The laser is also a great invention ofhuman being. Laser is a kind of special and dazzling light, however, if thelaser light into the skin, may be injured, if into the eye, can lead toblindness. That use a variety of ways to control the laser beam prohibit directexposure to the human body, after material surface scattering of laser to humaneyes is also harmful. Human eye long exposure in the strong scattering lightenvironment, will cause the vitreous turbidity and ultimately affect vision,for those who are often exposed to laser set performance and staff have directcontact with the laser, laser protective and protection is very necessary.Laser protective glasses is based on the background.
Traditional laser protective glasses, met aperson may feel it is not strange, it is the same as we commonly known as thesunglasses principle of basic, allowing certain wavelength passes into the eye(or color) of light transmission, other light wavelength (or color), especiallyharmful laser absorbed by the lens itself and filtered, thus play a role toprotect the human eye. For example, common wavelength of 532 nm (nm) greenlaser hit the surface, because the human eye is more sensitive to its,therefore, the laser as long as a little brightness, we will feel dazzling,time is long will feel dry eyes. If we put on a red lens glasses, scatteringthe green light of laser to human eyes can be greatly attenuation, gentle eyeswill feel a lot. If the quality is good protective goggles, green can be thelens degree of attenuation to the eyes almost imperceptible.
The laser protective goggles for aparticular wavelength attenuation degree is to use OD (Optical Density OpticalDensity) to characterization, the parameter value, the greater the show thatthe stronger the attenuation effect of the laser, but even if no matter howhigh, also cannot achieve hundred attenuation, therefore, when it comes to thestrong scattering laser, or there will be a part of the laser protectivegoggles through the lens into the eyes. In some cases, even there are severaldifferent color (wavelength) of strong laser exist at the same time, althoughthe neutral attenuation piece of protective goggles to different wavelengths oflaser attenuation at the same time, but the attenuation control only in acertain range, if the attenuation is too large, also could not see the objectsother than laser thought. As a result, the traditional laser protective gogglesfor protection of the eyes and ability is limited. The deficiency oftraditional laser protective glasses, can not really separated, the laser withthe human eyes and protective role is very limited. Such as to achieve a kindof laser is separated from the human eye laser protection tools, not only willbe completely ruled out the possibility of injury to the human eye laser, andis effective and convenient to carry out research and production of laserapplication.
Today, imaging, photoelectric detection,digital signal processing and electro-
optical display technology, has reachedan unprecedented level, thus developed a portable and low cost, and human eyesfrom the laser truly the new concept of laser protective glasses has becomepossible. The structure of the new laser protective glasses is our structureschematic drawing of the new type of laser protective glasses, order from rightto left, after natural light collected by the lens converge imaging on thelight-sensitive chips, photosensitive chip digital image signal can beconverted to electrical signals, the signal by digital chip micro display inputafter high speed processing, again into micro image, finally by the eyepiecewill image after image magnification in the human eye. For the focal lengthvariable among them, the lens, light sensitive chip USES is CMOS chip. AlthoughCMOS in terms of sensitivity, resolution and signal-to-noise ratio than theCCD, but for ordinary visual application has enough here, and CMOS itself alsohas a certain advantage.
Firstof all, it is the direct digital signal output, and mathematics cohesion isadvantageous for the highly integrated chip; Secondly because of imageacquisition in a different way, power consumption of CMOS only 1/3 of the CCD;Cost is far lower than the cost of CCD and CMOS. Photoelectric signalprocessing part (i.e. motherboard part) adopts mainly by DSP and FPGA chip, isused to control the CMOS capture images, and its output signal imaging in microdisplay after processing.
This part connected with a control handle(used to provide a battery power and external receiving control instruction),the FPGA to accept instructions from the control handle can control the CMOSparameters such as exposure time, DSP control of image signal, such as brightness,contrast and color temperature (i.e., the intensity of red, green, blue threechannels) and so on, in addition, you can also control the lens focaladjustment automatically. Micro display is used in OLED display, due to thelimitation of volume and its accuracy, superfine OLED current high resolutionis not doing enough, this is a technical bottleneck in the development of thecomponents, but along with the advance of technology, higher resolution andmore clear superfine OLED will emerge. At present the main resolution is 640480. Is the role of the eyepiece tiny image to zoom in on the display, makeshown above with the real objects, object with similar imaging in the visualperception of the human eye as much as possible.
Its focal length can do proper adjustment,in order to suit different vision of the eye, so even if myope can also wearthe protective goggles, directly without having to wear myopia glasses. Thelaser protective glasses has adopted almost completely different with thetraditional laser protective goggles design concept, therefore, to realize thereal isolation of the human eye and the laser, played a very safe protectionfor your eyes, its unique digital function also provides great convenience forpeople to adjust the laser. Beijing one optimal photoelectric technology co.,LTD. Introduction to the use of this new type of laser protection lens,originally it is dangerous to laser will become small, that is to say in thelaser in the laboratory is very essential protections.
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