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Method and system device applied to using field of high-brightness laser projection machine and used for protecting human eyes

A laser projector and system device technology, applied in the field of laser projection, can solve problems such as human eye damage, and achieve the effect of fast response time

Active Publication Date: 2014-02-12
BARCO VISUAL (BEIJING) ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For beams of Class3R and above safety levels, the self-protection mechanism of the human eye is not enough to provide sufficient protection, and the beam may cause damage to the human eye within 250ms

Method used

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  • Method and system device applied to using field of high-brightness laser projection machine and used for protecting human eyes
  • Method and system device applied to using field of high-brightness laser projection machine and used for protecting human eyes
  • Method and system device applied to using field of high-brightness laser projection machine and used for protecting human eyes

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Embodiment Construction

[0051] In the application of the present invention, one or more ultrasonic sensor units are used to monitor the projected area in real time. During the projection process, when someone crosses the safe distance and enters the dangerous area, the system judges the distance information and the approximate shape of the person detected by the ultrasonic sensor in real time, and makes a control action to let the projector turn off the light output or reduce the output brightness. Keep the human eye from being exposed to the dangerous projection beam at all times. When the person walks out of the dangerous area and is outside the safe distance, the system resumes the normal projection based on the real-time distance information. In this way, when people are within the safe range of the projection area, usually within a range close to the projection screen, the normal projection display will not be affected in any way. The principle of this application is like adding a virtual fence...

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Abstract

A method and a device which are applied to the using field of a high-brightness laser projection machine and used for protecting human eyes are characterized in that a sensor is utilized to monitor a projecting light beam area of the high-brightness laser projection machine, a virtual fence is built in a hard-light dangerous area, and anyone is effectively prevented from entering the dangerous area by means of the method and the device; preferably, an ultrasonic wave sensor is utilized for detecting a human or an object in the projection area; a controller is used for collecting emission and return time of ultrasonic waves, the specific position of the human or the object in the front area is calculated and a shape and a size of the front object are generally analyzed and judged, and a passive infrared sensor provides judgment data about whether the object is lived; and when the controller judges that an object which is harmful to the human or the human eyes is located within a safe distance of the projection machine, a command is sent to the projection machine, so that the projecting light beam output is closed or the output brightness is reduced, the human eyes avoid injury caused by hard lights, or otherwise, normal projection display is not influenced.

Description

Technical field: [0001] The invention belongs to the technical field of laser projection, and relates to a technical application and a device for protecting human eyes from strong light damage in high-brightness front-projection projectors using laser light sources and high-brightness front-projection projectors using other light sources. Background technique: [0002] Laser (Laser) is the abbreviation of Light Amplification by Stimulated Emission of Radiation. It is a high-intensity light source with narrow spectrum and good directionality. With the development of miniaturized and high-power semiconductor laser diode technology in recent years, laser, as a new type of light source, has begun to be used in the field of projection technology. Compared with traditional light sources for projectors, such as ultra-high pressure mercury lamps (UHP) and xenon lamps, laser light sources have the advantages of rich color gamut, high reliability, and long life. However, as a concent...

Claims

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Application Information

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IPC IPC(8): G03B21/14
Inventor 沈宝利张成初刘文星
Owner BARCO VISUAL (BEIJING) ELECTRONICS CO LTD
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