1.8 Innovations

A compact and as thinner as possible form factor is the mainstream of designing current laptops. That causes traditional round-shape speakers which are limited by the diameter (i.e. length and width) are not able to satisfy with state-of-the-art laptops. So almost all loudspeakers design for laptops have rectangular shape to enlarge the vibrating area under a compact and limited space, and the dimension of longer with narrower and thinner is the direction for the developments in the future. The side effects of the rectangular speakers which have high ratio of length by width are that some components increase the costs and even cannot be manufactured if the ratio reaches too high. For instance, two and multiple motors (voice coils) designs increase the costs because the longer coil can't be manufactured in a reasonable yield rate. There is a solution to deal with current laptop speakers. The voice coil which is made by FPC (Flexible Printed Circuit) has fewer limitations for the speakers which have high ratio of length by width. The speaker which has a FPC voice coil should be designed with a proper magnetic circuit and structure; it's easy to develop the relatively longer and narrower loudspeakers which are rectangular shapes.

The currently traditional two-motors (voice coils) design for laptop and tablet's speakers.

The architecture of the speaker which is designed with a FPC (Flexible Printed Circuit) voice coil is easy to develop the rectangular shape with as narrower as possible.

Building the simulation model to see how does it work and sound like.

The simulated frequency response and impedance curve of the speaker which has a dimension of length 50 millimeters, width 4.5 millimeters and height 12 millimeters is integrated with a five-cubic-centimeter closed box at the conditions of one watt driving power and 0.5 meters receiving distance.