By Michael P. Schaub
Many goods we use in our day-by-day lives-the site visitors signs, movement sensors, fingerprint readers, cellphone cameras, bar code scanners, and DVD players-rely upon plastic optical structures to accomplish. accordingly, there's a growing to be desire for many who are a professional within the layout, improvement, and construction of such structures.
This publication offers an summary of the layout of plastic optical structures and is established alongside the traces of a standard improvement venture. Following a short historical past dialogue, the benefits and downsides of plastic optics are thought of. subsequent, the to be had fabrics and their homes are defined, in addition to the problems of fabric choice and specification. numerous production tools are reviewed, by way of a bankruptcy on layout guidance, major into numerous layout examples. Following the examples, the prototyping and trying out of a layout is roofed. eventually, bringing the layout to construction is mentioned.
a number of teams will enjoy the fabric offered, together with optical engineers, technical managers, and engineers of alternative disciplines who have to layout and increase plastic optical platforms yet lack the information or education to take action.
With the aid of this booklet, readers should still comprehend the advantages and boundaries of plastic optical platforms and have the capacity to ensure if this know-how is acceptable for his or her functions. they are going to have the fundamental wisdom to adopt the layout of those platforms, may still they decide to accomplish that themselves, or they are going to be capable of have the precise conversations with the contributors or businesses they ask to accomplish the paintings.
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Additional resources for The Design of Plastic Optical Systems
There have been attempts to model the shrinkage of the element prior to the casting and create the proper mold accordingly. 49 Another method of hardening the liquid is to irradiate it with ultraviolet light. Certain casting materials respond quickly to this method. In fact, some materials that are used in UV-cure casting are also used as UV-cure adhesives. In (eyeglass) optician’s shops, it is becoming increasingly common for spectacle lenses to be cast using a UV-cure system. Prior to this, the shops often finished the lenses by putting the correct prescription on the rear surface of a precast lens blank.
The crowns are materials that Optical Plastics 19 have an Abbe number over about 50, and the flints are materials with Abbe numbers less than about 50. This naming convention allows for easy description of the configuration of a design. For example, a two-element system may be described as having a negative flint lens followed by a positive crown lens. In addition to being divided into crowns and flints, optical plastics are also divided into two groups based on their ability (or not) to be repeatedly heated and formed.
Different grades of a given material may have different service temperatures. For instance, several grades of the COC materials have lower service temperatures than shown, actually near or less than the value for polycarbonate. As discussed in the previous chapter, thermal issues are one of the potential downfalls of plastic optics. Selection of the appropriate material for an application can determine the success or failure of a project. Consider, for instance, the ubiquitous cell phone camera.
The Design of Plastic Optical Systems by Michael P. Schaub