Download The Design of Plastic Optical Systems by Michael P. Schaub PDF
By Michael P. Schaub
Many goods we use in our day-by-day lives-the site visitors indications, movement sensors, fingerprint readers, mobile phone cameras, bar code scanners, and DVD players-rely upon plastic optical platforms to accomplish. for that reason, there's a becoming desire for many who are a professional within the layout, improvement, and construction of such platforms.
This booklet offers an summary of the layout of plastic optical platforms and is based alongside the traces of a regular improvement venture. Following a quick historical past dialogue, the benefits and drawbacks of plastic optics are thought of. subsequent, the to be had fabrics and their houses are defined, in addition to the problems of fabric choice and specification. quite a few production tools are reviewed, by way of a bankruptcy on layout instructions, top into a number of layout examples. Following the examples, the prototyping and checking out of a layout is roofed. ultimately, bringing the layout to construction is mentioned.
numerous teams will enjoy the fabric offered, together with optical engineers, technical managers, and engineers of alternative disciplines who have to layout and enhance plastic optical structures yet lack the data or education to take action.
With assistance from this ebook, readers may still comprehend the advantages and obstacles of plastic optical structures and be capable of make sure if this expertise is acceptable for his or her purposes. they'll have the fundamental wisdom to adopt the layout of those structures, should still they decide to achieve this themselves, or they are going to be in a position to have the precise conversations with the participants or businesses they ask to accomplish the paintings.
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Additional resources for The Design of Plastic Optical Systems
Sample text
08-cm focal length acrylic and N-BK7 lenses used for weight comparisons, we now compare the effect of a temperature change, going from 20 °C to 70 °C. We assume that both of the lenses are mounted on their planar (rear) surface. 1 × 10–6 per °C. 1 × 10–6 per °C. 000355, or about 10 times less. 000155. Note that in addition to being about 34 times greater than the N-BK7 refractive index change, the change in index of the acrylic lens also has the opposite sign. With increasing temperature, the refractive index of the glass lens goes up, while that of the plastic lens goes down.
Of course, rays can also go from a higher-index material to a lower-index material, as when they are leaving the rear surface of a lens. Again, the angle of refraction will depend upon the angle of incidence and the refractive indices of the materials on either side of the boundary. The larger the ratio of the refractive indices (higher index to lower index), the more the ray will be refracted. When attempting to go from a higher-index material to a lower-index material, it is possible for the ray not to cross the boundary but to be reflected back into the higher-index material.
002/cm2). 51 Compression molding is similar in many ways to embossing. Both methods are typically used to impart a surface-relief structure to a part. In the case of compression molding, the structures are usually larger and deeper than those used with embossing. An example of this would be Fresnel lenses, where the steps of the lens are much deeper than the diffractive steps normally seen in embossing. Compression molding is normally performed in a vertical orientation. A compression mold is built, which contains the masters of the features that are to be replicated.