Generally, the first impression anyone has of an electronic instrument is the casing or the electronic enclosure of the device. In fact, in appliances such as calculators, electronic watches, cash registers, remote control units, etc. the look and the feel of the items is generally very important. So to put it simply, the electronic closure or instrument closure as it is also known is more or less the housing unit of the electrical device.
Electronic enclosures come in various types such as rectangular, t-shape, readout and slanted. Rectangular enclosures are mainly rectangular in shape with the top and bottom surfaces parallel to each other and the sides of the enclosure may be angled. Slanted enclosures are typically rectangular in shape as well with the top surface angled relative to bottom surface. T-shaped enclosures are usually used in handheld instruments as the handle, or lower portion of the enclosure is narrower than the upper portion. A readout style of enclosure is another rectangular enclosure with a section of the top surface sloped, usually so it can house an electronic display. A cash register has this type of enclosure.
Electronic enclosures are made of a wide variety of material such as: stainless steel, aluminum, polystyrene, acrylonitrile-butadiene-styrene, polycarbonate, etc. While steel is corrosion resistant and can withstand blows to the frame, aluminum is a lighter material. The plastic electronic enclosures usually offer optimum impact resistance and have good optical characteristics. They are also quite popular as they and can be manufactured in different colors.
An electronic closure needs to be sturdily built as it has to protect the electronic components of the device that it is housing. If you drop your device on the floor, spill liquid in it or overheat it, then you may do permanent damage to the circuitry inside of the unit.
While specifying an electronic enclosure, you must mention the internal and external size, cover and assembly style as well as the flap and hinge cover that you require, etc. You also need to specify if the enclosure should be flame retardant and provide resistance against EMI or RF interference, etc.