.

First claim

We claim:

1. A system for reducing an amount of light transmitted from a light source of an imaging device to a light sensor of the imaging device by a shield, the light sensor being adjacent to the shield, the system comprising:
optical disrupting features formed in or on a surface of the shield; and
material, opaque to wavelengths emitted by the light source, used in conjunction with the optical disrupting features, the optical disrupting features and opaque material blocking light from the light source from entering the light sensor via waveguiding through the shield.

2. The system of claim 1 , further comprising a shroud around the light sensor, the shroud being opaque to wavelengths emitted by the light source, the shroud preventing light from the light source from being transmitted to the light sensor by reflection off of the shield.

3. The system of claim 1 , wherein the optical disrupting features comprise a pattern of one or more grooves in a surface of the shield.

4. The system of claim 3 , wherein the surface of the shield in which the grooves are formed is a surface of the shield in which the light source is adjacent.

5. The system of claim 1 , wherein the optical disrupting features are formed partially through a thickness of the shield.

6. The system of claim 1 , wherein the optical disrupting features are formed completely through a thickness of the shield.

7. The system of claim 1 , wherein the material is black, optically opaque paint.

8. The system of claim 1 , wherein the material has a higher index of refraction than the shield.

9. The system of claim 1 , wherein the optical disrupting features encircle an area on the surface of the shield to which the light sensor is adjacent.

10. A system for reducing an amount of light transmitted from a light source of an imaging device to a light sensor of the imaging device by a visor, the light source and light sensor being adjacent to the visor, the system comprising:
a pattern of one or more grooves formed in a first area of the visor into a surface of the visor; and
material, opaque to wavelengths emitted by the light source, the material at least partially filling the pattern of one or more grooves, and the material applied to a second area of the visor on the surface of the visor, the pattern of one or more grooves and opaque material blocking light from the light source from entering the light sensor via waveguiding through the visor.

11. The system of claim 10 , further comprising a shroud around the light sensor and lens, the shroud being opaque to wavelengths emitted by the light source, the shroud preventing light from the light source from being transmitted to the light sensor by reflection off of the visor.

12. The system of claim 11 , further comprising a gasket at an interface between the shroud and the light sensor, the gasket being opaque to wavelengths emitted by the light source, the gasket further preventing light from the light source from being transmitted to the light sensor by reflection off of the visor.

13. The system of claim 10 , wherein the surface of the visor in which the grooves are formed is a surface of the visor to which the light source is adjacent.

14. The system of claim 10 , wherein the surface of the visor in which the grooves are formed is a surface of the visor opposite to a surface to which the light source is adjacent.

15. The system of claim 10 , wherein the grooves are formed partially through a thickness of the visor.

16. The system of claim 1 , wherein the material is black paint with an index of refraction higher than an index of refraction of the visor.

17. A method of forming an imaging device for a head mounted display device, the head mounted display device comprising a visor, and the display device comprising a light source and light sensor positioned behind the visor when worn by a user, the method comprising:
(a) forming optical disrupting features on or in a surface of the visor at least partially encircling an area of the visor adjacent to the light sensor; and
(b) applying a material, opaque to wavelengths emitted by the light source, to the optical disrupting features, the optical disrupting features and opaque material blocking light from the light source from entering the light sensor via waveguiding through the visor.

18. The method of claim 17 , further comprising the steps of encircling the light sensor with a shroud and affixing the shroud to the visor using a gasket opaque to wavelengths emitted by the light source, the shroud and gasket preventing light from the light source from being transmitted to the light sensor by reflection off of the visor.

19. The method of claim 17 , said step (a) of forming optical disrupting features comprising the step of forming a pattern of grooves into a surface of the visor.

20. The method of claim 19 , said step of forming a pattern of grooves comprising the step of forming the pattern of grooves by one of raised walls in an injection mold for forming the visor, machining the grooves in the visor after the visor is formed, and lasing the grooves in the visor after the visor is formed.

Assignees

• Microsoft Technology Licensing Llc

Inventors

• Price Raymond Kirk
• Towle Erica Lee
• Nalla Ravi Kiran

Classifications

• G02B2027/0178

  Eyeglass type (eyeglass details G02C) · CPC title

• G02B2027/0138

  comprising image capture systems, e.g. camera · CPC title

• G02B5/003 Primary

  Light absorbing elements · CPC title

• G02B27/0172

  characterised by optical features · CPC title

• G02B27/0018

  with means for preventing ghost images (anti-reflection coatings G02B1/11) · CPC title