US 11,442,283 B1Granted

Eye safe light source package

AssigneeAmazon Technologies, Inc.

InventorsZachary Whitman-Allen, Xiaodong Xun

Life of this patent

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Abstract

Techniques for reducing the risk for an unsafe eye condition associated with light sources. In an example, a light source package is described. The light source package includes a package body defining an interior volume and including an opening. The package also includes a light source contained inside the interior volume of the package body. The package also includes an optical element that occupies at least a portion of the opening of the package body. An electrically conductive material is disposed over a surface of the optical element. This material may be electrically coupled with a system. The system accesses an electrical parameter of the material, determines a damage associated with the optical element based on the electrical parameter, and initiates a corrective action associated with the light source based on the damage.

Claims20

Dependent claims

An optical projection system comprising:

a substrate;
a light source package comprising:
a package body comprising a set of walls that are disposed along a first direction and that define an opening, a base that extends from the set of walls along a second direction and that is mounted to the substrate, a substrate interface disposed on an external surface of the base and that is electrically coupled to the substrate, and a conductive path that is electrically coupled to the substrate interface, the conductive path comprising a first portion disposed on the external surface of the base and electrically coupled to the substrate interface, the conductive path further comprising a second portion disposed on a surface of a wall of the set of walls;
a laser diode disposed on an internal surface of the base and electrically coupled to the substrate via the substrate interface;
a diffuser that occupies at least a portion of the opening of the package body and that is optically transparent to light emitted from the laser diode, the diffuser including an internal surface facing the laser diode and an opposing external surface;
and
an indium tin oxide (ITO) layer that is disposed over the external surface of the diffuser and that is electrically coupled to the substrate interface via the conductive path;
and
a controller electrically coupled to the ITO layer and configured to:
detect a change in electrical resistance of the ITO layer;
determine that the change is larger than a threshold;
determine that the diffuser is damaged based at least in part on the change being larger than the threshold;
and
turn off power to the laser diode based at least in part on the diffuser being damaged.

11 more elements

A light source package comprising:

a package body defining an interior volume and comprising an opening, a base opposite to the opening, a substrate interface included on an external surface of the base and outside the package body, and a conductive path electrically coupled to the substrate interface;
a light source disposed inside the interior volume on an inside surface of the base, the inside surface being opposite to the external surface, the light source electrically coupled to the substrate interface and configured to emit light;
an optical element that occupies at least a portion of the opening of the package body, the optical element comprising a surface that is optically transparent to the light;
and
an electrically conductive material disposed over the surface of the optical element and electrically coupled to the substrate interface via the conductive path.

2 more elements

A device comprising:

a light source package comprising:
a package body defining an interior volume and comprising an opening, a base opposite to the opening, a substrate interface included on an external surface of the base and outside the package body, and a conductive path electrically coupled to the substrate interface;
a light source disposed inside the interior volume of the package body on an inside surface of the base, the inside surface being opposite to the external surface, the light source electrically coupled to the substrate interface and configured to emit light;
an optical element that occupies at least a portion of the opening of the package body, the optical element comprising a surface that is optically transparent to the light;
and
an electrically conductive material disposed over the surface of the optical element and electrically coupled to the substrate interface via the conductive path;
and
a controller electrically coupled to the substrate interface and configured to detect a damage to the optical element based at least in part on a change to an electrical parameter of the electrically conductive material.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/029,359Filed 6 Jul 2018
Granted: 13 Sep 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

G02B 27/20
For optical projection, e.g. combination of mirror and condenser and objective: for imaging minute objects, e.g. light-pointer
H01S 5/02257
Out-coupling of light: using windows, e.g. specially adapted for back-reflecting light to a detector inside the housing
H01S 5/06825
Stabilisation of laser output parameters: protecting the laser, e.g. during switch-on/off, detection of malfunctioning or degradation
H01S 5/18305
Having only vertical cavities, e.g. vertical cavity surface-emitting lasers [VCSEL]: with emission through the substrate, i.e. bottom emission

Family

No related US applications are recorded in the indexed filing history.

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