Glass can be used at building and art not only, still can use at medical treatment and instrument. Do not have different character with phyletic glass, when using, must notice. So, what do vitreous lens and colophony lens have to distinguish?
One, vitreous lens and colophony lens distinction
The thermal conductivity of optical glass is better than colophony, feel cooler also. Optical glass is a bit heavier than colophony. If can see an eye grind an edge, grinding an edge is the colophony of the glass that wears arenaceous face and lens face commonly.
Lens, also call lens the heart, it is a picture heart that sets draw a frame round, suit to be placed in frame, call lens the heart so. Its form can be a level is OK also it is perpendicular, installation goes to the lavatory simply.
The main raw material of optical glass lens is optical glass. Its refractive index is higher than colophony lens, lens of coequal degree glass is so thinner than colophony lens. Optical glass lens has good light transmittance and mechanical and chemical property, refractive index is constant, physico-chemical performance is steady. The camera lens that does not have color calls optics to be held in the palm in vain (white piece) , the pink in colour film piece call Croker lens (red a) . Croker lens can absorb ultraviolet radiation, slight absorb strong light.
Colophony is one kind comes from a variety of plants, especially Song Bai kind excretive a kind of hydrocarbon. As a result of its special chemical structure, can use as emulsioni paint and adhesive. It is the mixture of all sorts of high polymer compound, because this has different melting point. Colophony can be divided for natural colophony and synthetic resin. Colophony sort is various, apply extensively at the light industry of people and heavy industry, often also can see in daily life, wait like glasses of plastic, colophony, coating. Colophony lens is it is raw material with colophony, machine complex lens through chemistry.
2, the composition of optical glass lens
Optical glass is to use tall purity silicon, boracic, natrium, Potassium, zinc, lead, magnesian, calcic, barium the oxide that wait mixes by specific recipe, in platinic crucible high temperature melts, with ultrasonic agitate even, go bleb; Next via dropping in temperature adagio for long, lest vitreous piece produces internal stress. The glass after refrigeration piece, must measure through telescope, examine whether do purity, diaphaneity, uniformity, refractive index and chromatic dispersion rate add up to norms. Eligible glass piece the course heats v, into embryo of optical lens wool.
