LIGHT PROJECTING METHOD AND DEVICE
First Claim
1. A light projecting system, comprising:
- a waveguide comprising a first surface, a second surface, and a fourth surface, at least one of the first surface or the second surface comprising a first plurality of grating structures;
a light source coupling light into the waveguide to form an in-coupled light beam, wherein;
the waveguide is configured to guide the in-coupled light beam to undergo total internal reflection between the first surface and the second surface until reaching the fourth surface, andeach of the first grating structures is configured to disrupt the total internal reflection to cause at least a portion of the in-coupled light beam to couple out of the waveguide, the portion of the in-coupled light beam coupled out of the waveguide being an out-coupled light beam, and a remainder beam of the in-coupled light beam undergoing the total internal reflection being coupled out of the waveguide from the fourth surface after the out-coupling at each of the first grating structures; and
a detector configured to receive and measure the remainder beam, wherein the light source or a light blocker at least decreases the strength of the in-coupled light beam in response to the remainder beam exceeding a threshold.
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Accused Products
Abstract
A light projecting system comprises: a waveguide comprising a first surface, a second surface, and a fourth surface, at least one of the first surface or the second surface comprising a first plurality of grating structures; a light source coupling light into the waveguide to form an in-coupled light beam, wherein: each of the first grating structures is configured to disrupt the total internal reflection to cause at least a portion of the in-coupled light beam to couple out of the waveguide, and a remainder beam of the in-coupled light beam undergoing the total internal reflection being coupled out of the waveguide after the out-coupling at each of the first grating structures; a detector configured to receive and measure the remainder beam; and a processor coupled to the detector and configured to determine if a dangerous condition occurs based on the measured remainder beam.
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Citations
20 Claims
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1. A light projecting system, comprising:
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a waveguide comprising a first surface, a second surface, and a fourth surface, at least one of the first surface or the second surface comprising a first plurality of grating structures; a light source coupling light into the waveguide to form an in-coupled light beam, wherein; the waveguide is configured to guide the in-coupled light beam to undergo total internal reflection between the first surface and the second surface until reaching the fourth surface, and each of the first grating structures is configured to disrupt the total internal reflection to cause at least a portion of the in-coupled light beam to couple out of the waveguide, the portion of the in-coupled light beam coupled out of the waveguide being an out-coupled light beam, and a remainder beam of the in-coupled light beam undergoing the total internal reflection being coupled out of the waveguide from the fourth surface after the out-coupling at each of the first grating structures; and a detector configured to receive and measure the remainder beam, wherein the light source or a light blocker at least decreases the strength of the in-coupled light beam in response to the remainder beam exceeding a threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A light projecting method implementable by a light projecting system comprising a light source, a waveguide, and a detector, the light projecting method comprising:
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coupling light from the light source into the waveguide to form an in-coupled light beam, wherein the waveguide comprises a first surface, a second surface, and a fourth surface, and wherein at least one of the first surface or the second surface comprises a first plurality of grating structures; guiding, by the waveguide, the in-coupled light beam to undergo total internal reflection between the first surface and the second surface until reaching the fourth surface, wherein each of the first grating structures disrupts the total internal reflection to cause at least a portion of the in-coupled light beam to couple out of the waveguide, the portion of the in-coupled light beam coupled out of the waveguide being an out-coupled light beam; and receiving and measuring, by the detector, a remainder beam, wherein the light source or a light blocker at least decreases the strength of the in-coupled light beam in response to the remainder beam exceeding a threshold, wherein the remainder beam is a remainder of the in-coupled light beam undergoing the total internal reflection that couples out of the waveguide from the fourth surface after the out-coupling at each of the first grating structures. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification