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What should be paid attention to when processing PC lenses in the garage?

2019-08-26
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Suction cup: the process of setting suction cup on PC lens for edge grinding is the same as that of other materials. Avoid sucking on the lens for more than one hour, because the contact time between the sucker and the surface layer of the lens is too long, which will damage the film. Generally, it is customary to put a small suction cup in the optical center of the lens. When the width (a value) of the PC lens to be processed is much larger than the height (b value), such as rectangle or oblate ellipse, and the pupil distance requires shifting the optical center, it is recommended to hit the suction cup at the geometric center of the lens. In this way, the lens deformation in the process of edge grinding caused by excessive asymmetry can be avoided, which will cause trouble for lens mounting.

Edge grinding: if the edge grinding wheel (or knife) is kept sharp, most typical edge grinding equipment can cut out satisfactory PC lenses. In the rough grinding stage, dry grinding should be carried out to avoid the use of coolant (water), while in the fine grinding or polishing stage, wet grinding can be carried out, because the heat generated is the smallest, and the knife dry cutting method is more suitable for the edge grinding of PC lenses. But most of the edgers on the market are wheel type. The rough grinding wheel designed for PC lens on this kind of wheel edging machine also fully meets the requirements, but the grinding speed in the wet grinding stage must not be too fast. The grinding chamber shall be kept clean. If any debris is found on the diamond wheel, it can be removed with glass or bamboo chopsticks. If there is a large amount of debris around the lens during grinding, it can be removed by hand to facilitate grinding and avoid damage to the lens. In addition, the edger needs to be cleaned regularly and kept clean.

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When grinding, PC lenses do not produce as much dust as resin lenses. If a general coarse filter screen or mosquito net cloth is installed at the end of the downpipe of the grinding machine to filter the dust generated during grinding, the method of circulating water can be used to save water cost. If the manual or semi-automatic edging machine without PC lens process setting is adopted, the water shall be cut off manually and dry grinding shall be carried out in rough grinding stage. But in the last 1 to 2 turns of fine grinding, the water source can be turned on to add water for fine grinding, which can make the edge of the lens brighter.

As far as possible, modern full-automatic edging machines are used, because these edging systems are equipped with edging procedures specially designed for PC lenses and AR or ultra waterproof membrane lenses. Now some high-end automatic edging machines are equipped with CR-39 / poly diamond wheel. It is recommended to use surface protective tape before the edge grinding of suction cup on AR, especially on ultra waterproof membrane lens. The utility model can prevent scratching, prevent the lens from sliding when grinding, and reduce the excessive pressure brought by the suction cup to the anti film lens when grinding. If the pressure of the suction cup is too high, the lens will bend during edge grinding, which will cause the film of the lens to crack. Make sure the surface of the lens is clean before pasting the protective tape.


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