Pourquoi l’optique plastique ou Ploymer?

WHY PLASTIC OPTICS?

There are many reasons why product designers decide to use .plastic optics essentially fall into two categories: relative low cost and the opportunity to use unique element configuration.

Plastic optics have a number of advantages over glass. Foremost of these are lower cost, higher impact resistance, lighter weight and more configuration possibilities for simplifying system assembly. Configuration flexibility is especially useful in systems that can use aspherical lenses to simplify system design and reduce pats count, weight and cost. En outre, light transmittance is comparable to that of high-grade crown glasses. Finally, the plastics

that can break generally do not splinter like glass. The fragments are larger and tend to be more obtuse and less hazardous.

The chief disadvantages of plastic optics are comparative intolerance to severe temperature fluctuation in some systems and low resistance to scratching. These disadvantages,

however, are far outweighed by the advantages plastic brings to the majority of optical applications. Although plastic has less temperature tolerance than glass,most optical systems do not operate in ambient, temperatures beyond the thermal limits of plastic elements. For

that matter, glass optical systems often will not withstand much more physical abuse than their plastic counterparts and still function properly.

The variety of available glass optical raw materials is much greater than that for plastic. This abundance of glass options translates to greater design freedom because of the

wide selection of dispersions and indices of refraction.However, creative use of plastic aspherics often compensates for the narrower choice of materials.

Low Cost: The injection molding process, is ideal for producing large volumes of parts economically.

Multicavity molds allow a low-cost manufacturing process

Les éléments optiques moulés par injection sont formés dans des moules en acier qui contiennent des cavités usinées avec des surfaces polies à une qualité optique (Retour au début). La matière première fondue est forcée sous pression dans le moule à température contrôlée (fond). Après refroidissement, Les pièces sont retirées des portes et des glissières et ne nécessitent aucun processus de finition supplémentaire.

à combiner avec des matières premières relativement peu coûteuses pour créer un avantage économique puissant pour de grands volumes de production. En dimensionnant soigneusement le moule en fonction du volume de production requis, Le seuil de rentabilité, par rapport à l’alternative en verre, peut être étonnamment faible,

Montage intégral: The molding process permits mounting

and assembly features such as mounting brackets,

troué, fentes et brides à faire partie intégrante de l’élément optique.

The result is a single-piece design that eliminates

mounting hardware and simplifies assembly and alignment.

Les coûts d’assemblage sont souvent supérieurs à ceux de l’optique elle-même,

Les avantages de l’utilisation de configurations imaginatives sont donc évidents.

En outre, multiple elements can be combined in

unique optical configurations such as transceiver lenses for

transmitting and receiving simultaneously. Figures 1.3,

1.4, 1.5, 1.6 and 1.7 demonstrate special designs incorporating

both multiple elements and integral mounting.

Fig. 1.8 est un objectif multi-éléments avec une configuration spéciale des bords

qui aligne et centre les éléments; this design is

economically beneficial for high production volume applications.