Systems, devices, and methods for laser projectors

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	Systems, devices, and methods for laser projectors
其他题名	Systems, devices, and methods for laser projectors
	XU, KAI
	2018-04-26
专利权人	NORTH INC.
公开日期	2018-04-26
授权国家	美国
专利类型	发明申请
摘要	Laser safety systems, devices, and methods for use in laser projectors are described. A laser projector includes any number of laser diodes that each emit laser light, a shared laser diode power source, a photodetector to detect a power/intensity of a portion of the laser light, a beam splitter to direct a first portion of the light towards the photodetector and a second portion of the light towards an output on the projector, and a laser safety circuit responsive to signals from the photodetector. The laser safety circuit selectively electrically couples/uncouples the laser diodes from the power source depending on the power/intensity of the laser light detected by the photodetector. Particular applications of the laser safety systems, devices, and methods in a wearable heads-up display are described.
其他摘要	描述了用于激光投影仪的激光安全系统，设备和方法。激光投影仪包括各自发射激光的任意数量的激光二极管，共享的激光二极管功率源，检测激光的一部分的功率/强度的光检测器，将光的第一部分朝向光检测器和光的第二部分朝向投影仪上的输出，以及响应于来自光电检测器的信号的激光安全电路。激光安全电路根据由光电检测器检测到的激光的功率/强度来选择性地将激光二极管与电源电耦合/解耦。描述了激光安全系统，装置和方法在可佩戴平视显示器中的特定应用。
主权项	A method of operating a laser projector, the method comprising: providing power to at least one laser diode by a power source electrically coupled to the at least one laser diode; generating a laser light by the at least one laser diode; splitting the laser light into a first portion and a second portion by a beam splitter; directing the first portion of the laser light from the at least one laser diode along a first optical path towards a photodetector by the beam splitter; directing the second portion of the laser light from the at least one laser diode along a second optical path towards an output of the laser projector by the beam splitter; detecting the first portion of the laser light by the photodetector; outputting a signal by the photodetector in response to detecting the first portion of the laser light by the photodetector, the signal indicative of a power of the laser light generated by the at least one laser diode; receiving the signal from the photodetector by a laser safety circuit communicatively coupled to the photodetector, wherein the laser safety circuit includes a switch that mediates the electrical coupling between the power source and the at least one laser diode; and in response to the signal from the photodetector indicating that the power of the laser light generated by the at least one laser diode exceeds a threshold, interrupting, by the switch, a supply of power to the at least one laser diode from the power source.
申请日期	2017-12-12
专利号	US20180115755A1
专利状态	授权
申请号	US15/839058
公开（公告）号	US20180115755A1
IPC 分类号	H04N9/31 \| G02B27/01 \| H01S5/00
专利代理人	-
代理机构	-
文献类型	专利
条目标识符	http://ir.opt.ac.cn/handle/181661/51761
专题	半导体激光器专利数据库
作者单位	NORTH INC.
推荐引用方式 GB/T 7714	XU, KAI. Systems, devices, and methods for laser projectors. US20180115755A1[P]. 2018-04-26.