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Bifocal lens is mostly used for xenon headlights that share one light source for near and far beams. There is a shading plate in the lens, and the far and near beams are realized by moving the shading plate up and down. In this way, only one xenon bulb is needed to switch between near and high beams.
The development and application of this technology has realized the change and use of car lighting effects, and improved the convenience and convenience of car driving at night.
Bifocal lens or single vision lens cannot be judged by the number of lenses (the simple identification method is to see whether the lens has a dimming solenoid valve, the solenoid valve is double light, otherwise it is single light) The details are as follows: Among the lamps, the light shape of the lens cap is the most standard, which can have obvious light and dark cutting lines, which solves the problem of astigmatism. In foreign countries, xenon lamps are used as standard lenses. This kind of lens belongs to the category of optical lenses. Just call it "lens." Compared with headlamps with traditional lamp caps, the headlights with lens-type lamp caps have the advantages of uniform brightness, strong penetrating power, and less light loss.
There are two types of lens lamp holders equipped with vehicles: single light and double light. When the high beam is turned on, it operates the dimming shutter through the electromagnetic mechanism, so that the light of the low beam is also allocated to the high beam, which means that there are two high beams bright together. Bifocal lenses are generally used in middle and high-end cars.
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